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▄▀▄ ▄▀▀▀▀▄ ▀ ▄▄▀▀▀▀▀▀▄ ▀ ▀ ▀▀▀▀▀▀▀▄▀▄ ▄▄ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀ ▄▀▄ ▀▀▄ ▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▄ ▀▀▀ ▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄ ▀▀▀▀ ▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▄▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▄▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀ ▄▀▀▀▀▀▀▀▄▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▄▄▄▄▄▄▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▄▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▄▄ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀ ▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▄▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀ ▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▄▀▀▀ ▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▄▀▀ ▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▄▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀ ▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▄▀▀ ▀▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀ ▄▀▀▀▀▀▀▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▄ ▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▄▀▄ ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀ ▄▄▄▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▄▀▀▀▀▄

╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ 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│ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ 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╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─╮ │http│ ssh │ │ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─╯

1321 } 1322 1323 // serve an attachment's bytes from the repo its url names 1324 fn serveAttachment( 1325 io: std.Io, 1326 request: *std.http.Server.Request, 1327 allocator: std.mem.Allocator, 1328 attachment: AttachmentRequest, 1329 host: Host, 1330 ) !void { 1331 if (!try mayRead(io, allocator, request, host, attachment.repo_base)) return respondAttachmentNotFound(request); 1332 const request_repo = (try requestRepoSource(io, allocator, host, attachment.repo_base)) orelse return respondAttachmentNotFound(request); 1333 defer request_repo.deinit(allocator); 1334 const source = request_repo.source; 1335 switch (source.repo_kind) { 1336 inline else => |repo_kind| { 1337 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1338 defer any_repo.deinit(io, allocator); 1339 switch (any_repo) { 1340 inline else => |*repo| try sendAttachment(repo_kind, repo.self_repo_opts, io, request, allocator, repo, &attachment.id), 1341 } 1342 }, 1343 } 1344 } 1345 1346 fn sendAttachment( 1347 comptime repo_kind: rp.RepoKind, 1348 comptime repo_opts: rp.RepoOpts(repo_kind), 1349 io: std.Io, 1350 request: *std.http.Server.Request, 1351 allocator: std.mem.Allocator, 1352 repo: *rp.Repo(repo_kind, repo_opts), 1353 id: *const [evt.event_id_size]u8, 1354 ) !void { 1355 var arena = std.heap.ArenaAllocator.init(allocator); 1356 defer arena.deinit(); 1357 1358 const DB = evt.EventDB(repo_opts.hash); 1359 var event_db_maybe: ?evt.LocalEventDB(repo_opts.hash) = if (repo_kind == .git) try evt.LocalEventDB(repo_opts.hash).openReadOnly(io, allocator, repo.core.repo_dir) else null; 1360 defer if (event_db_maybe) |*event_db| event_db.deinit(io, allocator); 1361 const haxy_moment = (if (event_db_maybe) |*event_db| 1362 evt.currentMomentFromDb(repo_opts.hash, event_db.db) 1363 else if (repo_kind == .git) 1364 return respondAttachmentNotFound(request) 1365 else 1366 evt.currentMoment(repo_opts, repo)) catch return respondAttachmentNotFound(request); 1367 1368 const record = (try evt.Attachment.readById(DB, repo_opts.hash, haxy_moment, &arena, id)) orelse return respondAttachmentNotFound(request); 1369 if (record.removed) return respondAttachmentNotFound(request); 1370 if (record.blob_oid.len != hash.hexLen(repo_opts.hash)) return respondAttachmentNotFound(request); 1371 const blob_oid: *const [hash.hexLen(repo_opts.hash)]u8 = @ptrCast(record.blob_oid.ptr); 1372 1373 var moment = repo.core.latestMoment() catch return respondAttachmentNotFound(request); 1374 const state = rp.Repo(repo_kind, repo_opts).State(.read_only){ .core = &repo.core, .extra = .{ .moment = &moment } }; 1375 var object_reader = obj.ObjectReader(repo_kind, repo_opts).init(state, io, allocator, blob_oid) catch return respondAttachmentNotFound(request); 1376 defer object_reader.deinit(); 1377 if (object_reader.header().kind != .blob) return respondAttachmentNotFound(request); 1378 1379 const content_type = attachmentContentType(record.name); 1380 const encoded_name = try ui.urlEncodeRef(allocator, record.name); 1381 defer allocator.free(encoded_name); 1382 const disposition = try allocator.print("{s}; filename*=UTF-8''{s}", .{ if (content_type == null) "attachment" else "inline", encoded_name }); 1383 defer allocator.free(disposition); 1384 1385 var send_buf: [8192]u8 = undefined; 1386 var body = try request.respondStreaming(&send_buf, .{ 1387 .content_length = object_reader.header().size, 1388 .respond_options = .{ 1389 .extra_headers = &.{ 1390 .{ .name = "content-type", .value = content_type orelse "application/octet-stream" }, 1391 .{ .name = "content-disposition", .value = disposition }, 1392 // uploaded bytes are never sniffed into a type that could run 1393 // as script on this origin 1394 .{ .name = "x-content-type-options", .value = "nosniff" }, 1395 }, 1396 }, 1397 }); 1398 _ = try object_reader.interface.streamRemaining(&body.writer); 1399 try body.end(); 1400 } 1401 1402 // the images a browser renders safely inline. anything else downloads as 1403 // opaque bytes, so an uploaded page can't run on this origin. 1404 fn attachmentContentType(name: []const u8) ?[]const u8 { 1405 const types = [_]struct { ext: []const u8, value: []const u8 }{ 1406 .{ .ext = ".png", .value = "image/png" }, 1407 .{ .ext = ".jpg", .value = "image/jpeg" }, 1408 .{ .ext = ".jpeg", .value = "image/jpeg" }, 1409 .{ .ext = ".gif", .value = "image/gif" }, 1410 .{ .ext = ".webp", .value = "image/webp" }, 1411 }; 1412 for (types) |entry| { 1413 if (name.len > entry.ext.len and std.ascii.eqlIgnoreCase(name[name.len - entry.ext.len ..], entry.ext)) return entry.value; 1414 } 1415 return null; 1416 } 1417 1418 fn respondAttachmentNotFound(request: *std.http.Server.Request) !void { 1419 try request.respond("attachment not found", .{ 1420 .status = .not_found, 1421 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1422 }); 1423 } 1424 1425 fn respondAttachmentTargetNotFound(request: *std.http.Server.Request) !void { 1426 try request.respond("attachment target not found", .{ 1427 .status = .not_found, 1428 .keep_alive = false, 1429 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1430 }); 1431 } 1432 1433 // the upload declares its file's name here, since the body is the file itself 1434 const attachment_name_header = "x-attachment-name"; 1435 1436 const AttachTargetParts = struct { 1437 repo_base: []const u8, 1438 kind: evt.EventKind, 1439 id_bytes: [evt.event_id_size]u8, 1440 }; 1441 1442 // what an attachment hangs off: the `<kind>:<id>` segment the form's page ends 1443 // with, whatever kind that is 1444 fn attachTargetParts(base: []const u8) ?AttachTargetParts { 1445 const segment_at = std.mem.lastIndexOfScalar(u8, base, '/') orelse return null; 1446 const segment = base[segment_at + 1 ..]; 1447 const colon_at = std.mem.lastIndexOfScalar(u8, segment, ':') orelse return null; 1448 const kind = std.meta.stringToEnum(evt.EventKind, segment[0..colon_at]) orelse return null; 1449 const id_bytes = evt.parseEventId(segment[colon_at + 1 ..]) catch return null; 1450 return .{ .repo_base = base[0..segment_at], .kind = kind, .id_bytes = id_bytes }; 1451 } 1452 1453 // attach the uploaded file to the event the url names, then reload. the file is 1454 // the whole request body, so it streams from the socket into the object store 1455 // without being buffered. 1456 fn handleAttach( 1457 io: std.Io, 1458 request: *std.http.Server.Request, 1459 allocator: std.mem.Allocator, 1460 base: []const u8, 1461 host: Host, 1462 ) !void { 1463 const parts = attachTargetParts(base) orelse return respondAttachmentTargetNotFound(request); 1464 1465 var author_arena = std.heap.ArenaAllocator.init(allocator); 1466 defer author_arena.deinit(); 1467 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read, parts.kind)) orelse return; 1468 const author = actor.author; 1469 // an attachment changes the event it hangs off 1470 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondAttachmentTargetNotFound(request); 1471 defer request_repo.deinit(allocator); 1472 const source = request_repo.source; 1473 if (!try source.canModify(io, allocator, actor, parts.kind, &parts.id_bytes)) return respondForbidden(request); 1474 1475 const name = (try attachmentName(allocator, request)) orelse return respondUploadError(request, .bad_request, "attachment needs a name"); 1476 defer allocator.free(name); 1477 if (!evt.Attachment.nameValid(name)) return respondUploadError(request, .bad_request, "invalid attachment name"); 1478 1479 const size = request.head.content_length orelse return respondUploadError(request, .length_required, "attachments must declare a content length"); 1480 if (size == 0) return respondUploadError(request, .bad_request, "attachment is empty"); 1481 if (size > evt.Attachment.max_size) return respondUploadError(request, .payload_too_large, "attachment is too large"); 1482 1483 const target_id_hex = std.fmt.bytesToHex(parts.id_bytes, .lower); 1484 1485 var body_buf: [4096]u8 = undefined; 1486 const blob: evt.Blob = .{ .name = name, .size = size, .reader = try request.readerExpectContinue(&body_buf) }; 1487 1488 switch (source.repo_kind) { 1489 inline else => |repo_kind| { 1490 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1491 defer any_repo.deinit(io, allocator); 1492 switch (any_repo) { 1493 inline else => |*repo| _ = evt.Attachment.create(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, parts.kind, &target_id_hex, blob, author) catch |err| switch (err) { 1494 error.TargetNotFound => return respondAttachmentTargetNotFound(request), 1495 else => return err, 1496 }, 1497 } 1498 }, 1499 } 1500 1501 // the client reloads the page itself 1502 try request.respond("", .{ .status = .no_content, .keep_alive = false }); 1503 } 1504 1505 // assign the posted email, or the email of the user it names, to the thread the 1506 // url names, then reload it 1507 fn handleAssign( 1508 io: std.Io, 1509 request: *std.http.Server.Request, 1510 allocator: std.mem.Allocator, 1511 base: []const u8, 1512 host: Host, 1513 ) !void { 1514 const parts = commentBaseParts(host, base) orelse return respondRemoveNotFound(request); 1515 if (parts.comment_id != null) return respondRemoveNotFound(request); 1516 1517 var arena = std.heap.ArenaAllocator.init(allocator); 1518 defer arena.deinit(); 1519 const actor = (try authorizeWrite(io, allocator, &arena, request, host, parts.repo_base, .read, parts.thread_kind)) orelse return; 1520 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1521 defer request_repo.deinit(allocator); 1522 const source = request_repo.source; 1523 if (!try source.canModify(io, allocator, actor, parts.thread_kind, &parts.thread_id)) return respondForbidden(request); 1524 1525 const text = blk: { 1526 const body = try readFormBody(request, allocator); 1527 defer allocator.free(body); 1528 break :blk (try parseFormField(arena.allocator(), body, "assignee")) orelse ""; 1529 }; 1530 const failure: ?ui.Session.FormFeedback.AssignmentFailure = blk: { 1531 const lookup = switch (host) { 1532 .local => try ui.assigneeEmail(null, &arena, text), 1533 .server => |server| server: { 1534 var admin_repo = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 1535 defer admin_repo.deinit(io, allocator); 1536 break :server try ui.assigneeEmail(try evt.currentMoment(evt.admin_repo_opts, &admin_repo), &arena, text); 1537 }, 1538 }; 1539 const email = switch (lookup) { 1540 .email => |email| email, 1541 .failure => |value| break :blk value, 1542 }; 1543 const thread_id_hex = std.fmt.bytesToHex(parts.thread_id, .lower); 1544 switch (source.repo_kind) { 1545 inline else => |repo_kind| { 1546 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1547 defer any_repo.deinit(io, allocator); 1548 switch (any_repo) { 1549 inline else => |*repo| _ = evt.Assignment.create(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, parts.thread_kind, &thread_id_hex, email, actor.author) catch |err| switch (err) { 1550 error.AlreadyAssigned => break :blk .already_assigned, 1551 error.InvalidFields => break :blk .not_an_email, 1552 error.NotFound => return respondRemoveNotFound(request), 1553 else => |e| return e, 1554 }, 1555 } 1556 }, 1557 } 1558 break :blk null; 1559 }; 1560 if (failure) |value| return respondThreadFormFailure(request, allocator, host, base, .{ .assignment = .{ .failure = value, .text = text } }); 1561 try request.respond("", .{ .status = .see_other, .keep_alive = false, .extra_headers = &.{.{ .name = "location", .value = base }} }); 1562 } 1563 1564 // unassign the email the url's last segment carries from the thread before it, 1565 // then reload the thread 1566 fn handleUnassign( 1567 io: std.Io, 1568 request: *std.http.Server.Request, 1569 allocator: std.mem.Allocator, 1570 base: []const u8, 1571 host: Host, 1572 ) !void { 1573 const infix = "/assignee:"; 1574 const at = std.mem.lastIndexOf(u8, base, infix) orelse return respondRemoveNotFound(request); 1575 const thread_url = base[0..at]; 1576 const parts = commentBaseParts(host, thread_url) orelse return respondRemoveNotFound(request); 1577 if (parts.comment_id != null) return respondRemoveNotFound(request); 1578 1579 var arena = std.heap.ArenaAllocator.init(allocator); 1580 defer arena.deinit(); 1581 const email = std.Uri.percentDecodeInPlace(try arena.allocator().dupe(u8, base[at + infix.len ..])); 1582 const actor = (try authorizeWrite(io, allocator, &arena, request, host, parts.repo_base, .read, parts.thread_kind)) orelse return; 1583 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1584 defer request_repo.deinit(allocator); 1585 const source = request_repo.source; 1586 if (!try source.canModify(io, allocator, actor, parts.thread_kind, &parts.thread_id)) return respondForbidden(request); 1587 1588 switch (source.repo_kind) { 1589 inline else => |repo_kind| { 1590 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1591 defer any_repo.deinit(io, allocator); 1592 switch (any_repo) { 1593 inline else => |*repo| evt.removeInThread(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, parts.thread_kind, &parts.thread_id, .assign, &evt.Assignment.idOf(&parts.thread_id, email), actor.author) catch |err| switch (err) { 1594 error.EventNotFound => return respondRemoveNotFound(request), 1595 else => |e| return e, 1596 }, 1597 } 1598 }, 1599 } 1600 try request.respond("", .{ .status = .see_other, .keep_alive = false, .extra_headers = &.{.{ .name = "location", .value = thread_url }} }); 1601 } 1602 1603 // subscribe the logged-in user to the thread the url names, or mute it, then reload it 1604 fn handleNotify( 1605 io: std.Io, 1606 request: *std.http.Server.Request, 1607 allocator: std.mem.Allocator, 1608 base: []const u8, 1609 host: Host, 1610 users_dir: []const u8, 1611 mode: ui.NotifyAction, 1612 ) !void { 1613 const parts = commentBaseParts(host, base) orelse return respondRemoveNotFound(request); 1614 if (parts.comment_id != null) return respondRemoveNotFound(request); 1615 1616 var arena = std.heap.ArenaAllocator.init(allocator); 1617 defer arena.deinit(); 1618 const actor = (try authorizeWrite(io, allocator, &arena, request, host, parts.repo_base, .read, null)) orelse return; 1619 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1620 defer request_repo.deinit(allocator); 1621 // a server actor always has both ids 1622 const user_id = actor.user_id orelse unreachable; 1623 const location: evt.RepoLocation = .{ 1624 .owner_id = actor.repo_user_id orelse unreachable, 1625 .repo_id = evt.parseEventId(std.Io.Dir.path.basename(request_repo.source.path)) catch return respondRemoveNotFound(request), 1626 }; 1627 1628 switch (mode) { 1629 .subscribe => try notify.subscribe(io, allocator, users_dir, &user_id, location, &parts.thread_id, actor.author), 1630 .mute => try notify.mute(io, allocator, users_dir, &user_id, location, &parts.thread_id, actor.author), 1631 } 1632 try request.respond("", .{ .status = .see_other, .keep_alive = false, .extra_headers = &.{.{ .name = "location", .value = base }} }); 1633 } 1634 1635 // the name the upload declares for its file, percent-encoded so it survives a 1636 // header 1637 fn attachmentName(allocator: std.mem.Allocator, request: *std.http.Server.Request) !?[]u8 { 1638 var iter = request.iterateHeaders(); 1639 while (iter.next()) |header| { 1640 if (!std.ascii.eqlIgnoreCase(header.name, attachment_name_header)) continue; 1641 return try decodeFormValue(allocator, header.value); 1642 } 1643 return null; 1644 } 1645 1646 // an upload that failed leaves the body partly read, so the connection closes 1647 fn respondUploadError(request: *std.http.Server.Request, status: std.http.Status, message: []const u8) !void { 1648 try request.respond(message, .{ 1649 .status = status, 1650 .keep_alive = false, 1651 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1652 }); 1653 } 1654 1655 // re-emit the comment `parts` names with a new body, in the repo the host 1656 // resolves the base to. 1657 fn updateComment( 1658 io: std.Io, 1659 allocator: std.mem.Allocator, 1660 host: Host, 1661 parts: CommentBaseParts, 1662 body: []const u8, 1663 author: evt.CommitAuthor, 1664 ) !void { 1665 const comment_id = parts.comment_id orelse return error.NotFound; 1666 const thread_id = std.fmt.bytesToHex(parts.thread_id, .lower); 1667 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return error.NotFound; 1668 defer request_repo.deinit(allocator); 1669 const source = request_repo.source; 1670 switch (source.repo_kind) { 1671 inline else => |repo_kind| { 1672 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1673 defer any_repo.deinit(io, allocator); 1674 switch (any_repo) { 1675 inline else => |*repo| try evt.Comment.update(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, parts.thread_kind, &thread_id, &comment_id, body, author), 1676 } 1677 }, 1678 } 1679 } 1680 1681 // edit actions share a suffix; the base identifies the event being edited. 1682 fn handleEdit( 1683 io: std.Io, 1684 request: *std.http.Server.Request, 1685 allocator: std.mem.Allocator, 1686 base: []const u8, 1687 host: Host, 1688 ) !void { 1689 const parts = commentBaseParts(host, base) orelse return respondRemoveNotFound(request); 1690 if (parts.comment_id != null) return handleCommentEdit(io, request, allocator, base, host, parts); 1691 return handleThreadEdit(io, request, allocator, base, host, parts); 1692 } 1693 1694 // replace the body of the comment the url names, then redirect to its 1695 // permalink. 1696 fn handleCommentEdit( 1697 io: std.Io, 1698 request: *std.http.Server.Request, 1699 allocator: std.mem.Allocator, 1700 base: []const u8, 1701 host: Host, 1702 parts: CommentBaseParts, 1703 ) !void { 1704 var author_arena = std.heap.ArenaAllocator.init(allocator); 1705 defer author_arena.deinit(); 1706 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read, parts.thread_kind)) orelse return; 1707 const author = actor.author; 1708 // edits only reach here for a comment 1709 const comment_id = parts.comment_id orelse unreachable; 1710 { 1711 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1712 defer request_repo.deinit(allocator); 1713 if (!try request_repo.source.canModify(io, allocator, actor, .comment, &comment_id)) return respondForbidden(request); 1714 } 1715 1716 const form_body = try readFormBody(request, allocator); 1717 defer allocator.free(form_body); 1718 const body_crlf = (try parseFormField(allocator, form_body, "body")) orelse try allocator.dupe(u8, ""); 1719 defer allocator.free(body_crlf); 1720 const body = try std.mem.replaceOwned(u8, allocator, body_crlf, "\r\n", "\n"); 1721 defer allocator.free(body); 1722 1723 if (!evt.Comment.fieldsValid(body)) { 1724 const form_location = try allocator.print("{s}/edit", .{base}); 1725 defer allocator.free(form_location); 1726 try request.respond("", .{ 1727 .status = .see_other, 1728 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 1729 }); 1730 return; 1731 } 1732 1733 const not_found = "comment not found"; 1734 updateComment(io, allocator, host, parts, body, author) catch |err| switch (err) { 1735 error.NotFound => { 1736 try request.respond(not_found, .{ 1737 .status = .not_found, 1738 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1739 }); 1740 return; 1741 }, 1742 else => |e| return e, 1743 }; 1744 1745 try request.respond("", .{ 1746 .status = .see_other, 1747 .extra_headers = &.{.{ .name = "location", .value = base }}, 1748 }); 1749 } 1750 1751 fn updateThread( 1752 comptime Event: type, 1753 io: std.Io, 1754 allocator: std.mem.Allocator, 1755 host: Host, 1756 repo_base: []const u8, 1757 id: *const [evt.event_id_size]u8, 1758 update: Event.Update, 1759 author: evt.CommitAuthor, 1760 ) !void { 1761 const request_repo = (try requestRepoSource(io, allocator, host, repo_base)) orelse return error.NotFound; 1762 defer request_repo.deinit(allocator); 1763 const source = request_repo.source; 1764 switch (source.repo_kind) { 1765 inline else => |repo_kind| { 1766 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1767 defer any_repo.deinit(io, allocator); 1768 switch (any_repo) { 1769 inline else => |*repo| try Event.update(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, id, update, author), 1770 } 1771 }, 1772 } 1773 } 1774 1775 const RemoveParts = struct { 1776 repo_base: []const u8, 1777 kind: evt.EventKind, 1778 // the thread the removed event is, or belongs to 1779 thread_kind: evt.EventKind, 1780 thread_id: [evt.event_id_size]u8, 1781 id: [evt.event_id_size]u8, 1782 }; 1783 1784 // split a remove url into the repo and event it names 1785 fn removeParts(host: Host, base: []const u8) ?RemoveParts { 1786 if (attachmentRequest(base)) |attachment| { 1787 const target = attachTargetParts(attachment.repo_base) orelse return null; 1788 return .{ 1789 .repo_base = target.repo_base, 1790 .kind = .attach, 1791 .thread_kind = target.kind, 1792 .thread_id = target.id_bytes, 1793 .id = attachment.id, 1794 }; 1795 } 1796 if (commentBaseParts(host, base)) |thread| return .{ 1797 .repo_base = thread.repo_base, 1798 .kind = if (thread.comment_id != null) .comment else thread.thread_kind, 1799 .thread_kind = thread.thread_kind, 1800 .thread_id = thread.thread_id, 1801 .id = thread.comment_id orelse thread.thread_id, 1802 }; 1803 return null; 1804 } 1805 1806 // remove the event named by the form's url 1807 fn handleRemove( 1808 io: std.Io, 1809 request: *std.http.Server.Request, 1810 allocator: std.mem.Allocator, 1811 base: []const u8, 1812 host: Host, 1813 ) !void { 1814 const parts = removeParts(host, base) orelse return respondRemoveNotFound(request); 1815 1816 var author_arena = std.heap.ArenaAllocator.init(allocator); 1817 defer author_arena.deinit(); 1818 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read, parts.thread_kind)) orelse return; 1819 const author = actor.author; 1820 1821 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1822 defer request_repo.deinit(allocator); 1823 const source = request_repo.source; 1824 1825 if (parts.kind == .patch) switch (host) { 1826 .server => |server| { 1827 const user_id = actor.user_id orelse return respondLoginRequired(request); 1828 1829 // a draft lives in its author's user repo 1830 if (try evt.readForkById(io, allocator, &author_arena, server.users_dir, &user_id, &parts.id)) |fork_record| { 1831 const repo_id = evt.parseEventId(std.Io.Dir.path.basename(source.path)) catch return respondRemoveNotFound(request); 1832 if (!fork_record.removed and fork_record.event.stage == .draft and std.mem.eql(u8, &fork_record.event.repo_id, &std.fmt.bytesToHex(repo_id, .lower))) { 1833 const id = std.fmt.bytesToHex(parts.id, .lower); 1834 try fork.remove(io, allocator, server.users_dir, &user_id, &id, author); 1835 1836 const location = try allocator.print("{s}/patches/drafts", .{parts.repo_base}); 1837 defer allocator.free(location); 1838 try request.respond("", .{ 1839 .status = .see_other, 1840 .keep_alive = false, 1841 .extra_headers = &.{.{ .name = "location", .value = location }}, 1842 }); 1843 return; 1844 } 1845 } 1846 }, 1847 .local => {}, 1848 }; 1849 1850 // a draft is its author's alone, which its removal above checks 1851 if (!try source.canModify(io, allocator, actor, parts.kind, &parts.id)) return respondForbidden(request); 1852 1853 switch (source.repo_kind) { 1854 inline else => |repo_kind| { 1855 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1856 defer any_repo.deinit(io, allocator); 1857 switch (any_repo) { 1858 inline else => |*repo| evt.removeInThread(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, parts.thread_kind, &parts.thread_id, parts.kind, &parts.id, author) catch |err| switch (err) { 1859 error.EventNotFound => return respondRemoveNotFound(request), 1860 else => |e| return e, 1861 }, 1862 } 1863 }, 1864 } 1865 1866 const id = std.fmt.bytesToHex(parts.id, .lower); 1867 const location = try allocator.print("{s}/event:{s}/kind:{s}", .{ parts.repo_base, &id, @tagName(parts.kind) }); 1868 defer allocator.free(location); 1869 try request.respond("", .{ 1870 .status = .see_other, 1871 .keep_alive = false, 1872 .extra_headers = &.{.{ .name = "location", .value = location }}, 1873 }); 1874 } 1875 1876 fn respondRemoveNotFound(request: *std.http.Server.Request) !void { 1877 try request.respond("event not found", .{ 1878 .status = .not_found, 1879 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1880 }); 1881 } 1882 1883 fn updateDiscussion( 1884 io: std.Io, 1885 allocator: std.mem.Allocator, 1886 host: Host, 1887 repo_base: []const u8, 1888 id: *const [evt.event_id_size]u8, 1889 title: []const u8, 1890 labels: []const u8, 1891 description: []const u8, 1892 author: evt.CommitAuthor, 1893 ) !void { 1894 const request_repo = (try requestRepoSource(io, allocator, host, repo_base)) orelse return error.NotFound; 1895 defer request_repo.deinit(allocator); 1896 const source = request_repo.source; 1897 switch (source.repo_kind) { 1898 inline else => |repo_kind| { 1899 var any_repo = try rp.AnyRepo(repo_kind, .{}).open(io, allocator, source.localInitOpts()); 1900 defer any_repo.deinit(io, allocator); 1901 switch (any_repo) { 1902 inline else => |*repo| try evt.Discussion.update(host.event(), repo_kind, repo.self_repo_opts, io, allocator, repo, id, title, labels, description, author), 1903 } 1904 }, 1905 } 1906 } 1907 1908 // set the status of the issue the url names (base is 1909 // "/<owner>:<name>/issue:<id>", identity elided in local mode) by 1910 // re-emitting its event, then redirect back to it 1911 fn handleThreadStatus( 1912 io: std.Io, 1913 request: *std.http.Server.Request, 1914 allocator: std.mem.Allocator, 1915 base: []const u8, 1916 host: Host, 1917 open: bool, 1918 ) !void { 1919 const not_found = "thread not found"; 1920 const parts = commentBaseParts(host, base) orelse { 1921 try request.respond(not_found, .{ 1922 .status = .not_found, 1923 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1924 }); 1925 return; 1926 }; 1927 1928 var author_arena = std.heap.ArenaAllocator.init(allocator); 1929 defer author_arena.deinit(); 1930 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read, parts.thread_kind)) orelse return; 1931 const author = actor.author; 1932 { 1933 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 1934 defer request_repo.deinit(allocator); 1935 if (!try request_repo.source.canModify(io, allocator, actor, parts.thread_kind, &parts.thread_id)) return respondForbidden(request); 1936 } 1937 1938 (switch (parts.thread_kind) { 1939 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .status = if (open) .open else .closed }, author), 1940 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .status = if (open) .open else .closed }, author), 1941 else => return respondRemoveNotFound(request), 1942 }) catch |err| switch (err) { 1943 error.NotFound => { 1944 try request.respond(not_found, .{ 1945 .status = .not_found, 1946 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 1947 }); 1948 return; 1949 }, 1950 else => |e| return e, 1951 }; 1952 1953 // like logout, this is a bodyless POST, so close the connection rather than 1954 // letting the keep-alive path try to discard a body that isn't framed. 1955 try request.respond("", .{ 1956 .status = .see_other, 1957 .keep_alive = false, 1958 .extra_headers = &.{.{ .name = "location", .value = base }}, 1959 }); 1960 } 1961 1962 // replace a thread's editable fields. 1963 fn handleThreadEdit( 1964 io: std.Io, 1965 request: *std.http.Server.Request, 1966 allocator: std.mem.Allocator, 1967 base: []const u8, 1968 host: Host, 1969 parts: CommentBaseParts, 1970 ) !void { 1971 var author_arena = std.heap.ArenaAllocator.init(allocator); 1972 defer author_arena.deinit(); 1973 const actor = (try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .read, parts.thread_kind)) orelse return; 1974 const author = actor.author; 1975 1976 const body = try readFormBody(request, allocator); 1977 defer allocator.free(body); 1978 1979 const title = (try parseFormField(allocator, body, "title")) orelse try allocator.dupe(u8, ""); 1980 defer allocator.free(title); 1981 const labels = (try parseFormField(allocator, body, "labels")) orelse try allocator.dupe(u8, ""); 1982 defer allocator.free(labels); 1983 const description_crlf = (try parseFormField(allocator, body, "description")) orelse try allocator.dupe(u8, ""); 1984 defer allocator.free(description_crlf); 1985 // form submission normalizes textarea line breaks to CRLF; store plain 1986 // newlines so the text renders the same on every host 1987 const description = try std.mem.replaceOwned(u8, allocator, description_crlf, "\r\n", "\n"); 1988 defer allocator.free(description); 1989 const target_branch = (try parseFormField(allocator, body, "target_branch")) orelse try allocator.dupe(u8, ""); 1990 defer allocator.free(target_branch); 1991 1992 // invalid fields send the user back to the edit form 1993 const valid = switch (parts.thread_kind) { 1994 .issue => evt.Issue.fieldsValid(title, labels), 1995 .patch => evt.Patch.fieldsValid(title, labels), 1996 .discuss => evt.Discussion.fieldsValid(title, labels), 1997 else => unreachable, 1998 }; 1999 if (!valid) { 2000 const form_location = try allocator.print("{s}/edit", .{base}); 2001 defer allocator.free(form_location); 2002 if (!evt.titleValid(title)) { 2003 return respondThreadFormFailure(request, allocator, host, form_location, requiredTitleFeedback(parts.thread_kind, title, labels, description, target_branch, null)); 2004 } 2005 try request.respond("", .{ 2006 .status = .see_other, 2007 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 2008 }); 2009 return; 2010 } 2011 2012 const request_repo = (try requestRepoSource(io, allocator, host, parts.repo_base)) orelse return respondRemoveNotFound(request); 2013 defer request_repo.deinit(allocator); 2014 2015 const draft_user_id = if (parts.thread_kind == .patch) actor.user_id else null; 2016 if (draft_user_id) |user_id| { 2017 const server = switch (host) { 2018 .server => |server| server, 2019 .local => unreachable, 2020 }; 2021 if (!evt.Patch.branchValid(target_branch) or !try request_repo.source.hasBranch(io, allocator, target_branch)) { 2022 const form_location = try allocator.print("{s}/edit", .{base}); 2023 defer allocator.free(form_location); 2024 return respondThreadFormFailure(request, allocator, host, form_location, patchFeedback(.invalid_target_branch, title, labels, description, target_branch, null)); 2025 } 2026 const repo_id = evt.parseEventId(std.Io.Dir.path.basename(request_repo.source.path)) catch return respondRemoveNotFound(request); 2027 var admin_repo = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 2028 defer admin_repo.deinit(io, allocator); 2029 const id = std.fmt.bytesToHex(parts.thread_id, .lower); 2030 if (try pch.editDraft(.{}, io, allocator, server.users_dir, &admin_repo, .{ 2031 .id = id, 2032 .user_id = user_id, 2033 .repo_id = repo_id, 2034 .title = title, 2035 .labels = labels, 2036 .description = description, 2037 .target_branch = target_branch, 2038 .author = author, 2039 .timestamp = @intCast(std.Io.Timestamp.now(io, .real).toSeconds()), 2040 })) { 2041 try request.respond("", .{ 2042 .status = .see_other, 2043 .extra_headers = &.{.{ .name = "location", .value = base }}, 2044 }); 2045 return; 2046 } 2047 } 2048 2049 // a draft is its author's alone, which its edit above checks 2050 if (!try request_repo.source.canModify(io, allocator, actor, parts.thread_kind, &parts.thread_id)) return respondForbidden(request); 2051 2052 const not_found = switch (parts.thread_kind) { 2053 .issue => "issue not found", 2054 .patch => "patch not found", 2055 .discuss => "discussion not found", 2056 else => unreachable, 2057 }; 2058 (switch (parts.thread_kind) { 2059 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .fields = .{ 2060 .title = title, 2061 .labels = labels, 2062 .description = description, 2063 } }, author), 2064 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .fields = .{ 2065 .title = title, 2066 .labels = labels, 2067 .description = description, 2068 .target_branch = target_branch, 2069 } }, author), 2070 .discuss => updateDiscussion(io, allocator, host, parts.repo_base, &parts.thread_id, title, labels, description, author), 2071 else => unreachable, 2072 }) catch |err| switch (err) { 2073 error.NotFound => { 2074 try request.respond(not_found, .{ 2075 .status = .not_found, 2076 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 2077 }); 2078 return; 2079 }, 2080 else => { 2081 if (parts.thread_kind != .patch) return err; 2082 const failure = ui.Session.FormFeedback.PatchFailure.fromError(err) orelse return err; 2083 const form_location = try allocator.print("{s}/edit", .{base}); 2084 defer allocator.free(form_location); 2085 return respondThreadFormFailure(request, allocator, host, form_location, patchFeedback(failure, title, labels, description, target_branch, null)); 2086 }, 2087 }; 2088 2089 try request.respond("", .{ 2090 .status = .see_other, 2091 .extra_headers = &.{.{ .name = "location", .value = base }}, 2092 }); 2093 } 2094 2095 // resolve every conflicted field of the thread the url names 2096 fn handleThreadResolve( 2097 io: std.Io, 2098 request: *std.http.Server.Request, 2099 allocator: std.mem.Allocator, 2100 base: []const u8, 2101 host: Host, 2102 ) !void { 2103 const parts = commentBaseParts(host, base) orelse { 2104 try request.respond("thread not found", .{ 2105 .status = .not_found, 2106 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 2107 }); 2108 return; 2109 }; 2110 2111 var author_arena = std.heap.ArenaAllocator.init(allocator); 2112 defer author_arena.deinit(); 2113 const author = ((try authorizeWrite(io, allocator, &author_arena, request, host, parts.repo_base, .write, parts.thread_kind)) orelse return).author; 2114 2115 const body = try readFormBody(request, allocator); 2116 defer allocator.free(body); 2117 2118 var field_arena = std.heap.ArenaAllocator.init(allocator); 2119 defer field_arena.deinit(); 2120 const aa = field_arena.allocator(); 2121 const title = try parseFormField(aa, body, "title"); 2122 const labels = try parseFormField(aa, body, "labels"); 2123 2124 // the hunk inputs are submitted as d0, d1, ...; form submission normalizes their 2125 // textarea line breaks to CRLF 2126 var hunks: std.ArrayList([]const u8) = .empty; 2127 var hunk_index: usize = 0; 2128 while (true) : (hunk_index += 1) { 2129 const name = try aa.print("d{d}", .{hunk_index}); 2130 const submitted = (try parseFormField(aa, body, name)) orelse break; 2131 try hunks.append(aa, try std.mem.replaceOwned(u8, aa, submitted, "\r\n", "\n")); 2132 } 2133 2134 if (parts.comment_id != null or (parts.thread_kind != .issue and parts.thread_kind != .patch)) { 2135 try request.respond("thread not found", .{ 2136 .status = .not_found, 2137 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 2138 }); 2139 return; 2140 } 2141 const route = routeFromUrl(host, base) orelse { 2142 try request.respond("thread not found", .{ 2143 .status = .not_found, 2144 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 2145 }); 2146 return; 2147 }; 2148 const theirs: []const u8 = switch (route) { 2149 .repo_patches => |*patch| patch.theirs.slice(), 2150 .repo_issues => "", 2151 else => unreachable, 2152 }; 2153 const not_found = if (parts.thread_kind == .patch) "patch not found" else "issue not found"; 2154 2155 (switch (parts.thread_kind) { 2156 .issue => updateThread(evt.Issue, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 2157 .title = title, 2158 .labels = labels, 2159 .hunks = hunks.items, 2160 } }, author), 2161 .patch => updateThread(evt.Patch, io, allocator, host, parts.repo_base, &parts.thread_id, .{ .resolve = .{ 2162 .title = title, 2163 .labels = labels, 2164 .hunks = hunks.items, 2165 .theirs = theirs, 2166 } }, author), 2167 else => unreachable, 2168 }) catch |err| switch (err) { 2169 error.NotFound => { 2170 try request.respond(not_found, .{ 2171 .status = .not_found, 2172 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 2173 }); 2174 return; 2175 }, 2176 // invalid fields send the user back to the resolve form 2177 error.InvalidFields => { 2178 const form_location = try allocator.print("{s}/resolve", .{base}); 2179 defer allocator.free(form_location); 2180 try request.respond("", .{ 2181 .status = .see_other, 2182 .extra_headers = &.{.{ .name = "location", .value = form_location }}, 2183 }); 2184 return; 2185 }, 2186 else => |e| return e, 2187 }; 2188 2189 try request.respond("", .{ 2190 .status = .see_other, 2191 .extra_headers = &.{.{ .name = "location", .value = base }}, 2192 }); 2193 } 2194 2195 // the posted path drops the action's own segment, so the route it parses is 2196 // the undo page the action applies to, never the confirmation page itself 2197 fn handleUndo(io: std.Io, request: *std.http.Server.Request, allocator: std.mem.Allocator, base: []const u8, host: Host, action: enum { undo, clear }) !void { 2198 const route = routeFromUrl(host, base) orelse return respondRepoNotFound(request); 2199 if (route != .repo_undo) return respondRepoNotFound(request); 2200 const target = route.repo_undo; 2201 var arena = std.heap.ArenaAllocator.init(allocator); 2202 defer arena.deinit(); 2203 const repo_base = if (target.name.len == 0) "" else try arena.allocator().print("/{s}", .{target.name.slice()}); 2204 _ = (try authorizeWrite(io, allocator, &arena, request, host, repo_base, .owner, null)) orelse return; 2205 const resolved = (try requestRepoSource(io, allocator, host, repo_base)) orelse return respondRepoNotFound(request); 2206 defer resolved.deinit(allocator); 2207 (switch (action) { 2208 .undo => ui.Repo.Undo.execute(io, allocator, resolved.source, target.index orelse return respondRepoNotFound(request)), 2209 .clear => ui.Repo.Undo.clearHistory(io, allocator, resolved.source), 2210 }) catch |err| switch (err) { 2211 error.NotFound, error.InvalidHistoryIndex, error.TransactionNotFound => return respondRepoNotFound(request), 2212 else => return err, 2213 }; 2214 const location = try (ui.RoutablePage.repoUndoRoute(target.name.slice(), null) orelse return error.RouteTooLong).toUrl(&arena); 2215 try request.respond("", .{ .status = .see_other, .keep_alive = false, .extra_headers = &.{.{ .name = "location", .value = location }} }); 2216 } 2217 2218 fn handleSync( 2219 io: std.Io, 2220 request: *std.http.Server.Request, 2221 allocator: std.mem.Allocator, 2222 base: []const u8, 2223 source: ui.RepoSource, 2224 ) !void { 2225 if (base.len != 0) { 2226 try request.respond("not found", .{ 2227 .status = .not_found, 2228 .extra_headers = &.{.{ .name = "content-type", .value = "text/plain" }}, 2229 }); 2230 return; 2231 } 2232 2233 var owned_failure: ?[]u8 = null; 2234 defer if (owned_failure) |message| allocator.free(message); 2235 const failure: ?[]const u8 = blk: { 2236 owned_failure = ui.Repo.Events.sync(io, allocator, source) catch |err| break :blk @errorName(err); 2237 break :blk owned_failure; 2238 }; 2239 if (failure) |message| { 2240 var encoded: std.Io.Writer.Allocating = .init(allocator); 2241 defer encoded.deinit(); 2242 try std.Uri.Component.percentEncode(&encoded.writer, message, struct { 2243 fn isUnreserved(c: u8) bool { 2244 return std.ascii.isAlphanumeric(c) or c == '-' or c == '.' or c == '_' or c == '~'; 2245 } 2246 }.isUnreserved); 2247 const cookie = try allocator.print( 2248 local_flash_cookie ++ "=" ++ local_sync_failure_prefix ++ "{s}; Path=/; HttpOnly; SameSite=Strict", 2249 .{encoded.written()}, 2250 ); 2251 defer allocator.free(cookie); 2252 try request.respond("", .{ 2253 .status = .see_other, 2254 .extra_headers = &.{ 2255 .{ .name = "location", .value = "/events" }, 2256 .{ .name = "set-cookie", .value = cookie }, 2257 }, 2258 }); 2259 return; 2260 } 2261 2262 try request.respond("", .{ 2263 .status = .see_other, 2264 .extra_headers = &.{ 2265 .{ .name = "location", .value = "/events" }, 2266 .{ .name = "set-cookie", .value = local_flash_cookie ++ "=; Path=/; Max-Age=0" }, 2267 }, 2268 }); 2269 } 2270 2271 fn renderIndexHtml( 2272 io: std.Io, 2273 allocator: std.mem.Allocator, 2274 host: Host, 2275 session_token: ?[]const u8, 2276 session_data: ui.Session.Data, 2277 ) ![]const u8 { 2278 const template = (findEmbed("/index.html") orelse return error.MissingIndexAsset).body; 2279 2280 var page_arena = std.heap.ArenaAllocator.init(allocator); 2281 defer page_arena.deinit(); 2282 2283 // the server admin repo must outlive the page build, since the session's 2284 // moment reads from it. 2285 var repo_maybe: ?rp.Repo(.xit, evt.admin_repo_opts) = null; 2286 defer if (repo_maybe) |*repo| repo.deinit(io, allocator); 2287 2288 var session = switch (host) { 2289 .server => |server| blk: { 2290 // open the admin repo to read live user/repo data. 2291 repo_maybe = try rp.Repo(.xit, evt.admin_repo_opts).open(io, allocator, .{ .path = server.admin_repo_path }); 2292 const repo = if (repo_maybe) |*repo| repo else unreachable; 2293 var session = try ui.Session.init(&page_arena, repo, session_data); 2294 // the session dropped a user whose account was removed, so revoke 2295 // the token that named them 2296 if (session_token) |token| { 2297 if (session.data.user_id == null) server.session_store.remove(token); 2298 } 2299 // give the page builders filesystem access to the on-disk repos (a 2300 // sibling "users" dir next to the admin repo) so the Repo page can 2301 // read its files. 2302 session.users_dir = server.users_dir; 2303 break :blk session; 2304 }, 2305 .local => |local| ui.Session{ 2306 .data = session_data, 2307 .arena = &page_arena, 2308 .page_arena = &page_arena, 2309 .local = local, 2310 }, 2311 }; 2312 session.io = io; 2313 session.data.now = std.math.cast(i64, std.Io.Timestamp.now(io, .real).toSeconds()) orelse return error.TimestampOutOfRange; 2314 2315 var page = try ui.Page.init(session.page_arena, &session, session.data.current_page); 2316 var root = try ui.initRoot(allocator, &page, &session); 2317 defer root.deinit(allocator); 2318 2319 const snapshot: ui.Snapshot = .{ .page = page, .session = session.data }; 2320 2321 const content = try generateHtml(allocator, &root, &session); 2322 defer allocator.free(content); 2323 2324 // serialize the snapshot so the wasm side can parse it back without making 2325 // a second request. it's embedded raw in a <script type="application/json"> 2326 // block, whose content is raw text terminated only by "</script". in json, 2327 // '<' appears solely inside string values, so escaping every '<' (and '>' 2328 // for good measure) to its \uXXXX form yields equivalent json that can't 2329 // break out of the tag. 2330 var json: std.Io.Writer.Allocating = .init(allocator); 2331 defer json.deinit(); 2332 try std.json.Stringify.value(snapshot, .{}, &json.writer); 2333 2334 var json_escaped: std.ArrayList(u8) = .empty; 2335 defer json_escaped.deinit(allocator); 2336 for (json.written()) |c| switch (c) { 2337 '<' => try json_escaped.appendSlice(allocator, "\\u003c"), 2338 '>' => try json_escaped.appendSlice(allocator, "\\u003e"), 2339 else => try json_escaped.append(allocator, c), 2340 }; 2341 2342 var out: std.ArrayList(u8) = .empty; 2343 errdefer out.deinit(allocator); 2344 { 2345 var cursor: usize = 0; 2346 for (&[_]struct { needle: []const u8, replacement: []const u8 }{ 2347 .{ .needle = "{{{ HAXY_HTML }}}", .replacement = content }, 2348 .{ .needle = "{{{ HAXY_JSON }}}", .replacement = json_escaped.items }, 2349 }) |sub| { 2350 const idx = std.mem.indexOfPos(u8, template, cursor, sub.needle) orelse return error.MissingTemplateToken; 2351 try out.appendSlice(allocator, template[cursor..idx]); 2352 try out.appendSlice(allocator, sub.replacement); 2353 cursor = idx + sub.needle.len; 2354 } 2355 try out.appendSlice(allocator, template[cursor..]); 2356 } 2357 return try out.toOwnedSlice(allocator); 2358 } 2359 2360 fn findEmbed(request_path: []const u8) ?Embed { 2361 // embeds are matched before pages, so a dot keeps them from claiming a username or tab 2362 comptime for (embeds) |embed| { 2363 if (std.mem.indexOfScalar(u8, embed.path, '.') == null) @compileError("embed path needs a '.' so it can't shadow a page: " ++ embed.path); 2364 }; 2365 if (request_path.len < 2 or request_path[0] != '/') return null; 2366 const path = request_path[1..]; 2367 2368 for (embeds) |embed| { 2369 if (std.mem.eql(u8, path, embed.path)) return embed; 2370 } 2371 return null; 2372 } 2373 2374 // emits the TUI grid cells as static HTML. each web-native Scroll becomes its 2375 // own absolutely-positioned, natively-scrollable <div> holding its full content, 2376 // rendered recursively so nested scrolls work. 2377 pub fn generateHtml(allocator: std.mem.Allocator, root: *ui.Widget, session: *ui.Session) ![]const u8 { 2378 const grid = root.getGrid() orelse return error.MissingGrid; 2379 const root_focus = root.getFocus(); 2380 2381 var out: std.ArrayList(u8) = .empty; 2382 errdefer out.deinit(allocator); 2383 2384 switch (root.*) { 2385 .background => |*background| { 2386 if (background.art.getGrid()) |art| { 2387 try out.print(allocator, "<div class=\"ansi-art\" aria-hidden=\"true\" style=\"left:{d}ch;opacity:{d}%\">", .{ grid.size.width -| art.size.width, ui.widget.AnsiBackground.art_opacity }); 2388 try renderPanel(allocator, &out, background.art.getFocus(), art, session, root_focus); 2389 try out.appendSlice(allocator, "</div>"); 2390 } 2391 }, 2392 else => {}, 2393 } 2394 try out.appendSlice(allocator, "<div class=\"grid-content\" data-key=\"panel:root\">"); 2395 try renderPanel(allocator, &out, root_focus, grid, session, root_focus); 2396 try out.appendSlice(allocator, "</div>"); 2397 try renderForms(allocator, &out, root_focus); 2398 return try out.toOwnedSlice(allocator); 2399 } 2400 2401 // render one panel — a focus subtree and its content grid — as HTML, recursing 2402 // once per web-native Scroll inside it. the root panel is the whole page; each 2403 // Scroll becomes a nested, natively-scrollable div holding its full content. 2404 // emits the panel's grid cells as text, leaving holes where child scrolls sit, 2405 // then the child scroll divs over those holes. 2406 fn renderPanel(allocator: std.mem.Allocator, output: *std.ArrayList(u8), focus: *Focus, grid: Grid, session: *ui.Session, root_focus: *Focus) !void { 2407 // `direct` is this panel's scroll children, each drawn as an overlaid div. 2408 // `excluded` is every focus id that belongs to a scroll (the scroll nodes 2409 // plus their descendants, which the focus tree flattens into this panel's 2410 // children): the cell hit-test below skips them so this panel doesn't claim 2411 // cells that are really rendered inside a child scroll's own panel. 2412 // (scrolls aren't nested in practice, so every scroll child is direct here.) 2413 var direct: std.ArrayList(usize) = .empty; 2414 defer direct.deinit(allocator); 2415 var excluded: std.AutoHashMapUnmanaged(usize, void) = .empty; 2416 defer excluded.deinit(allocator); 2417 { 2418 var it = focus.children.iterator(); 2419 while (it.next()) |e| { 2420 if (e.value_ptr.focus.scroll == null) continue; 2421 try direct.append(allocator, e.key_ptr.*); 2422 try excluded.put(allocator, e.key_ptr.*, {}); 2423 var mit = e.value_ptr.focus.children.iterator(); 2424 while (mit.next()) |m| try excluded.put(allocator, m.key_ptr.*, {}); 2425 } 2426 } 2427 2428 // the HTML element a run of cells is wrapped in, chosen from the cell's 2429 // focusable kind 2430 const CellTag = union(enum) { 2431 span, // clickable focusable cell 2432 a: []const u8, // clickable focusable link 2433 plain, // non-focusable, colored 2434 2435 const a_prefix = "a:"; 2436 // an "in-page" anchor: rendered as a real <a href> so it works with js 2437 // disabled, but wasm handles it without navigating. 2438 fn init(str: []const u8) @This() { 2439 if (std.mem.startsWith(u8, str, ui.raw_link_prefix)) { 2440 return .{ .a = str[ui.raw_link_prefix.len..] }; 2441 } 2442 if (std.mem.startsWith(u8, str, ui.in_page_link_prefix)) { 2443 return .{ .a = str[ui.in_page_link_prefix.len..] }; 2444 } 2445 if (std.mem.startsWith(u8, str, a_prefix)) { 2446 return .{ .a = str[a_prefix.len..] }; 2447 } 2448 return .span; 2449 } 2450 2451 fn writeOpenTag(self: @This(), alloc: std.mem.Allocator, out: *std.ArrayList(u8), id: usize, style_attr: []const u8) !void { 2452 var id_buf: [32]u8 = undefined; 2453 switch (self) { 2454 .span => { 2455 try out.appendSlice(alloc, "<span class=\"clickable\" data-focus-id=\""); 2456 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2457 try out.appendSlice(alloc, "\""); 2458 try out.appendSlice(alloc, style_attr); 2459 try out.appendSlice(alloc, ">"); 2460 }, 2461 .a => |href| { 2462 // tabindex=-1 keeps these out of the browser's tab order 2463 try out.appendSlice(alloc, "<a class=\"clickable\" tabindex=\"-1\" data-focus-id=\""); 2464 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2465 try out.appendSlice(alloc, "\" href=\""); 2466 try appendEscapedHtml(alloc, out, href); 2467 try out.appendSlice(alloc, "\""); 2468 try out.appendSlice(alloc, style_attr); 2469 try out.appendSlice(alloc, ">"); 2470 }, 2471 .plain => { 2472 try out.appendSlice(alloc, "<span"); 2473 try out.appendSlice(alloc, style_attr); 2474 try out.appendSlice(alloc, ">"); 2475 }, 2476 } 2477 } 2478 2479 fn closeTag(self: @This()) []const u8 { 2480 return switch (self) { 2481 .span, .plain => "</span>", 2482 .a => "</a>", 2483 }; 2484 } 2485 }; 2486 2487 // the focusable owning each cell, among this panel's own (skipping any 2488 // that belong to a child scroll, whose cells are drawn in their own panel). 2489 // claimed in focus order, so the first focusable over a cell keeps it. 2490 // looking every focusable up for every cell is quadratic in a long list. 2491 const owners = try allocator.alloc(?usize, grid.size.width * grid.size.height); 2492 defer allocator.free(owners); 2493 @memset(owners, null); 2494 { 2495 var it = focus.children.iterator(); 2496 while (it.next()) |entry| { 2497 const child = entry.value_ptr.*; 2498 if (child.focus.mode != .all) continue; 2499 if (excluded.contains(entry.key_ptr.*)) continue; 2500 const r = child.rect; 2501 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2502 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2503 const owner = &owners[y * grid.size.width + x]; 2504 if (owner.* == null) owner.* = entry.key_ptr.*; 2505 } 2506 } 2507 } 2508 } 2509 2510 // the cells are the volatile part of a panel. js replaces this one subtree 2511 // wholesale while retaining the panel's native controls and scroll shells. 2512 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2513 2514 // emit this panel's grid as rows of text, coalescing adjacent cells that 2515 // share a focus id and style into one tag (a clickable span, a link, or a 2516 // plain styled span). cells under a child scroll keep only their background. 2517 // a cell's own link is an anchor nested in that tag. 2518 for (0..grid.size.height) |y| { 2519 var cur_id: ?usize = null; 2520 var cur_style: Grid.Style = .{}; 2521 var open_tag: ?CellTag = null; 2522 var open_link: ?[]const u8 = null; 2523 var first = true; 2524 for (0..grid.size.width) |x| { 2525 const cell = (try grid.cell(x, y)).*; 2526 // a cell covered by a child scroll's viewport is drawn by that scroll's 2527 // own div, so blank its glyph and make it non-clickable here — but keep 2528 // its background, so the backdrop still shows through the scroll's 2529 // transparent div instead of a bare hole. 2530 const covered_by_scroll = blk: { 2531 for (direct.items) |id| { 2532 const r = (focus.children.get(id) orelse continue).rect; 2533 if (x >= r.x and y >= r.y and x < r.x + r.size.width and y < r.y + r.size.height) break :blk true; 2534 } 2535 break :blk false; 2536 }; 2537 // the focusable owning the cell at (x, y); none for a covered cell. 2538 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2539 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2540 2541 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2542 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2543 open_link = null; 2544 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2545 2546 var new_tag: ?CellTag = null; 2547 if (cell_id) |id| { 2548 if (focus.children.get(id)) |child| { 2549 new_tag = switch (child.focus.kind) { 2550 .custom => |custom| CellTag.init(custom), 2551 else => .span, 2552 }; 2553 } 2554 } 2555 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2556 2557 if (new_tag) |t| { 2558 var style_buf: [192]u8 = undefined; 2559 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2560 } 2561 2562 open_tag = new_tag; 2563 cur_id = cell_id; 2564 cur_style = style; 2565 first = false; 2566 } 2567 2568 // an anchor can't nest in another, so a link tag's cells skip theirs 2569 const in_anchor = if (open_tag) |t| t == .a else false; 2570 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2571 if (!sameLink(link, open_link)) { 2572 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2573 if (link) |url| { 2574 // a page path opens in this tab, any other url in a new one 2575 try output.appendSlice(allocator, if (url[0] == '/') 2576 "<a class=\"cell-link\" tabindex=\"-1\" href=\"" 2577 else 2578 "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2579 try appendEscapedHtml(allocator, output, url); 2580 try output.appendSlice(allocator, "\">"); 2581 } 2582 open_link = link; 2583 } 2584 2585 if (covered_by_scroll) { 2586 try appendEscapedHtml(allocator, output, " "); 2587 } else if (cell.continuation) { 2588 // the wide rune to the left was emitted 2ch wide, covering this column 2589 } else if (cell.rune) |rune| { 2590 var encoded: [4]u8 = undefined; 2591 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2592 const rune_text = encoded[0..encoded_len]; 2593 // a double-width rune is pinned inside a 2ch span so the 2594 // fallback glyph's advance width can't shift the rest of the row 2595 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2596 if (wide) { 2597 try output.appendSlice(allocator, "<span class=\"w2\">"); 2598 try appendEscapedHtml(allocator, output, rune_text); 2599 try output.appendSlice(allocator, "</span>"); 2600 } else { 2601 try appendEscapedHtml(allocator, output, rune_text); 2602 } 2603 } else { 2604 try appendEscapedHtml(allocator, output, " "); 2605 } 2606 } 2607 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2608 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2609 try output.append(allocator, '\n'); 2610 } 2611 try output.appendSlice(allocator, "</div>"); 2612 2613 // native controls live in their panel, beside the replaceable cells. their 2614 // stable keys let JS update layout without recreating their DOM nodes, and 2615 // being actual descendants of a scroll gives them native movement/clipping. 2616 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2617 2618 // each child scroll becomes a natively-scrollable div positioned over its 2619 // viewport, holding its full content rendered recursively. 2620 for (direct.items) |id| { 2621 const child = focus.children.get(id) orelse continue; 2622 const info = child.focus.scroll orelse continue; 2623 const r = child.rect; 2624 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2625 // when that axis actually overflows. the other axis is clipped (hidden), 2626 // matching how the terminal Scroll handles its non-scrolling axis. 2627 const overflow = switch (info.direction) { 2628 .vert => "overflow-x:hidden;overflow-y:auto", 2629 .horiz => "overflow-x:auto;overflow-y:hidden", 2630 .both => "overflow:auto", 2631 }; 2632 // the id carries a content version so JS preserves the native scroll 2633 // position across re-renders of the same content but resets it when the 2634 // content is replaced — e.g. selecting a different commit. the widget's 2635 // scroll offset (in cells) rides along so JS can apply it when it has no 2636 // preserved position, letting a wasm-side scrollToRect (the files list 2637 // scrolling to its selected row on page load) reach the browser. 2638 var buf: [256]u8 = undefined; 2639 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, "<div class=\"scroll\" data-key=\"scroll:{d}\" data-scroll-id=\"{d}-{d}\" data-scroll-direction=\"{s}\" data-scroll-x=\"{d}\" data-scroll-y=\"{d}\" style=\"left:{d}ch;top:{d}em;width:{d}ch;height:{d}em;{s}\">", .{ id, id, child.focus.version, @tagName(info.direction), info.offset_x, info.offset_y, r.x, r.y, r.size.width, r.size.height, overflow })); 2640 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2641 try output.appendSlice(allocator, "</div>"); 2642 } 2643 } 2644 2645 const form_prefix = "form:"; 2646 const form_id_prefix = "haxy-form-"; 2647 2648 fn formAction(focus: *const Focus) ?[]const u8 { 2649 return switch (focus.kind) { 2650 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2651 else => null, 2652 }; 2653 } 2654 2655 // find the form ancestor of a flattened focus-tree child. html's `form` 2656 // attribute then associates the control with that form without requiring the 2657 // form and control to share a DOM parent. 2658 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2659 var id = focus_id; 2660 while (root_focus.children.get(id)) |child| { 2661 const parent_id = child.parent_id; 2662 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2663 const parent = root_focus.children.get(parent_id) orelse return null; 2664 if (formAction(parent.focus) != null) return parent_id; 2665 id = parent_id; 2666 } 2667 return null; 2668 } 2669 2670 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2671 const form_id = formOwner(root_focus, focus_id) orelse return; 2672 var buf: [64]u8 = undefined; 2673 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2674 } 2675 2676 fn renderPanelControls( 2677 allocator: std.mem.Allocator, 2678 output: *std.ArrayList(u8), 2679 focus: *Focus, 2680 session: *ui.Session, 2681 root_focus: *Focus, 2682 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2683 ) !void { 2684 var iter = focus.children.iterator(); 2685 while (iter.next()) |entry| { 2686 const id = entry.key_ptr.*; 2687 if (excluded.contains(id)) continue; 2688 const child = entry.value_ptr.*; 2689 const r = child.rect; 2690 2691 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2692 2693 switch (child.focus.kind) { 2694 .text_input, .text_input_password, .text_area => { 2695 const ti = session.text_inputs.get(id) orelse continue; 2696 2697 const inner_left = r.x + 1; 2698 const inner_top = r.y + 1; 2699 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2700 const preserve = !ti.options.read_only; 2701 2702 if (child.focus.kind == .text_area) { 2703 const value = try ti.text(allocator); 2704 defer allocator.free(value); 2705 var id_buf: [128]u8 = undefined; 2706 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2707 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2708 try appendFormAttribute(allocator, output, root_focus, id); 2709 if (ti.options.name.len > 0) { 2710 try output.appendSlice(allocator, " name=\""); 2711 try appendEscapedHtml(allocator, output, ti.options.name); 2712 try output.append(allocator, '"'); 2713 } 2714 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2715 var pos_buf: [128]u8 = undefined; 2716 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\">\n", .{ inner_left, inner_top, inner_width, inner_height })); 2717 try appendEscapedHtml(allocator, output, value); 2718 try output.appendSlice(allocator, "</textarea>"); 2719 continue; 2720 } 2721 2722 var id_buf: [160]u8 = undefined; 2723 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"{s}\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ if (child.focus.kind == .text_input_password) "password" else "text", id, id })); 2724 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2725 try appendFormAttribute(allocator, output, root_focus, id); 2726 if (ti.options.name.len > 0) { 2727 try output.appendSlice(allocator, " name=\""); 2728 try appendEscapedHtml(allocator, output, ti.options.name); 2729 try output.append(allocator, '"'); 2730 } 2731 if (child.focus.kind != .text_input_password) { 2732 const value = try ti.text(allocator); 2733 defer allocator.free(value); 2734 try output.appendSlice(allocator, " value=\""); 2735 try appendEscapedHtml(allocator, output, value); 2736 try output.append(allocator, '"'); 2737 } 2738 var pos_buf: [96]u8 = undefined; 2739 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"left:{d}ch;top:{d}em;width:{d}ch;height:1em\">", .{ inner_left, inner_top, inner_width })); 2740 }, 2741 .custom => |custom| { 2742 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2743 if (formOwner(root_focus, id) == null) continue; 2744 var id_buf: [128]u8 = undefined; 2745 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2746 try appendFormAttribute(allocator, output, root_focus, id); 2747 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2748 try output.appendSlice(allocator, " formaction=\""); 2749 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2750 try output.append(allocator, '"'); 2751 } 2752 var pos_buf: [128]u8 = undefined; 2753 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\"></button>", .{ r.x, r.y, r.size.width, r.size.height })); 2754 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2755 // an invisible native radio over the option, checked when the option is its row's selection 2756 const field = custom[ui.radio_prefix.len..]; 2757 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2758 const row = root_focus.children.get(child.parent_id) orelse continue; 2759 var id_buf: [128]u8 = undefined; 2760 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2761 try appendFormAttribute(allocator, output, root_focus, id); 2762 try output.appendSlice(allocator, " name=\""); 2763 try appendEscapedHtml(allocator, output, field[0..separator]); 2764 try output.appendSlice(allocator, "\" value=\""); 2765 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2766 try output.append(allocator, '"'); 2767 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2768 var pos_buf: [128]u8 = undefined; 2769 try output.appendSlice(allocator, try std.fmt.bufPrint(&pos_buf, " style=\"opacity:0;left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\">", .{ r.x, r.y, r.size.width, r.size.height })); 2770 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2771 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2772 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2773 var id_buf: [128]u8 = undefined; 2774 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "\" data-key=\"control:{d}\" data-focus-id=\"{d}\" style=\"opacity:0;left:{d}ch;top:{d}em;width:{d}ch;height:{d}em\">", .{ id, id, r.x, r.y, r.size.width, r.size.height })); 2775 } 2776 }, 2777 else => {}, 2778 } 2779 } 2780 } 2781 2782 // emit hidden form owners beside the rendered panels. their controls point 2783 // back here with the standard HTML `form` attribute. 2784 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2785 // the focus child map preserves insertion order, which matches the order 2786 // widgets were added in code 2787 var iter = root_focus.children.iterator(); 2788 while (iter.next()) |entry| { 2789 const child = entry.value_ptr.*; 2790 const action_url = formAction(child.focus) orelse continue; 2791 2792 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2793 var id_buf: [96]u8 = undefined; 2794 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2795 try appendEscapedHtml(allocator, output, action_url); 2796 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2797 } 2798 } 2799 2800 // the 16 ansi colors as the browser shows them (xterm's defaults) 2801 const ansi_palette = [16]Grid.Color.Rgb{ 2802 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2803 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2804 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2805 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2806 }; 2807 2808 // resolve any color to rgb: palette colors through the ansi table and the 2809 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2810 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2811 return switch (color) { 2812 .rgb => |c| c, 2813 .ansi => |a| ansi_palette[@backingInt(a)], 2814 .indexed => |n| if (n < 16) 2815 ansi_palette[n] 2816 else if (n < 232) blk: { 2817 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2818 const i = n - 16; 2819 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2820 } else blk: { 2821 const v: u8 = 8 + (n - 232) * 10; 2822 break :blk .{ .r = v, .g = v, .b = v }; 2823 }, 2824 }; 2825 } 2826 2827 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2828 // cell's style into `buf`, omitting whichever color is unset. an inverted 2829 // cell swaps the two, falling back to the page's --fg/--bg variables for 2830 // whichever side is unset. text attributes follow the colors. returns an 2831 // empty slice when nothing is set. 2832 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2833 if (style.eql(.{})) return buf[0..0]; 2834 const prefix = " style=\""; 2835 @memcpy(buf[0..prefix.len], prefix); 2836 var i: usize = prefix.len; 2837 const inverted = style.inverted; 2838 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2839 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2840 const decoration: []const u8 = if (style.underline and style.strikethrough) 2841 "text-decoration:underline line-through;" 2842 else if (style.underline) 2843 "text-decoration:underline;" 2844 else if (style.strikethrough) 2845 "text-decoration:line-through;" 2846 else 2847 ""; 2848 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2849 if (style.bold) "font-weight:bold;" else "", 2850 if (style.italic) "font-style:italic;" else "", 2851 decoration, 2852 if (style.dim) "opacity:.6;" else "", 2853 }) catch return buf[0..0]; 2854 i += attributes.len; 2855 if (i >= buf.len) return buf[0..0]; 2856 buf[i] = '"'; 2857 return buf[0 .. i + 1]; 2858 } 2859 2860 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2861 // the color is unset (nothing when both are). returns the new end, or null 2862 // when it doesn't fit. 2863 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2864 const s = if (color) |c| blk: { 2865 const v = colorRgb(c); 2866 break :blk std.fmt.bufPrint(buf[i..], "{s}:#{x:0>2}{x:0>2}{x:0>2};", .{ prop, v.r, v.g, v.b }) catch return null; 2867 } else if (fallback) |f| 2868 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2869 else 2870 return i; 2871 return i + s.len; 2872 } 2873 2874 // a cell's link as an href, when it's a page path or a web or mail url 2875 fn webLink(link: ?[]const u8) ?[]const u8 { 2876 const url = link orelse return null; 2877 // a page path, not a protocol-relative url 2878 if (url.len > 1 and url[0] == '/' and url[1] != '/') return url; 2879 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2880 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2881 } 2882 return null; 2883 } 2884 2885 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2886 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2887 return b == null; 2888 } 2889 2890 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2891 for (input) |ch| { 2892 switch (ch) { 2893 '&' => try out.appendSlice(allocator, "&"), 2894 '<' => try out.appendSlice(allocator, "<"), 2895 '>' => try out.appendSlice(allocator, ">"), 2896 '"' => try out.appendSlice(allocator, """), 2897 '\'' => try out.appendSlice(allocator, "'"), 2898 else => try out.append(allocator, ch), 2899 } 2900 } 2901 } 2902 2903 // --- helpers -------------------------------------------------------------- 2904 2905 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2906 var iter = request.iterateHeaders(); 2907 while (iter.next()) |header| { 2908 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2909 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2910 while (pairs.next()) |pair| { 2911 const trimmed = std.mem.trim(u8, pair, " \t"); 2912 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2913 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2914 return trimmed[eq + 1 ..]; 2915 } 2916 } 2917 } 2918 return null; 2919 } 2920 2921 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2922 var iter = std.mem.splitScalar(u8, body, '&'); 2923 while (iter.next()) |pair| { 2924 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2925 if (std.mem.eql(u8, pair[0..eq], key)) { 2926 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2927 } 2928 } 2929 return null; 2930 } 2931 2932 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2933 var buffer: [256]u8 = undefined; 2934 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2935 } 2936 2937 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2938 var out: std.ArrayList(u8) = .empty; 2939 errdefer out.deinit(allocator); 2940 var i: usize = 0; 2941 while (i < encoded.len) : (i += 1) { 2942 switch (encoded[i]) { 2943 '+' => try out.append(allocator, ' '), 2944 '%' => { 2945 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2946 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2947 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2948 try out.append(allocator, hi * 16 + lo); 2949 i += 2; 2950 }, 2951 else => try out.append(allocator, encoded[i]), 2952 } 2953 } 2954 return try out.toOwnedSlice(allocator); 2955 } 2956 2957 // disk-backed web session store. each login mints a random, opaque token 2958 // (not the user's id) that is stored as a file named by the token hex, whose 2959 // contents are the raw user_id bytes. authenticating a request is a lookup of 2960 // the cookie's token; logout deletes the file, revoking the session. there is 2961 // deliberately no expiry — a session lives until logout. form failures use 2962 // files in the flash subdirectory that the redirected GET consumes. the 2963 // directory is cleared whenever the server starts. 2964 pub const SessionStore = struct { 2965 io: std.Io, 2966 dir: std.Io.Dir, 2967 flash_dir: std.Io.Dir, 2968 auto_login: ?[token_hex_len]u8, 2969 2970 pub const token_hex_len = evt.event_id_size * 2; 2971 2972 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2973 try data_dir.createDirPath(io, "sessions"); 2974 const dir = try data_dir.openDir(io, "sessions", .{}); 2975 errdefer dir.close(io); 2976 try dir.deleteTree(io, "flash"); 2977 try dir.createDirPath(io, "flash"); 2978 const flash_dir = try dir.openDir(io, "flash", .{}); 2979 errdefer flash_dir.close(io); 2980 const auto_login = blk: { 2981 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2982 defer file.close(io); 2983 var token: [token_hex_len]u8 = undefined; 2984 var storage: [token_hex_len]u8 = undefined; 2985 var reader = file.reader(io, &storage); 2986 reader.interface.readSliceAll(&token) catch break :blk null; 2987 break :blk token; 2988 }; 2989 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2990 } 2991 2992 pub fn deinit(self: SessionStore) void { 2993 self.flash_dir.close(self.io); 2994 self.dir.close(self.io); 2995 } 2996 2997 // mint a new session for user_id, returning the token hex to set as the 2998 // cookie value. 2999 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 3000 var token: [evt.event_id_size]u8 = undefined; 3001 self.io.random(&token); 3002 const token_hex = std.fmt.bytesToHex(token, .lower); 3003 const file = try self.dir.createFile(self.io, &token_hex, .{}); 3004 defer file.close(self.io); 3005 try file.writeStreamingAll(self.io, user_id); 3006 return token_hex; 3007 } 3008 3009 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 3010 var token: [evt.event_id_size]u8 = undefined; 3011 self.io.random(&token); 3012 const token_hex = std.fmt.bytesToHex(token, .lower); 3013 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 3014 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 3015 defer file.close(self.io); 3016 3017 var json: std.Io.Writer.Allocating = .init(allocator); 3018 defer json.deinit(); 3019 try std.json.Stringify.value(value, .{}, &json.writer); 3020 try file.writeStreamingAll(self.io, json.written()); 3021 return token_hex; 3022 } 3023 3024 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 3025 if (!isToken(token_hex)) return null; 3026 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 3027 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 3028 defer file.close(self.io); 3029 3030 var storage: [4096]u8 = undefined; 3031 var reader = file.reader(self.io, &storage); 3032 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 3033 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 3034 } 3035 3036 // resolve a cookie's token to its user_id. returns false (logged out) for a 3037 // missing, malformed, or unknown token. 3038 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 3039 if (!isToken(token_hex)) return false; 3040 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 3041 defer file.close(self.io); 3042 var storage: [evt.event_id_size]u8 = undefined; 3043 var file_reader = file.reader(self.io, &storage); 3044 file_reader.interface.readSliceAll(out) catch return false; 3045 return true; 3046 } 3047 3048 // revoke a session. a no-op for a missing or malformed token. 3049 pub fn remove(self: SessionStore, token_hex: []const u8) void { 3050 if (!isToken(token_hex)) return; 3051 self.dir.deleteFile(self.io, token_hex) catch {}; 3052 } 3053 3054 // leave `token_hex`'s session for visitors arriving without one. only the 3055 // `try` fixture writes one. the name can't collide with a session token. 3056 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 3057 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 3058 defer file.close(self.io); 3059 try file.writeStreamingAll(self.io, token_hex); 3060 } 3061 3062 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 3063 out.* = self.auto_login orelse return false; 3064 return true; 3065 } 3066 3067 const auto_login_name = "auto-login"; 3068 3069 // a token is exactly token_hex_len hex chars. validating before using the 3070 // value as a path keeps attacker-supplied cookies from escaping the 3071 // sessions dir (e.g. via "/" or ".." bytes). 3072 fn isToken(token_hex: []const u8) bool { 3073 if (token_hex.len != token_hex_len) return false; 3074 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 3075 return true; 3076 } 3077 }; 3078