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3169 // a token is exactly token_hex_len hex chars. validating before using the 3170 // value as a path keeps attacker-supplied cookies from escaping the 3171 // sessions dir (e.g. via "/" or ".." bytes). 3172 fn isToken(token_hex: []const u8) bool { 3173 if (token_hex.len != token_hex_len) return false; 3174 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 3175 return true; 3176 } 3177 }; 3178