╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭───────────────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭master╮ master haxy: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues patches new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────╯ (712) user
╭ find file ─ ─ ─ ─ ─ ─ ─ ─ ─ ─╮ ╭────╮ ╭ clone ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─╮ │ │ │http│ ssh │ │ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─╯ ╰────╯ ╰ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─╯
.. embed/ event/ test/ ui/ command.zig diff3.zig event.zig find.zig fork.zig lib.zig main.zig main_wasm.zig markdown.zig notify.zig patch.zig progress.zig push.zig search.zig search_commit.zig search_thread.zig serve.zig serve_common.zig serve_http.zig serve_ssh.zig serve_ssh_protocol.zig test.zig testnet.zig try.zig ui.zig ╭─────────────────────────────────╮ │web.zig │ ╰─────────────────────────────────╯
2578 2579 fn closeTag(self: @This()) []const u8 { 2580 return switch (self) { 2581 .span, .plain => "</span>", 2582 .a => "</a>", 2583 }; 2584 } 2585 }; 2586 2587 // the focusable owning each cell, among this panel's own (skipping any 2588 // that belong to a child scroll, whose cells are drawn in their own panel). 2589 // claimed in focus order, so the first focusable over a cell keeps it. 2590 // looking every focusable up for every cell is quadratic in a long list. 2591 const owners = try allocator.alloc(?usize, grid.size.width * grid.size.height); 2592 defer allocator.free(owners); 2593 @memset(owners, null); 2594 { 2595 var it = focus.children.iterator(); 2596 while (it.next()) |entry| { 2597 const child = entry.value_ptr.*; 2598 if (child.focus.mode != .all) continue; 2599 if (excluded.contains(entry.key_ptr.*)) continue; 2600 const r = child.rect; 2601 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2602 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2603 const owner = &owners[y * grid.size.width + x]; 2604 if (owner.* == null) owner.* = entry.key_ptr.*; 2605 } 2606 } 2607 } 2608 } 2609 2610 // the cells are the volatile part of a panel. js replaces this one subtree 2611 // wholesale while retaining the panel's native controls and scroll shells. 2612 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2613 2614 // emit this panel's grid as rows of text, coalescing adjacent cells that 2615 // share a focus id and style into one tag (a clickable span, a link, or a 2616 // plain styled span). cells under a child scroll keep only their background. 2617 // a cell's own link is an anchor nested in that tag. 2618 for (0..grid.size.height) |y| { 2619 var cur_id: ?usize = null; 2620 var cur_style: Grid.Style = .{}; 2621 var open_tag: ?CellTag = null; 2622 var open_link: ?[]const u8 = null; 2623 var first = true; 2624 for (0..grid.size.width) |x| { 2625 const cell = (try grid.cell(x, y)).*; 2626 // a cell covered by a child scroll's viewport is drawn by that scroll's 2627 // own div, so blank its glyph and make it non-clickable here — but keep 2628 // its background, so the backdrop still shows through the scroll's 2629 // transparent div instead of a bare hole. 2630 const covered_by_scroll = blk: { 2631 for (direct.items) |id| { 2632 const r = (focus.children.get(id) orelse continue).rect; 2633 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; 2634 } 2635 break :blk false; 2636 }; 2637 // the focusable owning the cell at (x, y); none for a covered cell. 2638 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2639 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2640 2641 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2642 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2643 open_link = null; 2644 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2645 2646 var new_tag: ?CellTag = null; 2647 if (cell_id) |id| { 2648 if (focus.children.get(id)) |child| { 2649 new_tag = switch (child.focus.kind) { 2650 .custom => |custom| CellTag.init(custom), 2651 else => .span, 2652 }; 2653 } 2654 } 2655 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2656 2657 if (new_tag) |t| { 2658 var style_buf: [192]u8 = undefined; 2659 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2660 } 2661 2662 open_tag = new_tag; 2663 cur_id = cell_id; 2664 cur_style = style; 2665 first = false; 2666 } 2667 2668 // an anchor can't nest in another, so a link tag's cells skip theirs 2669 const in_anchor = if (open_tag) |t| t == .a else false; 2670 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2671 if (!sameLink(link, open_link)) { 2672 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2673 if (link) |url| { 2674 // a page path opens in this tab, any other url in a new one 2675 try output.appendSlice(allocator, if (url[0] == '/') 2676 "<a class=\"cell-link\" tabindex=\"-1\" href=\"" 2677 else 2678 "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2679 try appendEscapedHtml(allocator, output, url); 2680 try output.appendSlice(allocator, "\">"); 2681 } 2682 open_link = link; 2683 } 2684 2685 if (covered_by_scroll) { 2686 try appendEscapedHtml(allocator, output, " "); 2687 } else if (cell.continuation) { 2688 // the wide rune to the left was emitted 2ch wide, covering this column 2689 } else if (cell.rune) |rune| { 2690 var encoded: [4]u8 = undefined; 2691 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2692 const rune_text = encoded[0..encoded_len]; 2693 // a double-width rune is pinned inside a 2ch span so the 2694 // fallback glyph's advance width can't shift the rest of the row 2695 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2696 if (wide) { 2697 try output.appendSlice(allocator, "<span class=\"w2\">"); 2698 try appendEscapedHtml(allocator, output, rune_text); 2699 try output.appendSlice(allocator, "</span>"); 2700 } else { 2701 try appendEscapedHtml(allocator, output, rune_text); 2702 } 2703 } else { 2704 try appendEscapedHtml(allocator, output, " "); 2705 } 2706 } 2707 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2708 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2709 try output.append(allocator, '\n'); 2710 } 2711 try output.appendSlice(allocator, "</div>"); 2712 2713 // native controls live in their panel, beside the replaceable cells. their 2714 // stable keys let JS update layout without recreating their DOM nodes, and 2715 // being actual descendants of a scroll gives them native movement/clipping. 2716 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2717 2718 // each child scroll becomes a natively-scrollable div positioned over its 2719 // viewport, holding its full content rendered recursively. 2720 for (direct.items) |id| { 2721 const child = focus.children.get(id) orelse continue; 2722 const info = child.focus.scroll orelse continue; 2723 const r = child.rect; 2724 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2725 // when that axis actually overflows. the other axis is clipped (hidden), 2726 // matching how the terminal Scroll handles its non-scrolling axis. 2727 const overflow = switch (info.direction) { 2728 .vert => "overflow-x:hidden;overflow-y:auto", 2729 .horiz => "overflow-x:auto;overflow-y:hidden", 2730 .both => "overflow:auto", 2731 }; 2732 // the id carries a content version so JS preserves the native scroll 2733 // position across re-renders of the same content but resets it when the 2734 // content is replaced — e.g. selecting a different commit. the widget's 2735 // scroll offset (in cells) rides along so JS can apply it when it has no 2736 // preserved position, letting a wasm-side scrollToRect (the files list 2737 // scrolling to its selected row on page load) reach the browser. 2738 var buf: [256]u8 = undefined; 2739 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 })); 2740 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2741 try output.appendSlice(allocator, "</div>"); 2742 } 2743 } 2744 2745 const form_prefix = "form:"; 2746 const form_id_prefix = "haxy-form-"; 2747 2748 fn formAction(focus: *const Focus) ?[]const u8 { 2749 return switch (focus.kind) { 2750 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2751 else => null, 2752 }; 2753 } 2754 2755 // find the form ancestor of a flattened focus-tree child. html's `form` 2756 // attribute then associates the control with that form without requiring the 2757 // form and control to share a DOM parent. 2758 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2759 var id = focus_id; 2760 while (root_focus.children.get(id)) |child| { 2761 const parent_id = child.parent_id; 2762 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2763 const parent = root_focus.children.get(parent_id) orelse return null; 2764 if (formAction(parent.focus) != null) return parent_id; 2765 id = parent_id; 2766 } 2767 return null; 2768 } 2769 2770 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2771 const form_id = formOwner(root_focus, focus_id) orelse return; 2772 var buf: [64]u8 = undefined; 2773 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2774 } 2775 2776 fn renderPanelControls( 2777 allocator: std.mem.Allocator, 2778 output: *std.ArrayList(u8), 2779 focus: *Focus, 2780 session: *ui.Session, 2781 root_focus: *Focus, 2782 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2783 ) !void { 2784 var iter = focus.children.iterator(); 2785 while (iter.next()) |entry| { 2786 const id = entry.key_ptr.*; 2787 if (excluded.contains(id)) continue; 2788 const child = entry.value_ptr.*; 2789 const r = child.rect; 2790 2791 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2792 2793 switch (child.focus.kind) { 2794 .text_input, .text_input_password, .text_area => { 2795 const ti = session.text_inputs.get(id) orelse continue; 2796 2797 const inner_left = r.x + 1; 2798 const inner_top = r.y + 1; 2799 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2800 const preserve = !ti.options.read_only; 2801 2802 if (child.focus.kind == .text_area) { 2803 const value = try ti.text(allocator); 2804 defer allocator.free(value); 2805 var id_buf: [128]u8 = undefined; 2806 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2807 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2808 try appendFormAttribute(allocator, output, root_focus, id); 2809 if (ti.options.name.len > 0) { 2810 try output.appendSlice(allocator, " name=\""); 2811 try appendEscapedHtml(allocator, output, ti.options.name); 2812 try output.append(allocator, '"'); 2813 } 2814 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2815 var pos_buf: [128]u8 = undefined; 2816 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 })); 2817 try appendEscapedHtml(allocator, output, value); 2818 try output.appendSlice(allocator, "</textarea>"); 2819 continue; 2820 } 2821 2822 var id_buf: [160]u8 = undefined; 2823 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 })); 2824 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2825 try appendFormAttribute(allocator, output, root_focus, id); 2826 if (ti.options.name.len > 0) { 2827 try output.appendSlice(allocator, " name=\""); 2828 try appendEscapedHtml(allocator, output, ti.options.name); 2829 try output.append(allocator, '"'); 2830 } 2831 if (child.focus.kind != .text_input_password) { 2832 const value = try ti.text(allocator); 2833 defer allocator.free(value); 2834 try output.appendSlice(allocator, " value=\""); 2835 try appendEscapedHtml(allocator, output, value); 2836 try output.append(allocator, '"'); 2837 } 2838 var pos_buf: [96]u8 = undefined; 2839 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 })); 2840 }, 2841 .custom => |custom| { 2842 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2843 if (formOwner(root_focus, id) == null) continue; 2844 var id_buf: [128]u8 = undefined; 2845 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2846 try appendFormAttribute(allocator, output, root_focus, id); 2847 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2848 try output.appendSlice(allocator, " formaction=\""); 2849 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2850 try output.append(allocator, '"'); 2851 } 2852 var pos_buf: [128]u8 = undefined; 2853 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 })); 2854 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2855 // an invisible native radio over the option, checked when the option is its row's selection 2856 const field = custom[ui.radio_prefix.len..]; 2857 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2858 const row = root_focus.children.get(child.parent_id) orelse continue; 2859 var id_buf: [128]u8 = undefined; 2860 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2861 try appendFormAttribute(allocator, output, root_focus, id); 2862 try output.appendSlice(allocator, " name=\""); 2863 try appendEscapedHtml(allocator, output, field[0..separator]); 2864 try output.appendSlice(allocator, "\" value=\""); 2865 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2866 try output.append(allocator, '"'); 2867 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2868 var pos_buf: [128]u8 = undefined; 2869 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 })); 2870 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2871 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2872 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2873 var id_buf: [128]u8 = undefined; 2874 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 })); 2875 } 2876 }, 2877 else => {}, 2878 } 2879 } 2880 } 2881 2882 // emit hidden form owners beside the rendered panels. their controls point 2883 // back here with the standard HTML `form` attribute. 2884 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2885 // the focus child map preserves insertion order, which matches the order 2886 // widgets were added in code 2887 var iter = root_focus.children.iterator(); 2888 while (iter.next()) |entry| { 2889 const child = entry.value_ptr.*; 2890 const action_url = formAction(child.focus) orelse continue; 2891 2892 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2893 var id_buf: [96]u8 = undefined; 2894 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2895 try appendEscapedHtml(allocator, output, action_url); 2896 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2897 } 2898 } 2899 2900 // the 16 ansi colors as the browser shows them (xterm's defaults) 2901 const ansi_palette = [16]Grid.Color.Rgb{ 2902 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2903 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2904 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2905 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2906 }; 2907 2908 // resolve any color to rgb: palette colors through the ansi table and the 2909 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2910 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2911 return switch (color) { 2912 .rgb => |c| c, 2913 .ansi => |a| ansi_palette[@backingInt(a)], 2914 .indexed => |n| if (n < 16) 2915 ansi_palette[n] 2916 else if (n < 232) blk: { 2917 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2918 const i = n - 16; 2919 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2920 } else blk: { 2921 const v: u8 = 8 + (n - 232) * 10; 2922 break :blk .{ .r = v, .g = v, .b = v }; 2923 }, 2924 }; 2925 } 2926 2927 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2928 // cell's style into `buf`, omitting whichever color is unset. an inverted 2929 // cell swaps the two, falling back to the page's --fg/--bg variables for 2930 // whichever side is unset. text attributes follow the colors. returns an 2931 // empty slice when nothing is set. 2932 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2933 if (style.eql(.{})) return buf[0..0]; 2934 const prefix = " style=\""; 2935 @memcpy(buf[0..prefix.len], prefix); 2936 var i: usize = prefix.len; 2937 const inverted = style.inverted; 2938 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2939 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2940 const decoration: []const u8 = if (style.underline and style.strikethrough) 2941 "text-decoration:underline line-through;" 2942 else if (style.underline) 2943 "text-decoration:underline;" 2944 else if (style.strikethrough) 2945 "text-decoration:line-through;" 2946 else 2947 ""; 2948 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2949 if (style.bold) "font-weight:bold;" else "", 2950 if (style.italic) "font-style:italic;" else "", 2951 decoration, 2952 if (style.dim) "opacity:.6;" else "", 2953 }) catch return buf[0..0]; 2954 i += attributes.len; 2955 if (i >= buf.len) return buf[0..0]; 2956 buf[i] = '"'; 2957 return buf[0 .. i + 1]; 2958 } 2959 2960 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2961 // the color is unset (nothing when both are). returns the new end, or null 2962 // when it doesn't fit. 2963 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2964 const s = if (color) |c| blk: { 2965 const v = colorRgb(c); 2966 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; 2967 } else if (fallback) |f| 2968 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2969 else 2970 return i; 2971 return i + s.len; 2972 } 2973 2974 // a cell's link as an href, when it's a page path or a web or mail url 2975 fn webLink(link: ?[]const u8) ?[]const u8 { 2976 const url = link orelse return null; 2977 // a page path, not a protocol-relative url 2978 if (url.len > 1 and url[0] == '/' and url[1] != '/') return url; 2979 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2980 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2981 } 2982 return null; 2983 } 2984 2985 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2986 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2987 return b == null; 2988 } 2989 2990 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2991 for (input) |ch| { 2992 switch (ch) { 2993 '&' => try out.appendSlice(allocator, "&amp;"), 2994 '<' => try out.appendSlice(allocator, "&lt;"), 2995 '>' => try out.appendSlice(allocator, "&gt;"), 2996 '"' => try out.appendSlice(allocator, "&quot;"), 2997 '\'' => try out.appendSlice(allocator, "&#39;"), 2998 else => try out.append(allocator, ch), 2999 } 3000 } 3001 } 3002 3003 // --- helpers -------------------------------------------------------------- 3004 3005 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 3006 var iter = request.iterateHeaders(); 3007 while (iter.next()) |header| { 3008 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 3009 var pairs = std.mem.splitScalar(u8, header.value, ';'); 3010 while (pairs.next()) |pair| { 3011 const trimmed = std.mem.trim(u8, pair, " \t"); 3012 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 3013 if (std.mem.eql(u8, trimmed[0..eq], name)) { 3014 return trimmed[eq + 1 ..]; 3015 } 3016 } 3017 } 3018 return null; 3019 } 3020 3021 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 3022 var iter = std.mem.splitScalar(u8, body, '&'); 3023 while (iter.next()) |pair| { 3024 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 3025 if (std.mem.eql(u8, pair[0..eq], key)) { 3026 return try decodeFormValue(allocator, pair[eq + 1 ..]); 3027 } 3028 } 3029 return null; 3030 } 3031 3032 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 3033 var buffer: [256]u8 = undefined; 3034 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 3035 } 3036 3037 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 3038 var out: std.ArrayList(u8) = .empty; 3039 errdefer out.deinit(allocator); 3040 var i: usize = 0; 3041 while (i < encoded.len) : (i += 1) { 3042 switch (encoded[i]) { 3043 '+' => try out.append(allocator, ' '), 3044 '%' => { 3045 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 3046 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 3047 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 3048 try out.append(allocator, hi * 16 + lo); 3049 i += 2; 3050 }, 3051 else => try out.append(allocator, encoded[i]), 3052 } 3053 } 3054 return try out.toOwnedSlice(allocator); 3055 } 3056 3057 // disk-backed web session store. each login mints a random, opaque token 3058 // (not the user's id) that is stored as a file named by the token hex, whose 3059 // contents are the raw user_id bytes. authenticating a request is a lookup of 3060 // the cookie's token; logout deletes the file, revoking the session. there is 3061 // deliberately no expiry — a session lives until logout. form failures use 3062 // files in the flash subdirectory that the redirected GET consumes. the 3063 // directory is cleared whenever the server starts. 3064 pub const SessionStore = struct { 3065 io: std.Io, 3066 dir: std.Io.Dir, 3067 flash_dir: std.Io.Dir, 3068 auto_login: ?[token_hex_len]u8, 3069 3070 pub const token_hex_len = evt.event_id_size * 2; 3071 3072 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 3073 try data_dir.createDirPath(io, "sessions"); 3074 const dir = try data_dir.openDir(io, "sessions", .{}); 3075 errdefer dir.close(io); 3076 try dir.deleteTree(io, "flash"); 3077 try dir.createDirPath(io, "flash"); 3078 const flash_dir = try dir.openDir(io, "flash", .{}); 3079 errdefer flash_dir.close(io); 3080 const auto_login = blk: { 3081 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 3082 defer file.close(io); 3083 var token: [token_hex_len]u8 = undefined; 3084 var storage: [token_hex_len]u8 = undefined; 3085 var reader = file.reader(io, &storage); 3086 reader.interface.readSliceAll(&token) catch break :blk null; 3087 break :blk token; 3088 }; 3089 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 3090 } 3091 3092 pub fn deinit(self: SessionStore) void { 3093 self.flash_dir.close(self.io); 3094 self.dir.close(self.io); 3095 } 3096 3097 // mint a new session for user_id, returning the token hex to set as the 3098 // cookie value. 3099 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 3100 var token: [evt.event_id_size]u8 = undefined; 3101 self.io.random(&token); 3102 const token_hex = std.fmt.bytesToHex(token, .lower); 3103 const file = try self.dir.createFile(self.io, &token_hex, .{}); 3104 defer file.close(self.io); 3105 try file.writeStreamingAll(self.io, user_id); 3106 return token_hex; 3107 } 3108 3109 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 3110 var token: [evt.event_id_size]u8 = undefined; 3111 self.io.random(&token); 3112 const token_hex = std.fmt.bytesToHex(token, .lower); 3113 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 3114 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 3115 defer file.close(self.io); 3116 3117 var json: std.Io.Writer.Allocating = .init(allocator); 3118 defer json.deinit(); 3119 try std.json.Stringify.value(value, .{}, &json.writer); 3120 try file.writeStreamingAll(self.io, json.written()); 3121 return token_hex; 3122 } 3123 3124 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 3125 if (!isToken(token_hex)) return null; 3126 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 3127 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 3128 defer file.close(self.io); 3129 3130 var storage: [4096]u8 = undefined; 3131 var reader = file.reader(self.io, &storage); 3132 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 3133 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 3134 } 3135 3136 // resolve a cookie's token to its user_id. returns false (logged out) for a 3137 // missing, malformed, or unknown token. 3138 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 3139 if (!isToken(token_hex)) return false; 3140 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 3141 defer file.close(self.io); 3142 var storage: [evt.event_id_size]u8 = undefined; 3143 var file_reader = file.reader(self.io, &storage); 3144 file_reader.interface.readSliceAll(out) catch return false; 3145 return true; 3146 } 3147 3148 // revoke a session. a no-op for a missing or malformed token. 3149 pub fn remove(self: SessionStore, token_hex: []const u8) void { 3150 if (!isToken(token_hex)) return; 3151 self.dir.deleteFile(self.io, token_hex) catch {}; 3152 } 3153 3154 // leave `token_hex`'s session for visitors arriving without one. only the 3155 // `try` fixture writes one. the name can't collide with a session token. 3156 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 3157 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 3158 defer file.close(self.io); 3159 try file.writeStreamingAll(self.io, token_hex); 3160 } 3161 3162 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 3163 out.* = self.auto_login orelse return false; 3164 return true; 3165 } 3166 3167 const auto_login_name = "auto-login"; 3168 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