╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭73ff1bca..╮ 73ff1bca.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (614) user
╭────╮ ╭ 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 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 │ ╰─────────────────────────────────╯
2062 // looking every focusable up for every cell is quadratic in a long list. 2063 const owners = try allocator.alloc(?usize, grid.size.width * grid.size.height); 2064 defer allocator.free(owners); 2065 @memset(owners, null); 2066 { 2067 var it = focus.children.iterator(); 2068 while (it.next()) |entry| { 2069 const child = entry.value_ptr.*; 2070 if (child.focus.mode != .all) continue; 2071 if (excluded.contains(entry.key_ptr.*)) continue; 2072 const r = child.rect; 2073 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2074 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2075 const owner = &owners[y * grid.size.width + x]; 2076 if (owner.* == null) owner.* = entry.key_ptr.*; 2077 } 2078 } 2079 } 2080 } 2081 2082 // the cells are the volatile part of a panel. js replaces this one subtree 2083 // wholesale while retaining the panel's native controls and scroll shells. 2084 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2085 2086 // emit this panel's grid as rows of text, coalescing adjacent cells that 2087 // share a focus id and style into one tag (a clickable span, a link, or a 2088 // plain styled span). cells under a child scroll keep only their background. 2089 // a cell's own link is an anchor nested in that tag. 2090 for (0..grid.size.height) |y| { 2091 var cur_id: ?usize = null; 2092 var cur_style: Grid.Style = .{}; 2093 var open_tag: ?CellTag = null; 2094 var open_link: ?[]const u8 = null; 2095 var first = true; 2096 for (0..grid.size.width) |x| { 2097 const cell = (try grid.cell(x, y)).*; 2098 // a cell covered by a child scroll's viewport is drawn by that scroll's 2099 // own div, so blank its glyph and make it non-clickable here — but keep 2100 // its background, so the backdrop still shows through the scroll's 2101 // transparent div instead of a bare hole. 2102 const covered_by_scroll = blk: { 2103 for (direct.items) |id| { 2104 const r = (focus.children.get(id) orelse continue).rect; 2105 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; 2106 } 2107 break :blk false; 2108 }; 2109 // the focusable owning the cell at (x, y); none for a covered cell. 2110 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2111 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2112 2113 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2114 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2115 open_link = null; 2116 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2117 2118 var new_tag: ?CellTag = null; 2119 if (cell_id) |id| { 2120 if (focus.children.get(id)) |child| { 2121 new_tag = switch (child.focus.kind) { 2122 .custom => |custom| CellTag.init(custom), 2123 else => .span, 2124 }; 2125 } 2126 } 2127 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2128 2129 if (new_tag) |t| { 2130 var style_buf: [192]u8 = undefined; 2131 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2132 } 2133 2134 open_tag = new_tag; 2135 cur_id = cell_id; 2136 cur_style = style; 2137 first = false; 2138 } 2139 2140 // an anchor can't nest in another, so a link tag's cells skip theirs 2141 const in_anchor = if (open_tag) |t| t == .a else false; 2142 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2143 if (!sameLink(link, open_link)) { 2144 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2145 if (link) |url| { 2146 try output.appendSlice(allocator, "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2147 try appendEscapedHtml(allocator, output, url); 2148 try output.appendSlice(allocator, "\">"); 2149 } 2150 open_link = link; 2151 } 2152 2153 if (covered_by_scroll) { 2154 try appendEscapedHtml(allocator, output, " "); 2155 } else if (cell.continuation) { 2156 // the wide rune to the left was emitted 2ch wide, covering this column 2157 } else if (cell.rune) |rune| { 2158 var encoded: [4]u8 = undefined; 2159 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2160 const rune_text = encoded[0..encoded_len]; 2161 // a double-width rune is pinned inside a 2ch span so the 2162 // fallback glyph's advance width can't shift the rest of the row 2163 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2164 if (wide) { 2165 try output.appendSlice(allocator, "<span class=\"w2\">"); 2166 try appendEscapedHtml(allocator, output, rune_text); 2167 try output.appendSlice(allocator, "</span>"); 2168 } else { 2169 try appendEscapedHtml(allocator, output, rune_text); 2170 } 2171 } else { 2172 try appendEscapedHtml(allocator, output, " "); 2173 } 2174 } 2175 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2176 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2177 try output.append(allocator, '\n'); 2178 } 2179 try output.appendSlice(allocator, "</div>"); 2180 2181 // native controls live in their panel, beside the replaceable cells. their 2182 // stable keys let JS update layout without recreating their DOM nodes, and 2183 // being actual descendants of a scroll gives them native movement/clipping. 2184 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2185 2186 // each child scroll becomes a natively-scrollable div positioned over its 2187 // viewport, holding its full content rendered recursively. 2188 for (direct.items) |id| { 2189 const child = focus.children.get(id) orelse continue; 2190 const info = child.focus.scroll orelse continue; 2191 const r = child.rect; 2192 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2193 // when that axis actually overflows. the other axis is clipped (hidden), 2194 // matching how the terminal Scroll handles its non-scrolling axis. 2195 const overflow = switch (info.direction) { 2196 .vert => "overflow-x:hidden;overflow-y:auto", 2197 .horiz => "overflow-x:auto;overflow-y:hidden", 2198 .both => "overflow:auto", 2199 }; 2200 // the id carries a content version so JS preserves the native scroll 2201 // position across re-renders of the same content but resets it when the 2202 // content is replaced — e.g. selecting a different commit. the widget's 2203 // scroll offset (in cells) rides along so JS can apply it when it has no 2204 // preserved position, letting a wasm-side scrollToRect (the files list 2205 // scrolling to its selected row on page load) reach the browser. 2206 var buf: [256]u8 = undefined; 2207 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 })); 2208 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2209 try output.appendSlice(allocator, "</div>"); 2210 } 2211 } 2212 2213 const form_prefix = "form:"; 2214 const form_id_prefix = "haxy-form-"; 2215 2216 fn formAction(focus: *const Focus) ?[]const u8 { 2217 return switch (focus.kind) { 2218 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2219 else => null, 2220 }; 2221 } 2222 2223 // find the form ancestor of a flattened focus-tree child. html's `form` 2224 // attribute then associates the control with that form without requiring the 2225 // form and control to share a DOM parent. 2226 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2227 var id = focus_id; 2228 while (root_focus.children.get(id)) |child| { 2229 const parent_id = child.parent_id; 2230 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2231 const parent = root_focus.children.get(parent_id) orelse return null; 2232 if (formAction(parent.focus) != null) return parent_id; 2233 id = parent_id; 2234 } 2235 return null; 2236 } 2237 2238 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2239 const form_id = formOwner(root_focus, focus_id) orelse return; 2240 var buf: [64]u8 = undefined; 2241 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2242 } 2243 2244 fn renderPanelControls( 2245 allocator: std.mem.Allocator, 2246 output: *std.ArrayList(u8), 2247 focus: *Focus, 2248 session: *ui.Session, 2249 root_focus: *Focus, 2250 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2251 ) !void { 2252 var iter = focus.children.iterator(); 2253 while (iter.next()) |entry| { 2254 const id = entry.key_ptr.*; 2255 if (excluded.contains(id)) continue; 2256 const child = entry.value_ptr.*; 2257 const r = child.rect; 2258 2259 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2260 2261 switch (child.focus.kind) { 2262 .text_input, .text_input_password, .text_area => { 2263 const ti = session.text_inputs.get(id) orelse continue; 2264 2265 const inner_left = r.x + 1; 2266 const inner_top = r.y + 1; 2267 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2268 const preserve = !ti.options.read_only; 2269 2270 if (child.focus.kind == .text_area) { 2271 const value = try ti.text(allocator); 2272 defer allocator.free(value); 2273 var id_buf: [128]u8 = undefined; 2274 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2275 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2276 try appendFormAttribute(allocator, output, root_focus, id); 2277 if (ti.options.name.len > 0) { 2278 try output.appendSlice(allocator, " name=\""); 2279 try appendEscapedHtml(allocator, output, ti.options.name); 2280 try output.append(allocator, '"'); 2281 } 2282 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2283 var pos_buf: [128]u8 = undefined; 2284 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 })); 2285 try appendEscapedHtml(allocator, output, value); 2286 try output.appendSlice(allocator, "</textarea>"); 2287 continue; 2288 } 2289 2290 var id_buf: [160]u8 = undefined; 2291 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 })); 2292 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2293 try appendFormAttribute(allocator, output, root_focus, id); 2294 if (ti.options.name.len > 0) { 2295 try output.appendSlice(allocator, " name=\""); 2296 try appendEscapedHtml(allocator, output, ti.options.name); 2297 try output.append(allocator, '"'); 2298 } 2299 if (child.focus.kind != .text_input_password) { 2300 const value = try ti.text(allocator); 2301 defer allocator.free(value); 2302 try output.appendSlice(allocator, " value=\""); 2303 try appendEscapedHtml(allocator, output, value); 2304 try output.append(allocator, '"'); 2305 } 2306 var pos_buf: [96]u8 = undefined; 2307 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 })); 2308 }, 2309 .custom => |custom| { 2310 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2311 if (formOwner(root_focus, id) == null) continue; 2312 var id_buf: [128]u8 = undefined; 2313 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2314 try appendFormAttribute(allocator, output, root_focus, id); 2315 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2316 try output.appendSlice(allocator, " formaction=\""); 2317 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2318 try output.append(allocator, '"'); 2319 } 2320 var pos_buf: [128]u8 = undefined; 2321 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 })); 2322 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2323 // an invisible native radio over the option, checked when the option is its row's selection 2324 const field = custom[ui.radio_prefix.len..]; 2325 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2326 const row = root_focus.children.get(child.parent_id) orelse continue; 2327 var id_buf: [128]u8 = undefined; 2328 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2329 try appendFormAttribute(allocator, output, root_focus, id); 2330 try output.appendSlice(allocator, " name=\""); 2331 try appendEscapedHtml(allocator, output, field[0..separator]); 2332 try output.appendSlice(allocator, "\" value=\""); 2333 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2334 try output.append(allocator, '"'); 2335 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2336 var pos_buf: [128]u8 = undefined; 2337 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 })); 2338 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2339 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2340 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2341 var id_buf: [128]u8 = undefined; 2342 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 })); 2343 } 2344 }, 2345 else => {}, 2346 } 2347 } 2348 } 2349 2350 // emit hidden form owners beside the rendered panels. their controls point 2351 // back here with the standard HTML `form` attribute. 2352 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2353 // the focus child map preserves insertion order, which matches the order 2354 // widgets were added in code 2355 var iter = root_focus.children.iterator(); 2356 while (iter.next()) |entry| { 2357 const child = entry.value_ptr.*; 2358 const action_url = formAction(child.focus) orelse continue; 2359 2360 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2361 var id_buf: [96]u8 = undefined; 2362 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2363 try appendEscapedHtml(allocator, output, action_url); 2364 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2365 } 2366 } 2367 2368 // the 16 ansi colors as the browser shows them (xterm's defaults) 2369 const ansi_palette = [16]Grid.Color.Rgb{ 2370 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2371 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2372 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2373 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2374 }; 2375 2376 // resolve any color to rgb: palette colors through the ansi table and the 2377 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2378 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2379 return switch (color) { 2380 .rgb => |c| c, 2381 .ansi => |a| ansi_palette[@intFromEnum(a)], 2382 .indexed => |n| if (n < 16) 2383 ansi_palette[n] 2384 else if (n < 232) blk: { 2385 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2386 const i = n - 16; 2387 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2388 } else blk: { 2389 const v: u8 = 8 + (n - 232) * 10; 2390 break :blk .{ .r = v, .g = v, .b = v }; 2391 }, 2392 }; 2393 } 2394 2395 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2396 // cell's style into `buf`, omitting whichever color is unset. an inverted 2397 // cell swaps the two, falling back to the page's --fg/--bg variables for 2398 // whichever side is unset. text attributes follow the colors. returns an 2399 // empty slice when nothing is set. 2400 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2401 if (style.eql(.{})) return buf[0..0]; 2402 const prefix = " style=\""; 2403 @memcpy(buf[0..prefix.len], prefix); 2404 var i: usize = prefix.len; 2405 const inverted = style.inverted; 2406 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2407 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2408 const decoration: []const u8 = if (style.underline and style.strikethrough) 2409 "text-decoration:underline line-through;" 2410 else if (style.underline) 2411 "text-decoration:underline;" 2412 else if (style.strikethrough) 2413 "text-decoration:line-through;" 2414 else 2415 ""; 2416 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2417 if (style.bold) "font-weight:bold;" else "", 2418 if (style.italic) "font-style:italic;" else "", 2419 decoration, 2420 if (style.dim) "opacity:.6;" else "", 2421 }) catch return buf[0..0]; 2422 i += attributes.len; 2423 if (i >= buf.len) return buf[0..0]; 2424 buf[i] = '"'; 2425 return buf[0 .. i + 1]; 2426 } 2427 2428 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2429 // the color is unset (nothing when both are). returns the new end, or null 2430 // when it doesn't fit. 2431 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2432 const s = if (color) |c| blk: { 2433 const v = colorRgb(c); 2434 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; 2435 } else if (fallback) |f| 2436 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2437 else 2438 return i; 2439 return i + s.len; 2440 } 2441 2442 // a cell's link as an href, when it's a web or mail url 2443 fn webLink(link: ?[]const u8) ?[]const u8 { 2444 const url = link orelse return null; 2445 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2446 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2447 } 2448 return null; 2449 } 2450 2451 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2452 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2453 return b == null; 2454 } 2455 2456 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2457 for (input) |ch| { 2458 switch (ch) { 2459 '&' => try out.appendSlice(allocator, "&amp;"), 2460 '<' => try out.appendSlice(allocator, "&lt;"), 2461 '>' => try out.appendSlice(allocator, "&gt;"), 2462 '"' => try out.appendSlice(allocator, "&quot;"), 2463 '\'' => try out.appendSlice(allocator, "&#39;"), 2464 else => try out.append(allocator, ch), 2465 } 2466 } 2467 } 2468 2469 // --- helpers -------------------------------------------------------------- 2470 2471 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2472 var iter = request.iterateHeaders(); 2473 while (iter.next()) |header| { 2474 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2475 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2476 while (pairs.next()) |pair| { 2477 const trimmed = std.mem.trim(u8, pair, " \t"); 2478 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2479 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2480 return trimmed[eq + 1 ..]; 2481 } 2482 } 2483 } 2484 return null; 2485 } 2486 2487 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2488 var iter = std.mem.splitScalar(u8, body, '&'); 2489 while (iter.next()) |pair| { 2490 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2491 if (std.mem.eql(u8, pair[0..eq], key)) { 2492 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2493 } 2494 } 2495 return null; 2496 } 2497 2498 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2499 var buffer: [256]u8 = undefined; 2500 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2501 } 2502 2503 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2504 var out: std.ArrayList(u8) = .empty; 2505 errdefer out.deinit(allocator); 2506 var i: usize = 0; 2507 while (i < encoded.len) : (i += 1) { 2508 switch (encoded[i]) { 2509 '+' => try out.append(allocator, ' '), 2510 '%' => { 2511 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2512 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2513 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2514 try out.append(allocator, hi * 16 + lo); 2515 i += 2; 2516 }, 2517 else => try out.append(allocator, encoded[i]), 2518 } 2519 } 2520 return try out.toOwnedSlice(allocator); 2521 } 2522 2523 // disk-backed web session store. each login mints a random, opaque token 2524 // (not the user's id) that is stored as a file named by the token hex, whose 2525 // contents are the raw user_id bytes. authenticating a request is a lookup of 2526 // the cookie's token; logout deletes the file, revoking the session. there is 2527 // deliberately no expiry — a session lives until logout. form failures use 2528 // files in the flash subdirectory that the redirected GET consumes. the 2529 // directory is cleared whenever the server starts. 2530 pub const SessionStore = struct { 2531 io: std.Io, 2532 dir: std.Io.Dir, 2533 flash_dir: std.Io.Dir, 2534 auto_login: ?[token_hex_len]u8, 2535 2536 pub const token_hex_len = evt.event_id_size * 2; 2537 2538 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2539 try data_dir.createDirPath(io, "sessions"); 2540 const dir = try data_dir.openDir(io, "sessions", .{}); 2541 errdefer dir.close(io); 2542 try dir.deleteTree(io, "flash"); 2543 try dir.createDirPath(io, "flash"); 2544 const flash_dir = try dir.openDir(io, "flash", .{}); 2545 errdefer flash_dir.close(io); 2546 const auto_login = blk: { 2547 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2548 defer file.close(io); 2549 var token: [token_hex_len]u8 = undefined; 2550 var storage: [token_hex_len]u8 = undefined; 2551 var reader = file.reader(io, &storage); 2552 reader.interface.readSliceAll(&token) catch break :blk null; 2553 break :blk token; 2554 }; 2555 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2556 } 2557 2558 pub fn deinit(self: SessionStore) void { 2559 self.flash_dir.close(self.io); 2560 self.dir.close(self.io); 2561 } 2562 2563 // mint a new session for user_id, returning the token hex to set as the 2564 // cookie value. 2565 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2566 var token: [evt.event_id_size]u8 = undefined; 2567 self.io.random(&token); 2568 const token_hex = std.fmt.bytesToHex(token, .lower); 2569 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2570 defer file.close(self.io); 2571 try file.writeStreamingAll(self.io, user_id); 2572 return token_hex; 2573 } 2574 2575 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2576 var token: [evt.event_id_size]u8 = undefined; 2577 self.io.random(&token); 2578 const token_hex = std.fmt.bytesToHex(token, .lower); 2579 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2580 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2581 defer file.close(self.io); 2582 2583 var json: std.Io.Writer.Allocating = .init(allocator); 2584 defer json.deinit(); 2585 try std.json.Stringify.value(value, .{}, &json.writer); 2586 try file.writeStreamingAll(self.io, json.written()); 2587 return token_hex; 2588 } 2589 2590 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2591 if (!isToken(token_hex)) return null; 2592 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2593 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2594 defer file.close(self.io); 2595 2596 var storage: [4096]u8 = undefined; 2597 var reader = file.reader(self.io, &storage); 2598 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2599 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2600 } 2601 2602 // resolve a cookie's token to its user_id. returns false (logged out) for a 2603 // missing, malformed, or unknown token. 2604 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2605 if (!isToken(token_hex)) return false; 2606 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2607 defer file.close(self.io); 2608 var storage: [evt.event_id_size]u8 = undefined; 2609 var file_reader = file.reader(self.io, &storage); 2610 file_reader.interface.readSliceAll(out) catch return false; 2611 return true; 2612 } 2613 2614 // revoke a session. a no-op for a missing or malformed token. 2615 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2616 if (!isToken(token_hex)) return; 2617 self.dir.deleteFile(self.io, token_hex) catch {}; 2618 } 2619 2620 // leave `token_hex`'s session for visitors arriving without one. only the 2621 // `try` fixture writes one. the name can't collide with a session token. 2622 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2623 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2624 defer file.close(self.io); 2625 try file.writeStreamingAll(self.io, token_hex); 2626 } 2627 2628 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2629 out.* = self.auto_login orelse return false; 2630 return true; 2631 } 2632 2633 const auto_login_name = "auto-login"; 2634 2635 // a token is exactly token_hex_len hex chars. validating before using the 2636 // value as a path keeps attacker-supplied cookies from escaping the 2637 // sessions dir (e.g. via "/" or ".." bytes). 2638 fn isToken(token_hex: []const u8) bool { 2639 if (token_hex.len != token_hex_len) return false; 2640 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2641 return true; 2642 } 2643 }; 2644