╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭7fcb7c5a..╮ 7fcb7c5a.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (647) 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 │ ╰─────────────────────────────────╯
2159 defer allocator.free(owners); 2160 @memset(owners, null); 2161 { 2162 var it = focus.children.iterator(); 2163 while (it.next()) |entry| { 2164 const child = entry.value_ptr.*; 2165 if (child.focus.mode != .all) continue; 2166 if (excluded.contains(entry.key_ptr.*)) continue; 2167 const r = child.rect; 2168 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2169 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2170 const owner = &owners[y * grid.size.width + x]; 2171 if (owner.* == null) owner.* = entry.key_ptr.*; 2172 } 2173 } 2174 } 2175 } 2176 2177 // the cells are the volatile part of a panel. js replaces this one subtree 2178 // wholesale while retaining the panel's native controls and scroll shells. 2179 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2180 2181 // emit this panel's grid as rows of text, coalescing adjacent cells that 2182 // share a focus id and style into one tag (a clickable span, a link, or a 2183 // plain styled span). cells under a child scroll keep only their background. 2184 // a cell's own link is an anchor nested in that tag. 2185 for (0..grid.size.height) |y| { 2186 var cur_id: ?usize = null; 2187 var cur_style: Grid.Style = .{}; 2188 var open_tag: ?CellTag = null; 2189 var open_link: ?[]const u8 = null; 2190 var first = true; 2191 for (0..grid.size.width) |x| { 2192 const cell = (try grid.cell(x, y)).*; 2193 // a cell covered by a child scroll's viewport is drawn by that scroll's 2194 // own div, so blank its glyph and make it non-clickable here — but keep 2195 // its background, so the backdrop still shows through the scroll's 2196 // transparent div instead of a bare hole. 2197 const covered_by_scroll = blk: { 2198 for (direct.items) |id| { 2199 const r = (focus.children.get(id) orelse continue).rect; 2200 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; 2201 } 2202 break :blk false; 2203 }; 2204 // the focusable owning the cell at (x, y); none for a covered cell. 2205 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2206 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2207 2208 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2209 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2210 open_link = null; 2211 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2212 2213 var new_tag: ?CellTag = null; 2214 if (cell_id) |id| { 2215 if (focus.children.get(id)) |child| { 2216 new_tag = switch (child.focus.kind) { 2217 .custom => |custom| CellTag.init(custom), 2218 else => .span, 2219 }; 2220 } 2221 } 2222 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2223 2224 if (new_tag) |t| { 2225 var style_buf: [192]u8 = undefined; 2226 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2227 } 2228 2229 open_tag = new_tag; 2230 cur_id = cell_id; 2231 cur_style = style; 2232 first = false; 2233 } 2234 2235 // an anchor can't nest in another, so a link tag's cells skip theirs 2236 const in_anchor = if (open_tag) |t| t == .a else false; 2237 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2238 if (!sameLink(link, open_link)) { 2239 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2240 if (link) |url| { 2241 // a page path opens in this tab, any other url in a new one 2242 try output.appendSlice(allocator, if (url[0] == '/') 2243 "<a class=\"cell-link\" tabindex=\"-1\" href=\"" 2244 else 2245 "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2246 try appendEscapedHtml(allocator, output, url); 2247 try output.appendSlice(allocator, "\">"); 2248 } 2249 open_link = link; 2250 } 2251 2252 if (covered_by_scroll) { 2253 try appendEscapedHtml(allocator, output, " "); 2254 } else if (cell.continuation) { 2255 // the wide rune to the left was emitted 2ch wide, covering this column 2256 } else if (cell.rune) |rune| { 2257 var encoded: [4]u8 = undefined; 2258 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2259 const rune_text = encoded[0..encoded_len]; 2260 // a double-width rune is pinned inside a 2ch span so the 2261 // fallback glyph's advance width can't shift the rest of the row 2262 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2263 if (wide) { 2264 try output.appendSlice(allocator, "<span class=\"w2\">"); 2265 try appendEscapedHtml(allocator, output, rune_text); 2266 try output.appendSlice(allocator, "</span>"); 2267 } else { 2268 try appendEscapedHtml(allocator, output, rune_text); 2269 } 2270 } else { 2271 try appendEscapedHtml(allocator, output, " "); 2272 } 2273 } 2274 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2275 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2276 try output.append(allocator, '\n'); 2277 } 2278 try output.appendSlice(allocator, "</div>"); 2279 2280 // native controls live in their panel, beside the replaceable cells. their 2281 // stable keys let JS update layout without recreating their DOM nodes, and 2282 // being actual descendants of a scroll gives them native movement/clipping. 2283 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2284 2285 // each child scroll becomes a natively-scrollable div positioned over its 2286 // viewport, holding its full content rendered recursively. 2287 for (direct.items) |id| { 2288 const child = focus.children.get(id) orelse continue; 2289 const info = child.focus.scroll orelse continue; 2290 const r = child.rect; 2291 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2292 // when that axis actually overflows. the other axis is clipped (hidden), 2293 // matching how the terminal Scroll handles its non-scrolling axis. 2294 const overflow = switch (info.direction) { 2295 .vert => "overflow-x:hidden;overflow-y:auto", 2296 .horiz => "overflow-x:auto;overflow-y:hidden", 2297 .both => "overflow:auto", 2298 }; 2299 // the id carries a content version so JS preserves the native scroll 2300 // position across re-renders of the same content but resets it when the 2301 // content is replaced — e.g. selecting a different commit. the widget's 2302 // scroll offset (in cells) rides along so JS can apply it when it has no 2303 // preserved position, letting a wasm-side scrollToRect (the files list 2304 // scrolling to its selected row on page load) reach the browser. 2305 var buf: [256]u8 = undefined; 2306 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 })); 2307 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2308 try output.appendSlice(allocator, "</div>"); 2309 } 2310 } 2311 2312 const form_prefix = "form:"; 2313 const form_id_prefix = "haxy-form-"; 2314 2315 fn formAction(focus: *const Focus) ?[]const u8 { 2316 return switch (focus.kind) { 2317 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2318 else => null, 2319 }; 2320 } 2321 2322 // find the form ancestor of a flattened focus-tree child. html's `form` 2323 // attribute then associates the control with that form without requiring the 2324 // form and control to share a DOM parent. 2325 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2326 var id = focus_id; 2327 while (root_focus.children.get(id)) |child| { 2328 const parent_id = child.parent_id; 2329 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2330 const parent = root_focus.children.get(parent_id) orelse return null; 2331 if (formAction(parent.focus) != null) return parent_id; 2332 id = parent_id; 2333 } 2334 return null; 2335 } 2336 2337 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2338 const form_id = formOwner(root_focus, focus_id) orelse return; 2339 var buf: [64]u8 = undefined; 2340 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2341 } 2342 2343 fn renderPanelControls( 2344 allocator: std.mem.Allocator, 2345 output: *std.ArrayList(u8), 2346 focus: *Focus, 2347 session: *ui.Session, 2348 root_focus: *Focus, 2349 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2350 ) !void { 2351 var iter = focus.children.iterator(); 2352 while (iter.next()) |entry| { 2353 const id = entry.key_ptr.*; 2354 if (excluded.contains(id)) continue; 2355 const child = entry.value_ptr.*; 2356 const r = child.rect; 2357 2358 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2359 2360 switch (child.focus.kind) { 2361 .text_input, .text_input_password, .text_area => { 2362 const ti = session.text_inputs.get(id) orelse continue; 2363 2364 const inner_left = r.x + 1; 2365 const inner_top = r.y + 1; 2366 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2367 const preserve = !ti.options.read_only; 2368 2369 if (child.focus.kind == .text_area) { 2370 const value = try ti.text(allocator); 2371 defer allocator.free(value); 2372 var id_buf: [128]u8 = undefined; 2373 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2374 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2375 try appendFormAttribute(allocator, output, root_focus, id); 2376 if (ti.options.name.len > 0) { 2377 try output.appendSlice(allocator, " name=\""); 2378 try appendEscapedHtml(allocator, output, ti.options.name); 2379 try output.append(allocator, '"'); 2380 } 2381 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2382 var pos_buf: [128]u8 = undefined; 2383 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 })); 2384 try appendEscapedHtml(allocator, output, value); 2385 try output.appendSlice(allocator, "</textarea>"); 2386 continue; 2387 } 2388 2389 var id_buf: [160]u8 = undefined; 2390 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 })); 2391 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2392 try appendFormAttribute(allocator, output, root_focus, id); 2393 if (ti.options.name.len > 0) { 2394 try output.appendSlice(allocator, " name=\""); 2395 try appendEscapedHtml(allocator, output, ti.options.name); 2396 try output.append(allocator, '"'); 2397 } 2398 if (child.focus.kind != .text_input_password) { 2399 const value = try ti.text(allocator); 2400 defer allocator.free(value); 2401 try output.appendSlice(allocator, " value=\""); 2402 try appendEscapedHtml(allocator, output, value); 2403 try output.append(allocator, '"'); 2404 } 2405 var pos_buf: [96]u8 = undefined; 2406 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 })); 2407 }, 2408 .custom => |custom| { 2409 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2410 if (formOwner(root_focus, id) == null) continue; 2411 var id_buf: [128]u8 = undefined; 2412 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2413 try appendFormAttribute(allocator, output, root_focus, id); 2414 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2415 try output.appendSlice(allocator, " formaction=\""); 2416 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2417 try output.append(allocator, '"'); 2418 } 2419 var pos_buf: [128]u8 = undefined; 2420 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 })); 2421 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2422 // an invisible native radio over the option, checked when the option is its row's selection 2423 const field = custom[ui.radio_prefix.len..]; 2424 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2425 const row = root_focus.children.get(child.parent_id) orelse continue; 2426 var id_buf: [128]u8 = undefined; 2427 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2428 try appendFormAttribute(allocator, output, root_focus, id); 2429 try output.appendSlice(allocator, " name=\""); 2430 try appendEscapedHtml(allocator, output, field[0..separator]); 2431 try output.appendSlice(allocator, "\" value=\""); 2432 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2433 try output.append(allocator, '"'); 2434 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2435 var pos_buf: [128]u8 = undefined; 2436 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 })); 2437 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2438 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2439 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2440 var id_buf: [128]u8 = undefined; 2441 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 })); 2442 } 2443 }, 2444 else => {}, 2445 } 2446 } 2447 } 2448 2449 // emit hidden form owners beside the rendered panels. their controls point 2450 // back here with the standard HTML `form` attribute. 2451 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2452 // the focus child map preserves insertion order, which matches the order 2453 // widgets were added in code 2454 var iter = root_focus.children.iterator(); 2455 while (iter.next()) |entry| { 2456 const child = entry.value_ptr.*; 2457 const action_url = formAction(child.focus) orelse continue; 2458 2459 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2460 var id_buf: [96]u8 = undefined; 2461 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2462 try appendEscapedHtml(allocator, output, action_url); 2463 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2464 } 2465 } 2466 2467 // the 16 ansi colors as the browser shows them (xterm's defaults) 2468 const ansi_palette = [16]Grid.Color.Rgb{ 2469 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2470 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2471 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2472 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2473 }; 2474 2475 // resolve any color to rgb: palette colors through the ansi table and the 2476 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2477 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2478 return switch (color) { 2479 .rgb => |c| c, 2480 .ansi => |a| ansi_palette[@backingInt(a)], 2481 .indexed => |n| if (n < 16) 2482 ansi_palette[n] 2483 else if (n < 232) blk: { 2484 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2485 const i = n - 16; 2486 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2487 } else blk: { 2488 const v: u8 = 8 + (n - 232) * 10; 2489 break :blk .{ .r = v, .g = v, .b = v }; 2490 }, 2491 }; 2492 } 2493 2494 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2495 // cell's style into `buf`, omitting whichever color is unset. an inverted 2496 // cell swaps the two, falling back to the page's --fg/--bg variables for 2497 // whichever side is unset. text attributes follow the colors. returns an 2498 // empty slice when nothing is set. 2499 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2500 if (style.eql(.{})) return buf[0..0]; 2501 const prefix = " style=\""; 2502 @memcpy(buf[0..prefix.len], prefix); 2503 var i: usize = prefix.len; 2504 const inverted = style.inverted; 2505 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2506 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2507 const decoration: []const u8 = if (style.underline and style.strikethrough) 2508 "text-decoration:underline line-through;" 2509 else if (style.underline) 2510 "text-decoration:underline;" 2511 else if (style.strikethrough) 2512 "text-decoration:line-through;" 2513 else 2514 ""; 2515 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2516 if (style.bold) "font-weight:bold;" else "", 2517 if (style.italic) "font-style:italic;" else "", 2518 decoration, 2519 if (style.dim) "opacity:.6;" else "", 2520 }) catch return buf[0..0]; 2521 i += attributes.len; 2522 if (i >= buf.len) return buf[0..0]; 2523 buf[i] = '"'; 2524 return buf[0 .. i + 1]; 2525 } 2526 2527 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2528 // the color is unset (nothing when both are). returns the new end, or null 2529 // when it doesn't fit. 2530 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2531 const s = if (color) |c| blk: { 2532 const v = colorRgb(c); 2533 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; 2534 } else if (fallback) |f| 2535 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2536 else 2537 return i; 2538 return i + s.len; 2539 } 2540 2541 // a cell's link as an href, when it's a page path or a web or mail url 2542 fn webLink(link: ?[]const u8) ?[]const u8 { 2543 const url = link orelse return null; 2544 // a page path, not a protocol-relative url 2545 if (url.len > 1 and url[0] == '/' and url[1] != '/') return url; 2546 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2547 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2548 } 2549 return null; 2550 } 2551 2552 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2553 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2554 return b == null; 2555 } 2556 2557 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2558 for (input) |ch| { 2559 switch (ch) { 2560 '&' => try out.appendSlice(allocator, "&amp;"), 2561 '<' => try out.appendSlice(allocator, "&lt;"), 2562 '>' => try out.appendSlice(allocator, "&gt;"), 2563 '"' => try out.appendSlice(allocator, "&quot;"), 2564 '\'' => try out.appendSlice(allocator, "&#39;"), 2565 else => try out.append(allocator, ch), 2566 } 2567 } 2568 } 2569 2570 // --- helpers -------------------------------------------------------------- 2571 2572 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2573 var iter = request.iterateHeaders(); 2574 while (iter.next()) |header| { 2575 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2576 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2577 while (pairs.next()) |pair| { 2578 const trimmed = std.mem.trim(u8, pair, " \t"); 2579 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2580 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2581 return trimmed[eq + 1 ..]; 2582 } 2583 } 2584 } 2585 return null; 2586 } 2587 2588 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2589 var iter = std.mem.splitScalar(u8, body, '&'); 2590 while (iter.next()) |pair| { 2591 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2592 if (std.mem.eql(u8, pair[0..eq], key)) { 2593 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2594 } 2595 } 2596 return null; 2597 } 2598 2599 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2600 var buffer: [256]u8 = undefined; 2601 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2602 } 2603 2604 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2605 var out: std.ArrayList(u8) = .empty; 2606 errdefer out.deinit(allocator); 2607 var i: usize = 0; 2608 while (i < encoded.len) : (i += 1) { 2609 switch (encoded[i]) { 2610 '+' => try out.append(allocator, ' '), 2611 '%' => { 2612 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2613 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2614 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2615 try out.append(allocator, hi * 16 + lo); 2616 i += 2; 2617 }, 2618 else => try out.append(allocator, encoded[i]), 2619 } 2620 } 2621 return try out.toOwnedSlice(allocator); 2622 } 2623 2624 // disk-backed web session store. each login mints a random, opaque token 2625 // (not the user's id) that is stored as a file named by the token hex, whose 2626 // contents are the raw user_id bytes. authenticating a request is a lookup of 2627 // the cookie's token; logout deletes the file, revoking the session. there is 2628 // deliberately no expiry — a session lives until logout. form failures use 2629 // files in the flash subdirectory that the redirected GET consumes. the 2630 // directory is cleared whenever the server starts. 2631 pub const SessionStore = struct { 2632 io: std.Io, 2633 dir: std.Io.Dir, 2634 flash_dir: std.Io.Dir, 2635 auto_login: ?[token_hex_len]u8, 2636 2637 pub const token_hex_len = evt.event_id_size * 2; 2638 2639 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2640 try data_dir.createDirPath(io, "sessions"); 2641 const dir = try data_dir.openDir(io, "sessions", .{}); 2642 errdefer dir.close(io); 2643 try dir.deleteTree(io, "flash"); 2644 try dir.createDirPath(io, "flash"); 2645 const flash_dir = try dir.openDir(io, "flash", .{}); 2646 errdefer flash_dir.close(io); 2647 const auto_login = blk: { 2648 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2649 defer file.close(io); 2650 var token: [token_hex_len]u8 = undefined; 2651 var storage: [token_hex_len]u8 = undefined; 2652 var reader = file.reader(io, &storage); 2653 reader.interface.readSliceAll(&token) catch break :blk null; 2654 break :blk token; 2655 }; 2656 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2657 } 2658 2659 pub fn deinit(self: SessionStore) void { 2660 self.flash_dir.close(self.io); 2661 self.dir.close(self.io); 2662 } 2663 2664 // mint a new session for user_id, returning the token hex to set as the 2665 // cookie value. 2666 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2667 var token: [evt.event_id_size]u8 = undefined; 2668 self.io.random(&token); 2669 const token_hex = std.fmt.bytesToHex(token, .lower); 2670 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2671 defer file.close(self.io); 2672 try file.writeStreamingAll(self.io, user_id); 2673 return token_hex; 2674 } 2675 2676 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2677 var token: [evt.event_id_size]u8 = undefined; 2678 self.io.random(&token); 2679 const token_hex = std.fmt.bytesToHex(token, .lower); 2680 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2681 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2682 defer file.close(self.io); 2683 2684 var json: std.Io.Writer.Allocating = .init(allocator); 2685 defer json.deinit(); 2686 try std.json.Stringify.value(value, .{}, &json.writer); 2687 try file.writeStreamingAll(self.io, json.written()); 2688 return token_hex; 2689 } 2690 2691 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2692 if (!isToken(token_hex)) return null; 2693 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2694 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2695 defer file.close(self.io); 2696 2697 var storage: [4096]u8 = undefined; 2698 var reader = file.reader(self.io, &storage); 2699 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2700 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2701 } 2702 2703 // resolve a cookie's token to its user_id. returns false (logged out) for a 2704 // missing, malformed, or unknown token. 2705 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2706 if (!isToken(token_hex)) return false; 2707 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2708 defer file.close(self.io); 2709 var storage: [evt.event_id_size]u8 = undefined; 2710 var file_reader = file.reader(self.io, &storage); 2711 file_reader.interface.readSliceAll(out) catch return false; 2712 return true; 2713 } 2714 2715 // revoke a session. a no-op for a missing or malformed token. 2716 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2717 if (!isToken(token_hex)) return; 2718 self.dir.deleteFile(self.io, token_hex) catch {}; 2719 } 2720 2721 // leave `token_hex`'s session for visitors arriving without one. only the 2722 // `try` fixture writes one. the name can't collide with a session token. 2723 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2724 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2725 defer file.close(self.io); 2726 try file.writeStreamingAll(self.io, token_hex); 2727 } 2728 2729 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2730 out.* = self.auto_login orelse return false; 2731 return true; 2732 } 2733 2734 const auto_login_name = "auto-login"; 2735 2736 // a token is exactly token_hex_len hex chars. validating before using the 2737 // value as a path keeps attacker-supplied cookies from escaping the 2738 // sessions dir (e.g. via "/" or ".." bytes). 2739 fn isToken(token_hex: []const u8) bool { 2740 if (token_hex.len != token_hex_len) return false; 2741 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2742 return true; 2743 } 2744 }; 2745