╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭56782401..╮ 56782401.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (657) 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 │ ╰─────────────────────────────────╯
2117 fn findEmbed(request_path: []const u8) ?Embed { 2118 // embeds are matched before pages, so a dot keeps them from claiming a username or tab 2119 comptime for (embeds) |embed| { 2120 if (std.mem.indexOfScalar(u8, embed.path, '.') == null) @compileError("embed path needs a '.' so it can't shadow a page: " ++ embed.path); 2121 }; 2122 if (request_path.len < 2 or request_path[0] != '/') return null; 2123 const path = request_path[1..]; 2124 2125 for (embeds) |embed| { 2126 if (std.mem.eql(u8, path, embed.path)) return embed; 2127 } 2128 return null; 2129 } 2130 2131 // emits the TUI grid cells as static HTML. each web-native Scroll becomes its 2132 // own absolutely-positioned, natively-scrollable <div> holding its full content, 2133 // rendered recursively so nested scrolls work. 2134 pub fn generateHtml(allocator: std.mem.Allocator, root: *ui.Widget, session: *ui.Session) ![]const u8 { 2135 const grid = root.getGrid() orelse return error.MissingGrid; 2136 const root_focus = root.getFocus(); 2137 2138 var out: std.ArrayList(u8) = .empty; 2139 errdefer out.deinit(allocator); 2140 2141 switch (root.*) { 2142 .background => |*background| { 2143 if (background.art.getGrid()) |art| { 2144 try out.print(allocator, "<div class=\"ansi-art\" aria-hidden=\"true\" style=\"left:{d}ch;opacity:{d}%\">", .{ grid.size.width -| art.size.width, ui.widget.AnsiBackground.art_opacity }); 2145 try renderPanel(allocator, &out, background.art.getFocus(), art, session, root_focus); 2146 try out.appendSlice(allocator, "</div>"); 2147 } 2148 }, 2149 else => {}, 2150 } 2151 try out.appendSlice(allocator, "<div class=\"grid-content\" data-key=\"panel:root\">"); 2152 try renderPanel(allocator, &out, root_focus, grid, session, root_focus); 2153 try out.appendSlice(allocator, "</div>"); 2154 try renderForms(allocator, &out, root_focus); 2155 return try out.toOwnedSlice(allocator); 2156 } 2157 2158 // render one panel — a focus subtree and its content grid — as HTML, recursing 2159 // once per web-native Scroll inside it. the root panel is the whole page; each 2160 // Scroll becomes a nested, natively-scrollable div holding its full content. 2161 // emits the panel's grid cells as text, leaving holes where child scrolls sit, 2162 // then the child scroll divs over those holes. 2163 fn renderPanel(allocator: std.mem.Allocator, output: *std.ArrayList(u8), focus: *Focus, grid: Grid, session: *ui.Session, root_focus: *Focus) !void { 2164 // `direct` is this panel's scroll children, each drawn as an overlaid div. 2165 // `excluded` is every focus id that belongs to a scroll (the scroll nodes 2166 // plus their descendants, which the focus tree flattens into this panel's 2167 // children): the cell hit-test below skips them so this panel doesn't claim 2168 // cells that are really rendered inside a child scroll's own panel. 2169 // (scrolls aren't nested in practice, so every scroll child is direct here.) 2170 var direct: std.ArrayList(usize) = .empty; 2171 defer direct.deinit(allocator); 2172 var excluded: std.AutoHashMapUnmanaged(usize, void) = .empty; 2173 defer excluded.deinit(allocator); 2174 { 2175 var it = focus.children.iterator(); 2176 while (it.next()) |e| { 2177 if (e.value_ptr.focus.scroll == null) continue; 2178 try direct.append(allocator, e.key_ptr.*); 2179 try excluded.put(allocator, e.key_ptr.*, {}); 2180 var mit = e.value_ptr.focus.children.iterator(); 2181 while (mit.next()) |m| try excluded.put(allocator, m.key_ptr.*, {}); 2182 } 2183 } 2184 2185 // the HTML element a run of cells is wrapped in, chosen from the cell's 2186 // focusable kind 2187 const CellTag = union(enum) { 2188 span, // clickable focusable cell 2189 a: []const u8, // clickable focusable link 2190 plain, // non-focusable, colored 2191 2192 const a_prefix = "a:"; 2193 // an "in-page" anchor: rendered as a real <a href> so it works with js 2194 // disabled, but wasm handles it without navigating. 2195 fn init(str: []const u8) @This() { 2196 if (std.mem.startsWith(u8, str, ui.raw_link_prefix)) { 2197 return .{ .a = str[ui.raw_link_prefix.len..] }; 2198 } 2199 if (std.mem.startsWith(u8, str, ui.in_page_link_prefix)) { 2200 return .{ .a = str[ui.in_page_link_prefix.len..] }; 2201 } 2202 if (std.mem.startsWith(u8, str, a_prefix)) { 2203 return .{ .a = str[a_prefix.len..] }; 2204 } 2205 return .span; 2206 } 2207 2208 fn writeOpenTag(self: @This(), alloc: std.mem.Allocator, out: *std.ArrayList(u8), id: usize, style_attr: []const u8) !void { 2209 var id_buf: [32]u8 = undefined; 2210 switch (self) { 2211 .span => { 2212 try out.appendSlice(alloc, "<span class=\"clickable\" data-focus-id=\""); 2213 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2214 try out.appendSlice(alloc, "\""); 2215 try out.appendSlice(alloc, style_attr); 2216 try out.appendSlice(alloc, ">"); 2217 }, 2218 .a => |href| { 2219 // tabindex=-1 keeps these out of the browser's tab order 2220 try out.appendSlice(alloc, "<a class=\"clickable\" tabindex=\"-1\" data-focus-id=\""); 2221 try out.appendSlice(alloc, try std.fmt.bufPrint(&id_buf, "{d}", .{id})); 2222 try out.appendSlice(alloc, "\" href=\""); 2223 try appendEscapedHtml(alloc, out, href); 2224 try out.appendSlice(alloc, "\""); 2225 try out.appendSlice(alloc, style_attr); 2226 try out.appendSlice(alloc, ">"); 2227 }, 2228 .plain => { 2229 try out.appendSlice(alloc, "<span"); 2230 try out.appendSlice(alloc, style_attr); 2231 try out.appendSlice(alloc, ">"); 2232 }, 2233 } 2234 } 2235 2236 fn closeTag(self: @This()) []const u8 { 2237 return switch (self) { 2238 .span, .plain => "</span>", 2239 .a => "</a>", 2240 }; 2241 } 2242 }; 2243 2244 // the focusable owning each cell, among this panel's own (skipping any 2245 // that belong to a child scroll, whose cells are drawn in their own panel). 2246 // claimed in focus order, so the first focusable over a cell keeps it. 2247 // looking every focusable up for every cell is quadratic in a long list. 2248 const owners = try allocator.alloc(?usize, grid.size.width * grid.size.height); 2249 defer allocator.free(owners); 2250 @memset(owners, null); 2251 { 2252 var it = focus.children.iterator(); 2253 while (it.next()) |entry| { 2254 const child = entry.value_ptr.*; 2255 if (child.focus.mode != .all) continue; 2256 if (excluded.contains(entry.key_ptr.*)) continue; 2257 const r = child.rect; 2258 for (@min(r.y, grid.size.height)..@min(r.y + r.size.height, grid.size.height)) |y| { 2259 for (@min(r.x, grid.size.width)..@min(r.x + r.size.width, grid.size.width)) |x| { 2260 const owner = &owners[y * grid.size.width + x]; 2261 if (owner.* == null) owner.* = entry.key_ptr.*; 2262 } 2263 } 2264 } 2265 } 2266 2267 // the cells are the volatile part of a panel. js replaces this one subtree 2268 // wholesale while retaining the panel's native controls and scroll shells. 2269 try output.appendSlice(allocator, "<div class=\"grid-cells\">"); 2270 2271 // emit this panel's grid as rows of text, coalescing adjacent cells that 2272 // share a focus id and style into one tag (a clickable span, a link, or a 2273 // plain styled span). cells under a child scroll keep only their background. 2274 // a cell's own link is an anchor nested in that tag. 2275 for (0..grid.size.height) |y| { 2276 var cur_id: ?usize = null; 2277 var cur_style: Grid.Style = .{}; 2278 var open_tag: ?CellTag = null; 2279 var open_link: ?[]const u8 = null; 2280 var first = true; 2281 for (0..grid.size.width) |x| { 2282 const cell = (try grid.cell(x, y)).*; 2283 // a cell covered by a child scroll's viewport is drawn by that scroll's 2284 // own div, so blank its glyph and make it non-clickable here — but keep 2285 // its background, so the backdrop still shows through the scroll's 2286 // transparent div instead of a bare hole. 2287 const covered_by_scroll = blk: { 2288 for (direct.items) |id| { 2289 const r = (focus.children.get(id) orelse continue).rect; 2290 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; 2291 } 2292 break :blk false; 2293 }; 2294 // the focusable owning the cell at (x, y); none for a covered cell. 2295 const cell_id = if (covered_by_scroll) null else owners[y * grid.size.width + x]; 2296 const style: Grid.Style = if (covered_by_scroll) .{ .bg = cell.style.bg } else cell.style; 2297 2298 if (first or cell_id != cur_id or !style.eql(cur_style)) { 2299 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2300 open_link = null; 2301 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2302 2303 var new_tag: ?CellTag = null; 2304 if (cell_id) |id| { 2305 if (focus.children.get(id)) |child| { 2306 new_tag = switch (child.focus.kind) { 2307 .custom => |custom| CellTag.init(custom), 2308 else => .span, 2309 }; 2310 } 2311 } 2312 if (new_tag == null and !style.eql(.{})) new_tag = .plain; 2313 2314 if (new_tag) |t| { 2315 var style_buf: [192]u8 = undefined; 2316 try t.writeOpenTag(allocator, output, cell_id orelse 0, styleAttr(&style_buf, style)); 2317 } 2318 2319 open_tag = new_tag; 2320 cur_id = cell_id; 2321 cur_style = style; 2322 first = false; 2323 } 2324 2325 // an anchor can't nest in another, so a link tag's cells skip theirs 2326 const in_anchor = if (open_tag) |t| t == .a else false; 2327 const link = if (covered_by_scroll or in_anchor) null else webLink(cell.link); 2328 if (!sameLink(link, open_link)) { 2329 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2330 if (link) |url| { 2331 // a page path opens in this tab, any other url in a new one 2332 try output.appendSlice(allocator, if (url[0] == '/') 2333 "<a class=\"cell-link\" tabindex=\"-1\" href=\"" 2334 else 2335 "<a class=\"cell-link\" tabindex=\"-1\" target=\"_blank\" rel=\"noopener noreferrer\" href=\""); 2336 try appendEscapedHtml(allocator, output, url); 2337 try output.appendSlice(allocator, "\">"); 2338 } 2339 open_link = link; 2340 } 2341 2342 if (covered_by_scroll) { 2343 try appendEscapedHtml(allocator, output, " "); 2344 } else if (cell.continuation) { 2345 // the wide rune to the left was emitted 2ch wide, covering this column 2346 } else if (cell.rune) |rune| { 2347 var encoded: [4]u8 = undefined; 2348 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2349 const rune_text = encoded[0..encoded_len]; 2350 // a double-width rune is pinned inside a 2ch span so the 2351 // fallback glyph's advance width can't shift the rest of the row 2352 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2353 if (wide) { 2354 try output.appendSlice(allocator, "<span class=\"w2\">"); 2355 try appendEscapedHtml(allocator, output, rune_text); 2356 try output.appendSlice(allocator, "</span>"); 2357 } else { 2358 try appendEscapedHtml(allocator, output, rune_text); 2359 } 2360 } else { 2361 try appendEscapedHtml(allocator, output, " "); 2362 } 2363 } 2364 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2365 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2366 try output.append(allocator, '\n'); 2367 } 2368 try output.appendSlice(allocator, "</div>"); 2369 2370 // native controls live in their panel, beside the replaceable cells. their 2371 // stable keys let JS update layout without recreating their DOM nodes, and 2372 // being actual descendants of a scroll gives them native movement/clipping. 2373 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2374 2375 // each child scroll becomes a natively-scrollable div positioned over its 2376 // viewport, holding its full content rendered recursively. 2377 for (direct.items) |id| { 2378 const child = focus.children.get(id) orelse continue; 2379 const info = child.focus.scroll orelse continue; 2380 const r = child.rect; 2381 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2382 // when that axis actually overflows. the other axis is clipped (hidden), 2383 // matching how the terminal Scroll handles its non-scrolling axis. 2384 const overflow = switch (info.direction) { 2385 .vert => "overflow-x:hidden;overflow-y:auto", 2386 .horiz => "overflow-x:auto;overflow-y:hidden", 2387 .both => "overflow:auto", 2388 }; 2389 // the id carries a content version so JS preserves the native scroll 2390 // position across re-renders of the same content but resets it when the 2391 // content is replaced — e.g. selecting a different commit. the widget's 2392 // scroll offset (in cells) rides along so JS can apply it when it has no 2393 // preserved position, letting a wasm-side scrollToRect (the files list 2394 // scrolling to its selected row on page load) reach the browser. 2395 var buf: [256]u8 = undefined; 2396 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 })); 2397 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2398 try output.appendSlice(allocator, "</div>"); 2399 } 2400 } 2401 2402 const form_prefix = "form:"; 2403 const form_id_prefix = "haxy-form-"; 2404 2405 fn formAction(focus: *const Focus) ?[]const u8 { 2406 return switch (focus.kind) { 2407 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2408 else => null, 2409 }; 2410 } 2411 2412 // find the form ancestor of a flattened focus-tree child. html's `form` 2413 // attribute then associates the control with that form without requiring the 2414 // form and control to share a DOM parent. 2415 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2416 var id = focus_id; 2417 while (root_focus.children.get(id)) |child| { 2418 const parent_id = child.parent_id; 2419 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2420 const parent = root_focus.children.get(parent_id) orelse return null; 2421 if (formAction(parent.focus) != null) return parent_id; 2422 id = parent_id; 2423 } 2424 return null; 2425 } 2426 2427 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2428 const form_id = formOwner(root_focus, focus_id) orelse return; 2429 var buf: [64]u8 = undefined; 2430 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2431 } 2432 2433 fn renderPanelControls( 2434 allocator: std.mem.Allocator, 2435 output: *std.ArrayList(u8), 2436 focus: *Focus, 2437 session: *ui.Session, 2438 root_focus: *Focus, 2439 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2440 ) !void { 2441 var iter = focus.children.iterator(); 2442 while (iter.next()) |entry| { 2443 const id = entry.key_ptr.*; 2444 if (excluded.contains(id)) continue; 2445 const child = entry.value_ptr.*; 2446 const r = child.rect; 2447 2448 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2449 2450 switch (child.focus.kind) { 2451 .text_input, .text_input_password, .text_area => { 2452 const ti = session.text_inputs.get(id) orelse continue; 2453 2454 const inner_left = r.x + 1; 2455 const inner_top = r.y + 1; 2456 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2457 const preserve = !ti.options.read_only; 2458 2459 if (child.focus.kind == .text_area) { 2460 const value = try ti.text(allocator); 2461 defer allocator.free(value); 2462 var id_buf: [128]u8 = undefined; 2463 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2464 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2465 try appendFormAttribute(allocator, output, root_focus, id); 2466 if (ti.options.name.len > 0) { 2467 try output.appendSlice(allocator, " name=\""); 2468 try appendEscapedHtml(allocator, output, ti.options.name); 2469 try output.append(allocator, '"'); 2470 } 2471 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2472 var pos_buf: [128]u8 = undefined; 2473 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 })); 2474 try appendEscapedHtml(allocator, output, value); 2475 try output.appendSlice(allocator, "</textarea>"); 2476 continue; 2477 } 2478 2479 var id_buf: [160]u8 = undefined; 2480 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 })); 2481 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2482 try appendFormAttribute(allocator, output, root_focus, id); 2483 if (ti.options.name.len > 0) { 2484 try output.appendSlice(allocator, " name=\""); 2485 try appendEscapedHtml(allocator, output, ti.options.name); 2486 try output.append(allocator, '"'); 2487 } 2488 if (child.focus.kind != .text_input_password) { 2489 const value = try ti.text(allocator); 2490 defer allocator.free(value); 2491 try output.appendSlice(allocator, " value=\""); 2492 try appendEscapedHtml(allocator, output, value); 2493 try output.append(allocator, '"'); 2494 } 2495 var pos_buf: [96]u8 = undefined; 2496 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 })); 2497 }, 2498 .custom => |custom| { 2499 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2500 if (formOwner(root_focus, id) == null) continue; 2501 var id_buf: [128]u8 = undefined; 2502 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2503 try appendFormAttribute(allocator, output, root_focus, id); 2504 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2505 try output.appendSlice(allocator, " formaction=\""); 2506 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2507 try output.append(allocator, '"'); 2508 } 2509 var pos_buf: [128]u8 = undefined; 2510 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 })); 2511 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2512 // an invisible native radio over the option, checked when the option is its row's selection 2513 const field = custom[ui.radio_prefix.len..]; 2514 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2515 const row = root_focus.children.get(child.parent_id) orelse continue; 2516 var id_buf: [128]u8 = undefined; 2517 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2518 try appendFormAttribute(allocator, output, root_focus, id); 2519 try output.appendSlice(allocator, " name=\""); 2520 try appendEscapedHtml(allocator, output, field[0..separator]); 2521 try output.appendSlice(allocator, "\" value=\""); 2522 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2523 try output.append(allocator, '"'); 2524 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2525 var pos_buf: [128]u8 = undefined; 2526 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 })); 2527 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2528 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2529 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2530 var id_buf: [128]u8 = undefined; 2531 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 })); 2532 } 2533 }, 2534 else => {}, 2535 } 2536 } 2537 } 2538 2539 // emit hidden form owners beside the rendered panels. their controls point 2540 // back here with the standard HTML `form` attribute. 2541 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2542 // the focus child map preserves insertion order, which matches the order 2543 // widgets were added in code 2544 var iter = root_focus.children.iterator(); 2545 while (iter.next()) |entry| { 2546 const child = entry.value_ptr.*; 2547 const action_url = formAction(child.focus) orelse continue; 2548 2549 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2550 var id_buf: [96]u8 = undefined; 2551 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2552 try appendEscapedHtml(allocator, output, action_url); 2553 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2554 } 2555 } 2556 2557 // the 16 ansi colors as the browser shows them (xterm's defaults) 2558 const ansi_palette = [16]Grid.Color.Rgb{ 2559 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2560 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2561 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2562 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2563 }; 2564 2565 // resolve any color to rgb: palette colors through the ansi table and the 2566 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2567 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2568 return switch (color) { 2569 .rgb => |c| c, 2570 .ansi => |a| ansi_palette[@backingInt(a)], 2571 .indexed => |n| if (n < 16) 2572 ansi_palette[n] 2573 else if (n < 232) blk: { 2574 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2575 const i = n - 16; 2576 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2577 } else blk: { 2578 const v: u8 = 8 + (n - 232) * 10; 2579 break :blk .{ .r = v, .g = v, .b = v }; 2580 }, 2581 }; 2582 } 2583 2584 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2585 // cell's style into `buf`, omitting whichever color is unset. an inverted 2586 // cell swaps the two, falling back to the page's --fg/--bg variables for 2587 // whichever side is unset. text attributes follow the colors. returns an 2588 // empty slice when nothing is set. 2589 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2590 if (style.eql(.{})) return buf[0..0]; 2591 const prefix = " style=\""; 2592 @memcpy(buf[0..prefix.len], prefix); 2593 var i: usize = prefix.len; 2594 const inverted = style.inverted; 2595 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2596 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2597 const decoration: []const u8 = if (style.underline and style.strikethrough) 2598 "text-decoration:underline line-through;" 2599 else if (style.underline) 2600 "text-decoration:underline;" 2601 else if (style.strikethrough) 2602 "text-decoration:line-through;" 2603 else 2604 ""; 2605 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2606 if (style.bold) "font-weight:bold;" else "", 2607 if (style.italic) "font-style:italic;" else "", 2608 decoration, 2609 if (style.dim) "opacity:.6;" else "", 2610 }) catch return buf[0..0]; 2611 i += attributes.len; 2612 if (i >= buf.len) return buf[0..0]; 2613 buf[i] = '"'; 2614 return buf[0 .. i + 1]; 2615 } 2616 2617 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2618 // the color is unset (nothing when both are). returns the new end, or null 2619 // when it doesn't fit. 2620 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2621 const s = if (color) |c| blk: { 2622 const v = colorRgb(c); 2623 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; 2624 } else if (fallback) |f| 2625 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2626 else 2627 return i; 2628 return i + s.len; 2629 } 2630 2631 // a cell's link as an href, when it's a page path or a web or mail url 2632 fn webLink(link: ?[]const u8) ?[]const u8 { 2633 const url = link orelse return null; 2634 // a page path, not a protocol-relative url 2635 if (url.len > 1 and url[0] == '/' and url[1] != '/') return url; 2636 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2637 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2638 } 2639 return null; 2640 } 2641 2642 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2643 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2644 return b == null; 2645 } 2646 2647 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2648 for (input) |ch| { 2649 switch (ch) { 2650 '&' => try out.appendSlice(allocator, "&amp;"), 2651 '<' => try out.appendSlice(allocator, "&lt;"), 2652 '>' => try out.appendSlice(allocator, "&gt;"), 2653 '"' => try out.appendSlice(allocator, "&quot;"), 2654 '\'' => try out.appendSlice(allocator, "&#39;"), 2655 else => try out.append(allocator, ch), 2656 } 2657 } 2658 } 2659 2660 // --- helpers -------------------------------------------------------------- 2661 2662 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2663 var iter = request.iterateHeaders(); 2664 while (iter.next()) |header| { 2665 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2666 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2667 while (pairs.next()) |pair| { 2668 const trimmed = std.mem.trim(u8, pair, " \t"); 2669 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2670 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2671 return trimmed[eq + 1 ..]; 2672 } 2673 } 2674 } 2675 return null; 2676 } 2677 2678 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2679 var iter = std.mem.splitScalar(u8, body, '&'); 2680 while (iter.next()) |pair| { 2681 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2682 if (std.mem.eql(u8, pair[0..eq], key)) { 2683 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2684 } 2685 } 2686 return null; 2687 } 2688 2689 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2690 var buffer: [256]u8 = undefined; 2691 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2692 } 2693 2694 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2695 var out: std.ArrayList(u8) = .empty; 2696 errdefer out.deinit(allocator); 2697 var i: usize = 0; 2698 while (i < encoded.len) : (i += 1) { 2699 switch (encoded[i]) { 2700 '+' => try out.append(allocator, ' '), 2701 '%' => { 2702 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2703 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2704 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2705 try out.append(allocator, hi * 16 + lo); 2706 i += 2; 2707 }, 2708 else => try out.append(allocator, encoded[i]), 2709 } 2710 } 2711 return try out.toOwnedSlice(allocator); 2712 } 2713 2714 // disk-backed web session store. each login mints a random, opaque token 2715 // (not the user's id) that is stored as a file named by the token hex, whose 2716 // contents are the raw user_id bytes. authenticating a request is a lookup of 2717 // the cookie's token; logout deletes the file, revoking the session. there is 2718 // deliberately no expiry — a session lives until logout. form failures use 2719 // files in the flash subdirectory that the redirected GET consumes. the 2720 // directory is cleared whenever the server starts. 2721 pub const SessionStore = struct { 2722 io: std.Io, 2723 dir: std.Io.Dir, 2724 flash_dir: std.Io.Dir, 2725 auto_login: ?[token_hex_len]u8, 2726 2727 pub const token_hex_len = evt.event_id_size * 2; 2728 2729 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2730 try data_dir.createDirPath(io, "sessions"); 2731 const dir = try data_dir.openDir(io, "sessions", .{}); 2732 errdefer dir.close(io); 2733 try dir.deleteTree(io, "flash"); 2734 try dir.createDirPath(io, "flash"); 2735 const flash_dir = try dir.openDir(io, "flash", .{}); 2736 errdefer flash_dir.close(io); 2737 const auto_login = blk: { 2738 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2739 defer file.close(io); 2740 var token: [token_hex_len]u8 = undefined; 2741 var storage: [token_hex_len]u8 = undefined; 2742 var reader = file.reader(io, &storage); 2743 reader.interface.readSliceAll(&token) catch break :blk null; 2744 break :blk token; 2745 }; 2746 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2747 } 2748 2749 pub fn deinit(self: SessionStore) void { 2750 self.flash_dir.close(self.io); 2751 self.dir.close(self.io); 2752 } 2753 2754 // mint a new session for user_id, returning the token hex to set as the 2755 // cookie value. 2756 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2757 var token: [evt.event_id_size]u8 = undefined; 2758 self.io.random(&token); 2759 const token_hex = std.fmt.bytesToHex(token, .lower); 2760 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2761 defer file.close(self.io); 2762 try file.writeStreamingAll(self.io, user_id); 2763 return token_hex; 2764 } 2765 2766 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2767 var token: [evt.event_id_size]u8 = undefined; 2768 self.io.random(&token); 2769 const token_hex = std.fmt.bytesToHex(token, .lower); 2770 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2771 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2772 defer file.close(self.io); 2773 2774 var json: std.Io.Writer.Allocating = .init(allocator); 2775 defer json.deinit(); 2776 try std.json.Stringify.value(value, .{}, &json.writer); 2777 try file.writeStreamingAll(self.io, json.written()); 2778 return token_hex; 2779 } 2780 2781 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2782 if (!isToken(token_hex)) return null; 2783 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2784 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2785 defer file.close(self.io); 2786 2787 var storage: [4096]u8 = undefined; 2788 var reader = file.reader(self.io, &storage); 2789 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2790 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2791 } 2792 2793 // resolve a cookie's token to its user_id. returns false (logged out) for a 2794 // missing, malformed, or unknown token. 2795 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2796 if (!isToken(token_hex)) return false; 2797 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2798 defer file.close(self.io); 2799 var storage: [evt.event_id_size]u8 = undefined; 2800 var file_reader = file.reader(self.io, &storage); 2801 file_reader.interface.readSliceAll(out) catch return false; 2802 return true; 2803 } 2804 2805 // revoke a session. a no-op for a missing or malformed token. 2806 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2807 if (!isToken(token_hex)) return; 2808 self.dir.deleteFile(self.io, token_hex) catch {}; 2809 } 2810 2811 // leave `token_hex`'s session for visitors arriving without one. only the 2812 // `try` fixture writes one. the name can't collide with a session token. 2813 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2814 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2815 defer file.close(self.io); 2816 try file.writeStreamingAll(self.io, token_hex); 2817 } 2818 2819 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2820 out.* = self.auto_login orelse return false; 2821 return true; 2822 } 2823 2824 const auto_login_name = "auto-login"; 2825 2826 // a token is exactly token_hex_len hex chars. validating before using the 2827 // value as a path keeps attacker-supplied cookies from escaping the 2828 // sessions dir (e.g. via "/" or ".." bytes). 2829 fn isToken(token_hex: []const u8) bool { 2830 if (token_hex.len != token_hex_len) return false; 2831 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2832 return true; 2833 } 2834 }; 2835