╭─────────────╮ │scroll to top│ ╰─────────────╯ ╭ web.zig ──────────────────────────────────────────────────────╮ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ ╰───────────────────────────────────────────────────────────────╯
🬐 🬠 🬞🬂🬏 🬟 🬑 🬟 🬑 ╭e773cb53..╮ e773cb53.. see-em: 🬋🬋🬋 🬋🬋🬋 🬋 🬋 │files │ commits refs discuss issues new login 🬐 🬠 🬐 🬠 🬑 🬟 🬰 ╰──────────╯ (613) 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 │ ╰─────────────────────────────────╯
2152 try appendEscapedHtml(allocator, output, " "); 2153 } else if (cell.continuation) { 2154 // the wide rune to the left was emitted 2ch wide, covering this column 2155 } else if (cell.rune) |rune| { 2156 var encoded: [4]u8 = undefined; 2157 const encoded_len = try std.unicode.utf8Encode(rune, &encoded); 2158 const rune_text = encoded[0..encoded_len]; 2159 // a double-width rune is pinned inside a 2ch span so the 2160 // fallback glyph's advance width can't shift the rest of the row 2161 const wide = x + 1 < grid.size.width and (try grid.cell(x + 1, y)).continuation; 2162 if (wide) { 2163 try output.appendSlice(allocator, "<span class=\"w2\">"); 2164 try appendEscapedHtml(allocator, output, rune_text); 2165 try output.appendSlice(allocator, "</span>"); 2166 } else { 2167 try appendEscapedHtml(allocator, output, rune_text); 2168 } 2169 } else { 2170 try appendEscapedHtml(allocator, output, " "); 2171 } 2172 } 2173 if (open_link != null) try output.appendSlice(allocator, "</a>"); 2174 if (open_tag) |t| try output.appendSlice(allocator, t.closeTag()); 2175 try output.append(allocator, '\n'); 2176 } 2177 try output.appendSlice(allocator, "</div>"); 2178 2179 // native controls live in their panel, beside the replaceable cells. their 2180 // stable keys let JS update layout without recreating their DOM nodes, and 2181 // being actual descendants of a scroll gives them native movement/clipping. 2182 try renderPanelControls(allocator, output, focus, session, root_focus, &excluded); 2183 2184 // each child scroll becomes a natively-scrollable div positioned over its 2185 // viewport, holding its full content rendered recursively. 2186 for (direct.items) |id| { 2187 const child = focus.children.get(id) orelse continue; 2188 const info = child.focus.scroll orelse continue; 2189 const r = child.rect; 2190 // overflow only on the axes the widget scrolls; `auto` shows a bar only 2191 // when that axis actually overflows. the other axis is clipped (hidden), 2192 // matching how the terminal Scroll handles its non-scrolling axis. 2193 const overflow = switch (info.direction) { 2194 .vert => "overflow-x:hidden;overflow-y:auto", 2195 .horiz => "overflow-x:auto;overflow-y:hidden", 2196 .both => "overflow:auto", 2197 }; 2198 // the id carries a content version so JS preserves the native scroll 2199 // position across re-renders of the same content but resets it when the 2200 // content is replaced — e.g. selecting a different commit. the widget's 2201 // scroll offset (in cells) rides along so JS can apply it when it has no 2202 // preserved position, letting a wasm-side scrollToRect (the files list 2203 // scrolling to its selected row on page load) reach the browser. 2204 var buf: [256]u8 = undefined; 2205 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 })); 2206 try renderPanel(allocator, output, child.focus, info.content, session, root_focus); 2207 try output.appendSlice(allocator, "</div>"); 2208 } 2209 } 2210 2211 const form_prefix = "form:"; 2212 const form_id_prefix = "haxy-form-"; 2213 2214 fn formAction(focus: *const Focus) ?[]const u8 { 2215 return switch (focus.kind) { 2216 .custom => |custom| if (std.mem.startsWith(u8, custom, form_prefix)) custom[form_prefix.len..] else null, 2217 else => null, 2218 }; 2219 } 2220 2221 // find the form ancestor of a flattened focus-tree child. html's `form` 2222 // attribute then associates the control with that form without requiring the 2223 // form and control to share a DOM parent. 2224 fn formOwner(root_focus: *Focus, focus_id: usize) ?usize { 2225 var id = focus_id; 2226 while (root_focus.children.get(id)) |child| { 2227 const parent_id = child.parent_id; 2228 if (parent_id == root_focus.id) return if (formAction(root_focus) != null) root_focus.id else null; 2229 const parent = root_focus.children.get(parent_id) orelse return null; 2230 if (formAction(parent.focus) != null) return parent_id; 2231 id = parent_id; 2232 } 2233 return null; 2234 } 2235 2236 fn appendFormAttribute(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus, focus_id: usize) !void { 2237 const form_id = formOwner(root_focus, focus_id) orelse return; 2238 var buf: [64]u8 = undefined; 2239 try output.appendSlice(allocator, try std.fmt.bufPrint(&buf, " form=\"" ++ form_id_prefix ++ "{d}\"", .{form_id})); 2240 } 2241 2242 fn renderPanelControls( 2243 allocator: std.mem.Allocator, 2244 output: *std.ArrayList(u8), 2245 focus: *Focus, 2246 session: *ui.Session, 2247 root_focus: *Focus, 2248 excluded: *const std.AutoHashMapUnmanaged(usize, void), 2249 ) !void { 2250 var iter = focus.children.iterator(); 2251 while (iter.next()) |entry| { 2252 const id = entry.key_ptr.*; 2253 if (excluded.contains(id)) continue; 2254 const child = entry.value_ptr.*; 2255 const r = child.rect; 2256 2257 if (r.size.width == 0 or r.size.height == 0) continue; // not laid out, rather than merely off-screen 2258 2259 switch (child.focus.kind) { 2260 .text_input, .text_input_password, .text_area => { 2261 const ti = session.text_inputs.get(id) orelse continue; 2262 2263 const inner_left = r.x + 1; 2264 const inner_top = r.y + 1; 2265 const inner_width = if (r.size.width > 2) r.size.width - 2 else 0; 2266 const preserve = !ti.options.read_only; 2267 2268 if (child.focus.kind == .text_area) { 2269 const value = try ti.text(allocator); 2270 defer allocator.free(value); 2271 var id_buf: [128]u8 = undefined; 2272 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<textarea data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2273 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2274 try appendFormAttribute(allocator, output, root_focus, id); 2275 if (ti.options.name.len > 0) { 2276 try output.appendSlice(allocator, " name=\""); 2277 try appendEscapedHtml(allocator, output, ti.options.name); 2278 try output.append(allocator, '"'); 2279 } 2280 const inner_height = if (r.size.height > 2) r.size.height - 2 else 0; 2281 var pos_buf: [128]u8 = undefined; 2282 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 })); 2283 try appendEscapedHtml(allocator, output, value); 2284 try output.appendSlice(allocator, "</textarea>"); 2285 continue; 2286 } 2287 2288 var id_buf: [160]u8 = undefined; 2289 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 })); 2290 if (preserve) try output.appendSlice(allocator, " data-preserve-value") else try output.appendSlice(allocator, " readonly"); 2291 try appendFormAttribute(allocator, output, root_focus, id); 2292 if (ti.options.name.len > 0) { 2293 try output.appendSlice(allocator, " name=\""); 2294 try appendEscapedHtml(allocator, output, ti.options.name); 2295 try output.append(allocator, '"'); 2296 } 2297 if (child.focus.kind != .text_input_password) { 2298 const value = try ti.text(allocator); 2299 defer allocator.free(value); 2300 try output.appendSlice(allocator, " value=\""); 2301 try appendEscapedHtml(allocator, output, value); 2302 try output.append(allocator, '"'); 2303 } 2304 var pos_buf: [96]u8 = undefined; 2305 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 })); 2306 }, 2307 .custom => |custom| { 2308 if (std.mem.eql(u8, custom, "submit") or std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2309 if (formOwner(root_focus, id) == null) continue; 2310 var id_buf: [128]u8 = undefined; 2311 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<button type=\"submit\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2312 try appendFormAttribute(allocator, output, root_focus, id); 2313 if (std.mem.startsWith(u8, custom, ui.submit_action_prefix)) { 2314 try output.appendSlice(allocator, " formaction=\""); 2315 try appendEscapedHtml(allocator, output, custom[ui.submit_action_prefix.len..]); 2316 try output.append(allocator, '"'); 2317 } 2318 var pos_buf: [128]u8 = undefined; 2319 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 })); 2320 } else if (std.mem.startsWith(u8, custom, ui.radio_prefix)) { 2321 // an invisible native radio over the option, checked when the option is its row's selection 2322 const field = custom[ui.radio_prefix.len..]; 2323 const separator = std.mem.indexOfScalar(u8, field, '=') orelse continue; 2324 const row = root_focus.children.get(child.parent_id) orelse continue; 2325 var id_buf: [128]u8 = undefined; 2326 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "<input type=\"radio\" data-key=\"control:{d}\" data-focus-id=\"{d}\"", .{ id, id })); 2327 try appendFormAttribute(allocator, output, root_focus, id); 2328 try output.appendSlice(allocator, " name=\""); 2329 try appendEscapedHtml(allocator, output, field[0..separator]); 2330 try output.appendSlice(allocator, "\" value=\""); 2331 try appendEscapedHtml(allocator, output, field[separator + 1 ..]); 2332 try output.append(allocator, '"'); 2333 if (row.focus.child_id == id) try output.appendSlice(allocator, " checked"); 2334 var pos_buf: [128]u8 = undefined; 2335 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 })); 2336 } else if (std.mem.startsWith(u8, custom, ui.file_input_prefix)) { 2337 try output.appendSlice(allocator, "<input type=\"file\" data-preserve-value data-action=\""); 2338 try appendEscapedHtml(allocator, output, custom[ui.file_input_prefix.len..]); 2339 var id_buf: [128]u8 = undefined; 2340 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 })); 2341 } 2342 }, 2343 else => {}, 2344 } 2345 } 2346 } 2347 2348 // emit hidden form owners beside the rendered panels. their controls point 2349 // back here with the standard HTML `form` attribute. 2350 fn renderForms(allocator: std.mem.Allocator, output: *std.ArrayList(u8), root_focus: *Focus) !void { 2351 // the focus child map preserves insertion order, which matches the order 2352 // widgets were added in code 2353 var iter = root_focus.children.iterator(); 2354 while (iter.next()) |entry| { 2355 const child = entry.value_ptr.*; 2356 const action_url = formAction(child.focus) orelse continue; 2357 2358 try output.appendSlice(allocator, "<form hidden data-key=\"form:"); 2359 var id_buf: [96]u8 = undefined; 2360 try output.appendSlice(allocator, try std.fmt.bufPrint(&id_buf, "{d}\" id=\"" ++ form_id_prefix ++ "{d}\" action=\"", .{ entry.key_ptr.*, entry.key_ptr.* })); 2361 try appendEscapedHtml(allocator, output, action_url); 2362 try output.appendSlice(allocator, "\" method=\"post\"></form>"); 2363 } 2364 } 2365 2366 // the 16 ansi colors as the browser shows them (xterm's defaults) 2367 const ansi_palette = [16]Grid.Color.Rgb{ 2368 .{ .r = 0x00, .g = 0x00, .b = 0x00 }, .{ .r = 0xcd, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xcd, .b = 0x00 }, .{ .r = 0xcd, .g = 0xcd, .b = 0x00 }, 2369 .{ .r = 0x00, .g = 0x00, .b = 0xee }, .{ .r = 0xcd, .g = 0x00, .b = 0xcd }, .{ .r = 0x00, .g = 0xcd, .b = 0xcd }, .{ .r = 0xe5, .g = 0xe5, .b = 0xe5 }, 2370 .{ .r = 0x7f, .g = 0x7f, .b = 0x7f }, .{ .r = 0xff, .g = 0x00, .b = 0x00 }, .{ .r = 0x00, .g = 0xff, .b = 0x00 }, .{ .r = 0xff, .g = 0xff, .b = 0x00 }, 2371 .{ .r = 0x5c, .g = 0x5c, .b = 0xff }, .{ .r = 0xff, .g = 0x00, .b = 0xff }, .{ .r = 0x00, .g = 0xff, .b = 0xff }, .{ .r = 0xff, .g = 0xff, .b = 0xff }, 2372 }; 2373 2374 // resolve any color to rgb: palette colors through the ansi table and the 2375 // xterm 256-color layout (16 ansi, a 6x6x6 cube, then 24 grays) 2376 fn colorRgb(color: Grid.Color) Grid.Color.Rgb { 2377 return switch (color) { 2378 .rgb => |c| c, 2379 .ansi => |a| ansi_palette[@intFromEnum(a)], 2380 .indexed => |n| if (n < 16) 2381 ansi_palette[n] 2382 else if (n < 232) blk: { 2383 const levels = [6]u8{ 0, 0x5f, 0x87, 0xaf, 0xd7, 0xff }; 2384 const i = n - 16; 2385 break :blk .{ .r = levels[i / 36], .g = levels[(i / 6) % 6], .b = levels[i % 6] }; 2386 } else blk: { 2387 const v: u8 = 8 + (n - 232) * 10; 2388 break :blk .{ .r = v, .g = v, .b = v }; 2389 }, 2390 }; 2391 } 2392 2393 // builds an HTML ` style="color:…;background-color:…"` attribute from a 2394 // cell's style into `buf`, omitting whichever color is unset. an inverted 2395 // cell swaps the two, falling back to the page's --fg/--bg variables for 2396 // whichever side is unset. text attributes follow the colors. returns an 2397 // empty slice when nothing is set. 2398 fn styleAttr(buf: []u8, style: Grid.Style) []const u8 { 2399 if (style.eql(.{})) return buf[0..0]; 2400 const prefix = " style=\""; 2401 @memcpy(buf[0..prefix.len], prefix); 2402 var i: usize = prefix.len; 2403 const inverted = style.inverted; 2404 i = cssColor(buf, i, "color", if (inverted) style.bg else style.fg, if (inverted) "var(--bg)" else null) orelse return buf[0..0]; 2405 i = cssColor(buf, i, "background-color", if (inverted) style.fg else style.bg, if (inverted) "var(--fg)" else null) orelse return buf[0..0]; 2406 const decoration: []const u8 = if (style.underline and style.strikethrough) 2407 "text-decoration:underline line-through;" 2408 else if (style.underline) 2409 "text-decoration:underline;" 2410 else if (style.strikethrough) 2411 "text-decoration:line-through;" 2412 else 2413 ""; 2414 const attributes = std.fmt.bufPrint(buf[i..], "{s}{s}{s}{s}", .{ 2415 if (style.bold) "font-weight:bold;" else "", 2416 if (style.italic) "font-style:italic;" else "", 2417 decoration, 2418 if (style.dim) "opacity:.6;" else "", 2419 }) catch return buf[0..0]; 2420 i += attributes.len; 2421 if (i >= buf.len) return buf[0..0]; 2422 buf[i] = '"'; 2423 return buf[0 .. i + 1]; 2424 } 2425 2426 // append `prop:value;` at buf[i..] for the color, or for the fallback when 2427 // the color is unset (nothing when both are). returns the new end, or null 2428 // when it doesn't fit. 2429 fn cssColor(buf: []u8, i: usize, prop: []const u8, color: ?Grid.Color, fallback: ?[]const u8) ?usize { 2430 const s = if (color) |c| blk: { 2431 const v = colorRgb(c); 2432 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; 2433 } else if (fallback) |f| 2434 std.fmt.bufPrint(buf[i..], "{s}:{s};", .{ prop, f }) catch return null 2435 else 2436 return i; 2437 return i + s.len; 2438 } 2439 2440 // a cell's link as an href, when it's a web or mail url 2441 fn webLink(link: ?[]const u8) ?[]const u8 { 2442 const url = link orelse return null; 2443 for ([_][]const u8{ "http://", "https://", "mailto:" }) |scheme| { 2444 if (std.ascii.startsWithIgnoreCase(url, scheme)) return url; 2445 } 2446 return null; 2447 } 2448 2449 fn sameLink(a: ?[]const u8, b: ?[]const u8) bool { 2450 if (a) |x| return if (b) |y| std.mem.eql(u8, x, y) else false; 2451 return b == null; 2452 } 2453 2454 fn appendEscapedHtml(allocator: std.mem.Allocator, out: *std.ArrayList(u8), input: []const u8) !void { 2455 for (input) |ch| { 2456 switch (ch) { 2457 '&' => try out.appendSlice(allocator, "&amp;"), 2458 '<' => try out.appendSlice(allocator, "&lt;"), 2459 '>' => try out.appendSlice(allocator, "&gt;"), 2460 '"' => try out.appendSlice(allocator, "&quot;"), 2461 '\'' => try out.appendSlice(allocator, "&#39;"), 2462 else => try out.append(allocator, ch), 2463 } 2464 } 2465 } 2466 2467 // --- helpers -------------------------------------------------------------- 2468 2469 fn getCookieValue(request: *std.http.Server.Request, name: []const u8) ?[]const u8 { 2470 var iter = request.iterateHeaders(); 2471 while (iter.next()) |header| { 2472 if (!std.ascii.eqlIgnoreCase(header.name, "cookie")) continue; 2473 var pairs = std.mem.splitScalar(u8, header.value, ';'); 2474 while (pairs.next()) |pair| { 2475 const trimmed = std.mem.trim(u8, pair, " \t"); 2476 const eq = std.mem.indexOfScalar(u8, trimmed, '=') orelse continue; 2477 if (std.mem.eql(u8, trimmed[0..eq], name)) { 2478 return trimmed[eq + 1 ..]; 2479 } 2480 } 2481 } 2482 return null; 2483 } 2484 2485 fn parseFormField(allocator: std.mem.Allocator, body: []const u8, key: []const u8) !?[]u8 { 2486 var iter = std.mem.splitScalar(u8, body, '&'); 2487 while (iter.next()) |pair| { 2488 const eq = std.mem.indexOfScalar(u8, pair, '=') orelse continue; 2489 if (std.mem.eql(u8, pair[0..eq], key)) { 2490 return try decodeFormValue(allocator, pair[eq + 1 ..]); 2491 } 2492 } 2493 return null; 2494 } 2495 2496 fn readFormBody(request: *std.http.Server.Request, allocator: std.mem.Allocator) ![]u8 { 2497 var buffer: [256]u8 = undefined; 2498 return request.readerExpectNone(&buffer).allocRemaining(allocator, .limited(65536)); 2499 } 2500 2501 fn decodeFormValue(allocator: std.mem.Allocator, encoded: []const u8) ![]u8 { 2502 var out: std.ArrayList(u8) = .empty; 2503 errdefer out.deinit(allocator); 2504 var i: usize = 0; 2505 while (i < encoded.len) : (i += 1) { 2506 switch (encoded[i]) { 2507 '+' => try out.append(allocator, ' '), 2508 '%' => { 2509 if (i + 2 >= encoded.len) return error.InvalidPercentEncoding; 2510 const hi = std.fmt.charToDigit(encoded[i + 1], 16) catch return error.InvalidPercentEncoding; 2511 const lo = std.fmt.charToDigit(encoded[i + 2], 16) catch return error.InvalidPercentEncoding; 2512 try out.append(allocator, hi * 16 + lo); 2513 i += 2; 2514 }, 2515 else => try out.append(allocator, encoded[i]), 2516 } 2517 } 2518 return try out.toOwnedSlice(allocator); 2519 } 2520 2521 // disk-backed web session store. each login mints a random, opaque token 2522 // (not the user's id) that is stored as a file named by the token hex, whose 2523 // contents are the raw user_id bytes. authenticating a request is a lookup of 2524 // the cookie's token; logout deletes the file, revoking the session. there is 2525 // deliberately no expiry — a session lives until logout. form failures use 2526 // files in the flash subdirectory that the redirected GET consumes. the 2527 // directory is cleared whenever the server starts. 2528 pub const SessionStore = struct { 2529 io: std.Io, 2530 dir: std.Io.Dir, 2531 flash_dir: std.Io.Dir, 2532 auto_login: ?[token_hex_len]u8, 2533 2534 pub const token_hex_len = evt.event_id_size * 2; 2535 2536 pub fn init(io: std.Io, data_dir: std.Io.Dir) !SessionStore { 2537 try data_dir.createDirPath(io, "sessions"); 2538 const dir = try data_dir.openDir(io, "sessions", .{}); 2539 errdefer dir.close(io); 2540 try dir.deleteTree(io, "flash"); 2541 try dir.createDirPath(io, "flash"); 2542 const flash_dir = try dir.openDir(io, "flash", .{}); 2543 errdefer flash_dir.close(io); 2544 const auto_login = blk: { 2545 const file = dir.openFile(io, auto_login_name, .{ .mode = .read_only }) catch break :blk null; 2546 defer file.close(io); 2547 var token: [token_hex_len]u8 = undefined; 2548 var storage: [token_hex_len]u8 = undefined; 2549 var reader = file.reader(io, &storage); 2550 reader.interface.readSliceAll(&token) catch break :blk null; 2551 break :blk token; 2552 }; 2553 return .{ .io = io, .dir = dir, .flash_dir = flash_dir, .auto_login = auto_login }; 2554 } 2555 2556 pub fn deinit(self: SessionStore) void { 2557 self.flash_dir.close(self.io); 2558 self.dir.close(self.io); 2559 } 2560 2561 // mint a new session for user_id, returning the token hex to set as the 2562 // cookie value. 2563 pub fn create(self: SessionStore, user_id: *const [evt.event_id_size]u8) ![token_hex_len]u8 { 2564 var token: [evt.event_id_size]u8 = undefined; 2565 self.io.random(&token); 2566 const token_hex = std.fmt.bytesToHex(token, .lower); 2567 const file = try self.dir.createFile(self.io, &token_hex, .{}); 2568 defer file.close(self.io); 2569 try file.writeStreamingAll(self.io, user_id); 2570 return token_hex; 2571 } 2572 2573 fn createFlash(self: SessionStore, allocator: std.mem.Allocator, value: ui.Session.FormFeedback) ![token_hex_len]u8 { 2574 var token: [evt.event_id_size]u8 = undefined; 2575 self.io.random(&token); 2576 const token_hex = std.fmt.bytesToHex(token, .lower); 2577 const file = try self.flash_dir.createFile(self.io, &token_hex, .{}); 2578 errdefer self.flash_dir.deleteFile(self.io, &token_hex) catch {}; 2579 defer file.close(self.io); 2580 2581 var json: std.Io.Writer.Allocating = .init(allocator); 2582 defer json.deinit(); 2583 try std.json.Stringify.value(value, .{}, &json.writer); 2584 try file.writeStreamingAll(self.io, json.written()); 2585 return token_hex; 2586 } 2587 2588 fn takeFlash(self: SessionStore, allocator: std.mem.Allocator, token_hex: []const u8) ?ui.Session.FormFeedback { 2589 if (!isToken(token_hex)) return null; 2590 const file = self.flash_dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return null; 2591 defer self.flash_dir.deleteFile(self.io, token_hex) catch {}; 2592 defer file.close(self.io); 2593 2594 var storage: [4096]u8 = undefined; 2595 var reader = file.reader(self.io, &storage); 2596 const bytes = reader.interface.allocRemaining(allocator, .limited(512 * 1024)) catch return null; 2597 return std.json.parseFromSliceLeaky(ui.Session.FormFeedback, allocator, bytes, .{}) catch null; 2598 } 2599 2600 // resolve a cookie's token to its user_id. returns false (logged out) for a 2601 // missing, malformed, or unknown token. 2602 pub fn lookup(self: SessionStore, token_hex: []const u8, out: *[evt.event_id_size]u8) bool { 2603 if (!isToken(token_hex)) return false; 2604 const file = self.dir.openFile(self.io, token_hex, .{ .mode = .read_only }) catch return false; 2605 defer file.close(self.io); 2606 var storage: [evt.event_id_size]u8 = undefined; 2607 var file_reader = file.reader(self.io, &storage); 2608 file_reader.interface.readSliceAll(out) catch return false; 2609 return true; 2610 } 2611 2612 // revoke a session. a no-op for a missing or malformed token. 2613 pub fn remove(self: SessionStore, token_hex: []const u8) void { 2614 if (!isToken(token_hex)) return; 2615 self.dir.deleteFile(self.io, token_hex) catch {}; 2616 } 2617 2618 // leave `token_hex`'s session for visitors arriving without one. only the 2619 // `try` fixture writes one. the name can't collide with a session token. 2620 pub fn offerAutoLogin(self: SessionStore, token_hex: *const [token_hex_len]u8) !void { 2621 const file = try self.dir.createFile(self.io, auto_login_name, .{}); 2622 defer file.close(self.io); 2623 try file.writeStreamingAll(self.io, token_hex); 2624 } 2625 2626 pub fn autoLogin(self: SessionStore, out: *[token_hex_len]u8) bool { 2627 out.* = self.auto_login orelse return false; 2628 return true; 2629 } 2630 2631 const auto_login_name = "auto-login"; 2632 2633 // a token is exactly token_hex_len hex chars. validating before using the 2634 // value as a path keeps attacker-supplied cookies from escaping the 2635 // sessions dir (e.g. via "/" or ".." bytes). 2636 fn isToken(token_hex: []const u8) bool { 2637 if (token_hex.len != token_hex_len) return false; 2638 for (token_hex) |c| if (!std.ascii.isHex(c)) return false; 2639 return true; 2640 } 2641 }; 2642