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Social cards for every page: og.g1t.sh1/**
2 * Social cards: the PNG a link to g1t shows in a chat, a post or a search
3 * result, at `https://og.g1t.sh`.
4 *
5 * GET /image?path=/<any page of g1t.sh>[&v=<version>]
status.g1t.sh with incident management, invites that land you in the workspace, settings as pages, usage without quotas6 * GET /docs?title=&section=&description=[&v=<version>]
Social cards for every page: og.g1t.sh7 *
8 * A page's card is looked up as an anonymous visitor would see the page,
9 * so nothing private ever reaches one (see `resolve.ts`). Cards are kept in
status.g1t.sh with incident management, invites that land you in the workspace, settings as pages, usage without quotas10 * the edge cache under the render version and the parameters that change
11 * them (see `cache.ts`). The site and the docs add `v`, which changes when
12 * the design does (`OG_RENDER_VERSION` in packages/contracts) or when what
13 * a card shows does, so a new logo or an edited title gets a new address.
Invite-only launch: sign in with GitHub, repository access and lifecycle, many emails, a new look14 *
15 * Also the `Screenshots` entrypoint, reached only through service
16 * bindings: a screenshot of each project's production, per deploy (see
17 * `capture.ts`).
Social cards for every page: og.g1t.sh18 */
Invite-only launch: sign in with GitHub, repository access and lifecycle, many emails, a new look19import { WorkerEntrypoint } from "cloudflare:workers";
Social cards for every page: og.g1t.sh20import { type ServiceBinding, identityClient, projectsClient, reposClient, workClient } from "@g1t/contracts";
Merge branch 'worktree-agent-a8752162fea25f63f' into spend-guardrails21import { type RateLimitBinding, clientAddress, isLimited } from "@g1t/contracts/rate-limits";
Social cards for every page: og.g1t.sh22import type { Font } from "satori/standalone";
23import resvgWasm from "@resvg/resvg-wasm/index_bg.wasm";
24import yogaWasm from "satori/yoga.wasm";
25
Invite-only launch: sign in with GitHub, repository access and lifecycle, many emails, a new look26import display500 from "./fonts/bricolage-grotesque-500.ttf";
27import display600 from "./fonts/bricolage-grotesque-600.ttf";
28import sans400 from "./fonts/hanken-grotesk-400.ttf";
29import sans500 from "./fonts/hanken-grotesk-500.ttf";
30import sans600 from "./fonts/hanken-grotesk-600.ttf";
31import sans700 from "./fonts/hanken-grotesk-700.ttf";
32import mono400 from "./fonts/ibm-plex-mono-400.ttf";
33import mono500 from "./fonts/ibm-plex-mono-500.ttf";
Social cards for every page: og.g1t.sh34import { cardPng } from "./render.ts";
Merge branch 'worktree-agent-ab9543c492a7ed481' into spend-guardrails35import { cacheKey, drawnKey } from "./cache.ts";
Production thumbnails follow each deploy, not each commit, and old ones are cleared daily36import { type Shot, screenshotOf, sweep, take } from "./capture.ts";
Invite-only launch: sign in with GitHub, repository access and lifecycle, many emails, a new look37import { parseShot } from "./screenshot.ts";
Merge branch 'worktree-agent-ab9543c492a7ed481' into spend-guardrails38import { BRAND, type Card, cardPath, docsCard, resolve } from "./resolve.ts";
Social cards for every page: og.g1t.sh39
40interface Env {
Workspace names and icons, and a component kit for every control41 /** Uploaded avatars by hash, with `{ contentType }`; written by identity. */
42 AVATARS: KVNamespace;
Social cards for every page: og.g1t.sh43 IDENTITY: ServiceBinding;
44 REPOS: ServiceBinding;
45 WORK: ServiceBinding;
46 PROJECTS: ServiceBinding;
Invite-only launch: sign in with GitHub, repository access and lifecycle, many emails, a new look47 /** Browser Rendering, for production screenshots. */
48 BROWSER: Fetcher;
49 /** Production screenshots, by app hostname. */
50 SCREENSHOTS: R2Bucket;
Merge branch 'worktree-agent-a8752162fea25f63f' into spend-guardrails51 /** Cards drawn per address (RATE_LIMITS in packages/contracts). Absent: no limit. */
52 OG_RENDER_LIMIT?: RateLimitBinding;
Social cards for every page: og.g1t.sh53}
54
Invite-only launch: sign in with GitHub, repository access and lifecycle, many emails, a new look55/**
56 * Production screenshots. `capture` is called by deployments when
57 * production goes live; `image` by the site, for a project's overview, which
58 * decides who may see it.
59 */
60export class Screenshots extends WorkerEntrypoint<Env> {
61 /** Takes the screenshot of `{ host, commit }` in the background. */
62 async capture(input: unknown): Promise<boolean> {
63 const request = parseShot(input);
64 if (!request) return false;
65 this.ctx.waitUntil(take(this.env, request));
66 return true;
67 }
68
69 /**
70 * The screenshot of `{ host, commit }`, taken now if it has not been, or
71 * the last one kept for that app. Its `commit` says which it is.
72 */
73 async image(input: unknown): Promise<Shot | null> {
74 const request = parseShot(input);
75 if (!request) return null;
76 return screenshotOf(this.env, request);
77 }
78}
79
80/*
81 * g1t's typefaces, as on the site (packages/theme), but static: the
82 * renderer takes no variable fonts. Bricolage is cut at the optical size
83 * of the headlines it sets on a card.
84 */
Social cards for every page: og.g1t.sh85const FONTS: Font[] = [
Invite-only launch: sign in with GitHub, repository access and lifecycle, many emails, a new look86 { name: "Hanken Grotesk", data: sans400, weight: 400, style: "normal" },
87 { name: "Hanken Grotesk", data: sans500, weight: 500, style: "normal" },
88 { name: "Hanken Grotesk", data: sans600, weight: 600, style: "normal" },
89 { name: "Hanken Grotesk", data: sans700, weight: 700, style: "normal" },
90 { name: "Bricolage Grotesque", data: display500, weight: 500, style: "normal" },
91 { name: "Bricolage Grotesque", data: display600, weight: 600, style: "normal" },
92 { name: "IBM Plex Mono", data: mono400, weight: 400, style: "normal" },
93 { name: "IBM Plex Mono", data: mono500, weight: 500, style: "normal" },
Social cards for every page: og.g1t.sh94];
95
96const ASSETS = { yoga: yogaWasm, resvg: resvgWasm, fonts: FONTS };
97
98/** Kept an hour by browsers and a day at the edge. */
99const CACHE_CONTROL = "public, max-age=3600, s-maxage=86400";
100/** When a service could not be reached: soon tried again. */
101const BRIEF_CACHE_CONTROL = "public, max-age=60";
102
status.g1t.sh with incident management, invites that land you in the workspace, settings as pages, usage without quotas103/** When even the brand card cannot be drawn: never kept, so the next request tries again. */
104const NO_STORE = "no-store";
Social cards for every page: og.g1t.sh105
106export default {
Production thumbnails follow each deploy, not each commit, and old ones are cleared daily107 /** Once a day: old screenshots out (capture.ts `sweep`). */
108 async scheduled(_event: ScheduledController, env: Env): Promise<void> {
109 const removed = await sweep(env).catch((error) => (console.error("og: sweep failed", error), 0));
110 if (removed) console.log(`og: removed ${removed} old screenshots`);
111 },
112
Social cards for every page: og.g1t.sh113 async fetch(request: Request, env: Env, ctx: ExecutionContext): Promise<Response> {
114 const url = new URL(request.url);
115 if (request.method !== "GET" && request.method !== "HEAD") {
116 return new Response("Method not allowed", { status: 405, headers: { allow: "GET, HEAD" } });
117 }
118 if (url.pathname === "/health") return new Response("ok");
119 if (url.pathname !== "/" && url.pathname !== "/image" && url.pathname !== "/docs") {
120 return new Response("Not found", { status: 404 });
121 }
122
123 const key = cacheKey(url);
124 const cache = (caches as unknown as { default: Cache }).default;
125 const hit = await cache.match(key);
126 if (hit) return hit;
127
128 // Every page without a card of its own shares the one brand card, so
129 // made-up paths cannot make the service draw it again and again.
130 const brandKey = cacheKey(new URL("/", url));
Merge branch 'worktree-agent-a8752162fea25f63f' into spend-guardrails131 // A miss looks the page up and draws its card: limited per address.
132 // Past the limit, the brand card, kept only briefly so the page's own
133 // card is asked for again later.
134 if (key !== brandKey && (await isLimited(env.OG_RENDER_LIMIT, `ip:${clientAddress(request)}`))) {
135 const brand = await cache.match(brandKey);
136 if (brand) return withCacheControl(brand, true);
137 const drawn = await brandCard(ctx, cache, brandKey);
138 return drawn.ok ? withCacheControl(drawn, true) : drawn;
139 }
140
Merge branch 'worktree-agent-ab9543c492a7ed481' into spend-guardrails141 const found = await lookUpCard(url, env);
142 const failed = found.kind === "brand" && found.failed === true;
143 if (found.kind === "brand" && key !== brandKey) {
Social cards for every page: og.g1t.sh144 const brand = await cache.match(brandKey);
145 if (brand) return withCacheControl(brand, failed);
146 }
Merge branch 'worktree-agent-ab9543c492a7ed481' into spend-guardrails147 // The same card under another address (another `v`): drawn once.
148 const drawn = found.kind === "brand" ? null : await drawnKey(url.origin, found);
149 const same = drawn ? await cache.match(drawn) : undefined;
150 if (same) {
151 ctx.waitUntil(cache.put(key, same.clone()));
152 return same;
153 }
154 const card = await withIcon(found, env);
Social cards for every page: og.g1t.sh155
156 let png: Uint8Array;
status.g1t.sh with incident management, invites that land you in the workspace, settings as pages, usage without quotas157 let fellBack = false;
Social cards for every page: og.g1t.sh158 try {
159 png = await cardPng(card, ASSETS);
160 } catch (error) {
161 console.error("og: rendering failed", url.pathname, error);
Workspace names and icons, and a component kit for every control162 try {
status.g1t.sh with incident management, invites that land you in the workspace, settings as pages, usage without quotas163 // An icon it could not draw is left out rather than losing the card;
164 // anything else gets the brand card, kept only briefly.
165 if ((card.kind === "workspace" || card.kind === "person") && card.icon) {
166 png = await cardPng({ ...card, icon: undefined }, ASSETS);
167 } else if (card.kind !== "brand") {
168 png = await cardPng(BRAND, ASSETS);
169 fellBack = true;
170 } else {
171 throw error;
172 }
173 } catch (again) {
174 console.error("og: the brand card could not be drawn either", again);
175 return new Response("The card could not be drawn", { status: 503, headers: { "cache-control": NO_STORE } });
Workspace names and icons, and a component kit for every control176 }
Social cards for every page: og.g1t.sh177 }
178 const response = new Response(png, {
179 headers: {
180 "content-type": "image/png",
181 "cache-control": CACHE_CONTROL,
182 "access-control-allow-origin": "*",
183 "x-content-type-options": "nosniff",
184 },
185 });
status.g1t.sh with incident management, invites that land you in the workspace, settings as pages, usage without quotas186 if (fellBack) return withCacheControl(response, true);
Social cards for every page: og.g1t.sh187 if (card.kind === "brand") {
188 ctx.waitUntil(cache.put(brandKey, response.clone()));
189 } else {
190 ctx.waitUntil(cache.put(key, response.clone()));
Merge branch 'worktree-agent-ab9543c492a7ed481' into spend-guardrails191 if (drawn) ctx.waitUntil(cache.put(drawn, response.clone()));
Social cards for every page: og.g1t.sh192 }
193 return withCacheControl(response, failed);
194 },
195} satisfies ExportedHandler<Env>;
196
197/** A card shown because a service failed is kept only briefly, by anyone. */
198function withCacheControl(response: Response, failed: boolean): Response {
199 if (!failed) return response;
200 const brief = new Response(response.body, response);
201 brief.headers.set("cache-control", BRIEF_CACHE_CONTROL);
202 return brief;
203}
204
Merge branch 'worktree-agent-a8752162fea25f63f' into spend-guardrails205/** The brand card when the cache has lost it: drawn once and kept again. */
206async function brandCard(ctx: ExecutionContext, cache: Cache, brandKey: string): Promise<Response> {
207 try {
208 const response = new Response(await cardPng(BRAND, ASSETS), {
209 headers: {
210 "content-type": "image/png",
211 "cache-control": CACHE_CONTROL,
212 "access-control-allow-origin": "*",
213 "x-content-type-options": "nosniff",
214 },
215 });
216 ctx.waitUntil(cache.put(brandKey, response.clone()));
217 return response;
218 } catch (error) {
219 console.error("og: the brand card could not be drawn", error);
220 return new Response("The card could not be drawn", { status: 503, headers: { "cache-control": NO_STORE } });
221 }
222}
223
Workspace names and icons, and a component kit for every control224/** What satori can draw: PNG and JPEG. A WebP or GIF icon is left off the card. */
225const DRAWABLE = new Set(["image/png", "image/jpeg"]);
226
Agents and memory, checks and conflicts, profiles, slug renames, custom domains227/** A workspace's or person's uploaded icon as a data URI, if it has one satori can draw. */
Workspace names and icons, and a component kit for every control228async function iconFor(env: Env, avatar: string | null | undefined): Promise<string | undefined> {
229 if (!avatar || !/^[0-9a-f]{64}$/.test(avatar)) return undefined;
230 try {
Merge branch 'worktree-agent-ab9543c492a7ed481' into spend-guardrails231 // An avatar's key is its hash: what is under it never changes.
Workspace names and icons, and a component kit for every control232 const { value, metadata } = await env.AVATARS.getWithMetadata<{ contentType?: string }>(avatar, {
233 type: "arrayBuffer",
Merge branch 'worktree-agent-ab9543c492a7ed481' into spend-guardrails234 cacheTtl: 86_400,
Workspace names and icons, and a component kit for every control235 });
236 const type = metadata?.contentType;
237 if (!value || !type || !DRAWABLE.has(type)) return undefined;
238 const bytes = new Uint8Array(value);
239 let binary = "";
240 for (let i = 0; i < bytes.length; i += 0x8000) binary += String.fromCharCode(...bytes.subarray(i, i + 0x8000));
241 return `data:${type};base64,${btoa(binary)}`;
242 } catch {
243 return undefined;
244 }
245}
246
Merge branch 'worktree-agent-ab9543c492a7ed481' into spend-guardrails247async function withIcon(card: Card, env: Env): Promise<Card> {
Agents and memory, checks and conflicts, profiles, slug renames, custom domains248 if (card.kind === "workspace" || card.kind === "person") return { ...card, icon: await iconFor(env, card.avatar) };
Workspace names and icons, and a component kit for every control249 return card;
250}
251
252async function lookUpCard(url: URL, env: Env): Promise<Card> {
Social cards for every page: og.g1t.sh253 if (url.pathname === "/docs") return docsCard(url.searchParams);
254 if (url.pathname === "/") return BRAND;
Merge branch 'worktree-agent-ab9543c492a7ed481' into spend-guardrails255 // The page whose card it is, as the cache key has it (cache.ts).
256 return resolve(cardPath(url.searchParams.get("path") ?? "/"), {
Social cards for every page: og.g1t.sh257 identity: identityClient(env.IDENTITY),
258 repos: reposClient(env.REPOS),
259 work: workClient(env.WORK),
260 projects: projectsClient(env.PROJECTS),
261 });
262}

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