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A token (any token, no scopes needed for public data) raises it to\n * 5,000/hour. We surface the remaining count so the page can say which\n * regime it's in rather than just failing.\n * 2. **Caching.** Most page views should never touch GitHub at all, so a\n * snapshot is cached in blob storage for a few minutes. See readCache().\n */\nimport { blob } from \"https://esm.town/v/std/blob/main.ts\";\n\nconst API = \"https://api.github.com\";\nconst USER_AGENT = \"val-town-github-stars\";\n\n/** Optional. Without it we're on the 60/hour unauthenticated budget. */\nexport const TOKEN_VAR = \"GITHUB_TOKEN\";\n/** Optional. Whose stars to show; defaults to the val owner's handle. */\nexport const USER_VAR = \"GITHUB_USER\";\nexport const DEFAULT_USER = \"rodrigoalma\";\n\n/** GitHub's maximum page size, and how many pages we're willing to walk. */\nconst PER_PAGE = 100;\nconst MAX_PAGES = 10;\n\n/** How long a cached snapshot stays fresh. */\nconst CACHE_TTL_MS = 5 * 60 * 1000;\n\n// ── Wire types (GitHub's shape) ─────────────────────────────────\n\ninterface GitHubUser {\n login: string;\n name: string | null;\n avatar_url: string;\n html_url: string;\n bio: string | null;\n location: string | null;\n blog: string | null;\n public_repos: number;\n followers: number;\n following: number;\n}\n\ninterface GitHubRepo {\n id: number;\n name: string;\n html_url: string;\n description: string | null;\n language: string | null;\n topics?: string[];\n stargazers_count: number;\n forks_count: number;\n archived: boolean;\n fork: boolean;\n homepage: string | null;\n pushed_at: string;\n owner: { login: string; avatar_url: string };\n}\n\n/**\n * With the `star+json` media type each item is wrapped as\n * `{ starred_at, repo }`. We ask for that header, but we also accept a bare\n * repo object so the code keeps working if GitHub ever ignores it.\n */\ntype StarredItem = { starred_at?: string; repo?: GitHubRepo } & Partial;\n\n// ── Wire types (ours) ───────────────────────────────────────────\n\n/** One starred repo, flattened to only what the page renders. */\nexport interface Star {\n id: number;\n name: string;\n owner: string;\n ownerAvatar: string;\n url: string;\n description: string | null;\n language: string | null;\n topics: string[];\n stars: number;\n forks: number;\n archived: boolean;\n isFork: boolean;\n homepage: string | null;\n pushedAt: string;\n starredAt: string;\n}\n\nexport interface Profile {\n login: string;\n name: string | null;\n avatarUrl: string;\n htmlUrl: string;\n bio: string | null;\n location: string | null;\n blog: string | null;\n publicRepos: number;\n followers: number;\n following: number;\n}\n\nexport interface RateLimit {\n limit: number;\n remaining: number;\n resetAt: string | null;\n}\n\nexport interface StarSnapshot {\n user: string;\n profile: Profile;\n stars: Star[];\n languages: { name: string; count: number }[];\n fetchedAt: string;\n rateLimit: RateLimit | null;\n /** True when the user has more stars than MAX_PAGES × PER_PAGE. */\n truncated: boolean;\n authenticated: boolean;\n}\n\nexport class GitHubError extends Error {\n status: number;\n rateLimited: boolean;\n rateLimit: RateLimit | null;\n\n constructor(\n message: string,\n status: number,\n rateLimited: boolean,\n rateLimit: RateLimit | null,\n ) {\n super(message);\n this.name = \"GitHubError\";\n this.status = status;\n this.rateLimited = rateLimited;\n this.rateLimit = rateLimit;\n }\n}\n\n// ── Config ──────────────────────────────────────────────────────\n\nexport function tokenValue(): string {\n return Deno.env.get(TOKEN_VAR)?.trim() ?? \"\";\n}\n\nexport function hasToken(): boolean {\n return tokenValue().length > 0;\n}\n\nexport function configuredUser(): string {\n return Deno.env.get(USER_VAR)?.trim() || DEFAULT_USER;\n}\n\nfunction requestHeaders(): Record {\n const headers: Record = {\n Accept: \"application/vnd.github.star+json\",\n \"User-Agent\": USER_AGENT,\n \"X-GitHub-Api-Version\": \"2022-11-28\",\n };\n const token = tokenValue();\n if (token) headers.Authorization = `Bearer ${token}`;\n return headers;\n}\n\nfunction readRateLimit(res: Response): RateLimit | null {\n const int = (name: string): number | null => {\n const raw = res.headers.get(name);\n if (raw === null) return null;\n const value = Number(raw);\n return Number.isFinite(value) ? value : null;\n };\n const limit = int(\"x-ratelimit-limit\");\n const remaining = int(\"x-ratelimit-remaining\");\n if (limit === null && remaining === null) return null;\n const reset = int(\"x-ratelimit-reset\");\n return {\n limit: limit ?? 0,\n remaining: remaining ?? 0,\n resetAt: reset === null ? null : new Date(reset * 1000).toISOString(),\n };\n}\n\n// ── Requests ────────────────────────────────────────────────────\n\nasync function getJson(path: string): Promise<{ data: T; rateLimit: RateLimit | null }> {\n const res = await fetch(`${API}${path}`, { headers: requestHeaders() });\n const rateLimit = readRateLimit(res);\n\n if (!res.ok) {\n // GitHub answers an exhausted budget with 403 (or 429 for secondary\n // limits), so status alone doesn't tell us — check the remaining count too.\n const rateLimited = res.status === 403 || res.status === 429;\n let detail = \"\";\n try {\n const body = await res.json();\n if (typeof body?.message === \"string\") detail = body.message;\n } catch {\n // Not JSON — fall through to the generic message.\n }\n throw new GitHubError(\n detail || `GitHub responded ${res.status}`,\n res.status,\n rateLimited,\n rateLimit,\n );\n }\n\n return { data: await res.json() as T, rateLimit };\n}\n\nfunction toStar(item: StarredItem): Star | null {\n const repo = item.repo ?? item;\n if (!repo?.id || !repo.name || !repo.owner) return null;\n return {\n id: repo.id,\n name: repo.name,\n owner: repo.owner.login,\n ownerAvatar: repo.owner.avatar_url,\n url: repo.html_url,\n description: repo.description,\n language: repo.language,\n topics: repo.topics ?? [],\n stars: repo.stargazers_count,\n forks: repo.forks_count,\n archived: repo.archived,\n isFork: repo.fork,\n homepage: repo.homepage,\n pushedAt: repo.pushed_at,\n // Without the star+json media type GitHub omits starred_at; pushed_at is\n // the closest thing we have, and it keeps the sort stable.\n starredAt: item.starred_at ?? repo.pushed_at,\n };\n}\n\nfunction tallyLanguages(stars: Star[]): { name: string; count: number }[] {\n const counts = new Map();\n for (const star of stars) {\n if (!star.language) continue;\n counts.set(star.language, (counts.get(star.language) ?? 0) + 1);\n }\n return [...counts.entries()]\n .map(([name, count]) => ({ name, count }))\n .sort((a, b) => b.count - a.count || a.name.localeCompare(b.name));\n}\n\n/**\n * Read a user's profile and every repo they've starred.\n *\n * Throws GitHubError for anything GitHub says no to, so the caller can tell a\n * missing user (404) from an exhausted rate limit (403) from a real failure.\n */\nexport async function fetchStars(user: string): Promise {\n const slug = encodeURIComponent(user);\n const profileRes = await getJson(`/users/${slug}`);\n const profile = profileRes.data;\n\n const stars: Star[] = [];\n let rateLimit = profileRes.rateLimit;\n let truncated = false;\n\n for (let page = 1; page <= MAX_PAGES; page++) {\n const { data, rateLimit: pageLimit } = await getJson(\n `/users/${slug}/starred?per_page=${PER_PAGE}&page=${page}&sort=created&direction=desc`,\n );\n rateLimit = pageLimit;\n for (const item of data) {\n const star = toStar(item);\n if (star) stars.push(star);\n }\n if (data.length < PER_PAGE) break;\n if (page === MAX_PAGES) truncated = true;\n }\n\n return {\n user: profile.login,\n profile: {\n login: profile.login,\n name: profile.name,\n avatarUrl: profile.avatar_url,\n htmlUrl: profile.html_url,\n bio: profile.bio,\n location: profile.location,\n blog: profile.blog,\n publicRepos: profile.public_repos,\n followers: profile.followers,\n following: profile.following,\n },\n stars,\n languages: tallyLanguages(stars),\n fetchedAt: new Date().toISOString(),\n rateLimit,\n truncated,\n authenticated: hasToken(),\n };\n}\n\n// ── Cache ───────────────────────────────────────────────────────\n// A cache miss costs one GitHub request; a hit costs none. 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