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interface LinkRewrite {\n original: string;\n rewritten: string;\n}\n\ntype HostPredicate = (host: string) => boolean;\n\nconst TRAILING_PUNCTUATION = new Set([\n \".\",\n \",\",\n \"!\",\n \"?\",\n \")\",\n \"]\",\n \"}\",\n \":\",\n \";\",\n \"'\",\n '\"',\n]);\n\nconst IS_TWITTER_HOST: HostPredicate = (host) => {\n const normalized = host.toLowerCase();\n return (\n normalized === \"x.com\" ||\n normalized === \"www.x.com\" ||\n normalized === \"twitter.com\" ||\n normalized === \"www.twitter.com\" ||\n normalized === \"mobile.twitter.com\" ||\n normalized === \"m.twitter.com\"\n );\n};\n\nconst IS_ALT_TWITTER_HOST: HostPredicate = (host) => {\n const normalized = host.toLowerCase();\n return normalized === \"vxtwitter.com\" || normalized === \"fxtwitter.com\";\n};\n\nconst URL_MATCH = /https?:\\/\\/[^\\s<>\"']+/gi;\n\n/**\n * Extracts Twitter/X links from message content and returns their Nitter equivalents.\n *\n * The implementation follows a functional style so the pure core logic can be reused\n * both in unit tests and the imperative shell that talks to Discord.\n */\nexport function extractNitterRewrites(content: string): LinkRewrite[] {\n if (!content) return [];\n\n const matches = content.match(URL_MATCH);\n if (!matches) return [];\n\n const rewrites: LinkRewrite[] = [];\n const seen = new Set();\n\n for (const rawMatch of matches) {\n const cleaned = stripTrailingPunctuation(rawMatch);\n let parsed: URL;\n\n try {\n parsed = new URL(cleaned);\n } catch {\n continue;\n }\n\n const host = parsed.hostname.toLowerCase();\n\n if (!IS_TWITTER_HOST(host) && !IS_ALT_TWITTER_HOST(host)) {\n continue;\n }\n\n const rewrittenUrl = buildNitterUrl(parsed);\n if (!rewrittenUrl) continue;\n\n const fingerprint = rewrittenUrl;\n if (seen.has(fingerprint)) continue;\n\n seen.add(fingerprint);\n rewrites.push({ original: cleaned, rewritten: rewrittenUrl });\n }\n\n return rewrites;\n}\n\nfunction stripTrailingPunctuation(url: string): string {\n let end = url.length;\n while (end > 0 && TRAILING_PUNCTUATION.has(url[end - 1])) {\n end -= 1;\n }\n\n return url.slice(0, end);\n}\n\nfunction buildNitterUrl(original: URL): string | null {\n const rewritten = new URL(original.toString());\n rewritten.protocol = \"https:\";\n rewritten.hostname = \"nitter.net\";\n\n // Some Twitter URLs include redundant query params like s=20; they work on Nitter\n // as-is so we leave them untouched intentionally.\n return rewritten.toString();\n}\n",[18,64],"pulls","branches",1,"forks","envVars",{"_164":26,"_166":26},"connections",{"_164":26,"_165":26},"count","unfilledCount","emptyCount",{"_33":143,"_13":18,"_62":71,"_43":-5,"_35":36,"_146":147,"_152":24,"_37":217,"_39":26,"_65":72,"_144":-5,"_67":30,"_148":-5,"_180":218,"_17":219},{"_33":151,"_13":64,"_62":63,"_43":71,"_35":36,"_146":40,"_152":24,"_37":214,"_39":26,"_65":66,"_144":154,"_67":30,"_148":-5,"_180":215,"_17":216},{"_33":210,"_13":201,"_62":195,"_43":-5,"_35":36,"_146":158,"_152":24,"_37":211,"_39":26,"_65":72,"_144":-5,"_67":30,"_148":-5,"_180":212,"_17":213},{"_33":202,"_13":203,"_62":204,"_43":195,"_35":36,"_146":205,"_152":24,"_37":206,"_39":26,"_65":66,"_144":207,"_67":30,"_148":-5,"_180":208,"_17":209},{"_33":192,"_13":193,"_62":194,"_43":195,"_35":36,"_146":196,"_152":24,"_37":197,"_39":26,"_65":66,"_144":198,"_67":30,"_148":-5,"_180":199,"_17":200},{"_33":183,"_13":184,"_62":185,"_43":-5,"_35":36,"_146":186,"_152":24,"_37":187,"_39":26,"_65":188,"_144":189,"_67":30,"_148":-5,"_180":190,"_17":191},{"_33":174,"_13":175,"_62":85,"_43":-5,"_35":36,"_146":176,"_152":24,"_37":177,"_39":26,"_65":178,"_144":179,"_67":30,"_148":-5,"_180":181,"_17":182},"c5d5431a-b4d8-11f0-a3bf-0224a6c84d84","tests.http.ts",6,["D",1761750357243],"http","import { extractNitterRewrites } from \"./src/rewrite.ts\";\nimport { scenarios } from \"./tests/scenarios.ts\";\n\ninterface TestResult {\n name: string;\n ok: boolean;\n expected: unknown;\n actual: unknown;\n error?: string;\n}\n\nexport default async function (): Promise {\n const results: TestResult[] = [];\n\n for (const scenario of scenarios) {\n try {\n const actual = extractNitterRewrites(scenario.content);\n const ok = deepEqual(actual, scenario.expected);\n results.push({\n name: scenario.name,\n ok,\n expected: scenario.expected,\n actual,\n error: ok ? undefined : \"Mismatch between expected and actual rewrites\",\n });\n } catch (error) {\n results.push({\n name: scenario.name,\n ok: false,\n expected: scenario.expected,\n actual: null,\n error: error instanceof Error ? error.message : String(error),\n });\n }\n }\n\n const allPassed = results.every((result) => result.ok);\n\n return new Response(\n JSON.stringify({\n status: allPassed ? \"ok\" : \"failed\",\n passed: results.filter((result) => result.ok).length,\n failed: results.filter((result) => !result.ok).length,\n results,\n generatedAt: new Date().toISOString(),\n }),\n {\n status: allPassed ? 200 : 500,\n headers: {\n \"content-type\": \"application/json; charset=utf-8\",\n \"cache-control\": \"no-store\",\n },\n },\n );\n}\n\nfunction deepEqual(a: unknown, b: unknown): boolean {\n return JSON.stringify(a) === JSON.stringify(b);\n}\n","children",[],[175],"c5c5086a-b4d8-11f0-8c54-0224a6c84d84","bot.cron.ts","c5c50932-b4d8-11f0-8c54-0224a6c84d84",4,["D",1761750357235],"interval","import { blob } from \"https://esm.town/v/std/blob\";\nimport { extractNitterRewrites, type LinkRewrite } from \"./src/rewrite.ts\";\n\nconst DISCORD_API = \"https://discord.com/api/v10\";\nconst STATE_KEY = \"discordNitterBotState\";\n\nexport const cron = \"*/1 * * * *\"; // every minute\n\ninterface DiscordMessage {\n id: string;\n content: string;\n author: {\n id: string;\n username: string;\n bot?: boolean;\n };\n}\n\ninterface ChannelState {\n [channelId: string]: string | undefined;\n}\n\nexport default async function run() {\n const token = Deno.env.get(\"DISCORD_BOT_TOKEN\");\n if (!token) {\n throw new Error(\"Missing DISCORD_BOT_TOKEN environment variable\");\n }\n\n const channelIds = parseChannelIds(Deno.env.get(\"DISCORD_CHANNEL_IDS\"));\n if (channelIds.length === 0) {\n throw new Error(\"DISCORD_CHANNEL_IDS must include at least one channel id\");\n }\n\n const botUserId = Deno.env.get(\"DISCORD_BOT_USER_ID\") ?? null;\n\n const state = await readState();\n let hasChanges = false;\n\n for (const channelId of channelIds) {\n const lastSeen = state[channelId];\n const { latestId, responded } = await processChannel({\n channelId,\n token,\n lastSeen,\n botUserId,\n });\n\n if (latestId && latestId !== lastSeen) {\n state[channelId] = latestId;\n hasChanges = true;\n }\n\n if (responded.length > 0) {\n console.log(\n `[discord-nitter-bot] posted ${responded.length} mirror(s) in channel ${channelId}`,\n );\n }\n }\n\n if (hasChanges) {\n await blob.setJSON(STATE_KEY, state);\n }\n}\n\nasync function processChannel(opts: {\n channelId: string;\n token: string;\n lastSeen?: string;\n botUserId: string | null;\n}): Promise<{ latestId?: string; responded: string[] }> {\n let pageAfter = opts.lastSeen;\n let latestId = opts.lastSeen;\n const responded: string[] = [];\n\n for (;;) {\n const messages = await fetchMessages({\n channelId: opts.channelId,\n token: opts.token,\n after: pageAfter,\n });\n\n if (messages.length === 0) break;\n\n messages.sort((a, b) => compareSnowflakes(a.id, b.id));\n\n for (const message of messages) {\n latestId = message.id;\n\n if (!shouldProcessMessage(message, opts.botUserId)) continue;\n\n const rewrites = extractNitterRewrites(message.content);\n if (rewrites.length === 0) continue;\n\n const payload = buildReplyContent(message, rewrites);\n const sent = await sendReply({\n channelId: opts.channelId,\n messageId: message.id,\n token: opts.token,\n content: payload,\n mentionUserId: message.author.id,\n });\n\n if (sent) {\n responded.push(message.id);\n }\n }\n\n pageAfter = latestId;\n\n if (messages.length < 100) {\n break;\n }\n }\n\n return { latestId, responded };\n}\n\nfunction shouldProcessMessage(message: DiscordMessage, botUserId: string | null) {\n if (!message.content) return false;\n if (message.author?.bot) return false;\n if (botUserId && message.author?.id === botUserId) return false;\n return true;\n}\n\nasync function fetchMessages(opts: {\n channelId: string;\n token: string;\n after?: string;\n}): Promise {\n const params = new URLSearchParams({ limit: \"100\" });\n if (opts.after) params.set(\"after\", opts.after);\n\n const response = await fetch(\n `${DISCORD_API}/channels/${opts.channelId}/messages?${params.toString()}`,\n {\n headers: {\n Authorization: `Bot ${opts.token}`,\n },\n },\n );\n\n if (response.status === 429) {\n const retry = Number(response.headers.get(\"retry-after\") ?? \"1\") * 1000;\n console.warn(\n `[discord-nitter-bot] rate limited fetching messages; retrying after ${retry}ms`,\n );\n await delay(retry);\n return fetchMessages(opts);\n }\n\n if (!response.ok) {\n const text = await response.text();\n throw new Error(\n `Failed to fetch messages for channel ${opts.channelId}: ${response.status} ${text}`,\n );\n }\n\n const data = await response.json();\n return Array.isArray(data) ? data as DiscordMessage[] : [];\n}\n\nasync function sendReply(opts: {\n channelId: string;\n messageId: string;\n token: string;\n content: string;\n mentionUserId: string;\n}): Promise {\n const response = await fetch(\n `${DISCORD_API}/channels/${opts.channelId}/messages`,\n {\n method: \"POST\",\n headers: {\n Authorization: `Bot ${opts.token}`,\n \"Content-Type\": \"application/json\",\n },\n body: JSON.stringify({\n content: opts.content,\n message_reference: { message_id: opts.messageId },\n allowed_mentions: { users: [opts.mentionUserId] },\n }),\n },\n );\n\n if (response.status === 429) {\n const retry = Number(response.headers.get(\"retry-after\") ?? \"1\") * 1000;\n console.warn(\n `[discord-nitter-bot] rate limited sending reply; retrying after ${retry}ms`,\n );\n await delay(retry);\n return sendReply(opts);\n }\n\n if (!response.ok) {\n const text = await response.text();\n console.error(\n `Failed to send reply for message ${opts.messageId}: ${response.status} ${text}`,\n );\n return false;\n }\n\n return true;\n}\n\nfunction buildReplyContent(message: DiscordMessage, rewrites: LinkRewrite[]): string {\n const links = rewrites.map((rewrite) => rewrite.rewritten);\n const plural = links.length > 1 ? \"s\" : \"\";\n const bullets = links.map((link) => `• ${link}`).join(\"\\n\");\n return `<@${message.author.id}> mirror${plural}:\\n${bullets}`;\n}\n\nasync function readState(): Promise {\n try {\n const existing = await blob.getJSON(STATE_KEY);\n if (!existing || typeof existing !== \"object\") return {};\n return existing;\n } catch (error) {\n if (isNotFound(error)) {\n return {};\n }\n throw error;\n }\n}\n\nfunction parseChannelIds(value: string | undefined | null): string[] {\n if (!value) return [];\n return value.split(\",\").map((id) => id.trim()).filter(Boolean);\n}\n\nfunction compareSnowflakes(a: string, b: string): number {\n const bigintA = BigInt(a);\n const bigintB = BigInt(b);\n if (bigintA === bigintB) return 0;\n return bigintA < bigintB ? -1 : 1;\n}\n\nfunction isNotFound(error: unknown): boolean {\n return typeof error === \"object\" &&\n error !== null &&\n \"status\" in error &&\n (error as { status: number }).status === 404;\n}\n\nfunction delay(ms: number): Promise {\n return new Promise((resolve) => setTimeout(resolve, ms));\n}\n",[],[184],"c5cb4b62-b4d8-11f0-8fa6-0224a6c84d84","scenarios.ts","c5cb4c3e-b4d8-11f0-8fa6-0224a6c84d84","c56dca14-b4d8-11f0-9610-0224a6c84d84",5,["D",1761750357260],"import type { LinkRewrite } from \"../src/rewrite.ts\";\n\nexport interface RewriteScenario {\n name: string;\n content: string;\n expected: LinkRewrite[];\n}\n\nexport const scenarios: RewriteScenario[] = [\n {\n name: \"rewrites standard twitter.com links\",\n content: \"Check this out https://twitter.com/example/status/1234567890123456789\",\n expected: [{\n original: \"https://twitter.com/example/status/1234567890123456789\",\n rewritten: \"https://nitter.net/example/status/1234567890123456789\",\n }],\n },\n {\n name: \"rewrites x.com and preserves query params\",\n content: \"https://x.com/foo/status/1?s=20&t=abcd\",\n expected: [{\n original: \"https://x.com/foo/status/1?s=20&t=abcd\",\n rewritten: \"https://nitter.net/foo/status/1?s=20&t=abcd\",\n }],\n },\n {\n name: \"deduplicates identical links\",\n content: \"https://twitter.com/foo/status/1 https://twitter.com/foo/status/1\",\n expected: [{\n original: \"https://twitter.com/foo/status/1\",\n rewritten: \"https://nitter.net/foo/status/1\",\n }],\n },\n {\n name: \"strips trailing punctuation from matches\",\n content: \"Did you see this? https://twitter.com/foo/status/1). Wild!\",\n expected: [{\n original: \"https://twitter.com/foo/status/1\",\n rewritten: \"https://nitter.net/foo/status/1\",\n }],\n },\n {\n name: \"supports alternate twitter frontends\",\n content: \"mirror https://vxtwitter.com/foo/status/1, please\",\n expected: [{\n original: \"https://vxtwitter.com/foo/status/1\",\n rewritten: \"https://nitter.net/foo/status/1\",\n }],\n },\n {\n name: \"ignores unrelated links\",\n content: \"https://example.com and https://youtube.com/watch?v=1\",\n expected: [],\n },\n];\n",[],[201,193],"tests","c5a584e0-b4d8-11f0-9680-0224a6c84d84","rewrite.test.ts","c5a5858a-b4d8-11f0-9680-0224a6c84d84",3,["D",1761750357030],"import { assertEquals } from \"https://deno.land/std@0.224.0/assert/mod.ts\";\nimport { extractNitterRewrites } from \"../src/rewrite.ts\";\nimport { scenarios } from \"./scenarios.ts\";\n\nfor (const scenario of scenarios) {\n Deno.test(scenario.name, () => {\n const rewrites = extractNitterRewrites(scenario.content);\n assertEquals(rewrites, scenario.expected);\n });\n}\n",[],[201,203],"c56dc94c-b4d8-11f0-9610-0224a6c84d84",["D",1761750356662],[170,171],[201],["D",1761750357244],[],[18,64],["D",1761750356846],[168],[18],["D",1761746098901],{"_11":12,"_121":70},{"_11":12,"_117":-5,"_69":70,"_31":68,"_118":119,"_120":30},{"_39":40,"_13":16,"_33":36,"_109":74,"_110":-5,"_111":-5,"_112":-5,"_113":-5,"_114":-5,"_115":14,"_116":12},"ctx",{"_52":-5,"_140":257,"_258":259,"_260":261,"_262":30,"_263":30,"_264":30,"_265":24,"_266":-5,"_267":-7,"_268":-7,"_269":26,"_270":30,"_271":30,"_272":-5,"_273":30,"_274":30,"_275":30,"_276":-5},"ENV",{"_228":229,"_230":231,"_232":16,"_233":234,"_235":236,"_237":238,"_239":240,"_241":242,"_243":244,"_245":246,"_247":248,"_249":250,"_251":252,"_253":254,"_255":256},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

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