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TelegramUpdate {\n message?: {\n chat: {\n id: number;\n };\n text?: string;\n };\n}\n\ninterface DuckApiResponse {\n url: string;\n message: string;\n}\n\ninterface TelegramApiResponse {\n ok: boolean;\n result?: T;\n description?: string;\n}\n\nconst DUCK_API_URL = \"https://random-d.uk/api/random\";\nconst TELEGRAM_API_BASE = \"https://api.telegram.org/bot\";\n\n// Read secrets from Val Town env vars (left sidebar -> Environment Variables)\nconst BOT_TOKEN = Deno.env.get(\"TELEGRAM_BOT_TOKEN\");\nif (!BOT_TOKEN) {\n throw new Error(\"Missing TELEGRAM_BOT_TOKEN environment variable\");\n}\n\n// Optional: set your own secret in env as TELEGRAM_WEBHOOK_SECRET.\n// If omitted, we derive one from the bot token (similar to the Val Town docs example).\nconst WEBHOOK_SECRET = Deno.env.get(\"TELEGRAM_WEBHOOK_SECRET\") ??\n BOT_TOKEN.split(\":\")[1];\n\nif (!WEBHOOK_SECRET) {\n throw new Error(\n \"Could not derive TELEGRAM_WEBHOOK_SECRET from TELEGRAM_BOT_TOKEN. Set TELEGRAM_WEBHOOK_SECRET explicitly.\",\n );\n}\n\n// Best-effort in-memory cache; may reset on cold starts (that's fine).\nlet webhookConfiguredForUrl: string | null = null;\n\nasync function telegramApi(\n method: string,\n body: Record,\n): Promise {\n const url = `${TELEGRAM_API_BASE}${BOT_TOKEN}/${method}`;\n\n const response = await fetch(url, {\n method: \"POST\",\n headers: { \"Content-Type\": \"application/json\" },\n body: JSON.stringify(body),\n });\n\n if (!response.ok) {\n throw new Error(`Telegram API HTTP ${response.status} on ${method}`);\n }\n\n const data = (await response.json()) as TelegramApiResponse;\n\n if (!data.ok) {\n throw new Error(\n `Telegram API error on ${method}: ${data.description ?? \"Unknown error\"}`,\n );\n }\n\n return data.result as T;\n}\n\nasync function ensureWebhook(url: string): Promise {\n if (webhookConfiguredForUrl === url) return;\n\n // Telegram supports secret_token and will echo it back in a request header.\n await telegramApi(\"setWebhook\", {\n url,\n secret_token: WEBHOOK_SECRET,\n allowed_updates: [\"message\"],\n });\n\n webhookConfiguredForUrl = url;\n}\n\nasync function getRandomDuckUrl(): Promise {\n const response = await fetch(DUCK_API_URL);\n if (!response.ok) {\n throw new Error(`Duck API HTTP ${response.status}`);\n }\n\n const data = (await response.json()) as DuckApiResponse;\n if (!data.url) {\n throw new Error(\"Duck API returned no URL\");\n }\n\n return data.url;\n}\n\nasync function sendPhoto(chatId: number, photoUrl: string): Promise {\n await telegramApi(\"sendPhoto\", {\n chat_id: chatId,\n photo: photoUrl,\n caption: \"🦆 Quack!\",\n });\n}\n\nasync function handleUpdate(update: TelegramUpdate): Promise {\n const message = update.message;\n if (!message?.text) return;\n\n const chatId = message.chat.id;\n const text = message.text.trim();\n\n if (text === \"/duck\" || text.startsWith(\"/duck@\")) {\n const duckUrl = await getRandomDuckUrl();\n await sendPhoto(chatId, duckUrl);\n }\n}\n\nexport default async function (req: Request): Promise {\n try {\n // Auto-register webhook on first request (or after a cold start)\n // This matches the Val Town Telegram guide pattern.\n await ensureWebhook(req.url);\n\n if (req.method !== \"POST\") {\n return new Response(\"Duck Bot is running! 🦆\", { status: 200 });\n }\n\n // Validate Telegram webhook secret (recommended)\n const incomingSecret = req.headers.get(\"x-telegram-bot-api-secret-token\");\n if (incomingSecret !== WEBHOOK_SECRET) {\n return new Response(\"Unauthorized\", { status: 401 });\n }\n\n const update = (await req.json()) as TelegramUpdate;\n await handleUpdate(update);\n\n // Telegram expects a quick 2xx response\n return new Response(\"OK\", { status: 200 });\n } catch (err) {\n console.error(err);\n return new Response(\"Error processing update\", { status: 500 });\n }\n}","deleted","label",[102],"permalink","https://www.val.town/x/tionis/duck-bot/code/main.ts","extension","actionData","errors"]