{"version":3,"file":"index.mjs","names":["DEFAULT_LONG_POLL_TIMEOUT_MS"],"sources":["../src/api/client.ts","../src/api/types.ts","../src/auth/qr-login.ts","../src/cdn/aes-ecb.ts","../src/cdn/cdn-url.ts","../src/cdn/cdn-download.ts","../src/media/download.ts","../src/util/mime.ts","../src/cdn/cdn-upload.ts","../src/media/upload.ts","../src/util/random.ts","../src/media/send.ts","../src/monitor.ts","../src/client.ts"],"sourcesContent":["/**\n * Low-level HTTP API client for the WeChat iLink bot protocol.\n *\n * Endpoints (all POST JSON):\n * - ilink/bot/getupdates — long-poll for new messages\n * - ilink/bot/sendmessage — send a message (text/image/video/file)\n * - ilink/bot/getuploadurl — get CDN upload pre-signed URL\n * - ilink/bot/getconfig — get account config (typing ticket, etc.)\n * - ilink/bot/sendtyping — send/cancel typing indicator\n * - ilink/bot/get_bot_qrcode — initiate QR code login (GET)\n * - ilink/bot/get_qrcode_status — poll QR scan status (GET)\n */\nimport crypto from \"node:crypto\";\n\nimport type {\n BaseInfo,\n GetUpdatesResp,\n GetUploadUrlReq,\n GetUploadUrlResp,\n GetConfigResp,\n SendMessageReq,\n SendTypingReq,\n QRCodeResponse,\n QRCodeStatusResponse,\n} from \"./types.js\";\n\n// ---------------------------------------------------------------------------\n// Constants\n// ---------------------------------------------------------------------------\n\nexport const DEFAULT_BASE_URL = \"https://ilinkai.weixin.qq.com\";\nexport const CDN_BASE_URL = \"https://novac2c.cdn.weixin.qq.com/c2c\";\n\n/** Default long-poll timeout for getUpdates requests. */\nconst DEFAULT_LONG_POLL_TIMEOUT_MS = 35_000;\n/** Default timeout for regular API requests. */\nconst DEFAULT_API_TIMEOUT_MS = 15_000;\n/** Default timeout for lightweight requests (getConfig, sendTyping). */\nconst DEFAULT_CONFIG_TIMEOUT_MS = 10_000;\n/** Default client-side timeout for get_qrcode_status long-poll. */\nconst QR_LONG_POLL_TIMEOUT_MS = 35_000;\n/** Default bot_type value. */\nexport const DEFAULT_BOT_TYPE = \"3\";\n\n// ---------------------------------------------------------------------------\n// Helpers\n// ---------------------------------------------------------------------------\n\nfunction ensureTrailingSlash(url: string): string {\n return url.endsWith(\"/\") ? url : `${url}/`;\n}\n\n/** X-WECHAT-UIN header: random uint32 -> decimal string -> base64. */\nfunction randomWechatUin(): string {\n const uint32 = crypto.randomBytes(4).readUInt32BE(0);\n return Buffer.from(String(uint32), \"utf-8\").toString(\"base64\");\n}\n\n// ---------------------------------------------------------------------------\n// API client options\n// ---------------------------------------------------------------------------\n\nexport interface ApiClientOptions {\n baseUrl?: string;\n cdnBaseUrl?: string;\n token?: string;\n /** Channel version string sent as base_info.channel_version. */\n channelVersion?: string;\n /** Optional SKRouteTag header. */\n routeTag?: string;\n}\n\n// ---------------------------------------------------------------------------\n// ApiClient\n// ---------------------------------------------------------------------------\n\nexport class ApiClient {\n readonly baseUrl: string;\n readonly cdnBaseUrl: string;\n private token?: string;\n private channelVersion: string;\n private routeTag?: string;\n\n constructor(opts: ApiClientOptions = {}) {\n this.baseUrl = opts.baseUrl ?? DEFAULT_BASE_URL;\n this.cdnBaseUrl = opts.cdnBaseUrl ?? CDN_BASE_URL;\n this.token = opts.token;\n this.channelVersion = opts.channelVersion ?? \"standalone-0.1.0\";\n this.routeTag = opts.routeTag;\n }\n\n /** Update the bearer token (after QR login). */\n setToken(token: string): void {\n this.token = token;\n }\n\n getToken(): string | undefined {\n return this.token;\n }\n\n // -----------------------------------------------------------------------\n // Internal helpers\n // -----------------------------------------------------------------------\n\n private buildBaseInfo(): BaseInfo {\n return { channel_version: this.channelVersion };\n }\n\n private buildHeaders(bodyStr: string): Record {\n const headers: Record = {\n \"Content-Type\": \"application/json\",\n AuthorizationType: \"ilink_bot_token\",\n \"Content-Length\": String(Buffer.byteLength(bodyStr, \"utf-8\")),\n \"X-WECHAT-UIN\": randomWechatUin(),\n };\n if (this.token?.trim()) {\n headers.Authorization = `Bearer ${this.token.trim()}`;\n }\n if (this.routeTag) {\n headers.SKRouteTag = this.routeTag;\n }\n return headers;\n }\n\n /**\n * POST JSON to an iLink API endpoint with timeout + abort.\n */\n private async apiFetch(params: {\n endpoint: string;\n body: string;\n timeoutMs: number;\n }): Promise {\n const base = ensureTrailingSlash(this.baseUrl);\n const url = new URL(params.endpoint, base);\n const headers = this.buildHeaders(params.body);\n\n const controller = new AbortController();\n const timer = setTimeout(() => controller.abort(), params.timeoutMs);\n try {\n const res = await fetch(url.toString(), {\n method: \"POST\",\n headers,\n body: params.body,\n signal: controller.signal,\n });\n clearTimeout(timer);\n const rawText = await res.text();\n if (!res.ok) {\n throw new Error(`API ${params.endpoint} ${res.status}: ${rawText}`);\n }\n return rawText;\n } catch (err) {\n clearTimeout(timer);\n throw err;\n }\n }\n\n // -----------------------------------------------------------------------\n // Public API methods\n // -----------------------------------------------------------------------\n\n /**\n * Long-poll for new messages. Returns empty response on client-side timeout\n * (normal for long-poll).\n */\n async getUpdates(\n getUpdatesBuf: string,\n timeoutMs?: number,\n ): Promise {\n const timeout = timeoutMs ?? DEFAULT_LONG_POLL_TIMEOUT_MS;\n try {\n const rawText = await this.apiFetch({\n endpoint: \"ilink/bot/getupdates\",\n body: JSON.stringify({\n get_updates_buf: getUpdatesBuf,\n base_info: this.buildBaseInfo(),\n }),\n timeoutMs: timeout,\n });\n return JSON.parse(rawText) as GetUpdatesResp;\n } catch (err) {\n if (err instanceof Error && err.name === \"AbortError\") {\n return { ret: 0, msgs: [], get_updates_buf: getUpdatesBuf };\n }\n throw err;\n }\n }\n\n /** Send a message downstream. */\n async sendMessage(req: SendMessageReq): Promise {\n await this.apiFetch({\n endpoint: \"ilink/bot/sendmessage\",\n body: JSON.stringify({ ...req, base_info: this.buildBaseInfo() }),\n timeoutMs: DEFAULT_API_TIMEOUT_MS,\n });\n }\n\n /** Get a pre-signed CDN upload URL. */\n async getUploadUrl(\n req: GetUploadUrlReq,\n ): Promise {\n const rawText = await this.apiFetch({\n endpoint: \"ilink/bot/getuploadurl\",\n body: JSON.stringify({\n ...req,\n base_info: this.buildBaseInfo(),\n }),\n timeoutMs: DEFAULT_API_TIMEOUT_MS,\n });\n return JSON.parse(rawText) as GetUploadUrlResp;\n }\n\n /** Fetch bot config (includes typing_ticket) for a given user. */\n async getConfig(\n ilinkUserId: string,\n contextToken?: string,\n ): Promise {\n const rawText = await this.apiFetch({\n endpoint: \"ilink/bot/getconfig\",\n body: JSON.stringify({\n ilink_user_id: ilinkUserId,\n context_token: contextToken,\n base_info: this.buildBaseInfo(),\n }),\n timeoutMs: DEFAULT_CONFIG_TIMEOUT_MS,\n });\n return JSON.parse(rawText) as GetConfigResp;\n }\n\n /** Send a typing indicator. */\n async sendTyping(req: SendTypingReq): Promise {\n await this.apiFetch({\n endpoint: \"ilink/bot/sendtyping\",\n body: JSON.stringify({\n ...req,\n base_info: this.buildBaseInfo(),\n }),\n timeoutMs: DEFAULT_CONFIG_TIMEOUT_MS,\n });\n }\n\n // -----------------------------------------------------------------------\n // QR code login (these use GET, not POST)\n // -----------------------------------------------------------------------\n\n /** Fetch a new QR code for bot login. */\n async getQRCode(botType?: string): Promise {\n const base = ensureTrailingSlash(this.baseUrl);\n const bt = botType ?? DEFAULT_BOT_TYPE;\n const url = new URL(\n `ilink/bot/get_bot_qrcode?bot_type=${encodeURIComponent(bt)}`,\n base,\n );\n\n const headers: Record = {};\n if (this.routeTag) {\n headers.SKRouteTag = this.routeTag;\n }\n\n const res = await fetch(url.toString(), { headers });\n if (!res.ok) {\n const body = await res.text().catch(() => \"(unreadable)\");\n throw new Error(\n `Failed to fetch QR code: ${res.status} ${res.statusText}: ${body}`,\n );\n }\n return (await res.json()) as QRCodeResponse;\n }\n\n /**\n * Long-poll the QR code scan status.\n * Returns `{ status: \"wait\" }` on client-side timeout.\n */\n async pollQRCodeStatus(\n qrcode: string,\n ): Promise {\n const base = ensureTrailingSlash(this.baseUrl);\n const url = new URL(\n `ilink/bot/get_qrcode_status?qrcode=${encodeURIComponent(qrcode)}`,\n base,\n );\n\n const headers: Record = {\n \"iLink-App-ClientVersion\": \"1\",\n };\n if (this.routeTag) {\n headers.SKRouteTag = this.routeTag;\n }\n\n const controller = new AbortController();\n const timer = setTimeout(\n () => controller.abort(),\n QR_LONG_POLL_TIMEOUT_MS,\n );\n try {\n const res = await fetch(url.toString(), {\n headers,\n signal: controller.signal,\n });\n clearTimeout(timer);\n const rawText = await res.text();\n if (!res.ok) {\n throw new Error(\n `Failed to poll QR status: ${res.status} ${res.statusText}: ${rawText}`,\n );\n }\n return JSON.parse(rawText) as QRCodeStatusResponse;\n } catch (err) {\n clearTimeout(timer);\n if (err instanceof Error && err.name === \"AbortError\") {\n return { status: \"wait\" };\n }\n throw err;\n }\n }\n}\n","/**\n * WeChat iLink bot protocol types.\n *\n * Reverse-engineered from @tencent-weixin/openclaw-weixin.\n * The backend API uses JSON over HTTP; byte fields are base64 strings in JSON.\n */\n\n// ---------------------------------------------------------------------------\n// Enums / constants\n// ---------------------------------------------------------------------------\n\nexport const UploadMediaType = {\n IMAGE: 1,\n VIDEO: 2,\n FILE: 3,\n VOICE: 4,\n} as const;\nexport type UploadMediaType = (typeof UploadMediaType)[keyof typeof UploadMediaType];\n\nexport const MessageType = {\n NONE: 0,\n USER: 1,\n BOT: 2,\n} as const;\nexport type MessageType = (typeof MessageType)[keyof typeof MessageType];\n\nexport const MessageItemType = {\n NONE: 0,\n TEXT: 1,\n IMAGE: 2,\n VOICE: 3,\n FILE: 4,\n VIDEO: 5,\n} as const;\nexport type MessageItemType = (typeof MessageItemType)[keyof typeof MessageItemType];\n\nexport const MessageState = {\n NEW: 0,\n GENERATING: 1,\n FINISH: 2,\n} as const;\nexport type MessageState = (typeof MessageState)[keyof typeof MessageState];\n\nexport const TypingStatus = {\n TYPING: 1,\n CANCEL: 2,\n} as const;\nexport type TypingStatus = (typeof TypingStatus)[keyof typeof TypingStatus];\n\n// ---------------------------------------------------------------------------\n// Common\n// ---------------------------------------------------------------------------\n\n/** Metadata attached to every outgoing CGI request. */\nexport interface BaseInfo {\n channel_version?: string;\n}\n\n// ---------------------------------------------------------------------------\n// CDN / Media references\n// ---------------------------------------------------------------------------\n\n/** CDN media reference; aes_key is base64-encoded bytes in JSON. */\nexport interface CDNMedia {\n /** Encrypted parameters for CDN download/upload. */\n encrypt_query_param?: string;\n /** Base64-encoded AES-128 key. */\n aes_key?: string;\n /** 0 = only encrypt fileid, 1 = packed thumb/mid info. */\n encrypt_type?: number;\n}\n\nexport interface TextItem {\n text?: string;\n}\n\nexport interface ImageItem {\n /** Original image CDN reference. */\n media?: CDNMedia;\n /** Thumbnail CDN reference. */\n thumb_media?: CDNMedia;\n /** Raw AES-128 key as hex string (16 bytes); preferred over media.aes_key for inbound decryption. */\n aeskey?: string;\n url?: string;\n mid_size?: number;\n thumb_size?: number;\n thumb_height?: number;\n thumb_width?: number;\n hd_size?: number;\n}\n\nexport interface VoiceItem {\n media?: CDNMedia;\n /** Voice encoding: 1=pcm, 2=adpcm, 3=feature, 4=speex, 5=amr, 6=silk, 7=mp3, 8=ogg-speex */\n encode_type?: number;\n bits_per_sample?: number;\n /** Sample rate in Hz. */\n sample_rate?: number;\n /** Duration in milliseconds. */\n playtime?: number;\n /** Speech-to-text content (if available). */\n text?: string;\n}\n\nexport interface FileItem {\n media?: CDNMedia;\n file_name?: string;\n md5?: string;\n /** File size as string. */\n len?: string;\n}\n\nexport interface VideoItem {\n media?: CDNMedia;\n video_size?: number;\n play_length?: number;\n video_md5?: string;\n thumb_media?: CDNMedia;\n thumb_size?: number;\n thumb_height?: number;\n thumb_width?: number;\n}\n\nexport interface RefMessage {\n message_item?: MessageItem;\n /** Summary text. */\n title?: string;\n}\n\nexport interface MessageItem {\n type?: number;\n create_time_ms?: number;\n update_time_ms?: number;\n is_completed?: boolean;\n msg_id?: string;\n ref_msg?: RefMessage;\n text_item?: TextItem;\n image_item?: ImageItem;\n voice_item?: VoiceItem;\n file_item?: FileItem;\n video_item?: VideoItem;\n}\n\n// ---------------------------------------------------------------------------\n// WeixinMessage — the unified message envelope\n// ---------------------------------------------------------------------------\n\nexport interface WeixinMessage {\n seq?: number;\n message_id?: number;\n from_user_id?: string;\n to_user_id?: string;\n client_id?: string;\n create_time_ms?: number;\n update_time_ms?: number;\n delete_time_ms?: number;\n session_id?: string;\n group_id?: string;\n /** 1 = USER, 2 = BOT */\n message_type?: number;\n /** 0 = NEW, 1 = GENERATING, 2 = FINISH */\n message_state?: number;\n item_list?: MessageItem[];\n /** Conversation context token — must be echoed verbatim in replies. */\n context_token?: string;\n}\n\n// ---------------------------------------------------------------------------\n// getUpdates (long-poll)\n// ---------------------------------------------------------------------------\n\nexport interface GetUpdatesReq {\n /** Full context buf cached locally; send \"\" on first request. */\n get_updates_buf?: string;\n base_info?: BaseInfo;\n}\n\nexport interface GetUpdatesResp {\n ret?: number;\n /** Error code from server (e.g. -14 = session timeout). */\n errcode?: number;\n errmsg?: string;\n msgs?: WeixinMessage[];\n /** Full context buf to cache locally and send on next request. */\n get_updates_buf?: string;\n /** Server-suggested timeout (ms) for the next long-poll. */\n longpolling_timeout_ms?: number;\n}\n\n// ---------------------------------------------------------------------------\n// sendMessage\n// ---------------------------------------------------------------------------\n\nexport interface SendMessageReq {\n msg?: WeixinMessage;\n base_info?: BaseInfo;\n}\n\nexport interface SendMessageResp {\n ret?: number;\n errmsg?: string;\n}\n\n// ---------------------------------------------------------------------------\n// getUploadUrl\n// ---------------------------------------------------------------------------\n\nexport interface GetUploadUrlReq {\n filekey?: string;\n /** See UploadMediaType: 1=IMAGE, 2=VIDEO, 3=FILE, 4=VOICE */\n media_type?: number;\n to_user_id?: string;\n /** Original file plaintext size. */\n rawsize?: number;\n /** Original file plaintext MD5 (hex). */\n rawfilemd5?: string;\n /** Ciphertext size after AES-128-ECB encryption. */\n filesize?: number;\n /** Thumbnail plaintext size (IMAGE/VIDEO). */\n thumb_rawsize?: number;\n /** Thumbnail plaintext MD5 (IMAGE/VIDEO). */\n thumb_rawfilemd5?: string;\n /** Thumbnail ciphertext size (IMAGE/VIDEO). */\n thumb_filesize?: number;\n /** Skip thumbnail upload URL. */\n no_need_thumb?: boolean;\n /** AES key (hex). */\n aeskey?: string;\n base_info?: BaseInfo;\n}\n\nexport interface GetUploadUrlResp {\n /** Original image upload encrypted parameters. */\n upload_param?: string;\n /** Thumbnail upload encrypted parameters. */\n thumb_upload_param?: string;\n}\n\n// ---------------------------------------------------------------------------\n// getConfig\n// ---------------------------------------------------------------------------\n\nexport interface GetConfigReq {\n ilink_user_id?: string;\n context_token?: string;\n base_info?: BaseInfo;\n}\n\nexport interface GetConfigResp {\n ret?: number;\n errmsg?: string;\n /** Base64-encoded typing ticket for sendTyping. */\n typing_ticket?: string;\n}\n\n// ---------------------------------------------------------------------------\n// sendTyping\n// ---------------------------------------------------------------------------\n\nexport interface SendTypingReq {\n ilink_user_id?: string;\n typing_ticket?: string;\n /** 1 = typing, 2 = cancel typing */\n status?: number;\n base_info?: BaseInfo;\n}\n\nexport interface SendTypingResp {\n ret?: number;\n errmsg?: string;\n}\n\n// ---------------------------------------------------------------------------\n// QR code login\n// ---------------------------------------------------------------------------\n\nexport interface QRCodeResponse {\n /** Opaque QR code identifier (pass to get_qrcode_status). */\n qrcode: string;\n /** URL that renders/encodes the QR image. */\n qrcode_img_content: string;\n}\n\nexport interface QRCodeStatusResponse {\n status: \"wait\" | \"scaned\" | \"confirmed\" | \"expired\";\n bot_token?: string;\n /** Bot account identifier (e.g. \"hex@im.bot\"). */\n ilink_bot_id?: string;\n /** API base URL returned on successful login. */\n baseurl?: string;\n /** User ID of the person who scanned the QR code. */\n ilink_user_id?: string;\n}\n","/**\n * QR code login flow for the WeChat iLink bot protocol.\n *\n * Flow:\n * 1. GET ilink/bot/get_bot_qrcode?bot_type=3 -> { qrcode, qrcode_img_content }\n * 2. Caller renders the QR code (library only returns the URL)\n * 3. Long-poll GET ilink/bot/get_qrcode_status?qrcode=... until \"confirmed\"\n * 4. Extract bot_token, ilink_bot_id, baseurl, ilink_user_id\n */\nimport type { ApiClient } from \"../api/client.js\";\nimport type { QRCodeStatusResponse } from \"../api/types.js\";\n\n// ---------------------------------------------------------------------------\n// Types\n// ---------------------------------------------------------------------------\n\nexport interface LoginResult {\n connected: boolean;\n botToken?: string;\n accountId?: string;\n baseUrl?: string;\n userId?: string;\n message: string;\n}\n\nexport interface QRLoginOptions {\n /** Maximum time to wait for QR scan (ms). Default: 480_000 (8 min). */\n timeoutMs?: number;\n /** bot_type parameter (default: \"3\"). */\n botType?: string;\n /** Maximum number of QR code refreshes on expiry. Default: 3. */\n maxRefreshes?: number;\n /**\n * Called when a QR code URL is available (initial and on refresh).\n * The caller is responsible for rendering the QR code.\n */\n onQRCode?: (qrcodeUrl: string) => void | Promise;\n /** Called when status changes. */\n onStatus?: (status: QRCodeStatusResponse[\"status\"]) => void;\n /** AbortSignal for cancellation. */\n signal?: AbortSignal;\n}\n\n// ---------------------------------------------------------------------------\n// Login implementation\n// ---------------------------------------------------------------------------\n\n/**\n * Run the full QR code login flow. Returns a LoginResult.\n *\n * The library does NOT render QR codes — use `opts.onQRCode` to receive\n * the QR code URL and handle display yourself.\n */\nexport async function loginWithQRCode(\n api: ApiClient,\n opts: QRLoginOptions = {},\n): Promise {\n const timeoutMs = Math.max(opts.timeoutMs ?? 480_000, 1000);\n const maxRefreshes = opts.maxRefreshes ?? 3;\n const deadline = Date.now() + timeoutMs;\n let refreshCount = 1;\n\n // Step 1: fetch initial QR code\n const qrResponse = await api.getQRCode(opts.botType);\n let qrcode = qrResponse.qrcode;\n\n // Notify caller with QR code URL\n if (opts.onQRCode) {\n await opts.onQRCode(qrResponse.qrcode_img_content);\n }\n\n // Step 2: poll until confirmed, expired (refresh), or timeout\n while (Date.now() < deadline) {\n if (opts.signal?.aborted) {\n return { connected: false, message: \"Login cancelled.\" };\n }\n\n const status = await api.pollQRCodeStatus(qrcode);\n opts.onStatus?.(status.status);\n\n switch (status.status) {\n case \"wait\":\n break;\n\n case \"scaned\":\n break;\n\n case \"expired\": {\n refreshCount++;\n if (refreshCount > maxRefreshes) {\n return {\n connected: false,\n message: `QR code expired ${maxRefreshes} times. Please restart login.`,\n };\n }\n // Fetch a new QR code\n const refreshed = await api.getQRCode(opts.botType);\n qrcode = refreshed.qrcode;\n if (opts.onQRCode) {\n await opts.onQRCode(refreshed.qrcode_img_content);\n }\n break;\n }\n\n case \"confirmed\": {\n if (!status.ilink_bot_id) {\n return {\n connected: false,\n message:\n \"Login confirmed but server did not return ilink_bot_id.\",\n };\n }\n return {\n connected: true,\n botToken: status.bot_token,\n accountId: status.ilink_bot_id,\n baseUrl: status.baseurl,\n userId: status.ilink_user_id,\n message: \"Login successful!\",\n };\n }\n }\n\n // Brief pause between polls\n await new Promise((r) => setTimeout(r, 1000));\n }\n\n return { connected: false, message: \"Login timed out.\" };\n}\n","/**\n * AES-128-ECB crypto utilities used by the WeChat CDN for media upload/download.\n *\n * All media files are encrypted with AES-128-ECB (PKCS7 padding) before upload,\n * and must be decrypted after download.\n */\nimport { createCipheriv, createDecipheriv } from \"node:crypto\";\n\n/** Encrypt a buffer with AES-128-ECB (PKCS7 padding). */\nexport function encryptAesEcb(plaintext: Buffer, key: Buffer): Buffer {\n const cipher = createCipheriv(\"aes-128-ecb\", key, null);\n return Buffer.concat([cipher.update(plaintext), cipher.final()]);\n}\n\n/** Decrypt a buffer with AES-128-ECB (PKCS7 padding). */\nexport function decryptAesEcb(ciphertext: Buffer, key: Buffer): Buffer {\n const decipher = createDecipheriv(\"aes-128-ecb\", key, null);\n return Buffer.concat([decipher.update(ciphertext), decipher.final()]);\n}\n\n/** Compute AES-128-ECB ciphertext size (PKCS7 pads to 16-byte boundary). */\nexport function aesEcbPaddedSize(plaintextSize: number): number {\n return Math.ceil((plaintextSize + 1) / 16) * 16;\n}\n","/**\n * CDN URL construction for WeChat CDN upload/download.\n */\n\n/** Build a CDN download URL from encrypt_query_param. */\nexport function buildCdnDownloadUrl(\n encryptedQueryParam: string,\n cdnBaseUrl: string,\n): string {\n return `${cdnBaseUrl}/download?encrypted_query_param=${encodeURIComponent(encryptedQueryParam)}`;\n}\n\n/** Build a CDN upload URL from upload_param and filekey. */\nexport function buildCdnUploadUrl(params: {\n cdnBaseUrl: string;\n uploadParam: string;\n filekey: string;\n}): string {\n return `${params.cdnBaseUrl}/upload?encrypted_query_param=${encodeURIComponent(params.uploadParam)}&filekey=${encodeURIComponent(params.filekey)}`;\n}\n","/**\n * Download and optionally decrypt media from the WeChat CDN.\n */\nimport { decryptAesEcb } from \"./aes-ecb.js\";\nimport { buildCdnDownloadUrl } from \"./cdn-url.js\";\n\n/**\n * Download raw bytes from the CDN (no decryption).\n */\nasync function fetchCdnBytes(url: string): Promise {\n const res = await fetch(url);\n if (!res.ok) {\n const body = await res.text().catch(() => \"(unreadable)\");\n throw new Error(`CDN download ${res.status} ${res.statusText}: ${body}`);\n }\n return Buffer.from(await res.arrayBuffer());\n}\n\n/**\n * Parse CDNMedia.aes_key into a raw 16-byte AES key.\n *\n * Two encodings are observed:\n * - base64(raw 16 bytes) -> images (aes_key from media field)\n * - base64(hex string of 16 bytes) -> file / voice / video\n *\n * In the second case, base64-decoding yields 32 ASCII hex chars which must\n * then be parsed as hex to recover the actual 16-byte key.\n */\nexport function parseAesKey(aesKeyBase64: string): Buffer {\n const decoded = Buffer.from(aesKeyBase64, \"base64\");\n if (decoded.length === 16) {\n return decoded;\n }\n if (\n decoded.length === 32 &&\n /^[0-9a-fA-F]{32}$/.test(decoded.toString(\"ascii\"))\n ) {\n return Buffer.from(decoded.toString(\"ascii\"), \"hex\");\n }\n throw new Error(\n `aes_key must decode to 16 raw bytes or 32-char hex string, got ${decoded.length} bytes`,\n );\n}\n\n/**\n * Download and AES-128-ECB decrypt a CDN media file. Returns plaintext Buffer.\n */\nexport async function downloadAndDecrypt(\n encryptedQueryParam: string,\n aesKeyBase64: string,\n cdnBaseUrl: string,\n): Promise {\n const key = parseAesKey(aesKeyBase64);\n const url = buildCdnDownloadUrl(encryptedQueryParam, cdnBaseUrl);\n const encrypted = await fetchCdnBytes(url);\n return decryptAesEcb(encrypted, key);\n}\n\n/**\n * Download plain (unencrypted) bytes from the CDN.\n */\nexport async function downloadPlain(\n encryptedQueryParam: string,\n cdnBaseUrl: string,\n): Promise {\n const url = buildCdnDownloadUrl(encryptedQueryParam, cdnBaseUrl);\n return fetchCdnBytes(url);\n}\n","/**\n * High-level media download from inbound messages.\n *\n * Downloads and decrypts CDN media referenced in MessageItem fields.\n */\nimport type { MessageItem } from \"../api/types.js\";\nimport { MessageItemType } from \"../api/types.js\";\nimport {\n downloadAndDecrypt,\n downloadPlain,\n} from \"../cdn/cdn-download.js\";\n\n// ---------------------------------------------------------------------------\n// Types\n// ---------------------------------------------------------------------------\n\nexport interface DownloadedMedia {\n /** Decrypted file content. */\n data: Buffer;\n /** Media type hint: \"image\", \"voice\", \"file\", \"video\". */\n kind: \"image\" | \"voice\" | \"file\" | \"video\";\n /** Original filename (file items only). */\n fileName?: string;\n}\n\n// ---------------------------------------------------------------------------\n// Public API\n// ---------------------------------------------------------------------------\n\n/**\n * Download and decrypt media from a single MessageItem.\n * Returns null if the item has no downloadable media.\n */\nexport async function downloadMediaFromItem(\n item: MessageItem,\n cdnBaseUrl: string,\n): Promise {\n if (item.type === MessageItemType.IMAGE) {\n const img = item.image_item;\n if (!img?.media?.encrypt_query_param) return null;\n // Prefer hex aeskey from image_item, fall back to media.aes_key\n const aesKeyBase64 = img.aeskey\n ? Buffer.from(img.aeskey, \"hex\").toString(\"base64\")\n : img.media.aes_key;\n\n const data = aesKeyBase64\n ? await downloadAndDecrypt(\n img.media.encrypt_query_param,\n aesKeyBase64,\n cdnBaseUrl,\n )\n : await downloadPlain(\n img.media.encrypt_query_param,\n cdnBaseUrl,\n );\n return { data, kind: \"image\" };\n }\n\n if (item.type === MessageItemType.VOICE) {\n const voice = item.voice_item;\n if (\n !voice?.media?.encrypt_query_param ||\n !voice.media.aes_key\n )\n return null;\n const data = await downloadAndDecrypt(\n voice.media.encrypt_query_param,\n voice.media.aes_key,\n cdnBaseUrl,\n );\n return { data, kind: \"voice\" };\n }\n\n if (item.type === MessageItemType.FILE) {\n const fileItem = item.file_item;\n if (\n !fileItem?.media?.encrypt_query_param ||\n !fileItem.media.aes_key\n )\n return null;\n const data = await downloadAndDecrypt(\n fileItem.media.encrypt_query_param,\n fileItem.media.aes_key,\n cdnBaseUrl,\n );\n return {\n data,\n kind: \"file\",\n fileName: fileItem.file_name ?? undefined,\n };\n }\n\n if (item.type === MessageItemType.VIDEO) {\n const videoItem = item.video_item;\n if (\n !videoItem?.media?.encrypt_query_param ||\n !videoItem.media.aes_key\n )\n return null;\n const data = await downloadAndDecrypt(\n videoItem.media.encrypt_query_param,\n videoItem.media.aes_key,\n cdnBaseUrl,\n );\n return { data, kind: \"video\" };\n }\n\n return null;\n}\n","import path from \"node:path\";\n\nconst EXTENSION_TO_MIME: Record = {\n \".pdf\": \"application/pdf\",\n \".doc\": \"application/msword\",\n \".docx\": \"application/vnd.openxmlformats-officedocument.wordprocessingml.document\",\n \".xls\": \"application/vnd.ms-excel\",\n \".xlsx\": \"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet\",\n \".ppt\": \"application/vnd.ms-powerpoint\",\n \".pptx\": \"application/vnd.openxmlformats-officedocument.presentationml.presentation\",\n \".txt\": \"text/plain\",\n \".csv\": \"text/csv\",\n \".zip\": \"application/zip\",\n \".tar\": \"application/x-tar\",\n \".gz\": \"application/gzip\",\n \".mp3\": \"audio/mpeg\",\n \".ogg\": \"audio/ogg\",\n \".wav\": \"audio/wav\",\n \".mp4\": \"video/mp4\",\n \".mov\": \"video/quicktime\",\n \".webm\": \"video/webm\",\n \".mkv\": \"video/x-matroska\",\n \".avi\": \"video/x-msvideo\",\n \".png\": \"image/png\",\n \".jpg\": \"image/jpeg\",\n \".jpeg\": \"image/jpeg\",\n \".gif\": \"image/gif\",\n \".webp\": \"image/webp\",\n \".bmp\": \"image/bmp\",\n};\n\nconst MIME_TO_EXTENSION: Record = {\n \"image/jpeg\": \".jpg\",\n \"image/jpg\": \".jpg\",\n \"image/png\": \".png\",\n \"image/gif\": \".gif\",\n \"image/webp\": \".webp\",\n \"image/bmp\": \".bmp\",\n \"video/mp4\": \".mp4\",\n \"video/quicktime\": \".mov\",\n \"video/webm\": \".webm\",\n \"video/x-matroska\": \".mkv\",\n \"video/x-msvideo\": \".avi\",\n \"audio/mpeg\": \".mp3\",\n \"audio/ogg\": \".ogg\",\n \"audio/wav\": \".wav\",\n \"application/pdf\": \".pdf\",\n \"application/zip\": \".zip\",\n \"application/x-tar\": \".tar\",\n \"application/gzip\": \".gz\",\n \"text/plain\": \".txt\",\n \"text/csv\": \".csv\",\n};\n\n/** Get MIME type from filename extension. Defaults to \"application/octet-stream\". */\nexport function getMimeFromFilename(filename: string): string {\n const ext = path.extname(filename).toLowerCase();\n return EXTENSION_TO_MIME[ext] ?? \"application/octet-stream\";\n}\n\n/** Get file extension from MIME type. Defaults to \".bin\". */\nexport function getExtensionFromMime(mimeType: string): string {\n const ct = mimeType.split(\";\")[0].trim().toLowerCase();\n return MIME_TO_EXTENSION[ct] ?? \".bin\";\n}\n\n/** Get file extension from Content-Type header or URL path. Defaults to \".bin\". */\nexport function getExtensionFromContentTypeOrUrl(\n contentType: string | null,\n url: string,\n): string {\n if (contentType) {\n const ext = getExtensionFromMime(contentType);\n if (ext !== \".bin\") return ext;\n }\n const ext = path.extname(new URL(url).pathname).toLowerCase();\n const knownExts = new Set(Object.keys(EXTENSION_TO_MIME));\n return knownExts.has(ext) ? ext : \".bin\";\n}\n","/**\n * Upload encrypted media to the WeChat CDN.\n */\nimport { encryptAesEcb } from \"./aes-ecb.js\";\nimport { buildCdnUploadUrl } from \"./cdn-url.js\";\n\nconst UPLOAD_MAX_RETRIES = 3;\n\n/**\n * Upload one buffer to the WeChat CDN with AES-128-ECB encryption.\n * Returns the download encrypted_query_param from the CDN `x-encrypted-param` header.\n */\nexport async function uploadBufferToCdn(params: {\n buf: Buffer;\n uploadParam: string;\n filekey: string;\n cdnBaseUrl: string;\n aeskey: Buffer;\n}): Promise<{ downloadParam: string }> {\n const { buf, uploadParam, filekey, cdnBaseUrl, aeskey } = params;\n const ciphertext = encryptAesEcb(buf, aeskey);\n const cdnUrl = buildCdnUploadUrl({ cdnBaseUrl, uploadParam, filekey });\n\n let downloadParam: string | undefined;\n let lastError: unknown;\n\n for (let attempt = 1; attempt <= UPLOAD_MAX_RETRIES; attempt++) {\n try {\n const res = await fetch(cdnUrl, {\n method: \"POST\",\n headers: { \"Content-Type\": \"application/octet-stream\" },\n body: new Uint8Array(ciphertext),\n });\n\n if (res.status >= 400 && res.status < 500) {\n const errMsg =\n res.headers.get(\"x-error-message\") ?? (await res.text());\n throw new Error(`CDN upload client error ${res.status}: ${errMsg}`);\n }\n if (res.status !== 200) {\n const errMsg =\n res.headers.get(\"x-error-message\") ?? `status ${res.status}`;\n throw new Error(`CDN upload server error: ${errMsg}`);\n }\n\n downloadParam = res.headers.get(\"x-encrypted-param\") ?? undefined;\n if (!downloadParam) {\n throw new Error(\n \"CDN upload response missing x-encrypted-param header\",\n );\n }\n break;\n } catch (err) {\n lastError = err;\n if (\n err instanceof Error &&\n err.message.includes(\"client error\")\n ) {\n throw err;\n }\n if (attempt >= UPLOAD_MAX_RETRIES) {\n break;\n }\n }\n }\n\n if (!downloadParam) {\n throw lastError instanceof Error\n ? lastError\n : new Error(\n `CDN upload failed after ${UPLOAD_MAX_RETRIES} attempts`,\n );\n }\n return { downloadParam };\n}\n","/**\n * High-level media upload pipeline for the WeChat CDN.\n *\n * Flow:\n * 1. Read file -> compute MD5, plaintext size, ciphertext size\n * 2. Generate random 16-byte AES key and filekey\n * 3. Call getUploadUrl to get upload_param\n * 4. Encrypt with AES-128-ECB and POST to CDN\n * 5. Return uploaded file info (download param, key, sizes)\n */\nimport crypto from \"node:crypto\";\nimport fs from \"node:fs/promises\";\n\nimport type { ApiClient } from \"../api/client.js\";\nimport { UploadMediaType } from \"../api/types.js\";\nimport { aesEcbPaddedSize } from \"../cdn/aes-ecb.js\";\nimport { uploadBufferToCdn } from \"../cdn/cdn-upload.js\";\n\n// ---------------------------------------------------------------------------\n// Types\n// ---------------------------------------------------------------------------\n\nexport interface UploadedFileInfo {\n filekey: string;\n /** CDN download encrypted_query_param (fill into CDNMedia.encrypt_query_param). */\n downloadEncryptedQueryParam: string;\n /** AES-128-ECB key, hex-encoded; convert to base64 for CDNMedia.aes_key. */\n aeskey: string;\n /** Plaintext file size in bytes. */\n fileSize: number;\n /** Ciphertext file size in bytes (after AES-128-ECB + PKCS7). */\n fileSizeCiphertext: number;\n}\n\n// ---------------------------------------------------------------------------\n// Internal helper\n// ---------------------------------------------------------------------------\n\nasync function uploadMedia(params: {\n filePath: string;\n toUserId: string;\n api: ApiClient;\n cdnBaseUrl: string;\n mediaType: (typeof UploadMediaType)[keyof typeof UploadMediaType];\n}): Promise {\n const { filePath, toUserId, api, cdnBaseUrl, mediaType } = params;\n\n const plaintext = await fs.readFile(filePath);\n const rawsize = plaintext.length;\n const rawfilemd5 = crypto\n .createHash(\"md5\")\n .update(plaintext)\n .digest(\"hex\");\n const filesize = aesEcbPaddedSize(rawsize);\n const filekey = crypto.randomBytes(16).toString(\"hex\");\n const aeskey = crypto.randomBytes(16);\n\n const uploadUrlResp = await api.getUploadUrl({\n filekey,\n media_type: mediaType,\n to_user_id: toUserId,\n rawsize,\n rawfilemd5,\n filesize,\n no_need_thumb: true,\n aeskey: aeskey.toString(\"hex\"),\n });\n\n const uploadParam = uploadUrlResp.upload_param;\n if (!uploadParam) {\n throw new Error(\n `getUploadUrl returned no upload_param: ${JSON.stringify(uploadUrlResp)}`,\n );\n }\n\n const { downloadParam } = await uploadBufferToCdn({\n buf: plaintext,\n uploadParam,\n filekey,\n cdnBaseUrl,\n aeskey,\n });\n\n return {\n filekey,\n downloadEncryptedQueryParam: downloadParam,\n aeskey: aeskey.toString(\"hex\"),\n fileSize: rawsize,\n fileSizeCiphertext: filesize,\n };\n}\n\n// ---------------------------------------------------------------------------\n// Public API\n// ---------------------------------------------------------------------------\n\n/** Upload a local image file to the WeChat CDN. */\nexport async function uploadImage(params: {\n filePath: string;\n toUserId: string;\n api: ApiClient;\n cdnBaseUrl: string;\n}): Promise {\n return uploadMedia({ ...params, mediaType: UploadMediaType.IMAGE });\n}\n\n/** Upload a local video file to the WeChat CDN. */\nexport async function uploadVideo(params: {\n filePath: string;\n toUserId: string;\n api: ApiClient;\n cdnBaseUrl: string;\n}): Promise {\n return uploadMedia({ ...params, mediaType: UploadMediaType.VIDEO });\n}\n\n/** Upload a local file attachment to the WeChat CDN. */\nexport async function uploadFile(params: {\n filePath: string;\n toUserId: string;\n api: ApiClient;\n cdnBaseUrl: string;\n}): Promise {\n return uploadMedia({ ...params, mediaType: UploadMediaType.FILE });\n}\n","import crypto from \"node:crypto\";\n\n/**\n * Generate a prefixed unique ID: `{prefix}:{timestamp}-{8-char hex}`.\n */\nexport function generateId(prefix: string): string {\n return `${prefix}:${Date.now()}-${crypto.randomBytes(4).toString(\"hex\")}`;\n}\n\n/**\n * Generate a temporary file name: `{prefix}-{timestamp}-{8-char hex}{ext}`.\n */\nexport function tempFileName(prefix: string, ext: string): string {\n return `${prefix}-${Date.now()}-${crypto.randomBytes(4).toString(\"hex\")}${ext}`;\n}\n","/**\n * High-level message sending helpers.\n *\n * Builds SendMessageReq payloads for text, image, video, and file messages,\n * and dispatches them through the ApiClient.\n */\nimport path from \"node:path\";\n\nimport type { ApiClient } from \"../api/client.js\";\nimport type {\n MessageItem,\n SendMessageReq,\n} from \"../api/types.js\";\nimport {\n MessageItemType,\n MessageState,\n MessageType,\n} from \"../api/types.js\";\nimport { getMimeFromFilename } from \"../util/mime.js\";\nimport type { UploadedFileInfo } from \"./upload.js\";\nimport { uploadImage, uploadVideo, uploadFile } from \"./upload.js\";\nimport { generateId } from \"../util/random.js\";\n\n// ---------------------------------------------------------------------------\n// Helpers\n// ---------------------------------------------------------------------------\n\nfunction generateClientId(): string {\n return generateId(\"wechat-ilink\");\n}\n\nfunction buildReq(params: {\n to: string;\n contextToken?: string;\n items: MessageItem[];\n}): SendMessageReq {\n return {\n msg: {\n from_user_id: \"\",\n to_user_id: params.to,\n client_id: generateClientId(),\n message_type: MessageType.BOT,\n message_state: MessageState.FINISH,\n item_list: params.items.length ? params.items : undefined,\n context_token: params.contextToken ?? undefined,\n },\n };\n}\n\n// ---------------------------------------------------------------------------\n// Public send helpers\n// ---------------------------------------------------------------------------\n\n/**\n * Send a text message. contextToken is required (echoed from getUpdates).\n */\nexport async function sendText(\n api: ApiClient,\n to: string,\n text: string,\n contextToken: string,\n): Promise {\n const clientId = generateClientId();\n const req: SendMessageReq = {\n msg: {\n from_user_id: \"\",\n to_user_id: to,\n client_id: clientId,\n message_type: MessageType.BOT,\n message_state: MessageState.FINISH,\n item_list: text\n ? [{ type: MessageItemType.TEXT, text_item: { text } }]\n : undefined,\n context_token: contextToken,\n },\n };\n await api.sendMessage(req);\n return clientId;\n}\n\n/**\n * Send an image message with a previously uploaded file.\n */\nexport async function sendImage(\n api: ApiClient,\n to: string,\n uploaded: UploadedFileInfo,\n contextToken: string,\n caption?: string,\n): Promise {\n const items: MessageItem[] = [];\n if (caption) {\n items.push({\n type: MessageItemType.TEXT,\n text_item: { text: caption },\n });\n }\n items.push({\n type: MessageItemType.IMAGE,\n image_item: {\n media: {\n encrypt_query_param: uploaded.downloadEncryptedQueryParam,\n aes_key: Buffer.from(uploaded.aeskey).toString(\"base64\"),\n encrypt_type: 1,\n },\n mid_size: uploaded.fileSizeCiphertext,\n },\n });\n\n // Send each item as its own request (text first, then image)\n let lastClientId = \"\";\n for (const item of items) {\n const req = buildReq({ to, contextToken, items: [item] });\n lastClientId = req.msg?.client_id ?? lastClientId;\n await api.sendMessage(req);\n }\n return lastClientId;\n}\n\n/**\n * Send a video message with a previously uploaded file.\n */\nexport async function sendVideo(\n api: ApiClient,\n to: string,\n uploaded: UploadedFileInfo,\n contextToken: string,\n caption?: string,\n): Promise {\n const items: MessageItem[] = [];\n if (caption) {\n items.push({\n type: MessageItemType.TEXT,\n text_item: { text: caption },\n });\n }\n items.push({\n type: MessageItemType.VIDEO,\n video_item: {\n media: {\n encrypt_query_param: uploaded.downloadEncryptedQueryParam,\n aes_key: Buffer.from(uploaded.aeskey).toString(\"base64\"),\n encrypt_type: 1,\n },\n video_size: uploaded.fileSizeCiphertext,\n },\n });\n\n let lastClientId = \"\";\n for (const item of items) {\n const req = buildReq({ to, contextToken, items: [item] });\n lastClientId = req.msg?.client_id ?? lastClientId;\n await api.sendMessage(req);\n }\n return lastClientId;\n}\n\n/**\n * Send a file attachment with a previously uploaded file.\n */\nexport async function sendFileMessage(\n api: ApiClient,\n to: string,\n fileName: string,\n uploaded: UploadedFileInfo,\n contextToken: string,\n caption?: string,\n): Promise {\n const items: MessageItem[] = [];\n if (caption) {\n items.push({\n type: MessageItemType.TEXT,\n text_item: { text: caption },\n });\n }\n items.push({\n type: MessageItemType.FILE,\n file_item: {\n media: {\n encrypt_query_param: uploaded.downloadEncryptedQueryParam,\n aes_key: Buffer.from(uploaded.aeskey).toString(\"base64\"),\n encrypt_type: 1,\n },\n file_name: fileName,\n len: String(uploaded.fileSize),\n },\n });\n\n let lastClientId = \"\";\n for (const item of items) {\n const req = buildReq({ to, contextToken, items: [item] });\n lastClientId = req.msg?.client_id ?? lastClientId;\n await api.sendMessage(req);\n }\n return lastClientId;\n}\n\n/**\n * Upload and send a local file as a media message. Routing by MIME type:\n * - video/* -> video message\n * - image/* -> image message\n * - else -> file attachment\n */\nexport async function sendMediaFile(\n api: ApiClient,\n to: string,\n filePath: string,\n contextToken: string,\n caption?: string,\n): Promise {\n const mime = getMimeFromFilename(filePath);\n const cdnBaseUrl = api.cdnBaseUrl;\n\n if (mime.startsWith(\"video/\")) {\n const uploaded = await uploadVideo({\n filePath,\n toUserId: to,\n api,\n cdnBaseUrl,\n });\n return sendVideo(api, to, uploaded, contextToken, caption);\n }\n\n if (mime.startsWith(\"image/\")) {\n const uploaded = await uploadImage({\n filePath,\n toUserId: to,\n api,\n cdnBaseUrl,\n });\n return sendImage(api, to, uploaded, contextToken, caption);\n }\n\n // File attachment\n const fileName = path.basename(filePath);\n const uploaded = await uploadFile({\n filePath,\n toUserId: to,\n api,\n cdnBaseUrl,\n });\n return sendFileMessage(\n api,\n to,\n fileName,\n uploaded,\n contextToken,\n caption,\n );\n}\n","/**\n * Long-poll monitor loop.\n *\n * Continuously calls getUpdates and emits inbound messages via a callback.\n * Handles error backoff and session expiry.\n *\n * Sync buf (cursor) persistence is fully controlled by the caller via\n * optional `loadSyncBuf` / `saveSyncBuf` callbacks in MonitorOptions.\n */\nimport type { ApiClient } from \"./api/client.js\";\nimport type { WeixinMessage, GetUpdatesResp } from \"./api/types.js\";\n\n// ---------------------------------------------------------------------------\n// Constants\n// ---------------------------------------------------------------------------\n\nconst DEFAULT_LONG_POLL_TIMEOUT_MS = 35_000;\nconst MAX_CONSECUTIVE_FAILURES = 3;\nconst BACKOFF_DELAY_MS = 30_000;\nconst RETRY_DELAY_MS = 2_000;\n\n/** Error code returned by the server when the bot session has expired. */\nexport const SESSION_EXPIRED_ERRCODE = -14;\n\n// ---------------------------------------------------------------------------\n// Types\n// ---------------------------------------------------------------------------\n\nexport interface MonitorOptions {\n /** Long-poll timeout in ms. Server may override via longpolling_timeout_ms. */\n longPollTimeoutMs?: number;\n /** AbortSignal for stopping the loop. */\n signal?: AbortSignal;\n /**\n * Called once at startup to load a previously persisted sync cursor.\n * Return the cursor string, or undefined/empty to start fresh.\n */\n loadSyncBuf?: () => string | undefined | Promise;\n /**\n * Called after each successful getUpdates with the new cursor value.\n * The caller can persist this for resume across restarts.\n */\n saveSyncBuf?: (buf: string) => void | Promise;\n}\n\nexport interface MonitorCallbacks {\n /** Called for each inbound message. */\n onMessage: (msg: WeixinMessage) => void | Promise;\n /** Called when getUpdates returns an error response. */\n onError?: (err: Error) => void;\n /** Called when the bot session has expired (errcode -14). */\n onSessionExpired?: () => void;\n /** Called after each successful getUpdates response. */\n onPoll?: (resp: GetUpdatesResp) => void;\n}\n\n// ---------------------------------------------------------------------------\n// Implementation\n// ---------------------------------------------------------------------------\n\nfunction sleep(ms: number, signal?: AbortSignal): Promise {\n return new Promise((resolve, reject) => {\n const t = setTimeout(resolve, ms);\n signal?.addEventListener(\n \"abort\",\n () => {\n clearTimeout(t);\n reject(new Error(\"aborted\"));\n },\n { once: true },\n );\n });\n}\n\n/**\n * Start the long-poll monitor loop. Runs until the AbortSignal fires.\n */\nexport async function startMonitor(\n api: ApiClient,\n opts: MonitorOptions,\n callbacks: MonitorCallbacks,\n): Promise {\n const { signal } = opts;\n\n // Load persisted cursor via caller-provided callback\n let getUpdatesBuf = \"\";\n if (opts.loadSyncBuf) {\n const loaded = await opts.loadSyncBuf();\n if (loaded) {\n getUpdatesBuf = loaded;\n }\n }\n\n let nextTimeoutMs =\n opts.longPollTimeoutMs ?? 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[];\n for (const msg of msgs) {\n await callbacks.onMessage(msg);\n }\n } catch (err) {\n if (signal?.aborted) return;\n consecutiveFailures++;\n callbacks.onError?.(\n err instanceof Error\n ? err\n : new Error(String(err)),\n );\n\n if (consecutiveFailures >= MAX_CONSECUTIVE_FAILURES) {\n consecutiveFailures = 0;\n await sleep(BACKOFF_DELAY_MS, signal);\n } else {\n await sleep(RETRY_DELAY_MS, signal);\n }\n }\n }\n}\n","/**\n * WeChatClient — high-level client for the WeChat iLink bot protocol.\n *\n * Wraps the low-level API, QR login, long-poll monitor, media upload/download,\n * and message sending into a single EventEmitter-based interface.\n *\n * This is a pure in-memory client. It does NOT persist any data to disk.\n * The caller is responsible for:\n * - Storing/loading the token and accountId across restarts\n * - Storing/loading the sync buf (long-poll cursor) for message resume\n * - Rendering QR codes during login\n *\n * Usage:\n * const client = new WeChatClient({ token, accountId });\n * client.on(\"message\", (msg) => { ... });\n * await client.start();\n */\nimport { EventEmitter } from \"node:events\";\n\nimport { ApiClient } from \"./api/client.js\";\nimport type { ApiClientOptions } from \"./api/client.js\";\nimport type {\n WeixinMessage,\n MessageItem,\n GetUpdatesResp,\n SendTypingReq,\n} from \"./api/types.js\";\nimport { MessageItemType, TypingStatus } from \"./api/types.js\";\nimport { loginWithQRCode } from \"./auth/qr-login.js\";\nimport type { LoginResult, QRLoginOptions } from \"./auth/qr-login.js\";\nimport { downloadMediaFromItem } from \"./media/download.js\";\nimport type { DownloadedMedia } from \"./media/download.js\";\nimport {\n sendText,\n sendImage,\n sendVideo,\n sendFileMessage,\n sendMediaFile,\n} from \"./media/send.js\";\nimport type { UploadedFileInfo } from \"./media/upload.js\";\nimport {\n uploadImage,\n uploadVideo,\n uploadFile,\n} from \"./media/upload.js\";\nimport { startMonitor } from \"./monitor.js\";\nimport type { MonitorOptions, MonitorCallbacks } from \"./monitor.js\";\n\n// ---------------------------------------------------------------------------\n// Types\n// ---------------------------------------------------------------------------\n\nexport interface WeChatClientOptions extends ApiClientOptions {\n /** Account ID. Set after login if not provided. */\n accountId?: string;\n}\n\nexport interface WeChatClientEvents {\n message: [msg: WeixinMessage];\n error: [err: Error];\n sessionExpired: [];\n poll: [resp: GetUpdatesResp];\n}\n\n// ---------------------------------------------------------------------------\n// Helpers\n// ---------------------------------------------------------------------------\n\n/** Extract text body from a message's item_list. */\nfunction extractTextBody(itemList?: MessageItem[]): string {\n if (!itemList?.length) return \"\";\n for (const item of itemList) {\n if (\n item.type === MessageItemType.TEXT &&\n item.text_item?.text != null\n ) {\n return String(item.text_item.text);\n }\n // Voice-to-text\n if (\n item.type === MessageItemType.VOICE &&\n item.voice_item?.text\n ) {\n return item.voice_item.text;\n }\n }\n return \"\";\n}\n\n/**\n * Normalize a raw account ID (e.g. \"hex@im.bot\") to a safe key\n * (e.g. \"hex-im-bot\").\n */\nexport function normalizeAccountId(raw: string): string {\n return raw.trim().toLowerCase().replace(/[@.]/g, \"-\");\n}\n\n// ---------------------------------------------------------------------------\n// Client\n// ---------------------------------------------------------------------------\n\nexport class WeChatClient extends EventEmitter {\n readonly api: ApiClient;\n private accountId?: string;\n private abortController?: AbortController;\n\n /** In-process cache: userId -> contextToken (echoed from getUpdates). */\n private contextTokens = new Map();\n\n constructor(opts: WeChatClientOptions = {}) {\n super();\n this.api = new ApiClient(opts);\n this.accountId = opts.accountId;\n }\n\n // -----------------------------------------------------------------------\n // Getters / setters\n // -----------------------------------------------------------------------\n\n getAccountId(): string | undefined {\n return this.accountId;\n }\n\n /** Get the cached context token for a user (needed for sending replies). */\n getContextToken(userId: string): string | undefined {\n return this.contextTokens.get(userId);\n }\n\n // -----------------------------------------------------------------------\n // QR login\n // -----------------------------------------------------------------------\n\n /**\n * Run the QR code login flow. On success, configures the API client\n * with the new token and sets the accountId.\n *\n * The library does NOT render QR codes. Use `opts.onQRCode` to receive\n * the QR code URL and handle display yourself.\n *\n * The library does NOT persist credentials. The caller should save\n * `result.botToken`, `result.accountId`, and `result.baseUrl` themselves.\n */\n async login(opts: QRLoginOptions = {}): Promise {\n const result = await loginWithQRCode(this.api, opts);\n\n if (result.connected && result.botToken && result.accountId) {\n this.accountId = normalizeAccountId(result.accountId);\n this.api.setToken(result.botToken);\n }\n\n return result;\n }\n\n // -----------------------------------------------------------------------\n // Long-poll monitor\n // -----------------------------------------------------------------------\n\n /**\n * Start the long-poll monitor loop. Emits \"message\" events for each\n * inbound message.\n *\n * Sync buf persistence is opt-in via `opts.loadSyncBuf` / `opts.saveSyncBuf`.\n *\n * Call `stop()` to terminate.\n */\n async start(opts: Omit = {}): Promise {\n if (!this.accountId) {\n throw new Error(\n \"No accountId set. Call login() first or pass accountId in constructor.\",\n );\n }\n if (!this.api.getToken()) {\n throw new Error(\n \"No token set. 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Uses the cached context token for the target user.\n * Pass an explicit contextToken to override.\n */\n async sendText(\n to: string,\n text: string,\n contextToken?: string,\n ): Promise {\n const ct =\n contextToken ?? this.contextTokens.get(to);\n if (!ct) {\n throw new Error(\n `No context_token for user ${to}. Receive a message from them first.`,\n );\n }\n return sendText(this.api, to, text, ct);\n }\n\n /**\n * Upload a local file and send it as the appropriate media type.\n * (image/*, video/*, or file attachment based on MIME type.)\n */\n async sendMedia(\n to: string,\n filePath: string,\n caption?: string,\n contextToken?: string,\n ): Promise {\n const ct =\n contextToken ?? this.contextTokens.get(to);\n if (!ct) {\n throw new Error(\n `No context_token for user ${to}. Receive a message from them first.`,\n );\n }\n return sendMediaFile(this.api, to, filePath, ct, caption);\n }\n\n /**\n * Send an already-uploaded image.\n */\n async sendUploadedImage(\n to: string,\n uploaded: UploadedFileInfo,\n caption?: string,\n contextToken?: string,\n ): Promise {\n const ct =\n contextToken ?? this.contextTokens.get(to);\n if (!ct) {\n throw new Error(\n `No context_token for user ${to}.`,\n );\n }\n return sendImage(this.api, to, uploaded, ct, caption);\n }\n\n /**\n * Send an already-uploaded video.\n */\n async sendUploadedVideo(\n to: string,\n uploaded: UploadedFileInfo,\n caption?: string,\n contextToken?: string,\n ): Promise {\n const ct =\n contextToken ?? this.contextTokens.get(to);\n if (!ct) {\n throw new Error(\n `No context_token for user ${to}.`,\n );\n }\n return sendVideo(this.api, to, uploaded, ct, caption);\n }\n\n /**\n * Send an already-uploaded file attachment.\n */\n async sendUploadedFile(\n to: string,\n fileName: string,\n uploaded: UploadedFileInfo,\n caption?: string,\n contextToken?: string,\n ): Promise {\n const ct =\n contextToken ?? this.contextTokens.get(to);\n if (!ct) {\n throw new Error(\n `No context_token for user ${to}.`,\n );\n }\n return sendFileMessage(\n this.api,\n to,\n fileName,\n uploaded,\n ct,\n caption,\n );\n }\n\n // -----------------------------------------------------------------------\n // Typing indicator\n // -----------------------------------------------------------------------\n\n /**\n * Send a \"typing\" indicator to the user. Requires a typing_ticket\n * (obtained from getConfig).\n */\n async sendTyping(\n userId: string,\n typingTicket: string,\n status: \"typing\" | \"cancel\" = \"typing\",\n ): Promise {\n const req: SendTypingReq = {\n ilink_user_id: userId,\n typing_ticket: typingTicket,\n status:\n status === \"typing\"\n ? 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