feat(channels): add WeChat Official Account support

This PR introduces a new extension @haiyanfengli-llc/webhook-server that adds support for WeChat Official Accounts (Weixin Service/Subscription Accounts).

It works by exposing a webhook server that interfaces with a self-hosted WeChat Bridge, allowing Clawdbot to send and receive messages from WeChat users.

Key Changes:

Added extensions/wechat with the plugin implementation.
Implemented fastify server for efficient webhook handling.
Added full documentation in
PLUGIN_USAGE.md
.
AI/Vibe-Coded:

 AI-Assisted: Yes (Google Antigravity)
 Degree of Testing: Lightly tested (Verified with local WeChat Bridge and test account)
 Understanding: Confirmed (I understand how the webhook/bridge architecture works)
Related Links:

Companion Bridge Repository

extensions/clawdbot-plugin-webhook-server/PLUGIN_USAGE.md

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+# Clawdbot WeChat Channel Plugin
+
+Connect your Clawdbot agent to WeChat Official Accounts.
+
+**This plugin is part of the Clawdbot WeChat Integration Suite.**
+For full source code, issues, and bridge deployment guide, please visit our GitHub repository:
+👉 **[https://github.com/NannaOlympicBroadcast/clawdbot-wechat-plugin](https://github.com/NannaOlympicBroadcast/clawdbot-wechat-plugin)**
+
+---
+
+## 🚀 Installation
+
+Install the plugin from NPM:
+
+```bash
+clawdbot plugins install @haiyanfengli-llc/webhook-server
+```
+
+## ⚙️ Configuration
+
+Add the following configuration to your Clawdbot `config.yaml`:
+
+```yaml
+channels:
+  wechat:
+    enabled: true
+    config:
+      # Optional: Explicitly set the callback URL if auto-detection fails
+      # callbackUrl: "http://<bridge-host>:3000/callback"
+```
+
+## 🔗 Architecture
+
+This plugin requires the **WeChat Bridge** service to function.
+The bridge handles the communication with WeChat servers and forwards messages to this plugin.
+
+1.  **WeChat** sends message to **Bridge**.
+2.  **Bridge** forwards message to **Clawdbot Plugin**.
+3.  **Clawdbot Agent** processes message.
+4.  **Clawdbot Plugin** sends reply back to **Bridge**.
+5.  **Bridge** sends reply to **WeChat**.
+
+Please refer to the [GitHub Repository](https://github.com/NannaOlympicBroadcast/clawdbot-wechat-plugin) for instructions on how to deploy the Bridge.
+
+## 📋 Requirements
+
+*   Clawdbot v0.5.0 or later
+*   Self-hosted WeChat Bridge
+*   WeChat Service Account (服务号) or verified Subscription Account (认证订阅号)
+
+## 🤝 Commercial Support
+
+For commercial usage, verified builds, or enterprise support, please contact:
+📧 **nomorelighthouse@gmail.com**

extensions/clawdbot-plugin-webhook-server/clawdbot.plugin.json

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+{
+    "id": "webhook-server",
+    "name": "Webhook Server",
+    "version": "1.0.1",
+    "description": "Exposes a webhook HTTP server for receiving external messages and triggering agent tasks",
+    "author": "",
+    "license": "MIT",
+    "main": "dist/index.js",
+    "configSchema": {
+        "type": "object",
+        "properties": {
+            "port": {
+                "type": "number",
+                "default": 8765,
+                "description": "Port number for the webhook server"
+            },
+            "host": {
+                "type": "string",
+                "default": "0.0.0.0",
+                "description": "Host address to bind to"
+            },
+            "authToken": {
+                "type": "string",
+                "description": "Authentication token for incoming requests (Bearer token). Auto-generated if not provided."
+            },
+            "timeout": {
+                "type": "number",
+                "default": 300000,
+                "description": "Maximum time (ms) to wait for agent task completion"
+            },
+            "agentId": {
+                "type": "string",
+                "default": "default",
+                "description": "Agent ID to use for processing messages (e.g., 'default', 'main')"
+            }
+        },
+        "required": []
+    },
+    "configDefaults": {
+        "port": 8765,
+        "host": "0.0.0.0",
+        "authToken": "$auto:uuid",
+        "timeout": 300000,
+        "agentId": "default"
+    },
+    "uiHints": {
+        "authToken": {
+            "label": "Auth Token",
+            "sensitive": true,
+            "placeholder": "Auto-generated secure token"
+        },
+        "port": {
+            "label": "Server Port",
+            "placeholder": "8765"
+        },
+        "host": {
+            "label": "Bind Host",
+            "placeholder": "0.0.0.0"
+        },
+        "timeout": {
+            "label": "Task Timeout (ms)",
+            "placeholder": "300000"
+        }
+    }
+}

extensions/clawdbot-plugin-webhook-server/package.json

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+{
+    "name": "@haiyanfengli-llc/webhook-server",
+    "version": "1.0.0",
+    "description": "Clawdbot plugin that exposes a webhook server for external integrations",
+    "main": "dist/index.js",
+    "types": "dist/index.d.ts",
+    "scripts": {
+        "build": "tsc",
+        "dev": "tsc -w",
+        "test": "vitest run",
+        "prepublishOnly": "npm run build"
+    },
+    "files": [
+        "dist",
+        "clawdbot.plugin.json"
+    ],
+    "keywords": [
+        "clawdbot",
+        "plugin",
+        "webhook",
+        "wechat"
+    ],
+    "author": "",
+    "license": "MIT",
+    "clawdbot": {
+        "extensions": [
+            "dist/index.js"
+        ]
+    },
+    "dependencies": {
+        "fastify": "^4.26.1",
+        "axios": "^1.6.7"
+    },
+    "devDependencies": {
+        "@types/node": "^20.11.19",
+        "typescript": "^5.3.3",
+        "vitest": "^1.3.1"
+    },
+    "peerDependencies": {
+        "clawdbot": ">=1.0.0"
+    }
+}

extensions/clawdbot-plugin-webhook-server/src/declarations.d.ts

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+declare module 'clawdbot/plugin-sdk' {
+    export interface ClawdbotPluginApi {
+        logger: {
+            info: (msg: string, ...args: unknown[]) => void;
+            warn: (msg: string, ...args: unknown[]) => void;
+            error: (msg: string, ...args: unknown[]) => void;
+            debug: (msg: string, ...args: unknown[]) => void;
+        };
+        config: ClawdbotConfig;
+        registerChannel: (options: { plugin: ChannelPlugin<any>; dock: ChannelDock }) => void;
+        registerHttpHandler: (handler: (req: any, res: any) => Promise<boolean> | boolean) => void;
+        runtime: PluginRuntime;
+        [key: string]: unknown;
+    }
+
+    export interface ClawdbotConfig {
+        plugins?: {
+            entries?: Record<string, { config?: any }>;
+        };
+        channels?: Record<string, any>;
+        [key: string]: unknown;
+    }
+
+    export interface PluginRuntime {
+        channel: {
+            routing?: {
+                resolveAgentRoute?: (params: any) => { sessionKey: string; agentId?: string; accountId?: string };
+            };
+            reply?: {
+                resolveEnvelopeFormatOptions?: (cfg: any) => any;
+                formatAgentEnvelope?: (params: any) => string;
+                finalizeInboundContext?: (params: any) => any;
+                dispatchReplyWithBufferedBlockDispatcher?: (params: {
+                    ctx: any;
+                    cfg: any;
+                    dispatcherOptions: {
+                        deliver: (payload: { text?: string }) => Promise<void>;
+                        onError: (err: unknown, info: { kind: string }) => void;
+                    };
+                }) => Promise<void>;
+            };
+            session?: {
+                readSessionUpdatedAt?: (params: any) => number | undefined;
+                resolveStorePath?: (store: any, params: { agentId?: string }) => string;
+                recordInboundSession?: (params: any) => Promise<void>;
+            };
+            [key: string]: unknown;
+        };
+        [key: string]: unknown;
+    }
+
+    export interface ChannelPlugin<T> {
+        id: string;
+        meta: any;
+        configSchema: any;
+        capabilities: any;
+        config: any;
+        reload?: any;
+        [key: string]: unknown;
+    }
+
+    export interface ChannelDock {
+        id: string;
+        capabilities: any;
+        config: any;
+        [key: string]: unknown;
+    }
+
+    export type MarkdownTableMode = 'code' | 'text' | 'image';
+
+    export const emptyPluginConfigSchema: () => any;
+    export const buildChannelConfigSchema: (schema: any) => any;
+    export const normalizeAccountId: (id: string | undefined) => string;
+    export const DEFAULT_ACCOUNT_ID: string;
+}

extensions/clawdbot-plugin-webhook-server/src/index.ts

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+import type {
+    ClawdbotPluginApi,
+    ChannelPlugin,
+    ChannelDock,
+    ClawdbotConfig,
+    PluginRuntime,
+    MarkdownTableMode
+} from 'clawdbot/plugin-sdk';
+import {
+    emptyPluginConfigSchema,
+    buildChannelConfigSchema,
+    normalizeAccountId,
+    DEFAULT_ACCOUNT_ID
+} from 'clawdbot/plugin-sdk';
+import axios from 'axios';
+import { IncomingMessage, ServerResponse } from 'http';
+import { setRuntime, getRuntime } from './runtime.js';
+import { z } from 'zod';
+
+// --- Types ---
+
+interface WeChatConfig {
+    authToken?: string;
+    callbackUrl?: string; // Optional default callback URL
+    allowFrom?: string[];
+    dmPolicy?: 'open' | 'pairing' | 'disabled';
+}
+
+interface WebhookPayload {
+    task: string;
+    callback_url?: string; // The bridge might send this
+    metadata?: {
+        openid?: string;
+        msg_type?: string;
+        msg_id?: string;
+        timestamp?: number;
+        nickname?: string;
+        [key: string]: unknown;
+    };
+}
+
+// --- Runtime Helper ---
+
+type CoreRuntime = PluginRuntime;
+
+// --- Webhook Handler ---
+
+async function readJsonBody(req: IncomingMessage): Promise<unknown> {
+    const chunks: Buffer[] = [];
+    return new Promise((resolve, reject) => {
+        req.on('data', (chunk) => chunks.push(chunk));
+        req.on('end', () => {
+            try {
+                const raw = Buffer.concat(chunks).toString('utf8');
+                resolve(raw ? JSON.parse(raw) : {});
+            } catch (e) {
+                reject(e);
+            }
+        });
+        req.on('error', reject);
+    });
+}
+
+// Global map to store callback URLs for sessions if needed, 
+// though we prefer to pass it through the pipeline via context or assume configuration.
+// For this refactor, we'll try to extract it from the context during delivery.
+
+async function handleWebhookRequest(req: IncomingMessage, res: ServerResponse): Promise<boolean> {
+    // Only handle POST /webhook (or configured path)
+    // The bridge might send to /, so we check method.
+    if (req.method !== 'POST') return false;
+
+    // Simple path check - in a real plugin we might want configurable paths
+    if (req.url && !req.url.endsWith('/webhook') && req.url !== '/') return false;
+
+    try {
+        const body = await readJsonBody(req) as WebhookPayload;
+
+        // Basic Validation
+        if (!body.task) {
+            res.statusCode = 400;
+            res.end(JSON.stringify({ error: 'Missing task' }));
+            return true;
+        }
+
+        // We accept the request immediately
+        res.statusCode = 202;
+        res.end(JSON.stringify({ status: 'accepted' }));
+
+        // Process in background
+        processMessageWithPipeline(body).catch(err => {
+            console.error('Pipeline processing error:', err);
+        });
+
+        return true;
+    } catch (err) {
+        console.error('Webhook handler error:', err);
+        res.statusCode = 500;
+        res.end('Internal Server Error');
+        return true;
+    }
+}
+
+// --- Pipeline ---
+
+async function processMessageWithPipeline(payload: WebhookPayload) {
+    const core = getRuntime();
+    // Assuming single-tenant/default account for now as per original code
+    // In a full implementation, we'd resolve the account based on the request (e.g. auth token)
+    const accountId = DEFAULT_ACCOUNT_ID;
+
+    // We need access to the config. 
+    // Since we don't have the full config object passed in, we might need to fetch it from runtime or similar.
+    // However, `dispatchReplyWithBufferedBlockDispatcher` takes `cfg`.
+    // In the Zalo example, `processUpdate` receives `config`.
+    // Here, we'll assume we can get the global config or pass a minimal one.
+    // For now, we'll try to read it from the core if possible or construct a placeholder.
+    // NOTE: In the original code, `pluginApi.config` was available. 
+    // In the new SDK structure, we should be careful. 
+    // `core.config` might not be directly exposed.
+    // BUT! `api.registerChannel` passes `cfg` to methods. `handleWebhookRequest` is outside that flow.
+    // We strictly need the config. 
+    // WORKAROUND: We will store the latest config in a global variable when the plugin is loaded/reloaded.
+
+    const config = _globalConfig || {};
+
+    const senderId = payload.metadata?.openid || 'unknown_user';
+    const senderName = payload.metadata?.nickname || `User ${senderId.slice(0, 4)}`;
+    const text = payload.task;
+    const chatId = senderId; // For DM, chat ID is usually user ID
+
+    // Construct IDs
+    const fromLabel = `wechat:${senderId}`;
+
+    // Authorization / Pairing Logic
+    // Simplified: Check allowFrom list
+    // In a full implementation, follow Zalo's `isSenderAllowed` and `pairing` logic
+
+    // Ensure config is not null
+    const safeConfig = config || {};
+
+    const route = core.channel.routing?.resolveAgentRoute?.({
+        cfg: safeConfig,
+        channel: 'wechat',
+        accountId: accountId,
+        peer: { kind: 'dm', id: chatId }
+    }) || {
+        // Fallback if routing fails (e.g. config not updated)
+        agentId: (safeConfig as any)?.plugins?.entries?.['webhook-server']?.config?.agentId || 'default',
+        accountId: accountId,
+        sessionKey: `wechat:${senderId}`
+    };
+
+    if (!route) {
+        // Should not happen with fallback, but TS check
+        console.error('Failed to resolve agent route');
+        return;
+    }
+
+    const sessionKey = route.sessionKey || `wechat:${senderId}`;
+
+    // Construct Context
+    // We need to pass the callback_url through to the delivery phase.
+    // We can use the 'Ctx' fields or `Originating...` fields if they allow custom data,
+    // or rely on `InboundContext` having flexible fields.
+    const callbackUrl = payload.callback_url;
+
+    // Get Store Path (using config.session?.store if available)
+    // We try to access config.session from the global config
+    const storePath = core.channel.session?.resolveStorePath?.((safeConfig as any).session?.store, { agentId: route.agentId });
+
+    // Format Envelope
+    const envelopeOptions = core.channel.reply?.resolveEnvelopeFormatOptions?.(safeConfig);
+    const previousTimestamp = core.channel.session?.readSessionUpdatedAt?.({
+        storePath,
+        sessionKey
+    });
+
+    const timestamp = payload.metadata?.timestamp ? payload.metadata.timestamp * 1000 : Date.now();
+
+    const formattedBody = core.channel.reply?.formatAgentEnvelope?.({
+        channel: 'WeChat',
+        from: senderName, // User friendly name
+        timestamp,
+        previousTimestamp,
+        envelope: envelopeOptions,
+        body: text
+    }) || text; // Fallback to raw text if formatter missing
+
+    const ctxPayload = core.channel.reply?.finalizeInboundContext?.({
+        Body: formattedBody,
+        RawBody: text,
+        From: `wechat:${senderId}`,
+        To: `wechat:bot`,
+        SessionKey: sessionKey,
+        AccountId: accountId,
+        AgentId: route.agentId || accountId, // Fix: Explicitly pass AgentId
+        ChatType: 'direct',
+        ConversationLabel: senderName,
+        SenderName: senderName,
+        SenderId: senderId,
+        Provider: 'wechat',
+        Surface: 'wechat',
+        // Pass callback_url here so we can retrieve it in deliver
+        _CallbackUrl: callbackUrl,
+    });
+
+    if (!ctxPayload) return;
+
+    // Record Session
+    await core.channel.session?.recordInboundSession?.({
+        storePath,
+        sessionKey,
+        ctx: ctxPayload
+    });
+
+    // Dispatch
+    await core.channel.reply?.dispatchReplyWithBufferedBlockDispatcher?.({
+        ctx: ctxPayload,
+        cfg: config,
+        dispatcherOptions: {
+            deliver: async (deliverPayload: { text?: string }) => {
+                await deliverWeChatReply({
+                    text: deliverPayload.text,
+                    callbackUrl: callbackUrl || (_globalConfig?.channels?.wechat?.config?.callbackUrl),
+                    originalPayload: payload
+                });
+            },
+            onError: (err: unknown, info: { kind: string }) => {
+                console.error(`WeChat dispatch error (${info.kind}):`, err);
+            }
+        }
+    });
+}
+
+// --- Delivery ---
+
+async function deliverWeChatReply(params: {
+    text?: string;
+    callbackUrl?: string;
+    originalPayload: WebhookPayload
+}) {
+    const { text, callbackUrl } = params;
+    if (!text || !callbackUrl) return;
+
+    try {
+        await axios.post(callbackUrl, {
+            success: true,
+            result: text,
+            // Add metadata if needed by Bridge
+            metadata: {
+                // model: ... (Not easily available in this callback without extra context)
+            }
+        });
+    } catch (error) {
+        console.error(`Failed to deliver reply to ${callbackUrl}:`, error);
+    }
+}
+
+// --- Plugin Definition ---
+
+let _globalConfig: ClawdbotConfig | null = null;
+
+const wechatPlugin: ChannelPlugin<any> = {
+    id: 'wechat',
+    meta: {
+        id: 'wechat',
+        label: 'WeChat',
+        selectionLabel: 'WeChat (Bridge)',
+        description: 'WeChat integration via Bridge Webhook',
+        docsPath: '',
+    },
+    configSchema: buildChannelConfigSchema(
+        z.object({
+            callbackUrl: z.string().optional().describe('URL to send replies to (e.g. Bridge URL)'),
+        }).extend({
+            accounts: z.object({}).catchall(z.object({
+                callbackUrl: z.string().optional(),
+            })).optional(),
+            defaultAccount: z.string().optional()
+        })
+    ),
+    capabilities: {
+        chatTypes: ['direct'], // Webhook acts like DM usually
+        media: false, // Set to true if supported
+        blockStreaming: true, // We prefer full blocks for webhook callbacks mostly
+    },
+    // Implement other required methods (minimal implementation)
+    // ...
+    config: {
+        // Minimal config helpers
+        listAccountIds: () => [DEFAULT_ACCOUNT_ID],
+        resolveAccount: (cfg: any) => ({
+            accountId: DEFAULT_ACCOUNT_ID,
+            name: 'Default',
+            enabled: true,
+            config: cfg?.plugins?.entries?.['webhook-server']?.config || {} // Fallback to old config location or new one?
+            // Ideally we move config to `channels.wechat`
+        }),
+        defaultAccountId: () => DEFAULT_ACCOUNT_ID,
+        isConfigured: () => true, // Always considered configured for now
+        describeAccount: () => ({ accountId: DEFAULT_ACCOUNT_ID, name: 'Default', enabled: true, configured: true }),
+    },
+    // We wrap 'reload' to capture config
+    reload: {
+        configPrefixes: ['channels.wechat', 'plugins.entries.webhook-server']
+    }
+};
+
+const wechatDock: ChannelDock = {
+    id: 'wechat',
+    capabilities: {
+        chatTypes: ['direct'],
+        media: false,
+        blockStreaming: true
+    },
+    config: {
+        // Helpers for UI
+        resolveAllowFrom: () => [],
+        formatAllowFrom: () => []
+    }
+};
+
+// Main Export
+export default {
+    id: 'wechat',
+    name: 'WeChat',
+    description: 'WeChat Channel Plugin',
+    configSchema: emptyPluginConfigSchema(),
+
+    register(api: ClawdbotPluginApi) {
+        setRuntime(api.runtime);
+        _globalConfig = api.config;
+
+        // Register as a channel
+        api.registerChannel({
+            plugin: wechatPlugin,
+            dock: wechatDock
+        });
+
+        // Register the HTTP handler for webhooks
+        // Note: The 'webhook-server' service is no longer needed in this pattern
+        // as registerHttpHandler hooks into the main server.
+        api.registerHttpHandler(handleWebhookRequest);
+
+        // Keep a listener for config changes if API supports it, 
+        // or just rely on the fact that `api.config` is a reference 
+        // (though usually it's a snapshot at register time). 
+        // Ideally we implement the `reload` capability in the plugin definition.
+
+        api.logger.info('WeChat Webhook Channel registered');
+    }
+};

extensions/clawdbot-plugin-webhook-server/src/runtime.ts

@@ -0,0 +1,14 @@
+import type { PluginRuntime } from "clawdbot/plugin-sdk";
+
+let runtime: PluginRuntime | null = null;
+
+export function setRuntime(next: PluginRuntime): void {
+    runtime = next;
+}
+
+export function getRuntime(): PluginRuntime {
+    if (!runtime) {
+        throw new Error("WeChat runtime not initialized");
+    }
+    return runtime;
+}

extensions/clawdbot-plugin-webhook-server/tsconfig.json

@@ -0,0 +1,25 @@
+{
+    "compilerOptions": {
+        "target": "ES2022",
+        "module": "NodeNext",
+        "moduleResolution": "NodeNext",
+        "lib": [
+            "ES2022"
+        ],
+        "outDir": "./dist",
+        "rootDir": "./src",
+        "strict": true,
+        "esModuleInterop": true,
+        "skipLibCheck": true,
+        "forceConsistentCasingInFileNames": true,
+        "declaration": true,
+        "sourceMap": true
+    },
+    "include": [
+        "src/**/*"
+    ],
+    "exclude": [
+        "node_modules",
+        "dist"
+    ]
+}