744 lines
26 KiB
Rust
744 lines
26 KiB
Rust
//! Main WeChatBot client.
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use std::collections::HashMap;
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use std::path::Path;
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use std::sync::Arc;
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use tokio::sync::{Mutex, RwLock};
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use tokio::time::{sleep, Duration};
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use tracing::{error, info, warn};
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use crate::cdn::CdnClient;
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use crate::crypto;
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use crate::error::{Result, WeChatBotError};
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use crate::protocol::{self, ILinkClient};
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use crate::types::*;
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use md5::{Digest, Md5};
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use rand::Rng;
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use serde_json::json;
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/// Message handler callback type.
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pub type MessageHandler = Box<dyn Fn(&IncomingMessage) + Send + Sync>;
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/// Bot configuration options.
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pub struct BotOptions {
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pub base_url: Option<String>,
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pub cred_path: Option<String>,
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pub on_qr_url: Option<Box<dyn Fn(&str) + Send + Sync>>,
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pub on_error: Option<Box<dyn Fn(&WeChatBotError) + Send + Sync>>,
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}
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impl Default for BotOptions {
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fn default() -> Self {
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Self {
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base_url: None,
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cred_path: None,
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on_qr_url: None,
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on_error: None,
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}
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}
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}
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/// WeChatBot is the main entry point.
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pub struct WeChatBot {
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client: Arc<ILinkClient>,
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cdn: CdnClient,
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credentials: RwLock<Option<Credentials>>,
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context_tokens: RwLock<HashMap<String, String>>,
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handlers: Mutex<Vec<MessageHandler>>,
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cursor: RwLock<String>,
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base_url: RwLock<String>,
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cred_path: Option<String>,
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stopped: RwLock<bool>,
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on_qr_url: Option<Box<dyn Fn(&str) + Send + Sync>>,
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on_error: Option<Box<dyn Fn(&WeChatBotError) + Send + Sync>>,
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}
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impl WeChatBot {
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/// Create a new bot instance.
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pub fn new(opts: BotOptions) -> Self {
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Self {
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client: Arc::new(ILinkClient::new()),
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cdn: CdnClient::new(),
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credentials: RwLock::new(None),
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context_tokens: RwLock::new(HashMap::new()),
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handlers: Mutex::new(Vec::new()),
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cursor: RwLock::new(String::new()),
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base_url: RwLock::new(
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opts.base_url
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.unwrap_or_else(|| protocol::DEFAULT_BASE_URL.to_string()),
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),
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cred_path: opts.cred_path,
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stopped: RwLock::new(false),
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on_qr_url: opts.on_qr_url,
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on_error: opts.on_error,
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}
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}
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/// Maximum number of QR code refresh attempts before giving up.
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const MAX_QR_REFRESH: u32 = 3;
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/// Fixed API base URL for QR code requests.
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const FIXED_QR_BASE_URL: &'static str = "https://ilinkai.weixin.qq.com";
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/// Login via QR code. Returns credentials on success.
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pub async fn login(&self, force: bool) -> Result<Credentials> {
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let base_url = self.base_url.read().await.clone();
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if !force {
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if let Some(creds) = self.load_credentials().await? {
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*self.credentials.write().await = Some(creds.clone());
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*self.base_url.write().await = creds.base_url.clone();
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info!("Loaded stored credentials for {}", creds.user_id);
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return Ok(creds);
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}
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}
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// QR code login flow
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let mut qr_refresh_count = 0u32;
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loop {
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qr_refresh_count += 1;
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if qr_refresh_count > Self::MAX_QR_REFRESH {
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return Err(WeChatBotError::Auth(format!(
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"QR code expired {} times — login aborted",
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Self::MAX_QR_REFRESH
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)));
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}
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let qr = self.client.get_qr_code(Self::FIXED_QR_BASE_URL).await?;
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if let Some(ref cb) = self.on_qr_url {
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cb(&qr.qrcode_img_content);
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} else {
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eprintln!("[wechatbot] Scan: {}", qr.qrcode_img_content);
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}
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let mut last_status = String::new();
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let mut current_poll_base_url = Self::FIXED_QR_BASE_URL.to_string();
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loop {
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let status = self
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.client
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.poll_qr_status(¤t_poll_base_url, &qr.qrcode)
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.await?;
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if status.status != last_status {
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last_status = status.status.clone();
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match status.status.as_str() {
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"scaned" => info!("QR scanned — confirm in WeChat"),
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"expired" => warn!("QR expired — requesting new one"),
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"confirmed" => info!("Login confirmed"),
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_ => {}
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}
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}
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if status.status == "confirmed" {
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let token = status
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.bot_token
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.ok_or_else(|| WeChatBotError::Auth("missing bot_token".into()))?;
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let creds = Credentials {
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token,
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base_url: status.baseurl.unwrap_or_else(|| base_url.clone()),
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account_id: status.ilink_bot_id.unwrap_or_default(),
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user_id: status.ilink_user_id.unwrap_or_default(),
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saved_at: Some(chrono_now()),
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};
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self.save_credentials(&creds).await?;
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*self.credentials.write().await = Some(creds.clone());
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*self.base_url.write().await = creds.base_url.clone();
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return Ok(creds);
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}
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// Handle IDC redirect
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if status.status == "scaned_but_redirect" {
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if let Some(ref host) = status.redirect_host {
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current_poll_base_url = format!("https://{}", host);
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info!("IDC redirect, switching polling host to {}", host);
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} else {
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warn!("Received scaned_but_redirect but redirect_host is missing");
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}
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sleep(Duration::from_secs(2)).await;
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continue;
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}
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if status.status == "expired" {
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break;
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}
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sleep(Duration::from_secs(2)).await;
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}
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}
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}
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/// Register a message handler.
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pub async fn on_message(&self, handler: MessageHandler) {
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self.handlers.lock().await.push(handler);
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}
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/// Reply to an incoming message.
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pub async fn reply(&self, msg: &IncomingMessage, text: &str) -> Result<()> {
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self.context_tokens
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.write()
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.await
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.insert(msg.user_id.clone(), msg.context_token.clone());
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self.send_text(&msg.user_id, text, &msg.context_token).await
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}
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/// Send text to a user (needs prior context_token).
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pub async fn send(&self, user_id: &str, text: &str) -> Result<()> {
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let ct = self.context_tokens.read().await.get(user_id).cloned();
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let ct = ct.ok_or_else(|| WeChatBotError::NoContext(user_id.to_string()))?;
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self.send_text(user_id, text, &ct).await
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}
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/// Show "typing..." indicator.
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pub async fn send_typing(&self, user_id: &str) -> Result<()> {
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let ct = self.context_tokens.read().await.get(user_id).cloned();
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let ct = ct.ok_or_else(|| WeChatBotError::NoContext(user_id.to_string()))?;
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let (base_url, token) = self.get_auth().await?;
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let config = self
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.client
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.get_config(&base_url, &token, user_id, &ct)
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.await?;
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if let Some(ticket) = config.typing_ticket {
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self.client
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.send_typing(&base_url, &token, user_id, &ticket, 1)
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.await?;
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}
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Ok(())
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}
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/// Reply with media content (image, video, or file).
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pub async fn reply_media(&self, msg: &IncomingMessage, content: SendContent) -> Result<()> {
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self.context_tokens
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.write()
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.await
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.insert(msg.user_id.clone(), msg.context_token.clone());
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self.send_content(&msg.user_id, &msg.context_token, content)
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.await
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}
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/// Send any content type to a user (needs prior context_token).
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pub async fn send_media(&self, user_id: &str, content: SendContent) -> Result<()> {
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let ct = self.context_tokens.read().await.get(user_id).cloned();
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let ct = ct.ok_or_else(|| WeChatBotError::NoContext(user_id.to_string()))?;
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self.send_content(user_id, &ct, content).await
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}
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/// Download media from an incoming message.
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/// Returns None if the message has no media. Priority: image > file > video > voice.
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pub async fn download(&self, msg: &IncomingMessage) -> Result<Option<DownloadedMedia>> {
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if let Some(img) = msg.images.first() {
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if let Some(ref media) = img.media {
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let data = self.cdn.download(media, img.aes_key.as_deref()).await?;
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return Ok(Some(DownloadedMedia {
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data,
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media_type: "image".into(),
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file_name: None,
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format: None,
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}));
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}
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}
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if let Some(file) = msg.files.first() {
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if let Some(ref media) = file.media {
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let data = self.cdn.download(media, None).await?;
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return Ok(Some(DownloadedMedia {
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data,
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media_type: "file".into(),
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file_name: Some(file.file_name.clone().unwrap_or_else(|| "file.bin".into())),
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format: None,
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}));
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}
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}
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if let Some(video) = msg.videos.first() {
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if let Some(ref media) = video.media {
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let data = self.cdn.download(media, None).await?;
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return Ok(Some(DownloadedMedia {
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data,
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media_type: "video".into(),
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file_name: None,
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format: None,
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}));
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}
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}
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if let Some(voice) = msg.voices.first() {
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if let Some(ref media) = voice.media {
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let data = self.cdn.download(media, None).await?;
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return Ok(Some(DownloadedMedia {
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data,
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media_type: "voice".into(),
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file_name: None,
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format: Some("silk".into()),
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}));
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}
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}
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Ok(None)
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}
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/// Download and decrypt a raw CDN media reference.
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pub async fn download_raw(
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&self,
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media: &CDNMedia,
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aeskey_override: Option<&str>,
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) -> Result<Vec<u8>> {
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self.cdn.download(media, aeskey_override).await
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}
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/// Upload data to WeChat CDN without sending a message.
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pub async fn upload(
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&self,
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data: &[u8],
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user_id: &str,
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media_type: i32,
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) -> Result<UploadResult> {
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let (base_url, token) = self.get_auth().await?;
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self.cdn_upload(&base_url, &token, data, user_id, media_type)
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.await
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}
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/// Start the long-poll loop. Blocks until stopped.
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pub async fn run(&self) -> Result<()> {
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*self.stopped.write().await = false;
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info!("Long-poll loop started");
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let mut retry_delay = Duration::from_secs(1);
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loop {
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if *self.stopped.read().await {
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break;
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}
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let (base_url, token) = self.get_auth().await?;
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let cursor = self.cursor.read().await.clone();
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match self.client.get_updates(&base_url, &token, &cursor).await {
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Ok(updates) => {
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if !updates.get_updates_buf.is_empty() {
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*self.cursor.write().await = updates.get_updates_buf;
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}
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retry_delay = Duration::from_secs(1);
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for wire in &updates.msgs {
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self.remember_context(wire).await;
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if let Some(incoming) = IncomingMessage::from_wire(wire) {
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let handlers = self.handlers.lock().await;
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for handler in handlers.iter() {
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handler(&incoming);
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}
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}
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}
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}
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Err(e) if e.is_session_expired() => {
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warn!("Session expired — re-login required");
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*self.context_tokens.write().await = HashMap::new();
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*self.cursor.write().await = String::new();
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if let Err(e) = self.login(true).await {
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self.report_error(&e);
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}
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continue;
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}
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Err(e) => {
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self.report_error(&e);
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sleep(retry_delay).await;
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retry_delay = std::cmp::min(retry_delay * 2, Duration::from_secs(10));
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continue;
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}
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}
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}
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info!("Long-poll loop stopped");
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Ok(())
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}
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/// Stop the bot.
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pub async fn stop(&self) {
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*self.stopped.write().await = true;
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}
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// --- internal media ---
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fn send_content<'a>(
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&'a self,
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user_id: &'a str,
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context_token: &'a str,
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content: SendContent,
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) -> std::pin::Pin<Box<dyn std::future::Future<Output = Result<()>> + Send + 'a>> {
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Box::pin(async move {
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let (base_url, token) = self.get_auth().await?;
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match content {
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SendContent::Text(text) => self.send_text(user_id, &text, context_token).await,
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SendContent::Image { data, caption } => {
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let result = self
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.cdn_upload(&base_url, &token, &data, user_id, 1)
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.await?;
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let mut items = Vec::new();
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if let Some(cap) = caption {
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items.push(json!({"type": 1, "text_item": {"text": cap}}));
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}
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items.push(json!({"type": 2, "image_item": {
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"media": cdn_media_json(&result.media),
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"mid_size": result.encrypted_file_size,
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}}));
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let msg = protocol::build_media_message(user_id, context_token, items);
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self.client.send_message(&base_url, &token, &msg).await
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}
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SendContent::Video { data, caption } => {
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let result = self
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.cdn_upload(&base_url, &token, &data, user_id, 2)
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.await?;
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let mut items = Vec::new();
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if let Some(cap) = caption {
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items.push(json!({"type": 1, "text_item": {"text": cap}}));
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}
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items.push(json!({"type": 5, "video_item": {
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"media": cdn_media_json(&result.media),
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"video_size": result.encrypted_file_size,
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}}));
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let msg = protocol::build_media_message(user_id, context_token, items);
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self.client.send_message(&base_url, &token, &msg).await
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}
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SendContent::File {
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data,
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file_name,
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caption,
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} => {
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let cat = categorize_by_extension(&file_name);
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match cat {
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"image" => {
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self.send_content(
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user_id,
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context_token,
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SendContent::Image { data, caption },
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)
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.await
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}
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"video" => {
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self.send_content(
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user_id,
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context_token,
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SendContent::Video { data, caption },
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)
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.await
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}
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_ => {
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if let Some(cap) = caption {
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self.send_text(user_id, &cap, context_token).await?;
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}
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let data_len = data.len();
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let result = self
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.cdn_upload(&base_url, &token, &data, user_id, 3)
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.await?;
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let items = vec![json!({"type": 4, "file_item": {
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"media": cdn_media_json(&result.media),
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"file_name": file_name,
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"len": data_len.to_string(),
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}})];
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let msg = protocol::build_media_message(user_id, context_token, items);
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self.client.send_message(&base_url, &token, &msg).await
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}
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}
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}
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}
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})
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}
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async fn cdn_upload(
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&self,
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base_url: &str,
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token: &str,
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data: &[u8],
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user_id: &str,
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media_type: i32,
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) -> Result<UploadResult> {
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let aes_key = crypto::generate_aes_key();
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let ciphertext = crypto::encrypt_aes_ecb(data, &aes_key);
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let mut filekey_buf = [0u8; 16];
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rand::rng().fill_bytes(&mut filekey_buf);
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let filekey = hex::encode(filekey_buf);
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let raw_md5 = hex::encode(Md5::digest(data));
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let params = protocol::GetUploadUrlParams {
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filekey: filekey.clone(),
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media_type,
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to_user_id: user_id.to_string(),
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rawsize: data.len(),
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rawfilemd5: raw_md5,
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filesize: ciphertext.len(),
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no_need_thumb: true,
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aeskey: crypto::encode_aes_key_hex(&aes_key),
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};
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let upload_resp = self.client.get_upload_url(base_url, token, ¶ms).await?;
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let upload_param = upload_resp.upload_param.ok_or_else(|| {
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WeChatBotError::Media("getuploadurl did not return upload_param".into())
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})?;
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let upload_url =
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protocol::build_cdn_upload_url(protocol::CDN_BASE_URL, &upload_param, &filekey);
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let encrypted_file_size = ciphertext.len();
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let encrypt_query_param = self.client.upload_to_cdn(&upload_url, &ciphertext).await?;
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Ok(UploadResult {
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media: CDNMedia {
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encrypt_query_param,
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aes_key: crypto::encode_aes_key_base64(&aes_key),
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encrypt_type: Some(1),
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full_url: None,
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},
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aes_key,
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encrypted_file_size,
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})
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}
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// --- internal text ---
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async fn send_text(&self, user_id: &str, text: &str, context_token: &str) -> Result<()> {
|
|
let (base_url, token) = self.get_auth().await?;
|
|
for chunk in chunk_text(text, 4000) {
|
|
let msg = protocol::build_text_message(user_id, context_token, &chunk);
|
|
self.client.send_message(&base_url, &token, &msg).await?;
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
async fn remember_context(&self, wire: &WireMessage) {
|
|
let user_id = if wire.message_type == MessageType::User {
|
|
&wire.from_user_id
|
|
} else {
|
|
&wire.to_user_id
|
|
};
|
|
if !user_id.is_empty() && !wire.context_token.is_empty() {
|
|
self.context_tokens
|
|
.write()
|
|
.await
|
|
.insert(user_id.clone(), wire.context_token.clone());
|
|
}
|
|
}
|
|
|
|
async fn get_auth(&self) -> Result<(String, String)> {
|
|
let creds = self.credentials.read().await;
|
|
let creds = creds
|
|
.as_ref()
|
|
.ok_or_else(|| WeChatBotError::Auth("not logged in".into()))?;
|
|
Ok((creds.base_url.clone(), creds.token.clone()))
|
|
}
|
|
|
|
async fn load_credentials(&self) -> Result<Option<Credentials>> {
|
|
let path = self.cred_path.clone().unwrap_or_else(default_cred_path);
|
|
match tokio::fs::read_to_string(&path).await {
|
|
Ok(data) => Ok(Some(serde_json::from_str(&data)?)),
|
|
Err(e) if e.kind() == std::io::ErrorKind::NotFound => Ok(None),
|
|
Err(e) => Err(e.into()),
|
|
}
|
|
}
|
|
|
|
async fn save_credentials(&self, creds: &Credentials) -> Result<()> {
|
|
let path = self.cred_path.clone().unwrap_or_else(default_cred_path);
|
|
let dir = std::path::Path::new(&path).parent().unwrap();
|
|
tokio::fs::create_dir_all(dir).await?;
|
|
let data = serde_json::to_string_pretty(creds)?;
|
|
tokio::fs::write(&path, format!("{}\n", data)).await?;
|
|
Ok(())
|
|
}
|
|
|
|
fn report_error(&self, err: &WeChatBotError) {
|
|
error!("{}", err);
|
|
if let Some(ref cb) = self.on_error {
|
|
cb(err);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Content to send via reply_media / send_media.
|
|
pub enum SendContent {
|
|
Text(String),
|
|
Image {
|
|
data: Vec<u8>,
|
|
caption: Option<String>,
|
|
},
|
|
Video {
|
|
data: Vec<u8>,
|
|
caption: Option<String>,
|
|
},
|
|
File {
|
|
data: Vec<u8>,
|
|
file_name: String,
|
|
caption: Option<String>,
|
|
},
|
|
}
|
|
|
|
fn cdn_media_json(media: &CDNMedia) -> serde_json::Value {
|
|
let mut v = json!({
|
|
"encrypt_query_param": media.encrypt_query_param,
|
|
"aes_key": media.aes_key,
|
|
});
|
|
if let Some(et) = media.encrypt_type {
|
|
v["encrypt_type"] = json!(et);
|
|
}
|
|
v
|
|
}
|
|
|
|
fn categorize_by_extension(filename: &str) -> &'static str {
|
|
let ext = Path::new(filename)
|
|
.extension()
|
|
.and_then(|e| e.to_str())
|
|
.unwrap_or("")
|
|
.to_lowercase();
|
|
match ext.as_str() {
|
|
"png" | "jpg" | "jpeg" | "gif" | "webp" | "bmp" | "svg" => "image",
|
|
"mp4" | "mov" | "webm" | "mkv" | "avi" => "video",
|
|
_ => "file",
|
|
}
|
|
}
|
|
|
|
fn chunk_text(text: &str, limit: usize) -> Vec<String> {
|
|
if text.len() <= limit {
|
|
return vec![text.to_string()];
|
|
}
|
|
let mut chunks = Vec::new();
|
|
let mut remaining = text;
|
|
while !remaining.is_empty() {
|
|
if remaining.len() <= limit {
|
|
chunks.push(remaining.to_string());
|
|
break;
|
|
}
|
|
// Find the nearest valid character boundary
|
|
let end = remaining.floor_char_boundary(limit);
|
|
let window = &remaining[..end];
|
|
let cut = window
|
|
.rfind("\n\n")
|
|
.filter(|&i| i > end * 3 / 10)
|
|
.map(|i| i + 2)
|
|
.or_else(|| {
|
|
window
|
|
.rfind('\n')
|
|
.filter(|&i| i > end * 3 / 10)
|
|
.map(|i| i + 1)
|
|
})
|
|
.or_else(|| {
|
|
window
|
|
.rfind(' ')
|
|
.filter(|&i| i > end * 3 / 10)
|
|
.map(|i| i + 1)
|
|
})
|
|
.unwrap_or(end);
|
|
chunks.push(remaining[..cut].to_string());
|
|
remaining = &remaining[cut..];
|
|
}
|
|
if chunks.is_empty() {
|
|
vec![String::new()]
|
|
} else {
|
|
chunks
|
|
}
|
|
}
|
|
|
|
fn default_cred_path() -> String {
|
|
let home = dirs_next::home_dir().unwrap_or_else(|| ".".into());
|
|
home.join(".wechatbot")
|
|
.join("credentials.json")
|
|
.to_string_lossy()
|
|
.to_string()
|
|
}
|
|
|
|
fn chrono_now() -> String {
|
|
// Simple ISO 8601 without chrono dependency
|
|
let dur = std::time::SystemTime::now()
|
|
.duration_since(std::time::UNIX_EPOCH)
|
|
.unwrap();
|
|
format!("{}Z", dur.as_secs())
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn chunk_text_short() {
|
|
let chunks = chunk_text("hello", 100);
|
|
assert_eq!(chunks, vec!["hello"]);
|
|
}
|
|
|
|
#[test]
|
|
fn chunk_text_empty() {
|
|
let chunks = chunk_text("", 100);
|
|
assert_eq!(chunks, vec![""]);
|
|
}
|
|
|
|
#[test]
|
|
fn chunk_text_splits_on_paragraph() {
|
|
let text = "aaaa\n\nbbbb";
|
|
let chunks = chunk_text(text, 7);
|
|
assert_eq!(chunks, vec!["aaaa\n\n", "bbbb"]);
|
|
}
|
|
|
|
#[test]
|
|
fn chunk_text_splits_on_newline() {
|
|
let text = "aaaa\nbbbb";
|
|
let chunks = chunk_text(text, 7);
|
|
assert_eq!(chunks, vec!["aaaa\n", "bbbb"]);
|
|
}
|
|
|
|
#[test]
|
|
fn chunk_text_exact_limit() {
|
|
let text = "abcdef";
|
|
let chunks = chunk_text(text, 6);
|
|
assert_eq!(chunks, vec!["abcdef"]);
|
|
}
|
|
|
|
#[test]
|
|
fn default_cred_path_not_empty() {
|
|
let path = default_cred_path();
|
|
assert!(!path.is_empty());
|
|
assert!(path.contains(".wechatbot"));
|
|
assert!(path.contains("credentials.json"));
|
|
}
|
|
|
|
#[test]
|
|
fn categorize_image_extensions() {
|
|
assert_eq!(categorize_by_extension("photo.png"), "image");
|
|
assert_eq!(categorize_by_extension("photo.JPG"), "image");
|
|
assert_eq!(categorize_by_extension("anim.gif"), "image");
|
|
assert_eq!(categorize_by_extension("pic.webp"), "image");
|
|
}
|
|
|
|
#[test]
|
|
fn categorize_video_extensions() {
|
|
assert_eq!(categorize_by_extension("clip.mp4"), "video");
|
|
assert_eq!(categorize_by_extension("clip.MOV"), "video");
|
|
assert_eq!(categorize_by_extension("movie.webm"), "video");
|
|
}
|
|
|
|
#[test]
|
|
fn categorize_file_extensions() {
|
|
assert_eq!(categorize_by_extension("report.pdf"), "file");
|
|
assert_eq!(categorize_by_extension("data.csv"), "file");
|
|
assert_eq!(categorize_by_extension("noext"), "file");
|
|
}
|
|
|
|
#[test]
|
|
fn cdn_media_json_with_encrypt_type() {
|
|
let media = CDNMedia {
|
|
encrypt_query_param: "param=1".to_string(),
|
|
aes_key: "key123".to_string(),
|
|
encrypt_type: Some(1),
|
|
full_url: None,
|
|
};
|
|
let j = cdn_media_json(&media);
|
|
assert_eq!(j["encrypt_query_param"], "param=1");
|
|
assert_eq!(j["aes_key"], "key123");
|
|
assert_eq!(j["encrypt_type"], 1);
|
|
}
|
|
|
|
#[test]
|
|
fn cdn_media_json_without_encrypt_type() {
|
|
let media = CDNMedia {
|
|
encrypt_query_param: "p".to_string(),
|
|
aes_key: "k".to_string(),
|
|
encrypt_type: None,
|
|
full_url: None,
|
|
};
|
|
let j = cdn_media_json(&media);
|
|
assert!(j.get("encrypt_type").is_none());
|
|
}
|
|
}
|