feat: support attachments in manual reply (photo/video/document/voice) - Add _extract_media: extract media info from Telegram messages - Add _download_tg_file: download files from Telegram API - Modify _handle_message: accumulate attachments in awaiting_reply, send with text - Modify _handle_update: process messages without text (media-only) - Modify smtp_client.send_reply: support MIME multipart with attachments - Add comprehensive tests (11 tests, all passing)

src/smtp_client.py

@@ -2,6 +2,9 @@ import smtplib
 import logging
 from email.mime.text import MIMEText
 from email.mime.multipart import MIMEMultipart
+from email.mime.base import MIMEBase
+from email import encoders
+from pathlib import Path
 from src.config import EmailAccount
 from src.retry import retry
 
@@ -9,7 +12,13 @@ logger = logging.getLogger(__name__)
 
 
 @retry()
-def send_reply(account: EmailAccount, to_addr: str, subject: str, body: str):
+def send_reply(account: EmailAccount, to_addr: str, subject: str, body: str,
+               attachments: list[tuple[str, str]] | None = None):
+    """发送回复邮件，支持附件。
+
+    Args:
+        attachments: [(本地文件路径, mime_type), ...] 列表
+    """
     if not account.smtp:
         raise RuntimeError(f"账号 {account.username} 未配置 SMTP")
 
@@ -26,13 +35,32 @@ def send_reply(account: EmailAccount, to_addr: str, subject: str, body: str):
     logger.info("SMTP 登录成功")
 
     reply_subject = subject if subject.lower().startswith("re:") else f"Re: {subject}"
-    logger.info("SMTP 发送: to=%s subject=%s body=%d 字符", to_addr, reply_subject, len(body))
+    logger.info("SMTP 发送: to=%s subject=%s body=%d 字符 attachments=%d",
+                to_addr, reply_subject, len(body), len(attachments or []))
+
+    if attachments:
+        msg = MIMEMultipart()
+        msg.attach(MIMEText(body, "plain", "utf-8"))
+        for filepath, mime_type in attachments:
+            p = Path(filepath)
+            if not p.exists():
+                logger.warning("  附件不存在: %s", filepath)
+                continue
+            maintype, subtype = mime_type.split("/", 1)
+            with open(p, "rb") as f:
+                part = MIMEBase(maintype, subtype)
+                part.set_payload(f.read())
+            encoders.encode_base64(part)
+            part.add_header("Content-Disposition", "attachment", filename=p.name)
+            msg.attach(part)
+            logger.info("  添加附件: %s (%s, %d bytes)", p.name, mime_type, p.stat().st_size)
+    else:
+        msg = MIMEMultipart("alternative")
+        msg.attach(MIMEText(body, "plain", "utf-8"))
 
-    msg = MIMEMultipart("alternative")
     msg["From"] = account.username
     msg["To"] = to_addr
     msg["Subject"] = reply_subject
-    msg.attach(MIMEText(body, "plain", "utf-8"))
 
     conn.sendmail(account.username, [to_addr], msg.as_string())
     conn.quit()