Fix Telegram proxy transport via CONNECT tunnel

bot/telegram_api.py

@@ -1,33 +1,57 @@
 from __future__ import annotations
 
+import http.client
 import json
 from typing import Any
-from urllib import parse, request as urllib_request
+from urllib import parse
 
 
 class TelegramAPI:
     def __init__(self, token: str, proxy_url: str | None = None) -> None:
-        self.base_url = f"https://api.telegram.org/bot{token}"
-        handlers = []
-        if proxy_url:
-            handlers.append(urllib_request.ProxyHandler({"https": proxy_url, "http": proxy_url}))
-        self.opener = urllib_request.build_opener(*handlers) if handlers else urllib_request.build_opener()
+        self.host = "api.telegram.org"
+        self.base_path = f"/bot{token}"
+        self.proxy = parse.urlparse(proxy_url) if proxy_url else None
+
+    def _connection(self) -> http.client.HTTPSConnection:
+        if self.proxy:
+            conn = http.client.HTTPSConnection(
+                self.proxy.hostname,
+                self.proxy.port or 443,
+                timeout=90,
+            )
+            conn.set_tunnel(self.host, 443)
+            return conn
+        return http.client.HTTPSConnection(self.host, 443, timeout=90)
 
     def _post(self, method: str, payload: dict[str, Any]) -> dict[str, Any]:
         data = json.dumps(payload).encode("utf-8")
-        req = urllib_request.Request(
-            f"{self.base_url}/{method}",
-            data=data,
+        conn = self._connection()
+        try:
+            conn.request(
+                "POST",
+                f"{self.base_path}/{method}",
+                body=data,
                 headers={"Content-Type": "application/json"},
-            method="POST",
             )
-        with self.opener.open(req, timeout=90) as response:
-            return json.loads(response.read().decode("utf-8"))
+            response = conn.getresponse()
+            body = response.read().decode("utf-8")
+        finally:
+            conn.close()
+        return json.loads(body)
 
     def _get(self, method: str, params: dict[str, Any]) -> dict[str, Any]:
         query = parse.urlencode(params)
-        with self.opener.open(f"{self.base_url}/{method}?{query}", timeout=90) as response:
-            return json.loads(response.read().decode("utf-8"))
+        path = f"{self.base_path}/{method}"
+        if query:
+            path = f"{path}?{query}"
+        conn = self._connection()
+        try:
+            conn.request("GET", path)
+            response = conn.getresponse()
+            body = response.read().decode("utf-8")
+        finally:
+            conn.close()
+        return json.loads(body)
 
     def get_updates(self, offset: int | None, timeout: int) -> list[dict[str, Any]]:
         params: dict[str, Any] = {"timeout": timeout}