fix(channels): make proxy opt-in only for telegram/discord (#73)

src/bub/channels/utils.py

@@ -1,54 +1,11 @@
-"""Utils"""
+"""Channel utility helpers."""
 
 from __future__ import annotations
 
-import contextlib
-import os
-import platform
-import subprocess
-
-
-def _proxy_from_env() -> str | None:
-    for name in ("HTTPS_PROXY", "https_proxy", "ALL_PROXY", "all_proxy", "HTTP_PROXY", "http_proxy"):
-        value = os.getenv(name, "").strip()
-        if value:
-            return value
-    return None
-
-
-def _proxy_from_macos_system() -> str | None:
-    if platform.system() != "Darwin":
-        return None
-    with contextlib.suppress(FileNotFoundError, subprocess.SubprocessError, UnicodeDecodeError):
-        result = subprocess.run(["scutil", "--proxy"], capture_output=True, text=True, check=False, timeout=2)  # noqa: S607
-        if result.returncode != 0 or not result.stdout:
-            return None
-        data: dict[str, str] = {}
-        for line in result.stdout.splitlines():
-            if " : " not in line:
-                continue
-            key, value = line.split(" : ", 1)
-            data[key.strip()] = value.strip()
-        if data.get("HTTPSEnable") == "1":
-            host = data.get("HTTPSProxy")
-            port = data.get("HTTPSPort")
-            if host and port:
-                return f"http://{host}:{port}"
-        if data.get("HTTPEnable") == "1":
-            host = data.get("HTTPProxy")
-            port = data.get("HTTPPort")
-            if host and port:
-                return f"http://{host}:{port}"
-    return None
-
 
 def resolve_proxy(explicit_proxy: str | None) -> tuple[str | None, str]:
     if explicit_proxy:
         return explicit_proxy, "explicit"
-    env_proxy = _proxy_from_env()
-    if env_proxy:
-        return env_proxy, "env"
-    system_proxy = _proxy_from_macos_system()
-    if system_proxy:
-        return system_proxy, "system"
+
+    # Proxy usage must be opt-in; ignore ambient env vars and OS proxy settings.
     return None, "none"

tests/test_channels_proxy.py

@@ -1,28 +1,16 @@
 from __future__ import annotations
 
-from bub.channels.utils import _proxy_from_macos_system, resolve_proxy
+from bub.channels.utils import resolve_proxy
 
 
-def test_resolve_proxy_prefers_explicit_over_env(monkeypatch) -> None:
+def test_resolve_proxy_prefers_explicit_over_ambient(monkeypatch) -> None:
     monkeypatch.setenv("HTTPS_PROXY", "http://env.proxy:8080")
     proxy, source = resolve_proxy("http://explicit.proxy:9000")
     assert proxy == "http://explicit.proxy:9000"
     assert source == "explicit"
 
 
-def test_resolve_proxy_uses_env_when_present(monkeypatch) -> None:
-    monkeypatch.setenv("HTTPS_PROXY", "http://env.proxy:8080")
+def test_resolve_proxy_is_opt_in(monkeypatch) -> None:
     proxy, source = resolve_proxy(None)
-    assert proxy == "http://env.proxy:8080"
-    assert source == "env"
-
-
-def test_proxy_from_macos_system_parses_https(monkeypatch) -> None:
-    monkeypatch.setattr("bub.channels.utils.platform.system", lambda: "Darwin")
-
-    class _Result:
-        returncode = 0
-        stdout = "HTTPSEnable : 1\nHTTPSProxy : 127.0.0.1\nHTTPSPort : 7890\n"
-
-    monkeypatch.setattr("bub.channels.utils.subprocess.run", lambda *_, **__: _Result())
-    assert _proxy_from_macos_system() == "http://127.0.0.1:7890"
+    assert proxy is None
+    assert source == "none"