Add cookies.txt authentication support

tests/test_auth.py

@@ -83,6 +83,45 @@ def test_extract_cookies_from_jar_logs_missing_required_cookies(caplog) -> None:
     assert "ct0=False" in caplog.text
 
 
+def test_load_from_cookie_file_parses_netscape_cookie_dump(tmp_path) -> None:
+    cookie_file = tmp_path / "cookies.txt"
+    cookie_file.write_text(
+        "# Netscape HTTP Cookie File\n"
+        ".x.com\tTRUE\t/\tTRUE\t0\tguest_id\tv1%3A123\n"
+        ".x.com\tTRUE\t/\tTRUE\t0\tct0\tcsrf-token\n"
+        ".x.com\tTRUE\t/\tTRUE\t0\tauth_token\tauth-token\n",
+        encoding="utf-8",
+    )
+
+    cookies = auth.load_from_cookie_file(str(cookie_file))
+
+    assert cookies is not None
+    assert cookies["auth_token"] == "auth-token"
+    assert cookies["ct0"] == "csrf-token"
+    assert "guest_id=v1%3A123" in cookies["cookie_string"]
+
+
+def test_get_cookies_uses_cookie_file_before_browser(monkeypatch) -> None:
+    monkeypatch.setattr(auth, "load_from_env", lambda: None)
+    monkeypatch.setattr(
+        auth,
+        "load_from_cookie_file",
+        lambda path: {"auth_token": "file-token", "ct0": "file-csrf", "cookie_string": "a=1"},
+    )
+    monkeypatch.setattr(auth, "extract_from_browser", lambda: pytest.fail("should not extract from browser"))
+    seen = []
+    monkeypatch.setattr(
+        auth,
+        "verify_cookies",
+        lambda auth_token, ct0, cookie_string=None: seen.append((auth_token, ct0, cookie_string)) or {},
+    )
+
+    cookies = auth.get_cookies({"auth": {"cookieFile": "/tmp/cookies.txt"}})
+
+    assert cookies["auth_token"] == "file-token"
+    assert seen == [("file-token", "file-csrf", "a=1")]
+
+
 def test_extract_from_browser_logs_warning_when_all_methods_fail(monkeypatch, caplog) -> None:
     monkeypatch.setattr(auth, "_extract_in_process", lambda: (None, []))
     monkeypatch.setattr(auth, "_extract_via_subprocess", lambda: (None, []))