Support the http_proxy environment variable

Overrides General.proxy setting if set

docs/CHANGELOG.md

@@ -61,6 +61,9 @@ and this project adheres to
 - Add command-line arguments parsing and a `--start-in-tray` option, see 
   `mirage --help`
 
+- Support for HTTP and SOCKS5 proxies, can be set in config file or using the
+  `http_proxy` environment variable
+
 - Hovering on stability percentages in the sign-in page's homeserver list 
   now shows more detailed tooltips about the server's recent downtimes
 

src/backend/matrix_client.py

@@ -7,6 +7,7 @@ import asyncio
 import html
 import io
 import logging as log
+import os
 import platform
 import re
 import textwrap
@@ -167,7 +168,8 @@ class MatrixClient(nio.AsyncClient):
         store = Path(backend.appdirs.user_data_dir) / "encryption"
         store.mkdir(parents=True, exist_ok=True)
 
-        proxy = backend.settings.General.proxy
+        proxy: Optional[str]
+        proxy = os.environ.get("http_proxy", backend.settings.General.proxy)
         host  = re.sub(r":\d+$", "", urlparse(homeserver).netloc)
 
         if host in ("127.0.0.1", "localhost", "::1"):

src/gui/ArgumentParser.qml

@@ -21,6 +21,7 @@ QtObject {
         MIRAGE_CONFIG_DIR  Override the default configuration folder
         MIRAGE_DATA_DIR    Override the default application data folder
         MIRAGE_CACHE_DIR   Override the default cache and downloads folder
+        http_proxy         Override the General.proxy setting, see settings.py
     `
 
     readonly property bool ready: {

src/utils.h

@@ -12,7 +12,7 @@
 #include <QObject>
 #include <QUuid>
 #include <QNetworkProxy>
-#include <QDebug>
+#include <QUrl>
 #include <QDebug>
 
 #ifdef Q_OS_LINUX
@@ -92,6 +92,8 @@ public slots:
     }
 
     void setProxy(QUrl url) const {
+        const QUrl envProxy = QUrl(qEnvironmentVariable("http_proxy"));
+        if (! envProxy.isEmpty()) url = envProxy;
         if (url.isEmpty()) return;
 
         const QString scheme = url.scheme();