Add HTTP & SOCKS5 proxy support (#4321)

This can be configured using the `CHATTERINO2_PROXY_URL` environment variable.
The behaviour is similar to curl's CURLOPT_PROXY

src/common/Env.cpp

@@ -44,6 +44,17 @@ namespace {
         return defaultValue;
     }
 
+    boost::optional<QString> readOptionalStringEnv(const char *envName)
+    {
+        auto envString = std::getenv(envName);
+        if (envString != nullptr)
+        {
+            return QString(envString);
+        }
+
+        return boost::none;
+    }
+
     uint16_t readPortEnv(const char *envName, uint16_t defaultValue)
     {
         auto envString = std::getenv(envName);
@@ -89,6 +100,7 @@ Env::Env()
           readStringEnv("CHATTERINO2_TWITCH_SERVER_HOST", "irc.chat.twitch.tv"))
     , twitchServerPort(readPortEnv("CHATTERINO2_TWITCH_SERVER_PORT", 443))
     , twitchServerSecure(readBoolEnv("CHATTERINO2_TWITCH_SERVER_SECURE", true))
+    , proxyUrl(readOptionalStringEnv("CHATTERINO2_PROXY_URL"))
 {
 }
 

src/common/Env.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <boost/optional.hpp>
 #include <QString>
 
 namespace chatterino {
@@ -16,6 +17,7 @@ public:
     const QString twitchServerHost;
     const uint16_t twitchServerPort;
     const bool twitchServerSecure;
+    const boost::optional<QString> proxyUrl;
 };
 
 }  // namespace chatterino

src/common/QLogging.cpp

@@ -28,6 +28,7 @@ Q_LOGGING_CATEGORY(chatterinoMain, "chatterino.main", logThreshold);
 Q_LOGGING_CATEGORY(chatterinoMessage, "chatterino.message", logThreshold);
 Q_LOGGING_CATEGORY(chatterinoNativeMessage, "chatterino.nativemessage",
                    logThreshold);
+Q_LOGGING_CATEGORY(chatterinoNetwork, "chatterino.network", logThreshold);
 Q_LOGGING_CATEGORY(chatterinoNotification, "chatterino.notification",
                    logThreshold);
 Q_LOGGING_CATEGORY(chatterinoNuulsuploader, "chatterino.nuulsuploader",

src/common/QLogging.hpp

@@ -22,6 +22,7 @@ Q_DECLARE_LOGGING_CATEGORY(chatterinoLiveupdates);
 Q_DECLARE_LOGGING_CATEGORY(chatterinoMain);
 Q_DECLARE_LOGGING_CATEGORY(chatterinoMessage);
 Q_DECLARE_LOGGING_CATEGORY(chatterinoNativeMessage);
+Q_DECLARE_LOGGING_CATEGORY(chatterinoNetwork);
 Q_DECLARE_LOGGING_CATEGORY(chatterinoNotification);
 Q_DECLARE_LOGGING_CATEGORY(chatterinoNuulsuploader);
 Q_DECLARE_LOGGING_CATEGORY(chatterinoPubSub);