allow customizing twitch server parameters through environment variables (#1449)

docs/ENV.md

@@ -18,3 +18,17 @@ Used to change the URL that Chatterino2 uses when trying to get emote set inform
 Default value: `https://braize.pajlada.com/chatterino/twitchemotes/set/%1/`  
 Arguments:  
  - `%1` = Emote set ID
+
+### CHATTERINO2_TWITCH_SERVER_HOST
+String value used to change what Twitch chat server host to connect to.  
+Default value: `irc.chat.twitch.tv`
+
+### CHATTERINO2_TWITCH_SERVER_PORT
+Number value used to change what port to use when connecting to Twitch chat servers.  
+Currently known valid ports for secure usage: 6697, 443.  
+Currently known valid ports for non-secure usage (CHATTERINO2_TWITCH_SERVER_SECURE set to false): 6667, 80.  
+Default value: `443`
+
+### CHATTERINO2_TWITCH_SERVER_SECURE
+Bool value used to tell Chatterino whether to try to connect securely (secure irc) to the Twitch chat server.  
+Default value: `true`

src/common/Env.cpp

@@ -1,5 +1,7 @@
 #include "common/Env.hpp"
 
+#include <QVariant>
+
 namespace chatterino {
 
 namespace {
@@ -15,6 +17,33 @@ namespace {
         return defaultValue;
     }
 
+    uint16_t readPortEnv(const char *envName, uint16_t defaultValue)
+    {
+        auto envString = std::getenv(envName);
+        if (envString != nullptr)
+        {
+            bool ok;
+            auto val = QString(envString).toUShort(&ok);
+            if (ok)
+            {
+                return val;
+            }
+        }
+
+        return defaultValue;
+    }
+
+    uint16_t readBoolEnv(const char *envName, bool defaultValue)
+    {
+        auto envString = std::getenv(envName);
+        if (envString != nullptr)
+        {
+            return QVariant(QString(envString)).toBool();
+        }
+
+        return defaultValue;
+    }
+
 }  // namespace
 
 Env::Env()
@@ -28,6 +57,10 @@ Env::Env()
     , twitchEmoteSetResolverUrl(readStringEnv(
           "CHATTERINO2_TWITCH_EMOTE_SET_RESOLVER_URL",
           "https://braize.pajlada.com/chatterino/twitchemotes/set/%1/"))
+    , twitchServerHost(
+          readStringEnv("CHATTERINO2_TWITCH_SERVER_HOST", "irc.chat.twitch.tv"))
+    , twitchServerPort(readPortEnv("CHATTERINO2_TWITCH_SERVER_PORT", 6697))
+    , twitchServerSecure(readBoolEnv("CHATTERINO2_TWITCH_SERVER_SECURE", true))
 {
 }
 

src/common/Env.hpp

@@ -14,6 +14,9 @@ public:
     const QString recentMessagesApiUrl;
     const QString linkResolverUrl;
     const QString twitchEmoteSetResolverUrl;
+    const QString twitchServerHost;
+    const uint16_t twitchServerPort;
+    const bool twitchServerSecure;
 };
 
 }  // namespace chatterino

src/providers/twitch/TwitchIrcServer.cpp

@@ -5,6 +5,7 @@
 
 #include "Application.hpp"
 #include "common/Common.hpp"
+#include "common/Env.hpp"
 #include "controllers/accounts/AccountController.hpp"
 #include "controllers/highlights/HighlightController.hpp"
 #include "messages/Message.hpp"
@@ -86,13 +87,12 @@ void TwitchIrcServer::initializeConnection(IrcConnection *connection,
         connection->setPassword(oauthToken);
     }
 
-    connection->setSecure(true);
-
     // https://dev.twitch.tv/docs/irc/guide/#connecting-to-twitch-irc
     // SSL disabled: irc://irc.chat.twitch.tv:6667 (or port 80)
     // SSL enabled: irc://irc.chat.twitch.tv:6697 (or port 443)
-    connection->setHost("irc.chat.twitch.tv");
-    connection->setPort(443);
+    connection->setHost(Env::get().twitchServerHost);
+    connection->setPort(Env::get().twitchServerPort);
+    connection->setSecure(Env::get().twitchServerSecure);
 
     this->open(type);
 }