feat: add /warn command (#5474)

src/providers/twitch/api/Helix.hpp

@@ -621,6 +621,18 @@ enum class HelixBanUserError {  // /timeout, /ban
     Forwarded,
 };  // /timeout, /ban
 
+enum class HelixWarnUserError {  // /warn
+    Unknown,
+    UserMissingScope,
+    UserNotAuthorized,
+    Ratelimited,
+    ConflictingOperation,
+    CannotWarnUser,
+
+    // The error message is forwarded directly from the Twitch API
+    Forwarded,
+};  // /warn
+
 enum class HelixWhisperError {  // /w
     Unknown,
     UserMissingScope,
@@ -1024,6 +1036,13 @@ public:
         ResultCallback<> successCallback,
         FailureCallback<HelixBanUserError, QString> failureCallback) = 0;
 
+    // Warn a user
+    // https://dev.twitch.tv/docs/api/reference#warn-chat-user
+    virtual void warnUser(
+        QString broadcasterID, QString moderatorID, QString userID,
+        QString reason, ResultCallback<> successCallback,
+        FailureCallback<HelixWarnUserError, QString> failureCallback) = 0;
+
     // Send a whisper
     // https://dev.twitch.tv/docs/api/reference#send-whisper
     virtual void sendWhisper(
@@ -1346,6 +1365,13 @@ public:
         ResultCallback<> successCallback,
         FailureCallback<HelixBanUserError, QString> failureCallback) final;
 
+    // Warn a user
+    // https://dev.twitch.tv/docs/api/reference#warn-chat-user
+    void warnUser(
+        QString broadcasterID, QString moderatorID, QString userID,
+        QString reason, ResultCallback<> successCallback,
+        FailureCallback<HelixWarnUserError, QString> failureCallback) final;
+
     // Send a whisper
     // https://dev.twitch.tv/docs/api/reference#send-whisper
     void sendWhisper(