Added tooltip to links via BTTV API.

src/providers/bttv/BttvTooltip.cpp

@@ -0,0 +1,39 @@
+#include "providers/bttv/BttvTooltip.hpp"
+
+#include "common/Common.hpp"
+#include "common/NetworkRequest.hpp"
+
+#include <QString>
+
+namespace chatterino {
+
+void BttvTooltip::getUrlTooltip(const QString url,
+                           std::function<void(QString)> successCallback)
+{
+    QString requestUrl("https://api.betterttv.net/2/link_resolver/" + 
+        QUrl::toPercentEncoding(url, "", "/:"));
+
+    NetworkRequest request(requestUrl);
+    request.setCaller(QThread::currentThread());
+    request.setTimeout(30000);
+    request.onSuccess([successCallback](auto result) mutable -> Outcome {
+        auto root = result.parseJson();
+        /* When tooltip is not a string, in this case, 
+        onError runs before onSuccess, 
+        so there is no point in doing "if" condition. */
+        auto tooltip = root.value("tooltip").toString();
+        successCallback(QUrl::fromPercentEncoding(tooltip.toUtf8()));
+
+        return Success;
+    });
+
+    request.onError([successCallback](auto result) {
+        successCallback("No link info found");
+
+        return true;
+    });
+
+    request.execute();
+}
+
+}  // namespace chatterino

src/providers/bttv/BttvTooltip.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <QString>
+#include <functional>
+
+namespace chatterino {
+
+class BttvTooltip
+{
+public:
+    static void getUrlTooltip(const QString url,
+                           std::function<void(QString)> callback);
+
+private:
+};
+
+}  // namespace chatterino

src/providers/twitch/TwitchMessageBuilder.cpp

@@ -8,6 +8,7 @@
 #include "messages/Message.hpp"
 #include "providers/twitch/TwitchBadges.hpp"
 #include "providers/twitch/TwitchChannel.hpp"
+#include "providers/bttv/BttvTooltip.hpp"
 #include "singletons/Emotes.hpp"
 #include "singletons/Resources.hpp"
 #include "singletons/Settings.hpp"
@@ -268,12 +269,19 @@ void TwitchMessageBuilder::addTextOrEmoji(const QString &string_)
         link = Link(Link::Url, linkString);
 
         textColor = MessageColor(MessageColor::Link);
-        this->emplace<TextElement>(lowercaseLinkString,
+        auto linkMessageElement = this->emplace<TextElement>(lowercaseLinkString,
                                    MessageElementFlag::LowercaseLink, textColor)
             ->setLink(link);
         this->emplace<TextElement>(string, MessageElementFlag::OriginalLink,
                                    textColor)
             ->setLink(link);
+
+        BttvTooltip::getUrlTooltip(
+            linkString, [linkMessageElement](QString tooltipText) {
+                if (!tooltipText.isEmpty()) {
+                    linkMessageElement->setTooltip(tooltipText);
+                }
+            });
     }
 
     // if (!linkString.isEmpty()) {