Initial better mod browser link implementation

Signed-off-by: TheKodeToad <TheKodeToad@proton.me>

launcher/ui/dialogs/ModDownloadDialog.cpp

@@ -187,3 +187,8 @@ void ModDownloadDialog::selectedPageChanged(BasePage* previous, BasePage* select
     // Same effect as having a global search bar
     selected_page->setSearchTerm(prev_page->getSearchTerm());
 }
+
+bool ModDownloadDialog::selectPage(QString pageId)
+{
+    return m_container->selectPage(pageId);
+}

launcher/ui/dialogs/ModDownloadDialog.h

@@ -53,6 +53,8 @@ public:
     const QList<ModDownloadTask*> getTasks();
     const std::shared_ptr<ModFolderModel> &mods;
 
+    bool selectPage(QString pageId);
+
 public slots:
     void confirm();
     void accept() override;

launcher/ui/pages/modplatform/ModPage.cpp

@@ -2,6 +2,7 @@
 /*
  *  PolyMC - Minecraft Launcher
  *  Copyright (C) 2022 Sefa Eyeoglu <contact@scrumplex.net>
+ *  Copyright (C) 2022 TheKodeToad <TheKodeToad@proton.me>
  *
  *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -37,6 +38,7 @@
 #include "Application.h"
 #include "ui_ModPage.h"
 
+#include <QDesktopServices>
 #include <QKeyEvent>
 #include <memory>
 
@@ -80,6 +82,8 @@ ModPage::ModPage(ModDownloadDialog* dialog, BaseInstance* instance, ModAPI* api)
 
     ui->packView->setItemDelegate(new ProjectItemDelegate(this));
     ui->packView->installEventFilter(this);
+
+    connect(ui->packDescription, &QTextBrowser::anchorClicked, this, &ModPage::openUrl);
 }
 
 ModPage::~ModPage()
@@ -241,6 +245,54 @@ void ModPage::onModSelected()
     ui->packView->adjustSize();
 }
 
+void ModPage::openUrl(const QUrl& url)
+{
+    // do not allow other url schemes for security reasons
+    if (!(url.scheme() == "http" || url.scheme() == "https")) {
+        qWarning() << "Unsupported scheme" << url.scheme();
+        return;
+    }
+
+    // detect mod URLs and search instead
+    int prefixLength;
+    const char* page;
+
+    if ((url.host() == "modrinth.com" || url.host() == "www.modrinth.com")
+            && url.path().startsWith("/mod/")) {
+        prefixLength = 5;
+        page = "modrinth";
+    }
+    else if (APPLICATION->capabilities() & Application::SupportsFlame
+            && url.host() == "www.curseforge.com"
+            && url.path().toLower().startsWith("/minecraft/mc-mods/")) {
+        prefixLength = 19;
+        page = "curseforge";
+    }
+    else
+        prefixLength = 0;
+
+    if (prefixLength != 0) {
+        QString slug = url.path().mid(prefixLength);
+
+        // remove trailing slash(es)
+        while (slug.endsWith('/'))
+            slug.remove(slug.length() - 1, 1);
+
+        // ensure that the path doesn't contain any further slashes,
+        // and the user isn't opening the same mod; they probably
+        // intended to view in their web browser
+        if (!slug.isEmpty() && !slug.contains('/') && slug != current.slug) {
+            ui->searchEdit->setText(slug);
+            dialog->selectPage(page);
+            triggerSearch();
+            return;
+        }
+    }
+
+    // open in the user's web browser
+    QDesktopServices::openUrl(url);
+}
+
 
 /******** Make changes to the UI ********/
 
@@ -317,7 +369,6 @@ void ModPage::updateUi()
         text += "<br>" + tr(" by ") + authorStrs.join(", ");
     }
 
-    
     if (current.extraDataLoaded) {
         if (!current.extraData.donate.isEmpty()) {
             text += "<br><br>" + tr("Donate information: ");

launcher/ui/pages/modplatform/ModPage.h

@@ -82,6 +82,7 @@ class ModPage : public QWidget, public BasePage {
     void onSelectionChanged(QModelIndex first, QModelIndex second);
     void onVersionSelectionChanged(QString data);
     void onModSelected();
+    virtual void openUrl(const QUrl& url);
 
    protected:
     Ui::ModPage* ui = nullptr;

launcher/ui/pages/modplatform/ModPage.ui

@@ -16,10 +16,10 @@
      <item row="1" column="2">
       <widget class="ProjectDescriptionPage" name="packDescription">
        <property name="openExternalLinks">
-        <bool>true</bool>
+        <bool>false</bool>
        </property>
        <property name="openLinks">
-        <bool>true</bool>
+        <bool>false</bool>
        </property>
       </widget>
      </item>

launcher/ui/pages/modplatform/flame/FlameModPage.cpp

@@ -78,3 +78,18 @@ bool FlameModPage::optedOut(ModPlatform::IndexedVersion& ver) const
 // other mod providers start loading before being selected, at least with
 // my Qt, so we need to implement this in every derived class...
 auto FlameModPage::shouldDisplay() const -> bool { return true; }
+
+void FlameModPage::openUrl(const QUrl& url)
+{
+    if (url.scheme().isEmpty()) {
+        QString query = url.query(QUrl::FullyDecoded);
+        if (query.startsWith("remoteUrl=")) {
+            // attempt to resolve url from warning page
+            query.remove(0, 10);
+            ModPage::openUrl({QUrl::fromPercentEncoding(query.toUtf8())}); // double decoding is necessary
+            return;
+        }
+    }
+
+    ModPage::openUrl(url);
+}

launcher/ui/pages/modplatform/flame/FlameModPage.h

@@ -64,4 +64,6 @@ class FlameModPage : public ModPage {
     bool optedOut(ModPlatform::IndexedVersion& ver) const override;
 
     auto shouldDisplay() const -> bool override;
+
+    void openUrl(const QUrl& url) override;
 };