Add support for exporting .torrent from WebUI

PR #16968.

src/webui/api/apicontroller.cpp

@@ -91,3 +91,8 @@ void APIController::setResult(const QJsonObject &result)
 {
     m_result = QJsonDocument(result);
 }
+
+void APIController::setResult(const QByteArray &result)
+{
+    m_result = result;
+}

src/webui/api/apicontroller.h

@@ -55,6 +55,7 @@ protected:
     void setResult(const QString &result);
     void setResult(const QJsonArray &result);
     void setResult(const QJsonObject &result);
+    void setResult(const QByteArray &result);
 
 private:
     StringMap m_params;

src/webui/api/torrentscontroller.cpp

@@ -1414,3 +1414,19 @@ void TorrentsController::renameFolderAction()
         throw APIError(APIErrorType::Conflict, error.message());
     }
 }
+
+void TorrentsController::exportAction()
+{
+    requireParams({u"hash"_qs});
+
+    const auto id = BitTorrent::TorrentID::fromString(params()[u"hash"_qs]);
+    const BitTorrent::Torrent *const torrent = BitTorrent::Session::instance()->findTorrent(id);
+    if (!torrent)
+        throw APIError(APIErrorType::NotFound);
+
+    const nonstd::expected<QByteArray, QString> result = torrent->exportToBuffer();
+    if (!result)
+        throw APIError(APIErrorType::Conflict, tr("Unable to export torrent file. Error: %1").arg(result.error()));
+
+    setResult(result.value());
+}

src/webui/api/torrentscontroller.h

@@ -87,4 +87,5 @@ private slots:
     void toggleFirstLastPiecePrioAction();
     void renameFileAction();
     void renameFolderAction();
+    void exportAction();
 };

src/webui/webapplication.cpp

@@ -278,6 +278,9 @@ void WebApplication::doProcessRequest()
         case QMetaType::QJsonDocument:
             print(result.toJsonDocument().toJson(QJsonDocument::Compact), Http::CONTENT_TYPE_JSON);
             break;
+        case QMetaType::QByteArray:
+            print(result.toByteArray(), Http::CONTENT_TYPE_TXT);
+            break;
         case QMetaType::QString:
         default:
             print(result.toString(), Http::CONTENT_TYPE_TXT);

src/webui/webapplication.h

@@ -48,7 +48,7 @@
 #include "base/utils/version.h"
 #include "api/isessionmanager.h"
 
-inline const Utils::Version<int, 3, 2> API_VERSION {2, 8, 10};
+inline const Utils::Version<int, 3, 2> API_VERSION {2, 8, 11};
 
 class APIController;
 class AuthController;

src/webui/www/private/index.html

@@ -174,6 +174,9 @@
                 <li><a href="#" id="copyID" class="copyToClipboard"><img src="icons/edit-copy.svg" alt="QBT_TR(Torrent ID)QBT_TR[CONTEXT=TransferListWidget]" /> QBT_TR(Torrent ID)QBT_TR[CONTEXT=TransferListWidget]</a></li>
             </ul>
         </li>
+        <li>
+            <a href="#exportTorrent"><img src="icons/edit-copy.svg" alt="QBT_TR(Export .torrent)QBT_TR[CONTEXT=TransferListWidget]" /> QBT_TR(Export .torrent)QBT_TR[CONTEXT=TransferListWidget]</a>
+        </li>
     </ul>
     <ul id="categoriesFilterMenu" class="contextMenu">
         <li><a href="#createCategory"><img src="icons/list-add.svg" alt="QBT_TR(Add category...)QBT_TR[CONTEXT=CategoryFilterWidget]" /> QBT_TR(Add category...)QBT_TR[CONTEXT=CategoryFilterWidget]</a></li>

src/webui/www/private/scripts/mocha-init.js

@@ -88,6 +88,7 @@ let copyInfohashFN = function(policy) {};
 let copyMagnetLinkFN = function() {};
 let copyIdFN = function() {};
 let setQueuePositionFN = function() {};
+let exportTorrentFN = function() {};
 
 const initializeWindows = function() {
     saveWindowSize = function(windowId) {
@@ -957,6 +958,26 @@ const initializeWindows = function() {
         return torrentsTable.selectedRowsIds().join("\n");
     };
 
+    exportTorrentFN = function() {
+        const hashes = torrentsTable.selectedRowsIds();
+        for (const hash of hashes) {
+            const row = torrentsTable.rows.get(hash);
+            if (!row) return
+
+            const name = row.full_data.name;
+            const url = new URI("api/v2/torrents/export");
+            url.setData("hash", hash);
+
+            // download response to file
+            const element = document.createElement("a");
+            element.setAttribute("href", url);
+            element.setAttribute("download", name + ".torrent");
+            document.body.appendChild(element);
+            element.click();
+            document.body.removeChild(element);
+        }
+    };
+
     ['pause', 'resume'].each(function(item) {
         addClickEvent(item + 'All', function(e) {
             new Event(e).stop();

src/webui/www/private/views/transferlist.html

@@ -97,6 +97,10 @@
 
                 superSeeding: function(element, ref) {
                     setSuperSeedingFN(!ref.getItemChecked('superSeeding'));
+                },
+
+                exportTorrent: function(element, ref) {
+                    exportTorrentFN();
                 }
             },
             offsets: {