fix: fixed download error for some formats. a separate method has bee…

…n allocated for obtaining mime type by format name

controller/editorcontroller.php

@@ -1274,9 +1274,9 @@ public function download($fileId, $toExtension = null, $template = false) {
 		$fileNameWithoutExt = substr($fileName, 0, \strlen($fileName) - \strlen($ext) - 1);
 		$newFileName = $fileNameWithoutExt . "." . $toExtension;
 
-		$formats = $this->config->formatsSetting();
+		$mimeType = $this->config->getMimeType($toExtension);
 
-		return new DataDownloadResponse($newData, $newFileName, $formats[$toExtension]["mime"][0]);
+		return new DataDownloadResponse($newData, $newFileName, $mimeType);
 	}
 
 	/**

lib/appconfig.php

@@ -1391,6 +1391,27 @@ public function getFormats() {
 		return json_decode($formats, true);
 	}
 
+	/**
+	 * Get the mime type by format name
+	 *
+	 * @param string $ext - format name
+	 *
+	 * @return string
+	 */
+	public function getMimeType($ext) {
+		$onlyofficeFormats = $this->getFormats();
+		$result = "text/plain";
+
+		foreach ($onlyofficeFormats as $onlyOfficeFormat) {
+			if ($onlyOfficeFormat["name"] === $ext && !empty($onlyOfficeFormat["mime"])) {
+				$result = $onlyOfficeFormat["mime"][0];
+				break;
+			}
+		}
+
+		return $result;
+	}
+
 	/**
 	 * DEMO DATA
 	 */