Added download param to getFile api call

web/react/components/view_image.jsx

@@ -211,7 +211,7 @@ export default class ViewImageModal extends React.Component {
         }
 
         const filename = this.props.filenames[this.state.imgId];
-        const fileUrl = Utils.getFileUrl(filename);
+        const fileUrl = Utils.getFileUrl(filename, true);
 
         var content;
         if (this.state.loaded[this.state.imgId]) {
@@ -377,6 +377,7 @@ function ImagePreview({filename, fileUrl, fileInfo, maxHeight}) {
         <a
             href={fileUrl}
             target='_blank'
+            download={true}
         >
             <img
                 style={{maxHeight}}

web/react/utils/utils.jsx

@@ -1091,8 +1091,9 @@ export function fileSizeToString(bytes) {
 }
 
 // Converts a filename (like those attached to Post objects) to a url that can be used to retrieve attachments from the server.
-export function getFileUrl(filename) {
-    return getWindowLocationOrigin() + '/api/v1/files/get' + filename + '?' + getSessionIndex();
+export function getFileUrl(filename, isDownload) {
+    const downloadParam = isDownload ? '&download=1' : '';
+    return getWindowLocationOrigin() + '/api/v1/files/get' + filename + '?' + getSessionIndex() + downloadParam;
 }
 
 // Gets the name of a file (including extension) from a given url or file path.