use attachment name when we have one for file saving

ts/test/types/Attachment_test.ts

@@ -47,7 +47,7 @@ describe('Attachment', () => {
           contentType: MIME.VIDEO_QUICKTIME,
         };
         const actual = Attachment.getSuggestedFilename({ attachment });
-        const expected = 'session-attachment.mov';
+        const expected = 'funny-cat.mov';
         assert.strictEqual(actual, expected);
       });
       it('should generate a filename without timestamp but with an index', () => {
@@ -60,7 +60,7 @@ describe('Attachment', () => {
           attachment,
           index: 3,
         });
-        const expected = 'session-attachment_003.mov';
+        const expected = 'funny-cat.mov';
         assert.strictEqual(actual, expected);
       });
       it('should generate a filename with an extension if contentType is not setup', () => {
@@ -73,7 +73,7 @@ describe('Attachment', () => {
           attachment,
           index: 3,
         });
-        const expected = 'session-attachment_003.ini';
+        const expected = 'funny-cat.ini';
         assert.strictEqual(actual, expected);
       });
 
@@ -87,7 +87,7 @@ describe('Attachment', () => {
           attachment,
           index: 3,
         });
-        const expected = 'session-attachment_003.txt';
+        const expected = 'funny-cat.txt';
         assert.strictEqual(actual, expected);
       });
       it('should generate a filename with an extension if contentType is json', () => {
@@ -100,7 +100,7 @@ describe('Attachment', () => {
           attachment,
           index: 3,
         });
-        const expected = 'session-attachment_003.json';
+        const expected = 'funny-cat.json';
         assert.strictEqual(actual, expected);
       });
     });
@@ -116,14 +116,14 @@ describe('Attachment', () => {
           attachment,
           timestamp,
         });
-        const expected = 'session-attachment-2000-01-01-000000.mov';
+        const expected = 'funny-cat.mov';
         assert.strictEqual(actual, expected);
       });
     });
     context('for attachment with index', () => {
-      it('should generate a filename based on timestamp', () => {
+      it('should generate a filename based on timestamp if filename is not set', () => {
         const attachment: Attachment.AttachmentType = {
-          fileName: 'funny-cat.mov',
+          fileName: '',
           url: 'funny-cat.mov',
           contentType: MIME.VIDEO_QUICKTIME,
         };
@@ -136,6 +136,22 @@ describe('Attachment', () => {
         const expected = 'session-attachment-1970-01-01-000000_003.mov';
         assert.strictEqual(actual, expected);
       });
+
+      it('should generate a filename based on filename if present', () => {
+        const attachment: Attachment.AttachmentType = {
+          fileName: 'funny-cat.mov',
+          url: 'funny-cat.mov',
+          contentType: MIME.VIDEO_QUICKTIME,
+        };
+        const timestamp = new Date(new Date(0).getTimezoneOffset() * 60 * 1000);
+        const actual = Attachment.getSuggestedFilename({
+          attachment,
+          timestamp,
+          index: 3,
+        });
+        const expected = 'funny-cat.mov';
+        assert.strictEqual(actual, expected);
+      });
     });
   });
 

ts/types/Attachment.ts

@@ -334,6 +334,9 @@ export const getSuggestedFilename = ({
   timestamp?: number | Date;
   index?: number;
 }): string => {
+  if (attachment.fileName?.length > 3) {
+    return attachment.fileName;
+  }
   const prefix = 'session-attachment';
   const suffix = timestamp ? moment(timestamp).format('-YYYY-MM-DD-HHmmss') : '';
   const fileType = getFileExtension(attachment);