Update mediaName derivation to hex encoding

ts/Crypto.ts

@@ -271,7 +271,7 @@ export function deriveMediaIdFromMediaName(
     BACKUP_MEDIA_ID_LEN,
     Buffer.from(backupKey),
     Buffer.from(BACKUP_MEDIA_ID_INFO),
-    Buffer.from(Bytes.fromBase64(mediaName))
+    Buffer.from(mediaName, 'utf8')
   );
 }
 

ts/services/backups/util/mediaId.ts

@@ -42,13 +42,13 @@ export function getMediaNameForAttachment(attachment: AttachmentType): string {
     return attachment.backupLocator.mediaName;
   }
   strictAssert(attachment.digest, 'Digest must be present');
-  return attachment.digest;
+  return Bytes.toHex(Bytes.fromBase64(attachment.digest));
 }
 
 export function getMediaNameForAttachmentThumbnail(
   fullsizeMediaName: string
 ): string {
-  return Bytes.toBase64(Bytes.fromString(`${fullsizeMediaName}_thumbnail`));
+  return `${fullsizeMediaName}_thumbnail`;
 }
 
 export function getBytesFromMediaIdString(mediaId: string): Uint8Array {

ts/test-electron/backup/attachments_test.ts

@@ -77,6 +77,10 @@ describe('backup/attachments', () => {
     return Bytes.toBase64(Bytes.fromString(str));
   }
 
+  function digestToMediaName(digestBase64: string): string {
+    return Bytes.toHex(Bytes.fromBase64(digestBase64));
+  }
+
   function composeAttachment(
     index: number,
     overrides?: Partial<AttachmentType>
@@ -169,7 +173,9 @@ describe('backup/attachments', () => {
                   'thumbnail',
                   'uploadTimestamp',
                 ]),
-                backupLocator: { mediaName: attachment.digest },
+                backupLocator: {
+                  mediaName: digestToMediaName(attachment.digest),
+                },
               },
             ],
           }),
@@ -201,7 +207,9 @@ describe('backup/attachments', () => {
                   'thumbnail',
                   'uploadTimestamp',
                 ]),
-                backupLocator: { mediaName: attachment.digest },
+                backupLocator: {
+                  mediaName: digestToMediaName(attachment.digest),
+                },
               },
             ],
           }),
@@ -271,7 +279,9 @@ describe('backup/attachments', () => {
                     'thumbnail',
                     'uploadTimestamp',
                   ]),
-                  backupLocator: { mediaName: attachment.digest },
+                  backupLocator: {
+                    mediaName: digestToMediaName(attachment.digest),
+                  },
                 },
               },
             ],
@@ -332,7 +342,9 @@ describe('backup/attachments', () => {
                       'thumbnail',
                       'uploadTimestamp',
                     ]),
-                    backupLocator: { mediaName: attachment.digest },
+                    backupLocator: {
+                      mediaName: digestToMediaName(attachment.digest),
+                    },
                   },
                   isProfile: false,
                 },
@@ -417,7 +429,9 @@ describe('backup/attachments', () => {
                       'uploadTimestamp',
                       'thumbnail',
                     ]),
-                    backupLocator: { mediaName: attachment.digest },
+                    backupLocator: {
+                      mediaName: digestToMediaName(attachment.digest),
+                    },
                   },
                   contentType: VIDEO_MP4,
                 },
@@ -468,7 +482,9 @@ describe('backup/attachments', () => {
                   'uploadTimestamp',
                   'thumbnail',
                 ]),
-                backupLocator: { mediaName: existingAttachment.digest },
+                backupLocator: {
+                  mediaName: digestToMediaName(existingAttachment.digest),
+                },
               },
             ],
           },
@@ -483,7 +499,9 @@ describe('backup/attachments', () => {
                   // been downloaded
                   thumbnail: {
                     ...omit(quoteAttachment, ['iv', 'path', 'uploadTimestamp']),
-                    backupLocator: { mediaName: quoteAttachment.digest },
+                    backupLocator: {
+                      mediaName: digestToMediaName(quoteAttachment.digest),
+                    },
                   },
                   contentType: VIDEO_MP4,
                 },
@@ -563,7 +581,7 @@ describe('backup/attachments', () => {
               key,
               digest,
               backupLocator: {
-                mediaName: digest,
+                mediaName: digestToMediaName(digest),
               },
             });
           },
@@ -635,7 +653,7 @@ describe('backup/attachments', () => {
                 key,
                 digest,
                 backupLocator: {
-                  mediaName: digest,
+                  mediaName: digestToMediaName(digest),
                 },
               });
             },
@@ -716,7 +734,9 @@ describe('backup/attachments', () => {
                     'thumbnail',
                     'uploadTimestamp',
                   ]),
-                  backupLocator: { mediaName: attachment.digest },
+                  backupLocator: {
+                    mediaName: digestToMediaName(attachment.digest),
+                  },
                 },
               },
             }),

ts/test-electron/backup/filePointer_test.ts

@@ -161,6 +161,9 @@ describe('convertFilePointerToAttachment', () => {
   });
 });
 
+const defaultDigest = Bytes.fromBase64('digest');
+const defaultMediaName = Bytes.toHex(defaultDigest);
+
 function composeAttachment(
   overrides: Partial<AttachmentType> = {}
 ): AttachmentType {
@@ -171,7 +174,7 @@ function composeAttachment(
     cdnNumber: 2,
     path: 'path/to/file.png',
     key: 'key',
-    digest: 'digest',
+    digest: Bytes.toBase64(defaultDigest),
     iv: 'iv',
     width: 100,
     height: 100,
@@ -202,17 +205,16 @@ const defaultAttachmentLocator = new Backups.FilePointer.AttachmentLocator({
   cdnKey: 'cdnKey',
   cdnNumber: 2,
   key: Bytes.fromBase64('key'),
-  digest: Bytes.fromBase64('digest'),
+  digest: defaultDigest,
   size: 100,
   uploadTimestamp: Long.fromNumber(1234),
 });
 
-const defaultMediaName = 'digest';
 const defaultBackupLocator = new Backups.FilePointer.BackupLocator({
   mediaName: defaultMediaName,
   cdnNumber: null,
   key: Bytes.fromBase64('key'),
-  digest: Bytes.fromBase64('digest'),
+  digest: defaultDigest,
   size: Long.fromNumber(100),
   transitCdnKey: 'cdnKey',
   transitCdnNumber: 2,
@@ -455,7 +457,7 @@ describe('getFilePointerForAttachment', () => {
                 ...defaultBackupLocator,
                 key: newKey,
                 digest: newDigest,
-                mediaName: Bytes.toBase64(newDigest),
+                mediaName: Bytes.toHex(newDigest),
                 transitCdnKey: undefined,
                 transitCdnNumber: undefined,
               }),
@@ -497,7 +499,7 @@ describe('getFilePointerForAttachment', () => {
                 ...defaultBackupLocator,
                 key: newKey,
                 digest: newDigest,
-                mediaName: Bytes.toBase64(newDigest),
+                mediaName: Bytes.toHex(newDigest),
                 transitCdnKey: undefined,
                 transitCdnNumber: undefined,
               }),
@@ -590,14 +592,14 @@ describe('getBackupJobForAttachmentAndFilePointer', async () => {
         getBackupCdnInfo: notInBackupCdn,
       }),
       {
-        mediaName: 'digest',
+        mediaName: Bytes.toHex(defaultDigest),
         receivedAt: 100,
         type: 'standard',
         data: {
           path: 'path/to/file.png',
           contentType: IMAGE_PNG,
           keys: 'key',
-          digest: 'digest',
+          digest: Bytes.toBase64(defaultDigest),
           iv: 'iv',
           size: 100,
           localKey: attachment.localKey,

ts/test-electron/services/AttachmentBackupManager_test.ts

@@ -343,9 +343,7 @@ describe('AttachmentBackupManager/JobManager', function attachmentBackupManager(
         jobForNonVisualAttachment
       );
 
-      const thumbnailMediaName = Bytes.toBase64(
-        Bytes.fromString(`${jobForVisualAttachment.mediaName}_thumbnail`)
-      );
+      const thumbnailMediaName = `${jobForVisualAttachment.mediaName}_thumbnail`;
       const allJobs = await getAllSavedJobs();
       assert.strictEqual(allJobs.length, 3);
       assert.sameMembers(