On 404 from ZFS upload, mark attachment item for upload

This shouldn't happen, but reported here:

https://forums.zotero.org/discussion/64386/5-0-beta-persistent-sync-errors

Possibly the same cause as this:

https://forums.zotero.org/discussion/64438/5-0-beta-persistent-sync-error

chrome/content/zotero/xpcom/storage/zfs.js

@@ -476,13 +476,14 @@ Zotero.Sync.Storage.Mode.ZFS.prototype = {
 			);
 			throw e;
 		}
+		// This shouldn't happen, but if it does, mark item for upload and restart sync
 		else if (req.status == 404) {
-			Components.utils.reportError("Unexpected status code 404 in upload authorization "
+			Zotero.logError(`Item ${item.libraryID}/${item.key} not found in upload authorization `
-				+ "request (" + item.libraryKey + ")");
+				+ 'request -- marking for upload');
-			
+			yield Zotero.Sync.Data.Local.markObjectAsUnsynced(item);
-			// TODO: Make an API request to fix this
+			return new Zotero.Sync.Storage.Result({
-			
+				syncRequired: true
-			throw new Error(Zotero.Sync.Storage.defaultError);
+			});
 		}
 		else if (req.status == 412) {
 			let version = req.getResponseHeader('Last-Modified-Version');

test/tests/zfsTest.js

@@ -132,7 +132,7 @@ describe("Zotero.Sync.Storage.Mode.ZFS", function () {
 			assert.equal(library.storageVersion, library.libraryVersion);
 		})
 		
-		it("should ignore a remotely missing file", function* () {
+		it("should ignore download for a remotely missing file", function* () {
 			var { engine, client, caller } = yield setup();
 			
 			var library = Zotero.Libraries.userLibrary;
@@ -758,6 +758,42 @@ describe("Zotero.Sync.Storage.Mode.ZFS", function () {
 	
 	
 	describe("#_processUploadFile()", function () {
+		it("should handle 404 from upload authorization request", function* () {
+			var { engine, client, caller } = yield setup();
+			var zfs = new Zotero.Sync.Storage.Mode.ZFS({
+				apiClient: client
+			})
+			
+			var filePath = OS.Path.join(getTestDataDirectory().path, 'test.png');
+			var item = yield Zotero.Attachments.importFromFile({ file: filePath });
+			item.version = 5;
+			item.synced = true;
+			yield item.saveTx();
+			
+			var itemJSON = item.toResponseJSON();
+			itemJSON.data.mtime = yield item.attachmentModificationTime;
+			itemJSON.data.md5 = yield item.attachmentHash;
+			
+			server.respond(function (req) {
+				if (req.method == "POST"
+						&& req.url == `${baseURL}users/1/items/${item.key}/file`
+						&& !req.requestBody.includes('upload=')) {
+					req.respond(
+						404,
+						{
+							"Last-Modified-Version": 5
+						},
+						"Not Found"
+					);
+				}
+			})
+			
+			var result = yield zfs._processUploadFile({
+				name: item.libraryKey
+			});
+			assert.isTrue(result.syncRequired);
+		});
+		
 		it("should handle 412 with matching version and hash matching local file", function* () {
 			var { engine, client, caller } = yield setup();
 			var zfs = new Zotero.Sync.Storage.Mode.ZFS({