Add option to Mendeley importer to relink items

New option only appears if importer version is < 1 or not present.
It will:
    * Skip fetching collections and attachments
    * Skip any new items
    * Update relations on existing items

chrome/content/zotero/fileInterface.js

@@ -450,6 +450,7 @@ var Zotero_File_Interface = new function() {
 			translation.mendeleyAuth = options.mendeleyAuth;
 			translation.mendeleyCode = options.mendeleyCode;
 			translation.newItemsOnly = options.newItemsOnly;
+			translation.relinkOnly = options.relinkOnly;
 		}
 		else if (options.folder) {
 			Components.utils.import("chrome://zotero/content/import/folderImport.js");

chrome/content/zotero/import/importWizard.js

@@ -43,6 +43,7 @@ const Zotero_Import_Wizard = { // eslint-disable-line no-unused-vars
 	mendeleyAuth: null,
 	mendeleyCode: null,
 	mendeleyHasPreviouslyImported: false,
+	mendeleyImporterVersion: 0,
 	translation: null,
 	wizard: null,
 
@@ -72,6 +73,7 @@ const Zotero_Import_Wizard = { // eslint-disable-line no-unused-vars
 
 		const extensions = await Zotero.getInstalledExtensions();
 		this.isZotfileInstalled = !!extensions.find(extName => extName.match(/^ZotFile((?!disabled).)*$/));
+		this.mendeleyImporterVersion = parseInt((await Zotero.DB.valueQueryAsync("SELECT value FROM settings WHERE setting='mendeleyImport' AND key='version'")) || 0);
 
 		this.wizard = document.getElementById('import-wizard');
 		this.wizard.getPageById('page-start')
@@ -110,6 +112,8 @@ const Zotero_Import_Wizard = { // eslint-disable-line no-unused-vars
 			.getElementById('mendeley-username').addEventListener('keyup', this.onMendeleyAuthKeyUp.bind(this));
 		document
 			.getElementById('mendeley-password').addEventListener('keyup', this.onMendeleyAuthKeyUp.bind(this));
+		document
+			.getElementById('relink-only-checkbox').addEventListener('command', this.onRelinkOnlyChange.bind(this));
 
 		this.wizard.addEventListener('pageshow', this.updateFocus.bind(this));
 		this.wizard.addEventListener('wizardcancel', this.onCancel.bind(this));
@@ -301,6 +305,7 @@ const Zotero_Import_Wizard = { // eslint-disable-line no-unused-vars
 		document.getElementById('page-options-file-handling').style.display = (this.mendeleyCode || this.mendeleyAuth) ? 'none' : 'block';
 		const hideExtraMendeleyOptions = !this.mendeleyHasPreviouslyImported || !(this.mendeleyAuth || this.mendeleyCode);
 		document.getElementById('page-options-mendeley').style.display = hideExtraMendeleyOptions ? 'none' : 'block';
+		document.getElementById('page-options-relink-only').style.display = (hideExtraMendeleyOptions || this.mendeleyImporterVersion > 0) ? 'none' : null;
 		if (hideExtraMendeleyOptions) {
 			document.getElementById('new-items-only-checkbox').checked = false;
 		}
@@ -354,6 +359,16 @@ const Zotero_Import_Wizard = { // eslint-disable-line no-unused-vars
 		}
 	},
 
+	onRelinkOnlyChange() {
+		if (document.getElementById('relink-only-checkbox').checked) {
+			document.getElementById('new-items-only-checkbox').checked = true;
+			document.getElementById('create-collection').checked = false;
+		}
+
+		document.getElementById('new-items-only-checkbox').disabled = document.getElementById('relink-only-checkbox').checked;
+		document.getElementById('create-collection').disabled = document.getElementById('relink-only-checkbox').checked;
+	},
+
 	onURLInteract(ev) {
 		if (ev.type === 'click' || (ev.type === 'keydown' && ev.key === ' ')) {
 			Zotero.launchURL(ev.currentTarget.getAttribute('href'));
@@ -393,6 +408,7 @@ const Zotero_Import_Wizard = { // eslint-disable-line no-unused-vars
 			? document.getElementById('other-files').value
 			: null;
 		const newItemsOnly = document.getElementById('new-items-only-checkbox').checked;
+		const relinkOnly = document.getElementById('relink-only-checkbox').checked;
 		
 		try {
 			const result = await Zotero_File_Interface.importFile({
@@ -406,7 +422,8 @@ const Zotero_Import_Wizard = { // eslint-disable-line no-unused-vars
 				mimeTypes,
 				newItemsOnly,
 				onBeforeImport: this.onBeforeImport.bind(this),
-				recreateStructure
+				recreateStructure,
+				relinkOnly
 			});
 
 			// Cancelled by user or due to error

chrome/content/zotero/import/importWizard.xhtml

@@ -54,6 +54,9 @@
 			pageid="page-options"
 			data-header-label-id="import-options"
 		>
+			<div class="options-group" id="page-options-relink-only">
+				<checkbox id="relink-only-checkbox" data-l10n-id="import-online-relink-only" />
+			</div>
 			<div class="options-group" id="page-options-common">
 				<checkbox native="true" id="create-collection" data-l10n-id="import-create-collection" />
 			</div>

chrome/content/zotero/import/mendeley/mendeleyImport.js

@@ -32,6 +32,7 @@ var Zotero_Import_Mendeley = function () {
 	this.newCollections = [];
 	this.mendeleyAuth = null;
 	this.newItemsOnly = false;
+	this.relinkOnly = false;
 	
 	this._tokens = null;
 	this._db = null;
@@ -92,13 +93,15 @@ Zotero_Import_Mendeley.prototype.translate = async function (options = {}) {
 		skipSelect: true,
 		...(options.saveOptions || {})
 	};
+
+	this.newItemsOnly = this.newItemsOnly || this.relinkOnly;
 	
 	const libraryID = options.libraryID || Zotero.Libraries.userLibraryID;
 	const { key: rootCollectionKey } = options.collections
 		? Zotero.Collections.getLibraryAndKeyFromID(options.collections[0])
 		: {};
 
-	Zotero.debug(`Begining Mendeley import at ${this._started}. libraryID: ${libraryID}, linkFiles: ${this.linkFiles}, rootCollectionKey: ${rootCollectionKey}`);
+	Zotero.debug(`Begining Mendeley import at ${this._started}. libraryID: ${libraryID}, linkFiles: ${this.linkFiles}, rootCollectionKey: ${rootCollectionKey}, newItemsOnly: ${this.newItemsOnly}, relinkOnly: ${this.relinkOnly}`);
 	
 	// TODO: Get appropriate version based on schema version
 	const mapVersion = 83;
@@ -135,14 +138,17 @@ Zotero_Import_Mendeley.prototype.translate = async function (options = {}) {
 		this._progressMax = 50;
 		this._itemDone();
 
-		const folders = this._tokens
+		let folderKeys = new Map();
-			? await this._getFoldersAPI(mendeleyGroupID)
+		if(!this.relinkOnly) {
-			: await this._getFoldersDB(mendeleyGroupID);
+			const folders = this._tokens
+				? await this._getFoldersAPI(mendeleyGroupID)
+				: await this._getFoldersDB(mendeleyGroupID);
 
-		const collectionJSON = this._foldersToAPIJSON(folders, rootCollectionKey);
+			const collectionJSON = this._foldersToAPIJSON(folders, rootCollectionKey);
-		const folderKeys = this._getFolderKeys(collectionJSON);
+			folderKeys = this._getFolderKeys(collectionJSON);
 
-		await this._saveCollections(libraryID, collectionJSON, folderKeys);
+			await this._saveCollections(libraryID, collectionJSON, folderKeys);
+		}
 		
 		this._interruptChecker(true);
 		//
@@ -175,13 +181,13 @@ Zotero_Import_Mendeley.prototype.translate = async function (options = {}) {
 
 		this._interruptChecker(true);
 
-		let collections = this._tokens
+		let collections = this.relinkOnly ? new Map() : this._tokens
 			? await this._getDocumentCollectionsAPI(documents, rootCollectionKey, folderKeys)
 			: await this._getDocumentCollectionsDB(mendeleyGroupID, documents, rootCollectionKey, folderKeys);
 
 		this._interruptChecker(true);
-		
+
-		let files = this._tokens
+		let files = this.relinkOnly ? new Map() : this._tokens
 			? await this._getDocumentFilesAPI(documents)
 			: await this._getDocumentFilesDB(mendeleyGroupID);
 
@@ -1330,6 +1336,10 @@ Zotero_Import_Mendeley.prototype._saveItems = async function (libraryID, json) {
 				await item.loadPrimaryData();
 			}
 		}
+
+		if(this.relinkOnly && !isMappedToExisting) {
+			continue;
+		}
 		
 		// Remove external id before save
 		let toSave = Object.assign({}, itemJSON);

chrome/locale/en-US/zotero/zotero.ftl

@@ -61,6 +61,8 @@ import-online-intro2={ -app-name } will never see or store your { $targetApp } p
 import-online-form-intro = Please enter your credentials to log in to { $targetAppOnline }. This is necessary to import your { $targetApp } library into { -app-name }.
 import-online-wrong-credentials = Login to { $targetApp } failed. Please re-enter credentials and try again.
 import-online-blocked-by-plugin = The import cannot continue with { $plugin } installed. Please disable this plugin and try again.
+import-online-relink-only =
+    .label = Relink Mendeley Desktop citations
 
 report-error =
     .label = Report Error…

scss/components/_import-wizard.scss

@@ -42,6 +42,10 @@
 		margin: 0;
 	}
 
+	[disabled="true"] .checkbox-label {
+		opacity: .5;
+	}
+
 	#other-files {
 		margin-left: -1px;
 		width: 400px;

test/tests/mendeleyImportTest.js

@@ -402,5 +402,56 @@ describe('Zotero_Import_Mendeley', function () {
 			assert.equal(report.getField('title'), 'Sample Report');
 			assert.equal(report.getRelations()['mendeleyDB:documentUUID'], '616ec6d1-8d23-4414-8b6e-7bb129677577');
 		});
+
+		it("should only correct IDs and not add new items if \"relinkOnly\" is configured", async () => {
+			setHTTPResponse(server, 'https://api.mendeley.com/', {
+				method: 'GET',
+				url: `documents?view=all&limit=500`,
+				status: 200,
+				headers: {},
+				json: JSON.parse(
+					await Zotero.File.getContentsFromURLAsync('resource://zotero-unit-tests/data/mendeleyMock/items-simple-no-desktop-id.json')
+				)
+			});
+			const importer1 = getImporter();
+			await importer1.translate({
+				libraryID: Zotero.Libraries.userLibraryID,
+				collections: null,
+				linkFiles: false,
+			});
+
+			const report = (await Zotero.Relations
+				.getByPredicateAndObject('item', 'mendeleyDB:remoteDocumentUUID', '07a74c26-28d1-4d9f-a60d-3f3bc5ef76ef'))
+				.filter(item => item.libraryID == Zotero.Libraries.userLibraryID && !item.deleted)
+				.shift();
+
+			assert.equal(report.getField('title'), 'Sample Report');
+			assert.equal(report.getRelations()['mendeleyDB:documentUUID'], '07a74c26-28d1-4d9f-a60d-3f3bc5ef76ef');
+			
+			setHTTPResponse(server, 'https://api.mendeley.com/', {
+				method: 'GET',
+				url: `documents?view=all&limit=500`,
+				status: 200,
+				headers: {},
+				json: JSON.parse(
+					await Zotero.File.getContentsFromURLAsync('resource://zotero-unit-tests/data/mendeleyMock/items-updated.json')
+				)
+			});
+
+			const importer2 = getImporter();
+			importer2.relinkOnly = true;
+			await importer2.translate({
+				libraryID: Zotero.Libraries.userLibraryID,
+				collections: null,
+				linkFiles: false,
+			});
+
+			assert.equal(report.getField('title'), 'Sample Report');
+			assert.equal(report.getRelations()['mendeleyDB:documentUUID'], '616ec6d1-8d23-4414-8b6e-7bb129677577');
+
+			const noNewItemHere = await Zotero.Relations.getByPredicateAndObject('item', 'mendeleyDB:documentUUID', '86e56a00-5ae5-4fe8-a977-9298a03b16d6');
+			assert.lengthOf(noNewItemHere, 0);
+
+		});
 	});
 });