Fix importing of standalone attachments

Maybe has been broken for years?

https://forums.zotero.org/discussion/99020/warning-data-loss-when-exporting-collections

chrome/content/zotero/xpcom/attachments.js

@@ -270,7 +270,7 @@ Zotero.Attachments = new function(){
 	
 	
 	/**
-	 * @param {Object} options - 'file', 'url', 'title', 'contentType', 'charset', 'parentItemID', 'singleFile'
+	 * @param {Object} options - 'file', 'url', 'title', 'contentType', 'charset', 'libraryID', 'parentItemID', 'singleFile'
 	 * @param {Object} [options.saveOptions] - Options to pass to Zotero.Item::save()
 	 * @return {Promise<Zotero.Item>}
 	 */
@@ -287,10 +287,22 @@ Zotero.Attachments = new function(){
 		var title = options.title;
 		var contentType = options.contentType;
 		var charset = options.charset;
+		var libraryID = options.libraryID;
 		var parentItemID = options.parentItemID;
 		var saveOptions = options.saveOptions;
 		
-		if (!parentItemID) {
+		if (parentItemID) {
+			libraryID = Zotero.Items.getLibraryAndKeyFromID(parentItemID).libraryID;
+		}
+		else if (contentType == 'text/html') {
+			throw new Error("parentItemID not provided");
+		}
+		else if (!libraryID) {
+			throw new Error("parentItemID or libraryID must be provided");
+		}
+		
+		// Webpage snapshots must have parent items
+		if (!parentItemID && contentType == 'text/html') {
 			throw new Error("parentItemID not provided");
 		}
 		
@@ -299,7 +311,6 @@ Zotero.Attachments = new function(){
 			yield Zotero.DB.executeTransaction(function* () {
 				// Create a new attachment
 				attachmentItem = new Zotero.Item('attachment');
-				let {libraryID, key: parentKey} = Zotero.Items.getLibraryAndKeyFromID(parentItemID);
 				attachmentItem.libraryID = libraryID;
 				attachmentItem.setField('title', title);
 				attachmentItem.setField('url', url);

chrome/content/zotero/xpcom/translation/translate_item.js

@@ -668,6 +668,7 @@ Zotero.Translate.ItemSaver.prototype = {
 					title: attachment.title,
 					contentType: attachment.mimeType,
 					charset: attachment.charset,
+					libraryID: this._libraryID,
 					parentItemID,
 					collections: !parentItemID ? this._collections : undefined,
 					saveOptions: this._saveOptions,

test/tests/importExportTest.js

@@ -94,5 +94,51 @@ describe("Import/Export", function () {
 			assert.sameMembers(newNote1.relatedItems, [newNote2]);
 			assert.sameMembers(newNote2.relatedItems, [newNote1]);
 		});
+		
+		it("should import standalone PDF attachment", async function () {
+			var rdf = `<rdf:RDF
+ xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+ xmlns:z="http://www.zotero.org/namespaces/export#"
+ xmlns:dc="http://purl.org/dc/elements/1.1/"
+ xmlns:dcterms="http://purl.org/dc/terms/"
+ xmlns:link="http://purl.org/rss/1.0/modules/link/"
+ xmlns:bib="http://purl.org/net/biblio#"
+ xmlns:foaf="http://xmlns.com/foaf/0.1/"
+ xmlns:prism="http://prismstandard.org/namespaces/1.2/basic/">
+    <z:Attachment rdf:about="#item_66055">
+        <z:itemType>attachment</z:itemType>
+        <rdf:resource rdf:resource="files/1234/test.pdf"/>
+        <dc:identifier>
+            <dcterms:URI>
+                <rdf:value>https://example.com</rdf:value>
+            </dcterms:URI>
+        </dc:identifier>
+        <dcterms:dateSubmitted>2022-07-22 06:36:31</dcterms:dateSubmitted>
+        <dc:title>Test PDF</dc:title>
+        <z:linkMode>1</z:linkMode>
+        <link:type>application/pdf</link:type>
+    </z:Attachment>
+</rdf:RDF>
+`;
+			var libraryID = Zotero.Libraries.userLibraryID;
+			var tempDir = await getTempDirectory();
+			var file = OS.Path.join(tempDir, 'export.rdf');
+			await Zotero.File.putContentsAsync(file, rdf);
+			var folder = OS.Path.join(tempDir, 'files', '1234');
+			await OS.File.makeDir(folder, { from: tempDir });
+			await OS.File.copy(
+				OS.Path.join(OS.Path.join(getTestDataDirectory().path, 'test.pdf')),
+				OS.Path.join(folder, 'test.pdf')
+			);
+			
+			var translation = new Zotero.Translate.Import();
+			translation.setLocation(Zotero.File.pathToFile(file));
+			let translators = await translation.getTranslators();
+			translation.setTranslator(translators[0]);
+			var newItem = (await translation.translate({ libraryID }))[0];
+			assert.equal(newItem.itemType, 'attachment');
+			assert.equal(newItem.getField('title'), 'Test PDF');
+			assert.ok(await newItem.getFilePathAsync());
+		});
 	});
 });