- Migrated from https://github.com/Yetangitu/owncloud-apps

- substantial bit rot accrued in 4 years of non-maintenance which made Reader unusable
 - Reader now works reliably on public pages - or at least it _Works For Me™_

 - Refactored a substantial part of the code to comply to the "current" (ha ha) Nextcloud API
 - Dropped Owncloud compatibility for lack of a testing installation
 - Dropped IE (<11) support
 - Dropped compatibility with older (<20) Nextcloud versions
 - Dropped app-specific ajax code, now handled by SettingsController
 - Updated dependencies where applicable

vendor/pdfjs/controllers/annotationlayer_controller.js

@@ -0,0 +1,59 @@
+PDFJS.Reader.AnnotationLayerController = function (options, reader) {
+
+    this.reader = reader;
+    this.annotationDiv = options.annotationDiv;
+    this.pdfPage = options.pdfPage;
+    this.renderInteractiveForms = options.renderInteractiveForms;
+    this.linkService = options.linkService;
+    this.downloadManager = options.downloadManager;
+
+    this.div = null;
+
+    return this;
+};
+
+PDFJS.Reader.AnnotationLayerController.prototype.render = function (viewport, intent) {
+	var self = this;
+	var parameters = {
+		intent: (intent === undefined ? 'display' : intent),
+	};
+
+	this.pdfPage.getAnnotations(parameters).then(function (annotations) {
+		viewport = viewport.clone({ dontFlip: true });
+		parameters = {
+			viewport: viewport,
+			div: self.div,
+			annotations: annotations,
+			page: self.pdfPage,
+			renderInteractiveForms: self.renderInteractiveForms,
+			linkService: self.linkService,
+			downloadManager: self.downloadManager,
+		};
+
+		if (self.div) {
+			// If an annotationLayer already exists, refresh its children's
+			// transformation matrices.
+			PDFJS.AnnotationLayer.update(parameters);
+		} else {
+			// Create an annotation layer div and render the annotations
+			// if there is at least one annotation.
+			if (annotations.length === 0) {
+				return;
+			} 
+
+            self.div = self.annotationDiv;
+			parameters.div = self.div;
+
+			PDFJS.AnnotationLayer.render(parameters);
+		}
+	});
+};
+
+PDFJS.Reader.AnnotationLayerController.prototype.hide = function () {
+
+    if (!this.div) {
+        return;
+    }
+
+    this.div.setAttribute('hidden', 'true');
+};