Add helpers for AnnotationDocumentInfo

src/components/AnnotationDocumentInfo.tsx

@@ -1,21 +1,33 @@
 import { Link } from '@hypothesis/frontend-shared';
 
+import type { Annotation } from '../helpers/annotation-metadata';
+import { domainAndTitle } from '../helpers/annotation-metadata';
+
 export type AnnotationDocumentInfoProps = {
-  /** The domain associated with the document */
-  domain?: string;
-  /** A direct link to the document */
-  link?: string;
-  title: string;
+  annotation: Annotation;
 };
+
 /**
  * Render some metadata about an annotation's document and link to it
  * if a link is available.
  */
 export default function AnnotationDocumentInfo({
-  domain,
-  link,
-  title,
+  annotation,
 }: AnnotationDocumentInfoProps) {
+  const { domain, titleText: title, titleLink } = domainAndTitle(annotation);
+  const annotationURL = annotation.links?.html || '';
+  // There are some cases at present in which linking directly to an
+  // annotation's document is not immediately feasible—e.g in an LMS context
+  // where the original document might not be available outside of an
+  // assignment (e.g. Canvas files), and/or wouldn't be able to present
+  // any associated annotations.
+  // For the present, disable links to annotation documents for all third-party
+  // annotations until we have a more nuanced way of making linking determinations.
+  // The absence of a link to a single-annotation view is a signal that this
+  // is a third-party annotation.
+  // Also, of course, verify that there is a URL to the document (titleLink)
+  const link = annotationURL && titleLink ? titleLink : '';
+
   return (
     <div className="flex gap-x-1">
       <div className="text-color-text-light">

src/components/test/AnnotationDocumentInfo-test.js

@@ -1,18 +1,35 @@
-import { checkAccessibility } from '@hypothesis/frontend-testing';
+import {
+  checkAccessibility,
+  mockImportedComponents,
+} from '@hypothesis/frontend-testing';
 import { mount } from '@hypothesis/frontend-testing';
 
-import AnnotationDocumentInfo from '../AnnotationDocumentInfo';
+import AnnotationDocumentInfo, { $imports } from '../AnnotationDocumentInfo';
 
 describe('AnnotationDocumentInfo', () => {
-  const createAnnotationDocumentInfo = props => {
-    return mount(
-      <AnnotationDocumentInfo
-        domain="www.foo.bar"
-        link="http://www.baz"
-        title="Turtles"
-        {...props}
-      />,
-    );
+  let fakeAnnotation;
+  let fakeDomainAndTitle;
+
+  beforeEach(() => {
+    fakeAnnotation = {
+      links: { html: 'https://example.com' },
+    };
+    fakeDomainAndTitle = sinon.stub().returns({
+      titleText: 'Turtles',
+      titleLink: 'http://www.baz',
+      domain: 'www.foo.com',
+    });
+
+    $imports.$mock(mockImportedComponents());
+    $imports.$mock({
+      '../helpers/annotation-metadata': {
+        domainAndTitle: fakeDomainAndTitle,
+      },
+    });
+  });
+
+  const createAnnotationDocumentInfo = () => {
+    return mount(<AnnotationDocumentInfo annotation={fakeAnnotation} />);
   };
 
   it('should render the document title', () => {
@@ -32,7 +49,8 @@ describe('AnnotationDocumentInfo', () => {
   it('does not link to document when no link available', () => {});
 
   it('should render domain if available', () => {
-    const wrapper = createAnnotationDocumentInfo({ link: '' });
+    fakeAnnotation.links.html = '';
+    const wrapper = createAnnotationDocumentInfo();
 
     const link = wrapper.find('a');
     assert.include(wrapper.text(), '"Turtles"');
@@ -42,9 +60,7 @@ describe('AnnotationDocumentInfo', () => {
   it(
     'should pass a11y checks',
     checkAccessibility({
-      content: () => {
-        return createAnnotationDocumentInfo();
-      },
+      content: () => createAnnotationDocumentInfo(),
     }),
   );
 });

src/helpers/annotation-metadata.ts

@@ -0,0 +1,115 @@
+export type Annotation = {
+  uri: string;
+  document: { title: string };
+  links: {
+    /** A "bouncer" URL that takes the user to see the annotation in context */
+    incontext?: string;
+    /** URL to view the annotation by itself. */
+    html?: string;
+  };
+};
+
+export type DocumentMetadata = {
+  uri: string;
+  domain: string;
+  title: string;
+};
+
+/**
+ * Extract document metadata from an annotation.
+ */
+export function documentMetadata(annotation: Annotation): DocumentMetadata {
+  const uri = annotation.uri;
+
+  let domain;
+  try {
+    domain = new URL(uri).hostname;
+  } catch {
+    // Annotation URI parsing on the backend is very liberal compared to the URL
+    // constructor. There is also some historic invalid data in h (eg [1]).
+    // Hence, we must handle URL parsing failures in the client.
+    //
+    // [1] https://github.com/hypothesis/client/issues/3666
+    domain = '';
+  }
+  if (domain === 'localhost') {
+    domain = '';
+  }
+
+  let title = domain;
+  if (annotation.document && annotation.document.title) {
+    title = annotation.document.title[0];
+  }
+
+  return { uri, domain, title };
+}
+
+export type DomainAndTitle = {
+  domain: string;
+  titleText: string;
+  titleLink: string | null;
+};
+
+/**
+ * Return the domain and title of an annotation for display on an annotation
+ * card.
+ */
+export function domainAndTitle(annotation: Annotation): DomainAndTitle {
+  return {
+    domain: domainTextFromAnnotation(annotation),
+    titleText: titleTextFromAnnotation(annotation),
+    titleLink: titleLinkFromAnnotation(annotation),
+  };
+}
+
+function titleLinkFromAnnotation(annotation: Annotation): string | null {
+  let titleLink: string | null = annotation.uri;
+
+  if (
+    titleLink &&
+    !(titleLink.indexOf('http://') === 0 || titleLink.indexOf('https://') === 0)
+  ) {
+    // We only link to http(s) URLs.
+    titleLink = null;
+  }
+
+  if (annotation.links && annotation.links.incontext) {
+    titleLink = annotation.links.incontext;
+  }
+
+  return titleLink;
+}
+/**
+ * Returns the domain text from an annotation.
+ */
+function domainTextFromAnnotation(annotation: Annotation): string {
+  const document = documentMetadata(annotation);
+
+  let domainText = '';
+  if (document.uri && document.uri.indexOf('file://') === 0 && document.title) {
+    const parts = document.uri.split('/');
+    const filename = parts[parts.length - 1];
+    if (filename) {
+      domainText = filename;
+    }
+  } else if (document.domain && document.domain !== document.title) {
+    domainText = document.domain;
+  }
+
+  return domainText;
+}
+
+/**
+ * Returns the title text from an annotation and crops it to 30 chars
+ * if needed.
+ */
+function titleTextFromAnnotation(annotation: Annotation): string {
+  const document = documentMetadata(annotation);
+
+  let titleText = document.title;
+  if (titleText.length > 30) {
+    titleText = titleText.slice(0, 30) + '…';
+  }
+
+  return titleText;
+}

src/helpers/index.ts

@@ -1,4 +1,6 @@
+export { documentMetadata } from './annotation-metadata';
 export { processAndReplaceMentionElements } from './mentions';
 
+export type { DocumentMetadata, DomainAndTitle } from './annotation-metadata';
 export type { Group, GroupType } from './groups';
 export type { Mention, MentionMode, InvalidMentionContent } from './mentions';