Auto-link raw webexteams URIs (#8560)

* feat: auto-link webexteams URIs

* test: expect escaped webexteams URIs

---------

Co-authored-by: Aamer Akhter <aamer_akhter@users.noreply.bitbucket.org>

electron/shared-with-frontend/is-external-url-allowed.ts

@@ -31,6 +31,7 @@ export const ALLOWED_EXTERNAL_URL_SCHEMES = [
   'vscode-insiders:',
   'zotero:',
   'logseq:',
+  'webexteams:',
 ];
 
 const LOCAL_FILE_URL_PREFIX = 'file:///';

src/app/ui/is-external-url-allowed.spec.ts

@@ -22,6 +22,7 @@ describe('isExternalUrlSchemeAllowed', () => {
       'vscode-insiders://file/home/user/x.ts',
       'zotero://select/items/0_ABCD1234',
       'logseq://graph/Notes?page=Today',
+      'webexteams://im?space=ff135070-68f8-11f1-9229-c7e6cca7a7cd&message=f4f13440-6b50-11f1-8868-03e71232fa87',
     ];
     allowed.forEach((url) => {
       it(`allows "${url}"`, () => {
@@ -42,6 +43,7 @@ describe('isExternalUrlSchemeAllowed', () => {
         'vscode-insiders:',
         'zotero:',
         'logseq:',
+        'webexteams:',
       ]);
     });
   });

src/app/ui/marked-options-factory.spec.ts

@@ -390,13 +390,14 @@ describe('markedOptionsFactory', () => {
           // #8429: app deep-links must stay clickable
           'obsidian://open?vault=Notes',
           'vscode://file/home/user/x.ts',
+          'webexteams://im?space=ff135070-68f8-11f1-9229-c7e6cca7a7cd&message=f4f13440-6b50-11f1-8868-03e71232fa87',
         ].forEach((href) => {
           const result = linkRenderer({
             href,
             title: '',
             tokens: [{ type: 'text', raw: 'L', text: 'L' }],
           } as any);
-          expect(result).toContain(`href="${href}"`);
+          expect(result).toContain(`href="${escapeHtmlAttr(href)}"`);
         });
       });
 
@@ -414,6 +415,17 @@ describe('markedOptionsFactory', () => {
         );
       });
     });
+
+    it('auto-links raw webexteams:// URIs with their query string intact', () => {
+      const uri =
+        'webexteams://im?space=ff135070-68f8-11f1-9229-c7e6cca7a7cd&message=f4f13440-6b50-11f1-8868-03e71232fa87';
+      const result = parseWithFactory(`Open ${uri}`);
+
+      expect(result).toContain(`href="${uri.replace(/&/g, '&')}"`);
+      expect(result).toContain(
+        'webexteams://im?space=ff135070-68f8-11f1-9229-c7e6cca7a7cd&message=f4f13440-6b50-11f1-8868-03e71232fa87',
+      );
+    });
   });
 
   describe('image renderer', () => {

src/app/ui/marked-options-factory.ts

@@ -1,5 +1,10 @@
 import { MarkedOptions, MarkedRenderer } from 'ngx-markdown';
-import { Hooks, Token } from 'marked';
+import {
+  Hooks,
+  type Token,
+  type TokenizerExtensionFunction,
+  type TokenizerStartFunction,
+} from 'marked';
 import {
   isExternalUrlSchemeAllowed,
   isPathSafeToOpen,
@@ -62,6 +67,48 @@ export const preprocessMarkdown = (markdown: string): string => {
   );
 };
 
+const WEBEX_TEAMS_URI_PREFIX = 'webexteams://';
+const WEBEX_TEAMS_URI_RE = /^webexteams:\/\/\S{1,2000}/i;
+const WEBEX_TRAILING_PUNCT_RE = /[.,;!?]+$/;
+
+const stripWebexTeamsUriTrailing = (raw: string): string => {
+  const uri = raw.replace(WEBEX_TRAILING_PUNCT_RE, '');
+  let opens = 0;
+  let closes = 0;
+  for (let i = 0; i < uri.length; i++) {
+    const c = uri.charCodeAt(i);
+    if (c === 40) opens++;
+    else if (c === 41) closes++;
+  }
+  let end = uri.length;
+  while (end > 0 && uri.charCodeAt(end - 1) === 41 && closes > opens) {
+    end--;
+    closes--;
+  }
+  return end < uri.length ? uri.substring(0, end) : uri;
+};
+
+const startWebexTeamsAutoLink: TokenizerStartFunction = (src: string): number | void => {
+  const index = src.toLowerCase().indexOf(WEBEX_TEAMS_URI_PREFIX);
+  return index >= 0 ? index : undefined;
+};
+
+const tokenizeWebexTeamsAutoLink: TokenizerExtensionFunction = (src: string) => {
+  const match = WEBEX_TEAMS_URI_RE.exec(src);
+  if (!match) {
+    return undefined;
+  }
+
+  const href = stripWebexTeamsUriTrailing(match[0]);
+  return {
+    type: 'link',
+    raw: href,
+    href,
+    text: href,
+    tokens: [{ type: 'text', raw: href, text: href }],
+  };
+};
+
 export const markedOptionsFactory = (): MarkedOptions => {
   const renderer = new MarkedRenderer();
 
@@ -196,6 +243,12 @@ export const markedOptionsFactory = (): MarkedOptions => {
     gfm: true,
     breaks: true,
     pedantic: false,
+    extensions: {
+      renderers: {},
+      childTokens: {},
+      inline: [tokenizeWebexTeamsAutoLink],
+      startInline: [startWebexTeamsAutoLink],
+    },
   };
 
   // Add preprocessing hook to handle image sizing syntax

src/app/ui/pipes/render-links.pipe.spec.ts

@@ -240,6 +240,18 @@ describe('RenderLinksPipe', () => {
       expect((result.match(/<a /g) || []).length).toBe(2);
     });
 
+    it('should auto-link plain webexteams:// URIs and preserve query params', () => {
+      const uri =
+        'webexteams://im?space=ff135070-68f8-11f1-9229-c7e6cca7a7cd&message=f4f13440-6b50-11f1-8868-03e71232fa87';
+      const result = html(pipe.transform(`Open ${uri}`));
+
+      expect(result).toContain(`href="${uri.replace(/&/g, '&amp;')}"`);
+      expect(result).toContain(
+        '>webexteams://im?space=ff135070-68f8-11f1-9229-c7e6cca7a7cd&amp;message=f4f13440-6b50-11f1-8868-03e71232fa87</a>',
+      );
+      expect(result).not.toContain('http://webexteams');
+    });
+
     it('should reject empty URLs in markdown links', () => {
       const result = html(pipe.transform('[text]()'));
       expect(result).toContain('text');

src/app/ui/pipes/render-links.pipe.ts

@@ -13,11 +13,12 @@ export const hasLinkHints = (text: string): boolean =>
   text.includes(LINK_HINT_WWW) ||
   text.includes(LINK_HINT_MARKDOWN);
 
-// URL regex matching URLs with protocol (http, https, file) or www prefix.
+// URL regex matching URLs with protocol (http, https, file, webexteams) or www prefix.
 // ftp://, ssh://, blob:, etc. are intentionally excluded — they are either
 // non-browsable or handled by _isUrlSchemeSafe's denylist for markdown links.
 // Limit URL length to 2000 chars to prevent ReDoS attacks.
-const URL_REGEX = /(?:(?:https?|file):\/\/\S{1,2000}(?=\s|$)|www\.\S{1,2000}(?=\s|$))/gi;
+const URL_REGEX =
+  /(?:(?:https?|file|webexteams):\/\/\S{1,2000}(?=\s|$)|www\.\S{1,2000}(?=\s|$))/gi;
 
 // Markdown link regex: [title](url)
 // The URL group allows one level of balanced parentheses so that links like