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verify-links: catch broken anchors, directory links, and invisible characters (#33713)

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* verify-links: catch broken anchors, directory links, and invisible characters

Enhances the link verification script to catch several categories of
broken links that were previously missed:

- Broken anchors (cross-file and same-file) by extracting heading slugs
  from target documents and verifying anchors resolve
- Directory links missing index.md suffix within docs/
- Invisible/zero-width characters in URLs
- Case-sensitive anchor mismatches

Also strips fenced code blocks before scanning for links to avoid false
positives, and handles duplicate heading slug deduplication (GitHub and
Docusaurus append -1, -2, etc.).

Fixes a few newly-caught broken links in existing docs.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

* Fix CodeQL incomplete multi-character sanitization alert

Apply HTML tag stripping in a loop so that nested fragments
like <scr<script>ipt> are fully removed.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

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Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
This commit is contained in:
Patrik Oldsberg
2026-04-03 17:48:40 +02:00
committed by GitHub
parent 75db4afdec
commit 8f9c1d64b8
5 changed files with 161 additions and 15 deletions
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docs/frontend-system/building-plugins/01-index.md
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@@ -200,7 +200,7 @@ export const examplePlugin = createFrontendPlugin({
## Plugin specific extensions
There are many different plugins that you can extend with additional functionality through extensions. One such plugin is [the catalog plugin](../../features/software-catalog/), one of the core features of Backstage. It lets you catalog the software in your organization, where each item in the catalog has its own page that can be populated with tools and information relating to that catalog entity. In this example we will explore how our plugin can provide such a tool to display on an entity page.
There are many different plugins that you can extend with additional functionality through extensions. One such plugin is [the catalog plugin](../../features/software-catalog/index.md), one of the core features of Backstage. It lets you catalog the software in your organization, where each item in the catalog has its own page that can be populated with tools and information relating to that catalog entity. In this example we will explore how our plugin can provide such a tool to display on an entity page.
```tsx title="in src/plugin.ts - An example entity content extension"
import { EntityContentBlueprint } from '@backstage/plugin-catalog-react/alpha';