fix: Fetch uncached assets from remote server#301
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Check for valid asset paths before attempting to access them.
Ensure assets not cached locally still load in the editor. E.g., we do not download and cache images loaded within CSS files.
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* Suggestions * docs: Fix inline comment typo --------- Co-authored-by: David Calhoun <github@davidcalhoun.me>
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jkmassel
approved these changes
Jan 29, 2026
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What?
Prevents crashes when the editor requests assets that aren't in the local cache and adds a fallback to fetch them from the original server.
Why?
Inserting certain plugin blocks (e.g., the Writing Prompt block) causes a crash because:
url(/icon.svg)gbk-cache-httpsscheme.js/.cssfiles are cached)assetDataPath(for:)method's precondition fails when the path escapes the bundle root, causing a crashFix CMM-1176. Fix JETPACK-IOS-1JFR.
How?
Two changes:
Added
isValidAssetPath(for:)- A safe method to check if a URL resolves to a valid path within the bundle root, without triggering the precondition crashAdded remote fetching fallback - When an asset isn't in the local cache (invalid path or missing file), the provider now fetches it from the original HTTPS URL and serves it to the WebView
Testing Instructions
Accessibility Testing Instructions
N/A - No UI changes
Screenshots or screencast
N/A
Footnotes
I was unable to reproduce the crash locally, only in the TestFlight build. ↩