Preserve PNG uploads as PNG and make image storage format-aware

[Copilot]

PNG uploads were being converted to JPEG, which removes alpha transparency. This change keeps PNG assets as .png while preserving compatibility with existing .jpeg images across read and cleanup paths.

• Upload format preservation

  • Frontend image recompression now keeps PNG input as image/png (instead of forcing image/jpeg).
  • Backend upload parsing now derives storage extension from the incoming data URL and writes ${imageId}.png for PNG, ${imageId}.jpeg otherwise.

• Format-aware image serving

  • Image fetch path now resolves files by trying supported extensions (.png, .jpeg) for a given imageId.
  • Response Content-Type now reflects the resolved file type (image/png or image/jpeg).

• Retention and deletion compatibility

  • Repository tree scan now recognizes both .png and .jpeg image objects.
  • Cleanup/deletion logic now deletes whichever supported extension exists for the target imageId.

const imageExtension: ImageExtension =
  imageMatch[1].toLowerCase() === 'png' ? 'png' : 'jpeg';

await fetch(githubApiUrl(env, `/contents/${imageId}.${imageExtension}`), {
  method: 'PUT',
  // ...
});

• Fixes Store .png in .png files instead of converting them to .jpeg files #18

[cloudflare-workers-and-pages]

Deploying with    Cloudflare Workers

The latest updates on your project. Learn more about integrating Git with Workers.

Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	image	8f5dbca	Commit Preview URL Branch Preview URL	Aug 22 2026, 12:23 PM

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 8f5dbca6a3

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[chatgpt-codex-connector]

Update purge workflow for PNG image histories

When this line starts storing PNG uploads as ${imageId}.png, the second cleanup stage stops covering those files: target-repository/scripts/purge-deleted-image-history.sh:26 and :30 still only select deleted *.jpeg paths. The Worker can delete stale PNGs from HEAD, but the documented history-purge workflow will never select their deleted paths, so PNG uploads continue consuming repository history indefinitely; please extend that script to include .png alongside .jpeg.

Useful? React with 👍 / 👎.

[chatgpt-codex-connector]

Commit the rebuilt browser bundle

This source change does not reach clients that use the checked-in Worker assets: wrangler.toml serves ./public, public/index.html loads /main.js, and the current public/main.js still calls toDataURL("image/jpeg", z). In deployments or reviews that serve the committed public directory without regenerating it, PNG uploads larger than 1 MiB are still converted to JPEG before /upload; please rebuild and commit public/main.js or remove the stale checked-in bundle from the served path.

Useful? React with 👍 / 👎.