[WIP] Optimize performance and UX for shortlink project

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Optimize the Cloudflare Worker shortlink project based on the following requirements:

1. Performance & Cost Optimization:

   • Remove the cleanupExpiredUrls function and the scheduled event handler. Cloudflare KV's native TTL (expirationTtl) handles expiration automatically, making manual cleanup redundant and costly.
   • Remove the access counting logic (updating accessCount and lastAccessed in KV) during redirects. KV is not designed for high-frequency writes (counters), and this slows down redirects and risks write conflicts.

2. Feature & UX Optimization:

   • Auto-generate Short Codes: Make the "Custom Path" (自定义后缀) optional in the frontend.
   • Update the backend (/create endpoint): If customPath is not provided, generate a random 6-character alphanumeric string. ensure it doesn't conflict with existing keys (simple retry logic or just check once).
   • Relax URL Validation: Modify isValidTargetUrl. Instead of failing on timeout/error, treat the URL as valid if the format is correct but the fetch check fails or times out. Reduce the timeout to 2 seconds. Log the warning but allow creation.

3. Code Structure:

   • Keep the HTML inside worker.js for now (to keep the single-file structure simple for the user), but update the HTML string to reflect the frontend changes (removing required attribute from the custom path input, updating placeholders).

4. Specific Code Changes:

   • Frontend (HTML string):
     • Remove required attribute from <input id="customPath">.
     • Update placeholder to indicate it's optional (e.g., "Optional: Leave empty for random").
     • Update JS validation in the HTML to allow empty customPath.
   • Backend (worker.js):
     • Delete cleanupExpiredUrls function.
     • Delete scheduled export.
     • In isValidTargetUrl: Reduce timeout to 2000ms. catch errors and return true (allowance) instead of false, perhaps just console.log the error.
     • In /create handler:
       • If data.customPath is empty, generate a random string (e.g., Math.random().toString(36).substring(2, 8)).
       • Ensure the random path doesn't exist (check KV).
     • In Redirect handler (path lookup):
       • Remove the code block that updates accessCount and writes back to KV. Just return Response.redirect.

File to modify: worker.js

This pull request was created as a result of the following prompt from Copilot chat.

Optimize the Cloudflare Worker shortlink project based on the following requirements:

1. Performance & Cost Optimization:

   • Remove the cleanupExpiredUrls function and the scheduled event handler. Cloudflare KV's native TTL (expirationTtl) handles expiration automatically, making manual cleanup redundant and costly.
   • Remove the access counting logic (updating accessCount and lastAccessed in KV) during redirects. KV is not designed for high-frequency writes (counters), and this slows down redirects and risks write conflicts.

2. Feature & UX Optimization:

   • Auto-generate Short Codes: Make the "Custom Path" (自定义后缀) optional in the frontend.
   • Update the backend (/create endpoint): If customPath is not provided, generate a random 6-character alphanumeric string. ensure it doesn't conflict with existing keys (simple retry logic or just check once).
   • Relax URL Validation: Modify isValidTargetUrl. Instead of failing on timeout/error, treat the URL as valid if the format is correct but the fetch check fails or times out. Reduce the timeout to 2 seconds. Log the warning but allow creation.

3. Code Structure:

   • Keep the HTML inside worker.js for now (to keep the single-file structure simple for the user), but update the HTML string to reflect the frontend changes (removing required attribute from the custom path input, updating placeholders).

4. Specific Code Changes:

   • Frontend (HTML string):
     • Remove required attribute from <input id="customPath">.
     • Update placeholder to indicate it's optional (e.g., "Optional: Leave empty for random").
     • Update JS validation in the HTML to allow empty customPath.
   • Backend (worker.js):
     • Delete cleanupExpiredUrls function.
     • Delete scheduled export.
     • In isValidTargetUrl: Reduce timeout to 2000ms. catch errors and return true (allowance) instead of false, perhaps just console.log the error.
     • In /create handler:
       • If data.customPath is empty, generate a random string (e.g., Math.random().toString(36).substring(2, 8)).
       • Ensure the random path doesn't exist (check KV).
     • In Redirect handler (path lookup):
       • Remove the code block that updates accessCount and writes back to KV. Just return Response.redirect.

File to modify: worker.js

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.