Use hex encoding for encodeKeyIfCaseSensitive

[steven-tey]

Summary by CodeRabbit

• New Features

  • Domain-aware encoding/decoding for link keys so keys on case-sensitive domains are handled reliably.
  • Public helpers to transparently encode/decode keys when needed, improving link stability across domains.

• Bug Fixes

  • Preserved backward compatibility so existing links continue to work.
  • More consistent link handling to avoid case-related issues.

• Tests

  • Minor test instrumentation added to aid debugging.

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Project	Deployment	Review	Updated (UTC)
dub	Ready	Preview	Jan 8, 2026 3:38pm

[coderabbitai]

📝 Walkthrough

Walkthrough

Encode/decode for link keys changed from base64 to lowercased hex with an "h:" prefix; decoding now supports both formats. New domain-aware helpers were added to conditionally encode/decode keys and reconstruct links for case-sensitive domains.

Changes

Cohort / File(s)	Summary
Link case-sensitivity logic apps/web/lib/api/links/case-sensitivity.ts	encodeKey() now returns lowercased hex prefixed with h:. decodeKey() recognizes h: (hex, case-insensitive) and falls back to legacy base64. Added isCaseSensitiveDomain, encodeKeyIfCaseSensitive, decodeKeyIfCaseSensitive, and decodeLinkIfCaseSensitive which use CASE_SENSITIVE_DOMAINS to conditionally apply encoding/decoding and reconstruct shortLink paths.
Redirects test apps/web/tests/redirects/index.test.ts	Minor test change: added console.log({baseUrl: h.baseUrl}) inside the "root" test (no control-flow changes).

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• Update CASE_SENSITIVE_DOMAINS #2662: Modifies the same encodeKey/decodeKey implementations and related constants.
• Fix decodeLinkIfCaseSensitive logic #2664: Alters decodeLinkIfCaseSensitive and related link conversion logic in the same file.

Suggested reviewers

• devkiran

Poem

🐰 I hop on keys both old and new,
With "h:" I hum a hexy tune,
Lowercase leaps, legacy stays,
Domains guide my careful ways,
A small rabbit cheers the change 🥕

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the primary change: implementing hex encoding for the new encodeKeyIfCaseSensitive function to address case-sensitivity issues.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In @apps/web/tests/redirects/index.test.ts:
- Line 19: Remove the debug console.log({baseUrl: h.baseUrl}) line from the test
(index.test.ts): delete that console.log call that references h.baseUrl so the
test output is clean, then run the test suite to confirm no residual debug
logging remains.

📜 Review details

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between df73241 and 107ef2a.

📒 Files selected for processing (1)

• apps/web/tests/redirects/index.test.ts

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)

• GitHub Check: build

[coderabbitai]

⚠️ Potential issue | 🟡 Minor

Remove debug console.log statement.

This console.log appears to be a debug artifact that should be removed before merging. It clutters test output without providing value in the production test suite.

🧹 Proposed fix

   test("root", async () => {
-    console.log({baseUrl: h.baseUrl})
-
     const response = await fetch(h.baseUrl, fetchOptions);

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change

	console.log({baseUrl: h.baseUrl})
	test("root", async () => {
	const response = await fetch(h.baseUrl, fetchOptions);

🤖 Prompt for AI Agents

In @apps/web/tests/redirects/index.test.ts at line 19, Remove the debug
console.log({baseUrl: h.baseUrl}) line from the test (index.test.ts): delete
that console.log call that references h.baseUrl so the test output is clean,
then run the test suite to confirm no residual debug logging remains.