fix: pdf base64 decode tracestate header

[martinothamar]

Description

Companion PR for Altinn/app-lib-dotnet#1645

Related Issue(s)

• N/A

Verification/QA

• Manual functionality testing
  • I have tested these changes manually
  • Creator of the original issue (or service owner) has been contacted for manual testing (or will be contacted when released in alpha)
  • No testing done/necessary
• Automated tests
  • Unit test(s) have been added/updated
  • Cypress E2E test(s) have been added/updated
  • No automatic tests are needed here (no functional changes/additions)
  • I want someone to help me make some tests
• UU/WCAG (follow these guidelines until we have our own)
  • I have tested with a screen reader/keyboard navigation/automated wcag validator
  • No testing done/necessary (no DOM/visual changes)
  • I want someone to help me perform accessibility testing
• User documentation @ altinn-studio-docs
  • Has been added/updated
  • No functionality has been changed/added, so no documentation is needed
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• Support in Altinn Studio
  • Issue(s) created for support in Studio
  • This change/feature does not require any changes to Altinn Studio
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Summary by CodeRabbit

• Bug Fixes
  • Improved trace data handling in PDF propagation with enhanced validation and error recovery. Added graceful fallback mechanism when data decoding encounters issues, ensuring more reliable trace propagation.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Enhances tracestate header handling in the PDF propagation module by adding base64 decoding logic. The code now attempts to decode the tracestate cookie value before transmission, with fallback to the original value and error logging if decoding fails.

Changes

Cohort / File(s)	Summary
Tracestate base64 decoding enhancement src/features/propagateTraceWhenPdf/index.ts	Added try-catch wrapped atob() decoding for tracestate cookie value with validation check for non-empty string; implements fallback to original value and error logging on decode failure

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: fixing base64 decoding of the tracestate header in the PDF propagation path.
Description check	✅ Passed	The description follows the required template structure with all major sections present, though most verification/QA checkboxes remain unchecked, which is acceptable for a companion PR addressing a specific bug fix.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/pdf-base64-decode-tracestate

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[sonarqubecloud]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 45%)
0.0% Condition Coverage on New Code (required ≥ 45%)

See analysis details on SonarQube Cloud

[danielskovli]

LGTM! Hvis du merger uten en approve her, får du kanskje #yolo badge 😄