[PM-29660] allowing null for continuationToken

[cd-bitwarden]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-29660

📔 Objective

Allow null to be returned for continuation token instead of returning "" for eventsController.cs

📸 Screenshots

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[github-actions]

Checkmarx One – Scan Summary & Details – 73575d38-785a-4fed-9833-e766286d1d19

Great job! No new security vulnerabilities introduced in this pull request

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.89%. Comparing base (484a8e4) to head (740b31e).

Files with missing lines	Patch %	Lines
...rc/Api/Dirt/Public/Controllers/EventsController.cs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6753      +/-   ##
==========================================
- Coverage   58.83%   54.89%   -3.95%     
==========================================
  Files        1925     1925              
  Lines       85355    85355              
  Branches     7652     7652              
==========================================
- Hits        50217    46852    -3365     
- Misses      33269    36716    +3447     
+ Partials     1869     1787      -82     

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[claude]

Claude finished @cd-bitwarden's task in 2m 27s —— View job

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Code Review Complete

• Starting code review
• Analyzing changes
• Posting feedback

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Summary

The code changes are technically correct and improve semantic clarity by using null instead of empty string for continuation tokens. However, there are a few considerations:

Findings

1. ♻️ Redundant null coalescing operator

Location: EventsController.cs:127

The expression result.ContinuationToken ?? null is redundant since the property is already nullable:

// Current
var response = new PagedListResponseModel<EventResponseModel>(eventResponses, result.ContinuationToken ?? null);

// Should be
var response = new PagedListResponseModel<EventResponseModel>(eventResponses, result.ContinuationToken);

2. ❓ Breaking API change consideration

Location: PagedListResponseModel.cs

Making ContinuationToken nullable changes the public API contract. Previously, it was guaranteed to be non-null (token or empty string). Now it can be null.

Questions:

• Has this breaking change been communicated to API consumers?
• Is there API versioning in place?
• Have known consumers been verified to handle null properly?
• Will this be documented in release notes?

Note: The change is semantically correct - it aligns with repository behavior and improves clarity (null = no more pages). The concern is about API contract management.

Positive Observations

• ✅ Aligns with repository layer behavior
• ✅ Existing tests already handle null
• ✅ Diagnostic logger properly handles null with string.IsNullOrEmpty()
• ✅ Follows ADR 0024 (nullable reference types)

Test Coverage

⚠️ Codecov reports 33.33% patch coverage with 4 lines missing coverage in EventsController.cs. Consider adding tests for the null continuation token path.

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[eliykat]

Easy fix! Thanks for handling. Just one suggestion to protect us in the future.