Improve user ID validation error messages and request body checks

[ShadowInCache]

… body checks

Summary by CodeRabbit

• Bug Fixes

  • Improved error handling for invalid user references in event creation.
  • Enhanced validation for bulk user operations to properly reject malformed requests.

• Tests

  • Added test coverage for event creation validation and bulk operation error handling.

• Chores

  • Updated monitoring metrics.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f32aa5a3-5d42-4e19-9da7-8beaf8d072af

📥 Commits

Reviewing files that changed from the base of the PR and between 0d61691 and 6646b12.

📒 Files selected for processing (4)

• app/routes/events.py
• app/routes/users.py
• app/tests/test_integration.py
• security/canary_state.env

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📝 Walkthrough

Walkthrough

This pull request improves error handling and request validation across two API endpoints. The /events endpoint error message for non-existent users was updated. The /users/bulk endpoint now properly differentiates between missing request bodies and invalid JSON payloads. Three corresponding integration tests were added, and runtime canary metrics were updated.

Changes

Cohort / File(s)	Summary
Error Message Update app/routes/events.py	Updated 404 error message for non-existent user_id from "invalid user_id" to "User not found".
Request Validation Enhancement app/routes/users.py	Modified POST /users/bulk parsing to differentiate between missing/empty body (sets data = {}), non-empty body with invalid JSON (returns 400), and non-dictionary JSON (returns 400 instead of defaulting to {}).
Test Coverage Addition app/tests/test_integration.py	Added three new tests: one verifying consecutive URL creations use distinct short codes, one validating the updated event 404 error response, and one confirming bulk user creation rejects non-object JSON with appropriate 400 response.
Canary Metrics Update security/canary_state.env	Updated runtime canary state metrics: success total count increased from 1286 to 1406, last run timestamp updated, and latency measurements for multiple demo services adjusted.

Possibly Related PRs

• Enhance JSON parsing and validation for event and URL routes #8: Aligns the 404 response in create_event to return the standardized {"error":"User not found","code":404} error message.
• Add validation for user_id and url_id, improve error handling #14: Makes related changes to request JSON parsing and validation (handling missing/non-object bodies) with corresponding test coverage for request validation scenarios.
• Implement user_id validation for URL updates, deletions, and events #11: Modifies the POST /events handler in app/routes/events.py with user ownership validation logic that can return 403 responses.

Poem

🐰 With better messages and clearer validation,
The API's refined with each correction,
User not found now speaks with clarity,
Request bodies parsed with great rarity,
Tests ensure the logic's right! ✨

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🎯 2 (Simple) | ⏱️ ~12 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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