WEB-965: use parsed errorBody consistently in ErrorHandlerInterceptor

[RiteshGite]

Description

Prevents runtime crashes in ErrorHandlerInterceptor when handling malformed or ArrayBuffer-based API error responses.

This change updates the interceptor to consistently use the parsed errorBody instead of directly accessing response.error. It also safely handles nullable error fields using optional chaining and preserves fallback error message behavior.

This fixes cases where the global error handler could fail when:

• API errors were returned as ArrayBuffer
• errors[0] was missing
• defaultUserMessage or developerMessage was null/undefined

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Related Issues and Discussion

#WEB-965

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Reproduction Steps

To validate the unsafe cases, the interceptor's intercept() method was temporarily modified to force specific error payloads.

Scenario 1: Empty errors array

Temporary code used

intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
  return throwError(() =>
    new HttpErrorResponse({
      status: 400,
      url: request.url,
      error: { errors: [] }
    })
  ).pipe(catchError((error) => this.handleError(error, request)));
}

Expected issue before fix: Runtime error when the code tries to access errorBody.errors[0].

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Scenario 2: null defaultUserMessage

Temporary code used

intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
  return throwError(() =>
    new HttpErrorResponse({
      status: 400,
      url: request.url,
      error: {
        errors: [{
          defaultUserMessage: null,
          developerMessage: "Detailed logs"
        }]
      }
    })
  ).pipe(catchError((error) => this.handleError(error, request)));
}

Expected issue before fix: Runtime error when .replace() is called on null.

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Screenshots

1. Empty array crash

EmptyArray.mp4

2. Null value crash

nullError.mp4

3. After fix — error handler working correctly

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Checklist

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• If you have multiple commits please combine them into one commit by squashing them.
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Walkthrough

This PR refactors the error-handler interceptor's message-derivation logic to use safer optional chaining on parsed errorBody, improve database-integrity code detection via array includes(), and normalize messages by replacing dots with spaces. The single-file change affects how HTTP error responses map to user-facing error messages.

Changes

Error Handler Message Derivation

Layer / File(s)	Summary
Error message extraction and normalization src/app/core/http/error-handler.interceptor.ts	Lines 95–106 refactor errorMessage derivation from errorBody.errors[0] with safer optional chaining on defaultUserMessage/developerMessage; database-integrity detection now uses includes() to check userMessageGlobalisationCode and translates matching codes to a fixed integrity-issue message; non-integrity paths clean up messages by replacing dots with spaces via regex.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• openMF/web-app#3452: Both PRs modify src/app/core/http/error-handler.interceptor.ts to refine how errorMessage is derived from HTTP error payloads using userMessageGlobalisationCode and errorBody.errors[0].

Suggested reviewers

• alberto-art3ch

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title 'WEB-965: use parsed errorBody consistently in ErrorHandlerInterceptor' accurately summarizes the main change: using parsed errorBody instead of response.error in the error handler.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[IOhacker]

Could you please add an evidence of the change?

[alberto-art3ch]

LGTM

[RiteshGite]

@IOhacker Added evidence for the reported issue along with before/after screenshots. Please review again. Thanks!