feat: add logging

src/common/filters/http-exception.filter.spec.ts

@@ -6,10 +6,11 @@ describe('HttpExceptionFilter', () => {
     const status = jest.fn().mockReturnThis();
     const type = jest.fn().mockReturnThis();
     const json = jest.fn();
+    const locals: Record<string, unknown> = {};
     const filter = new HttpExceptionFilter();
     const host = {
       switchToHttp: () => ({
-        getResponse: () => ({ status, type, json }),
+        getResponse: () => ({ status, type, json, locals }),
       }),
     } as unknown as ArgumentsHost;
 
@@ -21,5 +22,8 @@ describe('HttpExceptionFilter', () => {
       status: 500,
       code: 'INTERNAL_SERVER_ERROR',
     });
+    expect(locals.publicErrorCode).toBe('INTERNAL_SERVER_ERROR');
+    expect(typeof locals.errorStack).toBe('string');
+    expect(locals.errorStack).not.toContain('database password: secret');
   });
 });

src/common/filters/http-exception.filter.ts

@@ -23,12 +23,24 @@ export class HttpExceptionFilter implements ExceptionFilter {
     const isValidation = Array.isArray(
       (payload as { message?: unknown })?.message,
     );
+    const code = isValidation
+      ? 'VALIDATION_ERROR'
+      : this.codeFor(status, payload);
+    (response.locals ??= {}).publicErrorCode = code;
+    if (
+      status >= Number(HttpStatus.INTERNAL_SERVER_ERROR) &&
+      exception instanceof Error
+    )
+      response.locals.errorStack = exception.stack
+        ?.split('\n')
+        .slice(1)
+        .join('\n');
     response
       .status(status)
       .type('application/problem+json')
       .json({
         status,
-        code: isValidation ? 'VALIDATION_ERROR' : this.codeFor(status, payload),
+        code,
         ...(isValidation
           ? {
               errors: this.validationErrors(