Return JSON Error instead of http status

django/allgo/api/v1/views.py

-import hashlib
 import logging
 import os
 
 import config.env
-
 from django.core.validators import ValidationError
-from django.http import HttpResponse, JsonResponse, FileResponse
+from django.http import JsonResponse
 from django.shortcuts import redirect
 from django.views.decorators.csrf import csrf_exempt
 from django.views.generic import View
-
-from main.models import Job, Webapp, JobQueue
 from main.helpers import upload_data, get_base_url, lookup_job_file, get_request_user
 from main.mixins import JobAuthMixin
+from main.models import Job, Webapp, JobQueue
 
 log = logging.getLogger('allgo')
 
@@ -21,7 +18,6 @@ BUF_SIZE = 65536
 
 
 def get_link(jobid, dir, filename, request):
-    filepath = os.path.join(dir, filename)
     return '/'.join((get_base_url(request), "datastore", str(jobid), filename))
 
 
@@ -35,17 +31,22 @@ def job_response(job, request):
               6: 'aborting'}
     job_dir = job.data_dir
     files = {f: get_link(job.id, job_dir, f, request) for f in os.listdir(job_dir)
-            if lookup_job_file(job.id, f)}
+             if lookup_job_file(job.id, f)}
     return {str(job.id): {'status': status[job.state],
                           'files': files
                           }
             }
 
+
 class APIJobView(JobAuthMixin, View):
 
     def get(self, request, pk):
-        job = Job.objects.get(id=pk)
-        return JsonResponse(job_response(job, request))
+        try:
+            job = Job.objects.get(id=pk)
+            return JsonResponse(job_response(job, request))
+        except Job.DoesNotExist as e:
+            log.error("Job not found %s", str(e))
+            return JsonResponse({'error': 'Job not found'}, status=404)
 
 
 @csrf_exempt
@@ -54,7 +55,7 @@ def jobs(request):
     if not user:
         log.info("API request without http authorisation %s %s %s", request.META['HTTP_USER_AGENT'],
                  request.META['REMOTE_ADDR'], request.META['QUERY_STRING'])
-        return HttpResponse(status=401)
+        return JsonResponse({'error': 'API request without http authorisation'}, status=401)
 
     if request.POST['job[webapp_id]'].isdigit():
         app = Webapp.objects.filter(id=request.POST['job[webapp_id]']).first()
@@ -62,21 +63,21 @@ def jobs(request):
         app = Webapp.objects.filter(name=request.POST['job[webapp_id]']).first()
 
     if not app:
-        return HttpResponse("App not found", status=404)
+        return JsonResponse({'error': 'Application not found'}, status=404)
 
     queue = app.job_queue
     if 'job[queue]' in request.POST:
         try:
             queue = JobQueue.objects.get(name=request.POST['job[queue]'])
         except JobQueue.DoesNotExist:
-            return HttpResponse("Unknown queue", status=400)
+            return JsonResponse({'error': 'Unknown queue'}, status=400)
 
     log.info("Job submit by user %s", user)
     job = Job.objects.create(param=request.POST['job[param]'], queue=queue, webapp=app, user=user.user)
-    job.version = app.get_webapp_version().number #TODO: add version selection in the api
+    job.version = app.get_webapp_version().number  # TODO: add version selection in the api
     if job.version is None:
         log.debug('No usable versions')
-        return HttpResponse("This app is not yet published", status=404)
+        return JsonResponse({'error': "This app is not yet published"}, status=404)
 
     upload_data(request.FILES.values(), job)
 
@@ -84,7 +85,7 @@ def jobs(request):
     try:
         job.full_clean()
     except ValidationError as e:
-        return HttpResponse("Invalid parameters: %s" % e.error_dict, status=400)
+        return JsonResponse({'error': "Invalid parameters: %s" % e.error_dict}, status=400)
 
     # start the job
     job.state = Job.WAITING