Manual merge of the new document preview code from the unstable branch

mayan/apps/documents/api.py

@@ -0,0 +1,71 @@
+from __future__ import absolute_import
+
+import logging
+
+from django.core.exceptions import PermissionDenied
+from django.shortcuts import get_object_or_404
+
+from rest_framework import generics
+from rest_framework.generics import RetrieveAPIView
+from rest_framework.response import Response
+
+from acls.models import AccessEntry
+from converter.exceptions import UnknownFileFormat, UnkownConvertError
+from converter.literals import (DEFAULT_ZOOM_LEVEL, DEFAULT_ROTATION,
+    DEFAULT_PAGE_NUMBER)
+from permissions.models import Permission
+
+from .conf.settings import DISPLAY_SIZE, ZOOM_MAX_LEVEL, ZOOM_MIN_LEVEL
+from .models import Document
+from .permissions import PERMISSION_DOCUMENT_VIEW
+from .resources import DocumentResourceSimple
+
+logger = logging.getLogger(__name__)
+
+# API Views
+
+
+class APIReadOnlyInstanceModelView(RetrieveAPIView):
+    allowed_methods = ['GET']
+    serializer_class = DocumentResourceSimple
+    queryset = Document.objects.all()
+
+
+class APIDocumentImageView(generics.GenericAPIView):
+    def get(self, request, pk):
+        document = get_object_or_404(Document, pk=pk)
+
+        logger.debug('document: %s' % document)
+
+        try:
+            Permission.objects.check_permissions(request.user, [PERMISSION_DOCUMENT_VIEW])
+        except PermissionDenied:
+            AccessEntry.objects.check_access(PERMISSION_DOCUMENT_VIEW, request.user, document)
+
+        size = request.GET.get('size', DISPLAY_SIZE)
+
+        page = int(request.GET.get('page', DEFAULT_PAGE_NUMBER))
+
+        zoom = int(request.GET.get('zoom', DEFAULT_ZOOM_LEVEL))
+
+        version = int(request.GET.get('version', document.latest_version.pk))
+
+        if request.GET.get('as_base64', False):
+            base64_version = True
+
+        if zoom < ZOOM_MIN_LEVEL:
+            zoom = ZOOM_MIN_LEVEL
+
+        if zoom > ZOOM_MAX_LEVEL:
+            zoom = ZOOM_MAX_LEVEL
+
+        rotation = int(request.GET.get('rotation', DEFAULT_ROTATION)) % 360
+
+        try:
+            return Response({'status': 'success',
+                'data': document.get_image(size=size, page=page, zoom=zoom, rotation=rotation, as_base64=True, version=version)
+                })
+        except UnknownFileFormat as exception:
+            return Response({'status': 'error', 'detail': 'unknown_file_format', 'message': unicode(exception)})
+        except UnkownConvertError as exception:
+            return Response({'status': 'error', 'detail': 'converter_error', 'message': unicode(exception)})