root / api / images.py @ 5509b599
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#
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# Copyright (c) 2010 Greek Research and Technology Network
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#
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from synnefo.api.common import method_not_allowed |
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from synnefo.api.faults import BadRequest |
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from synnefo.api.util import (isoformat, isoparse, get_vm, get_image, get_image_meta, |
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get_request_dict, render_metadata, render_meta, api_method) |
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from synnefo.db.models import Image, ImageMetadata |
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from django.conf.urls.defaults import patterns |
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from django.http import HttpResponse |
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from django.template.loader import render_to_string |
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from django.utils import simplejson as json |
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urlpatterns = patterns('synnefo.api.images',
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(r'^(?:/|.json|.xml)?$', 'demux'), |
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(r'^/detail(?:.json|.xml)?$', 'list_images', {'detail': True}), |
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(r'^/(\d+)(?:.json|.xml)?$', 'image_demux'), |
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(r'^/(\d+)/meta(?:.json|.xml)?$', 'metadata_demux'), |
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(r'^/(\d+)/meta/(.+?)(?:.json|.xml)?$', 'metadata_item_demux'), |
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) |
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def demux(request): |
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if request.method == 'GET': |
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return list_images(request)
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elif request.method == 'POST': |
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return create_image(request)
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else:
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return method_not_allowed(request)
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def image_demux(request, image_id): |
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if request.method == 'GET': |
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return get_image_details(request, image_id)
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elif request.method == 'DELETE': |
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return delete_image(request, image_id)
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else:
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return method_not_allowed(request)
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def metadata_demux(request, image_id): |
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if request.method == 'GET': |
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return list_metadata(request, image_id)
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elif request.method == 'POST': |
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return update_metadata(request, image_id)
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else:
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return method_not_allowed(request)
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def metadata_item_demux(request, image_id, key): |
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if request.method == 'GET': |
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return get_metadata_item(request, image_id, key)
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elif request.method == 'PUT': |
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return create_metadata_item(request, image_id, key)
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elif request.method == 'DELETE': |
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return delete_metadata_item(request, image_id, key)
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else:
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return method_not_allowed(request)
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def image_to_dict(image, detail=True): |
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d = {'id': image.id, 'name': image.name} |
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if detail:
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d['updated'] = isoformat(image.updated)
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d['created'] = isoformat(image.created)
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d['status'] = image.state
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d['progress'] = 100 if image.state == 'ACTIVE' else 0 |
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if image.sourcevm:
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d['serverRef'] = image.sourcevm.id
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metadata = {} |
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for meta in ImageMetadata.objects.filter(image=image): |
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metadata[meta.meta_key] = meta.meta_value |
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if metadata:
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d['metadata'] = {'values': metadata} |
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return d
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def metadata_to_dict(image): |
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image_meta = image.imagemetadata_set.all() |
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return dict((meta.meta_key, meta.meta_value) for meta in image_meta) |
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@api_method('GET') |
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def list_images(request, detail=False): |
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# Normal Response Codes: 200, 203
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# Error Response Codes: computeFault (400, 500),
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# serviceUnavailable (503),
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# unauthorized (401),
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# badRequest (400),
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# overLimit (413)
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since = isoparse(request.GET.get('changes-since'))
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if since:
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avail_images = Image.objects.filter(owner=request.user, updated__gte=since) |
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if not avail_images: |
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return HttpResponse(status=304) |
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else:
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avail_images = Image.objects.filter(owner=request.user) |
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images = [image_to_dict(image, detail) for image in avail_images] |
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if request.serialization == 'xml': |
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data = render_to_string('list_images.xml', {'images': images, 'detail': detail}) |
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else:
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data = json.dumps({'images': {'values': images}}) |
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return HttpResponse(data, status=200) |
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@api_method('POST') |
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def create_image(request): |
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# Normal Response Code: 202
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# Error Response Codes: computeFault (400, 500),
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# serviceUnavailable (503),
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# unauthorized (401),
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# badMediaType(415),
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# itemNotFound (404),
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# badRequest (400),
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# serverCapacityUnavailable (503),
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# buildInProgress (409),
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# resizeNotAllowed (403),
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# backupOrResizeInProgress (409),
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# overLimit (413)
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req = get_request_dict(request) |
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try:
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d = req['image']
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server_id = d['serverRef']
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name = d['name']
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except (KeyError, ValueError): |
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raise BadRequest('Malformed request.') |
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owner = request.user |
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vm = get_vm(server_id, owner) |
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image = Image.objects.create(name=name, owner=owner, sourcevm=vm) |
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imagedict = image_to_dict(image) |
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if request.serialization == 'xml': |
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data = render_to_string('image.xml', {'image': imagedict}) |
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else:
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data = json.dumps({'image': imagedict})
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return HttpResponse(data, status=202) |
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@api_method('GET') |
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def get_image_details(request, image_id): |
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# Normal Response Codes: 200, 203
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# Error Response Codes: computeFault (400, 500),
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# serviceUnavailable (503),
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# unauthorized (401),
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# badRequest (400),
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# itemNotFound (404),
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# overLimit (413)
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image = get_image(image_id, request.user) |
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imagedict = image_to_dict(image) |
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if request.serialization == 'xml': |
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data = render_to_string('image.xml', {'image': imagedict}) |
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else:
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data = json.dumps({'image': imagedict})
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return HttpResponse(data, status=200) |
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@api_method('DELETE') |
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def delete_image(request, image_id): |
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# Normal Response Code: 204
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# Error Response Codes: computeFault (400, 500),
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# serviceUnavailable (503),
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# unauthorized (401),
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# itemNotFound (404),
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# overLimit (413)
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image = get_image(image_id, request.user) |
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image.delete() |
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return HttpResponse(status=204) |
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@api_method('GET') |
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def list_metadata(request, image_id): |
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# Normal Response Codes: 200, 203
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# Error Response Codes: computeFault (400, 500),
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# serviceUnavailable (503),
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# unauthorized (401),
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# badRequest (400),
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# overLimit (413)
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image = get_image(image_id, request.user) |
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metadata = metadata_to_dict(image) |
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return render_metadata(request, metadata, use_values=True, status=200) |
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@api_method('POST') |
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def update_metadata(request, image_id): |
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# Normal Response Code: 201
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# Error Response Codes: computeFault (400, 500),
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# serviceUnavailable (503),
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# unauthorized (401),
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# badRequest (400),
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# buildInProgress (409),
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# badMediaType(415),
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# overLimit (413)
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image = get_image(image_id, request.user) |
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req = get_request_dict(request) |
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try:
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metadata = req['metadata']
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assert isinstance(metadata, dict) |
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except (KeyError, AssertionError): |
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raise BadRequest('Malformed request.') |
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updated = {} |
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for key, val in metadata.items(): |
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try:
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meta = ImageMetadata.objects.get(meta_key=key, image=image) |
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meta.meta_value = val |
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meta.save() |
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updated[key] = val |
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except ImageMetadata.DoesNotExist:
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pass # Ignore non-existent metadata |
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if updated:
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image.save() |
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return render_metadata(request, updated, status=201) |
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@api_method('GET') |
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def get_metadata_item(request, image_id, key): |
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# Normal Response Codes: 200, 203
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# Error Response Codes: computeFault (400, 500),
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# serviceUnavailable (503),
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# unauthorized (401),
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# itemNotFound (404),
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# badRequest (400),
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# overLimit (413)
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image = get_image(image_id, request.user) |
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meta = get_image_meta(image, key) |
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return render_meta(request, meta, status=200) |
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@api_method('PUT') |
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def create_metadata_item(request, image_id, key): |
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# Normal Response Code: 201
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# Error Response Codes: computeFault (400, 500),
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# serviceUnavailable (503),
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# unauthorized (401),
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# itemNotFound (404),
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# badRequest (400),
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# buildInProgress (409),
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# badMediaType(415),
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# overLimit (413)
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image = get_image(image_id, request.user) |
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req = get_request_dict(request) |
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try:
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metadict = req['meta']
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assert isinstance(metadict, dict) |
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assert len(metadict) == 1 |
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assert key in metadict |
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except (KeyError, AssertionError): |
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raise BadRequest('Malformed request.') |
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meta, created = ImageMetadata.objects.get_or_create(meta_key=key, image=image) |
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meta.meta_value = metadict[key] |
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meta.save() |
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image.save() |
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return render_meta(request, meta, status=201) |
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@api_method('DELETE') |
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def delete_metadata_item(request, image_id, key): |
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# Normal Response Code: 204
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# Error Response Codes: computeFault (400, 500),
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# serviceUnavailable (503),
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# unauthorized (401),
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# itemNotFound (404),
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# badRequest (400),
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# buildInProgress (409),
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# badMediaType(415),
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# overLimit (413),
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image = get_image(image_id, request.user) |
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meta = get_image_meta(image, key) |
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meta.delete() |
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image.save() |
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return HttpResponse(status=204) |