def get(self, request, identifier, format=None):
params = WatermarkQueryStringSerializer(data=request.query_params)
if not params.is_valid():
return input_error_response()
try:
image_record = Image.objects.get(identifier=identifier)
except Image.DoesNotExist:
return Response(status=404, data='Not Found')
image_url = str(image_record.url)
image_info = {
'title': image_record.title,
'creator': image_record.creator,
'license': image_record.license,
'license_version': image_record.license_version
}
# Create the actual watermarked image.
watermarked, exif = watermark(
image_url, image_info, params.data['watermark']
)
# Re-insert EXIF metadata.
if exif:
exif_bytes = piexif.dump(exif)
else:
exif_bytes = None
img_bytes = io.BytesIO()
_save_wrapper(watermarked, exif_bytes, img_bytes)
if params.data['embed_metadata']:
# Embed ccREL metadata with XMP.
work_properties = {
'creator': image_record.creator,
'license_url': image_record.license_url,
'attribution': image_record.attribution,
'work_landing_page': image_record.foreign_landing_url,
'identifier': str(image_record.identifier)
}
try:
with_xmp = ccrel.embed_xmp_bytes(img_bytes, work_properties)
return FileResponse(with_xmp, content_type='image/jpeg')
except (libxmp.XMPError, AttributeError) as e:
# Just send the EXIF-ified file if libxmp fails to add metadata.
log.error(
'Failed to add XMP metadata to {}'
.format(image_record.identifier)
)
log.error(e)
response = HttpResponse(content_type='image/jpeg')
_save_wrapper(watermarked, exif_bytes, response)
return response
else:
response = HttpResponse(img_bytes, content_type='image/jpeg')
_save_wrapper(watermarked, exif_bytes, response)
return response
def get(self, request, identifier, format=None):
try:
image_record = Image.objects.get(identifier=identifier)
except Image.DoesNotExist:
return Response(status=404, data='Not Found')
image_url = str(image_record.url)
image_info = {
'title': image_record.title,
'creator': image_record.creator,
'license': image_record.license,
'license_version': image_record.license_version
}
# Create the actual watermarked image.
watermarked, exif = watermark(image_url, image_info)
# Re-insert EXIF metadata.
exif_bytes = piexif.dump(exif)
img_bytes = io.BytesIO()
watermarked.save(img_bytes, 'jpeg', exif=exif_bytes)
# Embed ccREL metadata with XMP.
work_properties = {
'creator': image_record.creator,
'license_url': image_record.license_url,
'attribution': image_record.attribution,
'work_landing_page': image_record.foreign_landing_url,
'identifier': str(image_record.identifier)
}
try:
with_xmp = ccrel.embed_xmp_bytes(img_bytes, work_properties)
return FileResponse(with_xmp, content_type='image/jpeg')
except (libxmp.XMPError, AttributeError) as e:
# Just send the EXIF-ified file if libxmp fails to add metadata.
log.error('Failed to add XMP metadata to {}'.format(
image_record.identifier))
log.error(e)
response = HttpResponse(content_type='image/jpeg')
watermarked.save(response, 'jpeg', exif=exif_bytes)
return response