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azure.py
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azure.py
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import base64
from azure.storage.blob import BlobServiceClient, ContentSettings, BlobPrefix
from django.conf import settings
from django.core.files.base import ContentFile
from django.http import StreamingHttpResponse
from pydash import get
from core.services.storages.cloud.core import CloudStorageServiceInterface
class BlobStorage(CloudStorageServiceInterface):
def __init__(self):
super().__init__()
self.account_name = settings.AZURE_STORAGE_ACCOUNT_NAME
self.container_name = settings.AZURE_STORAGE_CONTAINER_NAME
self.connection_string = settings.AZURE_STORAGE_CONNECTION_STRING
self.client = self.__get_container_client()
def public_url_for(self, file_path):
return f"https://{self.account_name}.blob.core.windows.net/{self.container_name}/{file_path}"
def url_for(self, file_path):
return self.public_url_for(file_path)
def exists(self, key):
try:
self.__get_blob_client(key).get_blob_properties()
return True
except: # pylint: disable=bare-except
return False
def has_path(self, prefix='/', delimiter='/'):
try:
blobs = self._fetch_blobs(prefix, delimiter)
return any(blob.name.startswith(prefix) for blob in blobs if not isinstance(blob, BlobPrefix))
except: # pylint: disable=bare-except
return False
def get_last_key_from_path(self, prefix='/', delimiter=''):
try:
if delimiter and not prefix.endswith(delimiter):
prefix = prefix + delimiter
blobs = self._fetch_blobs(prefix, delimiter)
blob_names = [[blob.name, blob.last_modified] for blob in blobs if not isinstance(blob, BlobPrefix)]
return sorted(
blob_names, key=lambda x: x[1], reverse=True)[0][0] if len(blob_names) > 1 else blob_names[0][0]
except: # pylint: disable=bare-except
return None
def delete_objects(self, path):
count_deleted = 0
try:
for blob in self._fetch_blobs(path, ''):
if not isinstance(blob, BlobPrefix):
self._remove(blob.name)
count_deleted += 1
return count_deleted
except: # pylint: disable=bare-except
return count_deleted
def remove(self, key):
try:
return self._remove(key)
except: # pylint: disable=bare-except
pass
return None
def upload_file(self, key, file_path=None, headers=None, binary=False, metadata=None): # pylint: disable=too-many-arguments
return self._upload(
blob_name=key,
file_path=file_path or key,
read_directive='rb' if binary else 'r',
metadata=headers or metadata
)
def upload_base64( # pylint: disable=too-many-arguments,inconsistent-return-statements
self, doc_base64, file_name, append_extension=True, public_read=False, headers=None
):
_format = None
_doc_string = None
try:
_format, _doc_string = doc_base64.split(';base64,')
except: # pylint: disable=bare-except # pragma: no cover
pass
if not _format or not _doc_string: # pragma: no cover
return
if append_extension:
file_name_with_ext = file_name + "." + _format.split('/')[-1]
else:
if file_name and file_name.split('.')[-1].lower() not in [
'pdf', 'jpg', 'jpeg', 'bmp', 'gif', 'png'
]:
file_name += '.jpg'
file_name_with_ext = file_name
self._upload(
blob_name=file_name_with_ext,
file_content=ContentFile(base64.b64decode(_doc_string)),
metadata=headers
)
return file_name_with_ext
def get_object(self, key):
return self.__get_blob_client(key)
@staticmethod
def file_iterator(blob_client):
stream = blob_client.download_blob()
data = stream.readall()
yield data
def get_streaming_response(self, key):
blob_client = self.get_object(key)
blob_properties = blob_client.get_blob_properties()
response = StreamingHttpResponse(
self.file_iterator(blob_client),
content_type=blob_properties.content_settings.content_type
)
response['Content-Disposition'] = f'attachment; filename={key.split("/")[-1]}'
return response
# private
def _upload(self, blob_name, file_content=None, file_path=None, read_directive=None, metadata=None): # pylint: disable=too-many-arguments
if not file_path and not file_content:
return None
try:
content_settings = ContentSettings(content_type='application/octet-stream')
content_type = get(metadata, 'content-type') or get(metadata, 'ContentType')
if content_type and 'application/' in content_type:
content_settings.content_encoding = content_type.split('application/')[1]
blob_client = self.__get_blob_client(blob_name)
if file_content:
self.__upload_content(blob_client, content_settings, file_content)
else:
with open(file_path, read_directive or 'r') as data:
self.__upload_content(blob_client, content_settings, data)
return blob_client.url
except: # pylint: disable=bare-except
return None
def _fetch_blobs(self, prefix, delimiter):
if delimiter and prefix.endswith(delimiter):
prefix = prefix[:-1]
return self.client.walk_blobs(name_starts_with=prefix, delimiter=delimiter)
def _remove(self, blob_name):
return self.__get_blob_client(blob_name).delete_blob()
@staticmethod
def __upload_content(blob_client, content_settings, file_content):
blob_client.upload_blob(data=file_content, content_settings=content_settings, overwrite=True)
def __get_blob_client(self, blob_name):
return self.client.get_blob_client(blob=blob_name)
def __get_container_client(self):
try:
return BlobServiceClient.from_connection_string(
conn_str=self.connection_string
).get_container_client(self.container_name)
except: # pylint: disable=bare-except
return None