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import contextlib
import tempfile
import boto3
import botocore.exceptions
from flask import request, send_file
from .base import BaseStorage
class Storage(BaseStorage):
def __init__(self, app):
super().__init__(app)
self.client = boto3.resource('s3', **self.app.config['S3_CONFIG'])
def _get_object_key(self, file_hash, user_id):
return '{}_{}'.format(file_hash, user_id)
def get_object_key(self, f, thumb=False):
key = self._get_object_key(f.hash, f.user_id if f.user_id else 0)
if thumb:
key += '_thumb'
return key
def upload_file(self, uploaded_file, file_hash, user):
bucket = self.client.Bucket(self.app.config['S3_BUCKET'])
key = self._get_object_key(file_hash, user.id if user else 0)
obj = bucket.upload_fileobj(Fileobj=uploaded_file.stream, Key=key)
size = uploaded_file.content_length
if not size:
obj = self.client.ObjectSummary(self.app.config['S3_BUCKET'], key)
size = obj.size
return obj, size
def store_file(self, uploaded_file, file_hash, user, ip):
obj, size = self.upload_file(uploaded_file, file_hash, user)
try:
return self.add_file(file_hash, uploaded_file.filename, size, user, ip)
except:
obj.delete()
raise
def file_exists(self, f):
key = self.get_object_key(f)
bucket = self.app.config['S3_BUCKET']
obj = self.client.Object(bucket, key)
try:
meta = obj.load()
return True
except botocore.exceptions.ClientError as e:
if e.response['Error']['Code'] == '404':
return False
raise
def get_file(self, f, thumb=False):
key = self.get_object_key(f, thumb=thumb)
if thumb:
bucket = self.app.config['S3_THUMB_BUCKET']
else:
bucket = self.app.config['S3_BUCKET']
obj = self.client.Object(bucket, key)
kwargs = {}
if 'Range' in request.headers:
kwargs['Range'] = request.headers['Range']
data = obj.get(**kwargs)
rv = send_file(data['Body'], attachment_filename=f.filename)
rv.headers['Content-Length'] = data['ContentLength']
rv.headers['Accept-Ranges'] = data['AcceptRanges']
if 'ContentRange' in data:
rv.headers['Content-Range'] = data['ContentRange']
rv.status_code = 206
return rv
def delete_file(self, f):
obj = self.client.Object(self.app.config['S3_BUCKET'], self.get_object_key(f))
obj.delete()
obj = self.client.Object(self.app.config['S3_BUCKET'], self.get_object_key(f, thumb=True))
obj.delete()
@contextlib.contextmanager
def temp_file(self, f):
obj = self.client.Object(self.app.config['S3_BUCKET'], self.get_object_key(f))
with tempfile.NamedTemporaryFile() as f:
obj.download_fileobj(f)
f.seek(0)
yield f
def get_thumbnail(self, f):
try:
return self.get_file(f, thumb=True)
except botocore.exceptions.ClientError as e:
if e.response['Error']['Code'] == 'NoSuchKey':
# If thumbnail does not exist, just return None.
return
raise
def store_thumbnail(self, f, stream):
bucket = self.client.Bucket(self.app.config['S3_THUMB_BUCKET'])
key = self.get_object_key(f, thumb=True)
obj = bucket.upload_fileobj(Fileobj=stream, Key=key)
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