64 lines
1.9 KiB
Python
64 lines
1.9 KiB
Python
import re
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import uuid
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import boto3
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from flask import current_app
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IMAGE_MIME_TYPES = set(['image/png', 'image/jpg', 'image/gif'])
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AVATAR_MAX_SIZE = 2 * 1024 * 1024 # 2MB
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class AvatarException(Exception):
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pass
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def allowed_avatar_type(mimetype):
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if mimetype not in IMAGE_MIME_TYPES:
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raise AvatarException("Unacceptable file type: {0}".format(mimetype))
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return True
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def extract_avatar_filename(url):
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match = re.search(r'avatars/(\d+\.\w+\.\w+)$', url)
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if match:
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return match.group(1)
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else:
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raise AvatarException("Unable to extract avatar filename from %s" % url)
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def construct_avatar_url(filename):
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S3_BUCKET = current_app.config['S3_BUCKET']
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return "https://%s.s3.amazonaws.com/avatars/%s" % (S3_BUCKET, filename)
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def remove_avatar(url, user_id):
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S3_BUCKET = current_app.config['S3_BUCKET']
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filename = extract_avatar_filename(url)
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user_match = re.search(r'^(\d+)\.\w+\.\w+$', filename)
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if user_match and user_match.group(1) == str(user_id):
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s3 = boto3.resource('s3')
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s3.Object(S3_BUCKET, 'avatars/' + filename).delete()
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def sign_avatar_upload(mimetype, user_id):
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S3_BUCKET = current_app.config['S3_BUCKET']
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if mimetype and allowed_avatar_type(mimetype):
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ext = mimetype.replace('image/', '')
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filename = "{0}.{1}.{2}".format(user_id, uuid.uuid4().hex, ext)
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key = "avatars/" + filename
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s3 = boto3.client('s3')
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presigned_post = s3.generate_presigned_post(
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Bucket=S3_BUCKET,
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Key=key,
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Fields={"acl": "public-read", "Content-Type": mimetype},
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Conditions=[
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{"acl": "public-read"},
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{"Content-Type": mimetype},
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["content-length-range", 0, AVATAR_MAX_SIZE]
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],
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ExpiresIn=3600
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)
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return {
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"data": presigned_post,
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"url": construct_avatar_url(filename)
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}
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