问题
What I want to accomplish is to generate a link to view the file (ex.image or pdf). The item is not accessible by URL (https://[bucket].s3.amazonaws.com/img_name.jpg), I think because its private and not public? (I'm not the owner of the bucket, but he gave me the access_key and secret_key?)
For now, all I can do is to download a file with this code.
s3.Bucket('mybucket').download_file('upload/nocturnes.png', 'dropzone/static/pdf/download_nocturnes.png')
I want to access an image on s3 so I can put it on an HTML, can I view it using the access and secret key?. Thank you for those who can help!
回答1:
You can accomplish this using a pre-signed URL using the generate_presigned_url function. The caveat is that pre-signed URLs must have an expiration date. I was unable to find documentation on the maximum allowed duration. Here is an example:
url = s3.generate_presigned_url('get_object',
Params={
'Bucket': 'mybucket',
'Key': 'upload/nocturnes.png',
},
ExpiresIn=3600)
print url
回答2:
For people who want to use generate_presigned_url for a public object and therefore don't want to do the signing part that appends credentials, the best solution I found is to still to use the generate_presigned_url, just that the Client.Config.signature_version needs to be set to botocore.UNSIGNED.
The following returns the public link without the signing stuff.
config.signature_version = botocore.UNSIGNED
boto3.client('s3', config=config).generate_presigned_url('get_object', ExpiresIn=0, Params={'Bucket': bucket, 'Key': key})
The relevant discussions on the boto3 repository are:
- https://github.com/boto/boto3/issues/110
- https://github.com/boto/boto3/issues/169
- https://github.com/boto/boto3/issues/1415
来源：https://stackoverflow.com/questions/43973658/how-to-access-image-by-url-on-s3-using-boto3