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How do you set content type on a file in a webhosting-enabled S3 account via the Python boto module?
I'm doing:
from boto.s3.connection import S3Connection
from boto.s3.key import Key
from boto.cloudfront import CloudFrontConnection
conn = S3Connection(access_key_id, secret_access_key)
bucket = conn.create_bucket('mybucket')
b = conn.get_bucket(bucket)
b.set_acl('public-read')
fn = 'index.html'
template = '<html>blah</html>'
k = Key(b)
k.key = fn
k.set_contents_from_string(template)
k.set_acl('public-read')
k.set_metadata('Content-Type', 'text/html')
However, when I access it from http://mybucket.s3-website-us-east-1.amazonaws.com/index.html my browser prompts me to download the file instead of simply serving it as a webpage.
Looking at the metadata in the S3 Management console shows the Content-Type has actually been set to "application/octet-stream". If I manually change it in the console, I can access the page normally, but if I run my script again, it resets it back to the wrong content type.
What am I doing wrong?
731
The set_metadata method is really for setting user metadata on S3 objects. Many of the standard HTTP metadata fields have first class attributes to represent them, e.g. content_type. Also, you want to set the metadata before you actually send the object to S3. Something like this should work:
import boto
conn = boto.connect_s3()
bucket = conn.get_bucket('mybucket') # Assumes bucket already exists
key = bucket.new_key('mykey')
key.content_type = 'text/html'
key.set_contents_from_string(mystring, policy='public-read')
Note that you can set canned ACL policies at the time you write the object to S3 which saves having to make another API call.
146
For people who need one-liner for this,
import boto3
s3 = boto3.resource('s3')
s3.Bucket('bucketName').put_object(Key='keyName', Body='content or fileData', ContentType='contentType', ACL='check below')
Supported ACL values:
'private'|'public-read'|'public-read-write'|'authenticated-read'|'aws-exec-read'|'bucket-owner-read'|'bucket-owner-full-control'
Arguments supported by put_object can be found here, https://boto3.readthedocs.io/en/latest/reference/services/s3.html#S3.Client.put_object
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