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#1 Posted : Tuesday, December 7, 2010 10:53:22 PM(UTC)

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Some of our users use Image Uploader to upload files to Amazon S3 storage, and ask us how to set content-type for these files. It is very simple.

To specify content-type value for uploaded files, you should add it using addCustomField(String,String) method:


// Add Content-Type value for uploaded images
uploader.metadata().addCustomField('Content-Type', 'image/jpeg');

Also you need to add specified content type to AWS policy. In our sample applications the code which generates these policies is located in the \ASP.NET\Samples_ImageUploaderAspNet\App_Code\AmazonS3Helper.cs file. You will need to add content type to ConstructPolicy method:


private static string ConstructPolicy(string bucket, DateTime expirationDate, string acl, string key)
		// See about policy construction 
		// http://docs.amazonwebservices.com/AmazonS3/2006-03-01/dev/HTTPPOSTForms.html#HTTPPOSTConstructPolicy	

		string policy = string.Format(@"
			{{ 'expiration': '{0}.000Z',
				'conditions': [
					{{ 'acl': '{1}' }},
					{{ 'bucket': '{2}' }},
					{{ 'success_action_status': '200' }},
					[ 'starts-with', '$key', '' ],
					[ 'starts-with', '$Content-Type', '' ],
			}}", expirationDate.ToString("s"), acl, bucket);

		// Encode the policy using UTF-8.
		byte[] pb = System.Text.Encoding.UTF8.GetBytes(policy.ToString());

		// Encode those UTF-8 bytes using Base64 and return.
		return Convert.ToBase64String(pb);

The complete ASP.NET sample application demonstrating how to set content-type is attached to this post.

P.S. If you use PHP, please let us know, and we will assist you in timely manner.

Edited by user Thursday, April 7, 2011 8:07:26 PM(UTC)  | Reason: Not specified

File Attachment(s):
iu7_AmazonS3.zip (2,413kb) downloaded 41 time(s).
Best regards,

Dmitry Obukhov

Technical Support. Aurigma, Inc.

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