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Get a s3 signature for Ruby (used in ROR here) and how to set an image uploader using s3
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| class AmazonService | |
| class << self | |
| def get_s3_upload_key(user_folder, project_folder) | |
| bucket = < TO FILL > | |
| access_key = < TO FILL > | |
| secret_key = < TO FILL > | |
| env = ENV["S3_ENV"] | |
| key = "#{env}/#{user_folder}/#{project_folder}/" | |
| expiration = 1.days.from_now.utc.strftime('%Y-%m-%dT%H:%M:%S.000Z') | |
| max_filesize = 16.megabytes | |
| acl = 'public-read' | |
| region = 'eu-west-2' | |
| date = Time.now.utc.strftime('%Y%m%d') | |
| x_amz_credential = "#{access_key}/#{date}/#{region}/s3/aws4_request" | |
| x_amz_date = Time.now.utc.strftime('%Y%m%dT%H%M%S000Z') | |
| service = 's3' | |
| policy = { | |
| 'expiration' => expiration, | |
| 'conditions' => [ | |
| {'bucket' => bucket}, | |
| ['starts-with', '$key', key], | |
| {'acl' => acl}, | |
| {'success_action_redirect' => '< TO FILL >'}, | |
| {'Cache-Control' => 'max-age=31536000'}, | |
| {'x-amz-meta-uuid' => '14365123651274'}, | |
| {'x-amz-server-side-encryption' => 'AES256'}, | |
| ['starts-with', '$x-amz-meta-tag', 'test'], | |
| ['starts-with', '$Content-Type', 'image/jpeg'], | |
| ["starts-with", "$key", "#{env}/user_test/project_test/"], | |
| ['content-length-range', 1, max_filesize], | |
| {'x-amz-credential' => x_amz_credential}, | |
| {'x-amz-algorithm' => 'AWS4-HMAC-SHA256'}, | |
| {'x-amz-date' => x_amz_date} | |
| ] | |
| } | |
| policy = Base64.encode64(policy.to_json).gsub(/\n|\r/, '') | |
| signature = AmazonS3Service.get_signature_key(secret_key, date, region, service, policy) | |
| { | |
| :access_key => access_key, | |
| :key => key, | |
| :policy => policy, | |
| :signature => signature, | |
| :bucket => bucket, | |
| :acl => acl, | |
| :x_amz_credential => x_amz_credential, | |
| :x_amz_date => x_amz_date, | |
| :expiration => expiration | |
| } | |
| end | |
| def get_signature_key(secred_key, date_stamp, region_name, service_name, policy) | |
| k_date = OpenSSL::HMAC.digest('sha256', "AWS4" + secred_key, date_stamp) | |
| k_region = OpenSSL::HMAC.digest('sha256', k_date, region_name) | |
| k_service = OpenSSL::HMAC.digest('sha256', k_region, service_name) | |
| k_signing = OpenSSL::HMAC.digest('sha256', k_service, "aws4_request") | |
| OpenSSL::HMAC.hexdigest('sha256', k_signing, policy) | |
| end | |
| end | |
| end |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>test</title> | |
| </head> | |
| <body> | |
| <form action="< YOUR BUCKET >.s3.amazonaws.com/" method="post" enctype="multipart/form-data"> | |
| Key to upload: | |
| <input type="input" name="key" value="development/user_test/project_test/${filename}" /><br /> | |
| <input type="hidden" name="acl" value="public-read" /> | |
| <input type="hidden" name="success_action_redirect" value="< TO FILL >" /> | |
| Content-Type: | |
| <input type="input" name="Content-Type" value="image/jpeg" /><br /> | |
| <input type="input" name="Cache-Control" value="max-age=31536000" /><br /> | |
| <input type="hidden" name="x-amz-meta-uuid" value="14365123651274" /> | |
| <input type="hidden" name="x-amz-server-side-encryption" value="AES256" /> | |
| <input type="text" name="X-Amz-Credential" value="< TO FILL >" /> | |
| <input type="text" name="X-Amz-Algorithm" value="AWS4-HMAC-SHA256" /> | |
| <input type="text" name="X-Amz-Date" value="< TO FILL >" /> | |
| Tags for File: | |
| <input type="input" name="x-amz-meta-tag" value="< TO FILL >" /><br /> | |
| <input type="hidden" name="Policy" value='< TO FILL >' /> | |
| <input type="hidden" name="X-Amz-Signature" value="< TO FILL >" /> | |
| File: | |
| <input type="file" name="file" /> <br /> | |
| <!-- The elements after this will be ignored --> | |
| <input type="submit" name="submit" value="Upload to Amazon S3" /> | |
| </form> | |
| </body> | |
| </html> |
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According to this:
http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-post-example.html
http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-HTTPPOSTConstructPolicy.html
http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-authentication-HTTPPOST.html
http://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-HTTPPOSTForms.html