AWS Serverless Image Handler Lambda wrapper for Thumbor

A solution to dynamically handle images on the fly, utilizing Thumbor (thumbor.org). Published version, additional details and documentation are available here: https://aws.amazon.com/answers/web-applications/serverless-image-handler/

Note: it is recommend to build the application binary on Amazon Linux.

Running unit tests for customization

• Clone the repository, then make the desired code changes
• Next, run unit tests to make sure added customization passes the tests

cd ./deployment
chmod +x ./run-unit-tests.sh  \n
./run-unit-tests.sh \n

Building distributable for customization

• Configure the bucket name of your target Amazon S3 distribution bucket

export TEMPLATE_OUTPUT_BUCKET=my-bucket-name # bucket where cfn template will reside
export DIST_OUTPUT_BUCKET=my-bucket-name # bucket where customized code will reside
export VERSION=my-version # version number for the customized code

Note: You would have to create 2 buckets, one named 'my-bucket-name' and another regional bucket named 'my-bucket-name-<aws_region>'; aws_region is where you are testing the customized solution. Also, the assets in bucket should be publicly accessible.

• OS/Python Environment Setup

yum install yum-utils epel-release -y
sudo yum-config-manager --enable epel
sudo yum update -y
sudo yum install zip wget git libpng-devel libcurl-devel gcc python-devel libjpeg-devel -y
alias sudo='sudo env PATH=$PATH'
sudo pip install setuptools==39.0.1
sudo pip install virtualenv==15.2.0

• Clone the github repo

git clone https://github.com/awslabs/serverless-image-handler.git

• Navigate to the deployment folder

cd serverless-image-handler/deployment

• Now build the distributable

sudo ./build-s3-dist.sh $DIST_OUTPUT_BUCKET $VERSION

• Deploy the distributable to an Amazon S3 bucket in your account. Note: you must have the AWS Command Line Interface installed.

aws s3 cp ./dist/ s3://$DIST_OUTPUT_BUCKET-[region_name]/serverless-image-handler/$VERSION/ --recursive --exclude "*" --include "*.zip"
aws s3 cp ./dist/serverless-image-handler.template s3://$TEMPLATE_OUTPUT_BUCKET/serverless-image-handler/$VERSION/

Note: In the above example, the solution template will expect the source code to be located in the my-bucket-name-[region_name] with prefix serverless-image-handler/my-version/serverless-image-handler.zip

• Get the link of the serverless-image-handler.template uploaded to your Amazon S3 bucket.
• Deploy the Serverless Image Handler solution to your account by launching a new AWS CloudFormation stack using the link of the serverless-image-handler.template

https://s3.amazonaws.com/my-bucket-name/serverless-image-handler/my-version/serverless-image-handler.template

SafeURL hash calculation

• For hash calculation with safe URL, use following snippet to find signed_path value

http_key='mysecuritykey' # security key provided to lambda env variable
http_path='200x200/smart/sub-folder/myimage.jpg' # sample options for myimage
hashed = hmac.new(str(http_key),str(http_path),sha1)
encoded = base64.b64encode(hashed.digest())
signed_path = encoded.replace('/','_').replace('+','-')

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Licensed under the Amazon Software License (the "License"). You may not use this file except in compliance with the License. A copy of the License is located at

http://aws.amazon.com/asl/

or in the "license" file accompanying this file. This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, express or implied. See the License for the specific language governing permissions and limitations under the License.