@resourcefulhumans/rheactor-image-service
v3.1.0
Published
An image processing backend running on AWS Lambda.
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rheactor-image-service
An image processing backend running on AWS Lambda.
Uses gm with GraphicsMagick (which is available by default) on AWS lambda.
It takes JPEG or PNG images that are uploaded base64 encoded, crops and resizes them on the fly to 256x256px size, and stores them on an S3 bucket.
| Original | Result | |:--------:|:-------:| | | | | JPEG | JPEG | | 600x300 | 256x256 | | | | | PNG | JPEG | | 600x300 | 256x256 | | | | | JPEG | JPEG | | 300x600 | 256x256 |
Request
Users need to provide an JsonWebToken which is checked against the configured public key.
POST /upload
Content-Type: application/vnd.resourceful-humans.rheactor-image-service.v1+json
Authorization: Bearer <token>
{
"$context":"https://github.com/ResourcefulHumans/rheactor-image-service#Upload",
"image":"R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7",
"mimeType":"image/png"
}
Response
Content-Type: application/vnd.resourceful-humans.rheactor-image-service.v1+json
{
"$context":"https://github.com/ResourcefulHumans/rheactor-image-service#UploadResult",
"url":"https://s3.eu-central-1.amazonaws.com/rheactor-image-service/example.com/33f24f55-e435-4198-a148-fdd1095ffa96-user-5.jpg",
"mimeType":"image/jpeg"
}
This implementation expects token's sub
to be an URL, which will be used to prefix and suffix URLs.
A sub
value of https://example.com/user/5
was used in the example above.
Configuration
These environment variables need to be set on the lambda function:
S3_BUCKET
Name of the S3 bucket, e.g.rheactor-image-service
to where files are uploaded.S3_REGION
Region to use.MOUNT_URL
Public endpoint for the lamba function (as provided by API Gateway)WEB_LOCATION
Public URL for the bucketPUBLIC_KEY_FILE
Public key file in the bucket to be used for verifying tokens
Setup
npm install
# Configure these environment variables
AWS_ROLE=…
AWS_ACCESS_KEY_ID=…
AWS_SECRET_ACCESS_KEY=…
AWS_REGION=…
AWS_FUNCTION_NAME=…
NODE_ENV=…
VERSION=…
# install this as a new lambda function
make install
Local testing
For local testing use AWS SAM CLI.
It has docker as a dependency. To start local testing run sam local start-api
command. It will read template.yml
and create local container with built function.
It is required to build the project first - all files must be in build folder.
Because lambda function is not setting any additional CORS headers, easiest way is to use nginx to append them. Config for that is included in repo.