aws-lambda-image

An AWS Lambda Function to resize/reduce images automatically. When an image is put on AWS S3 bucket, this package will resize/reduce it and put to S3.

Requirements

• node.js ( AWS Lambda working version is 4.3.2 )
• make

Installation

Clone this repository and install dependencies:

$ git clone git@github.com:ysugimoto/aws-lambda-image.git
$ cd aws-lambda-image
$ npm install .

Packaging

AWS Lambda accepts zip archived package. To create it, run make lambda task simply.

$ make lambda

It will create aws-lambda-image.zip at project root. You can upload it.

Configuration

This works with config.json put on project root. There is config.json.sample as example. You can copy to use it.

$ cp config.json.sample config.json

Configuration is simple, see below:

{
"bucket": "your-destination-bucket",
"reduce": {
"directory": "reduced",
"quality": 90
},
"resizes": [
{
"size": 300,
"directory": "resized/small"
},
{
"size": 600,
"directory": "resized/middle"
},
{
"size": 900,
"directory": "resized/large"
}
]
}

• bucket: [String] Destination bucket name at S3 to put processed image. If not supplied, it will use same bucket of event source.
• reduce: [Object] Reduce setting.
  • directory: [String] Image directory path.
  • bucket: [Object] Destination bucket to override. If not supplied, it will use bucket setting.
  • quality: [Number] Determine reduced image quality ( enables only JPG ).
• resizes: [Array] Resize setting.
  • size: [Number] Image width.
  • directory: [String] Image directory path.
  • bucket: [Object] Destination bucket to override. If not supplied, it will use bucket setting.
  • quality: [Number] Determine reduced image quality ( enables only JPG ).

If you want to check how this works with your configuration, you can use configtest:

$ make configtest

Complete / Failed hooks

You can handle resize/reduce process on success/error result on index.js. ImageProcessor::run will return Promise object, run your original code:

processor.run(config).then(function(proceedImages)){// Success case:// proceedImages is list of ImageData instance on you configuration/* your code here */// notify lambdacontext.succeed("OK, numbers of "+proceedImages.length+" images has proceeded.");}).catch(function(messages){// Failed case:// messages is list of string on error messages/* your code here */// notify lambdacontext.fail("Woops, image process failed: "+messages);});

Image resize

• ImageMagick (installed on AWS Lambda)

Image reduce

• cjpeg
• pngquant
• pngout

License

MIT License.

Author

Yoshiaki Sugimoto

Image credits

Thanks for testing fixture images:

• http://pngimg.com/
• https://www.pakutaso.com/