• Keeps aspect ratio.
• Doesn't scale up, but scale down.
• Reflect orientation tag in EXIF of JPEG to pixels of resized image.
• Drops meta data.

Download binary for your environment from latest release, or go get like:

go get -u github.com/minodisk/resizer/...

resizer

• ENVIRONMENT: development or production. In default production
• GC_PROJECT_ID: The project ID of Google Cloud.
• GC_STORAGE_BUCKET: The bucket name of Google Cloud Storage.
• GC_SERVICE_ACCOUNT: The base64-encoded service account JSON of Google Cloud.
• MYSQL_DATA_SOURCE_NAME: The data source name of MySQL.
• ALLOWED_HOSTS: The allowed hosts of resizing images. Specified with a string joined by ,. When unspecified, resizer will resize images in any host.
• MAX_HTTP_CONNECTIONS

curl http://your.host.name/?url=http%3A%2F%2Fexample.com%2Fimage.jpeg&width=800

GET http://your.host.name/

• Joint key=value parameters with &.
  • The value should be URL-encoded.

The URL of a resizing image. Required. The host of the URL should be specified with hosts in running option.

The size of resized image in pixel. In default 0.

• An integer greater than or equal to 0.
• Specify 0 to both of width and height isn't allowed.
• When width is 0. width is guessed with height and the aspect ratio of the source image .
• When height is 0. height is guessed with width and the aspect ratio of the source image .
• The specified size is greater than the size of source image, resizer doesn't resize.

How to resize. contain or cover. Optional. In default contain.

• When width or height is 0, specified method is ignored and resizer resizes with contain method.
• When specifies contain, resizer resizes image to fall into the specified size and doesn't clip.
• When specifies cover, resizer resizes image to fill all pixels in the specified size and clips the outer of the specified size.

The format of the resized image. jpeg or png or gif. In default jpeg.

The quality of the resized image as jpeg. 0〜100. In default 100.

• Ignored, when format isn't jpeg.

• When resizes first time, response resized image data with the code as 2xx.
• When resizes second (or third or forth) time, response with code as 3xx and redirects to the storage URL of that the resized image was saved.

Response with the code as 4xx, and the reason will be written in the body.