github.com/shogo82148/go-imageflux

go-imageflux

URL builder and parser for ImageFlux.

Usage

ImageFlux is Image Conversion & Distribution Engine. This allows you to easily generate images optimized for each device based on a single source image, and delivers them quickly and with high quality.

The imageflux package builds and parse URLs for ImageFlux.

Build URL

In ImageFlux, parameters for image transformation are embedded in the URL.

proxy := &imageflux.Proxy{
    Host: "demo.imageflux.jp",
}
cfg := &imageflux.Config{
    // resize the image to 200px width.
    Width: 200,

    // convert the image to WebP format.
    Format: imageflux.FormatWebPAuto,
}
u := proxy.Image("/images/1.jpg", cfg).SignedURL()
fmt.Println(u)

// Output:
// https://demo.imageflux.jp/c/w=200,f=webp:auto/images/1.jpg

Build Signed URL

By attaching a signature to the transformation parameters, it prevents third parties from rewriting the URL.

proxy := &imageflux.Proxy{
    Host:   "demo.imageflux.jp",
    Secret: "testsigningsecret",
}
cfg := &imageflux.Config{
    // resize the image to 200px width.
    Width: 200,
}
u := proxy.Image("/images/1.jpg", cfg).SignedURL()
fmt.Println(u)

// Output:
// https://demo.imageflux.jp/c/sig=1.tiKX5u2kw6wp9zDgl1tLiOIi8IsoRIBw8fVgVc0yrNg=,w=200/images/1.jpg

Parse URL

proxy := &imageflux.Proxy{}
image, err := proxy.Parse("/c/w=200/images/1.jpg", "")
if err != nil {
    log.Fatal(err)
}
fmt.Printf("path = %s\n", image.Path)
fmt.Printf("width = %d\n", image.Config.Width)

// Output:
// path = /images/1.jpg
// width = 200

References

• ImageFlux (written in Japanese)
• The document of ImageFlux (written in Japanese)