polds / imgbase64

Go Library for base64 encoding an image

imgbase64

Convert an image to its base64 equivalent. API Documentation on go.pkgdoc.org.

Features

• Fetch an image from an external server and convert to base64
• Use an image on your local machine to convert to base64
• Share a bytes.Buffer to the package to detect the mime type and convert the image to base64
• Ability to set a failover image if desired image throws an error or does not exist.
• Automatically converts urls with " " to %20. Note: If your target domain uses +, _, etc. for space indicators it is your responsibility to modify the url accordingly.
• Correctly sets the base64 encoding type to the media type of the image. Example: data:image/jpeg;base64
• Returned image is ready to be used

Installation

go get github.com/polds/imgbase64

Usage

imgbase64.SetDefaultImage("http://yourdomain.com/defaultimage.png") // Optional - If FromRemote fails it will return " "

// Fetch the image from a remote server
img := imgbase64.FromRemote("http://somedomain.com/animage.jpg")

// Use an image local to machine
img := imgbase64.FromLocal("test.png")

// Pass an image buffer to package
img := imgbase64.FromBuffer(b)

Notes

• Please make sure your Default Image is a working image url. If your Default Image fails to load the package will panic(). This was deliberate.
• FromLocal has several instances where it might panic(), these are deliberate.

Todo

• Better error detection. Websites with custom 404 pages will sometimes "succeed" as being images and the package will base64 the html content of that page.
• Ability to use local images to convert to base64
• Cache the Default Image only once during the lifetime of the application. Presently every failed image is repulled.
• Deprecate NewImage
• Allow use of DefaultImage with FromBuffer and FromLocal

Change Log

October 24, 2013

• ADD: FromLocal - Allows you to base64 encode local images
• ADD: FromBuffer - Allows you to base64 encode from a byte.Buffer
• CHANGE: Rename function NewImage to FromRemote, please update accordingly. Will remove NewImage in future commits.
• ADD: Examples

This is my first package in Go. Suggestions or comments please tweet @Peter_Olds