Embed static assets

[karfianto]

in branch embedded-templates I'm just wondering, can I also embed static assets (js, css, png etc.) in static directory ? So I can distribute my binary without static folder

I've read https://github.com/elazarl/go-bindata-assetfs but still unable to make it works.

[josephspurrier]

Yes, you can embed all of those types of files by using the annotation:

// Assets represents the embedded files.
//go:embed *.tmpl pages/*.tmpl static/*.css static/*.png
var Assets embed.FS

Also, I put together a blog article around it: https://www.josephspurrier.com/how-to-embed-assets-in-go-1-16

[karfianto]

When we refer to existing base.tmpl

{{CSS "static/css/bootstrap.min.css"}}
{{CSS "//fonts.googleapis.com/css?family=Open+Sans:300,400,bold,italic"}}
{{CSS "static/css/global.css"}}

it calls static assets served by static controller

Should I make any change in the template in order to use the embedded css?

[josephspurrier]

Yes, you'll need to make changes to this function to support it: https://github.com/josephspurrier/gowebapp/blob/embedded-templates/app/controller/static.go.

I haven't tested this code, but this is probably how I would approach it:

package ambient

import (
	"bytes"
	"embed"
	"io/fs"
	"io/ioutil"
	"net/http"
	"path"
	"strings"
	"time"
)

// Assets represents the embedded files.
//go:embed static/css/*.css static/js/*.js
var Assets embed.FS

// Static maps static files
func Static(w http.ResponseWriter, r *http.Request) {
	// Disable listing directories
	if strings.HasSuffix(r.URL.Path, "/") {
		Error404(w, r)
		return
	}

	filepath := r.URL.Path

	// Determine if an embedded asset is available before service static file.
	fsys, err := fs.Sub(Assets, ".")
	if err == nil {
		// Open the file.
		f, err := fsys.Open(filepath)
		if err == nil {
			defer f.Close()

			// Get the contents.
			ff, err := ioutil.ReadAll(f)
			if err != nil {
				Error404(w, r)
				return
			}

			// Assets all have the same time so it's pointless to use the FS
			// ModTime.
			now := time.Now()

			http.ServeContent(w, r, path.Base(filepath), now, bytes.NewReader(ff))
			return
		}
	}

	http.ServeFile(w, r, r.URL.Path[1:])
}

You'll also need to make changes to this file: https://github.com/josephspurrier/gowebapp/blob/embedded-templates/app/shared/view/plugin/taghelper.go. I'd probably create new funcmap like CSSEMBED to handle without the timestamps.