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package server
import (
"fmt"
"html/template"
"io/ioutil"
"github.com/valyala/fasthttp"
"github.com/authelia/authelia/internal/logging"
"github.com/authelia/authelia/internal/utils"
)
var alphaNumericRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
// ServeIndex serve the index.html file with nonce generated for supporting
// restrictive CSP while using material-ui from the embedded virtual filesystem.
//go:generate broccoli -src ../../public_html -o public_html
func ServeIndex(publicDir string) fasthttp.RequestHandler {
f, err := br.Open(publicDir + "/index.html")
if err != nil {
logging.Logger().Fatalf("Unable to open index.html: %v", err)
}
b, err := ioutil.ReadAll(f)
if err != nil {
logging.Logger().Fatalf("Unable to read index.html: %v", err)
}
tmpl, err := template.New("index").Parse(string(b))
if err != nil {
logging.Logger().Fatalf("Unable to parse index.html template: %v", err)
}
return func(ctx *fasthttp.RequestCtx) {
nonce := utils.RandomString(32, alphaNumericRunes)
ctx.SetContentType("text/html; charset=utf-8")
ctx.Response.Header.Add("Content-Security-Policy", fmt.Sprintf("default-src 'self'; style-src 'self' 'nonce-%s'", nonce))
err := tmpl.Execute(ctx.Response.BodyWriter(), struct{ CSPNonce string }{CSPNonce: nonce})
if err != nil {
ctx.Error("An error occurred", 503)
logging.Logger().Errorf("Unable to execute template: %v", err)
return
}
}
}
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