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csp.go
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/
csp.go
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package main
import (
"net/http"
)
const (
cspHeader = "Content-Security-Policy"
rpHeader = "Referrer-Policy"
frameOptionsHeader = "X-Frame-Options"
)
type csp struct {
h http.Handler
opts CSPOptions
}
type CSPOptions struct {
policy string
referrerPolicy string
frame string
}
func (c csp) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// only add a CSP if one is not already set
if existing := w.Header().Get(cspHeader); existing == "" {
w.Header().Add(cspHeader, c.opts.policy)
}
// only add a Referrer Policy if one is not already set
if existing := w.Header().Get(rpHeader); existing == "" {
w.Header().Add(rpHeader, c.opts.referrerPolicy)
}
w.Header().Set(frameOptionsHeader, c.opts.frame)
c.h.ServeHTTP(w, r)
}
func ContentSecurityPolicy(o CSPOptions) func(http.Handler) http.Handler {
fn := func(h http.Handler) http.Handler {
return csp{h, o}
}
return fn
}