Contains the Concourse pipeline definition for building a line-server container
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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 }
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