Merge pull request from GHSA-2hfj-cxw7-g45p

controllers/index.go

@@ -68,8 +68,8 @@ func IndexHandler(w http.ResponseWriter, r *http.Request) {
 	// Set a cache control max-age header
 	middleware.SetCachingHeaders(w, r)
 
-	// Opt-out of Google FLoC
-	middleware.DisableFloc(w)
+	// Set our global HTTP headers
+	middleware.SetHeaders(w)
 
 	http.ServeFile(w, r, path.Join(config.WebRoot, r.URL.Path))
 }

router/middleware/disableFloc.go

@@ -1,8 +0,0 @@
-package middleware
-
-import "net/http"
-
-// DisableFloc will tell Google to not use this response in their FLoC tracking.
-func DisableFloc(w http.ResponseWriter) {
-	w.Header().Set("Permissions-Policy", "interest-cohort=()")
-}

router/middleware/headers.go

@@ -0,0 +1,19 @@
+package middleware
+
+import (
+	"net/http"
+	"strings"
+)
+
+// SetHeaders will set our global headers for web resources.
+func SetHeaders(w http.ResponseWriter) {
+	// Tell Google to not use this response in their FLoC tracking.
+	w.Header().Set("Permissions-Policy", "interest-cohort=()")
+
+	// Content security policy
+	csp := []string{
+		"script-src 'self' 'sha256-2HPCfJIJHnY0NrRDPTOdC7AOSJIcQyNxzUuut3TsYRY='",
+		"worker-src 'self' blob:", // No single quotes around blob:
+	}
+	w.Header().Set("Content-Security-Policy", strings.Join(csp, "; "))
+}