initial commit

auth/authorizer.go

@@ -0,0 +1,31 @@
+package auth
+
+import (
+	"net/http"
+
+	"github.com/go-chi/render"
+)
+
+// RequiresRole middleware restricts access to accounts having role parameter in their jwt claims.
+func RequiresRole(role string) func(next http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		hfn := func(w http.ResponseWriter, r *http.Request) {
+			claims := ClaimsFromCtx(r.Context())
+			if !hasRole(role, claims.Roles) {
+				render.Render(w, r, ErrForbidden)
+				return
+			}
+			next.ServeHTTP(w, r)
+		}
+		return http.HandlerFunc(hfn)
+	}
+}
+
+func hasRole(role string, roles []string) bool {
+	for _, r := range roles {
+		if r == role {
+			return true
+		}
+	}
+	return false
+}