1 files changed, 23 insertions, 0 deletions
diff --git a/src/lib/CSP.js b/src/lib/CSP.js
new file mode 100644
index 0000000..79590bc
--- /dev/null
+++ b/src/lib/CSP.js
@@ -0,0 +1,23 @@
+"use strict";
+
+class CSP {
+    
+  build(...directives) {
+    return directives.join(';');
+  }
+  
+  buildBlocker(...types) {
+      return this.build(...(types.map(type => `${type.name || type}-src ${type.value || "'none'"}`)));
+  }
+  
+  blocks(header, type) {
+    return `;${header};`.includes(`;${type}-src 'none';`)
+  }
+  
+  asHeader(value) {
+    return {name: CSP.headerName, value};
+  }
+}
+
+CSP.isEmbedType = type => /\b(?:application|video|audio)\b/.test(type);
+CSP.headerName = "content-security-policy";