initial commit. phase 1 complete

frontend/node_modules/openid-client/lib/helpers/assert.js

@@ -0,0 +1,24 @@
+function assertSigningAlgValuesSupport(endpoint, issuer, properties) {
+  if (!issuer[`${endpoint}_endpoint`]) return;
+
+  const eam = `${endpoint}_endpoint_auth_method`;
+  const easa = `${endpoint}_endpoint_auth_signing_alg`;
+  const easavs = `${endpoint}_endpoint_auth_signing_alg_values_supported`;
+
+  if (properties[eam] && properties[eam].endsWith('_jwt') && !properties[easa] && !issuer[easavs]) {
+    throw new TypeError(
+      `${easavs} must be configured on the issuer if ${easa} is not defined on a client`,
+    );
+  }
+}
+
+function assertIssuerConfiguration(issuer, endpoint) {
+  if (!issuer[endpoint]) {
+    throw new TypeError(`${endpoint} must be configured on the issuer`);
+  }
+}
+
+module.exports = {
+  assertSigningAlgValuesSupport,
+  assertIssuerConfiguration,
+};