update-disallowed-input.js

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function runTest(config)

    // This test passes |response| to update() as a JSON Web Key Set.

    // CDMs other than Clear Key won't expect |response| in this format.

    promise_test(function(test) {

        var initDataType;

        var initData;

        var keySystem = config.keysystem;

        var mediaKeySession;

        function createReallyLongJWKSet()

            // This is just a standard JWKSet with a lot of

            // extra items added to the end. Key ID and key

            // doesn't really matter.

            var jwkSet = '{"keys":[{'

                       +     '"kty":"oct",'

                       +     '"k":"MDEyMzQ1Njc4OTAxMjM0NQ",'

                       +     '"kid":"MDEyMzQ1Njc4OTAxMjM0NQ"'

                       + '}]';

            return jwkSet + ',"test":"unknown"'.repeat(4000) + '}';

        var p = navigator.requestMediaKeySystemAccess(keySystem, getSimpleConfiguration()).then(function(access) {

            initDataType = access.getConfiguration().initDataTypes[0];

            initData = getInitData(initDataType);

            return access.createMediaKeys();

        }).then(function(mediaKeys) {

            mediaKeySession = mediaKeys.createSession();

            var eventWatcher = new EventWatcher(test, mediaKeySession, ['message']);

            var promise = eventWatcher.wait_for('message');

            mediaKeySession.generateRequest(initDataType, initData);

            return promise;

        }).then(function () {

            var jwkSet = createReallyLongJWKSet();

            assert_greater_than(jwkSet.length, 65536);

            var jwkSetArray = stringToUint8Array(jwkSet);

            return mediaKeySession.update(jwkSetArray);

});

        return promise_rejects_js(test, TypeError, p);

    }, 'update() with invalid response (longer than 64Kb characters) should fail.');