this.registerHandlers = function()

in knative-build/runtimes/javascript/platform/knative.js [576:616]
38 lines of code
11 McCabe index (conditional complexity)

    this.registerHandlers = function(app, platform) {
        var httpMethods = process.env.__OW_HTTP_METHODS;
        // default to "[post]" HTTP method if not defined
        if (typeof httpMethods === "undefined") {
            console.error("__OW_HTTP_METHODS is undefined; defaulting to '[post]' ...");
            httpMethods = DEFAULT_METHOD;
        } else {
            if (httpMethods.startsWith('[') && httpMethods.endsWith(']')) {
                httpMethods = httpMethods.substr(1, httpMethods.length);
                httpMethods = httpMethods.substr(0, httpMethods.length -1);
                httpMethods = httpMethods.split(',');
            }
        }
        // default to "[post]" HTTP method if specified methods are not valid
        if (!Array.isArray(httpMethods) || !Array.length) {
            console.error("__OW_HTTP_METHODS is undefined; defaulting to '[post]' ...");
            httpMethods = DEFAULT_METHOD;
        }

        httpMethods.forEach(function (method) {
            switch (method.toUpperCase()) {
                case http_method.get:
                    app.get('/', platform.run);
                    break;
                case http_method.post:
                    app.post('/', platform.run);
                    break;
                case http_method.put:
                    app.put('/', platform.run);
                    break;
                case http_method.delete:
                    app.delete('/', platform.run);
                    break;
                case http_method.options:
                    app.options('/', platform.run);
                    break;
                default:
                    console.error("Environment variable '__OW_HTTP_METHODS' has an unrecognized value (" + method + ").");
            }
        });
    };