Another layer of abstraction for ajax requests to restful api endpoints (unfinished)

AjaxRestfulResource.js

// Copyleft Jon Tyler, 2015+
// MIT license
// requires jQuery
// requires an api endpoint; array of headers is optional
// probably pointless without modification/extension

function Resource(endpoint, options) {
    var settings = {};
    settings.endpoint = endpoint;
    settings.headers = (typeof options == "object") ? options.headers || [] : [];
    settings.getinputs = (typeof options == "object") ? options.getinputs || [] : [];
    settings.defaults = (typeof options == "object") ? options.defaults || {} : {};

    if (typeof settings.headers !== 'object' || !(settings.headers instanceof Array))
        settings.headers = [];
    if (typeof settings.getinputs !== 'object' || !(settings.getinputs instanceof Array))
        settings.getinputs = [];

    // remove excess trailing slashes in the endpoint
    while (settings.endpoint[settings.endpoint.length - 1] == "/") {
        settings.endpoint = settings.endpoint.substr(0, settings.endpoint.length - 1);
    }
    settings.endpoint;

    // general request logic (i.e. headers + any custom stuff)
    function request (options, callback, next) {
        if (typeof options !== 'object') options = {};
        if (typeof options.headers !== 'object') options.headers = {};
        if (typeof options.getinputs !== 'object') options.getinputs = {};
        var headers = {}, hd, gd;
        // parse headers
        hd = typeof settings.defaults.headers == 'object' && JSON.stringify(settings.defaults.headers).length > 2;
        for (var h = 0; h < settings.headers.length; ++h) {
            if (hd)
                headers[settings.headers[h]] = settings.defaults.headers[settings.headers[h]] || '';
            if (options.headers[settings.headers[h]])
                headers[settings.headers[h]] = options.headers[settings.headers[h]];
        }
        next(headers, options, callback);
    }

    function get (url, headers, options, callback) {
        // parse GET url input options
        gd = typeof settings.defaults.getinputs == 'object' && JSON.stringify(settings.defaults.getinputs).length > 2;
        if (options.getinputs.length > 0 || gd) {
            url += "?";
            for (var h = 0, hl = settings.getinputs.length; h < hl; ++h) {
                if (options.getinputs[settings.getinputs[h]])
                    url += settings.getinputs[h] + "=" + escape(options.getinputs[settings.getinputs[h]]) + (h < hl ? "&" : '');
                else if (gd && settings.defaults.getinputs[settings.getinputs[h]])
                    url += settings.getinputs[h] + "=" + escape(settings.defaults.getinputs[settings.getinputs[h]]) + (h < hl ? "&" : '');
            }
        }
        $.ajax({
            datatype: 'text/html',
            url             : url,
            type            : 'GET',
            complete        : function (xhr, statustext) {
                if (statustext == 'success') {
                    callback(xhr.responseJSON);
                } else {
                    callback({"error" : statustext, 'xhr' : xhr});
                }
            },
            headers         : headers
        });
    }

    // get a single item
    this.show = function(options, callback) {
        request(options, callback, function (headers, options) {
            var id = options.id, url = settings.endpoint + (typeof id == 'number' && Number.isInteger(id) ? '/' + id : '');
            get(url, headers, options, callback);
        });
    };

    // list all items
    this.list = function(options, callback) {
        request(options, callback, function (headers, options, callback) {
            var url = settings.endpoint;
            get(url, headers, options, callback);
        });
    };

    // create an item
    this.store = function(options, callback) {
        request(options, callback, function (headers, options) {
            $.ajax({
                'url'       : settings.endpoint,
                'type'      : 'POST',
                'complete'  : function (xhr, statustext) {
                    if (statustext == 'success') {
                        callback(xhr.responseJSON);
                    } else {
                        callback({"error" : statustext, 'xhr' : xhr});
                    }
                },
                'headers'   : headers,
                'data'      : options.data
            });
        });
    };

    // update an item
    this.update = function(options, callback) {
        request(options, callback, function (headers, options) {
            options.id = (typeof options.id == 'number') ? options.id | 0 : 0;
            $.ajax({
                'url'       : settings.endpoint + '/' + options.id,
                'type'      : 'PATCH',
                'complete'  : function (xhr, statustext) {
                    if (statustext == 'success') {
                        callback(xhr.responseJSON);
                    } else {
                        callback({"error" : statustext, 'xhr' : xhr});
                    }
                },
                'headers'   : headers,
                'data'      : options.data
            });
        });
    };

    // delete an item
    this.delete = function(options, callback) {
        request(options, callback, function (headers, options) {
            options.id = (typeof options.id == 'number') ? options.id | 0 : 0;
            $.ajax({
                'url'       : settings.endpoint + '/' + options.id,
                'type'      : 'DELETE',
                'complete'  : function (xhr, statustext) {
                    if (statustext == 'success') {
                        callback(xhr.responseJSON);
                    } else {
                        callback({"error" : statustext, 'xhr' : xhr});
                    }
                },
                'headers'   : headers
            });
        });
    };
}