swagger2-client.js

(function() {
  /*
    var swagger = new SwaggerClient({swagger: "2.0", info: {}, paths: {}});
    swagger.listPets({limit: 10}, function(err, xhr) {
      console.log(xhr.code, xhr.body);
    });
  */

  window.SwaggerClient = function(spec) {
    var self = this;
    this.baseUrl = (spec.baseUrl || '').replace(/\//, '');

    // Generate methods from spec
    Object.keys(spec.paths).forEach(function(path) {
      Object.keys(spec.paths[path]).forEach(function(httpMethod) {
        var opSpec = spec.paths[path][httpMethod];
        var pathList = path.split('/');
        self[opSpec.operationId] = function(args, cb) {
          var req, xhr = new XMLHttpRequest();
          xhr.url = pathList;
          req = this.makeRequest(args, opSpec.parameters || [], xhr);
          xhr.open(httpMethod, req.url);
          xhr.onreadystatechange = function() {
            if (xhr.readyState != 4) return;
            xhr.body = xhr.responseText.match(/^[\{\[]/) ? JSON.parse(xhr.responseText) : xhr.responseText;
            cb.call(this, xhr.status == 200 ? null : {}, xhr);
          }.bind(this);
          xhr.send(req.body);
        };
      }
    });
  };

  var proto = window.SwaggerClient.prototype;

  proto.makeRequest = function(args, parameters, xhr) {
    var form = [], json = {}, query = [], str;
    var req = {body: null};
    var url = [this.baseUrl];

    xhr.url.forEach(function(p) {
      url.push(p.replace(/\{(\w+)\}/, function(m, n) { return args[n]; }));
    });

    for (i = 0; i < parameters.length; i++) {
      var p = parameters[i];
      var name = p.name;
      var value = args[name];

      if (typeof value == 'undefined') value = p['default'];
      if (typeof value == 'undefined') continue;

      switch (p['in']) {
        case 'query':
          query.push([name, value]);
          break;
        case 'file':
          req.body = value;
          break;
        case 'body':
          json[name] = value;
          break;
        case 'header':
          xhr.setRequestHeader(name, value);
          break;
        case 'formData':
          form.push([name, value]);
          break;
      }
    }

    if (Object.keys(req.json).length) {
      xhr.setRequestHeader('Content-Type', 'application/json');
      req.body = JSON.stringify(req.json);
    }
    else if(form.length) {
      str = [];
      xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
      form.forEach(function(i) { str.push(encodeURIComponent(i[0]) + '=' + encodeURIComponent(i[1])); });
      req.body = str.join('&');
    }

    if (query.length) {
      str = [];
      query.forEach(function(i) { str.push(encodeURIComponent(i[0]) + '=' + encodeURIComponent(i[1])); });
      req.url += '?' + str.join('&');
    }

    xhr.url = url.join('/');
    return req;
  };
})(window);