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third_party/polymer/components/iron-ajax/iron-ajax.html

Index: third_party/polymer/components/iron-ajax/iron-ajax.html
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+<!--
+@license
+Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+
+<link rel="import" href="../polymer/polymer.html">
+<link rel="import" href="iron-request.html">
+
+<!--
+The `iron-ajax` element exposes network request functionality.
+
+    <iron-ajax
+        auto
+        url="https://www.googleapis.com/youtube/v3/search"
+        params='{"part":"snippet", "q":"polymer", "key": "YOUTUBE_API_KEY", "type": "video"}'
+        handle-as="json"
+        on-response="handleResponse"
+        debounce-duration="300"></iron-ajax>
+
+With `auto` set to `true`, the element performs a request whenever
+its `url`, `params` or `body` properties are changed. Automatically generated
+requests will be debounced in the case that multiple attributes are changed
+sequentially.
+
+Note: The `params` attribute must be double quoted JSON.
+
+You can trigger a request explicitly by calling `generateRequest` on the
+element.
+
+@demo demo/index.html
+@hero hero.svg
+-->
+
+<script>
+  'use strict';
+
+  Polymer({
+
+    is: 'iron-ajax',
+
+    /**
+     * Fired when a request is sent.
+     *
+     * @event request
+     * @event iron-ajax-request
+     */
+
+    /**
+     * Fired when a response is received.
+     *
+     * @event response
+     * @event iron-ajax-response
+     */
+
+    /**
+     * Fired when an error is received.
+     *
+     * @event error
+     * @event iron-ajax-error
+     */
+
+    hostAttributes: {
+      hidden: true
+    },
+
+    properties: {
+      /**
+       * The URL target of the request.
+       */
+      url: {
+        type: String
+      },
+
+      /**
+       * An object that contains query parameters to be appended to the
+       * specified `url` when generating a request. If you wish to set the body
+       * content when making a POST request, you should use the `body` property
+       * instead.
+       */
+      params: {
+        type: Object,
+        value: function() {
+          return {};
+        }
+      },
+
+      /**
+       * The HTTP method to use such as 'GET', 'POST', 'PUT', or 'DELETE'.
+       * Default is 'GET'.
+       */
+      method: {
+        type: String,
+        value: 'GET'
+      },
+
+      /**
+       * HTTP request headers to send.
+       *
+       * Example:
+       *
+       *     <iron-ajax
+       *         auto
+       *         url="http://somesite.com"
+       *         headers='{"X-Requested-With": "XMLHttpRequest"}'
+       *         handle-as="json"></iron-ajax>
+       *
+       * Note: setting a `Content-Type` header here will override the value
+       * specified by the `contentType` property of this element.
+       */
+      headers: {
+        type: Object,
+        value: function() {
+          return {};
+        }
+      },
+
+      /**
+       * Content type to use when sending data. If the `contentType` property
+       * is set and a `Content-Type` header is specified in the `headers`
+       * property, the `headers` property value will take precedence.
+       *
+       * Varies the handling of the `body` param.
+       */
+      contentType: {
+        type: String,
+        value: null
+      },
+
+      /**
+       * Body content to send with the request, typically used with "POST"
+       * requests.
+       *
+       * If body is a string it will be sent unmodified.
+       *
+       * If Content-Type is set to a value listed below, then
+       * the body will be encoded accordingly.
+       *
+       *    * `content-type="application/json"`
+       *      * body is encoded like `{"foo":"bar baz","x":1}`
+       *    * `content-type="application/x-www-form-urlencoded"`
+       *      * body is encoded like `foo=bar+baz&x=1`
+       *
+       * Otherwise the body will be passed to the browser unmodified, and it
+       * will handle any encoding (e.g. for FormData, Blob, ArrayBuffer).
+       *
+       * @type (ArrayBuffer|ArrayBufferView|Blob|Document|FormData|null|string|undefined|Object)
+       */
+      body: {
+        type: Object,
+        value: null
+      },
+
+      /**
+       * Toggle whether XHR is synchronous or asynchronous. Don't change this
+       * to true unless You Know What You Are Doing™.
+       */
+      sync: {
+        type: Boolean,
+        value: false
+      },
+
+      /**
+       * Specifies what data to store in the `response` property, and
+       * to deliver as `event.detail.response` in `response` events.
+       *
+       * One of:
+       *
+       *    `text`: uses `XHR.responseText`.
+       *
+       *    `xml`: uses `XHR.responseXML`.
+       *
+       *    `json`: uses `XHR.responseText` parsed as JSON.
+       *
+       *    `arraybuffer`: uses `XHR.response`.
+       *
+       *    `blob`: uses `XHR.response`.
+       *
+       *    `document`: uses `XHR.response`.
+       */
+      handleAs: {
+        type: String,
+        value: 'json'
+      },
+
+      /**
+       * Set the withCredentials flag on the request.
+       */
+      withCredentials: {
+        type: Boolean,
+        value: false
+      },
+
+      /**
+       * Set the timeout flag on the request.
+       */
+      timeout: {
+        type: Number,
+        value: 0
+      },
+
+      /**
+       * If true, automatically performs an Ajax request when either `url` or
+       * `params` changes.
+       */
+      auto: {
+        type: Boolean,
+        value: false
+      },
+
+      /**
+       * If true, error messages will automatically be logged to the console.
+       */
+      verbose: {
+        type: Boolean,
+        value: false
+      },
+
+      /**
+       * The most recent request made by this iron-ajax element.
+       */
+      lastRequest: {
+        type: Object,
+        notify: true,
+        readOnly: true
+      },
+
+      /**
+       * True while lastRequest is in flight.
+       */
+      loading: {
+        type: Boolean,
+        notify: true,
+        readOnly: true
+      },
+
+      /**
+       * lastRequest's response.
+       *
+       * Note that lastResponse and lastError are set when lastRequest finishes,
+       * so if loading is true, then lastResponse and lastError will correspond
+       * to the result of the previous request.
+       *
+       * The type of the response is determined by the value of `handleAs` at
+       * the time that the request was generated.
+       *
+       * @type {Object}
+       */
+      lastResponse: {
+        type: Object,
+        notify: true,
+        readOnly: true
+      },
+
+      /**
+       * lastRequest's error, if any.
+       *
+       * @type {Object}
+       */
+      lastError: {
+        type: Object,
+        notify: true,
+        readOnly: true
+      },
+
+      /**
+       * An Array of all in-flight requests originating from this iron-ajax
+       * element.
+       */
+      activeRequests: {
+        type: Array,
+        notify: true,
+        readOnly: true,
+        value: function() {
+          return [];
+        }
+      },
+
+      /**
+       * Length of time in milliseconds to debounce multiple automatically generated requests.
+       */
+      debounceDuration: {
+        type: Number,
+        value: 0,
+        notify: true
+      },
+
+      /**
+       * Prefix to be stripped from a JSON response before parsing it.
+       *
+       * In order to prevent an attack using CSRF with Array responses
+       * (http://haacked.com/archive/2008/11/20/anatomy-of-a-subtle-json-vulnerability.aspx/)
+       * many backends will mitigate this by prefixing all JSON response bodies
+       * with a string that would be nonsensical to a JavaScript parser.
+       *
+       */
+      jsonPrefix: {
+        type: String,
+        value: ''
+      },
+
+      /**
+       * By default, iron-ajax's events do not bubble. Setting this attribute will cause its
+       * request and response events as well as its iron-ajax-request, -response,  and -error
+       * events to bubble to the window object. The vanilla error event never bubbles when
+       * using shadow dom even if this.bubbles is true because a scoped flag is not passed with
+       * it (first link) and because the shadow dom spec did not used to allow certain events,
+       * including events named error, to leak outside of shadow trees (second link).
+       * https://www.w3.org/TR/shadow-dom/#scoped-flag
+       * https://www.w3.org/TR/2015/WD-shadow-dom-20151215/#events-that-are-not-leaked-into-ancestor-trees
+       */
+      bubbles: {
+        type: Boolean,
+        value: false
+      },
+
+      _boundHandleResponse: {
+        type: Function,
+        value: function() {
+          return this._handleResponse.bind(this);
+        }
+      }
+    },
+
+    observers: [
+      '_requestOptionsChanged(url, method, params.*, headers, contentType, ' +
+          'body, sync, handleAs, jsonPrefix, withCredentials, timeout, auto)'
+    ],
+
+    /**
+     * The query string that should be appended to the `url`, serialized from
+     * the current value of `params`.
+     *
+     * @return {string}
+     */
+    get queryString () {
+      var queryParts = [];
+      var param;
+      var value;
+
+      for (param in this.params) {
+        value = this.params[param];
+        param = window.encodeURIComponent(param);
+
+        if (Array.isArray(value)) {
+          for (var i = 0; i < value.length; i++) {
+            queryParts.push(param + '=' + window.encodeURIComponent(value[i]));
+          }
+        } else if (value !== null) {
+          queryParts.push(param + '=' + window.encodeURIComponent(value));
+        } else {
+          queryParts.push(param);
+        }
+      }
+
+      return queryParts.join('&');
+    },
+
+    /**
+     * The `url` with query string (if `params` are specified), suitable for
+     * providing to an `iron-request` instance.
+     *
+     * @return {string}
+     */
+    get requestUrl() {
+      var queryString = this.queryString;
+      var url = this.url || '';
+
+      if (queryString) {
+        var bindingChar = url.indexOf('?') >= 0 ? '&' : '?';
+        return url + bindingChar + queryString;
+      }
+
+      return url;
+    },
+
+    /**
+     * An object that maps header names to header values, first applying the
+     * the value of `Content-Type` and then overlaying the headers specified
+     * in the `headers` property.
+     *
+     * @return {Object}
+     */
+    get requestHeaders() {
+      var headers = {};
+      var contentType = this.contentType;
+      if (contentType == null && (typeof this.body === 'string')) {
+        contentType = 'application/x-www-form-urlencoded';
+      }
+      if (contentType) {
+        headers['content-type'] = contentType;
+      }
+      var header;
+
+      if (this.headers instanceof Object) {
+        for (header in this.headers) {
+          headers[header] = this.headers[header].toString();
+        }
+      }
+
+      return headers;
+    },
+
+    /**
+     * Request options suitable for generating an `iron-request` instance based
+     * on the current state of the `iron-ajax` instance's properties.
+     *
+     * @return {{
+     *   url: string,
+     *   method: (string|undefined),
+     *   async: (boolean|undefined),
+     *   body: (ArrayBuffer|ArrayBufferView|Blob|Document|FormData|null|string|undefined|Object),
+     *   headers: (Object|undefined),
+     *   handleAs: (string|undefined),
+     *   jsonPrefix: (string|undefined),
+     *   withCredentials: (boolean|undefined)}}
+     */
+    toRequestOptions: function() {
+      return {
+        url: this.requestUrl || '',
+        method: this.method,
+        headers: this.requestHeaders,
+        body: this.body,
+        async: !this.sync,
+        handleAs: this.handleAs,
+        jsonPrefix: this.jsonPrefix,
+        withCredentials: this.withCredentials,
+        timeout: this.timeout
+      };
+    },
+
+    /**
+     * Performs an AJAX request to the specified URL.
+     *
+     * @return {!IronRequestElement}
+     */
+    generateRequest: function() {
+      var request = /** @type {!IronRequestElement} */ (document.createElement('iron-request'));
+      var requestOptions = this.toRequestOptions();
+
+      this.push('activeRequests', request);
+
+      request.completes.then(
+        this._boundHandleResponse
+      ).catch(
+        this._handleError.bind(this, request)
+      ).then(
+        this._discardRequest.bind(this, request)
+      );
+
+      request.send(requestOptions);
+
+      this._setLastRequest(request);
+      this._setLoading(true);
+
+      this.fire('request', {
+        request: request,
+        options: requestOptions
+      }, {bubbles: this.bubbles});
+
+      this.fire('iron-ajax-request', {
+        request: request,
+        options: requestOptions
+      }, {bubbles: this.bubbles});
+
+      return request;
+    },
+
+    _handleResponse: function(request) {
+      if (request === this.lastRequest) {
+        this._setLastResponse(request.response);
+        this._setLastError(null);
+        this._setLoading(false);
+      }
+      this.fire('response', request, {bubbles: this.bubbles});
+      this.fire('iron-ajax-response', request, {bubbles: this.bubbles});
+    },
+
+    _handleError: function(request, error) {
+      if (this.verbose) {
+        Polymer.Base._error(error);
+      }
+
+      if (request === this.lastRequest) {
+        this._setLastError({
+          request: request,
+          error: error,
+          status: request.xhr.status,
+          statusText: request.xhr.statusText,
+          response: request.xhr.response
+        });
+        this._setLastResponse(null);
+        this._setLoading(false);
+      }
+
+      // Tests fail if this goes after the normal this.fire('error', ...)
+      this.fire('iron-ajax-error', {
+        request: request,
+        error: error
+      }, {bubbles: this.bubbles});
+
+      this.fire('error', {
+        request: request,
+        error: error
+      }, {bubbles: this.bubbles});
+    },
+
+    _discardRequest: function(request) {
+      var requestIndex = this.activeRequests.indexOf(request);
+
+      if (requestIndex > -1) {
+        this.splice('activeRequests', requestIndex, 1);
+      }
+    },
+
+    _requestOptionsChanged: function() {
+      this.debounce('generate-request', function() {
+        if (this.url == null) {
+          return;
+        }
+
+        if (this.auto) {
+          this.generateRequest();
+        }
+      }, this.debounceDuration);
+    },
+
+  });
+</script>