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document-info.js
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document-info.js
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/**
* Copyright 2015 The AMP HTML Authors. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {getServiceForDoc} from './service';
import {parseUrl, getSourceUrl} from './url';
import {user} from './log';
/**
* Properties:
* - url: The doc's url.
* - sourceUrl: the source url of an amp document.
* - canonicalUrl: The doc's canonical.
* - pageViewId: Id for this page view. Low entropy but should be unique
* for concurrent page views of a user().
*
* @typedef {{
* url: string,
* sourceUrl: string,
* canonicalUrl: string,
* pageViewId: string,
* }}
*/
export let DocumentInfoDef;
/**
* @param {!Node|!./service/ampdoc-impl.AmpDoc} nodeOrDoc
* @return {!DocumentInfoDef} Info about the doc
*/
export function documentInfoForDoc(nodeOrDoc) {
return /** @type {!DocumentInfoDef} */ (getServiceForDoc(nodeOrDoc,
'documentInfo', ampdoc => {
const rootNode = ampdoc.getRootNode();
let canonicalUrl = rootNode && rootNode.AMP
&& rootNode.AMP.canonicalUrl;
if (!canonicalUrl) {
const canonicalTag = user().assert(
rootNode.querySelector('link[rel=canonical]'),
'AMP files are required to have a <link rel=canonical> tag.');
canonicalUrl = parseUrl(canonicalTag.href).href;
}
const pageViewId = getPageViewId(ampdoc.win);
const res = {
get sourceUrl() {
return getSourceUrl(ampdoc.getUrl());
},
canonicalUrl,
pageViewId,
};
return res;
}));
}
/**
* Returns a relatively low entropy random string.
* This should be called once per window and then cached for subsequent
* access to the same value to be persistent per page.
* @param {!Window} win
* @return {string}
*/
function getPageViewId(win) {
return String(Math.floor(win.Math.random() * 10000));
}