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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import './pdf_viewer_wrapper.js';
import {BrowserApi, createBrowserApi} from './browser_api.js';
import {PdfViewerBaseElement} from './pdf_viewer_wrapper.js';
/**
* Stores any pending messages received which should be passed to the
* PDFViewer when it is created.
*/
const pendingMessages: MessageEvent[] = [];
/**
* Handles events that are received prior to the PDFViewer being created.
*/
function handleScriptingMessage(message: MessageEvent) {
pendingMessages.push(message);
}
/**
* Initialize the global PDFViewer and pass any outstanding messages to it.
*/
function initViewer(browserApi: BrowserApi) {
// PDFViewer will handle any messages after it is created.
window.removeEventListener('message', handleScriptingMessage, false);
const viewer = document.querySelector<PdfViewerBaseElement>('#viewer')!;
viewer.init(browserApi);
while (pendingMessages.length > 0) {
viewer.handleScriptingMessage(pendingMessages.shift()!);
}
Object.assign(window, {viewer});
}
/**
* Determine if the content settings allow PDFs to execute javascript.
*/
function configureJavaScriptContentSetting(browserApi: BrowserApi):
Promise<BrowserApi> {
return new Promise(resolve => {
chrome.contentSettings.javascript.get(
{
'primaryUrl': browserApi.getStreamInfo().originalUrl,
'secondaryUrl': window.location.origin,
},
(result) => {
browserApi.getStreamInfo().javascript = result.setting;
resolve(browserApi);
});
});
}
/**
* Entrypoint for starting the PDF viewer. This function obtains the browser
* API for the PDF and initializes the PDF Viewer.
*/
function main() {
// Set up an event listener to catch scripting messages which are sent prior
// to the PDFViewer being created.
window.addEventListener('message', handleScriptingMessage, false);
let chain = createBrowserApi();
// Content settings may not be present in test environments.
if (chrome.contentSettings) {
chain = chain.then(configureJavaScriptContentSetting);
}
chain.then(initViewer);
}
main();
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