Mercurial > addons > firefox-addons > feed-preview

annotate js/background.js @ 7:2bbb7617dd13

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author Guido Berhoerster <guido+feed-preview@berhoerster.name>
date Tue, 27 Nov 2018 10:47:26 +0100
parents 5d7c13e998e9
children ff5e5e3eba32
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1 /*
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2 * Copyright (C) 2018 Guido Berhoerster <guido+feed-preview@berhoerster.name>
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3 *
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4 * This Source Code Form is subject to the terms of the Mozilla Public
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5 * License, v. 2.0. If a copy of the MPL was not distributed with this
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6 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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7 */
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8
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9 'use strict';
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10
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11 import * as feedParser from './feed-parser.js';
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12 import {renderFeedPreview} from './feed-preview.js';
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13
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14 const FEED_MAGIC = [
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15 '<rss',
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16 '<feed',
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17 ...Object.values(feedParser.XMLNS)
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18 ];
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19 var tabsFeeds = new Map();
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20 var fetchingFeedPreview = fetch('web_resources/feed-preview.xhtml')
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21 .then(response => response.text());
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22
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23 function parseContentType(header) {
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24 let contentType = {
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25 mediaType: '',
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26 charset: 'utf-8'
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27 };
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28 let parts = header.toLowerCase().split(';');
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29 contentType.mediaType = parts.shift().trim();
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30 for (let parameter of parts) {
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31 let [, name, value, ] = parameter.trim().split(/([^=]+)="?([^"]*)"?/);
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32 if (name.toLowerCase() === 'charset') {
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33 contentType.charset = value.toLowerCase();
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34 break;
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35 }
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36 }
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37
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38 return contentType;
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39 }
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40
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41 async function handleFeed(inputText, url) {
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42 // fast-path: eliminate XML documents which cannot be Atom nor RSS feeds
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43 let inputTextStart = inputText.substring(0, 512);
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44 if (!FEED_MAGIC.some(element => inputTextStart.includes(element))) {
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45 return inputText;
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46 }
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47
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48 let feed;
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49 try {
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50 feed = (new feedParser.FeedParser).parseFromString(inputText, url);
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51 } catch (e) {
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52 if (e instanceof feedParser.ParserError ||
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53 e instanceof feedParser.UnsupportedFeedTypeError) {
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54 // let the browser deal with non-well formed XML or XML documents
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55 // which are not supported Atom or RSS feeds
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56 return inputText;
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57 }
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58 throw e;
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59 }
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60 console.log(`parsed feed ${url}:\n`, feed);
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61
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62 // render the preview document
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63 let feedPreviewDocument = new DOMParser()
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64 .parseFromString(await fetchingFeedPreview, 'text/html');
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65 renderFeedPreview(feedPreviewDocument, feed);
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66
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67 return new XMLSerializer().serializeToString(feedPreviewDocument);
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68 }
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69
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70 browser.webRequest.onHeadersReceived.addListener(details => {
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71 if (details.statusCode !== 200) {
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72 return {};
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73 }
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74
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75 let contentTypeIndex = details.responseHeaders.findIndex(header =>
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76 header.name.toLowerCase() === 'content-type' &&
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77 typeof header.value !== 'undefined');
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78 if (contentTypeIndex < 0) {
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79 // no Content-Type header found
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80 return {};
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81 }
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82 let headerValue = details.responseHeaders[contentTypeIndex].value
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83 let contentType = parseContentType(headerValue);
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84 // until content handlers become available to webextensions
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85 // (https://bugzilla.mozilla.org/show_bug.cgi?id=1457500) intercept all
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86 // responses and change the content type from application/atom+xml or
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87 // application/rss+xml to application/xml which will then be probed for
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88 // Atom or RSS content
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89 switch (contentType.mediaType) {
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90 case 'application/atom+xml':
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91 case 'application/rss+xml':
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92 case 'application/rdf+xml':
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93 case 'application/xml':
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94 break;
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95 default:
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96 // non-XML media type
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97 return {};
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98 }
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99 console.log(`response is an XML document\n`,
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100 `media type: ${contentType.mediaType}\n`,
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101 `charset: ${contentType.charset}`);
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102
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103 let decoder;
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104 try {
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105 decoder = new TextDecoder(contentType.charset);
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106 } catch (e) {
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107 if (e instanceof RangeError) {
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108 // unsupported charset
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109 return {};
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110 } else {
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111 throw e;
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112 }
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113 }
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114 let encoder = new TextEncoder();
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115 let inputText = '';
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116 let filter = browser.webRequest.filterResponseData(details.requestId);
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117 filter.addEventListener('data', ev => {
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118 inputText += decoder.decode(ev.data, {stream: true});
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119 });
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120 filter.addEventListener('stop', async ev => {
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121 let result = await handleFeed(inputText, details.url);
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122 filter.write(encoder.encode(result));
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123 filter.close();
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124 });
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125
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126 details.responseHeaders[contentTypeIndex] = {
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127 name: 'Content-Type',
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128 value: `application/xml;charset=${contentType.charset}`
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129 };
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130
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131 return {responseHeaders: details.responseHeaders};
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132 },
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133 {urls: ['http://*/*', 'https://*/*'], types: ['main_frame']},
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134 ['blocking', 'responseHeaders']);
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135
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136 browser.runtime.onMessage.addListener((request, sender, sendResponse) => {
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137 let tab = sender.tab;
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138 if (typeof tab !== 'undefined') {
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139 // content script sending feeds
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140 tabsFeeds.set(tab.id, request);
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141 browser.pageAction.show(tab.id);
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142 } else {
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143 // popup querying feeds
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144 sendResponse(tabsFeeds.get(request));
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145 }
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146 });
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147
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148 browser.tabs.onUpdated.addListener((id, changeInfo, tab) => {
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149 if (typeof changeInfo.url === 'undefined') {
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150 // filter out updates which do not change the URL
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151 return;
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152 }
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153
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154 // hide the page action when the URL changes since it is no longer valid,
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155 // it will be shown again if the content script detects a feed
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156 browser.pageAction.hide(tab.id);
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157 });
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158
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159 browser.tabs.onRemoved.addListener((tabId, removeInfo) => {
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160 tabsFeeds.delete(tabId);
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161 });