Mercurial > addons > firefox-addons > feed-preview

annotate js/background.js @ 11:a4590add4901

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Add preset with common web-based feed readers
author Guido Berhoerster <guido+feed-preview@berhoerster.name>
date Sat, 08 Dec 2018 12:01:32 +0100
parents ff5e5e3eba32
children 376a0e415bba
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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
11
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14 const FEED_READERS_PRESET = [
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15 {
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16 title: 'Feedly',
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17 urlTemplate: 'https://feedly.com/#subscription/feed/%s'
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18 },
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19 {
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20 title: 'FlowReader',
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21 urlTemplate: 'https://www.flowreader.com/subscribe?url=%s'
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22 },
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23 {
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24 title: 'InoReader',
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25 urlTemplate: 'https://www.inoreader.com/feed/%s'
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26 },
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27 {
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28 title: 'Kouio',
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29 urlTemplate: 'https://kouio.com/subscribe?url=%s'
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30 },
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31 {
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32 title: 'My Yahoo',
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33 urlTemplate: 'https://add.my.yahoo.com/rss?url=%s'
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34 },
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35 {
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36 title: 'Netvibes',
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37 urlTemplate: 'https://www.netvibes.com/subscribe.php?url=%s'
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38 },
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39 {
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40 title: 'NewsBlur',
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41 urlTemplate: 'https://www.newsblur.com/?url=%s'
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42 },
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43 {
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44 title: 'The Old Reader',
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45 urlTemplate: 'https://theoldreader.com/feeds/subscribe?url=%s'
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46 }
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47 ];
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48 const FEED_MAGIC = [
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49 '<rss',
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50 '<feed',
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51 ...Object.values(feedParser.XMLNS)
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52 ];
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53 var tabsFeeds = new Map();
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54 var tabsFeedPreviews = new Map();
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55 var fetchingFeedPreview = fetch('web_resources/feed-preview.xhtml')
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56 .then(response => response.text());
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57
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58 function parseContentType(header) {
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59 let contentType = {
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60 mediaType: '',
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61 charset: 'utf-8'
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62 };
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63 let parts = header.toLowerCase().split(';');
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64 contentType.mediaType = parts.shift().trim();
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65 for (let parameter of parts) {
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66 let [, name, value, ] = parameter.trim().split(/([^=]+)="?([^"]*)"?/);
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67 if (name.toLowerCase() === 'charset') {
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68 contentType.charset = value.toLowerCase();
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69 break;
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70 }
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71 }
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72
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73 return contentType;
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74 }
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75
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76 async function handleFeed(inputText, tabId, url) {
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77 // fast-path: eliminate XML documents which cannot be Atom nor RSS feeds
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78 let inputTextStart = inputText.substring(0, 512);
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79 if (!FEED_MAGIC.some(element => inputTextStart.includes(element))) {
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80 return inputText;
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81 }
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82
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83 let feed;
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84 try {
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85 feed = (new feedParser.FeedParser).parseFromString(inputText, url);
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86 } catch (e) {
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87 if (e instanceof feedParser.ParserError ||
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88 e instanceof feedParser.UnsupportedFeedTypeError) {
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89 // let the browser deal with non-well formed XML or XML documents
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90 // which are not supported Atom or RSS feeds
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91 return inputText;
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92 }
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93 throw e;
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94 }
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95 console.log(`parsed feed ${url}:\n`, feed);
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96
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97 // mark this feed preview for content script injection
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98 tabsFeedPreviews.set(tabId, url);
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99
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100 // render the preview document
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101 let feedPreviewDocument = new DOMParser()
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102 .parseFromString(await fetchingFeedPreview, 'text/html');
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103 renderFeedPreview(feedPreviewDocument, feed);
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104
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105 return new XMLSerializer().serializeToString(feedPreviewDocument);
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106 }
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107
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108 browser.webRequest.onHeadersReceived.addListener(details => {
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109 if (details.statusCode !== 200) {
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110 return {};
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111 }
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112
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113 let contentTypeIndex = details.responseHeaders.findIndex(header =>
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114 header.name.toLowerCase() === 'content-type' &&
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115 typeof header.value !== 'undefined');
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116 if (contentTypeIndex < 0) {
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117 // no Content-Type header found
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118 return {};
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119 }
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120 let headerValue = details.responseHeaders[contentTypeIndex].value
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121 let contentType = parseContentType(headerValue);
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122 // until content handlers become available to webextensions
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123 // (https://bugzilla.mozilla.org/show_bug.cgi?id=1457500) intercept all
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124 // responses and change the content type from application/atom+xml or
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125 // application/rss+xml to application/xml which will then be probed for
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126 // Atom or RSS content
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127 switch (contentType.mediaType) {
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128 case 'application/atom+xml':
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129 case 'application/rss+xml':
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130 case 'application/rdf+xml':
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131 case 'application/xml':
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132 break;
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133 default:
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134 // non-XML media type
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135 return {};
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136 }
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137 console.log(`response is an XML document\n`,
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138 `media type: ${contentType.mediaType}\n`,
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139 `charset: ${contentType.charset}`);
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140
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141 let decoder;
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142 try {
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143 decoder = new TextDecoder(contentType.charset);
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144 } catch (e) {
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145 if (e instanceof RangeError) {
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146 // unsupported charset
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147 return {};
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148 } else {
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149 throw e;
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150 }
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151 }
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152 let encoder = new TextEncoder();
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153 let inputText = '';
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154 let filter = browser.webRequest.filterResponseData(details.requestId);
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155 filter.addEventListener('data', ev => {
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156 inputText += decoder.decode(ev.data, {stream: true});
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157 });
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158 filter.addEventListener('stop', async ev => {
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159 let result = await handleFeed(inputText, details.tabId, details.url);
6
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160 filter.write(encoder.encode(result));
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161 filter.close();
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162 });
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163
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164 details.responseHeaders[contentTypeIndex] = {
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165 name: 'Content-Type',
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166 value: `application/xml;charset=${contentType.charset}`
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167 };
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168
0
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169 return {responseHeaders: details.responseHeaders};
6
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170 },
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171 {urls: ['http://*/*', 'https://*/*'], types: ['main_frame']},
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172 ['blocking', 'responseHeaders']);
0
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173
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174 browser.runtime.onMessage.addListener((request, sender, sendResponse) => {
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175 let tab = sender.tab;
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176 if (typeof tab !== 'undefined') {
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177 // content script sending feeds
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178 tabsFeeds.set(tab.id, request);
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179 browser.pageAction.show(tab.id);
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180 } else {
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181 // popup querying feeds
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182 sendResponse(tabsFeeds.get(request));
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183 }
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184 });
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185
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186 browser.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
0
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187 if (typeof changeInfo.url === 'undefined') {
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188 // filter out updates which do not change the URL
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189 return;
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190 }
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191
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192 // hide the page action when the URL changes since it is no longer valid,
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193 // it will be shown again if the content script detects a feed
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194 browser.pageAction.hide(tabId);
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195
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196 // inject content script once if the requested URL is a feed preview
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197 if (tabsFeedPreviews.get(tabId) === changeInfo.url) {
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198 browser.tabs.executeScript(tabId, {
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199 file: 'content_scripts/feed-readers.js'
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200 });
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201 tabsFeedPreviews.delete(tabId);
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202 }
0
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203 });
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204
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205 browser.tabs.onRemoved.addListener((tabId, removeInfo) => {
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206 tabsFeeds.delete(tabId);
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207 tabsFeedPreviews.delete(tabId);
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208 });
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209
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210 browser.runtime.onInstalled.addListener(async details => {
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211 if (details.reason === 'install' ||
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212 (details.reason === 'update' && details.previousVersion < 2)) {
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213 let {feedReaders = []} = await browser.storage.sync.get('feedReaders');
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214 let feedReadersSet =
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215 new Set(feedReaders.map(feedReader => feedReader.urlTemplate));
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216 for (let feedReader of FEED_READERS_PRESET) {
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217 if (!feedReadersSet.has(feedReader.urlTemplate)) {
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218 feedReaders.push(feedReader);
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219 }
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220 }
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221 console.log('set feedReaders to', feedReaders);
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222 browser.storage.sync.set({feedReaders});
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223 }
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224 });