Mercurial > addons > firefox-addons > feed-preview

annotate content_scripts/feed-preview.js @ 1:1c31f4102408

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Show a hint if the feed has no entries
author Guido Berhoerster <guido+feed-preview@berhoerster.name>
date Thu, 04 Oct 2018 09:40:26 +0200
parents bc5cc170163c
children 086ee559acbb
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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 const ALLOWED_PROTOCOLS = new Set(['http:', 'https:', 'ftp:']);
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12
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13 function encodeXML(str) {
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14 return str.replace(/[<>&'"]/g, c => {
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15 switch (c) {
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16 case '<': return '&lt;';
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17 case '>': return '&gt;';
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18 case '&': return '&amp;';
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19 case '\'': return '&apos;';
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20 case '"': return '&quot;';
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21 }
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22 });
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23 }
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24
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25 function parseDate(s) {
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26 let date = new Date(s);
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27
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28 return isNaN(date) ? new Date(0) : date;
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29 }
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30
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31 function parseURL(text, baseURL = window.location.href) {
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32 let url;
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33
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34 try {
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35 url = new URL(text, baseURL);
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36 } catch (e) {
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37 return null;
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38 }
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39 if (!ALLOWED_PROTOCOLS.has(url.protocol)) {
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40 return null;
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41 }
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42
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43 return url;
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44 }
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45
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46 function normalizeHTML(text) {
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47 let parsedDocument = (new DOMParser()).parseFromString(text, 'text/html');
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48
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49 let linkElement = parsedDocument.createElement('link');
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50 linkElement.rel = 'stylesheet';
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51 linkElement.href ='style/entry-content.css';
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52 parsedDocument.head.appendChild(linkElement);
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53
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54 return (new XMLSerializer()).serializeToString(parsedDocument);
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55 }
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56
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57 function nsMapper(prefix) {
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58 switch (prefix) {
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59 case 'atom':
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60 return 'http://www.w3.org/2005/Atom'
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61 case 'rss':
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62 return 'http://my.netscape.com/rdf/simple/0.9/'
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63 }
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64 return null;
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65 }
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66
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67 function xpathQuery(doc, scopeElement, xpathQuery, nsMapping) {
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68 return doc.evaluate(xpathQuery, scopeElement, nsMapper,
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69 XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
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70 }
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71
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72 function xpathQueryAll(doc, scopeElement, xpathQuery, nsMapping) {
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73 let result = doc.evaluate(xpathQuery, scopeElement, nsMapper,
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74 XPathResult.ORDERED_NODE_ITERATOR_TYPE, null);
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75 let nodes = [];
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76 for (let node = result.iterateNext(); node !== null;
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77 node = result.iterateNext()) {
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78 nodes.push(node);
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79 }
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80
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81 return nodes;
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82 }
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83
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84 class FeedLogo {
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85 constructor(url, title = '') {
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86 this.url = url;
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87 this.title = title;
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88 }
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89 }
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90
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91 class RSS1Logo extends FeedLogo {
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92 constructor(feedDocument, imageElement) {
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93 let urlElement = xpathQuery(feedDocument, imageElement, './rss:url');
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94 if (urlElement === null) {
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95 throw new TypeError('missing <url> element in <logo> element');
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96 }
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97 let url = parseURL(urlElement.textContent.trim());
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98 if (url === null) {
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99 throw new TypeError('invalid URL in <logo> element');
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100 }
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101 super(url);
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102
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103 let titleElement = xpathQuery(feedDocument, imageElement,
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104 './rss:title');
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105 if (titleElement !== null) {
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106 this.title = titleElement.textContent.trim();
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107 }
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108 }
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109 }
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110
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111 class RSS2Logo extends FeedLogo {
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112 constructor(feedDocument, imageElement) {
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113 let urlElement = xpathQuery(feedDocument, imageElement, './url');
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114 if (urlElement === null) {
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115 throw new TypeError('missing <url> element in <logo> element');
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116 }
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117 let url = parseURL(urlElement.textContent.trim());
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118 if (url === null) {
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119 throw new TypeError('invalid URL in <logo> element');
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120 }
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121 super(url);
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122
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123 let titleElement = xpathQuery(feedDocument, imageElement, './title');
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124 if (titleElement !== null) {
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125 this.title = titleElement.textContent.trim();
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126 }
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127 }
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128 }
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129
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130 class AtomLogo extends FeedLogo {
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131 constructor(logoElement) {
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132 let url = parseURL(logoElement.textContent.trim());
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133 if (url === null) {
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134 throw new TypeError('invalid URL in <logo> element');
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135 }
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136 super(url);
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137 }
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138 }
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139
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140 class FeedEntryFile {
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141 constructor(url, type = browser.i18n.getMessage('defaultFileType'),
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142 size = 0) {
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143 this.url = url;
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144 let filename = url.pathname.split('/').pop();
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145 this.filename = filename !== '' ? filename :
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146 browser.i18n.getMessage('defaultFileName');
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147 this.type = type;
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148 this.size = size;
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149 }
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150 }
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151
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152 class RSS2EntryFile extends FeedEntryFile {
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153 constructor(enclosureElement) {
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154 let url = parseURL(enclosureElement.getAttribute('url'));
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155 if (url === null) {
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156 throw new TypeError('invalid URL in <enclosure> element');
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157 }
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158 super(url);
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159
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160 let type = enclosureElement.getAttribute('type');
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161 if (type !== null) {
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162 this.type = type;
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163 }
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164
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165 let size = parseInt(enclosureElement.getAttribute('length'), 10);
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166 if (!isNaN(size)) {
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167 this.size = size;
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168 }
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169 }
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170 }
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171
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172 class FeedEntry {
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173 constructor(title = browser.i18n.getMessage('defaultFeedEntryTitle'),
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174 url = null, date = new Date(0), content = '', files = []) {
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175 this.title = title;
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176 this.url = url;
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177 this.date = date;
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178 this.content = content;
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179 this.files = files;
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180 }
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181 }
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182
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183 class RSS1Entry extends FeedEntry {
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184 constructor(feedDocument, itemElement) {
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185 super();
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186
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187 let titleElement = xpathQuery(feedDocument, itemElement, './rss:title');
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188 if (titleElement !== null) {
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189 this.title = titleElement.textContent;
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190 }
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191
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192 let linkElement = xpathQuery(feedDocument, itemElement, './rss:link');
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193 if (linkElement !== null) {
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194 this.url = parseURL(linkElement.textContent);
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195 }
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196 }
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197 }
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198
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199 class RSS2Entry extends FeedEntry {
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200 constructor(feedDocument, itemElement) {
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201 super();
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202
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203 let titleElement = xpathQuery(feedDocument, itemElement, './title');
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204 if (titleElement !== null) {
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205 this.title = titleElement.textContent;
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206 }
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207
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208 let linkElement = xpathQuery(feedDocument, itemElement, './link');
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209 if (linkElement !== null) {
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210 this.url = parseURL(linkElement.textContent);
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211 }
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212
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213 let pubDateElement = xpathQuery(feedDocument, itemElement, './pubDate');
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214 if (pubDateElement !== null) {
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215 this.date = parseDate(pubDateElement.textContent);
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216 }
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217
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218 let descriptionElement = xpathQuery(feedDocument, itemElement,
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219 './description');
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220 if (descriptionElement !== null) {
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221 this.content = normalizeHTML(descriptionElement.textContent.trim());
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222 }
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223
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224 for (let enclosureElement of xpathQueryAll(feedDocument, itemElement,
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225 './enclosure')) {
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226 try {
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227 let entryFile = new RSS2EntryFile(enclosureElement);
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228 this.files.push(entryFile);
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229 } catch (e) {}
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parents:
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230 }
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parents:
diff changeset
231 }
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parents:
diff changeset
232 }
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233
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234 class AtomEntry extends FeedEntry {
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235 constructor(feedDocument, entryElement) {
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parents:
diff changeset
236 super();
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diff changeset
237
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238 let titleElement = xpathQuery(feedDocument, entryElement,
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diff changeset
239 './atom:title');
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parents:
diff changeset
240 if (titleElement !== null) {
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diff changeset
241 this.title = titleElement.textContent.trim();
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parents:
diff changeset
242 }
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
243
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parents:
diff changeset
244 let linkElement = xpathQuery(feedDocument, entryElement,
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
245 './atom:link[@href][@rel="alternate"]');
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parents:
diff changeset
246 if (linkElement !== null) {
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247 this.url = parseURL(linkElement.getAttribute('href'));
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diff changeset
248 }
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diff changeset
249
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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250 let updatedElement = xpathQuery(feedDocument, entryElement,
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
251 './atom:updated');
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diff changeset
252 if (updatedElement !== null) {
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diff changeset
253 this.date = parseDate(updatedElement.textContent);
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
254 }
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
255
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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diff changeset
256 let contentElement = xpathQuery(feedDocument, entryElement,
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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diff changeset
257 './atom:content');
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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diff changeset
258 if (contentElement === null) {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
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259 contentElement = xpathQuery(feedDocument, entryElement,
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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diff changeset
260 './atom:summary');
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
261 }
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
262 if (contentElement !== null) {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
263 let contentType = contentElement.getAttribute('type');
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
264 if (contentType === null) {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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diff changeset
265 contentType = 'text';
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
266 }
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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diff changeset
267 contentType = contentType.toLowerCase();
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
268 if (contentType === 'xhtml') {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
269 this.content = normalizeHTML(contentElement.innerHTML);
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
270 } else if (contentType === 'html') {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
271 this.content = normalizeHTML(contentElement.textContent);
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
272 } else {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
273 let encodedContent =
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
274 encodeXML(contentElement.textContent.trim());
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
275 this.content = normalizeHTML(`<pre>${encodedContent}</pre>`);
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
276 }
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
277 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
278 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
279 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
280
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
281 class Feed {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
282 constructor(title = browser.i18n.getMessage('defaultFeedTitle'),
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
283 subtitle = '', logo = null, entries = []) {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
284 this.title = title;
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
285 this.subtitle = subtitle;
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
286 this.logo = logo;
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
287 this.entries = entries;
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
288 }
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
289
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
290 async createPreviewDocument() {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
291 let url = browser.extension.getURL('web_resources/feed-preview.xhtml');
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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diff changeset
292 let response;
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
293 let text;
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
294 try {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
295 response = await fetch(url);
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
296 text = await response.text();
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
297 } catch (e) {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
298 console.log(`Error: failed to read preview template: ${e.message}`);
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
299 return;
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
300 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
301 let previewDocument = (new DOMParser()).parseFromString(text,
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
302 'application/xhtml+xml');
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
303
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
304 previewDocument.querySelector('base').href =
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
305 browser.extension.getURL('web_resources/');
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
306
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
307 previewDocument.querySelector('title').textContent = this.title;
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308 previewDocument.querySelector('#feed-title').textContent = this.title;
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309 previewDocument.querySelector('#feed-subtitle').textContent =
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310 this.subtitle;
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311 if (this.logo !== null) {
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312 let feedLogoTemplate =
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313 previewDocument.querySelector('#feed-logo-template');
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314 let logoNode = previewDocument.importNode(feedLogoTemplate.content,
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315 true);
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316 let imgElement = logoNode.querySelector('#feed-logo');
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317 imgElement.setAttribute('src', this.logo.url);
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318 imgElement.setAttribute('alt', this.logo.title);
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319 previewDocument.querySelector('#feed-header').prepend(logoNode);
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320 }
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321
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322 let entryTemplateElement =
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323 previewDocument.querySelector('#entry-template');
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324 let entryTitleTemplateElement =
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325 previewDocument.querySelector('#entry-title-template');
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326 let entryTitleLinkedTemplateElement =
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327 previewDocument.querySelector('#entry-title-linked-template');
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328 let entryFileListTemplateElement =
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329 previewDocument.querySelector('#entry-files-list-template');
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330 let entryFileTemplateElement =
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331 previewDocument.querySelector('#entry-file-template');
1
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332 if (this.entries.length === 0) {
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333 let hintTemplateElement =
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334 previewDocument.querySelector('#no-entries-hint-template');
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335 let hintNode =
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336 previewDocument.importNode(hintTemplateElement.content,
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337 true);
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338 hintNode.querySelector("#no-entries-hint").textContent =
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339 browser.i18n.getMessage('noEntriesHint');
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340
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341 previewDocument.body.append(hintNode);
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342 }
0
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343 for (let entry of this.entries) {
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344 let entryNode =
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345 previewDocument.importNode(entryTemplateElement.content,
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346 true);
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347 let titleElement;
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348 let titleNode;
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349
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350 if (entry.url !== null) {
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351 titleNode = previewDocument
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352 .importNode(entryTitleLinkedTemplateElement.content,
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353 true);
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354 titleElement = titleNode.querySelector('.entry-link');
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355 titleElement.href = entry.url;
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356 titleElement.title = entry.title;
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357 } else {
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358 titleNode = previewDocument
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359 .importNode(entryTitleTemplateElement.content, true);
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360 titleElement = titleNode.querySelector('.entry-title');
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361 }
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362 titleElement.textContent = entry.title;
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363 entryNode.querySelector('.entry-header').prepend(titleNode);
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364
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365 let timeElement = entryNode.querySelector('.entry-date > time');
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366 timeElement.textContent = entry.date.toLocaleString();
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367
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368 let contentElement = entryNode.querySelector('.entry-content');
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369 contentElement.srcdoc = entry.content;
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370 contentElement.title = entry.title;
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371
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372 if (entry.files.length > 0) {
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373 let fileListNode = previewDocument
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374 .importNode(entryFileListTemplateElement.content, true);
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375 fileListNode.querySelector('.entry-files-title').textContent =
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376 browser.i18n.getMessage('filesTitle');
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377 let fileListElement =
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378 fileListNode.querySelector('.entry-files-list');
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379
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380 for (let file of entry.files) {
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381 let fileNode = previewDocument
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382 .importNode(entryFileTemplateElement.content, true);
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383
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diff changeset
384 let fileLinkElement =
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385 fileNode.querySelector('.entry-file-link');
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386 fileLinkElement.href = file.url;
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diff changeset
387 fileLinkElement.title = file.filename;
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388 fileLinkElement.textContent = file.filename;
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diff changeset
389
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390 fileNode.querySelector('.entry-file-info').textContent =
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391 `(${file.type}, ${file.size} bytes)`;
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392
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393 fileListElement.appendChild(fileNode);
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diff changeset
394 }
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diff changeset
395
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396 entryNode.querySelector('.entry').append(fileListNode);
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diff changeset
397 }
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diff changeset
398
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399 previewDocument.body.append(entryNode);
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diff changeset
400 }
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diff changeset
401
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402 return previewDocument;
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parents:
diff changeset
403 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
404 }
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
405
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parents:
diff changeset
406 class RSS1Feed extends Feed {
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parents:
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407 constructor(feedDocument) {
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parents:
diff changeset
408 super();
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parents:
diff changeset
409
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diff changeset
410 let documentElement = feedDocument.documentElement;
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
411 let titleElement = xpathQuery(feedDocument, documentElement,
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
412 './rss:channel/rss:title');
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parents:
diff changeset
413 if (titleElement !== null) {
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414 this.title = titleElement.textContent;
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parents:
diff changeset
415 }
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parents:
diff changeset
416
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diff changeset
417 let descriptionElement = xpathQuery(feedDocument, documentElement,
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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diff changeset
418 './channel/description');
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parents:
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419 if (descriptionElement !== null) {
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420 this.subtitle = descriptionElement.textContent;
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
421 }
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diff changeset
422
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diff changeset
423 let imageElement = xpathQuery(feedDocument, documentElement,
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diff changeset
424 './rss:image');
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diff changeset
425 if (imageElement !== null) {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
426 try {
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diff changeset
427 let logo = new RSS1Logo(feedDocument, imageElement);
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
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diff changeset
428 this.logo = logo;
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
429 } catch (e) {}
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
430 }
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
431
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diff changeset
432 let itemElements = xpathQueryAll(feedDocument, documentElement,
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
433 './rss:item');
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diff changeset
434 for (let itemElement of itemElements) {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
435 let entry = new RSS1Entry(feedDocument, itemElement);
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
436 if (typeof entry !== 'undefined') {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
437 this.entries.push(entry);
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
438 }
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
439 }
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
440 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
441 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
442
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
443 class RSS2Feed extends Feed {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
444 constructor(feedDocument) {
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parents:
diff changeset
445 super();
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
446
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
447 let documentElement = feedDocument.documentElement;
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
448 let titleElement = xpathQuery(feedDocument, documentElement,
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
449 './channel/title');
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
450 if (titleElement !== null) {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
451 this.title = titleElement.textContent;
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
452 }
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
453
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
454 let descriptionElement = xpathQuery(feedDocument, documentElement,
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
455 './channel/description');
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
456 if (descriptionElement !== null) {
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
457 this.subtitle = descriptionElement.textContent;
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
458 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
459
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
460 let imageElement = xpathQuery(feedDocument, documentElement,
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
461 './channel/image');
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
462 if (imageElement !== null) {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
463 try {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
464 let logo = new RSS2Logo(feedDocument, imageElement);
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Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
465 this.logo = logo;
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
466 } catch (e) {}
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
467 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
468
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
469 let itemElements = xpathQueryAll(feedDocument, documentElement,
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
470 './channel/item');
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
471 for (let itemElement of itemElements) {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
472 let entry = new RSS2Entry(feedDocument, itemElement);
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
473 if (typeof entry !== 'undefined') {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
474 this.entries.push(entry);
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
475 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
476 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
477 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
478 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
479
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
480 class AtomFeed extends Feed {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
481 constructor(feedDocument, atomVersion) {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
482 super();
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
483
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
484 let documentElement = feedDocument.documentElement;
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
485 let titleElement = xpathQuery(feedDocument, documentElement,
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
486 './atom:title');
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
487 if (titleElement !== null) {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
488 this.title = titleElement.textContent.trim();
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
489 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
490
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
491 let subtitleElement = xpathQuery(feedDocument, documentElement,
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
492 './atom:subtitle');
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
493 if (subtitleElement !== null) {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
494 this.subtitle = subtitleElement.textContent.trim();
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
495 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
496
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
497 let logoElement = xpathQuery(feedDocument, documentElement,
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
498 './atom:logo');
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
499 if (logoElement !== null) {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
500 try {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
501 let logo = new AtomLogo(logoElement);
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
502 this.logo = logo;
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
503 } catch (e) {}
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
504 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
505
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
506 let entryElements = xpathQueryAll(feedDocument, documentElement,
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
507 './atom:entry');
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
508 for (let entryElement of entryElements) {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
509 this.entries.push(new AtomEntry(feedDocument, entryElement));
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
510 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
511 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
512 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
513
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
514 function probeFeedType(feedDocument) {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
515 if (feedDocument.documentElement.nodeName === 'feed') {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
516 let version = feedDocument.documentElement.getAttribute('version');
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
517 if (version === null) {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
518 version = '1.0';
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
519 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
520 for (let attr of feedDocument.documentElement.attributes) {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
521 if (attr.name === 'xmlns' &&
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
522 attr.value === 'http://www.w3.org/2005/Atom') {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
523 return ['atom', version];
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
524 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
525 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
526 } else if (feedDocument.documentElement.nodeName === 'rss') {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
527 let version = feedDocument.documentElement.getAttribute('version');
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
528 if (version !== null) {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
529 return ['rss', version];
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
530 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
531 } else if (feedDocument.documentElement.localName.toLowerCase() === 'rdf') {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
532 for (let attr of feedDocument.documentElement.attributes) {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
533 if (attr.name === 'xmlns' &&
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
534 attr.value === 'http://my.netscape.com/rdf/simple/0.9/') {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
535 return ['rss', '0.9'];
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
536 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
537 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
538 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
539
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
540 return [undefined, undefined];
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
541 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
542
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
543 async function replaceDocumentWithPreview(type, version) {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
544 let feed;
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
545 switch (type) {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
546 case 'rss':
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
547 switch (version) {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
548 case '0.9':
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
549 case '1.0':
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
550 feed = new RSS1Feed(document, version);
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
551 break;
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
552 case '0.90':
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
553 case '0.91':
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
554 case '0.92':
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
555 case '0.93':
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
556 case '0.94':
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
557 case '2.0':
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
558 feed = new RSS2Feed(document, version);
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
559 break;
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
560 default:
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
561 return;
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
562 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
563 break;
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
564 case 'atom':
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
565 feed = new AtomFeed(document, version);
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
566 break;
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
567 default:
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
568 return;
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
569 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
570
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
571 // replace original document with preview
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
572 let previewDocument = await feed.createPreviewDocument();
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
573 if (typeof previewDocument === 'undefined') {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
574 return;
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
575 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
576 let documentElement = previewDocument.documentElement;
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
577 document.replaceChild(document.importNode(documentElement, true),
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
578 document.documentElement);
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
579 }
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
580
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
581 let [type, version] = probeFeedType(document);
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
582 if (typeof type !== 'undefined') {
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
583 replaceDocumentWithPreview(type, version);
bc5cc170163c Initial revision
Guido Berhoerster <guido+feed-preview@berhoerster.name>
parents:
diff changeset
584 }