annotate options/options.js @ 10:ff5e5e3eba32

Implement feed subscription for web-based feed readers Add options page for configuring web-based feed readers which allow for subscribing to feeds via GET requests. Track tabs containing feed previews and inject a content script which retrieves the configured feed readers and keeps them in sync.
author Guido Berhoerster <guido+feed-preview@berhoerster.name>
date Fri, 07 Dec 2018 23:00:41 +0100
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children 688d75e554e0
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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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11 function normalizeURL(text) {
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12 return new URL(text).toString();
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13 }
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14
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15 class OptionsPage {
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16 constructor() {
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17 this.selectedFeedReader = -1;
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18
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19 document.querySelector('#feed-readers-title').textContent =
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20 browser.i18n.getMessage('feedReadersTitle');
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21
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22 let feedReadersForm = document.forms['feed-readers'];
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23 feedReadersForm.elements['move-up'].textContent =
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24 browser.i18n.getMessage('feedReaderMoveUpButton');
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25 feedReadersForm.elements['move-down'].textContent =
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26 browser.i18n.getMessage('feedReaderMoveDownButton');
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27 feedReadersForm.elements['remove'].textContent =
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28 browser.i18n.getMessage('feedReaderRemoveButton');
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29 feedReadersForm.addEventListener('change', this);
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30
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31 let addFeedReaderForm = document.forms['add-feed-reader'];
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32 addFeedReaderForm.elements['add'].textContent =
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33 browser.i18n.getMessage('feedReaderAddButton');
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34 let titleElement = addFeedReaderForm.elements['title'];
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35 titleElement.labels[0].textContent =
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36 browser.i18n.getMessage('feedReaderTitleLabel');
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37 titleElement.placeholder =
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38 browser.i18n.getMessage('feedReaderTitlePlaceholder');
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39 let urlTemplateElement =
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40 addFeedReaderForm.elements['url-template'];
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41 urlTemplateElement.labels[0].textContent =
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42 browser.i18n.getMessage('feedReaderUrlTemplateLabel');
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43 urlTemplateElement.placeholder =
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44 browser.i18n.getMessage('feedReaderUrlTemplatePlaceholder');
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45 document.querySelector('#feed-reader-url-caption').textContent =
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46 browser.i18n.getMessage('feedReaderUrlTemplateCaption');
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47 addFeedReaderForm.addEventListener('focusout', this);
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48
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49 document.addEventListener('submit', this);
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50
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51 this.initOptions();
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52 }
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53
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54 async initOptions() {
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55 let {feedReaders} = await browser.storage.sync.get('feedReaders');
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56 if (Array.isArray(feedReaders)) {
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57 console.log('initialized feedReaders from storage', feedReaders);
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58 this.updateFeedReaders(feedReaders);
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59 }
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60
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61 browser.storage.onChanged.addListener(this.onStorageChanged.bind(this));
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62 }
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63
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64 validateURLTemplate(text) {
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65 let url;
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66 try {
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67 url = new URL(text);
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68 } catch(e) {
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69 if (e instanceof TypeError) {
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70 return browser.i18n.getMessage('invalidURLError');
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71 }
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72 throw e;
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73 }
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74
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75 if (url.protocol !== 'http:' && url.protocol !== 'https:') {
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76 return browser.i18n.getMessage('invalidProtocolError');
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77 }
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78
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79 if (!(url.pathname.includes('%s') || url.search.includes('%s'))) {
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80 return browser.i18n.getMessage('missingPlaceholderError');
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81 }
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82
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83 return '';
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84 }
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85
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86 updateFeedReaders(feedReaders) {
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87 let feedReadersForm = document.forms['feed-readers'];
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88 let feedReaderItemElements =
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89 feedReadersForm.querySelectorAll('.feed-reader-item');
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90 for (let feedReaderItemElement of feedReaderItemElements) {
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91 feedReaderItemElement.remove();
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92 }
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93
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94 let feedReaderItemTemplateElement =
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95 document.querySelector('#feed-reader-item-template');
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96 let feedReaderSelectionElement =
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97 feedReadersForm.querySelector('#feed-reader-selection')
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98 for (let feedReader of feedReaders) {
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99 let feedReaderItemNode =
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100 document.importNode(feedReaderItemTemplateElement.content,
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101 true);
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102 let feedReaderInputElement =
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103 feedReaderItemNode.querySelector('input[name=feed-reader]');
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104 feedReaderInputElement.dataset.title = feedReader.title;
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105 feedReaderInputElement.value = feedReader.urlTemplate;
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106 feedReaderItemNode.querySelector('.feed-reader-title')
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107 .textContent = feedReader.title;
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108 feedReaderItemNode.querySelector('.feed-reader-url-template')
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109 .textContent = feedReader.urlTemplate;
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110 feedReaderSelectionElement.append(feedReaderItemNode);
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111 }
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112
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113 feedReadersForm.elements['buttons'].disabled = true;
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114 }
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115
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116 getFeedReaders() {
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117 let feedReaderInput =
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118 document.forms['feed-readers'].elements['feed-reader'];
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119 if (feedReaderInput instanceof RadioNodeList) {
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120 return Array.from(feedReaderInput);
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121 } else if (typeof feedReaderInput === 'undefined') {
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122 return [];
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123 }
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124 return Array.from([feedReaderInput]);
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125 }
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126
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127 selectFeedReader() {
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128 console.debug('selected:', this.selectedFeedReader);
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129 if (this.selectedFeedReader < 0) {
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130 return;
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131 }
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132
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133 let feedReadersForm = document.forms['feed-readers'];
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134 let feedReaderElements = this.getFeedReaders();
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135 feedReaderElements[this.selectedFeedReader].checked = true;
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136 // ensure that the checked element will also be the focused one the
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137 // next time the radio input group receives focus
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138 let activeElement = document.activeElement;
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139 feedReaderElements[this.selectedFeedReader].focus();
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140 activeElement.focus();
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141
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142 feedReadersForm.elements['buttons'].disabled = false;
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143 }
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144
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145 serializeFeedReaders() {
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146 return this.getFeedReaders().map(element => ({
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147 title: element.dataset.title,
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148 urlTemplate: element.value
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149 }));
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150 }
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151
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152 onStorageChanged(changes, areaName) {
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153 if (areaName !== 'sync' || typeof changes.feedReaders === 'undefined') {
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154 return;
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155 }
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156
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157 let feedReaders;
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158 if (typeof changes.feedReaders.newValue !== 'undefined' &&
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159 Array.isArray(changes.feedReaders.newValue)) {
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160 feedReaders = changes.feedReaders.newValue;
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161 console.log('feedReaders changed to', feedReaders);
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162 } else {
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163 // list of feed readers was removed or set to nonsensical value
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164 feedReaders = [];
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165 console.log('feedReaders was removed');
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166 }
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167 if (this.selectedFeedReader >= feedReaders.length) {
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168 // save selected feed reader is no longer valid
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169 this.selectedFeedReader = -1;
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170 }
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171 this.updateFeedReaders(feedReaders);
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172 this.selectFeedReader();
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173 }
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174
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175 handleEvent(ev) {
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176 console.log('previously selected:', this.selectedFeedReader);
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177 if (ev.type === 'change' && ev.target.name === 'feed-reader') {
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178 // feed reader was selected by user interaction
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179 console.debug(ev);
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180 this.selectedFeedReader = this.getFeedReaders().indexOf(ev.target);
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181 console.log('now selected:', this.selectedFeedReader);
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182
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183 document.forms['feed-readers'].elements['buttons'].disabled = false;
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184 } else if (ev.type === 'submit' && ev.target.id === 'feed-readers') {
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185 // remove feed reader or move feed reader up or down
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186 ev.preventDefault();
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187
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188 let feedReaders = this.serializeFeedReaders();
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189 if (ev.explicitOriginalTarget.name === 'move-up') {
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190 if (this.selectedFeedReader - 1 < 0) {
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191 // the first feed reader is selected
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192 return;
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193 }
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194 [feedReaders[this.selectedFeedReader - 1],
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195 feedReaders[this.selectedFeedReader]] =
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196 [feedReaders[this.selectedFeedReader],
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197 feedReaders[this.selectedFeedReader - 1]];
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198 this.selectedFeedReader--;
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199 } else if (ev.explicitOriginalTarget.name === 'move-down') {
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200 if (this.selectedFeedReader + 1 === feedReaders.length) {
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201 // the last feed reader is selected
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202 return;
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203 }
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204 [feedReaders[this.selectedFeedReader + 1],
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205 feedReaders[this.selectedFeedReader]] =
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206 [feedReaders[this.selectedFeedReader],
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207 feedReaders[this.selectedFeedReader + 1]];
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208 this.selectedFeedReader++;
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209 } else if (ev.explicitOriginalTarget.name === 'remove') {
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210 feedReaders.splice(this.selectedFeedReader, 1);
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211 this.selectedFeedReader--;
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212 }
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213 browser.storage.sync.set({feedReaders});
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214 console.log('set feedReaders to ', feedReaders);
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215 } else if (ev.type === 'focusout' &&
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216 ev.target.name === 'url-template') {
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217 // url template was changed
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218 let validity = this.validateURLTemplate(ev.target.value);
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219 ev.target.setCustomValidity(validity);
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220 } else if (ev.type === 'submit' &&
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221 ev.target.id === 'add-feed-reader') {
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222 // feed reader added
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223 ev.preventDefault();
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224
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225 let urlTemplate = ev.target.elements['url-template'].value;
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226 let isValid = this.validateURLTemplate(urlTemplate);
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227 ev.target.elements['url-template'].setCustomValidity(isValid);
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228 if (!ev.target.reportValidity()) {
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229 return;
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230 }
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231
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232 let feedReaders = this.serializeFeedReaders();
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233 feedReaders.push({
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234 title: ev.target.elements['title'].value,
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235 urlTemplate: normalizeURL(urlTemplate)
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236 });
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237 browser.storage.sync.set({feedReaders});
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238 console.log('set feedReaders to', feedReaders);
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239
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240 document.forms['add-feed-reader'].reset();
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241 }
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242 }
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243 }
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244
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245 var page = new OptionsPage();