Mercurial > addons > firefox-addons > feed-preview

annotate content_scripts/feed-readers.js @ 10:ff5e5e3eba32

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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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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 updateFeedReaders(feedReaders) {
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12 let feedReaderSelectionElement = document.forms['feed-subscription']
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13 .elements['feed-reader-selection'];
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14 for (let optionElement of
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15 feedReaderSelectionElement.querySelectorAll('option')) {
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16 optionElement.remove();
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17 }
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19 for (let feedReader of feedReaders) {
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20 let optionElement = document.createElement('option');
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21 optionElement.value = feedReader.urlTemplate;
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22 optionElement.textContent = feedReader.title;
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23 feedReaderSelectionElement.append(optionElement);
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24 }
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25
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26 document.forms['feed-subscription'].elements['main'].disabled =
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27 feedReaders.length === 0;
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28 }
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29
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30 document.addEventListener('submit', ev => {
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31 if (ev.target.id !== 'feed-subscription') {
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32 return;
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33 }
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34
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35 ev.preventDefault();
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36 let subscribeUrl = ev.target.elements['feed-reader-selection'].value
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37 .replace('%s', encodeURIComponent(document.documentURI));
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38 console.log(`subscribing to feed using ${subscribeUrl}`);
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39 window.location.href = subscribeUrl;
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40 });
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41
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42 function onStorageChanged(changes, areaName) {
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43 if (areaName !== 'sync' || changes.feedReaders === 'undefined') {
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44 return;
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45 }
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46
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47 // stored feed readers have been changed or deleted
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48 let feedReaders = typeof changes.feedReaders.newValue !== 'undefined' ?
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49 changes.feedReaders.newValue : [];
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50 console.log('feedReaders changed to', feedReaders);
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51 updateFeedReaders(feedReaders);
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52 }
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53
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54 (async () => {
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55 // initialize subscription form
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56 let {feedReaders = []} = await browser.storage.sync.get('feedReaders');
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57 updateFeedReaders(feedReaders);
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58
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59 browser.storage.onChanged.addListener(onStorageChanged);
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60 })();