Mercurial > addons > firefox-addons > feed-preview

annotate background.js @ 0:bc5cc170163c

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Initial revision
author Guido Berhoerster <guido+feed-preview@berhoerster.name>
date Wed, 03 Oct 2018 23:40:57 +0200
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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 var tabsFeeds = new Map();
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12
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13 // until content handlers become available to webextensions
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14 // (https://bugzilla.mozilla.org/show_bug.cgi?id=1457500) intercept all
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15 // responses and change the content type from application/atom+xml or
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16 // application/rss+xml to application/xml which will then be handled by a
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17 // content script
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18 browser.webRequest.onHeadersReceived.addListener(details => {
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19 if (details.statusCode != 200 ||
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20 typeof details.responseHeaders === 'undefined') {
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21 return;
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22 }
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23
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24 let contentTypeHeader = details.responseHeaders.find(element => {
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25 return element.name.toLowerCase() === 'content-type';
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26 });
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27 if (typeof contentTypeHeader !== 'undefined') {
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28 let contentType = contentTypeHeader.value.split(';');
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29 let mediaType = contentType[0].trim().toLowerCase();
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30 if (mediaType === 'application/atom+xml' ||
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31 mediaType === 'application/rss+xml') {
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32 contentType[0] = 'application/xml';
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33 contentTypeHeader.value = contentType.join(';');
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34 }
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35 }
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36
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37 return {responseHeaders: details.responseHeaders};
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38 }, {urls: ['http://*/*', 'https://*/*'], types: ['main_frame']},
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39 ['blocking', 'responseHeaders']);
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40
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41 browser.runtime.onMessage.addListener((request, sender, sendResponse) => {
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42 let tab = sender.tab;
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43 if (typeof tab !== 'undefined') {
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44 // content script sending feeds
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45 tabsFeeds.set(tab.id, request);
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46 browser.pageAction.show(tab.id);
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47 } else {
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48 let response = tabsFeeds.get(request);
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49 // popup querying feeds
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50 sendResponse(tabsFeeds.get(request));
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51 }
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52 });
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53
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54 browser.tabs.onUpdated.addListener((id, changeInfo, tab) => {
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55 if (typeof changeInfo.url === 'undefined') {
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56 // filter out updates which do not change the URL
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57 return;
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58 }
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59
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60 // hide the page action when the URL changes since it is no longer valid,
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61 // it will be shown again if the content script detects a feed
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62 browser.pageAction.hide(tab.id);
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63 });
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64
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65 browser.tabs.onRemoved.addListener((tabId, removeInfo) => {
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66 tabsFeeds.delete(tabId);
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67 });