The Tor Browser / file comparison
comparison: toolkit/components/url-classifier/content/xml-fetcher.js
toolkit/components/url-classifier/content/xml-fetcher.js
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:a8d9c1683836 |
|---|---|
| 1 # This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 # License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 # file, You can obtain one at http://mozilla.org/MPL/2.0/. | |
| 4 | |
| 5 // A simple class that encapsulates a request. You'll notice the | |
| 6 // style here is different from the rest of the extension; that's | |
| 7 // because this was re-used from really old code we had. At some | |
| 8 // point it might be nice to replace this with something better | |
| 9 // (e.g., something that has explicit onerror handler, ability | |
| 10 // to set headers, and so on). | |
| 11 | |
| 12 /** | |
| 13 * Because we might be in a component, we can't just assume that | |
| 14 * XMLHttpRequest exists. So we use this tiny factory function to wrap the | |
| 15 * XPCOM version. | |
| 16 * | |
| 17 * @return XMLHttpRequest object | |
| 18 */ | |
| 19 function PROT_NewXMLHttpRequest() { | |
| 20 var Cc = Components.classes; | |
| 21 var Ci = Components.interfaces; | |
| 22 var request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"] | |
| 23 .createInstance(Ci.nsIXMLHttpRequest); | |
| 24 // Need the following so we get onerror/load/progresschange | |
| 25 request.QueryInterface(Ci.nsIJSXMLHttpRequest); | |
| 26 return request; | |
| 27 } | |
| 28 | |
| 29 /** | |
| 30 * A helper class that does HTTP GETs and calls back a function with | |
| 31 * the content it receives. Asynchronous, so uses a closure for the | |
| 32 * callback. | |
| 33 * | |
| 34 * Note, that XMLFetcher is only used for SafeBrowsing, therefore | |
| 35 * we inherit from nsILoadContext, so we can use the callbacks on the | |
| 36 * channel to separate the safebrowsing cookie based on a reserved | |
| 37 * appId. | |
| 38 * @constructor | |
| 39 */ | |
| 40 function PROT_XMLFetcher() { | |
| 41 this.debugZone = "xmlfetcher"; | |
| 42 this._request = PROT_NewXMLHttpRequest(); | |
| 43 // implements nsILoadContext | |
| 44 this.appId = Ci.nsIScriptSecurityManager.SAFEBROWSING_APP_ID; | |
| 45 this.isInBrowserElement = false; | |
| 46 this.usePrivateBrowsing = false; | |
| 47 this.isContent = false; | |
| 48 } | |
| 49 | |
| 50 PROT_XMLFetcher.prototype = { | |
| 51 /** | |
| 52 * Function that will be called back upon fetch completion. | |
| 53 */ | |
| 54 _callback: null, | |
| 55 | |
| 56 | |
| 57 /** | |
| 58 * Fetches some content. | |
| 59 * | |
| 60 * @param page URL to fetch | |
| 61 * @param callback Function to call back when complete. | |
| 62 */ | |
| 63 get: function(page, callback) { | |
| 64 this._request.abort(); // abort() is asynchronous, so | |
| 65 this._request = PROT_NewXMLHttpRequest(); | |
| 66 this._callback = callback; | |
| 67 var asynchronous = true; | |
| 68 this._request.open("GET", page, asynchronous); | |
| 69 this._request.channel.notificationCallbacks = this; | |
| 70 | |
| 71 // Create a closure | |
| 72 var self = this; | |
| 73 this._request.addEventListener("readystatechange", function() { | |
| 74 self.readyStateChange(self); | |
| 75 }, false); | |
| 76 | |
| 77 this._request.send(null); | |
| 78 }, | |
| 79 | |
| 80 cancel: function() { | |
| 81 this._request.abort(); | |
| 82 this._request = null; | |
| 83 }, | |
| 84 | |
| 85 /** | |
| 86 * Called periodically by the request to indicate some state change. 4 | |
| 87 * means content has been received. | |
| 88 */ | |
| 89 readyStateChange: function(fetcher) { | |
| 90 if (fetcher._request.readyState != 4) | |
| 91 return; | |
| 92 | |
| 93 // If the request fails, on trunk we get status set to | |
| 94 // NS_ERROR_NOT_AVAILABLE. On 1.8.1 branch we get an exception | |
| 95 // forwarded from nsIHttpChannel::GetResponseStatus. To be consistent | |
| 96 // between branch and trunk, we send back NS_ERROR_NOT_AVAILABLE for | |
| 97 // http failures. | |
| 98 var responseText = null; | |
| 99 var status = Components.results.NS_ERROR_NOT_AVAILABLE; | |
| 100 try { | |
| 101 G_Debug(this, "xml fetch status code: \"" + | |
| 102 fetcher._request.status + "\""); | |
| 103 status = fetcher._request.status; | |
| 104 responseText = fetcher._request.responseText; | |
| 105 } catch(e) { | |
| 106 G_Debug(this, "Caught exception trying to read xmlhttprequest " + | |
| 107 "status/response."); | |
| 108 G_Debug(this, e); | |
| 109 } | |
| 110 if (fetcher._callback) | |
| 111 fetcher._callback(responseText, status); | |
| 112 }, | |
| 113 | |
| 114 // nsIInterfaceRequestor | |
| 115 getInterface: function(iid) { | |
| 116 return this.QueryInterface(iid); | |
| 117 }, | |
| 118 | |
| 119 QueryInterface: XPCOMUtils.generateQI([Ci.nsIInterfaceRequestor, | |
| 120 Ci.nsISupports, | |
| 121 Ci.nsILoadContext]) | |
| 122 }; |
