/* -*- indent-tabs-mode: nil; js-indent-level: 4 -*- * vim: sw=4 ts=4 sts=4 et filetype=javascript * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ this.EXPORTED_SYMBOLS = [ "NetUtil", ]; /** * Necko utilities */ //////////////////////////////////////////////////////////////////////////////// //// Constants const Ci = Components.interfaces; const Cc = Components.classes; const Cr = Components.results; const Cu = Components.utils; const PR_UINT32_MAX = 0xffffffff; Components.utils.import("resource://gre/modules/XPCOMUtils.jsm"); Components.utils.import("resource://gre/modules/Services.jsm"); //////////////////////////////////////////////////////////////////////////////// //// NetUtil Object this.NetUtil = { /** * Function to perform simple async copying from aSource (an input stream) * to aSink (an output stream). The copy will happen on some background * thread. Both streams will be closed when the copy completes. * * @param aSource * The input stream to read from * @param aSink * The output stream to write to * @param aCallback [optional] * A function that will be called at copy completion with a single * argument: the nsresult status code for the copy operation. * * @return An nsIRequest representing the copy operation (for example, this * can be used to cancel the copying). The consumer can ignore the * return value if desired. */ asyncCopy: function NetUtil_asyncCopy(aSource, aSink, aCallback = null) { if (!aSource || !aSink) { let exception = new Components.Exception( "Must have a source and a sink", Cr.NS_ERROR_INVALID_ARG, Components.stack.caller ); throw exception; } // make a stream copier var copier = Cc["@mozilla.org/network/async-stream-copier;1"]. createInstance(Ci.nsIAsyncStreamCopier2); copier.init(aSource, aSink, null /* Default event target */, 0 /* Default length */, true, true /* Auto-close */); var observer; if (aCallback) { observer = { onStartRequest: function(aRequest, aContext) {}, onStopRequest: function(aRequest, aContext, aStatusCode) { aCallback(aStatusCode); } } } else { observer = null; } // start the copying copier.QueryInterface(Ci.nsIAsyncStreamCopier).asyncCopy(observer, null); return copier; }, /** * Asynchronously opens a source and fetches the response. While the fetch * is asynchronous, I/O may happen on the main thread. When reading from * a local file, prefer using "OS.File" methods instead. * * @param aSource * This argument can be one of the following: * - An options object that will be passed to NetUtil.newChannel. * - An existing nsIChannel. * - An existing nsIInputStream. * Using an nsIURI, nsIFile, or string spec directly is deprecated. * @param aCallback * The callback function that will be notified upon completion. It * will get these arguments: * 1) An nsIInputStream containing the data from aSource, if any. * 2) The status code from opening the source. * 3) Reference to the nsIRequest. */ asyncFetch: function NetUtil_asyncFetch(aSource, aCallback) { if (!aSource || !aCallback) { let exception = new Components.Exception( "Must have a source and a callback", Cr.NS_ERROR_INVALID_ARG, Components.stack.caller ); throw exception; } // Create a pipe that will create our output stream that we can use once // we have gotten all the data. let pipe = Cc["@mozilla.org/pipe;1"]. createInstance(Ci.nsIPipe); pipe.init(true, true, 0, PR_UINT32_MAX, null); // Create a listener that will give data to the pipe's output stream. let listener = Cc["@mozilla.org/network/simple-stream-listener;1"]. createInstance(Ci.nsISimpleStreamListener); listener.init(pipe.outputStream, { onStartRequest: function(aRequest, aContext) {}, onStopRequest: function(aRequest, aContext, aStatusCode) { pipe.outputStream.close(); aCallback(pipe.inputStream, aStatusCode, aRequest); } }); // Input streams are handled slightly differently from everything else. if (aSource instanceof Ci.nsIInputStream) { let pump = Cc["@mozilla.org/network/input-stream-pump;1"]. createInstance(Ci.nsIInputStreamPump); pump.init(aSource, -1, -1, 0, 0, true); pump.asyncRead(listener, null); return; } let channel = aSource; if (!(channel instanceof Ci.nsIChannel)) { channel = this.newChannel(aSource); } try { channel.asyncOpen(listener, null); } catch (e) { let exception = new Components.Exception( "Failed to open input source '" + channel.originalURI.spec + "'", e.result, Components.stack.caller, aSource, e ); throw exception; } }, /** * Constructs a new URI for the given spec, character set, and base URI, or * an nsIFile. * * @param aTarget * The string spec for the desired URI or an nsIFile. * @param aOriginCharset [optional] * The character set for the URI. Only used if aTarget is not an * nsIFile. * @param aBaseURI [optional] * The base URI for the spec. Only used if aTarget is not an * nsIFile. * * @return an nsIURI object. */ newURI: function NetUtil_newURI(aTarget, aOriginCharset, aBaseURI) { if (!aTarget) { let exception = new Components.Exception( "Must have a non-null string spec or nsIFile object", Cr.NS_ERROR_INVALID_ARG, Components.stack.caller ); throw exception; } if (aTarget instanceof Ci.nsIFile) { return this.ioService.newFileURI(aTarget); } return this.ioService.newURI(aTarget, aOriginCharset, aBaseURI); }, /** * Constructs a new channel for the given source. * * Keep in mind that URIs coming from a webpage should *never* use the * systemPrincipal as the loadingPrincipal. * * @param aWhatToLoad * This argument used to be a string spec for the desired URI, an * nsIURI, or an nsIFile. Now it should be an options object with * the following properties: * { * uri: * The full URI spec string or nsIURI to create the channel for. * Note that this cannot be an nsIFile and you cannot specify a * non-default charset or base URI. Call NetUtil.newURI first if * you need to construct an URI using those options. * loadingNode: * The loadingDocument of the channel. * The element or document where the result of this request will * be used. This is the document/element that will get access to * the result of this request. For example for an image load, * it's the document in which the image will be loaded. And for * a CSS stylesheet it's the document whose rendering will be * affected by the stylesheet. * If possible, pass in the element which is performing the load. * But if the load is coming from a JS API (such as * XMLHttpRequest) or if the load might be coalesced across * multiple elements (such as for ) then pass in the * Document node instead. * For loads that are not related to any document, such as loads * coming from addons or internal browser features, omit this * property and specify a loadingPrincipal or * loadUsingSystemPrincipal instead. * loadingPrincipal: * The loadingPrincipal of the channel. * The principal of the document where the result of this request * will be used. * This defaults to the principal of aLoadingNode, so when * aLoadingNode is passed this can be left as null. However for * loads where aLoadingNode is null this argument must be passed. * For example for loads from a WebWorker, pass the principal of * that worker. For loads from an addon or from internal browser * features, pass the system principal. * This principal should almost always be the system principal if * loadingNode is omitted, in which case you can use the * useSystemPrincipal property. The only exception to this is * for loads from WebWorkers since they don't have any nodes to * be passed as loadingNode. * Please note, loadingPrincipal is *not* the principal of the * resource being loaded, but rather the principal of the context * where the resource will be used. * loadUsingSystemPrincipal: * Set this to true to use the system principal as * loadingPrincipal. This must be omitted if loadingPrincipal or * loadingNode are present. * This should be used with care as it skips security checks. * triggeringPrincipal: * The triggeringPrincipal of the load. * The triggeringPrincipal is the principal of the resource that * caused this particular URL to be loaded. * Most likely the triggeringPrincipal and the loadingPrincipal * are identical, in which case the triggeringPrincipal can be * left out. In some cases the loadingPrincipal and the * triggeringPrincipal are different however, e.g. a stylesheet * may import a subresource. In that case the principal of the * stylesheet which contains the import command is the * triggeringPrincipal, and the principal of the document whose * rendering is affected is the loadingPrincipal. * securityFlags: * The securityFlags of the channel. * Any of the securityflags defined in nsILoadInfo.idl. * contentPolicyType: * The contentPolicyType of the channel. * Any of the content types defined in nsIContentPolicy.idl. * } * @param aOriginCharset [deprecated] * The character set for the URI. Only used if aWhatToLoad is a * string, which is a deprecated API. Must be undefined otherwise. * Use NetUtil.newURI if you need to use this option. * @param aBaseURI [deprecated] * The base URI for the spec. Only used if aWhatToLoad is a string, * which is a deprecated API. Must be undefined otherwise. Use * NetUtil.newURI if you need to use this option. * * @return an nsIChannel object. */ newChannel: function NetUtil_newChannel(aWhatToLoad, aOriginCharset, aBaseURI) { // Check for the deprecated API first. if (typeof aWhatToLoad == "string" || (aWhatToLoad instanceof Ci.nsIFile) || (aWhatToLoad instanceof Ci.nsIURI)) { let uri = (aWhatToLoad instanceof Ci.nsIURI) ? aWhatToLoad : this.newURI(aWhatToLoad, aOriginCharset, aBaseURI); return this.ioService.newChannelFromURI(uri); } // We are using the updated API, that requires only the options object. if (typeof aWhatToLoad != "object" || aOriginCharset !== undefined || aBaseURI !== undefined) { throw new Components.Exception( "newChannel requires a single object argument", Cr.NS_ERROR_INVALID_ARG, Components.stack.caller ); } let { uri, loadingNode, loadingPrincipal, loadUsingSystemPrincipal, triggeringPrincipal, securityFlags, contentPolicyType } = aWhatToLoad; if (!uri) { throw new Components.Exception( "newChannel requires the 'uri' property on the options object.", Cr.NS_ERROR_INVALID_ARG, Components.stack.caller ); } if (typeof uri == "string") { uri = this.newURI(uri); } if (!loadingNode && !loadingPrincipal && !loadUsingSystemPrincipal) { throw new Components.Exception( "newChannel requires at least one of the 'loadingNode'," + " 'loadingPrincipal', or 'loadUsingSystemPrincipal'" + " properties on the options object.", Cr.NS_ERROR_INVALID_ARG, Components.stack.caller ); } if (loadUsingSystemPrincipal === true) { if (loadingNode || loadingPrincipal) { throw new Components.Exception( "newChannel does not accept 'loadUsingSystemPrincipal'" + " if the 'loadingNode' or 'loadingPrincipal' properties" + " are present on the options object.", Cr.NS_ERROR_INVALID_ARG, Components.stack.caller ); } loadingPrincipal = Services.scriptSecurityManager .getSystemPrincipal(); } else if (loadUsingSystemPrincipal !== undefined) { throw new Components.Exception( "newChannel requires the 'loadUsingSystemPrincipal'" + " property on the options object to be 'true' or 'undefined'.", Cr.NS_ERROR_INVALID_ARG, Components.stack.caller ); } if (securityFlags === undefined) { securityFlags = loadUsingSystemPrincipal ? Ci.nsILoadInfo.SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL : Ci.nsILoadInfo.SEC_NORMAL; } if (contentPolicyType === undefined) { if (!loadUsingSystemPrincipal) { throw new Components.Exception( "newChannel requires the 'contentPolicyType' property on" + " the options object unless loading from system principal.", Cr.NS_ERROR_INVALID_ARG, Components.stack.caller ); } contentPolicyType = Ci.nsIContentPolicy.TYPE_OTHER; } return this.ioService.newChannelFromURI2(uri, loadingNode || null, loadingPrincipal || null, triggeringPrincipal || null, securityFlags, contentPolicyType); }, /** * Reads aCount bytes from aInputStream into a string. * * @param aInputStream * The input stream to read from. * @param aCount * The number of bytes to read from the stream. * @param aOptions [optional] * charset * The character encoding of stream data. * replacement * The character to replace unknown byte sequences. * If unset, it causes an exceptions to be thrown. * * @return the bytes from the input stream in string form. * * @throws NS_ERROR_INVALID_ARG if aInputStream is not an nsIInputStream. * @throws NS_BASE_STREAM_WOULD_BLOCK if reading from aInputStream would * block the calling thread (non-blocking mode only). * @throws NS_ERROR_FAILURE if there are not enough bytes available to read * aCount amount of data. * @throws NS_ERROR_ILLEGAL_INPUT if aInputStream has invalid sequences */ readInputStreamToString: function NetUtil_readInputStreamToString(aInputStream, aCount, aOptions) { if (!(aInputStream instanceof Ci.nsIInputStream)) { let exception = new Components.Exception( "First argument should be an nsIInputStream", Cr.NS_ERROR_INVALID_ARG, Components.stack.caller ); throw exception; } if (!aCount) { let exception = new Components.Exception( "Non-zero amount of bytes must be specified", Cr.NS_ERROR_INVALID_ARG, Components.stack.caller ); throw exception; } if (aOptions && "charset" in aOptions) { let cis = Cc["@mozilla.org/intl/converter-input-stream;1"]. createInstance(Ci.nsIConverterInputStream); try { // When replacement is set, the character that is unknown sequence // replaces with aOptions.replacement character. if (!("replacement" in aOptions)) { // aOptions.replacement isn't set. // If input stream has unknown sequences for aOptions.charset, // throw NS_ERROR_ILLEGAL_INPUT. aOptions.replacement = 0; } cis.init(aInputStream, aOptions.charset, aCount, aOptions.replacement); let str = {}; cis.readString(-1, str); cis.close(); return str.value; } catch (e) { // Adjust the stack so it throws at the caller's location. throw new Components.Exception(e.message, e.result, Components.stack.caller, e.data); } } let sis = Cc["@mozilla.org/scriptableinputstream;1"]. createInstance(Ci.nsIScriptableInputStream); sis.init(aInputStream); try { return sis.readBytes(aCount); } catch (e) { // Adjust the stack so it throws at the caller's location. throw new Components.Exception(e.message, e.result, Components.stack.caller, e.data); } }, /** * Returns a reference to nsIIOService. * * @return a reference to nsIIOService. */ get ioService() { delete this.ioService; return this.ioService = Cc["@mozilla.org/network/io-service;1"]. getService(Ci.nsIIOService); }, };