зеркало из https://github.com/mozilla/gecko-dev.git
545 строки
22 KiB
JavaScript
545 строки
22 KiB
JavaScript
/* -*- indent-tabs-mode: nil; js-indent-level: 4 -*-
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* vim: sw=4 ts=4 sts=4 et filetype=javascript
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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this.EXPORTED_SYMBOLS = [
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"NetUtil",
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];
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/**
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* Necko utilities
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*/
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////////////////////////////////////////////////////////////////////////////////
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//// Constants
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const Ci = Components.interfaces;
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const Cc = Components.classes;
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const Cr = Components.results;
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const Cu = Components.utils;
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const PR_UINT32_MAX = 0xffffffff;
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////////////////////////////////////////////////////////////////////////////////
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//// NetUtil Object
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this.NetUtil = {
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/**
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* Function to perform simple async copying from aSource (an input stream)
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* to aSink (an output stream). The copy will happen on some background
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* thread. Both streams will be closed when the copy completes.
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*
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* @param aSource
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* The input stream to read from
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* @param aSink
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* The output stream to write to
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* @param aCallback [optional]
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* A function that will be called at copy completion with a single
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* argument: the nsresult status code for the copy operation.
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*
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* @return An nsIRequest representing the copy operation (for example, this
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* can be used to cancel the copying). The consumer can ignore the
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* return value if desired.
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*/
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asyncCopy: function NetUtil_asyncCopy(aSource, aSink,
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aCallback = null)
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{
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if (!aSource || !aSink) {
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let exception = new Components.Exception(
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"Must have a source and a sink",
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Cr.NS_ERROR_INVALID_ARG,
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Components.stack.caller
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);
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throw exception;
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}
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// make a stream copier
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var copier = Cc["@mozilla.org/network/async-stream-copier;1"].
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createInstance(Ci.nsIAsyncStreamCopier2);
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copier.init(aSource, aSink,
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null /* Default event target */,
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0 /* Default length */,
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true, true /* Auto-close */);
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var observer;
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if (aCallback) {
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observer = {
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onStartRequest: function(aRequest, aContext) {},
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onStopRequest: function(aRequest, aContext, aStatusCode) {
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aCallback(aStatusCode);
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}
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}
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} else {
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observer = null;
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}
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// start the copying
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copier.QueryInterface(Ci.nsIAsyncStreamCopier).asyncCopy(observer, null);
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return copier;
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},
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/**
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* Asynchronously opens a source and fetches the response. A source can be
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* an nsIURI, nsIFile, string spec, nsIChannel, or nsIInputStream. The
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* provided callback will get an input stream containing the response, the
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* result code, and a reference to the request.
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*
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* @param aSource
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* The nsIURI, nsIFile, string spec, nsIChannel, or nsIInputStream
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* to open.
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* @param aCallback
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* The callback function that will be notified upon completion. It
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* will get two arguments:
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* 1) An nsIInputStream containing the data from aSource, if any.
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* 2) The status code from opening the source.
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* 3) Reference to the nsIRequest.
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*/
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asyncFetch: function NetUtil_asyncOpen(aSource, aCallback)
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{
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if (!aSource || !aCallback) {
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let exception = new Components.Exception(
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"Must have a source and a callback",
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Cr.NS_ERROR_INVALID_ARG,
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Components.stack.caller
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);
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throw exception;
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}
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// Create a pipe that will create our output stream that we can use once
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// we have gotten all the data.
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let pipe = Cc["@mozilla.org/pipe;1"].
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createInstance(Ci.nsIPipe);
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pipe.init(true, true, 0, PR_UINT32_MAX, null);
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// Create a listener that will give data to the pipe's output stream.
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let listener = Cc["@mozilla.org/network/simple-stream-listener;1"].
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createInstance(Ci.nsISimpleStreamListener);
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listener.init(pipe.outputStream, {
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onStartRequest: function(aRequest, aContext) {},
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onStopRequest: function(aRequest, aContext, aStatusCode) {
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pipe.outputStream.close();
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aCallback(pipe.inputStream, aStatusCode, aRequest);
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}
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});
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// Input streams are handled slightly differently from everything else.
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if (aSource instanceof Ci.nsIInputStream) {
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let pump = Cc["@mozilla.org/network/input-stream-pump;1"].
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createInstance(Ci.nsIInputStreamPump);
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pump.init(aSource, -1, -1, 0, 0, true);
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pump.asyncRead(listener, null);
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return;
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}
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let channel = aSource;
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if (!(channel instanceof Ci.nsIChannel)) {
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channel = this.newChannel(aSource);
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}
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try {
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channel.asyncOpen(listener, null);
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}
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catch (e) {
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let exception = new Components.Exception(
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"Failed to open input source '" + channel.originalURI.spec + "'",
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e.result,
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Components.stack.caller,
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aSource,
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e
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);
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throw exception;
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}
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},
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/**
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* Asynchronously opens a source and fetches the response. A source can be
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* an nsIURI, nsIFile, string spec, nsIChannel, or nsIInputStream. The
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* provided callback will get an input stream containing the response, the
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* result code, and a reference to the request.
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*
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* Please note, if aSource is an instance of an nsIChannel, then
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* aLoadingNode, aLoadingPrincipal, aTriggeringPrincipal, aSecurityFlags,
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* aContentPolicyType must be "undefined".
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*
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* @param aSource
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* The nsIURI, nsIFile, string spec, nsIChannel, or nsIInputStream
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* to open.
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* @param aCallback
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* The callback function that will be notified upon completion. It
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* will get two arguments:
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* 1) An nsIInputStream containing the data from aSource, if any.
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* 2) The status code from opening the source.
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* 3) Reference to the nsIRequest.
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* @param aLoadingNode, aLoadingPrincipal, aTriggeringPrincipal
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* aSecurityFlags, aContentPolicyType
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* See param description in NetUtil_newChannel2.
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*
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* Note: As an interim we have asyncFetch as well as asyncFetch2.
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* Once Bug 1087720 (which converts all js callers to use
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* asyncFetch2) lands, we can remove asyncFetch completely.
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*/
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asyncFetch2: function NetUtil_asyncFetch2(aSource,
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aCallback,
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aLoadingNode,
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aLoadingPrincipal,
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aTriggeringPrincipal,
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aSecurityFlags,
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aContentPolicyType)
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{
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if (!aSource || !aCallback) {
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let exception = new Components.Exception(
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"Must have a source and a callback",
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Cr.NS_ERROR_INVALID_ARG,
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Components.stack.caller
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);
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throw exception;
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}
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// if aSource is an instance of an nsIChannel, all the individual
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// args to create a loadInfo must be "undefined".
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if (aSource instanceof Ci.nsIChannel) {
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if ((typeof aLoadingNode != "undefined") ||
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(typeof aLoadingPrincipal != "undefined") ||
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(typeof aTriggeringPrincipal != "undefined") ||
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(typeof aSecurityFlags != "undefined") ||
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(typeof aContentPolicyType != "undefined")) {
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let exception = new Components.Exception(
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"LoadInfo arguments must be undefined",
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Cr.NS_ERROR_INVALID_ARG,
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Components.stack.caller
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);
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throw exception;
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}
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}
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// Create a pipe that will create our output stream that we can use once
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// we have gotten all the data.
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let pipe = Cc["@mozilla.org/pipe;1"].
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createInstance(Ci.nsIPipe);
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pipe.init(true, true, 0, PR_UINT32_MAX, null);
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// Create a listener that will give data to the pipe's output stream.
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let listener = Cc["@mozilla.org/network/simple-stream-listener;1"].
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createInstance(Ci.nsISimpleStreamListener);
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listener.init(pipe.outputStream, {
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onStartRequest: function(aRequest, aContext) {},
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onStopRequest: function(aRequest, aContext, aStatusCode) {
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pipe.outputStream.close();
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aCallback(pipe.inputStream, aStatusCode, aRequest);
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}
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});
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// Input streams are handled slightly differently from everything else.
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if (aSource instanceof Ci.nsIInputStream) {
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let pump = Cc["@mozilla.org/network/input-stream-pump;1"].
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createInstance(Ci.nsIInputStreamPump);
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pump.init(aSource, -1, -1, 0, 0, true);
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pump.asyncRead(listener, null);
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return;
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}
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let channel = aSource;
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if (!(channel instanceof Ci.nsIChannel)) {
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channel = this.newChannel2(aSource,
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"", // aOriginCharset
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null, // aBaseURI
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aLoadingNode,
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aLoadingPrincipal,
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aTriggeringPrincipal,
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aSecurityFlags,
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aContentPolicyType);
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}
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try {
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channel.asyncOpen(listener, null);
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}
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catch (e) {
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let exception = new Components.Exception(
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"Failed to open input source '" + channel.originalURI.spec + "'",
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e.result,
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Components.stack.caller,
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aSource,
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e
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);
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throw exception;
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}
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},
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/**
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* Constructs a new URI for the given spec, character set, and base URI, or
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* an nsIFile.
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*
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* @param aTarget
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* The string spec for the desired URI or an nsIFile.
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* @param aOriginCharset [optional]
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* The character set for the URI. Only used if aTarget is not an
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* nsIFile.
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* @param aBaseURI [optional]
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* The base URI for the spec. Only used if aTarget is not an
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* nsIFile.
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*
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* @return an nsIURI object.
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*/
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newURI: function NetUtil_newURI(aTarget, aOriginCharset, aBaseURI)
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{
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if (!aTarget) {
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let exception = new Components.Exception(
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"Must have a non-null string spec or nsIFile object",
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Cr.NS_ERROR_INVALID_ARG,
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Components.stack.caller
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);
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throw exception;
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}
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if (aTarget instanceof Ci.nsIFile) {
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return this.ioService.newFileURI(aTarget);
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}
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return this.ioService.newURI(aTarget, aOriginCharset, aBaseURI);
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},
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/**
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* Constructs a new channel for the given spec, character set, and base URI,
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* or nsIURI, or nsIFile.
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*
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* @param aWhatToLoad
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* The string spec for the desired URI, an nsIURI, or an nsIFile.
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* @param aOriginCharset [optional]
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* The character set for the URI. Only used if aWhatToLoad is a
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* string.
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* @param aBaseURI [optional]
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* The base URI for the spec. Only used if aWhatToLoad is a string.
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*
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* @return an nsIChannel object.
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*/
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newChannel: function NetUtil_newChannel(aWhatToLoad, aOriginCharset,
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aBaseURI)
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{
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if (!aWhatToLoad) {
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let exception = new Components.Exception(
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"Must have a non-null string spec, nsIURI, or nsIFile object",
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Cr.NS_ERROR_INVALID_ARG,
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Components.stack.caller
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);
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throw exception;
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}
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let uri = aWhatToLoad;
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if (!(aWhatToLoad instanceof Ci.nsIURI)) {
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// We either have a string or an nsIFile that we'll need a URI for.
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uri = this.newURI(aWhatToLoad, aOriginCharset, aBaseURI);
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}
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return this.ioService.newChannelFromURI(uri);
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},
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/**
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* Constructs a new channel for the given spec, character set, and base URI,
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* or nsIURI, or nsIFile.
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*
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* @param aWhatToLoad
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* The string spec for the desired URI, an nsIURI, or an nsIFile.
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* @param aOriginCharset
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* The character set for the URI. Only used if aWhatToLoad is a
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* string.
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* @param aBaseURI
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* The base URI for the spec. Only used if aWhatToLoad is a string.
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* @param aLoadingNode
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* The loadingDocument of the channel.
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* The element or document where the result of this request will be
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* used. This is the document/element that will get access to the
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* result of this request. For example for an image load, it's the
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* document in which the image will be loaded. And for a CSS
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* stylesheet it's the document whose rendering will be affected by
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* the stylesheet.
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* If possible, pass in the element which is performing the load. But
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* if the load is coming from a JS API (such as XMLHttpRequest) or if
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* the load might be coalesced across multiple elements (such as
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* for <img>) then pass in the Document node instead.
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* For loads that are not related to any document, such as loads coming
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* from addons or internal browser features, use null here.
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* @param aLoadingPrincipal
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* The loadingPrincipal of the channel.
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* The principal of the document where the result of this request will
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* be used.
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* This is generally the principal of the aLoadingNode. However for
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* loads where aLoadingNode is null this argument still needs to be
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* passed. For example for loads from a WebWorker, pass the principal
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* of that worker. For loads from an addon or from internal browser
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* features, pass the system principal.
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* This principal should almost always be the system principal if
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* aLoadingNode is null. The only exception to this is for loads
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* from WebWorkers since they don't have any nodes to be passed as
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* aLoadingNode.
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* Please note, aLoadingPrincipal is *not* the principal of the
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* resource being loaded. But rather the principal of the context
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* where the resource will be used.
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* @param aTriggeringPrincipal
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* The triggeringPrincipal of the load.
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* The triggeringPrincipal is the principal of the resource that caused
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* this particular URL to be loaded.
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* Most likely the triggeringPrincipal and the loadingPrincipal are
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* identical, in which case the triggeringPrincipal can be left out.
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* In some cases the loadingPrincipal and the triggeringPrincipal are
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* different however, e.g. a stylesheet may import a subresource. In
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* that case the principal of the stylesheet which contains the
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* import command is the triggeringPrincipal, and the principal of
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* the document whose rendering is affected is the loadingPrincipal.
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* @param aSecurityFlags
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* The securityFlags of the channel.
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* Any of the securityflags defined in nsILoadInfo.idl
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* @param aContentPolicyType
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* The contentPolicyType of the channel.
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* Any of the content types defined in nsIContentPolicy.idl
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* @return an nsIChannel object.
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*
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* Keep in mind that URIs coming from a webpage should *never* use the
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* systemPrincipal as the loadingPrincipal.
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*
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* Note: As an interim we have newChannel as well as newChannel2.
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* Once Bug 1087720 (which converts all js callers to use
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* newChannel2) lands, we can remove newChannel completely.
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*/
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newChannel2: function NetUtil_newChannel2(aWhatToLoad,
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aOriginCharset,
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aBaseURI,
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aLoadingNode,
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aLoadingPrincipal,
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aTriggeringPrincipal,
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aSecurityFlags,
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aContentPolicyType)
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{
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if (!aWhatToLoad) {
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let exception = new Components.Exception(
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"Must have a non-null string spec, nsIURI, or nsIFile object",
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Cr.NS_ERROR_INVALID_ARG,
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Components.stack.caller
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);
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throw exception;
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}
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let uri = aWhatToLoad;
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if (!(aWhatToLoad instanceof Ci.nsIURI)) {
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// We either have a string or an nsIFile that we'll need a URI for.
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uri = this.newURI(aWhatToLoad, aOriginCharset, aBaseURI);
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}
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return this.ioService.newChannelFromURI2(uri,
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aLoadingNode,
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aLoadingPrincipal,
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aTriggeringPrincipal,
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aSecurityFlags,
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aContentPolicyType);
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},
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/**
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* Reads aCount bytes from aInputStream into a string.
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*
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* @param aInputStream
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* The input stream to read from.
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* @param aCount
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* The number of bytes to read from the stream.
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* @param aOptions [optional]
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* charset
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* The character encoding of stream data.
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* replacement
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* The character to replace unknown byte sequences.
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* If unset, it causes an exceptions to be thrown.
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*
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* @return the bytes from the input stream in string form.
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*
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* @throws NS_ERROR_INVALID_ARG if aInputStream is not an nsIInputStream.
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* @throws NS_BASE_STREAM_WOULD_BLOCK if reading from aInputStream would
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* block the calling thread (non-blocking mode only).
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* @throws NS_ERROR_FAILURE if there are not enough bytes available to read
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* aCount amount of data.
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* @throws NS_ERROR_ILLEGAL_INPUT if aInputStream has invalid sequences
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*/
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readInputStreamToString: function NetUtil_readInputStreamToString(aInputStream,
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aCount,
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aOptions)
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{
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if (!(aInputStream instanceof Ci.nsIInputStream)) {
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let exception = new Components.Exception(
|
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"First argument should be an nsIInputStream",
|
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Cr.NS_ERROR_INVALID_ARG,
|
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Components.stack.caller
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);
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throw exception;
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}
|
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|
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if (!aCount) {
|
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let exception = new Components.Exception(
|
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"Non-zero amount of bytes must be specified",
|
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Cr.NS_ERROR_INVALID_ARG,
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Components.stack.caller
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);
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throw exception;
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}
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|
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if (aOptions && "charset" in aOptions) {
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let cis = Cc["@mozilla.org/intl/converter-input-stream;1"].
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createInstance(Ci.nsIConverterInputStream);
|
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try {
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// When replacement is set, the character that is unknown sequence
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// replaces with aOptions.replacement character.
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if (!("replacement" in aOptions)) {
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// aOptions.replacement isn't set.
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// If input stream has unknown sequences for aOptions.charset,
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// throw NS_ERROR_ILLEGAL_INPUT.
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aOptions.replacement = 0;
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}
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cis.init(aInputStream, aOptions.charset, aCount,
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aOptions.replacement);
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let str = {};
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cis.readString(-1, str);
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cis.close();
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return str.value;
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}
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catch (e) {
|
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// Adjust the stack so it throws at the caller's location.
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|
throw new Components.Exception(e.message, e.result,
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Components.stack.caller, e.data);
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}
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}
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|
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let sis = Cc["@mozilla.org/scriptableinputstream;1"].
|
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createInstance(Ci.nsIScriptableInputStream);
|
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sis.init(aInputStream);
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try {
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return sis.readBytes(aCount);
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|
}
|
|
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);
|
|
},
|
|
};
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
//// Initialization
|
|
|
|
Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
|
|
|
|
// Define our lazy getters.
|
|
XPCOMUtils.defineLazyServiceGetter(this, "ioUtil", "@mozilla.org/io-util;1",
|
|
"nsIIOUtil");
|