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Diffstat (limited to 'netwerk/base/NetUtil.jsm')
| -rw-r--r-- | netwerk/base/NetUtil.jsm | 453 |
1 files changed, 453 insertions, 0 deletions
diff --git a/netwerk/base/NetUtil.jsm b/netwerk/base/NetUtil.jsm new file mode 100644 index 0000000000..f901b9805b --- /dev/null +++ b/netwerk/base/NetUtil.jsm @@ -0,0 +1,453 @@ +/* -*- 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/. */ + +var EXPORTED_SYMBOLS = ["NetUtil"]; + +/** + * Necko utilities + */ + +// ////////////////////////////////////////////////////////////////////////////// +// // Constants + +const PR_UINT32_MAX = 0xffffffff; + +const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm"); + +const BinaryInputStream = Components.Constructor( + "@mozilla.org/binaryinputstream;1", + "nsIBinaryInputStream", + "setInputStream" +); + +// ////////////////////////////////////////////////////////////////////////////// +// // NetUtil Object + +var 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(aRequest) {}, + onStopRequest(aRequest, 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(aRequest) {}, + onStopRequest(aRequest, 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, 0, 0, true); + pump.asyncRead(listener, null); + return; + } + + let channel = aSource; + if (!(channel instanceof Ci.nsIChannel)) { + channel = this.newChannel(aSource); + } + + try { + channel.asyncOpen(listener); + } 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 Services.io.newFileURI(aTarget); + } + + return Services.io.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, nsIURI or nsIFile to create the + * channel for. + * Note that this cannot be an nsIFile if you have to specify a + * non-default charset or base URI. Call NetUtil.newURI first if + * you need to construct an URI using those options. + * loadingNode: + * loadingPrincipal: + * triggeringPrincipal: + * securityFlags: + * contentPolicyType: + * These will be used as values for the nsILoadInfo object on the + * created channel. For details, see nsILoadInfo in nsILoadInfo.idl + * 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. + * } + * @return an nsIChannel object. + */ + newChannel: function NetUtil_newChannel(aWhatToLoad) { + // Make sure the API is called using only the options object. + if (typeof aWhatToLoad != "object" || arguments.length != 1) { + 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 instanceof Ci.nsIFile) { + 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) { + if (!loadUsingSystemPrincipal) { + throw new Components.Exception( + "newChannel requires the 'securityFlags' property on" + + " the options object unless loading from system principal.", + Cr.NS_ERROR_INVALID_ARG, + Components.stack.caller + ); + } + securityFlags = Ci.nsILoadInfo.SEC_ALLOW_CROSS_ORIGIN_SEC_CONTEXT_IS_NULL; + } + + 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; + } + + let channel = Services.io.newChannelFromURI( + uri, + loadingNode || null, + loadingPrincipal || null, + triggeringPrincipal || null, + securityFlags, + contentPolicyType + ); + if (loadUsingSystemPrincipal) { + channel.loadInfo.allowDeprecatedSystemRequests = true; + } + return channel; + }, + + /** + * 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 + ); + } + }, + + /** + * Reads aCount bytes from aInputStream into a string. + * + * @param {nsIInputStream} aInputStream + * The input stream to read from. + * @param {integer} [aCount = aInputStream.available()] + * The number of bytes to read from the stream. + * + * @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. + */ + readInputStream(aInputStream, aCount) { + 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) { + aCount = aInputStream.available(); + } + + let stream = new BinaryInputStream(aInputStream); + let result = new ArrayBuffer(aCount); + stream.readArrayBuffer(result.byteLength, result); + return result; + }, +}; |