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268 lines
11 KiB
Plaintext
268 lines
11 KiB
Plaintext
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsIRequest.idl"
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interface nsIURI;
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interface nsIInterfaceRequestor;
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interface nsIInputStream;
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interface nsIStreamListener;
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/**
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* The nsIChannel interface allows clients to construct "GET" requests for
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* specific protocols, and manage them in a uniform way. Once a channel is
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* created (via nsIIOService::newChannel), parameters for that request may
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* be set by using the channel attributes, or by QI'ing to a subclass of
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* nsIChannel for protocol-specific parameters. Then, the URI can be fetched
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* by calling nsIChannel::open or nsIChannel::asyncOpen.
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*
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* After a request has been completed, the channel is still valid for accessing
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* protocol-specific results. For example, QI'ing to nsIHttpChannel allows
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* response headers to be retrieved for the corresponding http transaction.
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*
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* @status FROZEN
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*/
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[scriptable, uuid(c63a055a-a676-4e71-bf3c-6cfa11082018)]
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interface nsIChannel : nsIRequest
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{
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/**
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* The original URI used to construct the channel. This is used in
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* the case of a redirect or URI "resolution" (e.g. resolving a
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* resource: URI to a file: URI) so that the original pre-redirect
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* URI can still be obtained. This is never null. Attempts to
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* set it to null must throw.
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*
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* NOTE: this is distinctly different from the http Referer (referring URI),
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* which is typically the page that contained the original URI (accessible
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* from nsIHttpChannel).
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*/
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attribute nsIURI originalURI;
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/**
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* The URI corresponding to the channel. Its value is immutable.
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*/
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readonly attribute nsIURI URI;
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/**
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* The owner, corresponding to the entity that is responsible for this
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* channel. Used by the security manager to grant or deny privileges to
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* mobile code loaded from this channel.
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*
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* NOTE: this is a strong reference to the owner, so if the owner is also
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* holding a strong reference to the channel, care must be taken to
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* explicitly drop its reference to the channel.
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*/
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attribute nsISupports owner;
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/**
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* The notification callbacks for the channel. This is set by clients, who
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* wish to provide a means to receive progress, status and protocol-specific
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* notifications. If this value is NULL, the channel implementation may use
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* the notification callbacks from its load group. The channel may also
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* query the notification callbacks from its load group if its notification
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* callbacks do not supply the requested interface.
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*
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* Interfaces commonly requested include: nsIProgressEventSink, nsIPrompt,
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* and nsIAuthPrompt/nsIAuthPrompt2.
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*
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* When the channel is done, it must not continue holding references to
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* this object.
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*
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* NOTE: A channel implementation should take care when "caching" an
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* interface pointer queried from its notification callbacks. If the
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* notification callbacks are changed, then a cached interface pointer may
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* become invalid and may therefore need to be re-queried.
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*/
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attribute nsIInterfaceRequestor notificationCallbacks;
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/**
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* Transport-level security information (if any) corresponding to the channel.
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*/
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readonly attribute nsISupports securityInfo;
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/**
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* The MIME type of the channel's content if available.
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*
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* NOTE: the content type can often be wrongly specified (e.g., wrong file
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* extension, wrong MIME type, wrong document type stored on a server, etc.),
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* and the caller most likely wants to verify with the actual data.
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*
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* Setting contentType before the channel has been opened provides a hint
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* to the channel as to what the MIME type is. The channel may ignore this
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* hint in deciding on the actual MIME type that it will report.
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*
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* Setting contentType after onStartRequest has been fired or after open()
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* is called will override the type determined by the channel.
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*
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* Setting contentType between the time that asyncOpen() is called and the
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* time when onStartRequest is fired has undefined behavior at this time.
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*
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* The value of the contentType attribute is a lowercase string. A value
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* assigned to this attribute will be parsed and normalized as follows:
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* 1- any parameters (delimited with a ';') will be stripped.
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* 2- if a charset parameter is given, then its value will replace the
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* the contentCharset attribute of the channel.
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* 3- the stripped contentType will be lowercased.
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* Any implementation of nsIChannel must follow these rules.
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*/
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attribute ACString contentType;
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/**
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* The character set of the channel's content if available and if applicable.
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* This attribute only applies to textual data.
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*
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* The value of the contentCharset attribute is a mixedcase string.
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*/
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attribute ACString contentCharset;
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/**
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* The length of the data associated with the channel if available. A value
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* of -1 indicates that the content length is unknown.
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*
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* Callers should prefer getting the "content-length" property
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* as 64-bit value by QIing the channel to nsIPropertyBag2,
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* if that interface is exposed by the channel.
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*/
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attribute long contentLength;
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/**
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* Synchronously open the channel.
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*
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* @return blocking input stream to the channel's data.
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*
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* NOTE: nsIChannel implementations are not required to implement this
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* method. Moreover, since this method may block the calling thread, it
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* should not be called on a thread that processes UI events.
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*
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* NOTE: Implementations should throw NS_ERROR_IN_PROGRESS if the channel
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* is reopened.
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*/
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nsIInputStream open();
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/**
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* Asynchronously open this channel. Data is fed to the specified stream
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* listener as it becomes available. The stream listener's methods are
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* called on the thread that calls asyncOpen and are not called until
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* after asyncOpen returns. If asyncOpen returns successfully, the
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* channel promises to call at least onStartRequest and onStopRequest.
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*
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* If the nsIRequest object passed to the stream listener's methods is not
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* this channel, an appropriate onChannelRedirect notification needs to be
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* sent to the notification callbacks before onStartRequest is called.
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* Once onStartRequest is called, all following method calls on aListener
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* will get the request that was passed to onStartRequest.
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*
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* If the channel's and loadgroup's notification callbacks do not provide
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* an nsIChannelEventSink when onChannelRedirect would be called, that's
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* equivalent to having called onChannelRedirect.
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*
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* If asyncOpen returns successfully, the channel is responsible for
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* keeping itself alive until it has called onStopRequest on aListener or
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* called onChannelRedirect.
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*
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* Implementations are allowed to synchronously add themselves to the
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* associated load group (if any).
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*
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* NOTE: Implementations should throw NS_ERROR_ALREADY_OPENED if the
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* channel is reopened.
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*
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* @param aListener the nsIStreamListener implementation
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* @param aContext an opaque parameter forwarded to aListener's methods
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* @see nsIChannelEventSink for onChannelRedirect
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*/
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void asyncOpen(in nsIStreamListener aListener, in nsISupports aContext);
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/**************************************************************************
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* Channel specific load flags:
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*
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* Bits 22-31 are reserved for future use by this interface or one of its
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* derivatives (e.g., see nsICachingChannel).
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*/
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/**
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* Set (e.g., by the docshell) to indicate whether or not the channel
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* corresponds to a document URI.
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*/
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const unsigned long LOAD_DOCUMENT_URI = 1 << 16;
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/**
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* If the end consumer for this load has been retargeted after discovering
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* its content, this flag will be set:
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*/
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const unsigned long LOAD_RETARGETED_DOCUMENT_URI = 1 << 17;
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/**
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* This flag is set to indicate that this channel is replacing another
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* channel. This means that:
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*
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* 1) the stream listener this channel will be notifying was initially
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* passed to the asyncOpen method of some other channel
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*
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* and
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*
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* 2) this channel's URI is a better identifier of the resource being
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* accessed than this channel's originalURI.
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*
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* This flag can be set, for example, for redirects or for cases when a
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* single channel has multiple parts to it (and thus can follow
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* onStopRequest with another onStartRequest/onStopRequest pair, each pair
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* for a different request).
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*/
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const unsigned long LOAD_REPLACE = 1 << 18;
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/**
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* Set (e.g., by the docshell) to indicate whether or not the channel
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* corresponds to an initial document URI load (e.g., link click).
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*/
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const unsigned long LOAD_INITIAL_DOCUMENT_URI = 1 << 19;
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/**
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* Set (e.g., by the URILoader) to indicate whether or not the end consumer
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* for this load has been determined.
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*/
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const unsigned long LOAD_TARGETED = 1 << 20;
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/**
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* If this flag is set, the channel should call the content sniffers as
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* described in nsNetCID.h about NS_CONTENT_SNIFFER_CATEGORY.
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*
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* Note: Channels may ignore this flag; however, new channel implementations
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* should only do so with good reason.
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*/
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const unsigned long LOAD_CALL_CONTENT_SNIFFERS = 1 << 21;
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};
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