gecko/netwerk/base/public/nsIProtocolProxyService.idl

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/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim:set ts=4 sw=4 sts=4 et: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Darin Fisher <darin@meer.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsISupports.idl"
interface nsICancelable;
interface nsIProtocolProxyCallback;
interface nsIProtocolProxyFilter;
interface nsIProxyInfo;
interface nsIChannel;
interface nsIURI;
/**
* nsIProtocolProxyService provides methods to access information about
* various network proxies.
*
* @status UNDER_REVIEW
*/
[scriptable, uuid(e38ab577-786e-4a7f-936b-7ae4c7d877b2)]
interface nsIProtocolProxyService : nsISupports
{
/**
* This flag may be passed to the resolve method to request that it fail
* instead of block the calling thread. Proxy Auto Config (PAC) may
* perform a synchronous DNS query, which may not return immediately. So,
* calling resolve without this flag may result in locking up the calling
* thread for a lengthy period of time.
*
* By passing this flag to resolve, one can failover to asyncResolve to
* avoid locking up the calling thread if a PAC query is required.
*
* When this flag is passed to resolve, resolve may throw the exception
* NS_BASE_STREAM_WOULD_BLOCK to indicate that it failed due to this flag
* being present.
*/
const unsigned long RESOLVE_NON_BLOCKING = 1 << 0;
/**
* This method returns a nsIProxyInfo instance that identifies a proxy to
* be used for loading the given URI. Otherwise, this method returns null
* indicating that a direct connection should be used.
*
* @param aURI
* The URI to test.
* @param aFlags
* A bit-wise combination of the RESOLVE_ flags defined above. Pass
* 0 to specify the default behavior. Any additional bits that do
* not correspond to a RESOLVE_ flag are reserved for future use.
*
* NOTE: If this proxy is unavailable, getFailoverForProxy may be called
* to determine the correct secondary proxy to be used.
*
* NOTE: If the protocol handler for the given URI supports
* nsIProxiedProtocolHandler, then the nsIProxyInfo instance returned from
* resolve may be passed to the newProxiedChannel method to create a
* nsIChannel to the given URI that uses the specified proxy.
*
* NOTE: However, if the nsIProxyInfo type is "http", then it means that
* the given URI should be loaded using the HTTP protocol handler, which
* also supports nsIProxiedProtocolHandler.
*
* NOTE: If PAC is configured, and the PAC file has not yet been loaded,
* then this method will return a nsIProxyInfo instance with a type of
* "unknown" to indicate to the consumer that asyncResolve should be used
* to wait for the PAC file to finish loading. Otherwise, the consumer
* may choose to treat the result as type "direct" if desired.
*
* @see nsIProxiedProtocolHandler::newProxiedChannel
*/
nsIProxyInfo resolve(in nsIURI aURI, in unsigned long aFlags);
/**
* This method is an asychronous version of the resolve method. Unlike
* resolve, this method is guaranteed not to block the calling thread
* waiting for DNS queries to complete. This method is intended as a
* substitute for resolve when the result is not needed immediately.
*
* @param aURI
* The URI to test.
* @param aFlags
* A bit-wise combination of the RESOLVE_ flags defined above. Pass
* 0 to specify the default behavior. Any additional bits that do
* not correspond to a RESOLVE_ flag are reserved for future use.
* @param aCallback
* The object to be notified when the result is available.
*
* @return An object that can be used to cancel the asychronous operation.
* If canceled, the cancelation status (aReason) will be forwarded
* to the callback's onProxyAvailable method via the aStatus param.
*/
nsICancelable asyncResolve(in nsIURI aURI, in unsigned long aFlags,
in nsIProtocolProxyCallback aCallback);
/**
* This method may be called to construct a nsIProxyInfo instance from
* the given parameters. This method may be useful in conjunction with
* nsISocketTransportService::createTransport for creating, for example,
* a SOCKS connection.
*
* @param aType
* The proxy type. This is a string value that identifies the proxy
* type. Standard values include:
* "http" - specifies a HTTP proxy
* "socks" - specifies a SOCKS version 5 proxy
* "socks4" - specifies a SOCKS version 4 proxy
* "direct" - specifies a direct connection (useful for failover)
* The type name is case-insensitive. Other string values may be
* possible, and new types may be defined by a future version of
* this interface.
* @param aHost
* The proxy hostname or IP address.
* @param aPort
* The proxy port.
* @param aFlags
* Flags associated with this connection. See nsIProxyInfo.idl
* for currently defined flags.
* @param aFailoverTimeout
* Specifies the length of time (in seconds) to ignore this proxy if
* this proxy fails. Pass PR_UINT32_MAX to specify the default
* timeout value, causing nsIProxyInfo::failoverTimeout to be
* assigned the default value.
* @param aFailoverProxy
* Specifies the next proxy to try if this proxy fails. This
* parameter may be null.
*/
nsIProxyInfo newProxyInfo(in ACString aType, in AUTF8String aHost,
in long aPort, in unsigned long aFlags,
in unsigned long aFailoverTimeout,
in nsIProxyInfo aFailoverProxy);
/**
* If the proxy identified by aProxyInfo is unavailable for some reason,
* this method may be called to access an alternate proxy that may be used
* instead. As a side-effect, this method may affect future result values
* from resolve/asyncResolve as well as from getFailoverForProxy.
*
* @param aProxyInfo
* The proxy that was unavailable.
* @param aURI
* The URI that was originally passed to resolve/asyncResolve.
* @param aReason
* The error code corresponding to the proxy failure. This value
* may be used to tune the delay before this proxy is used again.
*
* @throw NS_ERROR_NOT_AVAILABLE if there is no alternate proxy available.
*/
nsIProxyInfo getFailoverForProxy(in nsIProxyInfo aProxyInfo,
in nsIURI aURI,
in nsresult aReason);
/**
* This method may be used to register a proxy filter instance. Each proxy
* filter is registered with an associated position that determines the
* order in which the filters are applied (starting from position 0). When
* resolve/asyncResolve is called, it generates a list of proxies for the
* given URI, and then it applies the proxy filters. The filters have the
* opportunity to modify the list of proxies.
*
* If two filters register for the same position, then the filters will be
* visited in the order in which they were registered.
*
* If the filter is already registered, then its position will be updated.
*
* After filters have been run, any disabled or disallowed proxies will be
* removed from the list. A proxy is disabled if it had previously failed-
* over to another proxy (see getFailoverForProxy). A proxy is disallowed,
* for example, if it is a HTTP proxy and the nsIProtocolHandler for the
* queried URI does not permit proxying via HTTP.
*
* If a nsIProtocolHandler disallows all proxying, then filters will never
* have a chance to intercept proxy requests for such URLs.
*
* @param aFilter
* The nsIProtocolProxyFilter instance to be registered.
* @param aPosition
* The position of the filter.
*
* NOTE: It is possible to construct filters that compete with one another
* in undesirable ways. This API does not attempt to protect against such
* problems. It is recommended that any extensions that choose to call
* this method make their position value configurable at runtime (perhaps
* via the preferences service).
*/
void registerFilter(in nsIProtocolProxyFilter aFilter,
in unsigned long aPosition);
/**
* This method may be used to unregister a proxy filter instance. All
* filters will be automatically unregistered at XPCOM shutdown.
*
* @param aFilter
* The nsIProtocolProxyFilter instance to be unregistered.
*/
void unregisterFilter(in nsIProtocolProxyFilter aFilter);
};