242 lines
12 KiB
C
242 lines
12 KiB
C
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/*
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Copyright (c) 2006-2009 by Jakob Schroeter <js@camaya.net>
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This file is part of the gloox library. http://camaya.net/gloox
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This software is distributed under a license. The full license
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agreement can be found in the file LICENSE in this distribution.
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This software may not be copied, modified, sold or distributed
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other than expressed in the named license agreement.
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This software is distributed without any warranty.
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*/
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#ifndef STANZAEXTENSION_H__
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#define STANZAEXTENSION_H__
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#include "macros.h"
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#include <string>
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namespace gloox
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{
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class Tag;
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/**
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* Supported Stanza extension types.
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*/
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enum StanzaExtensionType
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{
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ExtNone, /**< Invalid StanzaExtension. */
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ExtVCardUpdate, /**< Extension in the vcard-temp:x:update namespace,
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* advertising a user avatar's SHA1 hash (XEP-0153). */
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ExtOOB, /**< An extension in the jabber:iq:oob or jabber:x:oob
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* namespaces (XEP-0066). */
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ExtGPGSigned, /**< An extension containing a GPG/PGP signature
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* (XEP-0027). */
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ExtGPGEncrypted, /**< An extension containing a GPG/PGP encrypted message
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* (XEP-0027). */
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ExtReceipt, /**< An extension containing a Message Receipt/Request
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* (XEP-0184). */
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ExtDelay, /**< An extension containing notice of delayed delivery
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* (XEP-0203 & XEP-0091). */
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ExtAMP, /**< An extension containing advanced message processing
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* rules (XEP-0079). */
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ExtError, /**< An extension containing an error. */
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ExtCaps, /**< An extension containing Entity Capabilities
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* (XEP-0115). */
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ExtChatState, /**< An extension containing a chat state (XEP-0085). */
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ExtMessageEvent, /**< An extension containing a message event (XEP-0022). */
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ExtDataForm, /**< An extension containing a Data Form (XEP-0004). */
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ExtNickname, /**< An extension containing a User Nickname (XEP-0172). */
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ExtResourceBind, /**< A resource bind SE (RFC3921). */
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ExtSessionCreation, /**< A session establishing SE (RFC3921). */
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ExtVersion, /**< An extension containing a Version request/reply
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* (XEP-0092). */
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ExtXHtmlIM, /**< An extension containing an XHTML message
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* representation (XEP-0071) */
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ExtDiscoInfo, /**< An extension containing a disco#info element (XEP-0030). */
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ExtDiscoItems, /**< An extension containing a disco#items element (XEP-0030). */
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ExtAdhocCommand, /**< An extension containing a Adhoc Command (XEP-0050). */
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ExtPrivateXML, /**< An extension used for Private XML Storage (XEP-0048). */
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ExtRoster, /**< An extension dealing with the user's roster (RFC-3921). */
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ExtFeatureNeg, /**< An extension abstracting a Feature Negotiation element
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* (XEP-0020). */
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ExtIBB, /**< An extension dealing with IBBs (XEP-0047). */
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ExtNonSaslAuth, /**< An extension for doing Non-SASL Authentication (XEP-0078). */
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ExtMUC, /**< An extension dealing with the muc namespace of XEP-0045. */
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ExtMUCOwner, /**< An extension dealing with the muc#owner namespace of XEP-0045. */
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ExtMUCAdmin, /**< An extension dealing with the muc#admin namespace of XEP-0045. */
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ExtMUCUser, /**< An extension dealing with the muc#user namespace of XEP-0045. */
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ExtMUCUnique, /**< An extension dealing with the muc#unique namespace of XEP-0045. */
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ExtPing, /**< An XMPP Ping (XEP-0199). */
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ExtSearch, /**< A XEP-0055 (Jabber Search) wrapper. */
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ExtRegistration, /**< A XEP-0077 (In-Band Registration) wrapper. */
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ExtJingle, /**< An extension dealing with Jingle (XEP-0166) */
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ExtVCard, /**< An extension dealing with vcard-temp (XEP-0054) */
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ExtPrivacy, /**< An extension dealing with Privacy Lists (XEP-0016) */
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ExtLastActivity, /**< An extension dealing with Last Activity (XEP-0012). */
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ExtFlexOffline, /**< An extension dealing with Flexible Offline Messages (XEP-0013). */
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ExtSI, /**< An extension dealing with Stream Initiation (XEP-0095). */
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ExtS5BQuery, /**< An extension dealing with stream host offers (XEP-0065) */
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ExtPubSub, /**< An extension dealing with PubSub requests (XEP-0060). */
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ExtPubSubOwner, /**< An extension dealing with PubSub owner requests (XEP-0060). */
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ExtPubSubEvent, /**< An extension for PubSub event notifications
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* (XEP-0060) */
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ExtSHIM, /**< An extension dealing with Stanza Headers and Internet Metadata (XEP-0131). */
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ExtAttention, /**< An extension dealing with Attention (XEP-0224). */
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ExtUser /**< User-supplied extensions must use IDs above this. Do
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* not hard-code ExtUser's value anywhere, it is subject
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* to change. */
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};
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/**
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* @brief This class abstracts a stanza extension, which is usually
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* an element in a specific namespace.
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*
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* This class is the base class for almost all protocol extensions in gloox.
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* As such, it should be used whenever an add-on to the core XMPP spec
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* needs to be made. For simple protocols it may suffice to create a sub-class
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* of StanzaExtension. For protocols which require keeping of state, an additional
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* persistent object acting like a manager may be needed.
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*
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* A Stanza can be extended by additional namespaced child elements. Obviously,
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* it is not viable to include all the kinds of extensions possible. To avoid
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* hard-coding of such extensions into gloox, StanzaExtension can be used to
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* inform the core of gloox about additional supported extensions without it
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* needing to know about the exact implementation.
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*
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* Note that a StanzaExtension can be used for both sending and receiving
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* of custom protocols. When receiving, gloox requires an appropriate implementation
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* of the pure virtuals filterString() and newInstance(). To be able to properly use
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* the encapsulation, some getters may be necessary. Note that the object you will be
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* dealing with usually is @em const.
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* For sending StanzaExtensions, a custom constructor (as well as some setters,
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* possibly) is needed. Additionally, an implementation of tag() is required.
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*
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* @li Sub-class StanzaExtension and re-implement filterString(). filterString()
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* is supposed to return an XPath expression that matches the child element
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* of a stanza that the protocol-to-implement uses. For example, consider this
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* hypothetical XML format: The protocol is encapsulated inside a <stats>
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* element in the 'ext:stats' namespace. It uses IQ stanzas for transmission.
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* @code
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* <iq from='...' to='...' id='id1' type='get'>
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* <stats xmlns='ext:stats'/>
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* </iq>
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*
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* <iq from='...' to='...' id='id1' type='result'>
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* <stats xmlns='ext:stats'>
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* <users>10</users>
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* </stats>
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* </iq>
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* @endcode
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* The idea of filterString() and its XPath expression is to match the
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* <stats> element such that it can be fed to your
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* StanzaExtension-derived class' constructor when creating a new instance
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* of it. For our @e stats protocol, filterString() would return something like:
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* <em>/iq/stats[\@xmlns='ext:stats']</em>
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*
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* @li When subclassing StanzaExtension, you have to initialize it with an int, the extension's
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* type. You should choose a value that is not yet used in gloox, and unique to
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* the given extension you implement. In general, you are free to use values
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* above @link gloox::ExtUser ExtUser @endlink. See
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* @link gloox::StanzaExtensionType StanzaExtensionType @endlink for existing values.
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*
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* @li The next step is to implement newInstance(). Whenever filterString()'s
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* XPath expression matches a child element of an incoming stanza, newInstance()
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* is called with the matched Tag. For our example above, this is the <stats>
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* element (including its children):
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* @code
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* <stats xmlns='ext:stats'>
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* <users>10</users>
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* </stats>
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* @endcode
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* The purpose of newInstance() is to return a new instance of your specialized
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* StanzaExtension (implicitly cast to StanzaExtension). This way, gloox can deal
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* entirely with the abstract base, StanzaExtension, and never ever needs to know
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* which kind of extension it deals with. The most common implementation of
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* newInstance() looks like this:
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* @code
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* StanzaExtension* StatsExtension::newInstance( const Tag* tag ) const
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* {
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* return new StatsExtension( tag );
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* }
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* @endcode
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* This of course implies that a constructor exists that takes a <em>const Tag*</em> as the
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* only parameter.
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*
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* @li Finally, gloox must be able to serialize the StanzaExtension back
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* into string'ified XML. This is done by means of the tag() function which
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* must be reimplemented. The output Tag should -- like the input Tag -- be embeddable
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* into the respective stanza.
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*
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* @author Jakob Schroeter <js@camaya.net>
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* @since 0.9
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*/
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class GLOOX_API StanzaExtension
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{
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public:
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/**
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* Constructs an empty StanzaExtension.
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* @param type Designates the extension's type. It should be one of StanzaExtensionType
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* for built-in extensions, and it should be higher than ExtUser for custom types.
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*/
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StanzaExtension( int type ) : m_valid( false ), m_extensionType( type ) {}
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/**
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* Virtual destructor.
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*/
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virtual ~StanzaExtension() {}
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/**
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* Returns an XPath expression that describes a path to child elements of a
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* stanza that an extension handles.
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*
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* @return The extension's filter string.
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*/
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virtual const std::string& filterString() const = 0;
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/**
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* Returns a new Instance of the derived type. Usually, for a derived class FooExtension,
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* the implementation of this function looks like:
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* @code
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* StanzaExtension* FooExtension::newInstance( const Tag* tag ) const
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* {
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* return new FooExtension( tag );
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* }
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* @endcode
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* @return The derived extension's new instance.
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*/
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virtual StanzaExtension* newInstance( const Tag* tag ) const = 0;
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/**
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* Returns a Tag representation of the extension.
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* @return A Tag representation of the extension.
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*/
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virtual Tag* tag() const = 0;
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/**
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* Returns an identical copy of the current StanzaExtension.
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* @return An identical copy of the current StanzaExtension.
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*/
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virtual StanzaExtension* clone() const = 0;
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/**
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* Returns the extension's type.
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* @return The extension's type.
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*/
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int extensionType() const { return m_extensionType; }
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protected:
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bool m_valid;
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private:
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int m_extensionType;
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};
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}
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#endif // STANZAEXTENSION_H__
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