path: root/spec/Connection.xml

<?xml version="1.0" ?>
<node name="/Connection"
  xmlns:tp="http://telepathy.freedesktop.org/wiki/DbusSpec#extensions-v0"
  >
  <tp:copyright>Copyright (C) 2005-2009 Collabora Limited</tp:copyright>
  <tp:copyright>Copyright (C) 2005-2009 Nokia Corporation</tp:copyright>
  <tp:copyright>Copyright (C) 2006 INdT</tp:copyright>
  <tp:license xmlns="http://www.w3.org/1999/xhtml">
<p>This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.</p>

<p>This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.</p>

<p>You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
USA.</p>
  </tp:license>
  <interface name="org.freedesktop.Telepathy.Connection">
    <tp:requires interface="org.freedesktop.Telepathy.Connection.Interface.Requests"/>
    <tp:requires interface="org.freedesktop.Telepathy.Connection.Interface.Contacts"/>

    <tp:struct name="Channel_Info" array-name="Channel_Info_List">
      <tp:deprecated version="0.17.23"/>
      <tp:docstring>A struct representing a channel, as returned by
        ListChannels on the Connection interface.</tp:docstring>
      <tp:member type="o" name="Channel">
        <tp:docstring>The object path of the channel, which is on the
          same bus name as the connection</tp:docstring>
      </tp:member>
      <tp:member type="s" tp:type="DBus_Interface" name="Channel_Type">
        <tp:docstring>The channel's type</tp:docstring>
      </tp:member>
      <tp:member type="u" tp:type="Handle_Type" name="Handle_Type">
        <tp:docstring>The type of the handle that the channel communicates
          with, or Handle_Type_None if there is no associated
          handle</tp:docstring>
      </tp:member>
      <tp:member type="u" tp:type="Handle" name="Handle">
        <tp:docstring>The handle that the channel communicates with,
          or 0 if there is no associated handle</tp:docstring>
      </tp:member>
    </tp:struct>

    <method name="Connect" tp:name-for-bindings="Connect">
      <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
        <p>Request that the connection be established. This will be done
          asynchronously and errors will be returned by emitting
          <tp:member-ref>StatusChanged</tp:member-ref> signals.</p>

        <p>Calling this method on a Connection that is already connecting
          or connected is allowed, and has no effect.</p>
      </tp:docstring>
    </method>

    <method name="Disconnect" tp:name-for-bindings="Disconnect">
      <tp:docstring>
        Request that the connection be closed. This closes the connection if
        it's not already in DISCONNECTED state, and destroys the connection
        object.
      </tp:docstring>
    </method>

    <method name="GetInterfaces" tp:name-for-bindings="Get_Interfaces">
      <arg direction="out" type="as" tp:type="DBus_Interface[]"
        name="Interfaces">
        <tp:docstring>
          An array of D-Bus interface names
        </tp:docstring>
      </arg>

      <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
        <p>Get the optional interfaces supported by this connection.
          Before the connection status changes to CONNECTED, the return
          from this method may change at any time, but it is guaranteed that
          interfaces will only be added, not removed. After the connection
          status changes to CONNECTED, the return from this method cannot
          change further.</p>

        <p>There is no explicit change notification; reasonable behaviour
          for a client would be to retrieve the interfaces list once
          initially, and once more when it becomes CONNECTED.</p>

        <tp:rationale>
          <p>In some connection managers, certain capabilities of a connection
            are known to be implemented for all connections (e.g. support
            for SimplePresence), and some interfaces (like SimplePresence) can
            even be used before connecting. Other capabilities may
            or may not exist, depending on server functionality; by the time
            the connection goes CONNECTED, the connection manager is expected
            to have evaluated the server's functionality and enabled any extra
            interfaces for the remainder of the Connection's lifetime.</p>
        </tp:rationale>
      </tp:docstring>

      <tp:possible-errors>
        <tp:error name="org.freedesktop.Telepathy.Error.Disconnected">
          <tp:docstring>
             Before version 0.17.8 calling GetInterfaces while
             on a connection that is not yet CONNECTED wasn't allowed. If a
             CM returns this error, its list of interfaces should be regarded
             as empty until it becomes CONNECTED.
          </tp:docstring>
        </tp:error>
      </tp:possible-errors>
    </method>

    <method name="GetProtocol" tp:name-for-bindings="Get_Protocol">
      <arg direction="out" type="s" tp:type="Protocol" name="Protocol">
        <tp:docstring>
          A string identifier for the protocol
        </tp:docstring>
      </arg>

      <tp:docstring>
        Get the protocol this connection is using.
      </tp:docstring>
    </method>

    <signal name="SelfHandleChanged"
        tp:name-for-bindings="Self_Handle_Changed">
      <tp:docstring>
        Emitted whenever the <tp:member-ref>SelfHandle</tp:member-ref> property
        changes. If the connection
        is not yet in the CONNECTED state, this signal is not guaranteed
        to be emitted.
      </tp:docstring>
      <tp:added version="0.17.10">Clients MAY assume that if the
        SelfHandle property exists, this signal will be emitted when
        necessary.</tp:added>

      <arg type="u" tp:type="Contact_Handle" name="Self_Handle">
        <tp:docstring>
          The new value of the SelfHandle property.
        </tp:docstring>
      </arg>
    </signal>

    <property name="SelfHandle" tp:name-for-bindings="Self_Handle"
      type="u" tp:type="Contact_Handle" access="read">
      <tp:docstring>
        The handle which represents the user on this connection, which will
        remain valid for the lifetime of this connection, or until a change
        in the user's identifier is signalled by the
        <tp:member-ref>SelfHandleChanged</tp:member-ref> signal.
        If the connection is not yet in the CONNECTED state, the value of
        this property MAY be zero.
      </tp:docstring>
      <tp:added version="0.17.10">For compatibility with older
        versions, clients should fall back to calling the
        <tp:member-ref>GetSelfHandle</tp:member-ref>
        method.</tp:added>
    </property>

    <method name="GetSelfHandle" tp:name-for-bindings="Get_Self_Handle">
      <arg direction="out" type="u" tp:type="Contact_Handle"
        name="Self_Handle">
        <tp:docstring>
          The value of the <tp:member-ref>SelfHandle</tp:member-ref> property
        </tp:docstring>
      </arg>

      <tp:docstring>
        Returns the value of the SelfHandle property. Change notification
        is via the SelfHandleChanged signal.
      </tp:docstring>
      <tp:deprecated version="0.17.10">Use GetAll to get the
        SelfHandle property (and all other Connection properties)
        instead.</tp:deprecated>

      <tp:possible-errors>
        <tp:error name="org.freedesktop.Telepathy.Error.Disconnected"/>
      </tp:possible-errors>
    </method>

    <method name="GetStatus" tp:name-for-bindings="Get_Status">
      <arg direction="out" type="u" tp:type="Connection_Status"
        name="Status">
        <tp:docstring>
          An integer representing the current status
        </tp:docstring>
      </arg>

      <tp:docstring>
        Get the current status as defined in the
        <tp:member-ref>StatusChanged</tp:member-ref> signal.
      </tp:docstring>
    </method>

    <method name="HoldHandles" tp:name-for-bindings="Hold_Handles">
      <arg direction="in" name="Handle_Type" type="u" tp:type="Handle_Type">
        <tp:docstring>
          The type of handle to be held
        </tp:docstring>
      </arg>

      <arg direction="in" name="Handles" type="au" tp:type="Handle[]">
        <tp:docstring>
          A array of integer handles to hold
        </tp:docstring>
      </arg>

      <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
        <p>Notify the connection manger that your client is holding a copy
        of handles which may not be in use in any existing channel or
        list, and were not obtained by using the
        <tp:member-ref>RequestHandles</tp:member-ref> method. For
        example, a handle observed in an emitted signal, or displayed
        somewhere in the UI that is not associated with a channel. The
        connection manager must not deallocate a handle where any clients
        have used this method to indicate it is in use until the
        <tp:member-ref>ReleaseHandles</tp:member-ref>
        method is called, or the clients disappear from the bus.</p>

        <p>Note that HoldHandles is idempotent - calling it multiple times
          is equivalent to calling it once. If a handle is "referenced" by
          several components which share a D-Bus unique name, the client
          should perform reference counting internally, and only call
          ReleaseHandles when none of the cooperating components need the
          handle any longer.</p>
      </tp:docstring>

      <tp:possible-errors>
        <tp:error name="org.freedesktop.Telepathy.Error.Disconnected"/>
        <tp:error name="org.freedesktop.Telepathy.Error.InvalidArgument">
          <tp:docstring>
            The handle type is invalid
          </tp:docstring>
        </tp:error>
        <tp:error name="org.freedesktop.Telepathy.Error.InvalidHandle">
          <tp:docstring>
            One of the given handles is not valid
          </tp:docstring>
        </tp:error>
      </tp:possible-errors>
    </method>

    <method name="InspectHandles" tp:name-for-bindings="Inspect_Handles">
      <arg direction="in" name="Handle_Type" type="u" tp:type="Handle_Type">
        <tp:docstring>
          The type of handle to be inspected
        </tp:docstring>
      </arg>

      <arg direction="in" name="Handles" type="au" tp:type="Handle[]">
        <tp:docstring>
          An array of integer handles of this type
        </tp:docstring>
      </arg>

      <arg direction="out" type="as" name="Identifiers">
        <tp:docstring>
          An array of identifiers corresponding to the given handles, in the same order.
        </tp:docstring>
      </arg>

      <tp:docstring>
        Return a string representation for a number of handles of a given
        type.
      </tp:docstring>

      <tp:possible-errors>
        <tp:error name="org.freedesktop.Telepathy.Error.Disconnected"/>
        <tp:error name="org.freedesktop.Telepathy.Error.InvalidArgument">
          <tp:docstring>
            The handle type is invalid
          </tp:docstring>
        </tp:error>
        <tp:error name="org.freedesktop.Telepathy.Error.InvalidHandle">
          <tp:docstring>
            One of the given handles is not valid
          </tp:docstring>
        </tp:error>
      </tp:possible-errors>
    </method>

    <method name="ListChannels" tp:name-for-bindings="List_Channels">
      <tp:deprecated version="0.17.23">Use the
        <tp:dbus-ref
          namespace="org.freedesktop.Telepathy.Connection.Interface">Requests.Channels</tp:dbus-ref>
        property instead.
      </tp:deprecated>

      <arg direction="out" type="a(osuu)" tp:type="Channel_Info[]"
        name="Channel_Info">
        <tp:docstring>
          An array of structs representing channels.
        </tp:docstring>
      </arg>

      <tp:docstring>
        List all the channels which currently exist on this connection.
      </tp:docstring>

      <tp:possible-errors>
        <tp:error name="org.freedesktop.Telepathy.Error.Disconnected"/>
      </tp:possible-errors>
    </method>

    <signal name="NewChannel" tp:name-for-bindings="New_Channel">
      <tp:deprecated version="0.17.23">Connection managers MUST still
        emit this signal, but clients SHOULD listen for the <tp:dbus-ref
          namespace="org.freedesktop.Telepathy.Connection.Interface">Requests.NewChannels</tp:dbus-ref>
        signal instead.
      </tp:deprecated>

      <arg name="Object_Path" type="o">
        <tp:docstring>
          A D-Bus object path for the channel object on this service
        </tp:docstring>
      </arg>

      <arg name="Channel_Type" type="s" tp:type="DBus_Interface">
        <tp:docstring>
          A D-Bus interface name representing the channel type
        </tp:docstring>
      </arg>

      <arg name="Handle_Type" type="u" tp:type="Handle_Type">
        <tp:docstring>
          An integer representing the type of handle this channel
          communicates with, or Handle_Type_None if no handle is specified
        </tp:docstring>
      </arg>

      <arg name="Handle" type="u" tp:type="Handle">
        <tp:docstring>
          A handle indicating the specific contact, room or list this
          channel communicates with, or zero if no handle is specified
        </tp:docstring>
      </arg>

      <arg name="Suppress_Handler" type="b">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
          <p>If true, the channel was requested by a client that intends to
            present it to the user itself (i.e. it passed suppress_handler=TRUE
            to the <tp:member-ref>RequestChannel</tp:member-ref> method), so no
            other handler should be
            launched. Clients MAY assume that channels where this is true
            were created by a user request.</p>

          <p>If false, either the channel was created due to incoming
            information from the service, or the channel was requested by
            a local client that does not intend to handle the channel itself
            (this usage is deprecated).</p>

          <p>Clients MUST NOT assume that only incoming channels will have
            this flag set to false.</p>
        </tp:docstring>
      </arg>

      <tp:docstring>
        Emitted when a new Channel object is created, either through user
        request or incoming information from the service.
      </tp:docstring>
    </signal>

    <method name="ReleaseHandles" tp:name-for-bindings="Release_Handles">
      <arg direction="in" name="Handle_Type" type="u" tp:type="Handle_Type">
        <tp:docstring>
          An integer handle type (as defined in RequestHandle)
        </tp:docstring>
      </arg>

      <arg direction="in" name="Handles" type="au" tp:type="Handle[]">
        <tp:docstring>
          An array of integer handles being held by the client
        </tp:docstring>
      </arg>

      <tp:docstring>
        Explicitly notify the connection manager that your client is no
        longer holding any references to the given handles, and that they
        may be deallocated if they are not held by any other clients or
        referenced by any existing channels. See HoldHandles for notes.
      </tp:docstring>

      <tp:possible-errors>
        <tp:error name="org.freedesktop.Telepathy.Error.Disconnected"/>
        <tp:error name="org.freedesktop.Telepathy.Error.InvalidArgument">
          <tp:docstring>
            The handle type is invalid
          </tp:docstring>
        </tp:error>
        <tp:error name="org.freedesktop.Telepathy.Error.InvalidHandle">
          <tp:docstring>
            One of the given handles is not valid
          </tp:docstring>
        </tp:error>
        <tp:error name="org.freedesktop.Telepathy.Error.NotAvailable">
          <tp:docstring>
            One of the given handles is not held by this client
          </tp:docstring>
        </tp:error>
      </tp:possible-errors>
    </method>

    <method name="RequestChannel" tp:name-for-bindings="Request_Channel">
      <tp:deprecated version="0.17.23">Use
        <tp:dbus-ref
          namespace="org.freedesktop.Telepathy.Connection.Interface">Requests.CreateChannel</tp:dbus-ref>
        or <tp:dbus-ref
          namespace="org.freedesktop.Telepathy.Connection.Interface">Requests.EnsureChannel</tp:dbus-ref>
        instead. Connection managers MAY implement RequestChannel by
        raising NotImplemented, or implement fewer types of channel via
        this API.</tp:deprecated>

      <arg direction="in" name="Type" type="s" tp:type="DBus_Interface">
        <tp:docstring>
          A D-Bus interface name representing base channel type
        </tp:docstring>
      </arg>

      <arg direction="in" name="Handle_Type" type="u" tp:type="Handle_Type">
        <tp:docstring>
          An integer representing the handle type, or Handle_Type_None if
          no handle is specified
        </tp:docstring>
      </arg>

      <arg direction="in" name="Handle" type="u" tp:type="Handle">
        <tp:docstring>
          A nonzero integer handle representing a contact, room, list etc.
          according to handle_type, or zero if the handle_type is
          Handle_Type_None
        </tp:docstring>
      </arg>

      <arg direction="in" name="Suppress_Handler" type="b">
        <tp:docstring>
          <p>Clients SHOULD always set this to true.</p>

          <tp:rationale>
            <p>The historical meaning was that clients that did not
              intend to take responsibility for displaying the channel to
              the user could set this to FALSE, in which case the channel
              dispatcher would launch an appropriate channel handler.</p>

            <p>However, clients whose functionality relies on having a
              working channel dispatcher should obtain that functionality by
              calling methods on the channel dispatcher, so that they will
              get an appropriate error if the channel dispatcher is missing
              or not working.</p>

            <p>The channel dispatcher itself should set this to true too,
              so that it will ignore the
              <tp:member-ref>NewChannel</tp:member-ref> signal that results
              from the creation of the channel. It can then dispatch the
              channel returned from this method to an
              appropriate handler.</p>

            <p>So, there is no sensible use-case for setting this to false,
              and setting it to false can result in unhandled channels (in
              the case where clients assume that a channel dispatcher is
              present, but it isn't).</p>
          </tp:rationale>
        </tp:docstring>
      </arg>

      <arg direction="out" type="o" name="Object_Path">
        <tp:docstring>
          The D-Bus object path for the channel created or retrieved
        </tp:docstring>
      </arg>

      <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
        <p>Request a channel satisfying the specified type and communicating
          with the contact, room, list etc. indicated by the given
          handle_type and handle. The handle_type and handle may both be
          zero to request the creation of a new, empty channel, which may
          or may not be possible, depending on the protocol and channel
          type.</p>

        <p>On success, the returned channel will always be of the requested
          type (i.e. implement the requested channel-type interface).</p>

        <p>If a new, empty channel is requested, on success the returned
          channel will always be an "anonymous" channel for which the type
          and handle are both zero.</p>

        <p>If a channel to a contact, room etc. is requested, on success, the
          returned channel may either be a new or existing channel to
          the requested entity (i.e. its
          <tp:dbus-ref
            namespace="org.freedesktop.Telepathy.Channel">TargetHandleType</tp:dbus-ref>
          and <tp:dbus-ref
            namespace="org.freedesktop.Telepathy.Channel">TargetHandle</tp:dbus-ref>
          properties are the
          requested handle type and handle), or a newly created "anonymous"
          channel associated with the requested handle in some
          implementation-specific way.</p>

        <p>For example, for a contact handle, the returned channel
          might be "anonymous", but implement the groups interface and have
          the requested contact already present among the members.</p>

        <p>If the request cannot be satisfied, an error is raised and no
          channel is created.</p>
      </tp:docstring>

      <tp:possible-errors>
        <tp:error name="org.freedesktop.Telepathy.Error.Disconnected"/>
        <tp:error name="org.freedesktop.Telepathy.Error.NetworkError"/>
        <tp:error name="org.freedesktop.Telepathy.Error.NotImplemented">
          <tp:docstring>
            Unknown channel type
          </tp:docstring>
        </tp:error>
        <tp:error name="org.freedesktop.Telepathy.Error.InvalidHandle">
          <tp:docstring>
            The given handle does not exist or cannot be created
          </tp:docstring>
        </tp:error>
        <tp:error name="org.freedesktop.Telepathy.Error.NotAvailable">
          <tp:docstring>
            The requested channel type cannot be created with the given handle
          </tp:docstring>
        </tp:error>
        <tp:error name="org.freedesktop.Telepathy.Error.NotCapable">
          <tp:docstring>
            The requested channel cannot be created because contact doesn't
            have the required capabilities.
          </tp:docstring>
        </tp:error>
        <tp:error name="org.freedesktop.Telepathy.Error.Channel.Banned"/>
        <tp:error name="org.freedesktop.Telepathy.Error.Channel.Full"/>
        <tp:error name="org.freedesktop.Telepathy.Error.Channel.InviteOnly"/>
      </tp:possible-errors>
    </method>

    <tp:enum name="Handle_Type" type="u">
      <tp:enumvalue suffix="None" value="0">
        <tp:docstring>
          A "null" handle type used to indicate the absence of a handle.
          When a handle type and a handle appear as a pair, if the handle
          type is zero, the handle must also be zero.
        </tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Contact" value="1">
        <tp:docstring>
          A contact
        </tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Room" value="2">
        <tp:docstring>
          A chat room
        </tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="List" value="3">
        <tp:docstring>
          A server-generated contact list (see Channel.Interface.Group)
        </tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Group" value="4">
        <tp:docstring>
          A user-defined contact list (see Channel.Interface.Group)
        </tp:docstring>
      </tp:enumvalue>
    </tp:enum>

    <tp:simple-type name="Handle" type="u" array-name="Handle_List">
      <tp:docstring>An unsigned 32-bit integer representing a
        handle</tp:docstring>
    </tp:simple-type>

    <tp:simple-type name="Contact_Handle" type="u"
      array-name="Contact_Handle_List">
      <tp:docstring>An unsigned 32-bit integer representing a handle of type
        Handle_Type_Contact</tp:docstring>
    </tp:simple-type>

    <tp:simple-type name="Room_Handle" type="u"
      array-name="Room_Handle_List">
      <tp:docstring>An unsigned 32-bit integer representing a handle of type
        Handle_Type_Room</tp:docstring>
    </tp:simple-type>

    <tp:simple-type name="List_Handle" type="u"
      array-name="List_Handle_List">
      <tp:docstring>An unsigned 32-bit integer representing a handle of type
        Handle_Type_List</tp:docstring>
    </tp:simple-type>

    <tp:simple-type name="Group_Handle" type="u"
      array-name="Group_Handle_List">
      <tp:docstring>An unsigned 32-bit integer representing a handle of type
        Handle_Type_Group</tp:docstring>
    </tp:simple-type>

    <method name="RequestHandles" tp:name-for-bindings="Request_Handles">
      <arg direction="in" name="Handle_Type" type="u" tp:type="Handle_Type">
        <tp:docstring>
          The type of handle required
        </tp:docstring>
      </arg>

      <arg direction="in" name="Identifiers" type="as">
        <tp:docstring>
          An array of identifiers of entities to request handles for
        </tp:docstring>
      </arg>

      <arg direction="out" type="au" tp:type="Handle[]"
        name="Handles">
        <tp:docstring>
          An array of integer handle numbers in the same order as the given identifiers.
        </tp:docstring>
      </arg>

      <tp:docstring>
        Request several handles from the connection manager which represent a
        number of contacts, rooms or server-stored lists on the service. The
        connection manager should record that these handles are in use by the
        client who invokes this method, and must not deallocate the handles
        until the client disconnects from the bus or calls the
        <tp:member-ref>ReleaseHandles</tp:member-ref>
        method. Where the identifier refers to an entity that already has a
        handle in this connection manager, this handle should be returned
        instead. The handle number 0 must not be returned by the connection
        manager.
      </tp:docstring>

      <tp:possible-errors>
        <tp:error name="org.freedesktop.Telepathy.Error.Disconnected"/>
        <tp:error name="org.freedesktop.Telepathy.Error.InvalidHandle">
          <tp:docstring>
            The given identifier does not identify a valid entity of the given
            type.

            <tp:rationale>
              For instance, an XMPP connection would raise this error for
              identifiers with type Handle_Type_Room that do not contain
              exactly one '@' character, that contain spaces, and so on.
            </tp:rationale>
          </tp:docstring>
        </tp:error>
        <tp:error name="org.freedesktop.Telepathy.Error.NotImplemented">
          <tp:docstring>
            The given handle type is not valid, or is not implemented on this
            connection.

            <tp:rationale>
              For instance, a connection to a protocol that doesn't have
              chat rooms would raise this error for room handles, and all CMs
              would raise this error for Handle_Type_None.
            </tp:rationale>
          </tp:docstring>
        </tp:error>
      </tp:possible-errors>
    </method>

    <tp:enum name="Connection_Status" plural="Connection_Statuses" type="u">
      <tp:enumvalue suffix="Connected" value="0">
        <tp:docstring>
            The connection is alive and all methods are available.
        </tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Connecting" value="1">
        <tp:docstring>
            The connection has not yet been established, or has been
            severed and reconnection is being attempted. Some methods may fail
            until the connection has been established.
        </tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Disconnected" value="2">
        <tp:docstring>
            The connection has been severed and no method calls are
            valid. The object may be removed from the bus at any time.
        </tp:docstring>
      </tp:enumvalue>
    </tp:enum>

    <tp:enum name="Connection_Status_Reason" type="u">
      <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
        <p>A reason why the status of the connection changed. Apart from
          Requested, the values of this enumeration only make sense as
          reasons why the status changed to Disconnected.</p>
      </tp:docstring>

      <tp:enumvalue suffix="None_Specified" value="0">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
          <p>There is no reason set for this state change. Unknown status
            reasons SHOULD be treated like this reason.</p>

          <p>When disconnected for this reason, the equivalent D-Bus error is
            <code>org.freedesktop.Telepathy.Error.Disconnected</code>.</p>
        </tp:docstring>
      </tp:enumvalue>

      <tp:enumvalue suffix="Requested" value="1">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
          <p>The change is in response to a user request. Changes to the
            Connecting or Connected status SHOULD always indicate this reason;
            changes to the Disconnected status SHOULD indicate this reason
            if and only if the disconnection was requested by the user.</p>

          <p>When disconnected for this reason, the equivalent D-Bus error is
            <code>org.freedesktop.Telepathy.Error.Cancelled</code>.</p>
        </tp:docstring>
      </tp:enumvalue>

      <tp:enumvalue suffix="Network_Error" value="2">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
          <p>There was an error sending or receiving on the network socket.</p>

          <p>When the status changes from Connecting to Disconnected for this
            reason, the equivalent D-Bus error is either
            <code>org.freedesktop.Telepathy.Error.NetworkError</code>,
            <code>org.freedesktop.Telepathy.Error.ConnectionRefused</code>,
            <code>org.freedesktop.Telepathy.Error.ConnectionFailed</code>
            or some more specific error.</p>

          <p>When the status changes from Connected to Disconnected for this
            reason, the equivalent D-Bus error is either
            <code>org.freedesktop.Telepathy.Error.NetworkError</code>,
            <code>org.freedesktop.Telepathy.Error.ConnectionLost</code>
            or some more specific error.</p>
        </tp:docstring>
      </tp:enumvalue>

      <tp:enumvalue suffix="Authentication_Failed" value="3">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
          <p>The username or password was invalid.</p>

          <p>When disconnected for this reason, the equivalent D-Bus error is
            <code>org.freedesktop.Telepathy.Error.AuthenticationFailed</code>.
          </p>
        </tp:docstring>
      </tp:enumvalue>

      <tp:enumvalue suffix="Encryption_Error" value="4">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
          <p>There was an error negotiating SSL on this connection, or
            encryption was unavailable and require-encryption was set when the
            connection was created.</p>

          <p>When disconnected for this reason, the equivalent D-Bus error is
            <code>org.freedesktop.Telepathy.Error.EncryptionNotAvailable</code>
            if encryption was not available at all, or
            <code>org.freedesktop.Telepathy.Error.EncryptionError</code>
            if encryption failed.</p>
        </tp:docstring>
      </tp:enumvalue>

      <tp:enumvalue suffix="Name_In_Use" value="5">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
          <p>In general, this reason indicates that the requested account
            name or other identification could not be used due to conflict
            with another connection. It can be divided into three cases:</p>

          <ul>
            <li>If the status change is from Connecting to Disconnected
              and the 'register' parameter to RequestConnection was present
              and true, the requested account could not be created on the
              server because it already exists.
              The equivalent D-Bus error is
              <code>org.freedesktop.Telepathy.Error.RegistrationExists</code>.
            </li>

            <li>If the status change is from Connecting to Disconnected
              but the 'register' parameter is absent or false, the connection
              manager could not connect to the specified account because
              a connection to that account already exists.
              The equivalent D-Bus error is
              <code>org.freedesktop.Telepathy.Error.AlreadyConnected</code>.

              <tp:rationale>
                In some protocols, like XMPP (when connecting with the same
                JID and resource as an existing connection), the existing
                connection "wins" and the new one fails to connect.
              </tp:rationale>
            </li>

            <li>If the status change is from Connected to Disconnected,
              the existing connection was automatically disconnected because
              a new connection to the same account (perhaps from a different
              client or location) was established.
              The equivalent D-Bus error is
              <code>org.freedesktop.Telepathy.Error.ConnectionReplaced</code>.

              <tp:rationale>
                In some protocols, like MSNP (when connecting twice with the
                same Passport), the new connection "wins" and the
                existing one is automatically disconnected.
              </tp:rationale>
            </li>
          </ul>
        </tp:docstring>
      </tp:enumvalue>

      <tp:enumvalue suffix="Cert_Not_Provided" value="6">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
          <p>The server did not provide a SSL certificate.</p>

          <p>When disconnected for this reason, the equivalent D-Bus error is
            <code>org.freedesktop.Telepathy.Error.Cert.NotProvided</code>.
          </p>
        </tp:docstring>
      </tp:enumvalue>

      <tp:enumvalue suffix="Cert_Untrusted" value="7">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
          <p>The server's SSL certificate is signed by an untrusted certifying
            authority. This error SHOULD NOT be used to represent a self-signed
            certificate: use the more specific Cert_Self_Signed reason for
            that.</p>

          <p>When disconnected for this reason, the equivalent D-Bus error is
            <code>org.freedesktop.Telepathy.Error.Cert.Untrusted</code>.
          </p>
        </tp:docstring>
      </tp:enumvalue>

      <tp:enumvalue suffix="Cert_Expired" value="8">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
          <p>The server's SSL certificate has expired.</p>

          <p>When disconnected for this reason, the equivalent D-Bus error is
            <code>org.freedesktop.Telepathy.Error.Cert.Expired</code>.
          </p>
        </tp:docstring>
      </tp:enumvalue>

      <tp:enumvalue suffix="Cert_Not_Activated" value="9">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
          <p>The server's SSL certificate is not yet valid.</p>

          <p>When disconnected for this reason, the equivalent D-Bus error is
            <code>org.freedesktop.Telepathy.Error.Cert.NotActivated</code>.
          </p>
        </tp:docstring>
      </tp:enumvalue>

      <tp:enumvalue suffix="Cert_Hostname_Mismatch" value="10">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
          <p>The server's SSL certificate did not match its hostname.</p>

          <p>When disconnected for this reason, the equivalent D-Bus error is
            <code>org.freedesktop.Telepathy.Error.Cert.HostnameMismatch</code>.
          </p>
        </tp:docstring>
      </tp:enumvalue>

      <tp:enumvalue suffix="Cert_Fingerprint_Mismatch" value="11">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
          <p>The server's SSL certificate does not have the expected
            fingerprint.</p>

          <p>When disconnected for this reason, the equivalent D-Bus error is
            <code>org.freedesktop.Telepathy.Error.Cert.FingerprintMismatch</code>.
          </p>
        </tp:docstring>
      </tp:enumvalue>

      <tp:enumvalue suffix="Cert_Self_Signed" value="12">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
          <p>The server's SSL certificate is self-signed.</p>

          <p>When disconnected for this reason, the equivalent D-Bus error is
            <code>org.freedesktop.Telepathy.Error.Cert.HostnameMismatch</code>.
          </p>
        </tp:docstring>
      </tp:enumvalue>

      <tp:enumvalue suffix="Cert_Other_Error" value="13">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
          <p>There was some other error validating the server's SSL
            certificate.</p>

          <p>When disconnected for this reason, the equivalent D-Bus error is
            <code>org.freedesktop.Telepathy.Error.Cert.Invalid</code>.
          </p>
        </tp:docstring>
      </tp:enumvalue>
    </tp:enum>

    <signal name="ConnectionError" tp:name-for-bindings="Connection_Error">
      <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
        <p>Emitted when an error occurs that renders this connection unusable.
        </p>

        <p>Whenever this signal is emitted, it MUST immediately be followed by
          a <tp:member-ref>StatusChanged</tp:member-ref> signal with status
          Connection_Status_Disconnected and an appropriate reason
          code.</p>

        <p>Connection managers SHOULD emit this signal on disconnection, but
          need not do so. Clients MUST support connection managers that emit
          StatusChanged(Disconnected, ...) without first emitting
          ConnectionError.</p>

        <tp:rationale>
          <p>This signal provides additional information about the reason
            for disconnection. The reason for connection is always
            straightforward - it was requested - so it does not need further
            explanation. However, on errors, it can be useful to provide
            additional information.</p>

          <p>The <tp:type>Connection_Status_Reason</tp:type> is not given
            here, since it will be signalled in
            <tp:member-ref>StatusChanged</tp:member-ref>. A reasonable client
            implementation would be to store the information given by this
            signal until StatusChanged is received, at which point the
            information given by this signal can be used to supplement the
            StatusChanged signal.</p>
        </tp:rationale>
      </tp:docstring>

      <arg name="Error" type="s" tp:type="DBus_Error_Name">
        <tp:docstring>
          The name of a D-Bus error describing the error that occurred,
          which may correspond to a
          <tp:type>Connection_Status_Reason</tp:type>, or may be a more
          specific Telepathy error
          (such as
          <code>org.freedesktop.Telepathy.Errors.ConnectionRefused</code>
          for Connection_Status_Reason_Network_Error)
          or a protocol-specific or connection-manager-specific error in a
          suitable namespace.

          <tp:rationale>
            For instance, a SIP connection manager could signal
            "402 Payment Required" as an error in a
            connection-manager-specific namespace, or a link-local
            XMPP implementation that used Avahi could provide the error
            given to it by the avahi-daemon.
          </tp:rationale>
        </tp:docstring>
      </arg>

      <arg name="Details" type="a{sv}" tp:type="String_Variant_Map">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
          <p>Additional information about the error, which may include
            the following well-known keys:</p>

          <dl>
            <dt>debug-message (s)</dt>
            <dd>Debugging information on the change, corresponding to the
              message part of a D-Bus error message, which SHOULD NOT be
              displayed to users under normal circumstances</dd>
          </dl>

          <tp:rationale>
            <p>This argument allows for future extensions. For instance,
              if indicating DNS lookup failure, we could define a key
              that indicates the hostname that could not be found.</p>
          </tp:rationale>
        </tp:docstring>
      </arg>

    </signal>

    <signal name="StatusChanged" tp:name-for-bindings="Status_Changed">
      <arg name="Status" type="u" tp:type="Connection_Status">
        <tp:docstring>
          An integer indicating the new status, as defined by ConnectionStatus
        </tp:docstring>
      </arg>

      <arg name="Reason" type="u" tp:type="Connection_Status_Reason">
        <tp:docstring>
          An integer indicating the reason for the status change, as defined
          by ConnectionStatusReason
        </tp:docstring>
      </arg>

      <tp:docstring>
        Emitted when the status of the connection changes.  All states and
        reasons have numerical values, as defined in ConnectionStatus
        and ConnectionStatusReason.
      </tp:docstring>
    </signal>

    <tp:contact-attribute name="contact-id" type="s">
      <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
        <p>The same string that would be returned by
          <tp:member-ref>InspectHandles</tp:member-ref>. As a special case,
          this is always present in the result of <tp:dbus-ref
            namespace="org.freedesktop.Telepathy.Connection.Interface.Contacts">GetContactAttributes</tp:dbus-ref>,
          whether it was explicitly requested or not.</p>
      </tp:docstring>
    </tp:contact-attribute>

    <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
      <p>This models a connection to a single user account on a communication
        service. Its basic capability is to provide the facility to request and
        receive channels of differing types (such as text channels or streaming
        media channels) which are used to carry out further communication.</p>

      <p>In order to allow Connection objects to be discovered by new clients,
        the object path and well-known bus name MUST be of the form
        <code>/org/freedesktop/Telepathy/Connection/cmname/proto/account</code>
        and
        <code>org.freedesktop.Telepathy.Connection.cmname.proto.account</code>
        where:</p>

      <ul>
        <li><em>cmname</em> is the same
          <tp:type>Connection_Manager_Name</tp:type> that appears
          in the connection manager's object path and well-known bus name</li>
        <li><em>proto</em> is the <tp:type>Protocol</tp:type> name as seen in
          <tp:dbus-ref namespace="org.freedesktop.Telepathy.ConnectionManager">ListProtocols</tp:dbus-ref>,
          but with "-" replaced with "_" to get a valid
          object path/bus name</li>
        <li><em>account</em> is some non-empty sequence of ASCII letters,
          digits and underscores not starting with a digit</li>
      </ul>

      <p><em>account</em> SHOULD be formed such that any valid distinct
        connection instance on this protocol has a distinct name. This
        might be formed by including the server name followed by the user
        name (escaped via some suitable mechanism like telepathy-glib's
        tp_escape_as_identifier() function to preserve uniqueness); on
        protocols where connecting multiple times is permissable, a
        per-connection identifier might be necessary to ensure
        uniqueness.</p>

      <p>Clients MAY parse the object path to determine the connection
        manager name and the protocol, but MUST NOT attempt to parse the
        <em>account</em> part. Connection managers MAY use any unique string
        for this part.</p>

    <p>As well as the methods and signatures below, arbitrary interfaces may be
    provided by the Connection object to represent extra connection-wide
    functionality, such as the Connection.Interface.SimplePresence for
    receiving and
    reporting presence information, and Connection.Interface.Aliasing for
    connections where contacts may set and change an alias for themselves.
    These interfaces can be discovered using the
    <tp:member-ref>GetInterfaces</tp:member-ref> method.</p>

    <p>Contacts, rooms, and server-stored lists (such as subscribed contacts,
    block lists, or allow lists) on a service are all represented by
    immutable <em>handles</em>, which are unsigned non-zero integers which are
    valid only for the lifetime of the connection object, and are used
    throughout the protocol where these entities are represented, allowing
    simple testing of equality within clients.</p>

    <p>Zero as a handle value is sometimes used as a "null" value to mean
    the absence of a contact, room, etc.</p>

    <p>Handles have per-type uniqueness, meaning that
    every (handle type, handle number) tuple is guaranteed to be unique within
    a connection and that a handle alone (without its type) is meaningless or
    ambiguous. Connection manager implementations should reference count these
    handles to determine if they are in use either by any active clients or any
    open channels, and may deallocate them when this ceases to be true. Clients
    may request handles of a given type and identifier with the
    <tp:member-ref>RequestHandles</tp:member-ref> method, inspect the entity
    identifier with the <tp:member-ref>InspectHandles</tp:member-ref>
    method, keep handles from being released with
    <tp:member-ref>HoldHandles</tp:member-ref>, and notify that they are no
    longer storing handles with
    <tp:member-ref>ReleaseHandles</tp:member-ref>.</p>
    </tp:docstring>

    <tp:changed version="0.17.10">Previously, the account part of
      Connection bus names/object paths was allowed to have more than one
      component (i.e. contain dots or slashes), resulting in Connection
      bus names and object paths with more than 7 components. We now restrict
      Connection bus names/object paths to have exactly 7
      components.</tp:changed>

    <tp:changed version="0.17.23">The Requests and Contacts interfaces
      are now mandatory. Their functionality will be merged into the main
      Connection interface at some point in future.</tp:changed>

  </interface>
</node>
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