path: root/spec/Connection_Interface_Location.xml

<?xml version="1.0" ?>
<node name="/Connection_Interface_Location"
  xmlns:tp="http://telepathy.freedesktop.org/wiki/DbusSpec#extensions-v0">
  <tp:copyright>Copyright (C) 2008 Collabora Ltd.</tp:copyright>
  <tp:copyright>Copyright (C) 2008 Nokia Corporation</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.Interface.Location">
    <tp:added version="0.17.27">(as stable API)</tp:added>
    <tp:requires interface="org.freedesktop.Telepathy.Connection"/>

    <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
      <p>An interface on connections to support protocols which allow users to
        publish their current geographical location, and subscribe to the
        current location of their contacts.</p>

      <p>This interface is geared strongly towards automatic propagation and
        use of this information, so focuses on latitude, longitude and
        altitude which can be determined by GPS, although provision is also
        included for an optional human-readable description of locations. All
        co-ordinate information is required to be relative to the WGS84
        datum.</p>

      <p>The information published through this interface is intended to have
        the same scope as presence information, so will normally be made
        available to those individuals on the user's "publish" contact list.
        Even so, user interfaces should not automatically publish location
        information without the consent of the user, and it is recommended
        that an option is made available to reduce the accuracy of the
        reported information to allow the user to maintain their privacy.</p>

      <p>Location information is represented using the terminology of XMPP's
        <a href="http://www.xmpp.org/extensions/xep-0080.html">XEP-0080</a>
        or the XEP-0080-derived
        <a href="http://geoclue.freedesktop.org/">Geoclue</a> API where
        possible.</p>

      <p>Clients of this interface SHOULD register an interest in it by calling
        <tp:dbus-ref namespace="org.freedesktop.Telepathy"
          >Connection.AddClientInterest</tp:dbus-ref> with an argument
        containing the name of this interface,
        before calling any Location method. If they do so, they SHOULD also call
        <tp:dbus-ref namespace="org.freedesktop.Telepathy"
          >Connection.RemoveClientInterest</tp:dbus-ref> after use to allow
        the CM to release resources associated with this interface.</p>
    </tp:docstring>

    <!-- Potentially to be reinstated later:
         http://bugs.freedesktop.org/show_bug.cgi?id=19585
    <tp:enum name="Location_Accuracy_Level" type="u">
      <tp:docstring>
        A location accuracy level. This should be kept in sync with
        GeoclueAccuracyLevel in the Geoclue project.
      </tp:docstring>

      <tp:enumvalue suffix="None" value="0">
        <tp:docstring>
          The accuracy is unspecified.
        </tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Country" value="1">
        <tp:docstring>
          The location indicates the contact's country.
        </tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Region" value="2">
        <tp:docstring>
          The location indicates the contact's region within a country.
        </tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Locality" value="3">
        <tp:docstring>
          The location indicates the contact's locality within a region
          (e.g. the correct city).
        </tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Postal_Code" value="4">
        <tp:docstring>
          The location indicates the correct postal code.
        </tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Street" value="5">
        <tp:docstring>
          The location indicates the correct street.
        </tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Detailed" value="6">
        <tp:docstring>
          The location's accuracy is given by the accuracy key.
        </tp:docstring>
      </tp:enumvalue>
    </tp:enum>
    -->

    <tp:mapping name="Location">
      <tp:docstring>
        A user's location, represented as an extensible mapping.
      </tp:docstring>

      <tp:member name="Key" type="s">
        <tp:docstring xmlns="http://www.w3.org/1999/xhtml">

          <p>Civic addresses are represented by the following well-known
            keys (all of which have string values), which should be kept in
            sync with those used in XEP-0080 and in the Geoclue project:</p>

          <ul>
            <li>countrycode - s: an ISO-3166-1 alpha-2 (two-letter) country
              code, e.g. "us", "gb", "fr"</li>
            <li>country - s: a country name in unspecified locale, e.g.
              "USA"</li>
            <li>region - s: an administrative region of the nation, such as a
              state or province</li>
            <li>locality - s: a locality within the administrative region, such
              as a town or city</li>
            <li>area - s: a named area such as a campus or neighborhood</li>
            <li>postalcode - s: a code used for postal delivery</li>
            <li>street - s: a thoroughfare within the locality, or a crossing of
              two thoroughfares</li>
          </ul>

          <p>The following address keys are defined in XEP-0080 but not by
            Geoclue, and are also allowed:</p>

          <ul>
            <li>building - s: a specific building on a street or in an area</li>
            <li>floor - s: a particular floor in a building</li>
            <li>room - s: a particular room in a building</li>
            <li>text - s: any more specific information, e.g.
              "Northwest corner of the lobby"</li>
            <li>description - s: A natural-language name for or description of
              the location, e.g. "Bill's house"</li>
            <li>uri - s: a URI representing the location or pointing to more
              information about it</li>
          </ul>

          <p>Since the previous strings have data intended to be read by users,
            the language used should be stated using:</p>

          <ul>
            <li>language - s: a specific language or locale of location
              information in a format compatible to RFC 4646. Note that UTF-8
              is the only allowed encoding, e.g. "en" or "fr-CA".</li>
          </ul>

          <p>Positions are represented by the following well-known keys:</p>

          <ul>
            <li>lat - d: latitude in decimal degrees north, -90 to +90,
              relative to the WGS-84 datum
              <tp:rationale>
                This is from XEP-0080; the XEP allows use of a different
                datum, but recommends this one. We enforce sanity by requiring
                a consistent datum: a minimal compliant implementation of this
                specification in terms of XEP-0080 would simply ignore the
                &lt;lat&gt; and &lt;lon&gt; elements if &lt;datum&gt; exists
                and has a value other than WGS-84, while an advanced
                implementation might correct for the different datum.
              </tp:rationale>
            </li>
            <li>lon - d: Longitude in decimal degrees east, -180 to +180,
              relative to the WGS-84 datum
              <tp:rationale>
                Same rationale as 'lat'
              </tp:rationale>
            </li>
            <li>alt - d: altitude in metres above sea level (negative
              if below sea level)
              <tp:rationale>
                This is from XEP-0080
              </tp:rationale>
            </li>

            <!-- Potentially to be reinstated later:
                 http://bugs.freedesktop.org/show_bug.cgi?id=19585
            <li>accuracy-level - i (<tp:type>Location_Accuracy_Level</tp:type>):
              an indication of accuracy, which SHOULD be omitted if it would be
              Location_Accuracy_Level_None or
              Location_Accuracy_Level_Detailed
              <tp:rationale>
                This is a struct field in GeoClue; the name is new in this
                specification, and was chosen in an attempt to avoid clashing
                with any future XEP-0080 terminology.
              </tp:rationale>
            </li>
            -->

            <li>accuracy - d: horizontal position error in metres if
              known
              <tp:rationale>
                This is from XEP-0080
              </tp:rationale>
            </li>
          </ul>

          <p>Velocities are represented by the following well-known keys:</p>

          <ul>
            <li>speed - d: speed in metres per second
              <tp:rationale>
                This is from XEP-0080
              </tp:rationale>
            </li>
            <li>bearing - d: direction of movement in decimal degrees,
              where North is 0 and East is 90
              <tp:rationale>
                This is from XEP-0080, and is equivalent to the struct field
                called "direction" in GeoClue
              </tp:rationale>
            </li>
          </ul>

          <p>Other well-known keys:</p>

          <ul>
            <li>timestamp - x (<tp:type>Unix_Timestamp64</tp:type>): the time
              that the contact was at this location, in seconds since
              1970-01-01T00:00:00Z (i.e. the beginning of 1970 in UTC)
              <tp:rationale>
                XEP-0080 uses an ISO 8601 string for this, but a number of
                seconds since the epoch is probably easier to work with.
              </tp:rationale>
            </li>
          </ul>
        </tp:docstring>
      </tp:member>

      <tp:member name="Value" type="v">
        <tp:docstring>
          The value corresponding to the well-known key.
        </tp:docstring>
      </tp:member>
    </tp:mapping>

    <tp:mapping name="Contact_Locations" type="a{ua{sv}}">
      <tp:docstring>
        A map from contacts to their locations.
      </tp:docstring>
      <tp:member name="Contact" type="u" tp:type="Contact_Handle">
        <tp:docstring>A contact</tp:docstring>
      </tp:member>
      <tp:member name="Location" type="a{sv}" tp:type="Location">
        <tp:docstring>The contact's location, which MAY be empty to indicate
          that the contact's location is unknown</tp:docstring>
      </tp:member>
    </tp:mapping>

    <method name="GetLocations" tp:name-for-bindings="Get_Locations">
      <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
        <p>Return the current locations of the given contacts, if they are
          already known. If any of the given contacts' locations are not known,
          request their current locations, but return immediately without waiting
          for a reply; if a reply with a non-empty location is later received
          for those contacts, the <tp:member-ref>LocationUpdated</tp:member-ref>
          signal will be emitted for them.</p>

        <tp:rationale>
          <p>This method is appropriate for "lazy" location finding, for instance
            displaying the location (if available) of everyone in your contact
            list.</p>
        </tp:rationale>

        <p>For backwards compatibility, if this method is called by a client
          whose "interest count" for this interface, as defined by <tp:dbus-ref
            namespace="org.freedesktop.Telepathy"
            >Connection.AddClientInterest</tp:dbus-ref>, is zero, the
          Connection SHOULD behave as if AddClientInterest had been called for
          this interface just before that method call. Clients that do not
          explicitly call AddClientInterest SHOULD NOT call <tp:dbus-ref
            namespace="org.freedesktop.Telepathy"
            >Connection.RemoveClientInterest</tp:dbus-ref> either.</p>
      </tp:docstring>

      <arg direction="in" name="Contacts" type="au" tp:type="Contact_Handle[]">
        <tp:docstring>
          The contacts whose locations should be returned or signalled.
        </tp:docstring>
      </arg>

      <arg direction="out" name="Locations" type="a{ua{sv}}"
        tp:type="Contact_Locations">
        <tp:docstring>
          The contacts' locations, if already known. Contacts whose locations
          are not already known are omitted from the mapping; contacts known
          to have no location information appear in the mapping with an empty
          Location dictionary.
        </tp:docstring>
      </arg>

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

    <method name="RequestLocation" tp:name-for-bindings="Request_Location">
      <tp:docstring>
        Return the current location of the given contact. If necessary, make
        a request to the server for up-to-date information, and wait for a
        reply.

        <tp:rationale>
          This method is appropriate for use in a "Contact Information..."
          dialog; it can be used to show progress information (while waiting
          for the method to return), and can distinguish between various error
          conditions.
        </tp:rationale>
      </tp:docstring>

      <arg direction="in" name="Contact" type="u" tp:type="Contact_Handle">
        <tp:docstring>
          The contact whose location should be returned.
        </tp:docstring>
      </arg>

      <arg direction="out" name="Location" type="a{sv}" tp:type="Location">
        <tp:docstring>
          The contact's location. It MAY be empty, indicating that no location
          information was found.
        </tp:docstring>
      </arg>

      <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.InvalidHandle"/>
        <tp:error name="org.freedesktop.Telepathy.Error.PermissionDenied">
          <tp:docstring>
            The requested contact does not allow the local user to see their
            location information.
          </tp:docstring>
        </tp:error>
      </tp:possible-errors>
    </method>

    <signal name="LocationUpdated" tp:name-for-bindings="Location_Updated">
      <tp:docstring>
        Emitted when a contact's location changes or becomes known.
      </tp:docstring>

      <arg name="Contact" type="u" tp:type="Contact_Handle">
        <tp:docstring>
          The contact
        </tp:docstring>
      </arg>
      <arg name="Location" type="a{sv}" tp:type="Location">
        <tp:docstring>
          The contact's location, or empty to indicate that nothing is known
          about the contact's location.
        </tp:docstring>
      </arg>
    </signal>

    <method name="SetLocation" tp:name-for-bindings="Set_Location">
      <tp:docstring>
        Set the local user's own location.
      </tp:docstring>

      <arg direction="in" name="Location" type="a{sv}">
        <tp:docstring>
          The location to advertise. If the user wants to obscure their
          exact location by reducing the precision or accuracy, clients
          MUST do this themselves, rather than relying on the connection
          manager to do so. Clients that interact with more than one
          connection SHOULD advertise the same reduced-accuracy location
          to all of them, so that contacts cannot obtain an undesirably
          accurate location by assuming that random errors have been added
          and averaging the locations advertised on multiple connections.
        </tp:docstring>
      </arg>

      <tp:possible-errors>
        <tp:error name="org.freedesktop.Telepathy.Error.Disconnected"/>
        <tp:error name="org.freedesktop.Telepathy.Error.NotImplemented">
          <tp:docstring>
            The user's server does not support publishing their own location.
            If it is possible to determine this ahead of time, the
            <code>Can_Set</code> flag will not be set in
            <tp:member-ref>SupportedLocationFeatures</tp:member-ref>.
          </tp:docstring>
        </tp:error>
        <tp:error name="org.freedesktop.Telepathy.Error.PermissionDenied"/>
      </tp:possible-errors>
    </method>

    <property name="LocationAccessControlTypes" type="au" access="read"
      tp:type="Rich_Presence_Access_Control_Type[]" tp:name-for-bindings="Location_Access_Control_Types">
      <tp:docstring>The types of access control that are supported by this
        connection.</tp:docstring>
    </property>

    <property name="LocationAccessControl" type="(uv)" access="readwrite"
      tp:type="Rich_Presence_Access_Control" tp:name-for-bindings="Location_Access_Control">
      <tp:docstring>The current access control mechanism and settings
        for this connection. Before publishing location for the first time,
        if this has not been set by a client, implementations SHOULD
        set it to be as restrictive as possible (an empty whitelist, if
        supported).</tp:docstring>
    </property>

    <property name="SupportedLocationFeatures"
        tp:name-for-bindings="Supported_Location_Features"
        type="u" tp:type="Location_Features" access="read">
      <tp:added version="0.19.6"/>
      <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
        Indicates the Location features supported by this connection. This
        property MAY be undefined before <tp:dbus-ref
          namespace="org.freedesktop.Telepathy.Connection">Status</tp:dbus-ref>
        becomes <code>Connected</code>, but MUST remain constant thereafter.
      </tp:docstring>
    </property>

    <tp:flags name="Location_Features" type="u" value-prefix="Location_Feature">
      <tp:flag suffix="Can_Set" value="1">
        <tp:docstring>
          Indicates that setting your own location with
          <tp:member-ref>SetLocation</tp:member-ref> is supported on this
          connection.
        </tp:docstring>
      </tp:flag>

      <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
        Flags describing the Location features which may be supported on any
        given connection.
      </tp:docstring>
    </tp:flags>

    <tp:contact-attribute name="location"
      type="a{sv}" tp:type="Location">
      <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
        <p>The same mapping that would be returned by
          <tp:member-ref>GetLocations</tp:member-ref> for this contact.
          Omitted from the result if the contact's location
          is not known.</p>

        <p>For backwards compatibility, if contact attributes that include
          this interface are requested
          by a client whose "interest count" for this interface, as defined by
          <tp:dbus-ref namespace="org.freedesktop.Telepathy"
            >Connection.AddClientInterest</tp:dbus-ref>, is zero, the
          Connection SHOULD behave as if AddClientInterest was called for this
          interface just before that request. Clients that do not explicitly
          call AddClientInterest SHOULD NOT call <tp:dbus-ref
            namespace="org.freedesktop.Telepathy"
            >Connection.RemoveClientInterest</tp:dbus-ref> either.</p>
      </tp:docstring>
    </tp:contact-attribute>

  </interface>
</node>
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