h1. Client Control Interface

The Client Control Interface is http based. The webserver of the eCard client is available only under http://localhost:24724.

h2. Activation

*URL*
@http://127.0.0.1:24727/eID-Client@

*Method*
GET

*Query*
| tcTokenURL    | The URL determines where the client can retrieve the TC Token. See TR-03112-7, section 3.2 | Mandatory | 
| ifdName       | The ifdName determines the card terminal.|  Optional[1] | 
| slotIndex     | The slotIndex determines the slot in the terminal.| Optional[1] |
| contextHandle | The contextHandle addresses a specific IFD. | Optional[1] | 
| slotHandle    | The slotHandle determines a connected eCard. See TR-03112-6, section 3.2.1. | Optional[1] | 
| cardType      | The cardType determines the type of card which must be selected. | Optional[1] |

*Returns*
| 200 OK                    | The refresh address is comprised in the Message Body (Hack for Mac OS Safari). |
| 303 See Other             | The Location field in the response should contain the refresh address. |
| 400 Bad Request           | Malformed GET request, e.g. parameters are missing. |
| 500 Internal Server Error | Other errors. |
| 502 Bad Gateway           | Server where the TCToken was requested, didn't answer or returned an invalid response. |

*Content-Types*
| text/html | Webpage with user evaluatable content. E.g. error page, manual redirect, ... |


*Description*
The interface can be used to start the eID application.

The parameters ifdName, contextHandle, slotHandle and cardType address a particular eCard, or a type of card.
There are three meaningful combinations of the optional parameters:
* _none_
 Use the fist nPa available. Display a "Please insert nPa" dialog if needed. This is the behaviour of the AusweisApp.
 In other words the lack of the cardType parameter sets it to the default value @http://bsi.bund.de/cif/npa.xml@, and thus the next rule becomes effective.
* _cardType_
 Use the fist card of the specified type which is available. Display a "Please insert <cardType>" dialog if needed.
 A special case must be made when software certificates (cardType=@http://openecard.org/cif/soft-credential@) are used. In that case no dialog is shown, when there is no certificate. Instead an error is produced.
* _ifdName_, _contextHandle_, _slotHandle_
 Use exactly the card matching the parameters.
  cardType is requested from the selected card directly. If there is no such card, an error is produced.


*Notes*

<pre>
TODO
* What happens if the Client Activator cannot start an application?
</pre>

During the processing of the activation, a TCToken is fetched from a remote server.
The TCToken is defined as follows:
<pre><code class="xml">
<element name="TCToken" type="TCTokenType" />

<complexType name="TCTokenType">
  <sequence>
    <element name="ServerAddress" type="anyURI" />
    <element name="SessionIdentifier" type="string" />
    <element name="RefreshAddress" type="anyURI" />
    <element name="CommunicationErrorAddress" type="anyURI" minOccurs="0" />
    <element name="Binding" type="anyURI" />
    <element name="PathSecurity-Protocol" type="anyURI" minOccurs="0" />
    <element name="PathSecurity-Parameters" minOccurs="0">
      <complexType>
        <choice>
          <element name="PSK" type="hexBinary" />
        </choice>
      </complexType>
    </element>
  </sequence>
</complexType>
</code></pre>

The contents of the elements are defined as follows:
* ServerAddress
 Must contain a https-URL which shall be used by the eCA to connect to the authentication server.
* SessionIdentifier
 Must contain a unique identifier of the current authentication session.
* RefreshAddress
 Must be a https-URL. The eCA redirects the browser to this URL (or the URL retrieved by following redirects starting from this URL) after conclusion of the online authentication.
* CommunicationErrorAddress
 If present, the eID-Client redirects the browser to this URL if an communication error occurred and no valid refreshURL could be determined. The URL MAY contain a session ID.
* Binding
 Must be used to indicate that an authentication protocol according to [ISO24727-3] is to be performed over the session between eCA and the authentication server.
 Currently the following values are defined:
** @urn:liberty:paos:2006-08@
** @urn:ietf:rfc:2616@
* PathSecurity-Protocol
 This element specifies the security protocol, which is to be used for securing the connection between eCA and AS.
 Currently the following values are defined:
** @urn:ietf:rfc:4346@
   TLS according to [RFC4346].
** @urn:ietf:rfc:4279@
   TLS-PSK according to [RFC4279].
** @urn:ietf:rfc:5487@
   TLS-PSK with a cipher suite according to [RFC5487].
* PathSecurity-Parameter
   May be present to supply path security parameters such as PSK values.

The following changes are made to the token type defined in [eCard-7]:
* PathSecurity-Protocol has an additional value. (@urn:ietf:rfc:4346@)
* PathSecurity-Parameter is optional because of the additional default TLS Protocol.

h2. GetStatus[1]

*URL*
@http://127.0.0.1:24727/getStatus@

*Method*
GET

*Query*
| session | The session parameter establishes an event queue for further requests with waitforChange. | Optional | 

*Returns*
| 200 OK                    | Status element (see below). |
| 400 Bad Request           | Malformed GET request, e.g. session parameter is too weak. | 
| 500 Internal Server Error | Errors in the smartcard stack or the webserver. |

<pre><code class="xml">
<complexType name="StatusType" xmlns:oec="http://ws.openecard.org/schema" targetNamespace="http://ws.openecard.org/schema">
  <sequence>
    <element name="ConnectionHandle" type="iso:ConnectionHandleType" maxOccurs="unbounded" minOccurs="0" />
    <element name="UserAgent"                                        maxOccurs="1"         minOccurs="0">
      <complexType>
        <sequence>
          <element name="Name"            type="string" />
          <element name="VersionMajor"    type="integer" />
          <element name="VersionMinor"    type="integer" maxOccurs="1" minOccurs="0" />
          <element name="VersionSubminor" type="integer" maxOccurs="1" minOccurs="0" />
        </sequence>
      </complexType>
    </element>
    <element name="SupportedAPIVersions" maxOccurs="unbounded" minOccurs="0">
      <complexType>
        <sequence>
          <element name="Name"            type="string" />
          <element name="VersionMajor"    type="integer" />
          <element name="VersionMinor"    type="integer" maxOccurs="1" minOccurs="0"/>
          <element name="VersionSubminor" type="integer" maxOccurs="1" minOccurs="0"/>
        </sequence>
      </complexType>
    </element>
    <element name="SupportedCards" maxOccurs="unbounded" minOccurs="0">
      <complexType>
        <sequence>
          <element name="CardType" type="anyURI" maxOccurs="1" minOccurs="1" />
          <element name="DIDProtocols" type="anyURI" maxOccurs="unbounded" minOccurs="0" />
        </sequence>
      </complexType>
    </element>
    <element name="SupportedDIDProtocols" type="anyURI" maxOccurs="unbounded" minOccurs="0" />
    <element name="AdditionalFeatures"    type="anyURI" maxOccurs="unbounded" minOccurs="0" />
  </sequence>
</complexType>

<element name="Status">
  <complexType>
    <complexContent>
      <extension base="oec:StatusType">
        <sequence />
      </extension>
    </complexContent>
  </complexType>
</element>
</code></pre>

The contents of the Status element are defined as follows:
* ConnectionHandle
  List of ConnectionHandles reflecting the currently available terminals, cards and their types.
* UserAgent
  Description of the user agent (client). 
** Name must be set to "Open eCard App" for all client types of the Open eCard App.
** VersionMajor, VersionMinor and VersionSubminor correspond to the major, minor and patch fields in the Version class.
   (see source:common/src/main/java/org/openecard/client/common/Version.java)
* SupportedAPIVersions
  This element names and describes all supported API versions. At the moment, this is solely the eCard-API.
** Name and the version elements are one of
*** @http://www.bsi.bund.de/ecard/api@, 1, 1, @not set@
* SupportedCards
  List of supported DIDProtocols per card type. That means the list of DIDProtocols, for which an implementation exists and which are listed in the respective CardInfo file.
* SupportedDIDProtocols
  List of supported DID protocols. That means the list of SAL modules' DID protocol URIs registered in the client.
* AdditionalFeatures
  Not yet defined, but could be further stuff like a Signature plugin etc.

*Content-Types*
| text/xml  | The Status element. |
| text/html | Message in case of an error. |


*Description*
The interface can be used to request information about the eID application and its current state.

h2. WaitForChange

*URL*
@http://127.0.0.1:24727/waitForChange@

*Method*
GET

*Query*
| session | The session of a previously set up event queue (see [[Client_Activation#GetStatus1|GetStatus]]). | Mandatory | 

*Returns*
| 200 OK                    | StatusChange element (see below). |
| 400 Bad Request           | Malformed GET request, e.g. session parameter is too weak. |
| 500 Internal Server Error | Errors in the smartcard stack or the webserver. |

<pre><code class="xml">
<complexType name="StatusChangeType" xmlns:oec="http://ws.openecard.org/schema" targetNamespace="http://ws.openecard.org/schema">
  <sequence>
    <element name="ConnectionHandle" type="iso:ConnectionHandleType" maxOccurs="1" minOccurs="1" />
    <element name="Action"           type="anyURI"                   maxOccurs="1" minOccurs="1" />
  </sequence>
</complexType>

<element name="StatusChange">
  <complexType>
    <complexContent>
      <extension base="oec:StatusChangeType">
        <sequence />
      </extension>
    </complexContent>
  </complexType>
</element>
</code></pre>

The contents of the StatusChange element are defined as follows:

* ConnectionHandle
  The meaning of the ConnectionHandle parameter is exactly as in the StartPAOS call defined in [BSI-TR-03112-7, Section 2.6].
* Action
  This element contains the URI describing the event. Currently there are the following event types defined:
** http://openecard.org/event/terminal_added
** http://openecard.org/event/terminal_removed
** http://openecard.org/event/card_inserted
** http://openecard.org/event/card_removed
** http://openecard.org/event/card_recognized


*Content-Types*
| text/xml  | The StatusChange element. |
| text/html | Message in case of an error. |


*Description*
The interface can be used to request status change information after an initial GetStatus call.


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fn1. Openecard proposal: This parameter/interface is an Open eCard specific extension. It is not part of the official eCard specification.