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diff --git a/doc/afb-application-writing.html b/doc/afb-application-writing.html index 2547cee9..bb957455 100644 --- a/doc/afb-application-writing.html +++ b/doc/afb-application-writing.html @@ -15,11 +15,11 @@ Author: José Bollo <p><ul> <li><a href="#HOWTO.WRITE.an.APPLICATION.above.AGL.FRAMEWORK">HOWTO WRITE an APPLICATION above AGL FRAMEWORK</a> <ul> - <li><a href="#Languages.for.writing.Applications">Languages for writing Applications</a> + <li><a href="#Programmation.Languages.for.Applications">Programmation Languages for Applications</a> <ul> <li><a href="#Writing.an.HTML5.application">Writing an HTML5 application</a></li> <li><a href="#Writing.a.Qt.application">Writing a Qt application</a></li> - <li><a href="#Writing.a.C.application">Writing a C application</a></li> + <li><a href="#Writing..C..application">Writing "C" application</a></li> </ul> </li> <li><a href="#Handling.sessions.within.applications">Handling sessions within applications</a> @@ -55,39 +55,36 @@ Author: José Bollo </li> </ul></p> -<a name="Languages.for.writing.Applications"></a> -<h2>Languages for writing Applications</h2> +<a name="Programmation.Languages.for.Applications"></a> +<h2>Programmation Languages for Applications</h2> <a name="Writing.an.HTML5.application"></a> <h3>Writing an HTML5 application</h3> -<p>Developpers of HTML5 applications (client side) can easyly create -applications for AGL framework using their prefered -HTML framework.</p> +<p>Developers of HTML5 applications (client side) can easily create +applications for AGL framework using their preferred +HTML5 framework.</p> -<p>Developpers can also create powerful server side plugins to improve -their application. This server side plugin should return the mime-type -application/json and can be accessed either by HTTP or by Websockets.</p> +<p>Developers may also take advantage of powerful server side plugins to improve +application behavior. Server side plugins return an application/json mine-type +and can be accessed though either HTTP or Websockets.</p> -<p>In a near future, the JSON-RPC protocol will be available together -with the current x-afb-json1 protocol.</p> +<p>In a near future, JSON-RPC protocol should be added to complete current x-afb-json1 protocol.</p> <p>Two examples of HTML5 applications are given:</p> <ul> -<li><p><a href="https://github.com/iotbzh/afb-client">afb-client</a> a simple “hello world” application</p></li> -<li><p><a href="https://github.com/iotbzh/afm-client">afm-client</a> a simple “Home screen” application</p></li> +<li><p><a href="https://github.com/iotbzh/afb-client">afb-client</a> a simple “hello world” application template</p></li> +<li><p><a href="https://github.com/iotbzh/afm-client">afm-client</a> a simple “Home screen” application template</p></li> </ul> <a name="Writing.a.Qt.application"></a> <h3>Writing a Qt application</h3> -<p>Writing Qt applications is also possible because Qt offers APIs to -make HTTP queries and to connect using WebSockets.</p> +<p>Writing Qt applications is also supported. Qt offers standard API to send request through HTTP or WebSockets.</p> -<p>It is even possible to write a QML application. -It is demontrated by the sample application token-websock:</p> +<p>It is also possible to write QML applications. A sample QML application [token-websock] is avaliable..</p> <ul> <li><a href="https://github.com/iotbzh/afb-daemon/blob/master/test/token-websock.qml">token-websock</a> @@ -95,38 +92,37 @@ a simple “hello world” application in QML</li> </ul> -<a name="Writing.a.C.application"></a> -<h3>Writing a C application</h3> +<a name="Writing..C..application"></a> +<h3>Writing “C” application</h3> -<p>C applications can use the binder afb-daemon through a websocket connection.</p> +<p>C applications can use afb-daemon binder through a websocket connection.</p> -<p>The library <strong>libafbwsc</strong> is made for C clients that want -to connect to the afb-daemon binder.</p> +<p>The library <strong>libafbwsc</strong> is provided for C clients that need +to connect with an afb-daemon binder.</p> -<p>The program <strong>afb-client-demo</strong> is the C program that use -the provided library <strong>libafbwsc</strong>. -Its source code is here +<p>The program <strong>afb-client-demo</strong> is the C example that use +<strong>libafbwsc</strong> library. +Source code is available here <a href="https://github.com/iotbzh/afb-daemon/blob/master/src/afb-client-demo.c">src/afb-client-demo.c</a>.</p> -<p>The current implementation use libsystemd and file descriptors. -This may be changed in the future to also support secure sockets -and being less dependant of libsystemd.</p> +<p>Current implementation relies on libsystemd and file descriptors. +This model might be review in the future to support secure sockets +and free the dependency with libsystemd.</p> <a name="Handling.sessions.within.applications"></a> <h2>Handling sessions within applications</h2> -<p>Applications must be aware of the the features session and token -when they interact with the binder afb-daemon.</p> +<p>Applications should understand sessions and tokens management when interacting with afb-daemon binder.</p> -<p>Applications are communicating with their binder afb-daemon using -a network connection or a kind of network connection (unix domain -socket isn’t currently implemented but could be used in near future). -Also, HTTP protocol is not a connected protocol. It means that -the socket connection can not be used to authenticate a client.</p> +<p>Applications are communicating with their private binder(afb-daemon) using +a network connection or potentially any other connection channel. While current version +does not yet implement unix domain this feature might be added in a near future. +Developers need to be warn that HTTP protocol is a none connected protocol. This prevents +from using HTTP socket connection to authenticate clients.</p> <p>For this reason, the binder should authenticate the application -by using a commonly shared secret named token and the identification -of the client named session.</p> +by using a shared secret. The secret is named “token” and the identification +of client is named “session”.</p> <p>The examples <strong>token-websock.qml</strong> and <strong>afb-client</strong> are demonstrating how authentication and sessions are managed.</p> @@ -134,42 +130,41 @@ how authentication and sessions are managed.</p> <a name="Handling.sessions"></a> <h3>Handling sessions</h3> -<p>Plugins and features of the binder need to keep track of the client -instances. This of importance for plugins running as service -because they may have to separate the data of each client.</p> +<p>Plugins and other binder feature need to keep track of client +instances. This is especially important for plugins running as services +as they may typically have to keep each client’s data separated.</p> <p>For HTML5 applications, the web runtime handles the cookie of session that the binder afb-daemon automatically sets.</p> -<p>In any case, the session identifier can be set using the parameters -<strong>uuid</strong> or <strong>x-afb-uuid</strong> in the request uri. That is understood -by HTTP requests and by the negociation of websockets.</p> +<p>Session identifier can be set using the parameter +<strong>uuid</strong> or <strong>x-afb-uuid</strong> in URI requests. Within current version of the +framework session UUID is supported by both HTTP requests and websocket negotiation.</p> <a name="Exchanging.tokens"></a> <h3>Exchanging tokens</h3> -<p>At start, the framework communicates a common secret to both the binder -and its client: the application. This initial secret is the -initial token.</p> +<p>At application start, AGL framework communicates a shared secret to both binder +and client application. This initial secret is called the “initial token”.</p> <p>For each of its client application, the binder manages a current active -token for the session. This authentication token can be a requirement for -accessing some methods.</p> +token for session management. This authentication token can be use to restrict +access to some plugin’s methods.</p> -<p>The token must be passed in the request uri on HTTP or at connecting -websockets using the parameter <strong>token</strong> or <strong>x-afb-token</strong>.</p> +<p>The token must be included in URI request on HTTP or during websockets +connection using parameter <strong>token</strong> or <strong>x-afb-token</strong>.</p> <p>To ensure security, tokens must be refreshed periodically.</p> <a name="Example.of.session.management"></a> <h3>Example of session management</h3> -<p>For the following exmples, we suppose that you launched <strong>afb-daemon</strong> like that or similar:</p> +<p>In following examples, we suppose that <strong>afb-daemon</strong> is launched with something equivalent to:</p> <pre><code>$ afb-daemon --port=1234 --token=123456 [...] </code></pre> -<p>with the expectation that the plugin <strong>AuthLogin</strong> is loaded.</p> +<p>making the expectation that <strong>AuthLogin</strong> plugin is requested as default.</p> <a name="Using.curl"></a> <h4>Using curl</h4> @@ -188,10 +183,10 @@ websockets using the parameter <strong>token</strong> or <strong>x-afb-token</st } </code></pre> -<p>It returns an answer containing the uuid of the session, 850c4594-1be1-4e9b-9fcc-38cc3e6ff015, -and the refreshed token, 850c4594-1be1-4e9b-9fcc-38cc3e6ff015.</p> +<p>It returns an answer containing session UUID, 850c4594-1be1-4e9b-9fcc-38cc3e6ff015, +and a refreshed token, 850c4594-1be1-4e9b-9fcc-38cc3e6ff015.</p> -<p>Let check that it is available:</p> +<p>Check if session and token is valid:</p> <pre><code>$ curl http://localhost:1234/api/auth/check?token=0aef6841-2ddd-436d-b961-ae78da3b5c5f&uuid=850c4594-1be1-4e9b-9fcc-38cc3e6ff015 { @@ -201,7 +196,7 @@ and the refreshed token, 850c4594-1be1-4e9b-9fcc-38cc3e6ff015.</p> } </code></pre> -<p>It works! So try now to refresh the token:</p> +<p>Refresh the token:</p> <pre><code>$ curl http://localhost:1234/api/auth/refresh?token=0aef6841-2ddd-436d-b961-ae78da3b5c5f&uuid=850c4594-1be1-4e9b-9fcc-38cc3e6ff015 { @@ -214,7 +209,7 @@ and the refreshed token, 850c4594-1be1-4e9b-9fcc-38cc3e6ff015.</p> } </code></pre> -<p>Let now close the session:</p> +<p>Close the session:</p> <pre><code>curl http://localhost:1234/api/auth/logout?token=b8ec3ec3-6ffe-448c-9a6c-efda69ad7bd9&uuid=850c4594-1be1-4e9b-9fcc-38cc3e6ff015 { @@ -224,7 +219,7 @@ and the refreshed token, 850c4594-1be1-4e9b-9fcc-38cc3e6ff015.</p> } </code></pre> -<p>So now, checking for the uuid will be refused:</p> +<p>Checking on closed session for uuid should be refused:</p> <pre><code>curl http://localhost:1234/api/auth/check?token=b8ec3ec3-6ffe-448c-9a6c-efda69ad7bd9&uuid=850c4594-1be1-4e9b-9fcc-38cc3e6ff015 { @@ -258,13 +253,13 @@ ON-REPLY 6:auth/refresh: {"jtype":"afb-reply","request":{"status":"success", "token":"e83b36f8-d945-463d-b983-5d8ed73ba529"},"response":{"token":"Token was refreshed"}} </code></pre> -<p>Then you leave. And can reconnect as below:</p> +<p>After closing connection, reconnect as here after:</p> <pre><code>$ afb-client-demo ws://localhost:1234/api?token=e83b36f8-d945-463d-b983-5d8ed73ba529&uuid=5fcc3f3d-4b84-4fc7-ba66-2d8bd34ae7d1 auth check ON-REPLY 1:auth/check: {"jtype":"afb-reply","request":{"status":"success"},"response":{"isvalid":true}} </code></pre> -<p>The same can be continued using <strong>curl</strong>:</p> +<p>Same connection check using <strong>curl</strong>:</p> <pre><code>$ curl http://localhost:1234/api/auth/check?token=e83b36f8-d945-463d-b983-5d8ed73ba529&uuid=5fcc3f3d-4b84-4fc7-ba66-2d8bd34ae7d1 {"jtype":"afb-reply","request":{"status":"success"},"response":{"isvalid":true}} @@ -273,21 +268,21 @@ ON-REPLY 1:auth/check: {"jtype":"afb-reply","request":{"status":"success"},"resp <a name="Format.of.replies"></a> <h2>Format of replies</h2> -<p>The replies are made of one javascript object returned using JSON serialization.</p> +<p>Replies use javascript object returned as serialized JSON.</p> -<p>This object containts at least 2 mandatory fields of name <strong>jtype</strong> and <strong>request</strong> -and an optionnal field of name <strong>response</strong>.</p> +<p>This object contains at least 2 mandatory fields of name <strong>jtype</strong> and <strong>request</strong> +and one optional field of name <strong>response</strong>.</p> <a name="Field.jtype"></a> <h3>Field jtype</h3> -<p>The field <strong>jtype</strong> must have a value of type string equel to <strong>“afb-reply”</strong>.</p> +<p>The field <strong>jtype</strong> must have a value of type string equal to <strong>“afb-reply”</strong>.</p> <a name="Field.request"></a> <h3>Field request</h3> <p>The field <strong>request</strong> must have a value of type object. This request object -has at least one field named <strong>status</strong> and four optionnal fields of name +has at least one field named <strong>status</strong> and four optional fields named <strong>info</strong>, <strong>token</strong>, <strong>uuid</strong>, <strong>reqid</strong>.</p> <a name="Subfield.request.status"></a> @@ -299,30 +294,30 @@ only in case of success.</p> <a name="Subfield.request.info"></a> <h4>Subfield request.info</h4> -<p><strong>info</strong> is of type string and represent optionnal the information added to the reply.</p> +<p><strong>info</strong> is of type string and represent optional information added to the reply.</p> <a name="Subfield.request.token"></a> <h4>Subfield request.token</h4> -<p><strong>token</strong> is of type string. It is sent either on the creation of the -session or when the token is refreshed.</p> +<p><strong>token</strong> is of type string. It is sent either at session creation +or when the token is refreshed.</p> <a name="Subfield.request.uuid"></a> <h4>Subfield request.uuid</h4> -<p><strong>uuid</strong> is of type string. It is sent on the creation of the session.</p> +<p><strong>uuid</strong> is of type string. It is sent at session creation.</p> <a name="Subfield.request.reqid"></a> <h4>Subfield request.reqid</h4> -<p><strong>reqid</strong> is of type string. It is sent in response of HTTP requests -that added a parameter of name <strong>reqid</strong> or <strong>x-afb-reqid</strong>. The value -sent in the reply is the exact value received on the request.</p> +<p><strong>reqid</strong> is of type string. It is sent in response to HTTP requests +that added a parameter of name <strong>reqid</strong> or <strong>x-afb-reqid</strong> at request time. +Value returns in the reply has the exact same value as the one received in the request.</p> <a name="Field.response"></a> <h3>Field response</h3> -<p>This field response optionnaly containts the object returned with successful replies.</p> +<p>This field response optionally contains an object returned when request succeeded.</p> <a name="Template"></a> <h3>Template</h3> |