vocabulary: moving from 'plugin' to 'binding'

Change-Id: Ic9e118df2bede1fefbb591f8ae7887266b7324ca
Signed-off-by: José Bollo <jose.bollo@iot.bzh>

7 files changed, 1337 insertions, 0 deletions

diff --git a/bindings/samples/AuthLogin.c b/bindings/samples/AuthLogin.c
new file mode 100644
index 00000000..efecf240
--- /dev/null
+++ b/bindings/samples/AuthLogin.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (C) 2015, 2016 "IoT.bzh"
+ * Author "Fulup Ar Foll"
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <json-c/json.h>
+
+#include <afb/afb-plugin.h>
+
+// Dummy sample of Client Application Context
+typedef struct {
+  int  something;       
+  void *whateveryouwant;
+} MyClientApplicationHandle;
+
+
+// This function is call when Client Session Context is removed
+// Note: when freeCtxCB==NULL standard free/malloc is called
+static void clientContextFree(void *context) {
+    fprintf (stderr,"Plugin[token] Closing Session\n");
+    free (context);
+}
+
+// Request Creation of new context if it does not exist
+static void clientContextConnect (struct afb_req request)
+{
+    json_object *jresp;
+
+    // add an application specific client context to session
+    afb_req_context_set(request, malloc (sizeof (MyClientApplicationHandle)), clientContextFree);
+
+    // do something intelligent to check if we should or not update level of assurance from 0(anonymous) to 1(logged)
+    afb_req_session_set_LOA(request, 1);
+    
+    // Send response to UI
+    jresp = json_object_new_object();               
+    json_object_object_add(jresp, "token", json_object_new_string ("A New Token and Session Context Was Created"));
+
+    afb_req_success(request, jresp, NULL);
+    
+}
+
+// Before entering here token will be check and renew
+static void clientContextRefresh (struct afb_req request) {
+    json_object *jresp;
+
+  
+    jresp = json_object_new_object();
+    json_object_object_add(jresp, "token", json_object_new_string ("Token was refreshed"));              
+    
+    afb_req_success(request, jresp, NULL);
+}
+
+
+// Session token will we verified before entering here
+static void clientContextCheck (struct afb_req request) {
+    
+    json_object *jresp = json_object_new_object();    
+    json_object_object_add(jresp, "isvalid", json_object_new_boolean (TRUE));       
+        
+    afb_req_success(request, jresp, NULL);
+}
+
+
+// Close and Free context
+static void clientContextLogout (struct afb_req request) {
+    json_object *jresp;
+   
+    /* after this call token will be reset
+     *  - no further access to API will be possible 
+     *  - every context from any used plugin will be freed
+     */
+    
+    jresp = json_object_new_object();
+    json_object_object_add(jresp, "info", json_object_new_string ("Token and all resources are released"));
+    
+    // WARNING: if you free context resource manually here do not forget to set *request.context=NULL; 
+    afb_req_success(request, jresp, NULL);
+    
+    afb_req_session_set_LOA(request, 0);
+}
+// Close and Free context
+static void clientGetPing (struct afb_req request) {
+    static int count=0;
+    json_object *jresp;
+
+    jresp = json_object_new_object();
+    json_object_object_add(jresp, "count", json_object_new_int (count ++));
+    
+    afb_req_success(request, jresp, NULL);
+}
+
+
+static const struct AFB_verb_desc_v1 verbs[]= {
+  {"ping"    , AFB_SESSION_NONE                        , clientGetPing       ,"Ping Rest Test Service"},
+  {"connect" , AFB_SESSION_LOA_EQ_0 | AFB_SESSION_RENEW, clientContextConnect,"Connect/Login Client"},
+  {"refresh" , AFB_SESSION_LOA_GE_1 | AFB_SESSION_RENEW, clientContextRefresh,"Refresh Client Authentication Token"},
+  {"check"   , AFB_SESSION_LOA_GE_1                    , clientContextCheck  ,"Check Client Authentication Token"},
+  {"logout"  , AFB_SESSION_LOA_GE_1 | AFB_SESSION_CLOSE, clientContextLogout ,"Logout Client and Free resources"},
+  {NULL}
+};
+
+static const struct AFB_plugin plugin_desc = {
+	.type = AFB_PLUGIN_VERSION_1,
+	.v1 = {
+		.info = "Application Framework Binder Authentication sample",
+		.prefix = "auth",
+		.verbs = verbs
+	}
+};
+
+const struct AFB_plugin *pluginAfbV1Register (const struct AFB_interface *itf)
+{
+	return &plugin_desc;
+}
diff --git a/bindings/samples/CMakeLists.txt b/bindings/samples/CMakeLists.txt
new file mode 100644
index 00000000..59a9a449
--- /dev/null
+++ b/bindings/samples/CMakeLists.txt
@@ -0,0 +1,63 @@
+
+INCLUDE_DIRECTORIES(${include_dirs})
+
+##################################################
+# AuthLogin
+##################################################
+ADD_LIBRARY(authLogin MODULE AuthLogin.c)
+SET_TARGET_PROPERTIES(authLogin PROPERTIES
+	PREFIX ""
+	LINK_FLAGS "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/export.map"
+)
+TARGET_LINK_LIBRARIES(authLogin ${link_libraries})
+INSTALL(TARGETS authLogin
+        LIBRARY DESTINATION ${binding_install_dir})
+
+##################################################
+# DemoContext
+##################################################
+ADD_LIBRARY(demoContext MODULE DemoContext.c)
+SET_TARGET_PROPERTIES(demoContext PROPERTIES
+	PREFIX ""
+	LINK_FLAGS "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/export.map"
+)
+TARGET_LINK_LIBRARIES(demoContext ${link_libraries})
+INSTALL(TARGETS demoContext
+        LIBRARY DESTINATION ${binding_install_dir})
+
+##################################################
+# DemoPost
+##################################################
+ADD_LIBRARY(demoPost MODULE DemoPost.c)
+SET_TARGET_PROPERTIES(demoPost PROPERTIES
+	PREFIX ""
+	LINK_FLAGS "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/export.map"
+)
+TARGET_LINK_LIBRARIES(demoPost ${link_libraries})
+INSTALL(TARGETS demoPost
+        LIBRARY DESTINATION ${binding_install_dir})
+
+##################################################
+# HelloWorld
+##################################################
+ADD_LIBRARY(helloWorld MODULE HelloWorld.c)
+SET_TARGET_PROPERTIES(helloWorld PROPERTIES
+	PREFIX ""
+	LINK_FLAGS "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/export.map"
+)
+TARGET_LINK_LIBRARIES(helloWorld ${link_libraries})
+INSTALL(TARGETS helloWorld
+        LIBRARY DESTINATION ${binding_install_dir})
+
+##################################################
+# tic-tac-toe
+##################################################
+ADD_LIBRARY(tic-tac-toe MODULE tic-tac-toe.c)
+SET_TARGET_PROPERTIES(tic-tac-toe PROPERTIES
+	PREFIX ""
+	LINK_FLAGS "-Wl,--version-script=${CMAKE_CURRENT_SOURCE_DIR}/export.map"
+)
+TARGET_LINK_LIBRARIES(tic-tac-toe ${link_libraries})
+INSTALL(TARGETS tic-tac-toe
+        LIBRARY DESTINATION ${binding_install_dir})
+
diff --git a/bindings/samples/DemoContext.c b/bindings/samples/DemoContext.c
new file mode 100644
index 00000000..ef703759
--- /dev/null
+++ b/bindings/samples/DemoContext.c
@@ -0,0 +1,160 @@
+/*
+ * Copyright (C) 2015, 2016 "IoT.bzh"
+ * Author "Fulup Ar Foll"
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <json-c/json.h>
+
+#include <afb/afb-plugin.h>
+
+typedef struct {
+  /* 
+   * client context is attached a session but private to a each plugin.
+   * Context is passed to each API under request->context
+   * 
+   * Note:
+   *  -client context is free when a session is closed. Developer should not
+   *   forget that even if context is private to each plugin, session is unique
+   *   to a client. When session close, every plugin are notified to free there
+   *   private context.
+   *  -by default standard "free" function from libc is used to free context.
+   *   Developer may define it own under plugin->freeCB. This call received
+   *   FreeCtxCb(void *ClientCtx, void*PluginHandle, char*SessionUUID) if
+   *   FreeCtxCb=(void*)-1 then context wont be free by session manager.
+   *  -when an API use AFB_SESSION_RESET this close the session and each plugin
+   *   will be notified to free ressources.
+   */
+    
+  int  count;
+  char *abcd;
+  
+} MyClientContextT;
+
+// This function is call at session open time. Any client trying to 
+// call it with an already open session will be denied.
+// Ex: http://localhost:1234/api/context/create?token=123456789
+static void myCreate (struct afb_req request)
+{
+    MyClientContextT *ctx = malloc (sizeof (MyClientContextT));
+
+    // store something in our plugin private client context
+    ctx->count = 0;
+    ctx->abcd  = "SomeThingUseful";        
+
+    afb_req_context_set(request, ctx, free);
+    afb_req_success_f(request, NULL, "SUCCESS: create client context for plugin [%s]", ctx->abcd);
+}
+
+// This function can only be called with a valid token. Token should be renew before
+// session timeout a standard renew api is avaliable at /api/token/renew this API
+// can be called automatically with <token-renew> HTML5 widget.
+// ex: http://localhost:1234/api/context/action?token=xxxxxx-xxxxxx-xxxxx-xxxxx-xxxxxx
+static void myAction (struct afb_req request)
+{
+    MyClientContextT *ctx = (MyClientContextT*) afb_req_context_get(request);
+    
+    // store something in our plugin private client context
+    ctx->count++;
+    afb_req_success_f(request, NULL, "SUCCESS: plugin [%s] Check=[%d]\n", ctx->abcd, ctx->count);
+}
+
+// After execution of this function, client session will be close and if they
+// created a context [request->context != NULL] every plugins will be notified
+// that they should free context resources.
+// ex: http://localhost:1234/api/context/close?token=xxxxxx-xxxxxx-xxxxx-xxxxx-xxxxxx
+static void myClose (struct afb_req request)
+{
+    MyClientContextT *ctx = (MyClientContextT*) afb_req_context_get(request);
+    
+    // store something in our plugin private client context
+    ctx->count++;
+    afb_req_success_f(request, NULL, "SUCCESS: plugin [%s] Close=[%d]\n", ctx->abcd, ctx->count);
+}
+
+// Set the LOA
+static void setLOA(struct afb_req request, unsigned loa)
+{
+    if (afb_req_session_set_LOA(request, loa))
+	afb_req_success_f(request, NULL, "loa set to %u", loa);
+    else
+	afb_req_fail_f(request, "failed", "can't set loa to %u", loa);
+}
+
+static void clientSetLOA0(struct afb_req request)
+{
+    setLOA(request, 0);
+}
+
+static void clientSetLOA1(struct afb_req request)
+{
+    setLOA(request, 1);
+}
+
+static void clientSetLOA2(struct afb_req request)
+{
+    setLOA(request, 2);
+}
+
+static void clientSetLOA3(struct afb_req request)
+{
+    setLOA(request, 3);
+}
+
+static void clientCheckLOA(struct afb_req request)
+{
+    afb_req_success(request, NULL, "LOA checked and okay");
+}
+
+// NOTE: this sample does not use session to keep test a basic as possible
+//       in real application most APIs should be protected with AFB_SESSION_CHECK
+static const struct AFB_verb_desc_v1 verbs[]= {
+  {"create", AFB_SESSION_CREATE, myCreate  , "Create a new session"},
+  {"action", AFB_SESSION_CHECK , myAction  , "Use Session Context"},
+  {"close" , AFB_SESSION_CLOSE , myClose   , "Free Context"},
+  {"set_loa_0", AFB_SESSION_RENEW, clientSetLOA0       ,"Set level of assurance to 0"},
+  {"set_loa_1", AFB_SESSION_RENEW, clientSetLOA1       ,"Set level of assurance to 1"},
+  {"set_loa_2", AFB_SESSION_RENEW, clientSetLOA2       ,"Set level of assurance to 2"},
+  {"set_loa_3", AFB_SESSION_RENEW, clientSetLOA3       ,"Set level of assurance to 3"},
+  {"check_loa_ge_0", AFB_SESSION_LOA_GE_0, clientCheckLOA ,"Check whether level of assurance is greater or equal to 0"},
+  {"check_loa_ge_1", AFB_SESSION_LOA_GE_1, clientCheckLOA ,"Check whether level of assurance is greater or equal to 1"},
+  {"check_loa_ge_2", AFB_SESSION_LOA_GE_2, clientCheckLOA ,"Check whether level of assurance is greater or equal to 2"},
+  {"check_loa_ge_3", AFB_SESSION_LOA_GE_3, clientCheckLOA ,"Check whether level of assurance is greater or equal to 3"},
+  {"check_loa_le_0", AFB_SESSION_LOA_LE_0, clientCheckLOA ,"Check whether level of assurance is lesser or equal to 0"},
+  {"check_loa_le_1", AFB_SESSION_LOA_LE_1, clientCheckLOA ,"Check whether level of assurance is lesser or equal to 1"},
+  {"check_loa_le_2", AFB_SESSION_LOA_LE_2, clientCheckLOA ,"Check whether level of assurance is lesser or equal to 2"},
+  {"check_loa_le_3", AFB_SESSION_LOA_LE_3, clientCheckLOA ,"Check whether level of assurance is lesser or equal to 3"},
+  {"check_loa_eq_0", AFB_SESSION_LOA_EQ_0, clientCheckLOA ,"Check whether level of assurance is equal to 0"},
+  {"check_loa_eq_1", AFB_SESSION_LOA_EQ_1, clientCheckLOA ,"Check whether level of assurance is equal to 1"},
+  {"check_loa_eq_2", AFB_SESSION_LOA_EQ_2, clientCheckLOA ,"Check whether level of assurance is equal to 2"},
+  {"check_loa_eq_3", AFB_SESSION_LOA_EQ_3, clientCheckLOA ,"Check whether level of assurance is equal to 3"},
+  {NULL}
+};
+
+static const struct AFB_plugin plugin_desc = {
+	.type = AFB_PLUGIN_VERSION_1,
+	.v1 = {
+		.info = "Sample of Client Context Usage",
+		.prefix = "context",
+		.verbs = verbs,
+	}
+};
+
+const struct AFB_plugin *pluginAfbV1Register (const struct AFB_interface *itf)
+{
+	return &plugin_desc;
+}
+
diff --git a/bindings/samples/DemoPost.c b/bindings/samples/DemoPost.c
new file mode 100644
index 00000000..b61b91c4
--- /dev/null
+++ b/bindings/samples/DemoPost.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2015, 2016 "IoT.bzh"
+ * Author "Fulup Ar Foll"
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <string.h>
+#include <json-c/json.h>
+
+#include <afb/afb-plugin.h>
+
+
+// Sample Generic Ping Debug API
+static void getPingTest(struct afb_req request)
+{
+    static int pingcount = 0;
+    json_object *query = afb_req_json(request);
+
+    afb_req_success_f(request, query, "Ping Binder Daemon count=%d", ++pingcount);
+}
+
+// With content-type=json data are directly avaliable in request->post->data
+static void GetJsonByPost (struct afb_req request)
+{
+    struct afb_arg arg;
+    json_object* jresp;
+    json_object *query = afb_req_json(request);
+
+    arg = afb_req_get(request, "");
+    jresp = arg.value ? json_tokener_parse(arg.value) : NULL;
+    afb_req_success_f(request, jresp, "GetJsonByPost query={%s}", json_object_to_json_string(query));
+}
+
+// Upload a file and execute a function when upload is done
+static void Uploads (struct afb_req request, const char *destination)
+{
+   struct afb_arg a = afb_req_get(request, "file");
+   if (a.value == NULL || *a.value == 0)
+     afb_req_fail(request, "failed", "no file selected");
+   else
+     afb_req_success_f(request, NULL, "uploaded file %s of path %s for destination %s", a.value, a.path, destination);
+}
+
+// Upload a file and execute a function when upload is done
+static void UploadAppli (struct afb_req request)
+{
+    Uploads(request, "applications");
+}
+
+// Simples Upload case just upload a file
+static void UploadMusic (struct afb_req request)
+{
+    Uploads(request, "musics");
+}
+
+// PostForm callback is called multiple times (one or each key within form, or once per file buffer)
+// When file has been fully uploaded call is call with item==NULL 
+static void UploadImage (struct afb_req request)
+{
+    Uploads(request, "images");
+}
+
+
+// NOTE: this sample does not use session to keep test a basic as possible
+//       in real application upload-xxx should be protected with AFB_SESSION_CHECK
+static const struct AFB_verb_desc_v1 verbs[]= {
+  {"ping"         , AFB_SESSION_NONE  , getPingTest    ,"Ping Rest Test Service"},
+  {"upload-json"  , AFB_SESSION_NONE  , GetJsonByPost  ,"Demo for Json Buffer on Post"},
+  {"upload-image" , AFB_SESSION_NONE  , UploadImage    ,"Demo for file upload"},
+  {"upload-music" , AFB_SESSION_NONE  , UploadMusic    ,"Demo for file upload"},
+  {"upload-appli" , AFB_SESSION_NONE  , UploadAppli    ,"Demo for file upload"},
+  {NULL}
+};
+
+static const struct AFB_plugin plugin_desc = {
+	.type = AFB_PLUGIN_VERSION_1,
+	.v1 = {
+		.info = "Sample with Post Upload Files",
+		.prefix = "post",
+		.verbs = verbs
+	}
+};
+
+const struct AFB_plugin *pluginAfbV1Register (const struct AFB_interface *itf)
+{
+    return &plugin_desc;
+};
diff --git a/bindings/samples/HelloWorld.c b/bindings/samples/HelloWorld.c
new file mode 100644
index 00000000..b6f49b78
--- /dev/null
+++ b/bindings/samples/HelloWorld.c
@@ -0,0 +1,279 @@
+/*
+ * Copyright (C) 2015, 2016 "IoT.bzh"
+ * Author "Fulup Ar Foll"
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <string.h>
+#include <json-c/json.h>
+
+#include <afb/afb-plugin.h>
+
+const struct AFB_interface *interface;
+
+struct event
+{
+	struct event *next;
+	struct afb_event event;
+	char tag[1];
+};
+
+static struct event *events = 0;
+
+/* searchs the event of tag */
+static struct event *event_get(const char *tag)
+{
+	struct event *e = events;
+	while(e && strcmp(e->tag, tag))
+		e = e->next;
+	return e;
+}
+
+/* deletes the event of tag */
+static int event_del(const char *tag)
+{
+	struct event *e, **p;
+
+	/* check exists */
+	e = event_get(tag);
+	if (!e) return -1;
+
+	/* unlink */
+	p = &events;
+	while(*p != e) p = &(*p)->next;
+	*p = e->next;
+
+	/* destroys */
+	afb_event_drop(e->event);
+	free(e);
+	return 0;
+}
+
+/* creates the event of tag */
+static int event_add(const char *tag, const char *name)
+{
+	struct event *e;
+
+	/* check valid tag */
+	e = event_get(tag);
+	if (e) return -1;
+
+	/* creation */
+	e = malloc(strlen(tag) + sizeof *e);
+	if (!e) return -1;
+	strcpy(e->tag, tag);
+
+	/* make the event */
+	e->event = afb_daemon_make_event(interface->daemon, name);
+	if (!e->event.closure) { free(e); return -1; }
+
+	/* link */
+	e->next = events;
+	events = e;
+	return 0;
+}
+
+static int event_subscribe(struct afb_req request, const char *tag)
+{
+	struct event *e;
+	e = event_get(tag);
+	return e ? afb_req_subscribe(request, e->event) : -1;
+}
+
+static int event_unsubscribe(struct afb_req request, const char *tag)
+{
+	struct event *e;
+	e = event_get(tag);
+	return e ? afb_req_unsubscribe(request, e->event) : -1;
+}
+
+static int event_push(struct json_object *args, const char *tag)
+{
+	struct event *e;
+	e = event_get(tag);
+	return e ? afb_event_push(e->event, json_object_get(args)) : -1;
+}
+
+// Sample Generic Ping Debug API
+static void ping(struct afb_req request, json_object *jresp, const char *tag)
+{
+	static int pingcount = 0;
+	json_object *query = afb_req_json(request);
+	afb_req_success_f(request, jresp, "Ping Binder Daemon tag=%s count=%d query=%s", tag, ++pingcount, json_object_to_json_string(query));
+}
+
+static void pingSample (struct afb_req request)
+{
+	ping(request, json_object_new_string ("Some String"), "pingSample");
+}
+
+static void pingFail (struct afb_req request)
+{
+	afb_req_fail(request, "failed", "Ping Binder Daemon fails");
+}
+
+static void pingNull (struct afb_req request)
+{
+	ping(request, NULL, "pingNull");
+}
+
+static void pingBug (struct afb_req request)
+{
+	ping((struct afb_req){NULL,NULL,NULL}, NULL, "pingBug");
+}
+
+static void pingEvent(struct afb_req request)
+{
+	json_object *query = afb_req_json(request);
+	afb_daemon_broadcast_event(interface->daemon, "event", json_object_get(query));
+	ping(request, json_object_get(query), "event");
+}
+
+
+// For samples https://linuxprograms.wordpress.com/2010/05/20/json-c-libjson-tutorial/
+static void pingJson (struct afb_req request) {
+    json_object *jresp, *embed;    
+    
+    jresp = json_object_new_object();
+    json_object_object_add(jresp, "myString", json_object_new_string ("Some String"));
+    json_object_object_add(jresp, "myInt", json_object_new_int (1234));
+     
+    embed  = json_object_new_object();
+    json_object_object_add(embed, "subObjString", json_object_new_string ("Some String"));
+    json_object_object_add(embed, "subObjInt", json_object_new_int (5678));
+    
+    json_object_object_add(jresp,"eobj", embed);
+
+    ping(request, jresp, "pingJson");
+}
+
+static void subcallcb (void *prequest, int iserror, json_object *object)
+{
+	struct afb_req request = afb_req_unstore(prequest);
+	if (iserror)
+		afb_req_fail(request, "failed", json_object_to_json_string(object));
+	else
+		afb_req_success(request, object, NULL);
+	afb_req_unref(request);
+}
+
+static void subcall (struct afb_req request)
+{
+	const char *api = afb_req_value(request, "api");
+	const char *verb = afb_req_value(request, "verb");
+	const char *args = afb_req_value(request, "args");
+	json_object *object = api && verb && args ? json_tokener_parse(args) : NULL;
+
+	if (object == NULL)
+		afb_req_fail(request, "failed", "bad arguments");
+	else
+		afb_req_subcall(request, api, verb, object, subcallcb, afb_req_store(request));
+}
+
+static void eventadd (struct afb_req request)
+{
+	const char *tag = afb_req_value(request, "tag");
+	const char *name = afb_req_value(request, "name");
+
+	if (tag == NULL || name == NULL)
+		afb_req_fail(request, "failed", "bad arguments");
+	else if (0 != event_add(tag, name))
+		afb_req_fail(request, "failed", "creation error");
+	else
+		afb_req_success(request, NULL, NULL);
+}
+
+static void eventdel (struct afb_req request)
+{
+	const char *tag = afb_req_value(request, "tag");
+
+	if (tag == NULL)
+		afb_req_fail(request, "failed", "bad arguments");
+	else if (0 != event_del(tag))
+		afb_req_fail(request, "failed", "deletion error");
+	else
+		afb_req_success(request, NULL, NULL);
+}
+
+static void eventsub (struct afb_req request)
+{
+	const char *tag = afb_req_value(request, "tag");
+
+	if (tag == NULL)
+		afb_req_fail(request, "failed", "bad arguments");
+	else if (0 != event_subscribe(request, tag))
+		afb_req_fail(request, "failed", "subscription error");
+	else
+		afb_req_success(request, NULL, NULL);
+}
+
+static void eventunsub (struct afb_req request)
+{
+	const char *tag = afb_req_value(request, "tag");
+
+	if (tag == NULL)
+		afb_req_fail(request, "failed", "bad arguments");
+	else if (0 != event_unsubscribe(request, tag))
+		afb_req_fail(request, "failed", "unsubscription error");
+	else
+		afb_req_success(request, NULL, NULL);
+}
+
+static void eventpush (struct afb_req request)
+{
+	const char *tag = afb_req_value(request, "tag");
+	const char *data = afb_req_value(request, "data");
+	json_object *object = data ? json_tokener_parse(data) : NULL;
+
+	if (tag == NULL)
+		afb_req_fail(request, "failed", "bad arguments");
+	else if (0 > event_push(object, tag))
+		afb_req_fail(request, "failed", "push error");
+	else
+		afb_req_success(request, NULL, NULL);
+}
+
+// NOTE: this sample does not use session to keep test a basic as possible
+//       in real application most APIs should be protected with AFB_SESSION_CHECK
+static const struct AFB_verb_desc_v1 verbs[]= {
+  {"ping"     , AFB_SESSION_NONE, pingSample  , "Ping Application Framework"},
+  {"pingfail" , AFB_SESSION_NONE, pingFail    , "Fails"},
+  {"pingnull" , AFB_SESSION_NONE, pingNull    , "Return NULL"},
+  {"pingbug"  , AFB_SESSION_NONE, pingBug     , "Do a Memory Violation"},
+  {"pingJson" , AFB_SESSION_NONE, pingJson    , "Return a JSON object"},
+  {"pingevent", AFB_SESSION_NONE, pingEvent   , "Send an event"},
+  {"subcall",   AFB_SESSION_NONE, subcall     , "Call api/verb(args)"},
+  {"eventadd",  AFB_SESSION_NONE, eventadd    , "adds the event of 'name' for the 'tag'"},
+  {"eventdel",  AFB_SESSION_NONE, eventdel    , "deletes the event of 'tag'"},
+  {"eventsub",  AFB_SESSION_NONE, eventsub    , "subscribes to the event of 'tag'"},
+  {"eventunsub",AFB_SESSION_NONE, eventunsub  , "unsubscribes to the event of 'tag'"},
+  {"eventpush", AFB_SESSION_NONE, eventpush   , "pushs the event of 'tag' with the 'data'"},
+  {NULL}
+};
+
+static const struct AFB_plugin plugin_desc = {
+	.type = AFB_PLUGIN_VERSION_1,
+	.v1 = {
+		.info = "Minimal Hello World Sample",
+		.prefix = "hello",
+		.verbs = verbs
+	}
+};
+
+const struct AFB_plugin *pluginAfbV1Register (const struct AFB_interface *itf)
+{
+	interface = itf;
+	return &plugin_desc;
+}
diff --git a/bindings/samples/export.map b/bindings/samples/export.map
new file mode 100644
index 00000000..0ef1ac79
--- /dev/null
+++ b/bindings/samples/export.map
@@ -0,0 +1 @@
+{ global: afbBindingV1Register; local: *; };
diff --git a/bindings/samples/tic-tac-toe.c b/bindings/samples/tic-tac-toe.c
new file mode 100644
index 00000000..0100fc05
--- /dev/null
+++ b/bindings/samples/tic-tac-toe.c
@@ -0,0 +1,605 @@
+/*
+ * Copyright (C) 2016 "IoT.bzh"
+ * Author José Bollo <jose.bollo@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <string.h>
+#include <json-c/json.h>
+
+#include <afb/afb-binding.h>
+
+/*
+ * the interface to afb-daemon
+ */
+const struct afb_binding_interface *afbitf;
+
+/*
+ * definition of waiters
+ */
+struct waiter
+{
+	struct waiter *next;
+	struct afb_req req;
+};
+
+/*
+ * definition of a board
+ */
+struct board
+{
+	struct board *next;
+	int use_count;
+	int moves;
+	int history[9];
+	int id;
+	int level;
+	char board[9];
+	struct waiter *waiters;
+};
+
+/*
+ * list of boards
+ */
+static struct board *all_boards;
+
+/*
+ * Searchs a board having the 'id'.
+ * Returns it if found or NULL otherwise.
+ */
+static struct board *search_board(int id)
+{
+	struct board *board = all_boards;
+	while (board != NULL && board->id != id)
+		board = board->next;
+	return board;
+}
+
+/*
+ * Creates a new board and returns it.
+ */
+static struct board *get_new_board()
+{
+	/* allocation */
+	struct board *board = calloc(1, sizeof *board);
+
+	/* initialisation */
+	memset(board->board, ' ', sizeof board->board);
+	board->use_count = 1;
+	board->level = 1;
+	board->moves = 0;
+	do {
+		board->id = (rand() >> 2) % 1000;
+	} while(board->id == 0 || search_board(board->id) != NULL);
+
+	/* link */
+	board->next = all_boards;
+	all_boards = board;
+	return board;
+}
+
+/*
+ * Release a board
+ */
+static void release_board(struct board *board)
+{
+	/* decrease the reference count ... */
+	if (--board->use_count == 0) {
+		/* ... no more use */
+		/* unlink from the list of boards */
+		struct board **prv = &all_boards;
+		while (*prv != NULL && *prv != board)
+			prv = &(*prv)->next;
+		if (*prv != NULL)
+			*prv = board->next;
+		/* release the used memory */
+		free(board);
+	}
+}
+
+/*
+ * Checks who wins
+ * Returns zero if there is no winner
+ * Returns the char of the winner if a player won
+ */
+static char winner(const char b[9])
+{
+	int i;
+	char c;
+
+	/* check diagonals */
+	c = b[4];
+	if (c != ' ') {
+		if (b[0] == c && b[8] == c)
+			return c;
+		if (b[2] == c && b[6] == c)
+			return c;
+	}
+
+	/* check lines */
+	for (i = 0 ; i <= 6 ; i += 3) {
+		c = b[i];
+		if (c != ' ' && b[i+1] == c && b[i+2] == c)
+			return c;
+	}
+
+	/* check columns */
+	for (i = 0 ; i <= 2 ; i++) {
+		c = b[i];
+		if (c != ' ' && b[i+3] == c && b[i+6] == c)
+			return c;
+	}
+
+	return 0;
+}
+
+/* get the color (X or 0) of the move of index 'move' */
+static char color(int move)
+{
+	return (move & 1) == 0 ? 'X' : '0';
+}
+
+/* adds the move to the board */
+static void add_move(struct board *board, int index)
+{
+	int imove = board->moves++;
+	board->history[imove] = index;
+	board->board[index] = color(imove);
+}
+
+/* get a random possible move index from the board described by 'b' */
+static int get_random_move(char b[9])
+{
+	int index = rand() % 9;
+	while (b[index] != ' ')
+		index = (index + 1) % 9;
+	return index;
+}
+
+/*
+ * Scores the position described by 'b'
+ * for the player of color 'c' using an analysis of 'depth'.
+ * Returns 1 if player 'c' will win.
+ * Returns -1 if opponent of player 'c' will win.
+ * returns 0 otherwise.
+ */
+static int score_position(char b[9], char c, int depth)
+{
+	int i, t, r;
+
+	/* check if winner */
+	if (winner(b) == c)
+		return 1;
+
+	/* when depth of analysis is reached return unknown case */
+	if (--depth == 0)
+		return 0;
+
+	/* switch to the opponent */
+	c = (char)('O' + 'X' - c);
+
+	/* inspect opponent moves */
+	r = 1;
+	for (i = 0 ; i < 9 ; i++) {
+		if (b[i] == ' ') {
+			b[i] = c;
+			t = score_position(b, c, depth);
+			b[i] = ' ';
+			if (t > 0)
+				return -1; /* opponent will win */
+
+			if (t == 0)
+				r = 0; /* something not clear */
+		}
+	}
+	return r;
+}
+
+/* get one move: return the computed index of the move */
+static int get_move(struct board *board)
+{
+	int index, depth, t, f;
+	char c;
+	char b[9];
+
+	/* compute the depth */
+	depth = board->level - 1;
+	if (board->moves + depth > 9)
+		depth = 9 - board->moves;
+
+	/* case of null depth */
+	if (depth == 0)
+		return get_random_move(board->board);
+
+	/* depth and more */
+	memcpy(b, board->board, 9);
+	c = color(board->moves);
+	f = 0;
+	for (index = 0 ; index < 9 ; index++) {
+		if (board->board[index] == ' ') {
+			board->board[index] = c;
+			t = score_position(board->board, c, depth);
+			board->board[index] = ' ';
+			if (t > 0)
+				return index;
+			if (t < 0)
+				b[index] = '+';
+			else
+				f = 1;
+		}
+	}
+	return get_random_move(f ? b : board->board);
+}
+
+/*
+ * get the board description
+ */
+static struct json_object *describe(struct board *board)
+{
+	int i;
+	char w;
+	struct json_object *resu, *arr;
+
+	resu = json_object_new_object();
+
+	json_object_object_add(resu, "boardid", json_object_new_int(board->id));
+	json_object_object_add(resu, "level", json_object_new_int(board->level));
+
+	arr = json_object_new_array();
+	json_object_object_add(resu, "board", arr);
+	for (i = 0 ; i < 9 ; i++)
+		json_object_array_add(arr,
+				json_object_new_string_len(&board->board[i], 1));
+
+	arr = json_object_new_array();
+	json_object_object_add(resu, "history", arr);
+	for (i = 0 ; i < board->moves ; i++)
+		json_object_array_add(arr, json_object_new_int(board->history[i]));
+
+	w = winner(board->board);
+	if (w)
+		json_object_object_add(resu, "winner", json_object_new_string_len(&w, 1));
+	else if (board->moves == 9)
+		json_object_object_add(resu, "winner", json_object_new_string("none"));
+
+	return resu;
+}
+
+/*
+ * signals a change of the board
+ */
+static void changed(struct board *board, const char *reason)
+{
+	struct waiter *waiter, *next;
+	struct json_object *description;
+
+	/* get the description */
+	description = describe(board);
+
+	waiter = board->waiters;
+	board->waiters = NULL;
+	while (waiter != NULL) {
+		next = waiter->next;
+		afb_req_success(waiter->req, json_object_get(description), reason);
+		afb_req_unref(waiter->req);
+		free(waiter);
+		waiter = next;
+	}
+
+	afb_daemon_broadcast_event(afbitf->daemon, reason, description);
+}
+
+/*
+ * retrieves the board of the request
+ */
+static inline struct board *board_of_req(struct afb_req req)
+{
+	return afb_req_context(req, (void*)get_new_board, (void*)release_board);
+}
+
+/*
+ * start a new game
+ */
+static void new(struct afb_req req)
+{
+	struct board *board;
+
+	/* retrieves the context for the session */
+	board = board_of_req(req);
+	INFO(afbitf, "method 'new' called for boardid %d", board->id);
+
+	/* reset the game */
+	memset(board->board, ' ', sizeof board->board);
+	board->moves = 0;
+
+	/* replies */
+	afb_req_success(req, NULL, NULL);
+
+	/* signal change */
+	changed(board, "new");
+}
+
+/*
+ * get the board
+ */
+static void board(struct afb_req req)
+{
+	struct board *board;
+	struct json_object *description;
+
+	/* retrieves the context for the session */
+	board = board_of_req(req);
+	INFO(afbitf, "method 'board' called for boardid %d", board->id);
+
+	/* describe the board */
+	description = describe(board);
+
+	/* send the board's description */
+	afb_req_success(req, description, NULL);
+}
+
+/*
+ * move a piece
+ */
+static void move(struct afb_req req)
+{
+	struct board *board;
+	int i;
+	const char *index;
+
+	/* retrieves the context for the session */
+	board = board_of_req(req);
+	INFO(afbitf, "method 'move' called for boardid %d", board->id);
+
+	/* retrieves the arguments of the move */
+	index = afb_req_value(req, "index");
+	i = index == NULL ? -1 : atoi(index);
+
+	/* checks validity of arguments */
+	if (i < 0 || i > 8) {
+		WARNING(afbitf, "can't move to %s: %s", index?:"?", index?"wrong value":"not set");
+		afb_req_fail(req, "error", "bad request");
+		return;
+	}
+
+	/* checks validity of the state */
+	if (winner(board->board) != 0) {
+		WARNING(afbitf, "can't move to %s: game is terminated", index);
+		afb_req_fail(req, "error", "game terminated");
+		return;
+	}
+
+	/* checks validity of the move */
+	if (board->board[i] != ' ') {
+		WARNING(afbitf, "can't move to %s: room occupied", index);
+		afb_req_fail(req, "error", "occupied");
+		return;
+	}
+
+	/* applies the move */
+	INFO(afbitf, "method 'move' for boardid %d, index=%s", board->id, index);
+	add_move(board, i);
+
+	/* replies */
+	afb_req_success(req, NULL, NULL);
+
+	/* signals change */
+	changed(board, "move");
+}
+
+/*
+ * set the level
+ */
+static void level(struct afb_req req)
+{
+	struct board *board;
+	int l;
+	const char *level;
+
+	/* retrieves the context for the session */
+	board = board_of_req(req);
+	INFO(afbitf, "method 'level' called for boardid %d", board->id);
+
+	/* retrieves the arguments */
+	level = afb_req_value(req, "level");
+	l = level == NULL ? -1 : atoi(level);
+
+	/* check validity of arguments */
+	if (l < 1 || l > 10) {
+		WARNING(afbitf, "can't set level to %s: %s", level?:"?", level?"wrong value":"not set");
+		afb_req_fail(req, "error", "bad request");
+		return;
+	}
+
+	/* set the level */
+	INFO(afbitf, "method 'level' for boardid %d, level=%d", board->id, l);
+	board->level = l;
+
+	/* replies */
+	afb_req_success(req, NULL, NULL);
+
+	/* signals change */
+	changed(board, "level");
+}
+
+/*
+ * Join a board
+ */
+static void join(struct afb_req req)
+{
+	struct board *board, *new_board;
+	const char *id;
+
+	/* retrieves the context for the session */
+	board = board_of_req(req);
+	INFO(afbitf, "method 'join' called for boardid %d", board->id);
+
+	/* retrieves the arguments */
+	id = afb_req_value(req, "boardid");
+	if (id == NULL)
+		goto bad_request;
+
+	/* none is a special id for joining a new session */
+	if (strcmp(id, "none") == 0) {
+		new_board = get_new_board();
+		goto success;
+	}
+
+	/* searchs the board to join */
+	new_board = search_board(atoi(id));
+	if (new_board == NULL)
+		goto bad_request;
+
+	/*
+	 * joining its board is stupid but possible
+	 * however when called with the same stored pointer
+	 * afb_req_context_set will not call the release
+	 * function 'release_board'. So the use_count MUST not
+	 * be incremented.
+	 */
+	if (new_board != board)
+		new_board->use_count++;
+
+success:
+	/* set the new board (and leaves the previous one) */
+	afb_req_context_set(req, new_board, (void*)release_board);
+
+	/* replies */
+	afb_req_success(req, NULL, NULL);
+	return;
+
+bad_request:
+	WARNING(afbitf, "can't join boardid %s: %s", id ? : "?", !id ? "no boardid" : atoi(id) ? "not found" : "bad boardid");
+	afb_req_fail(req, "error", "bad request");
+	return;
+}
+
+/*
+ * Undo the last move
+ */
+static void undo(struct afb_req req)
+{
+	struct board *board;
+	int i;
+
+	/* retrieves the context for the session */
+	board = board_of_req(req);
+	INFO(afbitf, "method 'undo' called for boardid %d", board->id);
+
+	/* checks the state */
+	if (board->moves == 0) {
+		WARNING(afbitf, "can't undo");
+		afb_req_fail(req, "error", "bad request");
+		return;
+	}
+
+	/* undo the last move */
+	i = board->history[--board->moves];
+	board->board[i] = ' ';
+
+	/* replies */
+	afb_req_success(req, NULL, NULL);
+
+	/* signals change */
+	changed(board, "undo");
+}
+
+/*
+ * computer plays
+ */
+static void play(struct afb_req req)
+{
+	struct board *board;
+	int index;
+
+	/* retrieves the context for the session */
+	board = board_of_req(req);
+	INFO(afbitf, "method 'play' called for boardid %d", board->id);
+
+	/* checks validity of the state */
+	if (winner(board->board) != 0 || board->moves == 9) {
+		WARNING(afbitf, "can't play: game terminated (%s)", winner(board->board) ? "has winner" : "no room left");
+		afb_req_fail(req, "error", "game terminated");
+		return;
+	}
+
+	/* gets the move and plays it */
+	index = get_move(board);
+	add_move(board, index);
+
+	/* replies */
+	afb_req_success(req, describe(board), NULL);
+
+	/* signals change */
+	changed(board, "play");
+}
+
+static void wait(struct afb_req req)
+{
+	struct board *board;
+	struct waiter *waiter;
+
+	/* retrieves the context for the session */
+	board = board_of_req(req);
+	INFO(afbitf, "method 'wait' called for boardid %d", board->id);
+
+	/* creates the waiter and enqueues it */
+	waiter = calloc(1, sizeof *waiter);
+	waiter->req = req;
+	waiter->next = board->waiters;
+	afb_req_addref(req);
+	board->waiters = waiter;
+}
+
+/*
+ * array of the verbs exported to afb-daemon
+ */
+static const struct afb_verb_desc_v1 binding_verbs[] = {
+   /* VERB'S NAME     SESSION MANAGEMENT          FUNCTION TO CALL  SHORT DESCRIPTION */
+   { .name= "new",   .session= AFB_SESSION_NONE, .callback= new,   .info= "Starts a new game" },
+   { .name= "play",  .session= AFB_SESSION_NONE, .callback= play,  .info= "Asks the server to play" },
+   { .name= "move",  .session= AFB_SESSION_NONE, .callback= move,  .info= "Tells the client move" },
+   { .name= "board", .session= AFB_SESSION_NONE, .callback= board, .info= "Get the current board" },
+   { .name= "level", .session= AFB_SESSION_NONE, .callback= level, .info= "Set the server level" },
+   { .name= "join",  .session= AFB_SESSION_CHECK,.callback= join,  .info= "Join a board" },
+   { .name= "undo",  .session= AFB_SESSION_NONE, .callback= undo,  .info= "Undo the last move" },
+   { .name= "wait",  .session= AFB_SESSION_NONE, .callback= wait,  .info= "Wait for a change" },
+   { .name= NULL } /* marker for end of the array */
+};
+
+/*
+ * description of the binding for afb-daemon
+ */
+static const struct afb_binding binding_description =
+{
+   /* description conforms to VERSION 1 */
+   .type= AFB_BINDING_VERSION_1,
+   .v1= {				/* fills the v1 field of the union when AFB_BINDING_VERSION_1 */
+      .prefix= "tictactoe",		/* the API name (or binding name or prefix) */
+      .info= "Sample tac-tac-toe game",	/* short description of of the binding */
+      .verbs = binding_verbs		/* the array describing the verbs of the API */
+   }
+};
+
+/*
+ * activation function for registering the binding called by afb-daemon
+ */
+const struct afb_binding *afbBindingV1Register(const struct afb_binding_interface *itf)
+{
+   afbitf = itf;         // records the interface for accessing afb-daemon
+   return &binding_description;  // returns the description of the binding
+}
+