c++: Add tutorial tuto-5 for C++ class base_api_t

Added the tuto-5 that show how to benefit from the
new 'binding-object' header and its new class 'base_api_t'.

Change-Id: I81e6fd8dc5899b8e93d75530d902c0e12fba72a9
Signed-off-by: Loïc Collignon <loic.collignon@iot.bzh>

1 files changed, 93 insertions, 0 deletions

diff --git a/bindings/tutorial/tuto-5.cpp b/bindings/tutorial/tuto-5.cpp
new file mode 100644
index 00000000..458ae7b5
--- /dev/null
+++ b/bindings/tutorial/tuto-5.cpp
@@ -0,0 +1,93 @@
+#include <afb/c++/binding>
+#include <json-c/json.h>
+#include <string.h>
+
+class tuto5
+	: public afb::base_api_t<tuto5>
+{
+private:
+	afb::event event_login;
+	afb::event event_logout;
+
+public:
+	void login(afb::req req)
+	{
+		json_object *user, *passwd;
+
+		json_object* args = req.json();
+		if (!json_object_object_get_ex(args, "user", &user)
+		|| !json_object_object_get_ex(args, "password", &passwd)) {
+			AFB_REQ_ERROR(req, "login, bad request: %s", json_object_get_string(args));
+			req.fail("bad-request");
+		} else if (afb_req_context_get(req)) {
+			AFB_REQ_ERROR(req, "login, bad state, logout first");
+			req.fail("bad-state");
+		} else if (std::string(json_object_get_string(passwd)) != std::string("please")) {
+			AFB_REQ_ERROR(req, "login, unauthorized: %s", json_object_get_string(args));
+			req.fail("unauthorized");
+		} else {
+			char* username = strdup(json_object_get_string(user));
+			AFB_REQ_NOTICE(req, "login user: %s", username);
+			req.session_set_LOA(1);
+			afb_req_context_set(req, username, free);
+			req.success();
+			event_login.push(json_object_new_string(username));
+		}
+	}
+
+	void action(afb::req req) const
+	{
+		json_object* val;
+		json_object* args = req.json();
+		char* username = reinterpret_cast<char*>(afb_req_context_get(req));
+		AFB_REQ_NOTICE(req, "action for user %s: %s", username, json_object_get_string(args));
+		if (json_object_object_get_ex(args, "subscribe", &val)) {
+			if (json_object_get_boolean(val)) {
+				AFB_REQ_NOTICE(req, "user %s subscribes to events", username);
+				req.subscribe(event_login);
+				req.subscribe(event_logout);
+			} else {
+				AFB_REQ_NOTICE(req, "user %s unsubscribes to events", username);
+				req.unsubscribe(event_login);
+				req.unsubscribe(event_logout);
+			}
+		}
+		req.success(json_object_get(args));
+	}
+
+	void logout(afb::req req)
+	{
+		char* username = reinterpret_cast<char*>(afb_req_context_get(req));
+		AFB_REQ_NOTICE(req, "login user %s out", username);
+		event_logout.push(json_object_new_string(username));
+		req.session_set_LOA(0);
+		afb_req_context_clear(req);
+		req.success();
+	}
+
+	int preinit(afb_api_t h) override
+	{
+		return !(
+			(add_verb<&tuto5::login>("login", "log in the system") == 0) &&
+			(add_verb<&tuto5::action>("action", "perform an action", nullptr, nullptr, AFB_SESSION_LOA_1) == 0) &&
+			(add_verb<&tuto5::logout>("logout", "log out the system", nullptr, nullptr, AFB_SESSION_LOA_1) == 0)
+		);
+	}
+
+	int init() override
+	{
+		AFB_API_NOTICE(api_, "init");
+		event_login = make_event("login");
+		event_logout = make_event("logout");
+		if (event_login.is_valid() && event_logout.is_valid())
+			return 0;
+		AFB_API_ERROR(api_, "Can't create events");
+		return -1;
+	}
+};
+
+int afbBindingEntry(afb_api_t h)
+{
+	afb::new_api<tuto5>(h, "tuto-5", "fifth tutorial: C++");
+	return 0;
+}