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/*
* Copyright (C) 2015-2020 "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>
#define AFB_BINDING_VERSION 3
#include <afb/afb-binding.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 (afb_req_t 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 (afb_req_t request)
{
MyClientContextT *ctx = (MyClientContextT*) afb_req_context_get(request);
if (!ctx) {
afb_req_fail(request, "invalid-state", "Can't perform action");
return;
}
// 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 (afb_req_t request)
{
MyClientContextT *ctx = (MyClientContextT*) afb_req_context_get(request);
if (!ctx) {
afb_req_success(request, NULL, NULL);
return;
}
// 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(afb_req_t request, unsigned loa)
{
if (afb_req_session_set_LOA(request, loa) >= 0)
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 clientSetLOA(afb_req_t request)
{
setLOA(request, (unsigned)(intptr_t)request->vcbdata);
}
static void clientCheckLOA(afb_req_t 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_v3 verbs[]= {
{.verb="create", .session=AFB_SESSION_NONE, .callback=myCreate , .info="Create a new session"},
{.verb="action", .session=AFB_SESSION_CHECK , .callback=myAction , .info="Use Session Context"},
{.verb="close" , .session=AFB_SESSION_CLOSE , .callback=myClose , .info="Free Context"},
{.verb="set_loa_0", .session=AFB_SESSION_RENEW, .callback=clientSetLOA ,.vcbdata=(void*)(intptr_t)0 ,.info="Set level of assurance to 0"},
{.verb="set_loa_1", .session=AFB_SESSION_RENEW, .callback=clientSetLOA ,.vcbdata=(void*)(intptr_t)1 ,.info="Set level of assurance to 1"},
{.verb="set_loa_2", .session=AFB_SESSION_RENEW, .callback=clientSetLOA ,.vcbdata=(void*)(intptr_t)2 ,.info="Set level of assurance to 2"},
{.verb="set_loa_3", .session=AFB_SESSION_RENEW, .callback=clientSetLOA ,.vcbdata=(void*)(intptr_t)3 ,.info="Set level of assurance to 3"},
{.verb="check_loa_ge_0", .session=AFB_SESSION_LOA_0, .callback=clientCheckLOA ,.vcbdata=(void*)(intptr_t)0 ,.info="Check whether level of assurance is greater or equal to 0"},
{.verb="check_loa_ge_1", .session=AFB_SESSION_LOA_1, .callback=clientCheckLOA ,.vcbdata=(void*)(intptr_t)1 ,.info="Check whether level of assurance is greater or equal to 1"},
{.verb="check_loa_ge_2", .session=AFB_SESSION_LOA_2, .callback=clientCheckLOA ,.vcbdata=(void*)(intptr_t)2 ,.info="Check whether level of assurance is greater or equal to 2"},
{.verb="check_loa_ge_3", .session=AFB_SESSION_LOA_3, .callback=clientCheckLOA ,.vcbdata=(void*)(intptr_t)3 ,.info="Check whether level of assurance is greater or equal to 3"},
{0, 0, 0, 0, 0, 0, 0}
};
const struct afb_binding_v3 afbBindingV3 =
{
.api = "context", /* the API name (or binding name or prefix) */
.info = "Sample of Client Context Usage", /* short description of of the binding */
.verbs = verbs /* the array describing the verbs of the API */
};
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