ztp/json_engine/json_interface.c

//
// Created by xajhu on 2019/11/19 0019.
//
#include <stdlib.h>
#include <string.h>
#include <cjson/cJSON.h>

#include "common.h"
#include "err_code.h"
#include "json_interface.h"


typedef const char *(*StructToJsonCb)(void *pStruct);
typedef int (*JsonToStructCb)(const char *pJsonStr, void **pStruct);
typedef void (*Base64Code)(void *pStruct, int enCode);

typedef struct {
    JSON_ENGINE_TYPE    typeId;
    StructToJsonCb      s2jCb;
    JsonToStructCb      j2sCb;
    Base64Code          base64Cb;
} JSON_ENGINE;

static const char *__ztp_auth_encode(void *pData)
{
    const char     *pJsonS;
    PAUTH_ZTH_REQ   p     = (PAUTH_ZTH_REQ)pData;
    cJSON          *pRoot = cJSON_CreateObject();

    if(!p) {
        return NULL;
    }

    if(p->pESN && strlen(p->pESN) > 0) {
        cJSON_AddStringToObject(pRoot, "ESN",    p->pESN);
    }

    pJsonS  = cJSON_Print(pRoot);
    cJSON_Delete(pRoot);
    return pJsonS;
}

static int __ztp_auth_decode(const char *pJsonS, void **pStruct)
{
    cJSON  *pRoot, *pVal;
    PAUTH_ZTH_RSP   pData;
    *pStruct = malloc(sizeof(AUTH_ZTH_RSP));

    if(*pStruct == NULL) {
        return -ERR_INPUTERR;
    }

    pData = (PAUTH_ZTH_RSP) * pStruct;
    pRoot = cJSON_Parse(pJsonS);

    if(!pRoot) {
        return -ERR_JSONERR;
    }

    memset(pData, 0, sizeof(AUTH_ZTH_RSP));
    pVal = cJSON_GetObjectItem(pRoot, "status");

    if(cJSON_IsString(pVal)) {
        pData->status = strdup(pVal->valuestring);
    }

    pVal = cJSON_GetObjectItem(pRoot, "iptype");

    if(cJSON_IsString(pVal)) {
        pData->iptype = (unsigned int)strtoul(pVal->valuestring, 0, 10);
    }

    pVal = cJSON_GetObjectItem(pRoot, "ip");

    if(cJSON_IsString(pVal)) {
        pData->ip = (unsigned int)strtoul(pVal->valuestring, 0, 10);
    }

    pVal = cJSON_GetObjectItem(pRoot, "code");

    if(cJSON_IsString(pVal)) {
        pData->code = strdup(pVal->valuestring);
    }

    cJSON_Delete(pRoot);
    return ERR_OK;
}


static JSON_ENGINE g_jSonEngine[] = {
        {JE_AUTH_ZTP,       __ztp_auth_encode,      __ztp_auth_decode, NULL},
        {JSON_ENGINE_MAX,NULL,              NULL, NULL}
};


int Json2Struct(const char *pJsonStr, void *pData, JSON_ENGINE_TYPE type,
                int enBase64)
{
    if(pJsonStr == NULL || pData == NULL) {
        return -ERR_INPUTERR;
    }

    if(type < 0 || type >= JSON_ENGINE_MAX) {
        return -ERR_INPUTERR;
    }

    //LOG_EX(LOG_Debug, "Json:\n%s\n", pJsonStr);

    if(g_jSonEngine[type].j2sCb) {
        g_jSonEngine[type].j2sCb(pJsonStr, pData);

        if(enBase64 && g_jSonEngine[type].base64Cb) {
            g_jSonEngine[type].base64Cb(pData, FALSE);
        }

        return ERR_OK;
    } else {
        return -ERR_NOTSUPPORT;
    }
}

const char *Struct2Json(void *pStruct, JSON_ENGINE_TYPE type, int enBase64,
                        int *pErr)
{
    if(pStruct == NULL || pErr == NULL) {
        if(pErr) {
            *pErr = -ERR_INPUTERR;
        }

        return NULL;
    }

    if(type < 0 || type >= JSON_ENGINE_MAX) {
        *pErr = -ERR_INPUTERR;
        return NULL;
    }

    *pErr = ERR_OK;

    if(enBase64 && g_jSonEngine[type].base64Cb) {
        g_jSonEngine[type].base64Cb(pStruct, TRUE);
    }

    if(g_jSonEngine[type].s2jCb) {
        const char *pJsongStr = g_jSonEngine[type].s2jCb(pStruct);
        //LOG_EX(LOG_Debug, "Json: \n%s\n", pJsongStr);
        return (pJsongStr);
    } else {
        return NULL;
    }
}