cjson_filter

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <cjson/cJSON.h>

#define ERR_INVALID_URL (-10)
#define ERR              (-1)

int filter_single_sensitive_word(const cJSON *item, char *name)
{
	cJSON *subitem = NULL;
	char *tmp = NULL;

	if (NULL == item)
	{
		fprintf(stderr, "Parameter is invalid\n");
		return ERR;
	}

	subitem = cJSON_GetObjectItem(item, name);
	if (cJSON_IsString(subitem) && (subitem->valuestring != NULL))
	{
		for (tmp = subitem->valuestring; *tmp; tmp++)
		{
			*tmp = '*';
		}
	}

	return 0;
}

int filter_sensitive_word(char *url, int size)
{
	int ret = 0;
	char *filter_str = NULL;

	/*json字符串非法，解析url失败*/
	cJSON *url_json = cJSON_Parse(url);
	if (NULL == url_json)
	{
		const char *error_ptr = cJSON_GetErrorPtr();
        if (error_ptr != NULL)
        {
            fprintf(stderr, "Error before: %s\n", error_ptr);
        }
        ret = ERR_INVALID_URL;
        return ret;
	}

	/**/
	ret = filter_single_sensitive_word(url_json, "ak");
	if (0 != ret)
	{
		fprintf(stderr, "filter single sensitive word fail\n");
		return ret;
	}

	ret = filter_single_sensitive_word(url_json, "sk");
	if (0 != ret)
	{
		fprintf(stderr, "filter single sensitive word fail\n");
		return ret;
	}

	filter_str = cJSON_PrintUnformatted(url_json);
	strncpy(url, filter_str, size);
	url[size-1] = '\0';

	//fprintf(stderr, "%s\n", cJSON_PrintUnformatted(url_json));

	cJSON_Delete(url_json);
	return 0;
}

int main()
{
	int ret = 0;
    //char url[] = "{\"source\":\"ssdj\",\"ad\":  \"sjdhjfdsfjd\",\"tk\":\"abc\",\"sd\":\"hsdfjdshd\"}";
    char *url = "{\"dk\":}";
    ret = filter_sensitive_word(url, sizeof(url));
    if ((ret == 0) || (ret == ERR_INVALID_URL))
    {
    	printf("%s\n", url);
    }
    else
    {
    	printf("filter sensitive word fail, errno[%d]", ret);
    }
    return 0;
}