Nginx module of URL authorization

根据业务需要，对用户请求的进行认证，Nginx根据URL中的ID取出memcached的值，并与URL中的authkey对比认证。需要用到第三方库libmemcached。
在config中增加：

CORE_LIBS="$CORE_LIBS -L/byread/bin/libmemcached/lib -lmemcached"

具体实现：

#include <libmemcached/memcached.h>

static ngx_int_t
ngx_http_sukai_authorize_handler(ngx_http_request_t *r)
{
		ngx_http_sukai_authorize_loc_conf_t *conf;
        conf = ngx_http_get_module_loc_conf(r, ngx_http_sukai_authorize_module);
        if(conf->enable) {
			memcached_st *mcd;
			memcached_return_t rc;
			ngx_uint_t vlen;
			uint32_t flag;
			char *val = NULL;
			memcached_server_st *servers;
			mcd = memcached_create(NULL);
			servers = memcached_server_list_append(NULL,"127.0.0.1",11211,&rc);
			rc = memcached_server_push(mcd,servers);
			char byid[18];
			char authkey[128];
			char realuri[128];
			char prekey[] = "book_auth_";
			sscanf((char *)r->uri.data,"/%[0-9]/%[0-9a-z]%s",byid,authkey,realuri);
			val = memcached_get(mcd,strcat(prekey,byid),strlen(byid) + strlen(prekey),&vlen,&flag,&rc);
			if (val == NULL || ngx_strcmp(authkey, val) != 0) {
				return NGX_HTTP_NOT_ALLOWED;
			}
			r->uri.len = strlen(realuri);
			char* pRealUrl = (char*)malloc(strlen(realuri) + 1);
			strcpy(pRealUrl ,realuri);
			r->uri.data = (u_char *)pRealUrl;
			r->valid_unparsed_uri = 0;
			//rc = memcached_set(mcd,"realuri2",8,(char *)r->uri.data,r->uri.len,(time_t)180,(uint32_t)0);
			//rc = memcached_delete(mcd,prekey,strlen(prekey),(time_t)0);
			memcached_server_free(servers);
			memcached_free(mcd);
			if (NULL != val) free(val);
        } else {
			char byid[18];
			char authkey[128];
			char realuri[128];
			sscanf((char *)r->uri.data,"/%[0-9]/%[0-9a-z]%s",byid,authkey,realuri);
			r->uri.len = strlen(realuri);
			char* pRealUrl = (char*)malloc(strlen(realuri) + 1);
			strcpy(pRealUrl ,realuri);
			r->uri.data = (u_char *)pRealUrl;
			r->valid_unparsed_uri = 0;
		}
        return NGX_OK;
}