#include <string.h>

#include <mysql.h>
#include <mysql/plugin_auth.h>
#include <mysql/client_plugin.h>

#include "interfaces.h"
#include "ldapReader.h"

static IMySQLLDAPAuthModule* _module;

static int authenticateUser(MYSQL_PLUGIN_VIO *vio, MYSQL_SERVER_AUTH_INFO *info)
{
    char *pkt;
    int pkt_len;

    /* read the password as null-terminated string, fail on error */
    if ((pkt_len= vio->read_packet(vio, (unsigned char**) &pkt)) < 0)
        return CR_ERROR;

    /* fail on empty password */
    if (!pkt_len || *pkt == '\0')
    {
        info->password_used= PASSWORD_USED_NO;
        return CR_ERROR;
    }

    info->password_used= PASSWORD_USED_YES;
    return _module->Authenticate(info->user_name, pkt) ? CR_OK : CR_ERROR;
}

static int auth_simple_client (MYSQL_PLUGIN_VIO *vio, MYSQL *mysql)
{
    return vio->write_packet(vio, (const unsigned char *)mysql->passwd, strlen(mysql->passwd) + 1) ?
        CR_ERROR : CR_OK;
}

static struct st_mysql_auth auth_ldap_handler =
{
    MYSQL_AUTHENTICATION_INTERFACE_VERSION,
    "auth_ldap",
    authenticateUser,
    NULL,
    NULL
};

int initModule(void*)
{
    _module = new LDAPReader(LDAP_URI, LDAP_ATTRIBUTE, LDAP_BASEDN);
    return 0;
}

int destroyModule(void*)
{
    delete _module;
    _module = nullptr;
    return 0;
}

mysql_declare_plugin(auth_ldap)
{
    MYSQL_AUTHENTICATION_PLUGIN,
    &auth_ldap_handler,
    "auth_ldap",
    "isundil",
    "LDAP authentication plugin",
    PLUGIN_LICENSE_GPL,
    initModule,
    destroyModule,
    0x0100,
    NULL,
    NULL,
    NULL,
    0
} mysql_declare_plugin_end;

mysql_declare_client_plugin(AUTHENTICATION)
  "auth_ldap",
  "isundil",
  "LDAP Authentication plugin",
  {1,0,0},
  "GPL",
  NULL,
  NULL,
  NULL,
  NULL,
  auth_simple_client
mysql_end_client_plugin;