mirror of https://github.com/acanas/swad-core.git
150 lines
5.7 KiB
C
150 lines
5.7 KiB
C
// swad_follow.c: user's followers and followed
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/*
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SWAD (Shared Workspace At a Distance),
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is a web platform developed at the University of Granada (Spain),
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and used to support university teaching.
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This file is part of SWAD core.
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Copyright (C) 1999-2015 Antonio Cañas Vargas
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General 3 License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*****************************************************************************/
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/*********************************** Headers *********************************/
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/*****************************************************************************/
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#include <stdio.h> // For sprintf
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#include "swad_bool.h"
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#include "swad_database.h"
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#include "swad_follow.h"
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#include "swad_global.h"
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#include "swad_profile.h"
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#include "swad_user.h"
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/*****************************************************************************/
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/****************************** Public constants *****************************/
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/*****************************************************************************/
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/*****************************************************************************/
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/***************************** Private constants *****************************/
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/*****************************************************************************/
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/*****************************************************************************/
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/****************************** Internal types *******************************/
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/*****************************************************************************/
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/*****************************************************************************/
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/************** External global variables from others modules ****************/
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/*****************************************************************************/
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extern struct Globals Gbl;
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/*****************************************************************************/
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/************************* Internal global variables *************************/
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/*****************************************************************************/
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/*****************************************************************************/
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/***************************** Private prototypes ****************************/
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/*****************************************************************************/
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/*****************************************************************************/
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/*************** Check if a user is a follower of another user ***************/
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/*****************************************************************************/
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bool Fol_CheckUsrIsFollowerOf (long FollowerCod,long FollowedCod)
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{
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char Query[256];
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if (FollowerCod == FollowedCod)
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return false;
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/***** Check if a user is a follower of another user *****/
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sprintf (Query,"SELECT COUNT(*) FROM usr_follow"
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" WHERE FollowerCod='%ld' AND FollowedCod='%ld'",
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FollowerCod,FollowedCod);
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return (DB_QueryCOUNT (Query,"can not get if a user is a follower of another one") != 0);
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}
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/*****************************************************************************/
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/***************************** Follow another user ***************************/
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/*****************************************************************************/
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void Fol_FollowUsr (void)
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{
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extern const char *Txt_User_not_found_or_you_do_not_have_permission_;
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char Query[256];
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bool Error;
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/***** Get user to be removed *****/
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if (Usr_GetParamOtherUsrCodEncryptedAndGetUsrData ())
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{
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if (!Fol_CheckUsrIsFollowerOf (Gbl.Usrs.Me.UsrDat.UsrCod,
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Gbl.Usrs.Other.UsrDat.UsrCod))
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{
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/***** Follow user in database *****/
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sprintf (Query,"REPLACE INTO usr_follow"
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" (FollowerCod,FollowedCod,FollowTime)"
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" VALUES ('%ld','%ld',NOW())",
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Gbl.Usrs.Me.UsrDat.UsrCod,
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Gbl.Usrs.Other.UsrDat.UsrCod);
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DB_QueryREPLACE (Query,"can not follow user");
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}
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/***** Show user's profile again *****/
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Error = !Prf_ShowUserProfile ();
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}
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else
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Error = true;
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if (Error)
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Lay_ShowAlert (Lay_WARNING,Txt_User_not_found_or_you_do_not_have_permission_);
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}
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/*****************************************************************************/
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/***************************** Unfollow another user *************************/
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/*****************************************************************************/
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void Fol_UnfollowUsr (void)
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{
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extern const char *Txt_User_not_found_or_you_do_not_have_permission_;
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char Query[256];
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bool Error;
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/***** Get user to be removed *****/
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if (Usr_GetParamOtherUsrCodEncryptedAndGetUsrData ())
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{
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if (Fol_CheckUsrIsFollowerOf (Gbl.Usrs.Me.UsrDat.UsrCod,
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Gbl.Usrs.Other.UsrDat.UsrCod))
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{
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/***** Follow user in database *****/
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sprintf (Query,"DELETE FROM usr_follow"
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" WHERE FollowerCod='%ld' AND FollowedCod='%ld'",
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Gbl.Usrs.Me.UsrDat.UsrCod,
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Gbl.Usrs.Other.UsrDat.UsrCod);
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DB_QueryREPLACE (Query,"can not unfollow user");
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}
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/***** Show user's profile again *****/
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Error = !Prf_ShowUserProfile ();
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}
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else
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Error = true;
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if (Error)
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Lay_ShowAlert (Lay_WARNING,Txt_User_not_found_or_you_do_not_have_permission_);
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}
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