mirror of https://github.com/acanas/swad-core.git
172 lines
6.6 KiB
C
172 lines
6.6 KiB
C
// swad_QR.c: QR codes
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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) 1999-2019 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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#define _GNU_SOURCE // For asprintf
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#include <stdio.h> // For asprintf
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#include <stdlib.h> // For free
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#include "swad_action.h"
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#include "swad_global.h"
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#include "swad_HTML.h"
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#include "swad_ID.h"
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#include "swad_parameter.h"
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#include "swad_QR.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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#define QR_CODE_SIZE ((6 + 25 + 6) * 8)
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#define QR_DEFAULT_TYPE QR_ID
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/*****************************************************************************/
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/******************************* Private 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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/************************** Private 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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/***************** Put a link to a print view of a QR code *******************/
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/*****************************************************************************/
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void QR_PutLinkToPrintQRCode (Act_Action_t Action,void (*FuncParams) (void))
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{
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extern const char *Txt_QR_code;
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/***** Link to print QR *****/
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Lay_PutContextualLinkOnlyIcon (Action,NULL,FuncParams,
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"qrcode.svg",
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Txt_QR_code);
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}
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/*****************************************************************************/
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/************************* Put parameter QR string ***************************/
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/*****************************************************************************/
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void QR_PutParamQRString (void)
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{
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Par_PutHiddenParamString (NULL,"QRString",Gbl.QR.Str);
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}
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/*****************************************************************************/
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/******************************* Show a QR code ******************************/
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/*****************************************************************************/
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void QR_PrintQRCode (void)
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{
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char QRString[Cns_MAX_BYTES_WWW + 1];
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/***** Get QR string *****/
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Par_GetParToText ("QRString",QRString,Cns_MAX_BYTES_WWW);
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/***** Show QR code *****/
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QR_ImageQRCode (QRString);
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}
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/*****************************************************************************/
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/******************** Write an QR (image) based on a string ******************/
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/*****************************************************************************/
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void QR_ImageQRCode (const char *QRString)
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{
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char *URL;
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HTM_DIV_Begin ("class=\"CM\" style=\"margin:0 auto; width:%upx;\"",
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QR_CODE_SIZE);
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if (asprintf (&URL,"https://chart.googleapis.com/chart?cht=qr&chs=%ux%u&chl=%s",
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QR_CODE_SIZE,QR_CODE_SIZE,QRString) < 0)
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Lay_NotEnoughMemoryExit ();
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HTM_IMG (URL,NULL,QRString,
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"style=\"width:%upx;height:%upx;border:1px dashed silver;\"",
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QR_CODE_SIZE,QR_CODE_SIZE);
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free (URL);
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HTM_DIV_End ();
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}
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/*****************************************************************************/
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/*************** Show QR code with direct link (shortcut URL) ****************/
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/*****************************************************************************/
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void QR_LinkTo (unsigned Size,const char *ParamStr,long Cod)
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{
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extern const char *Txt_Shortcut;
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extern const char *Lan_STR_LANG_ID[1 + Lan_NUM_LANGUAGES];
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char *URL;
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/***** Show QR code with direct link to the current centre *****/
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if (asprintf (&URL,"https://chart.googleapis.com/chart?cht=qr&chs=%ux%u&chl=%s/%s?%s=%ld",
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Size,Size,
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Cfg_URL_SWAD_CGI,
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Lan_STR_LANG_ID[Gbl.Prefs.Language],ParamStr,Cod) < 0)
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Lay_NotEnoughMemoryExit ();
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HTM_IMG (URL,NULL,Txt_Shortcut,
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"style=\"width:%upx;height:%upx;\"",Size,Size);
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free (URL);
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}
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/*****************************************************************************/
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/*********** Show QR code with direct link to an exam announcement ***********/
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/*****************************************************************************/
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void QR_ExamAnnnouncement (void)
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{
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extern const char *Txt_Link_to_announcement_of_exam;
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char *URL;
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/***** Show QR code with direct link to the exam announcement *****/
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HTM_DIV_Begin ("class=\"CM\"");
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if (asprintf (&URL,"https://chart.googleapis.com/chart?cht=qr&chs=%ux%u&chl=%s/?crs=%ld%%26act=%ld",
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300,300,
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Cfg_URL_SWAD_CGI,Gbl.Hierarchy.Crs.CrsCod,
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Act_GetActCod (ActSeeAllExaAnn)) < 0)
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Lay_NotEnoughMemoryExit ();
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HTM_IMG (URL,NULL,Txt_Link_to_announcement_of_exam,
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"style=\"width:250px;height:250px;\"");
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free (URL);
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HTM_DIV_End ();
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}
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