swad-core/swad_zip.c

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22 KiB
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// swad_zip.c: compress files in file browsers
/*
SWAD (Shared Workspace At a Distance),
is a web platform developed at the University of Granada (Spain),
and used to support university teaching.
This file is part of SWAD core.
Copyright (C) 1999-2024 Antonio Ca<EFBFBD>as Vargas
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This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General 3 License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*****************************************************************************/
/*********************************** Headers *********************************/
/*****************************************************************************/
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#define _GNU_SOURCE // For asprintf
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#include <dirent.h> // For scandir, etc.
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#include <errno.h> // For errno
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#include <linux/limits.h> // For PATH_MAX
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#include <stdio.h> // For asprintf
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#include <stdlib.h> // For system...
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#include <string.h> // For string functions...
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#include <sys/stat.h> // For mkdir...
#include <sys/types.h> // For mkdir...
#include <unistd.h> // For chdir...
#include "swad_action_list.h"
#include "swad_alert.h"
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#include "swad_box.h"
#include "swad_browser.h"
#include "swad_browser_database.h"
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#include "swad_config.h"
#include "swad_error.h"
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#include "swad_form.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"
#include "swad_parameter.h"
#include "swad_string.h"
#include "swad_theme.h"
/*****************************************************************************/
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/***************************** Private constants *****************************/
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/*****************************************************************************/
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#define ZIP_MiB (1024ULL * 1024ULL)
#define ZIP_MAX_SIZE_UNCOMPRESSED (1024ULL * ZIP_MiB)
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/*****************************************************************************/
/************** External global variables from others modules ****************/
/*****************************************************************************/
extern struct Globals Gbl;
/*****************************************************************************/
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/***************************** Private prototypes ****************************/
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/*****************************************************************************/
static void ZIP_PutLinkToCreateZIPAsgWrkPars (__attribute__((unused)) void *Args);
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static void ZIP_CreateTmpDirForCompression (void);
static void ZIP_CreateDirCompressionUsr (struct Usr_Data *UsrDat);
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static void ZIP_CompressFolderIntoZIP (void);
static unsigned long long ZIP_CloneDir (const char *Path,const char *PathClone,const char *PathInTree);
static void ZIP_ShowLinkToDownloadZIP (const char *FileName,const char *URL,
off_t FileSize,unsigned long long UncompressedSize);
/*****************************************************************************/
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/*********** Put link to create ZIP file of assignments and works ************/
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/*****************************************************************************/
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void ZIP_PutLinkToCreateZIPAsgWrk (void)
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{
extern const char *Txt_Create_ZIP_file;
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Lay_PutContextualLinkIconText (ActAdmAsgWrkCrs,NULL,
ZIP_PutLinkToCreateZIPAsgWrkPars,NULL,
"download.svg",Ico_BLACK,
Txt_Create_ZIP_file,NULL);
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}
static void ZIP_PutLinkToCreateZIPAsgWrkPars (__attribute__((unused)) void *Args)
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{
Usr_PutParSelectedUsrsCods (&Gbl.Usrs.Selected);
Brw_PutParFullTreeIfSelected (&Gbl.FileBrowser.FullTree);
Par_PutParChar ("CreateZIP",'Y');
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}
/*****************************************************************************/
/****************** Get whether to create ZIP file from form *****************/
/*****************************************************************************/
bool ZIP_GetCreateZIPFromForm (void)
{
return Par_GetParBool ("CreateZIP");
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}
/*****************************************************************************/
/*************** Create the zip file with assignments and works **************/
/*************** and put a link to download it **************/
/*****************************************************************************/
void ZIP_CreateZIPAsgWrk (void)
{
extern const char *Txt_works_ZIP_FILE_NAME;
struct Usr_Data UsrDat;
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const char *Ptr;
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char StrZip[128 + PATH_MAX];
char Path[PATH_MAX + 1 +
NAME_MAX + 1 +
NAME_MAX + 1];
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int Result;
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char FileNameZIP[NAME_MAX + 1];
char PathFileZIP[PATH_MAX + 1];
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struct stat FileStatus;
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char URLWithSpaces[PATH_MAX + 1];
char URL[PATH_MAX + 1];
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/***** Create zip file
with the assignments and works
of the selected users *****/
/* Create temporary directory
for the compression of assignments and works */
ZIP_CreateTmpDirForCompression ();
/* Initialize structure with user's data */
Usr_UsrDataConstructor (&UsrDat);
/* Create temporary directory for each selected user
inside the directory used for compression */
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Ptr = Gbl.Usrs.Selected.List[Rol_UNK];
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while (*Ptr)
{
Par_GetNextStrUntilSeparParMult (&Ptr,UsrDat.EnUsrCod,
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Cry_BYTES_ENCRYPTED_STR_SHA256_BASE64);
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Usr_GetUsrCodFromEncryptedUsrCod (&UsrDat);
if (Usr_ChkUsrCodAndGetAllUsrDataFromUsrCod (&UsrDat, // Get user's data from database
Usr_DONT_GET_PREFS,
Usr_DONT_GET_ROLE_IN_CRS))
if (Enr_CheckIfUsrBelongsToCurrentCrs (&UsrDat))
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ZIP_CreateDirCompressionUsr (&UsrDat);
}
/* Free memory used for user's data */
Usr_UsrDataDestructor (&UsrDat);
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/***** Create a temporary public directory
used to download the zip file *****/
Brw_CreateDirDownloadTmp ();
/***** Relative path of the directory with the works to compress *****/
snprintf (Path,sizeof (Path),"%s/%s",
Cfg_PATH_ZIP_PRIVATE,Gbl.FileBrowser.ZIP.TmpDir);
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/***** Change to directory of the assignments and works
in order to start the path in the zip file from there *****/
if (chdir (Path))
Err_ShowErrorAndExit ("Can not change to temporary folder for compression.");
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/***** Create public zip file with the assignment and works *****/
snprintf (FileNameZIP,sizeof (FileNameZIP),"%s.zip",Txt_works_ZIP_FILE_NAME);
snprintf (PathFileZIP,sizeof (PathFileZIP),"%s/%s/%s/%s",
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Cfg_PATH_FILE_BROWSER_TMP_PUBLIC,
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Gbl.FileBrowser.TmpPubDir.L,
Gbl.FileBrowser.TmpPubDir.R,
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FileNameZIP);
snprintf (StrZip,sizeof (StrZip),"nice -n 19 zip -q -r '%s' *",
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PathFileZIP);
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Result = system (StrZip);
/***** Return to the CGI directory *****/
if (chdir (Cfg_PATH_CGI_BIN))
Err_ShowErrorAndExit ("Can not change to cgi-bin folder.");
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/***** If the zip command has been sucessful, write the link to zip file *****/
if (Result == 0)
{
/***** Get file size *****/
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if (lstat (PathFileZIP,&FileStatus)) // On success ==> 0 is returned
Err_ShowErrorAndExit ("Can not get information about a file or folder.");
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else
{
/***** Create URL pointing to ZIP file *****/
snprintf (URLWithSpaces,sizeof (URLWithSpaces),"%s/%s/%s/%s",
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Cfg_URL_FILE_BROWSER_TMP_PUBLIC,
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Gbl.FileBrowser.TmpPubDir.L,
Gbl.FileBrowser.TmpPubDir.R,
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FileNameZIP);
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Str_CopyStrChangingSpaces (URLWithSpaces,URL,PATH_MAX); // In HTML, URL must have no spaces
/****** Link to download file *****/
ZIP_ShowLinkToDownloadZIP (FileNameZIP,URL,FileStatus.st_size,0);
}
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}
else
Err_ShowErrorAndExit ("Can not compress files into zip file.");
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/***** Remove the directory of compression *****/
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Fil_RemoveTree (Path);
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}
/*****************************************************************************/
/********* Create temporary directory to put the works to compress ***********/
/*****************************************************************************/
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static void ZIP_CreateTmpDirForCompression (void)
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{
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char PathDirTmp[PATH_MAX + 1];
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/***** If the private directory does not exist, create it *****/
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Fil_CreateDirIfNotExists (Cfg_PATH_ZIP_PRIVATE);
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/***** Create a new temporary directory *****/
Str_Copy (Gbl.FileBrowser.ZIP.TmpDir,Cry_GetUniqueNameEncrypted (),
sizeof (Gbl.FileBrowser.ZIP.TmpDir) - 1);
snprintf (PathDirTmp,sizeof (PathDirTmp),"%s/%s",
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Cfg_PATH_ZIP_PRIVATE,Gbl.FileBrowser.ZIP.TmpDir);
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if (mkdir (PathDirTmp,(mode_t) 0xFFF))
Err_ShowErrorAndExit ("Can not create temporary folder for compression.");
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}
/*****************************************************************************/
/**************** Create link to a user's works zone ******************/
/**************** in the temporary directory of compression ******************/
/*****************************************************************************/
static void ZIP_CreateDirCompressionUsr (struct Usr_Data *UsrDat)
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{
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char FullNameAndUsrID[NAME_MAX + 1];
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char PathFolderUsrInsideCrs[128 + PATH_MAX + NAME_MAX];
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char LinkTmpUsr[PATH_MAX + 1];
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char Link[PATH_MAX + 1 + Cns_MAX_DECIMAL_DIGITS_UINT + 1];
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unsigned NumTry;
bool Success;
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/***** Create a link in the tree of compression
with a name that identifies the owner
of the assignments and works *****/
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/* Create link name for this user */
Str_Copy (FullNameAndUsrID,UsrDat->Surname1,sizeof (FullNameAndUsrID) - 1);
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if (UsrDat->Surname1[0] &&
UsrDat->Surname2[0])
Str_Concat (FullNameAndUsrID,"_",sizeof (FullNameAndUsrID) - 1); // Separation between surname 1 and surname 2
Str_Concat (FullNameAndUsrID,UsrDat->Surname2,sizeof (FullNameAndUsrID) - 1);
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if ((UsrDat->Surname1[0] ||
UsrDat->Surname2[0]) &&
UsrDat->FrstName[0])
Str_Concat (FullNameAndUsrID,"_",sizeof (FullNameAndUsrID) - 1); // Separation between surnames and first name
Str_Concat (FullNameAndUsrID,UsrDat->FrstName,sizeof (FullNameAndUsrID) - 1);
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if ((UsrDat->Surname1[0] ||
UsrDat->Surname2[0] ||
UsrDat->FrstName[0]) &&
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UsrDat->IDs.Num)
Str_Concat (FullNameAndUsrID,"-",sizeof (FullNameAndUsrID) - 1); // Separation between name and ID
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if (UsrDat->IDs.Num) // If this user has at least one ID
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Str_Concat (FullNameAndUsrID,UsrDat->IDs.List[0].ID,
sizeof (FullNameAndUsrID) - 1); // First user's ID
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Str_ConvertToValidFileName (FullNameAndUsrID);
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/* Create path to folder and link */
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snprintf (PathFolderUsrInsideCrs,sizeof (PathFolderUsrInsideCrs),
"%s/usr/%02u/%ld",
Gbl.Crs.Path.AbsPriv,(unsigned) (UsrDat->UsrCod % 100),UsrDat->UsrCod);
snprintf (LinkTmpUsr,sizeof (LinkTmpUsr),"%s/%s/%s",
Cfg_PATH_ZIP_PRIVATE,Gbl.FileBrowser.ZIP.TmpDir,FullNameAndUsrID);
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/* Try to create a link named LinkTmpUsr to PathFolderUsrInsideCrs */
if (symlink (PathFolderUsrInsideCrs,LinkTmpUsr) != 0)
{
for (Success = false, NumTry = 2;
!Success && errno == EEXIST && NumTry<=1000;
NumTry++)
{
// Link exists ==> a former user share the same name and ID
// (probably a unique user has created two or more accounts)
snprintf (Link,sizeof (Link),"%s-%u",LinkTmpUsr,NumTry);
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if (symlink (PathFolderUsrInsideCrs,Link) == 0)
Success = true;
}
if (!Success)
Err_ShowErrorAndExit ("Can not create temporary link for compression.");
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}
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}
/*****************************************************************************/
/********************* Compress a folder into ZIP file ***********************/
/*****************************************************************************/
void ZIP_CompressFileTree (void)
{
/***** Get parameters related to file browser *****/
Brw_GetParAndInitFileBrowser ();
/***** Compress folder into ZIP *****/
ZIP_CompressFolderIntoZIP ();
/***** Show again file browser *****/
Brw_ShowAgainFileBrowserOrWorks ();
}
/*****************************************************************************/
/*************** Create the zip file with assignments and works **************/
/*************** and put a link to download it **************/
/*****************************************************************************/
static void ZIP_CompressFolderIntoZIP (void)
{
extern const char *Txt_ROOT_FOLDER_EXTERNAL_NAMES[Brw_NUM_TYPES_FILE_BROWSER];
extern const char *Txt_The_folder_is_empty;
extern const char *Txt_The_contents_of_the_folder_are_too_big;
unsigned long long UncompressedSize;
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char StrZip[128 + PATH_MAX];
char Path[PATH_MAX + 1 +
PATH_MAX + 1];
char PathCompression[PATH_MAX + 1 +
NAME_MAX + 1 +
NAME_MAX + 1];
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int Result;
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char *FileNameZIP;
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char PathFileZIP[PATH_MAX + 1];
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struct stat FileStatus;
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char URLWithSpaces[PATH_MAX + 1];
char URL[PATH_MAX + 1];
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/***** Create temporary private directory
for the compression of folder *****/
ZIP_CreateTmpDirForCompression ();
/***** Create a temporary public directory
used to download the zip file *****/
Brw_CreateDirDownloadTmp ();
/***** Create a copy of the directory to compress *****/
snprintf (Path,sizeof (Path),"%s/%s",
Gbl.FileBrowser.Path.AboveRootFolder,
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Gbl.FileBrowser.FilFolLnk.Full);
snprintf (PathCompression,sizeof (PathCompression),"%s/%s",
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Cfg_PATH_ZIP_PRIVATE,
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Gbl.FileBrowser.ZIP.TmpDir); // Example: /var/www/swad/zip/<temporary_dir>
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UncompressedSize = ZIP_CloneDir (Path,PathCompression,Gbl.FileBrowser.FilFolLnk.Full);
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if (UncompressedSize == 0) // Nothing to compress
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Ale_ShowAlert (Ale_WARNING,Txt_The_folder_is_empty);
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else if (UncompressedSize > ZIP_MAX_SIZE_UNCOMPRESSED) // Uncompressed size is too big
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Ale_ShowAlert (Ale_WARNING,Txt_The_contents_of_the_folder_are_too_big);
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else
{
/***** Change to directory of the clone folder
in order to start the path in the zip file from there *****/
if (chdir (PathCompression))
Err_ShowErrorAndExit ("Can not change to temporary folder for compression.");
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/***** Create public zip file with the assignment and works *****/
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if (asprintf (&FileNameZIP,"%s.zip",
strcmp (Gbl.FileBrowser.FilFolLnk.Name,".") ? Gbl.FileBrowser.FilFolLnk.Name :
Txt_ROOT_FOLDER_EXTERNAL_NAMES[Gbl.FileBrowser.Type]) < 0)
Err_NotEnoughMemoryExit ();
snprintf (PathFileZIP,sizeof (PathFileZIP),"%s/%s/%s/%s",
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Cfg_PATH_FILE_BROWSER_TMP_PUBLIC,
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Gbl.FileBrowser.TmpPubDir.L,
Gbl.FileBrowser.TmpPubDir.R,
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FileNameZIP);
snprintf (StrZip,sizeof (StrZip),"nice -n 19 zip -q -5 -r '%s' *",
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PathFileZIP);
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Result = system (StrZip);
/***** Return to the CGI directory *****/
if (chdir (Cfg_PATH_CGI_BIN))
Err_ShowErrorAndExit ("Can not change to cgi-bin folder.");
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/***** If the zip command has not been sucessful, abort *****/
if (Result)
Err_ShowErrorAndExit ("Can not compress files into zip file.");
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/***** If the zip command has been sucessful, write the link to zip file *****/
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/* Get file size */
if (lstat (PathFileZIP,&FileStatus)) // On success ==> 0 is returned
Err_ShowErrorAndExit ("Can not get information about a file or folder.");
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else
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{
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/* Create URL pointing to ZIP file */
snprintf (URLWithSpaces,sizeof (URLWithSpaces),"%s/%s/%s/%s",
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Cfg_URL_FILE_BROWSER_TMP_PUBLIC,
Gbl.FileBrowser.TmpPubDir.L,
Gbl.FileBrowser.TmpPubDir.R,
FileNameZIP);
Str_CopyStrChangingSpaces (URLWithSpaces,URL,PATH_MAX); // In HTML, URL must have no spaces
/** Link to download file */
ZIP_ShowLinkToDownloadZIP (FileNameZIP,URL,FileStatus.st_size,UncompressedSize);
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}
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free (FileNameZIP);
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}
/***** Remove the directory of compression *****/
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Fil_RemoveTree (PathCompression);
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}
/*****************************************************************************/
/*************** Clone a directory recursively to compress it ****************/
/*****************************************************************************/
/* Example:
*
* Example starting directory with document files: /var/www/swad/crs/1000/descarga/lectures/lecture_1
* We want to compress all files inside lecture_1 into a ZIP file
* Path = /var/www/swad/crs/1000/descarga/lectures/lecture_1
* PathClone = /var/www/swad/zip/<unique_dir>
* PathInTree = "descarga/lectures/lecture_1"
* Example directory inside starting directory with document files: /var/www/swad/crs/1000/descarga/lectures/lecture_1/slides
* Path = /var/www/swad/crs/1000/descarga/lectures/lecture_1/slides
* PathClone: /var/www/swad/zip/<unique_dir>/slides
* PathInTree = "descarga/lectures/lecture_1/slides
*/
// Return: full size of directory contents
static unsigned long long ZIP_CloneDir (const char *Path,const char *PathClone,const char *PathInTree)
{
extern bool Brw_TypeIsSeeDoc[Brw_NUM_TYPES_FILE_BROWSER];
extern bool Brw_TypeIsSeeMrk[Brw_NUM_TYPES_FILE_BROWSER];
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struct dirent **FileList;
int NumFile;
int NumFiles;
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char PathFile[PATH_MAX + 1];
char PathFileClone[PATH_MAX + 1];
char PathFileInTree[PATH_MAX + 1];
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struct stat FileStatus;
Brw_FileType_t FileType;
HidVis_HiddenOrVisible_t HiddenOrVisible;
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unsigned long long FullSize = 0;
/***** Scan directory *****/
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if ((NumFiles = scandir (Path,&FileList,NULL,alphasort)) >= 0) // No error
{
/***** List files *****/
for (NumFile = 0;
NumFile < NumFiles;
NumFile++)
if (strcmp (FileList[NumFile]->d_name,".") &&
strcmp (FileList[NumFile]->d_name,"..")) // Skip directories "." and ".."
{
snprintf (PathFileInTree,sizeof (PathFileInTree),"%s/%s",
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PathInTree,FileList[NumFile]->d_name);
snprintf (PathFile,sizeof (PathFile),"%s/%s",
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Path,FileList[NumFile]->d_name);
snprintf (PathFileClone,sizeof (PathFileClone),"%s/%s",
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PathClone,FileList[NumFile]->d_name);
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FileType = Brw_IS_UNKNOWN;
if (lstat (PathFile,&FileStatus)) // On success ==> 0 is returned
Err_ShowErrorAndExit ("Can not get information about a file or folder.");
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else if (S_ISDIR (FileStatus.st_mode)) // It's a directory
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FileType = Brw_IS_FOLDER;
else if (S_ISREG (FileStatus.st_mode)) // It's a regular file
FileType = Str_FileIs (FileList[NumFile]->d_name,"url") ? Brw_IS_LINK : // It's a link (URL inside a .url file)
Brw_IS_FILE; // It's a file
HiddenOrVisible = (Brw_TypeIsSeeDoc[Gbl.FileBrowser.Type] ||
Brw_TypeIsSeeMrk[Gbl.FileBrowser.Type]) ? Brw_CheckIfFileOrFolderIsSetAsHiddenInDB (FileType,
PathFileInTree) :
HidVis_VISIBLE;
if (HiddenOrVisible == HidVis_VISIBLE) // If file/folder is visible
switch (FileType)
{
case Brw_IS_FOLDER:
FullSize += (unsigned long long) FileStatus.st_size;
/***** Create clone of subdirectory *****/
if (mkdir (PathFileClone,(mode_t) 0xFFF))
Err_ShowErrorAndExit ("Can not create temporary subfolder for compression.");
/***** Clone subtree starting at this this directory *****/
FullSize += ZIP_CloneDir (PathFile,PathFileClone,PathFileInTree);
break;
case Brw_IS_FILE:
case Brw_IS_LINK:
FullSize += (unsigned long long) FileStatus.st_size;
/***** Create a symbolic link (clone) to original file *****/
if (symlink (PathFile,PathFileClone) != 0)
Err_ShowErrorAndExit ("Can not create temporary link for compression.");
/***** Update number of my views of this file *****/
Brw_UpdateMyFileViews (Brw_DB_GetFilCodByPath (PathFileInTree,false)); // Any file, public or not
break;
default:
break;
}
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}
}
else
Err_ShowErrorAndExit ("Error while scanning directory.");
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return FullSize;
}
/*****************************************************************************/
/********************* Show link to download a ZIP file **********************/
/*****************************************************************************/
static void ZIP_ShowLinkToDownloadZIP (const char *FileName,const char *URL,
off_t FileSize,unsigned long long UncompressedSize)
{
extern const char *Txt_ZIP_file;
extern const char *Txt_Download;
extern const char *Txt_Filename;
extern const char *Txt_File_size;
extern const char *Txt_FILE_uncompressed;
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char FileSizeStr[Fil_MAX_BYTES_FILE_SIZE_STRING + 1];
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/***** Begin box and table *****/
Box_BoxTableShadowBegin (NULL, NULL,NULL,NULL,2);
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/***** Link to download the file *****/
HTM_TR_Begin (NULL);
HTM_TD_Begin ("colspan=\"2\" class=\"FILENAME_BIG CM\"");
HTM_A_Begin ("href=\"%s\" class=\"FILENAME_BIG\" title=\"%s\" target=\"_blank\"",
URL,FileName);
HTM_IMG (CfG_URL_ICON_FILEXT_PUBLIC "32x32","zip32x32.gif",Txt_ZIP_file,
"class=\"ICO40x40\"");
HTM_NBSP ();
HTM_Txt (FileName);
HTM_NBSP ();
Ico_PutIcon ("download.svg",Ico_BLACK,Txt_Download,"ICO40x40");
HTM_A_End ();
HTM_TD_End ();
HTM_TR_End ();
/***** Filename *****/
HTM_TR_Begin (NULL);
HTM_TD_Begin ("class=\"RM FORM_IN_%s\"",The_GetSuffix ());
HTM_TxtColon (Txt_Filename);
HTM_TD_End ();
HTM_TD_Begin ("class=\"LM DAT_%s\"",The_GetSuffix ());
HTM_A_Begin ("href=\"%s\" title=\"%s\" target=\"_blank\""
" class=\"DAT_%s\"",
URL,FileName,The_GetSuffix ());
HTM_Txt (FileName);
HTM_A_End ();
HTM_TD_End ();
HTM_TR_End ();
/***** Write the file size *****/
Fil_WriteFileSizeFull ((double) FileSize,FileSizeStr);
HTM_TR_Begin (NULL);
HTM_TD_Begin ("class=\"RM FORM_IN_%s\"",The_GetSuffix ());
HTM_TxtColon (Txt_File_size);
HTM_TD_End ();
HTM_TD_Begin ("class=\"LM DAT_%s\"",The_GetSuffix ());
HTM_Txt (FileSizeStr);
if (UncompressedSize)
{
Fil_WriteFileSizeFull ((double) UncompressedSize,FileSizeStr);
HTM_TxtF (" (%s %s)",FileSizeStr,Txt_FILE_uncompressed);
}
HTM_TD_End ();
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HTM_TR_End ();
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/***** End table and box *****/
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Box_BoxTableEnd ();
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}