From 320f0cc1d11f904ccbcc6605f73f48b822bd13bc Mon Sep 17 00:00:00 2001
From: Sagi Dayan <sagidayan@gmail.com>
Date: Tue, 17 Jun 2014 22:15:38 +0300
Subject: [PATCH] Added SavedData Class

under /src/data/
passed all my testing!

commiting only this class with no changes within the rest of the
project!
---
 jceGrade.pro          |   4 +-
 src/data/savedata.cpp | 200 ++++++++++++++++++++++++++++++++++++++++++
 src/data/savedata.h   |  54 ++++++++++++
 3 files changed, 257 insertions(+), 1 deletion(-)
 create mode 100644 src/data/savedata.cpp
 create mode 100644 src/data/savedata.h

diff --git a/jceGrade.pro b/jceGrade.pro
index 36ac194..7843e80 100644
--- a/jceGrade.pro
+++ b/jceGrade.pro
@@ -22,7 +22,8 @@ SOURCES +=     main/coursestablemanager.cpp \
     src/grades/GradePage.cpp \
     src/grades/Page.cpp \
     src/jce/jcedate.cpp \
-    src/jce/jcelogin.cpp
+    src/jce/jcelogin.cpp \
+    src/data/savedata.cpp
 
 
 
@@ -37,6 +38,7 @@ HEADERS  +=     main/coursestablemanager.h \
     src/jce/jcedate.h \
     src/jce/jcelogin.h \
     src/jce/jceLoginHtmlScripts.h \
+    src/data/savedata.h
 
 
 
diff --git a/src/data/savedata.cpp b/src/data/savedata.cpp
new file mode 100644
index 0000000..89900da
--- /dev/null
+++ b/src/data/savedata.cpp
@@ -0,0 +1,200 @@
+#include "savedata.h"
+
+
+
+/**
+ * @brief Checks the status tag in the file
+ * @return boolean the status
+ */
+bool SaveData::isSaved()
+{
+    QString status;
+    QFile* file = new QFile(FILE_NAME);
+    /* Opening file for read */
+    if(file->open(QIODevice::ReadOnly|QIODevice::Text))
+    {
+        status = getValViaTag("status", file);
+        if(status == "true")
+        {
+            file->close(); //close & return
+            return true;
+        }
+        return false; //close & return
+        file->close();
+    }
+    /* If Faild to open */
+    std::cout << "Faild To Accsess file: " << FILE_NAME << std::endl;
+    return false;
+}
+
+
+/**
+ * @brief This Function will modify the file, and save the data.
+ * @param username - QString
+ * @param password - QString
+ * @return true if saved - false if error
+ */
+bool SaveData::save(QString username, QString password)
+{
+    std::cout << "Trying to save data..." << std::endl;
+    QFile file(FILE_NAME);
+    if(!file.open(QIODevice::WriteOnly|QIODevice::Text))
+        return false; /* IO Error! */
+    QTextStream output(&file);
+    QString hash_pass = hashPassword(password);
+    output << "[status]true[/]\n[username]"<<username<<"[/]\n"<<"[password]"<<hash_pass<<"[/]"; //Un Hashed Password in string!
+    file.close();
+    std::cout << "Saved!" << std::endl;
+    return true;
+}
+
+/**
+ * @brief Deletes the data from file, and sets status tag to false.
+ * @return true if success
+ */
+bool SaveData::deleteData()
+{
+    QFile file(FILE_NAME);
+    if(!file.open(QIODevice::WriteOnly|QIODevice::Text))
+        return false; /* IO Error! */
+    QTextStream output(&file);
+    output << DEFAULT_DATA_EMPTY;
+    file.close();
+    return true;
+}
+
+/**
+ * @brief username getter
+ * @return QString - username
+ */
+QString SaveData::getUsername()
+{
+    QString username = "";
+    QFile* file = new QFile(FILE_NAME);
+
+    /* Opening file for read */
+    if(file->open(QIODevice::ReadOnly|QIODevice::Text))
+        username = getValViaTag("username", file);
+    file->close();
+    return username;
+
+}
+
+/**
+ * @brief getter for password
+ * @return QString - password
+ */
+QString SaveData::getPassword()
+{
+    QString pass = "";
+    QFile* file = new QFile(FILE_NAME);
+    /* Opening file for read */
+    if(file->open(QIODevice::ReadOnly|QIODevice::Text))
+            pass = getValViaTag("password", file);
+    file->close();
+   pass = deHashPasword(pass);
+    return pass;
+
+}
+
+/**
+ * @brief This is A functions that will init the tags file.
+ * if it exist - do nothing
+ * if there is no file, it will create it and run the deleteData function
+ * so tags will be set.
+ */
+void SaveData::init()
+{
+    QFile file(FILE_NAME);
+    if(!file.exists())
+    {
+         file.open(QIODevice::ReadWrite | QIODevice::Text);
+         file.close();
+         deleteData();
+    }
+}
+
+/**
+ * @brief This function will return the vale of a given tag name.
+ * NOTE:    valid tag names are : "status", "username", "password"
+ *          if tag is invalid - will return "" - an empty QString!
+ * @param tag - QString, the tag name
+ * @param file - a QFile pointer
+ * @return  QString - the value in tag
+ *          NOTE: if NULL value, or an invalid tag name -> return "" (empty QString!)
+ */
+QString SaveData::getValViaTag(QString tag, QFile* file)
+{
+    QString val, line , tmpTag;
+    QTextStream textStream( file);
+    while((line = textStream.readLine()) != NULL)
+    {
+        std::cout << "DEBUG: line => " << line.toStdString() << std::endl;
+        for(int i = 0 ; i< line.length() ;++i)
+        {
+            if(line[i] == '[' && line[i+1] != '/') //get open tag at begining of line and not end of tag ("[/")
+            {
+                i++;
+                tmpTag = line.mid(i, tag.length());
+                if(tmpTag == tag)
+                {
+                    i+= tag.length()+1; // i is now right after '['
+                    int j = i;
+                    while(line[j] != '[')// put j at the end of the value
+                        j++;
+                    /* Then... the value is :*/
+                    val = line.mid(i, j-i);
+                    std::cout << "DEBUG:  ["<<tag.toStdString()<<"]"<<val.toStdString()<<"[/]"<<std::endl;
+                    return val;
+                }
+            }
+        }
+    }
+    return ""; //this will be as NULL
+}
+
+/**
+ * @brief   This function will provide the user the most basic security of the stored password.
+ *          it is NOT an encryption! it will store every char of the password as ascii encoded,
+ *          separated by "-" for the deHsh func.
+ * @param pass - a QString to "hash"
+ * @return QString - The "hashed" password
+ */
+QString SaveData::hashPassword(QString pass)
+{
+    QString hash="";
+    int code;
+    for(QChar c : pass)
+    {
+        code = (int)c.toLatin1();
+        hash.append(QString::number(code));
+        hash.append("-");
+    }
+    return hash;
+}
+
+
+/**
+ * @brief   This function will "dehash" the "hashed" password.
+ *          uses standard c string.h strtok with the "-" as the choping points.
+ *          builds a QString from the ascii.
+ * @param pass - The hashed password
+ * @return QString - password uncoded
+ */
+QString SaveData::deHashPasword(QString pass)
+{
+    char* cpyPass = strdup(pass.toStdString().c_str());
+    char* tok;
+    char* ch;
+    int val;
+    QString password;
+    tok = strtok(cpyPass,"-");
+    while (tok != NULL)
+    {
+        ch = tok;
+        val = atoi(ch);
+        password.append(val);
+        tok = strtok(NULL, "-");
+    }
+    return password;
+}
diff --git a/src/data/savedata.h b/src/data/savedata.h
new file mode 100644
index 0000000..27015c9
--- /dev/null
+++ b/src/data/savedata.h
@@ -0,0 +1,54 @@
+#ifndef SAVEDATA_H
+#define SAVEDATA_H
+
+/**
+ *	SaveData Class 
+ * --------------------------------------
+ * 
+ * all functions in this class are static!
+ * no need to create an object!
+ * 
+ * provides all the needed functions
+ * for saving user data for JCE login.
+ *
+ * the class will enteract with a file formated by tags for storing the valus.
+ * the file format is as sutch:
+ * 
+ * 		[status]Status Value[/]
+ * 		[username]usernaem vale[/]
+ * 		[password]hashed(not really) password vale[/]
+ *
+ * the class will create a file if not exists by calling Save Data::init() function.
+ *
+ * for more info about functions - see implantation
+ */
+
+/* QT libs */
+#include <QString>
+#include <QFile>
+#include <QTextStream>
+
+/* C/C++ libs */
+#include <string.h>
+#include <stdlib.h>
+#include <iostream>
+
+#define FILE_NAME   "JAC_DB.dat"
+#define DEFAULT_DATA_EMPTY "[status]false[/]\n[username][/]\n[password][/]"
+
+class SaveData
+{
+public:
+    bool static isSaved();
+    bool static save(QString username, QString password);
+    bool static deleteData();
+    QString static getUsername();
+    QString static getPassword();
+    void static init();
+private:
+    QString static getValViaTag(QString tag, QFile *file);
+    QString static hashPassword(QString pass);
+    QString static deHashPasword(QString pass);
+};
+
+#endif // SAVEDATA_H