User Database Authentication & Registration

TUTORIAL 6 ATTACHMENT

Here it is as promised.

You are going to need to get used to using header files for larger programs

The files for this program are as follows:

1. authfunctions.h
2. main.cpp
3. user.db

User Database 1.0

authfunctions.h

This file will contain all of the programs major functions
The contents are as follows:

#include <iostream>
#include <string>
#include <sstream>
#include <iterator>
#include <vector>
#include <fstream>
using namespace std;
int register_user()
{
	system("cls");
	string uzr, paz;
	cout << "Authentication Database Program 1.0\n"
		 << "~~~~~~~~~~~~Registration~~~~~~~~~~~~\n"
		 << "									 \n"
		 << "~Desired Username: ";
	cin >> uzr;
	cout << "~Desired Password: "; 
	cin >> paz;
	//SEARCH TO SEE IF THE USER EXISTS
	//IF NOT IN DB, THEN ADD USER TO DB, IF IN DB, CLOSE.
	fstream authfile;
	authfile.open("user.db");
	if(authfile.is_open())
	{
		vector<string> filelines;
		string procstring;
		while(getline(authfile,procstring))
		{
			filelines.push_back(procstring);
		}
		stringstream uss(filelines[0]);//Users stream
		stringstream pss(filelines[1]);//Paswords stream
		istream_iterator<string> ubegin(uss), uend;//Users iterators
		istream_iterator<string> pbegin(pss), pend;//Passwords iterators
		vector<string> users(ubegin, uend); //Where we store every user
		vector<string> passwords(pbegin, pend); //Where we store every password.
		bool alreadyexists = false;
		for(int i=0; i<users.size();i++)//Do this while we haven't parsed the entire database
		{
			if(uzr == users[i])
			{
				alreadyexists = true;
				break;
			}
		}
		if(alreadyexists == true)
		{
			cout << "This username already exists.\n";
			system("pause");
			system("cls");
			authfile.close(); //Never leave a file open when you stop using it.
		}
		else
		{
			authfile.close(); //Closing the read stream
			authfile.open("user.db"); //Opening the write stream
			users.push_back(uzr);
			passwords.push_back(paz);
			string userline, passwordline;
			for(int i = 0; i<users.size(); i++)
			{
				userline = userline + users[i] + " ";
			}
			for(int i = 0; i<passwords.size(); i++)
			{
				passwordline = passwordline + passwords[i] + " ";
			}
			authfile << userline << "\n" << passwordline;
			authfile.close();
			system("pause");
			system("cls");
		}
		
	}
	else
	{
		cout << "Fatal Error: Can't connect to database!\n";
		system("pause");
	}
}
int auth(string u, string p)
{
	bool authstate = false;
	fstream authfile;
	authfile.open("user.db");
	if(authfile.is_open())
	{   
		vector<string> filelines;
		string procstring;
		while(getline(authfile,procstring))
		{
			filelines.push_back(procstring);
		}
		stringstream uss(filelines[0]);//Users stream
		stringstream pss(filelines[1]);//Paswords stream
		istream_iterator<string> ubegin(uss), uend;//Users iterators
		istream_iterator<string> pbegin(pss), pend;//Passwords iterators
		vector<string> users(ubegin, uend); //Where we store every user
		vector<string> passwords(pbegin, pend); //Where we store every password.
		for(int i=0; i<users.size() || i<passwords.size();i++)//Do this while we haven't parsed the entire database
		{
			if(u == users[i] && p == passwords[i])
			{
				authfile.close();
				authstate = true;
				break;
			} 
		}
	}
	else
	{
		cout << "MAJOR ERROR Could not connect to database!\n";
	}
	return authstate;
}
int list()
{
	bool exit = false;
	list:
	system("cls");
	cout << "Welcome to our informational databse!\n1. Contacts\n2. Passwords\n3. Notes\n";
	cout << "Choose an option from the list above (ex: 1) or 0 to exit!\nYour choice: \n";
	int option;
	cin >> option;
	switch(option) 
	{
		case 0:
			{
				system("cls");
				cout << "Bye!\n";
				exit = true;
				break;
			}
		case 1:	   
			{	   
			    system("cls");
				cout << "~Contact List~\n"
				     << "Name    Phone\nAmy     40003231\nJoe     40003231\n"
				     << "John    40003231" << endl;
				     break; 
			}               
		case 2:
			{
				system("cls");
				cout << "      ~My Password list~\n"
					 << "_______________________________\n"
					 << "|Website           | Password |" << endl
					 << "|==================|==========|" << endl
					 << "|www.gmail.com     | fluffy01 |\n"
					 << "|------------------|----------|\n"
					 << "|www.facebook.com  | 01234567 |\n"
					 << "|------------------|----------|\n"
					 << "|www.steemit.com   | hawh2h8a |\n"
					 << "|__________________|__________|\n";
					 break; 
			}
		case 3:
			{
				system("cls");
				cout << "~My notes - Read them~\n"
					 << "Note 1: Remember to feed your pets\n"
					 << "Note 2: Remember to add a ; to every line that finishes an instruction\n"
					 << "Note 3: Remember to follow me if you like my tutorials\n"
					 << "Note 4: Don't forget to add a break after each case in switches!\n"
					 << "Note 5: Don't forget to add a \\n after each comment so the text displays properly\n"
					 << "Note 6: Notice that one \\ in front of a newline inside a comment escapes the newline\n"
					 << "Note 7: If my tutorial is helping you please like, follow and even resteem it so you can help me aswell!\n";
					 break;
				
			}
		default:   
			{	   
				cout << "There is no such option!\n";
				system("pause");
				break;
			}
	}
	system("pause");
	if(exit == false)
	{
			goto list;
	}
}

user.db

Create this with notepad.
This is our user database, the first line contains users, the second line contains passwords.
make sure it contains the following:

admin
1234

main.cpp

Here we run all of our functions together. The contents of main.cpp should be:

#include "authfunctions.h"
int main()
{
	bool exitprogram = false;
	authdb:
	system("cls");
	cout << "Authentication Database Program 1.0\n"
		 << "What would you like to do?\n"
		 << "1) Login\n2) Register\n"
		 << "Select one of the options above or enter 0 to exit.\n"; 
	int swc;
	cin >> swc;
	switch(swc)
	{
	case 1:
	{
		system("cls");
		string u, p;
		cout << "Authentication Database Program 1.0\n"
			 << "Please enter your credentials.\n"
			 << "Username: ";
		cin >> u;
		cout << "Password: ";
		cin >> p;
		if(auth(u, p))
		{			  
			cout << "Authentication Success!\n";
			system("pause");
			list();
			exitprogram = true;
		}
		else
		{
			cout << "Authentication Failure!\n";
			system("pause");
		}
		break;
	}
	case 2:
	{
		register_user();
		break;
	}
	case 0:
	{
		system("cls");
		cout << "Bye!";
		exitprogram = true;
	}
	}
	if(exitprogram == false)
	{
		goto authdb;
	}
	return 0;
}

Now you just have to make sure the header is added to your project in the compiler & make sure user.db is in the same directory as main.exe.

Compile & Run - Enjoy.

As always. I hope you enjoyed my tutorial, Upvote & Follow or even resteem if you liked it & feel free to ask me anything in the comments below!

The header is of my own design.
Everything written here is my own work.
Feel free to comment I'd love to hear your opinions!
List of images that are public domain:
acgranted