From 8bca2f7e966883cd1e73bf8df384a0aa21a271ba Mon Sep 17 00:00:00 2001
From: arf20 <aruizfernandez05@gmail.com>
Date: Fri, 15 Mar 2024 04:04:16 +0100
Subject: Initial commit

---
 login.php | 130 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100755 login.php

(limited to 'login.php')

diff --git a/login.php b/login.php
new file mode 100755
index 0000000..c26b2e7
--- /dev/null
+++ b/login.php
@@ -0,0 +1,130 @@
+<?php
+// Initialize the session
+session_start();
+ 
+// Check if the user is already logged in, if yes then redirect him to welcome page
+if(isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true){
+    header("location: welcome.php");
+    exit;
+}
+ 
+// Include config file
+require_once "config.php";
+ 
+// Define variables and initialize with empty values
+$username = $password = "";
+$username_err = $password_err = "";
+ 
+// Processing form data when form is submitted
+if($_SERVER["REQUEST_METHOD"] == "POST"){
+    // Validate username
+    if(empty(trim($_POST["username"]))){
+        $username_err = "Please enter username.";
+    } else{
+		if (preg_match("[a-zA-Z0-9_]+", $_POST["username"]) == 1) {
+			$username_err = "Invalid username.";
+		}
+		else {
+			$username = trim($_POST["username"]);
+		}
+    }
+    
+    // Validated password
+    if(empty(trim($_POST["password"]))){
+        $password_err = "Please enter your password.";
+    } else{
+		if (preg_match("[a-zA-Z0-9_]+", $_POST["password"]) == 1) {
+			$username_err = "Invalid password.";
+		}
+		else {
+			$password = trim($_POST["password"]);
+		}
+    }
+    
+    // Validate credentials
+    if(empty($username_err) && empty($password_err)){
+        // Prepare a select statement
+        $sql = "SELECT id, username, password FROM users WHERE username = ?";
+        
+        if($stmt = mysqli_prepare($link, $sql)){
+            // Bind variables to the prepared statement as parameters
+            mysqli_stmt_bind_param($stmt, "s", $param_username);
+            
+            // Set parameters
+            $param_username = $username;
+            
+            // Attempt to execute the prepared statement
+            if(mysqli_stmt_execute($stmt)){
+                // Store result
+                mysqli_stmt_store_result($stmt);
+                
+                // Check if username exists, if yes then verify password
+                if(mysqli_stmt_num_rows($stmt) == 1){                    
+                    // Bind result variables
+                    mysqli_stmt_bind_result($stmt, $id, $username, $hashed_password);
+                    if(mysqli_stmt_fetch($stmt)){
+                        if(password_verify($password, $hashed_password)){
+                            // Password is correct, so start a new session
+                            session_start();
+                            
+                            // Store data in session variables
+                            $_SESSION["loggedin"] = true;
+                            $_SESSION["id"] = $id;
+                            $_SESSION["username"] = $username;                            
+                            
+                            // Redirect user to welcome page
+                            header("location: welcome.php");
+                        } else{
+                            // Display an error message if password is not valid
+                            $password_err = "The password you entered was not valid.";
+                        }
+                    }
+                } else{
+                    // Display an error message if username doesn't exist
+                    $username_err = "No account found with that username.";
+                }
+            } else{
+                echo "Oops! Something went wrong. Please try again later.";
+            }
+
+            // Close statement
+            mysqli_stmt_close($stmt);
+        }
+    }
+    
+    // Close connection
+    mysqli_close($link);
+}
+?>
+ 
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>Login</title>
+    <link rel="stylesheet" type="text/css" href="arfCloud.css">
+	<link rel="stylesheet" type="text/css" href="/style.css">
+</head>
+<body>
+    <div class="wrapper">
+        <h2>arfCloud Login</h2>
+		<p>For those who don't want their data sold by Google</p>
+        <form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
+            <div class="form-group row <?php echo (!empty($username_err)) ? 'has-error' : ''; ?>">
+                <div class="column"><label>Username</label></div>
+                <div class="column"><input type="text" name="username" class="form-control" pattern="[a-zA-Z0-9_]+" value="<?php echo $username; ?>"></div>
+                <span class="help-block"><?php echo $username_err; ?></span>
+            </div>    
+            <div class="form-group row <?php echo (!empty($password_err)) ? 'has-error' : ''; ?>">
+                <div class="column"><label>Password</label></div>
+                <div class="column"><input type="password" name="password" pattern="[a-zA-Z0-9_]+" class="form-control"></div>
+                <span class="help-block"><?php echo $password_err; ?></span>
+            </div>
+            <div class="form-group">
+                <input type="submit" class="btn btn-primary" value="Login">
+            </div>
+            <p>Don't have an account? <a href="register.php">Sign up now</a>.</p>
+        </form>
+    </div>    
+</body>
+</html>
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