426 lines
15 KiB
PHP
426 lines
15 KiB
PHP
<?php
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//load the database functions
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require('db.php');
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/* the function which verifies a user's credentials
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against the database */
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function login ()
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{
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session_start();
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if (isset($_REQUEST['username'])) {
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global $con;
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/* assign the variables with data from the login form */
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$username = stripslashes($_REQUEST['username']);
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//escapes special characters in a string
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$username = mysqli_real_escape_string($con,$username);
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global $current_user;
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$current_user = $username;
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$password = stripslashes($_REQUEST['password']);
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$password = mysqli_real_escape_string($con,$password);
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//check the form data against the database
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$query = "SELECT * FROM users WHERE userLogin='$username'
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and userPass='$password'";
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$result = mysqli_query($con,$query) or die(mysqli_error());
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/* forward the user to the home.php page if the login is correct
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otherwise prompt an error message*/
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$rows = mysqli_num_rows($result);
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if ($rows==1) {
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$_SESSION['username'] = $username;
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// Redirect user to home.php
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header("Location: home.php");
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} else {
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echo "<h3>Username/password is incorrect.</h3>";
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}
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}
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}
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// A function to register a new user
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function register ()
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{
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if (isset($_REQUEST['username'])) {
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global $con;
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/* assign the variables with data from the login form */
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// removes backslashes
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$username = stripslashes($_REQUEST['username']);
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//escapes special characters in a string
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$username = mysqli_real_escape_string($con,$username);
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$email = stripslashes($_REQUEST['email']);
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$email = mysqli_real_escape_string($con,$email);
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$password = stripslashes($_REQUEST['password']);
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$password = mysqli_real_escape_string($con,$password);
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/* create a new user entry inside the database */
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$query = "INSERT into users (userLogin, userPass, userEmail)
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VALUES ('$username', '$password', '$email')";
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$result = mysqli_query($con,$query);
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/* tell the user if the username or the email address are
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already present in the database based on the return code
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of the database*/
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if ($result) {
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echo "<div class='form'>
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<h3>You are registered successfully.</h3>
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<br/>Click here to <a href='index.php'>Login</a></div>";
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} elseif (mysqli_errno($con) == 1062) {
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echo "<h3>Username or Email already taken.</h3>";
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}
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}
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}
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/*A function to get the userId from the database for the current
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logged in user based on the username used to login*/
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function get_userid ()
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{
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global $con;
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session_start();
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$username = $_SESSION['username'];
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$sql = "select userId from users where userLogin = '$username'";
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$userId = mysqli_query($con, $sql) or die(mysqli_error($con));
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$row = $userId->fetch_object();
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return $row->userId;
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}
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// A function to post a demand
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function post_demand ()
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{
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if (isset($_POST['submit'])) {
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global $con;
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$userId = get_userid();
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/* assign the variables with data from the demand form */
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$piecesMax = $_POST['piecesMax'];
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$piecesMin = $_POST['piecesMin'];
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$qualityId = $_POST['quality'];
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$deliveryDate = $_POST['deliveryDate'];
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$title = $_POST['title'];
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$text = $_POST['text'];
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/* check if the values make sense before adding them to
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the databse */
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if ($piecesMax <= $piecesMin) {
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echo "<strong class='warning'>
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The Maximum must be bigger than the Minimum!
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</strong>";
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} else {
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$sql = "INSERT INTO demands (piecesMax, piecesMin, demandText,
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demandTitle, userId, deliveryDate,
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qualityId)
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VALUES ('$piecesMax', '$piecesMin', '$text', '$title',
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'$userId', '$deliveryDate', '$qualityId')";
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$result = mysqli_query($con, $sql) or die(mysqli_error($con));
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}
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}
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}
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// A function to insert the demand titles from the database into the website
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function get_demand_titles ()
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{
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global $con;
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//get the data from the database
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$sql = "SELECT * FROM demands";
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$result = mysqli_query($con, $sql);
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/*fetch the data from the $result array and insert it into
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the corresponding HTML code */
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while ($row = $result->fetch_assoc()) {
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echo "<div class='post-box'><p>";
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echo "<strong>" . $row['demandTitle'] . "</strong>" . "<br>";
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echo $row['date'] . "<br>";
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//add a delete button to the demand output
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echo "<form class= 'delete-form' method= 'POST'
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action='".delete_demand()."'>
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<input type='hidden' name='demandId' value='".$row['demandId']."'>
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<button type='submit' name= 'deletepost'> Delete</button>
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</form>";
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/*add a button to the demand output which let's the user view
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the demand details */
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echo "<form method= 'POST' action='show_demand.php'>
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<input type='hidden' name='demandId' value='".$row['demandId']."'>
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<button>Show Details</button>
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</form>";
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/* add an edit button to the demand output and give it the
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necessary data to edit. */
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echo "<form class= 'edit-form' method= 'POST' action='edit_demand.php'>
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<input type='hidden' name='userId' value='".$row['userId']."'>
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<input type='hidden' name='demandId' value='".$row['demandId']."'>
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<input type='hidden' name='piecesMax' value='".$row['piecesMax']."'>
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<input type='hidden' name='piecesMin' value='".$row['piecesMin']."'>
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<input type='hidden' name='deliveryDate' value='".$row['deliveryDate']."'>
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<input type='hidden' name='title' value='".$row['demandTitle']."'>
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<input type='hidden' name='text' value='".$row['demandText']."'>
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<button>Edit</button>
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</form>
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</div>";
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}
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}
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// A function to edit a demand
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function edit_demand ()
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{
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if (isset($_POST['edit'])) {
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global $con;
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/* assign the variables with data from the edit button */
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$demandId = $_POST['demandId'];
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$piecesMax = $_POST['piecesMax'];
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$piecesMin = $_POST['piecesMin'];
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$deliveryDate = $_POST['deliveryDate'];
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$title = $_POST['title'];
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$text = $_POST['text'];
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/* Inserts the updates into the database if the values
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make sense otherwise inform the user about his error*/
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if ($piecesMax <= $piecesMin) {
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echo "<strong class='warning'>
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The Maximum must be bigger than the Minimum!
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</strong>";
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} else {
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$sql = "UPDATE demands
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SET piecesMax='$piecesMax',
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piecesMin='$piecesMin',
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demandTitle='$title',
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demandText='$text',
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deliveryDate='$deliveryDate'
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WHERE demandId='$demandId'";
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$result = mysqli_query($con, $sql) or die(mysqli_error($con));
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header("Location: board.php");
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}
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}
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}
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// A function to delete a post
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function delete_demand()
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{
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if (isset($_POST['deletepost'])) {
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global $con;
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/* assign the variable with data from the delete button */
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$demandId = $_POST['demandId'];
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/* Delete all the offers corresponding to the demandId
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from the database */
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$delete_offers_query = "DELETE FROM offers WHERE demandId='$demandId'";
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$delete_offers_result = mysqli_query($con, $delete_offers_query)
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or die(mysqli_error($con));
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// Delete the demand matching the demandId from the database
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$delete_demand_query = "DELETE FROM demands WHERE demandId='$demandId'";
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$delete_demand_result = mysqli_query($con, $delete_demand_query)
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or die(mysqli_error($con));
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header('Location: board.php');
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}
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}
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//a function to show a demand's details
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function show_demand ()
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{
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global $con;
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/* assign the variable with data from the details button */
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$demandId = $_POST['demandId'];
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//get the corresponding data from the database
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$demand_query = "SELECT * FROM demands where demandId='$demandId'";
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$demand_query_result = mysqli_query($con, $demand_query) or
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die(mysqli_error($con));
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$demand_rows = $demand_query_result->fetch_object();
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//get the quality requested in the demand from the database
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$qualityId = $demand_rows->qualityId;
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$quality_query = "SELECT * FROM quality where qualityId='$qualityId'";
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$quality_query_result = mysqli_query($con, $quality_query) or
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die(mysqli_error($con));
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$quality_rows = $quality_query_result->fetch_object();
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//print the demand details
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echo "<h2>" . $demand_rows->demandTitle . "</h2>";
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echo "<br>
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<br>";
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echo "<strong>Maximum required pieces: </strong>" . $demand_rows->piecesMax;
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echo "<br>
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<br>";
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echo "<strong>Minimum required pieces: </strong>" . $demand_rows->piecesMin;
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echo "<br>
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<br>";
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echo "<strong>Desired Date of Delivery: </strong>".
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$demand_rows->deliveryDate;
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echo "<br>
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<br>";
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echo "<strong>Desired Quality: </strong>" . $quality_rows->qualityName;
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echo "<br>
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<br>
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<strong>Description:</strong><br>";
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echo "$demand_rows->demandText<br><br>";
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/*add a "Post Offer" button to the demand's details to let a user
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post an offer */
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echo "<form method= 'POST' action='add_offer.php'>
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<input type='hidden' name='demandId' value='$demand_rows->demandId'>
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<button>Post Offer</button>
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</form><br>";
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}
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//A function to post an offer to a demand
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function post_offer()
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{
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if (isset($_POST['submit'])) {
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global $con;
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//get the current user's ID
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$userId = get_userid();
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/* assign the variables with data from the "Post Offer" form*/
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$demandId = $_POST['demandId'];
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$pieces = $_POST['pieces'];
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$price = $_POST['price'];
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$qualityId = $_POST['quality'];
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$text = $_POST['text'];
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// Insert the offer into the database
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$sql = "INSERT INTO offers (pieces, text, price, userId, qualityId,
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demandId)
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VALUES ('$pieces', '$text', '$price', '$userId', '$qualityId',
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'$demandId')";
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$result = mysqli_query($con, $sql) or die(mysqli_error($con));
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header('Location: board.php');
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}
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}
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//A function to print out the offers to a demand
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function show_offer ()
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{
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global $con;
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/* assign the variables with data from demand*/
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$demandId = $_POST['demandId'];
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// get the offers matching the demand from the database
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$offer_query = "SELECT * FROM offers where demandId='$demandId'";
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$offer_query_result = mysqli_query($con, $offer_query) or
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die(mysqli_error($con));
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// if the query on the database returned data print the data
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while ($offer_rows = $offer_query_result->fetch_object()) {
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//get the corresponding quality data from the database
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$qualityId = $offer_rows->qualityId;
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$quality_query = "SELECT * FROM quality where qualityId='$qualityId'";
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$quality_query_result = mysqli_query($con, $quality_query) or
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die(mysqli_error($con));
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$quality_rows = $quality_query_result->fetch_object();
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echo "<strong>Offer Nr: </strong>" . $offer_rows->offerId;
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echo "<br>
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<br>";
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echo "<strong>Amount available: </strong>" . $offer_rows->pieces;
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echo "<br>
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<br>";
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echo "<strong>Price per piece: </strong>" . $offer_rows->price;
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echo "<br>
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<br>";
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echo "<strong>Provided Quality: </strong>" . $quality_rows->qualityName;
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echo "<br>
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<br>
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<strong>Description:</strong><br>";
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echo $offer_rows->text . "<br><br>";
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/*Add a button to each offer which let's the user export the offer*/
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echo "<form method= 'POST' action='export_offer.php'>
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<input type='hidden' name='offerId' value='$offer_rows->offerId'>
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<button>Export this Offer</button>
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</form>";
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//add a delete button to the offer output
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echo "<form method= 'POST' action='".delete_offer()."'>
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<input type='hidden' name='offerId' value='$offer_rows->offerId'>
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<input type='hidden' name='demandId' value='$demandId'>
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<button type='submit' name= 'delete_offer'> Delete</button>
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</form><hr>";
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}
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}
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function delete_offer()
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{
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if (isset($_POST['delete_offer'])) {
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global $con;
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/* assign the variable with data from the delete button */
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$offerId = $_POST['offerId'];
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$demandId = $_POST['demandId'];
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/* Delete the offer corresponding to the offerid*/
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$delete_offers_query = "DELETE FROM offers WHERE offerId='$offerId'";
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$delete_offers_result = mysqli_query($con, $delete_offers_query)
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or die(mysqli_error($con));
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header('Location: board.php');
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}
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}
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//A function which exports an offer to XML
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function export_offer ()
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{
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global $con;
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/* assign the variable with data from "Export Offer" button*/
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$offerId = $_POST['offerId'];
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/*get the offer and all it's related the data from the database*/
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$offer_export_query = "SELECT o.offerId,
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o.text,
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o.price,
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o.date,
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o.pieces,
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q.qualityName,
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d.demandTitle
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FROM offers o
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INNER JOIN demands d
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on o.demandId = d.demandId
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INNER JOIN quality q
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on o.qualityId = q.qualityId
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WHERE o.offerId = '$offerId';";
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$query_result = mysqli_query($con, $offer_export_query) or
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die(mysqli_error($con));
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$export_rows = $query_result->fetch_object();
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//create a dom document with encoding utf8
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$domtree = new DOMDocument('1.0', 'UTF-8');
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/* create the root element of the xml tree and append it to
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the dom document*/
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$xmlRoot = $domtree->createElement("offer");
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$offer_export = $domtree->appendChild($xmlRoot);
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//add the offer fields as child elements to the XML
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$offer_export->appendChild(
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$domtree->createElement('demand_title',$export_rows->demandTitle));
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$offer_export->appendChild(
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$domtree->createElement('offer_id',$export_rows->offerId));
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$offer_export->appendChild(
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$domtree->createElement('offer_text',$export_rows->text));
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$offer_export->appendChild(
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$domtree->createElement('offer_price',$export_rows->price));
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$offer_export->appendChild(
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$domtree->createElement('offer_pieces',$export_rows->pieces));
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$offer_export->appendChild(
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$domtree->createElement('offer_quality',$export_rows->qualityName));
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$offer_export->appendChild(
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$domtree->createElement('offer_date',$export_rows->date));
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// format the dom document
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$domtree->formatOutput = true;
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// print out the generate dom document
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echo $domtree->saveXML();
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}
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?>
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