Improve forgot password screen (step 1)

gatherling/forgot.php

@@ -1,17 +1,74 @@
 <?php
+
+use Gatherling\Player;
+
 include 'lib.php';
+require_once 'lib_form_helper.php';
+
 session_start();
 print_header('Login');
+printPageHeader();
+
+if (isset($_POST['view']) && $_POST['view'] === 'send_login_link') {
+    if (isset($_POST['identifier']) && strpos($_POST['identifier'], '@') !== false) {
+        $player = Player::findByEmail($_POST['identifier']);
+    } else {
+        $player = Player::findByName($_POST['identifier']);
+    }
+    if ($player) {
+        $email = $player->emailPrivacy ? "your registered email" : $player->emailAddress;
+        if (sendLoginLink($player)) {
+            echo '<p>A link has been sent to ' . htmlentities($email) . '</p>';
+        } else {
+            echo '<p class="error">Unable to send a link to ' . htmlentities($email) . '</p>';
+            printForgotForm();
+        }
+    } else {
+        echo '<p class="error">Unable to find a player with that email or username</p>';
+        printForgotForm();
+    }
+} else {
+    printForgotForm();
+}
+
+printPageFooter();
+print_footer();
+
+function printPageHeader() {
+    ?>
+    <div class="grid_10 suffix_1 prefix_1">
+        <div id="gatherling_main" class="box">
+            <div class="uppertitle"> Login to Gatherling </div>
+            <center>
+                <h3>Resetting your Gatherling password</h3>
+    <?php
+}
+
+function printPageFooter() {
+    ?>
+        </center>
+        </div> <!-- gatherling_main -->
+    </div> <!-- grid 10 pre 1 suff 1 -->
+<?php
+}
+
+function printForgotForm() {
+    ?>
+                    <p>Enter your email or username and we'll send you a link to get back into your account.</p>
+                    <form action="forgot.php" method="post">
+                        <input type="hidden" name="view" value="send_login_link" />
+                        <table class="form">
+                            <?php
+                                print_text_input('Email or Username', 'identifier');
+                                print_submit('Send Login Link');
+                            ?>
+                        </table>
+                    </form>
+                    <p>If you aren't able to reset your password this way please message a Gatherling Administrator
+                        on the <a href="https://discord.gg/2VJ8Fa6">Discord</a></p>
+<?php
+}
 
-?>
-<div class="grid_10 suffix_1 prefix_1">
-    <div id="gatherling_main" class="box">
-        <div class="uppertitle"> Login to Gatherling </div>
-            <center><h3>Resetting your Gatherling password</h3>
-            <!-- Chat '<code>!reset <?php echo $CONFIG['infobot_prefix'] ?></code>' to pdbot to get a replacement <br />
-            or</br> -->
-            Message a Gatherling Administrator over MTGO or Discord <br />
-    </div> <!-- gatherling_main -->
-</div> <!-- grid 10 pre 1 suff 1 -->
-
-<?php print_footer(); ?>
+function sendLoginLink($player) {
+    return mail($player->emailAddress, 'Gatherling Login Link', "Click the following link to log in to Gatherling:\n\n");
+}