Add item read page (#7)

- Open items links in an external window
- Include "Keep as New" button

src/public/item.php

@@ -0,0 +1,79 @@
+<?php
+
+/**
+ * Item View Page
+ *
+ * Retrieves and displays an item from a feed belonging to the current user
+ */
+
+include '../start.php';
+
+Security::verifyUser();
+
+$db = Data::getConnection();
+
+if ($_SERVER['REQUEST_METHOD'] == 'POST') {
+    // "Keep as New" button sends a POST request to reset the is_read flag before going back to the list of unread items
+    $isValidQuery = $db->prepare(<<<'SQL'
+        SELECT COUNT(*)
+          FROM item INNER JOIN feed ON feed.id = item.feed_id
+         WHERE item.id = :id AND feed.user_id = :user
+        SQL);
+    $isValidQuery->bindValue(':id',   $_POST['id']);
+    $isValidQuery->bindValue(':user', $_REQUEST[Key::USER_ID]);
+    $isValidResult = $isValidQuery->execute();
+    if ($isValidResult && $isValidResult->fetchArray(SQLITE3_NUM)[0] == 1) {
+        $keepUnread = $db->prepare('UPDATE item SET is_read = 0 WHERE id = :id');
+        $keepUnread->bindValue(':id', $_POST['id']);
+        $keepUnread->execute();
+    }
+    $db->close();
+    frc_redirect('/');
+}
+
+$query = $db->prepare(<<<'SQL'
+    SELECT item.title AS item_title, item.item_link, item.published_on, item.updated_on, item.content, item.is_encoded,
+           feed.title AS feed_title
+      FROM item INNER JOIN feed ON feed.id = item.feed_id
+     WHERE item.id      = :id
+       AND feed.user_id = :user
+    SQL);
+$query->bindValue(':id',   $_GET['id']);
+$query->bindValue(':user', $_REQUEST[Key::USER_ID]);
+$result = $query->execute();
+$item = $result ? $result->fetchArray(SQLITE3_ASSOC) : false;
+
+if ($item) {
+    $markRead = $db->prepare('UPDATE item SET is_read = 1 WHERE id = :id');
+    $markRead->bindValue(':id', $_GET['id']);
+    $markRead->execute();
+}
+
+$published = date_time($item['published_on']);
+$updated   = isset($item['updated_on']) ? date_time($item['updated_on']) : null;
+$isEncoded = (bool) $item['is_encoded'];
+
+page_head(htmlentities("{$item['item_title']} | {$item['feed_title']}")); ?>
+<h1 class=item_heading>
+    <a href="<?=$item['item_link']?>" target=_blank rel=noopener><?=$item['item_title']?></a><br>
+</h1>
+<div class=item_published>
+    From <strong><?=htmlentities($item['feed_title'])?></strong><br>
+    Published <?=date_time($item['published_on'])?><?=$updated && $updated != $published ? " (Updated $updated)" : ''?>
+</div>
+<article>
+    <div class=item_content><?php
+        if ($isEncoded) {
+            echo str_replace('<a ', '<a target=_blank rel=noopener ', $item['content']);
+        } else {
+            echo htmlentities($item['content']);
+        } ?>
+    </div>
+    <form class=action_buttons action=/item method=POST>
+        <input type=hidden name=id value=<?=$_GET['id']?>>
+        <a href="/">Done</a>
+        <button type=submit>Keep as New</button>
+    </form>
+</article><?php
+page_foot();
+$db->close();