Initial commit

src/Xml/Stanzas/Presence.php

@@ -0,0 +1,67 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pdahal\Xmpp\Xml\Stanzas;
+
+class Presence extends Stanza
+{
+    public const PRIORITY_UPPER_BOUND = 127;
+    public const PRIORITY_LOWER_BOUND = -128;
+
+    public function subscribe(string $to): void
+    {
+        $this->setPresence($to, 'subscribe');
+    }
+
+    public function unsubscribe(string $from): void
+    {
+        $this->setPresence($from, 'unsubscribe');
+    }
+
+    public function acceptSubscription(string $from): void
+    {
+        $this->setPresence($from, 'subscribed');
+    }
+
+    public function declineSubscription(string $from): void
+    {
+        $this->setPresence($from, 'unsubscribed');
+    }
+
+    protected function setPresence(string $to, string $type = "subscribe"): void
+    {
+        $xml = "<presence from='{$this->socket->getOptions()->bareJid()}' to='{$to}' type='{$type}'/>";
+        $this->socket->send($xml);
+    }
+
+    /**
+     * Set priority to current resource by default, or optional other resource tied to the
+     * current username
+     * @param string|null $forResource
+     */
+    public function setPriority(int $value, string $forResource = null): void
+    {
+        $from = self::quote($this->socket->getOptions()->fullJid());
+
+        if ($forResource) {
+            $from = $this->socket->getOptions()->getUsername() . "/$forResource";
+        }
+
+        $priority = "<priority>{$this->limitPriority($value)}</priority>";
+        $xml = "<presence from='{$from}'>{$priority}</presence>";
+
+        $this->socket->send($xml);
+    }
+
+    protected function limitPriority(int $value): int
+    {
+        if ($value > self::PRIORITY_UPPER_BOUND) {
+            return self::PRIORITY_UPPER_BOUND;
+        } elseif ($value < self::PRIORITY_LOWER_BOUND) {
+            return self::PRIORITY_LOWER_BOUND;
+        }
+
+        return $value;
+    }
+}