From 261ab1364aa40384b0315be60e78cd89ea7fe661 Mon Sep 17 00:00:00 2001
From: winter
Date: Sun, 23 Feb 2025 18:32:09 +0000
Subject: implement policies

---
 Digitigrade/Policy/BasicCensor.php   | 47 ++++++++++++++++++++++++++++++++++++
 Digitigrade/Policy/BlockInstance.php | 37 ++++++++++++++++++++++++++++
 2 files changed, 84 insertions(+)
 create mode 100644 Digitigrade/Policy/BasicCensor.php
 create mode 100644 Digitigrade/Policy/BlockInstance.php

(limited to 'Digitigrade/Policy')

diff --git a/Digitigrade/Policy/BasicCensor.php b/Digitigrade/Policy/BasicCensor.php
new file mode 100644
index 0000000..5866488
--- /dev/null
+++ b/Digitigrade/Policy/BasicCensor.php
@@ -0,0 +1,47 @@
+<?php
+namespace Digitigrade\Policy;
+
+use Digitigrade\Model\Actor;
+use Digitigrade\Model\Note;
+use Digitigrade\Policy;
+
+/**
+ * Simple word censorship policy that replaces all instances of some text with another string.
+ * 
+ * Suffers from the Scunthorpe problem.
+ * 
+ * Can also be (ab)used to replace some word with another word for humorous effect :3
+ */
+class BasicCensor extends Policy {
+    /** @var string[] */
+    private array $words;
+    private string $replacement;
+
+    public function __construct(array $words, string $replacement) {
+        $this->words = $words;
+        $this->replacement = $replacement;
+    }
+
+    public function checkNote(Note $note): bool {
+        foreach ($this->words as $w) {
+            if (isset($note->summary))
+                $note->summary = str_replace($w, $this->replacement, $note->summary);
+            $note->plainContent = str_replace($w, $this->replacement, $note->plainContent);
+            foreach ($note->formattedContent as $type => $content) {
+                $note->formattedContent[$type] = str_replace($w, $this->replacement, $content);
+            }
+        }
+        return true;
+    }
+
+    public function checkActor(Actor $actor): bool {
+        foreach ($this->words as $w) {
+            $actor->displayName = str_replace($w, $this->replacement, $actor->displayName);
+            if (isset($actor->pronouns))
+                $actor->pronouns = str_replace($w, $this->replacement, $actor->pronouns);
+            if (isset($actor->bio))
+                $actor->bio = str_replace($w, $this->replacement, $actor->bio);
+        }
+        return true;
+    }
+}
\ No newline at end of file
diff --git a/Digitigrade/Policy/BlockInstance.php b/Digitigrade/Policy/BlockInstance.php
new file mode 100644
index 0000000..5f902f2
--- /dev/null
+++ b/Digitigrade/Policy/BlockInstance.php
@@ -0,0 +1,37 @@
+<?php
+namespace Digitigrade\Policy;
+
+use Digitigrade\Model\Actor;
+use Digitigrade\Model\Interaction;
+use Digitigrade\Model\Note;
+use Digitigrade\Model\PushableModel;
+use Digitigrade\Policy;
+
+class BlockInstance extends Policy {
+    /** @var string[] */
+    private array $blockedHosts;
+
+    public function __construct(string ...$hosts) {
+        $this->blockedHosts = $hosts;
+    }
+
+    private function isBlocked(PushableModel $obj): bool {
+        $objHost = hostname_from_uri($obj->uri);
+        foreach ($this->blockedHosts as $host) {
+            if (str_ends_with($objHost, $host)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public function checkActor(Actor $actor): bool {
+        return !$this->isBlocked($actor);
+    }
+    public function checkInteraction(Interaction $interaction): bool {
+        return !$this->isBlocked($interaction);
+    }
+    public function checkNote(Note $note): bool {
+        return !$this->isBlocked($note);
+    }
+}
\ No newline at end of file
-- 
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