From 72b07245f44c73ed41bfcca2465a9ee34426a922 Mon Sep 17 00:00:00 2001
From: winter
Date: Thu, 19 Dec 2024 20:59:18 +0000
Subject: implement follow relationships (untested)

does NOT implement the actual behaviour behind follows (receiving posts and such)
---
 misc/send_request_authenticated.php | 66 +++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 misc/send_request_authenticated.php

(limited to 'misc/send_request_authenticated.php')

diff --git a/misc/send_request_authenticated.php b/misc/send_request_authenticated.php
new file mode 100644
index 0000000..9019da8
--- /dev/null
+++ b/misc/send_request_authenticated.php
@@ -0,0 +1,66 @@
+<?php
+
+use Digitigrade\GlobalConfig;
+use Digitigrade\Model\Actor;
+use Digitigrade\Model\Instance;
+
+/**
+ * Makes an HTTPS request to a remote instance, using the corresponding outbound auth token (if any)
+ * @param string $uri
+ * @param bool $dontLookUpInstance if true, will skip looking up the Instance, and consequently the auth token
+ * @param string $method HTTP verb
+ * @param ?Actor $actingAs if specified, the local actor to send the request on behalf of
+ * @return stdClass object with fields `body` and `headers`
+ */
+function send_request_authenticated(
+    string $uri,
+    bool $dontLookUpInstance = false,
+    string $method = 'GET',
+    ?Actor $actingAs = null
+) {
+    if (!str_starts_with($uri, 'https://')) {
+        throw new RuntimeException('refusing to fetch a non-https uri');
+    }
+
+    $remoteHost = hostname_from_uri($uri);
+    if ($remoteHost == GlobalConfig::getInstance()->getCanonicalHost()) {
+        throw new RuntimeException('refusing to fetch content from myself');
+    }
+
+    $instance = null;
+    if (!$dontLookUpInstance) {
+        $instance = Instance::findByHostname($remoteHost);
+    }
+
+    if (!isset($instance->auth->outboundToken) || $instance->auth->outboundToken == null) {
+        // hopefully we can make the request anyway?
+        $context = stream_context_create(['http' => ['method' => $method]]);
+        $resp = file_get_contents($uri);
+        // $http_response_header just poofs into existence .
+        // i don't like this api. i should probably use curl instead. hmm
+        // TODO: use curl instead of file_get_contents
+        if (str_contains($http_response_header[0], '401') || str_contains($http_response_header[0], '403')) {
+            // we can't authenticate right now because it's asynchronous
+            // so i'm choosing to begin the auth process now and return false in the hopes that
+            // this request will be retried later
+            $instance?->beginOutboundAuth();
+        }
+        $result = new stdClass();
+        $result->body = $resp;
+        $result->headers = $http_response_header;
+        return $result;
+    }
+
+    $header = 'Authorization: Bearer ' . $instance->auth->outboundToken;
+    if ($actingAs != null) {
+        $header .= "\nX-PawPub-Actor: $actingAs->uri";
+    }
+    $context = stream_context_create(['http' => [
+        'method' => $method,
+        'header' => $header
+    ]]);
+    $result = new stdClass();
+    $result->body = file_get_contents($uri, context: $context);
+    $result->headers = $http_response_header;
+    return $result;
+}
\ No newline at end of file
-- 
cgit v1.3