first draft of activitypub support

3 files changed, 89 insertions, 0 deletions

diff --git a/index.php b/index.php
index e82cf27..9429f19 100644
--- a/index.php
+++ b/index.php
@@ -38,6 +38,17 @@
 			case 'xmlrpc':
 				require_once(ROOT.DS.'lib'.DS.'xmlrpc.php');
 				break;
+			case '.well-known':
+				if(!empty(path(1)) && path(1) == 'webfinger') {
+					require_once(ROOT.DS.'lib'.DS.'activitypub-webfinger.php');
+				} else {
+					http_response_code(404);
+					die();
+				}
+				break;
+			case 'actor':
+				require_once(ROOT.DS.'lib'.DS.'activitypub-actor.php');
+				break;
 			default:
 				// redirect everything else to the homepage
 				if(!empty(path(0)) && path(0) != 'page') {
diff --git a/lib/activitypub-actor.php b/lib/activitypub-actor.php
new file mode 100644
index 0000000..705955b
--- /dev/null
+++ b/lib/activitypub-actor.php
@@ -0,0 +1,56 @@
+<?php
+
+	if(!file_exists(ROOT.DS.'keys'.DS.'id_rsa')) {
+		if(!is_dir(ROOT.DS.'keys')) {
+			mkdir(ROOT.DS.'keys');
+		}
+
+		// generate a key pair, if neccessary
+
+		$rsa = openssl_pkey_new([ 
+			'digest_alg' => 'sha512',
+			'private_key_bits' => 4096,
+			'private_key_type' => OPENSSL_KEYTYPE_RSA,
+		]);
+		openssl_pkey_export($rsa, $private_key);
+		$public_key = openssl_pkey_get_details($rsa)['key'];
+
+		file_put_contents(ROOT.DS.'keys'.DS.'id_rsa', $private_key);
+		file_put_contents(ROOT.DS.'keys'.DS.'id_rsa.pub', $public_key);
+	} else {
+		$public_key = file_get_contents(ROOT.DS.'keys'.DS.'id_rsa.pub');
+	}
+
+	
+
+	/*
+
+	$data = [
+		'subject' => 'acct:'.$actor.'@'.$domain,
+		'links' => [
+			'rel' => 'self',
+			'type' => 'application/activity+json',
+			'href' => $config['url'].'/actor'
+		]
+	];
+	*/
+
+	header('Content-Type: application/ld+json');
+	// echo(json_encode($data, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES));
+?>{
+	"@context": [
+		"https://www.w3.org/ns/activitystreams",
+		"https://w3id.org/security/v1"
+	],
+
+	"id": "<?= $config['url'] ?>/actor",
+	"type": "Person",
+	"preferredUsername": "<?= ltrim($config['microblog_account'], '@') ?>",
+	"inbox": "<?= $config['url'] ?>/inbox",
+
+	"publicKey": {
+		"id": "<?= $config['url'] ?>/actor#main-key",
+		"owner": "<?= $config['url'] ?>/actor",
+		"publicKeyPem": "<?= preg_replace('/\n/', '\n', $public_key) ?>"
+	}
+}
diff --git a/lib/activitypub-webfinger.php b/lib/activitypub-webfinger.php
new file mode 100644
index 0000000..2ad44fb
--- /dev/null
+++ b/lib/activitypub-webfinger.php
@@ -0,0 +1,22 @@
+<?php
+
+	// todo: handle empty usernames
+
+	$actor = ltrim($config['microblog_account'], '@');
+	$url = parse_url($config['url']);
+	$domain = $url['host'];
+	if(!empty($url['path'])) $domain .= rtrim($url['path'], '/');
+
+	$data = [
+		'subject' => 'acct:'.$actor.'@'.$domain,
+		'links' => [
+			[
+				'rel' => 'self',
+				'type' => 'application/activity+json',
+				'href' => $config['url'].'/actor'
+			]
+		]
+	];
+
+	header('Content-Type: application/ld+json');
+	echo(json_encode($data, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES));