support zot location independent urls

1 files changed, 91 insertions, 0 deletions

diff --git a/Zotlabs/Lib/ZotURL.php b/Zotlabs/Lib/ZotURL.php
new file mode 100644
index 000000000..d1c705fcb
--- /dev/null
+++ b/Zotlabs/Lib/ZotURL.php
@@ -0,0 +1,91 @@
+<?php
+
+namespace Zotlabs\Lib;
+
+use Zotlabs\Zot6\HTTPSig;
+
+
+class ZotURL {
+
+	static public function fetch($url,$channel) {
+
+		$ret = [ 'success' => false ];
+
+		if(strpos($url,'x-zot:') !== 0) {
+			return $ret;
+		}
+
+
+		if(! $url) {
+			return $ret;
+		}
+
+		$portable_url = substr($url,6);
+		$u = explode('/',$portable_url);		
+		$portable_id = $u[0];
+
+		$hosts = self::lookup($portable_id);
+
+		if(! $hosts) {
+			return $ret;
+		}
+
+		foreach($hosts as $h) {
+			$newurl = $h . '/id/' . $portable_url;
+
+			$m = parse_url($newurl);
+
+			$data = json_encode([ 'zot_token' => random_string() ]);
+
+			if($channel && $m) {
+
+				$headers = [ 
+					'Accept'           => 'application/x-zot+json', 
+					'Content-Type'     => 'application/x-zot+json',
+					'X-Zot-Token'      => random_string(),
+					'Digest'           => HTTPSig::generate_digest_header($data),
+					'Host'             => $m['host'],
+					'(request-target)' => 'post ' . get_request_string($newurl)
+				];
+				$h = HTTPSig::create_sig($headers,$channel['channel_prvkey'],channel_url($channel),false);
+			}
+			else {
+				$h = [ 'Accept: application/x-zot+json' ]; 
+			}
+				
+			$result = [];
+
+			$redirects = 0;
+			$x = z_post_url($newurl,$data,$redirects, [ 'headers' => $h  ] );
+			if($x['success']) {
+				return $x;
+			}
+		}
+
+		return $ret;
+
+	}
+
+	static public function is_zoturl($s) {
+
+		if(strpos($url,'x-zot:') === 0) {
+			return true;
+		}
+		return false;
+	}
+
+
+	static public function lookup($portable_id) {
+
+		$r = q("select * from hubloc left join site on hubloc_url = site_url where hubloc_hash = '%s' and site_dead = 0 order by hubloc_primary desc",
+			dbesc($portable_id)
+		);
+
+		if(! $r) {
+			// extend to network lookup
+			return false;
+		}
+		return ids_to_array($r,'hubloc_url');
+	}
+
+}
\ No newline at end of file