First steps for a public relay for posts.

mod/_well_known.php

@@ -7,8 +7,40 @@ function _well_known_init(&$a){
 			case "host-meta":
 				hostxrd_init($a);
 				break;
+			case "x-social-relay":
+				wk_social_relay($a);
+				break;
 		}
 	}
 	http_status_exit(404);
 	killme();
 }
+
+function wk_social_relay(&$a) {
+
+	define('SR_SCOPE_ALL', 'all');
+	define('SR_SCOPE_TAGS', 'tags');
+
+	$subscribe = (bool)true;
+	$scope = SR_SCOPE_ALL;
+	//$scope = SR_SCOPE_TAGS;
+
+	$tags = array();
+
+	if ($scope == SR_SCOPE_TAGS) {
+		$terms = q("SELECT DISTINCT(`term`) FROM `search`");
+
+		foreach($terms AS $term) {
+			$tag = trim($term["term"], "#");
+			$tags[] = $tag;
+		}
+	}
+
+	$relay = array("subscribe" => $subscribe,
+			"scope" => $scope,
+			"tags" => array_unique($tags));
+
+	header('Content-type: application/json; charset=utf-8');
+	echo json_encode($relay, true);
+	exit;
+}