Update README.md

README.md

@@ -1,7 +1,8 @@
 # gnuboard5-activitypub
-ActivityPub implementation for GNUBOARD 5
+GNUBOARD5-ActivityPub: ActivityPub (Fediverse) implementation for GNUBOARD5
 
-https://sir.kr/g5_plugin/10381
+* https://sir.kr/g5_plugin/10381
+* https://codeberg.org/fediverse/delightful-activitypub-development
 
 ## 사용 전 설정
   * `apstreams` 게시판 추가
@@ -15,12 +16,12 @@ https://sir.kr/g5_plugin/10381
 - [x] Followers
 - [x] Following
 - [x] Liked
-- [ ] Shares (개선 진행 중)
+- [ ] ~~Shares~~ (Altered to inbound/outbound)
-- [x] Geolocation (IP2Location, Naver Cloud)
+- [x] Geolocation
 - [x] File attachment
-- [ ] File attachment - Automatically download a file to the local server
+- [ ] File attachment - Automatically download a remote file to the local server
-- [x] Digest/Signature
+- [x] Digest/Signature - Outbound
-- [ ] Digest/Signature - Verification
+- [ ] ~~Digest/Signature - Inbound~~ (No required)
 - [x] w3id.org (e.g. the `publicKey` field of an actor)
 - [ ] OAuth 2.0
 - [ ] Message Queue Compatible (e.g. Redis, RebbitMQ, Kafka)
@@ -29,9 +30,10 @@ https://sir.kr/g5_plugin/10381
 - [x] 아바타 (gravatar.com)
 - [x] 날씨 (openweathermap.org)
 - [x] 환율 (koreaexim.go.kr)
+- [x] 국내 Geolocation (Naver Cloud)
+- [x] 국외 Geolocation (IP2Location)
 
-
+## 전문(메시지) 예시
-## 전문 예시
 
 ```json
 {
@@ -121,6 +123,9 @@ https://sir.kr/g5_plugin/10381
 * https://github.com/autogestion/pubgate-telegram
 * https://docs.joinmastodon.org/spec/security/
 * https://chat.openai.com/share/4fda7974-cc0b-439a-b0f2-dc828f8acfef
+* https://codeberg.org/mro/activitypub/src/commit/4b1319d5363f4a836f23c784ef780b81bc674013/like.sh#L101
+* https://socialhub.activitypub.rocks/t/problems-posting-to-mastodon-inbox/801/10
 
 ## 문의
 * abuse@catswords.net
+* ActivityPub [@gnh1201@catswords.social](https://catswords.social/@gnh1201)

extend/activitypub.extend.php

@@ -1,11 +1,12 @@
 <?php
 if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
 
-// ActivityPub implementation for GNUBOARD 5
+// Description: ActivityPub implementation for GNUBOARD 5
-// Go Namhyeon <abuse@catswords.net>
+// Author: Go Namhyeon (Catswords Research) <abuse@catswords.net>
-// MIT License
+// ActivityPub: @gnh1201@catswords.social
-// 2023-08-06 (version 0.1.16)
+// License: MIT
-
+// Date: 2023-08-08
+// Version: 0.1.18
 // References:
 //   * https://www.w3.org/TR/activitypub/
 //   * https://www.w3.org/TR/activitystreams-core/
@@ -17,9 +18,12 @@ if (!defined('_GNUBOARD_')) exit; // 개별 페이지 접근 불가
 //   * https://github.com/broidHQ/integrations/tree/master/broid-schemas#readme
 //   * https://github.com/autogestion/pubgate-telegram
 //   * https://blog.joinmastodon.org/2018/06/how-to-implement-a-basic-activitypub-server/
+//   * https://chat.openai.com/share/4fda7974-cc0b-439a-b0f2-dc828f8acfef
+//   * https://codeberg.org/mro/activitypub/src/commit/4b1319d5363f4a836f23c784ef780b81bc674013/like.sh#L101
+//   * https://socialhub.activitypub.rocks/t/problems-posting-to-mastodon-inbox/801/10
 
 define("ACTIVITYPUB_INSTANCE_ID", md5_file(G5_DATA_PATH . "/dbconfig.php"));
-define("ACTIVITYPUB_INSTANCE_VERSION", "0.1.14-dev");
+define("ACTIVITYPUB_INSTANCE_VERSION", "0.1.18");
 define("ACTIVITYPUB_DEFAULT_SCHEME", "https");    // 외부 통신용 스킴 (SSL 사용이 기본)
 define("ACTIVITYPUB_INSECURE_SCHEME", "http");    // 그누보드5 ActivityPub 통신용 스킴 (SSL 사용을 하지 않을 수도 있음을 고려)
 define("ACTIVITYPUB_HOST", (empty(G5_DOMAIN) ? $_SERVER['HTTP_HOST'] : G5_DOMAIN));
@@ -348,7 +352,7 @@ function activitypub_build_http_headers($headers) {
 
 function activitypub_build_datetime($s='now') {
     // e.g. 18 Dec 2019 10:08:46 GMT
-    $format = "d M Y H:i:s e";
+    $format = "D, d M Y H:i:s e";
     $dt = ($s == "now" ? new DateTime('now', new DateTimeZone("GMT")) : DateTime::createFromFormat($format, $s));
     return $dt->format($format);
 }
@@ -360,7 +364,7 @@ function activitypub_build_digest($body) {
     return $digest;
 }
 
-function activitypub_build_signature($url, $date, $digest, $mb, $method="POST") {
+function activitypub_build_signature($url, $date, $digest, $mb, $method="post") {
     // get a certificate
     list($private_key, $public_key) = activitypub_get_stored_keypair($mb);
     
@@ -372,13 +376,24 @@ function activitypub_build_signature($url, $date, $digest, $mb, $method="POST")
     $keyId = $activitypub_user_id . "#main-key";
 
     // build a target data to get signature
+    /*
     $signature = $method . ' ' . $path . "\n" .
         'HOST: ' . $host . "\n" .
         'Date: ' . $date . "\n" .
         'Digest: ' . $digest;
+    */
+    // Ref: https://codeberg.org/mro/activitypub/src/commit/4b1319d5363f4a836f23c784ef780b81bc674013/like.sh#L101
+    $signature = sprintf(
+        "%s: %s\n%s: %s\n%s: %s\n%s: %s",
+        "(request-target)",
+        "{$method} {$path}",
+        "host", $host,
+        "date", $date,
+        "digest", $digest
+    );
 
     // create a signature
-    openssl_sign($signature, $signature, $privateKey, OPENSSL_ALGO_SHA256);
+    openssl_sign($signature, $signature, $private_key, OPENSSL_ALGO_SHA256);
     $signature = base64_encode($signature);
 
     // create a signature header
@@ -389,7 +404,7 @@ function activitypub_http_get($url, $access_token = '') {
     // build the header
     $headers = array(
         "Date" => activitypub_build_datetime('now'),
-        "Accept" => "application/ld+json; profile=\"" . NAMESPACE_ACTIVITYSTREAMS . "\""
+        "Accept" => "application/activity+json; profile=\"" . NAMESPACE_ACTIVITYSTREAMS . "\""
     );
 
     // set access token
@@ -430,20 +445,20 @@ function activitypub_get_attachments($bo_table, $wr_id) {
     return $attachments;
 }
 
-function activitypub_http_post($url, $raw_data, $mb, $access_token = '') {
+function activitypub_http_post($url, $rawdata, $mb, $access_token = '') {
     // get digest
     $date = activitypub_build_datetime('now');
-    $digest = activitypub_build_digest($raw_data);
+    $digest = activitypub_build_digest($rawdata);
 
     // build the headers
     $headers = array(
         "Date" => $date,
         "Digest" => $digest,
-        "Content-Type" => "application/ld+json; profile=\"" . NAMESPACE_ACTIVITYSTREAMS . "\"",
+        "Content-Type" => "application/activity+json; profile=\"" . NAMESPACE_ACTIVITYSTREAMS . "\"",
     );
 
     // build the signature
-    $signature = activitypub_build_signature($url, $date, $digest, $mb, "POST");
+    $signature = activitypub_build_signature($url, $date, $digest, $mb);
     $headers["Signature"] = $signature;
 
     // set access token
@@ -459,12 +474,18 @@ function activitypub_http_post($url, $raw_data, $mb, $access_token = '') {
         CURLOPT_SSL_VERIFYPEER => false,
         CURLOPT_CONNECTTIMEOUT => 10,
         CURLOPT_RETURNTRANSFER => true,
-        CURLOPT_POSTFIELDS => $raw_data,
+        CURLOPT_POSTFIELDS => $rawdata,
         CURLOPT_POST => true
     ));
     $response = curl_exec($ch);
+    $errno = curl_errno($ch);
     curl_close($ch);
 
+    // 전송 오류가 있었을 시 쪽지로 알림
+    if ($errno) {
+        activitypub_add_memo(ACTIVITYPUB_G5_USERNAME, $mb['mb_id'], "[경고] 메시지 전송 중 오류가 발생함. 오류 번호: " . $errno);
+    }
+
     return activitypub_json_decode($response, true);
 }
 
@@ -560,6 +581,9 @@ function koreaexim_get_exchange_data() {
 }
 
 function activitypub_publish_content($content, $object_id, $mb, $_added_object = array(), $_added_to = array()) {
+    // 액티비티 관리용 계정의 글 전송 차단
+    if ($mb['mb_id'] == ACTIVITYPUB_G5_USERNAME) return;
+
     // 위치정보를 사용하는 경우 모듈 로드
     $location_ctx = array();
     if (ACTIVITYPUB_ENABLED_GEOLOCATION) {
@@ -647,7 +671,10 @@ function activitypub_publish_content($content, $object_id, $mb, $_added_object =
     $terms = activitypub_parse_content($content);
 
     // 수신자/내용 생성
-    $to = array_merge(array(NAMESPACE_ACTIVITYSTREAMS_PUBLIC), $_added_to);
+    $to = array_merge(activitypub_cast_to_array(NAMESPACE_ACTIVITYSTREAMS_PUBLIC), $_added_to);
+    $cc = array();  // 참조자
+    $tag = array();  // 태그
+    $endpoints = array();
     $content = "";
     foreach($terms as $term_ctx) {
         switch ($term_ctx['type']) {
@@ -677,14 +704,24 @@ function activitypub_publish_content($content, $object_id, $mb, $_added_object =
                         $counter--;   // 시도 횟수 차감
                     }
 
-                    // WebFinger 정보 수신을 못한 경우 아무 작업도 하지 않음
+                    // WebFinger 정보 수신을 못한 경우, 쪽지로 알리고 아무 작업도 하지 않음
-                    if ($counter < 0) break;
+                    if (empty($webfigner_ctx['subject'])) {
+                        activitypub_add_memo(ACTIVITYPUB_G5_USERNAME, $mb['mb_id'], "[발송실패] 수신자를 찾을 수 없음: @" . $account);
+                        break;
+                    }
 
                     // 받은 요청으로 처리
                     $webfigner_links = $webfigner_ctx['links'];
                     foreach($webfigner_links as $link) {
                         if ($link['rel'] == "self" && $link['type'] == "application/activity+json") {
-                            array_push($to, $link['href']);  // 수신자에 반영
+                            // 태그 목록에 추가
+                            array_push($tag, array(
+                                "type" => "Mention",
+                                "href" => $link['href'],
+                                "name" => '@' . $account
+                            ));
+                            array_push($cc, $link['href']);  // 참조자 목록에 추가
+                            array_push($endpoints, $link['href']);  // 글을 전송할 엔드포인트(URL)에 반영
                         }
                     }
                 }
@@ -698,48 +735,57 @@ function activitypub_publish_content($content, $object_id, $mb, $_added_object =
 
     // 위치정보가 활성화되어 있으면
     if (ACTIVITYPUB_ENABLED_GEOLOCATION) {
-        $object = array_merge($_added_object, array(
+        $_added_object = array_merge($_added_object, array(
             "location" => $location_ctx
         ));
     }
 
+    // 태그 추가
+    $_added_object = array_merge($_added_object, array(
+        "tag" => $tag
+    ));
+
     // 전문 생성
     $object = activitypub_build_note($content, $object_id, $mb, $_added_object);
 
     // 외부로 보낼 전문 생성
     $data = array(
-        "@context" => NAMESPACE_ACTIVITYSTREAMS,
+        "@context" => activitypub_cast_to_array(NAMESPACE_ACTIVITYSTREAMS),
         "type" => "Create",
         "id" => G5_BBS_URL . "/board.php?bo_table=" . ACTIVITYPUB_G5_BOARDNAME . "#Draft",
         "to" => $to,
+        "cc" => $cc,
         "actor" => $object['attributedTo'],
         "object" => $object
     );
 
     // 초안(Draft) 작성
-    $activity_wr_id = activitypub_update_activity("outbox", $data, $mb, "draft");
+    $activity_id = activitypub_update_activity("outbox", $data, $mb, "draft");
-    $data['id'] = G5_BBS_URL . "/board.php?bo_table=" . ACTIVITYPUB_G5_BOARDNAME . "&wr_id=" . $activity_wr_id;
+    $data['object']['id'] = G5_BBS_URL . "/board.php?bo_table=" . ACTIVITYPUB_G5_BOARDNAME . "&wr_id=" . $activity_id;
+    $data['id'] = activitypub_get_url("activity", array("id" => $activity_id));
+
+    // 현재 시간 반영
+    $now_utc_tz = str_replace('+00:00', 'Z', gmdate('c'));
+    $data['published'] = $now_utc_tz;
+    $data['updated'] = $now_utc_tz;
 
     // 보낼 전문을 인코딩
     $rawdata = activitypub_json_encode($data);
 
-    // 수신자 작업
+    // 수신자 엔드포인트(URL) 작업
-    foreach($to as $_to) {
+    foreach($endpoints as $endpoint) {
-        // 공개 네임스페이스인 경우 건너뛰기
-        if ($_to == NAMESPACE_ACTIVITYSTREAMS_PUBLIC) continue;
-
         // 수신자 정보 조회
-        $remote_user_ctx = activitypub_http_get($_to);
+        $remote_account_ctx = activitypub_http_get($endpoint);
 
         // inbox 주소 찾기
-        $remote_inbox_url = $remote_user_ctx['inbox'];
+        $remote_inbox_url = $remote_account_ctx['inbox'];
         if (empty($remote_inbox_url)) {
-            $remote_inbox_url = $remote_user_ctx['endpoints']['sharedInbox'];
+            $remote_inbox_url = $remote_account_ctx['endpoints']['sharedInbox'];
         }
 
         // inbox 주소가 없으면 건너뛰기
         if (empty($remote_inbox_url)) {
-            activitypub_add_memo(ACTIVITYPUB_G5_USERNAME, $mb['mb_id'], "Could not find the inbox of " . $_to);
+            activitypub_add_memo(ACTIVITYPUB_G5_USERNAME, $mb['mb_id'], "이 사용자 또는 서버는 메시지를 수신할 수 없는 상태임: " . $_to);
             continue;
         }
 
@@ -754,7 +800,7 @@ function activitypub_publish_content($content, $object_id, $mb, $_added_object =
         }
 
         // inbox로 데이터 전송
-        $response = activitypub_http_post($remote_inbox_url, $rawdata, $mb, $access_token);
+        activitypub_http_post($remote_inbox_url, $rawdata, $mb, $access_token);
     }
 
     // 발행됨(Published)으로 상태 업데이트
@@ -769,12 +815,13 @@ function activitypub_parse_content($content) {
     $pos = -1;
     $get_next_position = function ($pos) use ($content) {
         try {
-            return min(array_filter(array(
+            $positions = array_filter(array(
                 strpos($content, '@', $pos + 1),
                 strpos($content, '#', $pos + 1),
                 strpos($content, 'http://', $pos + 1),
                 strpos($content, 'https://', $pos + 1)
-            ), "is_numeric"));
+            ), "is_numeric");
+            return (count($positions) > 0 ? min($positions) : false);
         } catch (ValueError $e) {
             return false;
         }
@@ -904,8 +951,8 @@ function activitypub_update_activity($inbox = "inbox", $data, $mb = array("mb_id
     if ($status == "published") {
         // 저장 전 데이터 처리
         $now_utc_tz = str_replace('+00:00', 'Z', gmdate('c'));
-        $data['published'] = $now_utc_tz;
+        $data['published'] = empty($data['published']) ? $now_utc_tz : $data['published'];
-        $data['updated'] = $now_utc_tz;
+        $data['updated'] = empty($data['updated']) ? $now_utc_tz : $data['updated'];
 
         // 요청 전문은 파일로 저장
         $raw_context = activitypub_json_encode($data);
@@ -947,43 +994,30 @@ function activitypub_update_activity($inbox = "inbox", $data, $mb = array("mb_id
     return $wr_id;
 }
 
-function activitypub_get_objects($mb, $inbox = "inbox") {
+function activitypub_get_activity_by_id($activity_id) {
     global $g5;
 
-    $items = array();
+    // 액티비티 전문
+    $activity_ctx = array();
 
-    // 정보 불러오기
+    // 해당 액티비티 찾고 없으면 빈 정보 반환
-    $sql = "";
+    $write_table = $g5['write_prefix'] . ACTIVITYPUB_G5_BOARDNAME;
-    if(!$mb['mb_id']) {
+    $wr = get_write($write_table, $activity_id);
-        $sql = "select wr_id from " . ACTIVITYPUB_G5_TABLENAME . "
+    if (empty($wr['wr_id'])) return $activity_ctx;
-            where ca_name = '$inbox'
+
-                and DATE(wr_datetime) BETWEEN CURDATE() - INTERVAL " . ACTIVITYPUB_G5_OUTDATED_DAYS . " DAY AND CURDATE()
+    // 액티비티 조회
-        ";
+    $sql = "select * from {$g5['board_file_table']}
-    } else {
+        where bo_table = '" . ACTIVITYPUB_G5_BOARDNAME . "' and wr_id = '{$wr['wr_id']}' and bf_content = 'application/activity+json'";
-        $sql = "select wr_id from " . ACTIVITYPUB_G5_TABLENAME . "
-            where ca_name = '$inbox'
-                and FIND_IN_SET('$mb_id', wr_7) > 0
-                and DATE(wr_datetime) BETWEEN CURDATE() - INTERVAL " . ACTIVITYPUB_G5_OUTDATED_DAYS . " DAY AND CURDATE()
-        ";
-    }
     $result = sql_query($sql);
-
-    // 정보 조회 후 처리
     while ($row = sql_fetch_array($result)) {
-        $sql2 = "select * from {$g5['board_file_table']}
+        $filename = $row['bf_file'];
-            where bo_table = '" . ACTIVITYPUB_G5_BOARDNAME . "' and wr_id = '{$row['wr_id']}' and bf_content = 'application/activity+json'";
-        $result2 = sql_query($sql2);
-        while ($row2 = sql_fetch_array($result2)) {
-            $filename = $row2['bf_file'];
         $filepath = G5_DATA_PATH . "/file/" . ACTIVITYPUB_G5_BOARDNAME . "/" . $filename;
         if (file_exists($filepath)) {
-                array_push($items, activitypub_json_decode(file_get_contents($filepath))['object']);
+            $activity_ctx = activitypub_json_decode(@file_get_contents($filepath))['object'];
-            }
         }
     }
 
-    // 전문 만들기
+    return $activity_ctx;
-    return activitypub_build_collection($items);
 }
 
 // Object type: Note
@@ -1133,6 +1167,17 @@ class _GNUBOARD_ActivityPub {
         return activitypub_json_encode($context);
     }
     
+    public static function activity() {
+        // HTTP 요청 유형에 따라 작업
+        switch ($_SERVER['REQUEST_METHOD']) {
+            case "POST":
+                return activitypub_json_encode(array("message" => "Disallowed method"));
+
+            case "GET":
+                return activitypub_get_activity_by_id($_GET['id']);
+        }
+    }
+
     public static function inbox() {
         // HTTP 요청 유형에 따라 작업
         switch ($_SERVER['REQUEST_METHOD']) {
@@ -1376,8 +1421,7 @@ class _GNUBOARD_ActivityPub {
                 return activitypub_json_encode(array("message" => "Success"));
 
             case "GET":
-                $mb = get_member($_GET['mb_id']);
+                return activitypub_json_encode(array("message" => "Disallowed method"));
-                return activitypub_json_encode(activitypub_get_objects($mb, "inbox"));
 
             default:
                 return activitypub_json_encode(array("message" => "Not supported method"));
@@ -1419,56 +1463,6 @@ class _GNUBOARD_ActivityPub {
 
         $items = array();  // 항목을 담을 배열
 
-        /* // TODO: Remove (Security Reason)
-        // 게시판인 경우
-        if (array_key_exists("bo_table", $_GET)) {
-            $bo = get_board_db($_GET['bo_table'], true);
-
-            if (!empty($bo['bo_table'])) {
-                switch($bo['bo_table']) {
-                    case ACTIVITYPUB_G5_BOARDNAME:
-                        return self::inbox();   // 액티비티를 저장하는 테이블인 경우 inbox와 동일하게 취급
-
-                    default:
-                        
-
-                        // 조회할 페이지 수 불러오기
-                        $page = intval($_GET['page']);
-                        if ($page < 1) {
-                            $page = 1;
-                        }
-
-                        // 페이지 당 표시할 게시물 수 불러오기
-                        $page_rows = 0;
-                        if (!empty($bo['bo_mobile_page_rows'])) {
-                            $page_rows = intval($bo['bo_mobile_page_rows']);
-                        } else if (!empty($bo['bo_page_rows'])) {
-                            $page_rows = intval($bo['bo_page_rows']);
-                        }
-
-                        // 페이지 당 표시할 게시물 수가 1보다 작으면 기본값(15)로 설정
-                        if ($pages_rows < 1) {
-                            $page_rows = 15;
-                        }
-
-                        // SQL 작성
-                        $write_table = $g5['write_prefix'] . $bo['bo_table'];
-                        $offset = ($page - 1) * $page_rows;
-                        $sql = "select wr_id, mb_id, wr_content, wr_datetime from {$write_table} where FIND_IN_SET('secret', wr_option) = 0 order by wr_datetime desc limit {$offset}, {$page_rows} ";
-
-                        // SQL 실행
-                        $result = sql_query($sql);
-                        while ($row = sql_fetch_array($result)) {
-                            $object_id = G5_BBS_URL . "/board.php?bo_table={$bo['bo_table']}&wr_id={$row['wr_id']}";
-                            $mb = get_member($row['mb_id']);
-                            $content = $row['wr_content'];
-                            array_push($items, activitypub_build_note($content, $object_id, $mb));
-                        }
-                }
-            }
-        }
-        */
-
         // 최근 활동에서 추출
         $sql = "select * from " . $g5['board_new_table']; 
         $result = sql_query($sql);
@@ -1493,15 +1487,15 @@ class _GNUBOARD_ActivityPub {
 
         switch ($grant_type) {
             case "authorization_code":
-                return activitypub_json_encode(array("message" => "Sorry. This grant type does not supported yet"));
+                return activitypub_json_encode(array("message" => "Not implemented"));
                 break;
 
             case "password":
-                return activitypub_json_encode(array("message" => "Sorry. This grant type does not supported yet"));
+                return activitypub_json_encode(array("message" => "Not implemented"));
                 break;
 
             case "client_credentials":
-                return activitypub_json_encode(array("message" => "Sorry. This grant type does not supported yet"));
+                return activitypub_json_encode(array("message" => "Not implemented"));
                 break;
         }
     }
@@ -1518,13 +1512,13 @@ function _activitypub_memo_form_update_after($member_list, $str_nick_list, $redi
     // 'apstreams' 계정이 있는지 확인
     if (!in_array(ACTIVITYPUB_G5_USERNAME, $member_list['id'])) return;
 
-    // 현재 로그인되어 있으면, 로그인된 계정의 정보를 따름
+    // 글을 생성한 회원 정보
     $mb = (isset($member['mb_id']) ? $member : get_member(ACTIVITYPUB_G5_USERNAME));
 
     // 글 전송하기
     if (!empty($mb['mb_id'])) {
         // 글 전송하기
-        $data = activitypub_publish_content(
+        activitypub_publish_content(
             $me_memo,
             activitypub_get_url("user", array("mb_id" => $mb['mb_id'])),
             $mb
@@ -1535,12 +1529,12 @@ function _activitypub_memo_form_update_after($member_list, $str_nick_list, $redi
 function _activitypub_write_update_after($board, $wr_id, $w, $qstr, $redirect_url) {
     global $g5, $member;
 
-    // 본문 가져오기
+    // 본문 가져오기 (본문이 없는 경우 중단)
     $sql = "select wr_id, wr_content from {$g5['write_prefix']}{$board['bo_table']} where wr_id = '{$wr_id}'";
     $row = sql_fetch($sql);
     if (empty($row['wr_id'])) return;
 
-    // 현재 로그인되어 있으면, 로그인된 계정의 정보를 따름
+    // 글을 생성한 회원 정보
     $mb = (isset($member['mb_id']) ? $member : get_member(ACTIVITYPUB_G5_USERNAME));
 
     // 추가할 오브젝트 속성
@@ -1554,7 +1548,7 @@ function _activitypub_write_update_after($board, $wr_id, $w, $qstr, $redirect_ur
 
     // 글 전송하기
     if (!empty($mb['mb_id'])) {
-        $data = activitypub_publish_content(
+        activitypub_publish_content(
             $row['wr_content'],
             G5_BBS_URL . "/board.php?bo_table={$board['bo_table']}&wr_id={$row['wr_id']}",
             $mb,
@@ -1566,12 +1560,12 @@ function _activitypub_write_update_after($board, $wr_id, $w, $qstr, $redirect_ur
 function _activitypub_comment_update_after($board, $wr_id, $w, $qstr, $redirect_url, $comment_id, $reply_array) {
     global $g5, $member;
 
-    // 본문(댓글) 가져오기
+    // 본문(댓글) 가져오기 (본문이 없는 경우 중단)
     $sql = "select wr_id, wr_content from {$g5['write_prefix']}{$board['bo_table']} where wr_id = '{$wr_id}'";
     $row = sql_fetch($sql);
     if (empty($row['wr_id'])) return;
 
-    // 현재 로그인되어 있으면, 로그인된 계정의 정보를 따름
+    // 글을 생성한 회원 정보
     $mb = (isset($member['mb_id']) ? $member : get_member(ACTIVITYPUB_G5_USERNAME));
 
     // 추가할 오브젝트 속성
@@ -1587,7 +1581,7 @@ function _activitypub_comment_update_after($board, $wr_id, $w, $qstr, $redirect_
 
     // 글 전송하기
     if (!empty($mb['mb_id'])) {
-        $data = activitypub_publish_content(
+        activitypub_publish_content(
             $row['wr_content'],
             G5_BBS_URL . "/board.php?bo_table={$board['bo_table']}&wr_id={$row['wr_parent']}&c_id=" . $comment_id,
             $mb,
@@ -1633,6 +1627,12 @@ switch ($route) {
         _GNUBOARD_ActivityPub::close();
         break;
 
+    case "activitypub.activity":
+        _GNUBOARD_ActivityPub::open();
+        echo _GNUBOARD_ActivityPub::activity();
+        _GNUBOARD_ActivityPub::close();
+        break;
+
     case "activitypub.inbox":
         _GNUBOARD_ActivityPub::open();
         echo _GNUBOARD_ActivityPub::inbox();
@@ -1669,7 +1669,7 @@ switch ($route) {
         _GNUBOARD_ActivityPub::close();
         break;
         
-    case "oauth2.authorize":  // TODO
+    case "oauth2.authorize":  // Not implemented
         _GNUBOARD_ActivityPub::open();
         echo _GNUBOARD_ActivityPub::authorize();
         _GNUBOARD_ActivityPub::close();