From 9fd4ce97047f8c4ffd2bd3374b0288b53580f34b Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Thu, 4 Oct 2018 17:06:15 +0300
Subject: ActivityPub: broadcast message deletion

---
 .../java/com/juick/server/ActivityPubManager.java  | 29 +++++++++++++++++++---
 .../java/com/juick/server/CommandsManager.java     |  5 +++-
 .../juick/service/activities/ActivityListener.java |  2 ++
 .../service/activities/DeleteMessageEvent.java     | 21 ++++++++++++++++
 4 files changed, 52 insertions(+), 5 deletions(-)
 create mode 100644 juick-server/src/main/java/com/juick/service/activities/DeleteMessageEvent.java

diff --git a/juick-server/src/main/java/com/juick/server/ActivityPubManager.java b/juick-server/src/main/java/com/juick/server/ActivityPubManager.java
index c05deb15..49895bc8 100644
--- a/juick-server/src/main/java/com/juick/server/ActivityPubManager.java
+++ b/juick-server/src/main/java/com/juick/server/ActivityPubManager.java
@@ -7,11 +7,9 @@ import com.juick.server.api.activity.model.Note;
 import com.juick.server.api.activity.model.Person;
 import com.juick.server.api.activity.model.activities.Accept;
 import com.juick.server.api.activity.model.activities.Create;
+import com.juick.server.api.activity.model.activities.Delete;
 import com.juick.service.SocialService;
-import com.juick.service.activities.ActivityListener;
-import com.juick.service.activities.DeleteUserEvent;
-import com.juick.service.activities.FollowEvent;
-import com.juick.service.activities.UndoFollowEvent;
+import com.juick.service.activities.*;
 import com.juick.service.component.*;
 import com.juick.util.MessageUtils;
 import org.apache.commons.lang3.StringUtils;
@@ -87,6 +85,29 @@ public class ActivityPubManager implements ActivityListener, NotificationListene
         socialService.removeAccount(acct);
     }
 
+    @Override
+    public void deleteMessageEvent(DeleteMessageEvent event) {
+        Message msg = event.getMessage();
+        User user = msg.getUser();
+        String userUri = personUri(user);
+        Note note = makeNote(msg);
+        Person me = (Person) signatureManager.getContext(URI.create(userUri)).get();
+        socialService.getFollowers(user).forEach(acct -> {
+            Person follower = (Person) signatureManager.getContext(URI.create(acct)).get();
+            Delete delete = new Delete();
+            delete.setId(note.getId());
+            delete.setActor(me.getId());
+            delete.setPublished(note.getPublished());
+            delete.setObject(note);
+            try {
+                logger.info("Deletion to follower {}", follower.getId());
+                signatureManager.post(me, follower, delete);
+            } catch (IOException e) {
+                logger.warn("activitypub exception", e);
+            }
+        });
+    }
+
     @Override
     public void processMessageEvent(MessageEvent messageEvent) {
         Message msg = messageEvent.getMessage();
diff --git a/juick-server/src/main/java/com/juick/server/CommandsManager.java b/juick-server/src/main/java/com/juick/server/CommandsManager.java
index e9cf11de..297e986f 100644
--- a/juick-server/src/main/java/com/juick/server/CommandsManager.java
+++ b/juick-server/src/main/java/com/juick/server/CommandsManager.java
@@ -21,6 +21,7 @@ import com.juick.Message;
 import com.juick.Tag;
 import com.juick.User;
 import com.juick.formatters.PlainTextFormatter;
+import com.juick.service.activities.DeleteMessageEvent;
 import com.juick.service.component.*;
 import com.juick.model.CommandResult;
 import com.juick.model.TagStats;
@@ -446,7 +447,9 @@ public class CommandsManager {
     @UserCommand(pattern = "^D #(\\d+)$", help = "D #1234 - Delete post", patternFlags = Pattern.CASE_INSENSITIVE)
     public CommandResult commandDeletePost(User user, URI attachment, String... args) {
         int mid = Integer.valueOf(args[0]);
-        if (messagesService.deleteMessage(user.getUid(), mid)) {
+        Message message = messagesService.getMessage(mid);
+        if (message != null && messagesService.deleteMessage(user.getUid(), mid)) {
+            applicationEventPublisher.publishEvent(new DeleteMessageEvent(this, message));
             return CommandResult.fromString("Message deleted");
         }
         return CommandResult.fromString("This is not your message");
diff --git a/juick-server/src/main/java/com/juick/service/activities/ActivityListener.java b/juick-server/src/main/java/com/juick/service/activities/ActivityListener.java
index 01baeea9..3174ff23 100644
--- a/juick-server/src/main/java/com/juick/service/activities/ActivityListener.java
+++ b/juick-server/src/main/java/com/juick/service/activities/ActivityListener.java
@@ -9,4 +9,6 @@ public interface ActivityListener {
     void undoFollowEvent(UndoFollowEvent event);
     @EventListener
     void deleteUserEvent(DeleteUserEvent event);
+    @EventListener
+    void deleteMessageEvent(DeleteMessageEvent event);
 }
diff --git a/juick-server/src/main/java/com/juick/service/activities/DeleteMessageEvent.java b/juick-server/src/main/java/com/juick/service/activities/DeleteMessageEvent.java
new file mode 100644
index 00000000..67e40f44
--- /dev/null
+++ b/juick-server/src/main/java/com/juick/service/activities/DeleteMessageEvent.java
@@ -0,0 +1,21 @@
+package com.juick.service.activities;
+
+import com.juick.Message;
+import org.springframework.context.ApplicationEvent;
+
+public class DeleteMessageEvent extends ApplicationEvent {
+    private Message message;
+    /**
+     * Create a new ApplicationEvent.
+     *
+     * @param source the object on which the event initially occurred (never {@code null})
+     */
+    public DeleteMessageEvent(Object source, Message message) {
+        super(source);
+        this.message = message;
+    }
+
+    public Message getMessage() {
+        return message;
+    }
+}
-- 
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