From 873fbbc8b7f59c68c6bf37ff9af79c8fb2aef8ed Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Thu, 4 Oct 2018 13:59:28 +0300
Subject: ActivityPub: handle Undo following requests

---
 .../java/com/juick/server/ActivityPubManager.java  | 17 ++++++++++++--
 .../com/juick/server/api/activity/Profile.java     |  3 +++
 .../juick/service/activities/ActivityListener.java | 10 ++++++++
 .../juick/service/activities/UndoFollowEvent.java  | 27 ++++++++++++++++++++++
 4 files changed, 55 insertions(+), 2 deletions(-)
 create mode 100644 juick-server/src/main/java/com/juick/service/activities/ActivityListener.java
 create mode 100644 juick-server/src/main/java/com/juick/service/activities/UndoFollowEvent.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 223d28fd..17522423 100644
--- a/juick-server/src/main/java/com/juick/server/ActivityPubManager.java
+++ b/juick-server/src/main/java/com/juick/server/ActivityPubManager.java
@@ -8,7 +8,9 @@ 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.service.SocialService;
+import com.juick.service.activities.ActivityListener;
 import com.juick.service.activities.FollowEvent;
+import com.juick.service.activities.UndoFollowEvent;
 import com.juick.service.component.*;
 import com.juick.util.MessageUtils;
 import org.apache.commons.lang3.StringUtils;
@@ -27,7 +29,7 @@ import java.net.URI;
 import java.util.Collections;
 
 @Component
-public class ActivityPubManager implements ApplicationListener<FollowEvent>, NotificationListener {
+public class ActivityPubManager implements ActivityListener, NotificationListener {
     private static final Logger logger = LoggerFactory.getLogger(ActivityPubManager.class);
     @Inject
     SignatureManager signatureManager;
@@ -46,7 +48,7 @@ public class ActivityPubManager implements ApplicationListener<FollowEvent>, Not
     }
 
     @Override
-    public void onApplicationEvent(@Nonnull FollowEvent followEvent) {
+    public void processFollowEvent(@Nonnull FollowEvent followEvent) {
         String acct = (String)followEvent.getRequest().getObject();
         logger.info("received follower request to {}", acct);
         User followedUser = socialService.getUserByAccountUri(acct);
@@ -67,6 +69,17 @@ public class ActivityPubManager implements ApplicationListener<FollowEvent>, Not
         }
     }
 
+    @Override
+    public void undoFollowEvent(UndoFollowEvent event) {
+        String actor = event.getActor();
+        String me = (String)event.getFollowRequest().getObject();
+        logger.info("{} stopping to follow {}", actor, me);
+        User followedUser = socialService.getUserByAccountUri(me);
+        if (!followedUser.isAnonymous()) {
+            socialService.removeFollower(followedUser, actor);
+        }
+    }
+
     @Override
     public void processMessageEvent(MessageEvent messageEvent) {
         Message msg = messageEvent.getMessage();
diff --git a/juick-server/src/main/java/com/juick/server/api/activity/Profile.java b/juick-server/src/main/java/com/juick/server/api/activity/Profile.java
index 7b854d52..2e089330 100644
--- a/juick-server/src/main/java/com/juick/server/api/activity/Profile.java
+++ b/juick-server/src/main/java/com/juick/server/api/activity/Profile.java
@@ -13,6 +13,7 @@ import com.juick.server.util.UserUtils;
 import com.juick.service.MessagesService;
 import com.juick.service.UserService;
 import com.juick.service.activities.FollowEvent;
+import com.juick.service.activities.UndoFollowEvent;
 import com.juick.util.MessageUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.springframework.beans.factory.annotation.Value;
@@ -239,6 +240,8 @@ public class Profile {
             return new ResponseEntity<>(HttpStatus.UNAUTHORIZED);
         }
         if (activity instanceof Undo) {
+            Follow undoFollow = (Follow) ((Undo) activity).getObject();
+            applicationEventPublisher.publishEvent(new UndoFollowEvent(this, ((Undo) activity).getActor(), undoFollow));
             return new ResponseEntity<>(HttpStatus.OK);
         }
         return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
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
new file mode 100644
index 00000000..f89b401d
--- /dev/null
+++ b/juick-server/src/main/java/com/juick/service/activities/ActivityListener.java
@@ -0,0 +1,10 @@
+package com.juick.service.activities;
+
+import org.springframework.context.event.EventListener;
+
+public interface ActivityListener {
+    @EventListener
+    void processFollowEvent(FollowEvent event);
+    @EventListener
+    void undoFollowEvent(UndoFollowEvent event);
+}
diff --git a/juick-server/src/main/java/com/juick/service/activities/UndoFollowEvent.java b/juick-server/src/main/java/com/juick/service/activities/UndoFollowEvent.java
new file mode 100644
index 00000000..fa162b2e
--- /dev/null
+++ b/juick-server/src/main/java/com/juick/service/activities/UndoFollowEvent.java
@@ -0,0 +1,27 @@
+package com.juick.service.activities;
+
+import com.juick.server.api.activity.model.activities.Follow;
+import org.springframework.context.ApplicationEvent;
+
+public class UndoFollowEvent extends ApplicationEvent {
+    private String actor;
+    private Follow followRequest;
+    /**
+     * Create a new ApplicationEvent.
+     *
+     * @param source the object on which the event initially occurred (never {@code null})
+     */
+    public UndoFollowEvent(Object source, String actor, Follow object) {
+        super(source);
+        this.actor = actor;
+        this.followRequest = object;
+    }
+
+    public String getActor() {
+        return actor;
+    }
+
+    public Follow getFollowRequest() {
+        return followRequest;
+    }
+}
-- 
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