From 5a2b506b5ecb56793807aacb47b7615bba80a7cc Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Wed, 10 Oct 2018 15:40:15 +0300
Subject: ActivityPub: clean up 410 followers

---
 .../java/com/juick/server/ActivityPubManager.java  | 27 +++++++++++++---------
 .../java/com/juick/server/SignatureManager.java    |  6 +++++
 .../com/juick/server/api/activity/Profile.java     |  3 +++
 3 files changed, 25 insertions(+), 11 deletions(-)

(limited to 'juick-server/src/main/java/com')

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 5aecdd33..d494154c 100644
--- a/juick-server/src/main/java/com/juick/server/ActivityPubManager.java
+++ b/juick-server/src/main/java/com/juick/server/ActivityPubManager.java
@@ -3,6 +3,7 @@ package com.juick.server;
 import com.juick.Message;
 import com.juick.User;
 import com.juick.formatters.PlainTextFormatter;
+import com.juick.server.api.activity.model.Context;
 import com.juick.server.api.activity.model.Image;
 import com.juick.server.api.activity.model.Note;
 import com.juick.server.api.activity.model.Person;
@@ -29,6 +30,7 @@ import javax.inject.Inject;
 import java.io.IOException;
 import java.net.URI;
 import java.util.Collections;
+import java.util.Optional;
 
 @Component
 public class ActivityPubManager implements ActivityListener, NotificationListener {
@@ -125,17 +127,20 @@ public class ActivityPubManager implements ActivityListener, NotificationListene
         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();
-            Create create = new Create();
-            create.setId(note.getId());
-            create.setActor(me.getId());
-            create.setPublished(note.getPublished());
-            create.setObject(note);
-            try {
-                logger.info("Posting to follower {}", follower.getId());
-                signatureManager.post(me, follower, create);
-            } catch (IOException e) {
-                logger.warn("activitypub exception", e);
+            Optional<Context> context = signatureManager.getContext(URI.create(acct));
+            if (context.isPresent()) {
+                Person follower = (Person)context.get();
+                Create create = new Create();
+                create.setId(note.getId());
+                create.setActor(me.getId());
+                create.setPublished(note.getPublished());
+                create.setObject(note);
+                try {
+                    logger.info("Posting to follower {}", follower.getId());
+                    signatureManager.post(me, follower, create);
+                } catch (IOException e) {
+                    logger.warn("activitypub exception", e);
+                }
             }
         });
     }
diff --git a/juick-server/src/main/java/com/juick/server/SignatureManager.java b/juick-server/src/main/java/com/juick/server/SignatureManager.java
index c39cdac9..869edbfc 100644
--- a/juick-server/src/main/java/com/juick/server/SignatureManager.java
+++ b/juick-server/src/main/java/com/juick/server/SignatureManager.java
@@ -3,10 +3,12 @@ package com.juick.server;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.juick.server.api.activity.model.Context;
 import com.juick.server.api.activity.model.Person;
+import com.juick.service.activities.DeleteUserEvent;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.http.HttpEntity;
 import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Component;
 import org.springframework.web.client.HttpClientErrorException;
@@ -83,6 +85,10 @@ public class SignatureManager {
             return Optional.of(new RestTemplate().getForEntity(contextUri, Context.class).getBody());
         } catch (HttpClientErrorException e) {
             logger.warn("Cannot identify {}", contextUri);
+            if (e.getStatusCode().equals(HttpStatus.GONE)) {
+                logger.warn("Server report {} is gone, deleting", contextUri);
+                new DeleteUserEvent(this, contextUri.toASCIIString());
+            }
         }
         return Optional.empty();
     }
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 669a28df..357ca29c 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
@@ -274,9 +274,12 @@ public class Profile {
         if (valid) {
             if (activity instanceof Follow) {
                 Follow followRequest = (Follow) activity;
+                String actor = followRequest.getActor();
+                Person follower = (Person) signatureManager.getContext(URI.create(actor)).orElseThrow(HttpBadRequestException::new);
                 applicationEventPublisher.publishEvent(
                         new FollowEvent(this, followRequest));
                 return new ResponseEntity<>(HttpStatus.ACCEPTED);
+
             }
             if (activity instanceof Undo) {
                 String follower = (String) ((Map) activity.getObject()).get("object");
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