From 8e6d764d6bb4391532e5376c795f634ee3898872 Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Wed, 10 Oct 2018 00:09:58 +0300
Subject: ActivityPub: Mentions and Hashtags

---
 .../java/com/juick/server/ActivityPubManager.java  | 29 +++++++++++++++++++---
 1 file changed, 25 insertions(+), 4 deletions(-)

(limited to 'juick-server/src/main/java/com/juick/server/ActivityPubManager.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 d494154c..4a6ed7be 100644
--- a/juick-server/src/main/java/com/juick/server/ActivityPubManager.java
+++ b/juick-server/src/main/java/com/juick/server/ActivityPubManager.java
@@ -4,9 +4,7 @@ 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;
+import com.juick.server.api.activity.model.objects.*;
 import com.juick.server.api.activity.model.activities.Accept;
 import com.juick.server.api.activity.model.activities.Announce;
 import com.juick.server.api.activity.model.activities.Create;
@@ -31,6 +29,7 @@ import java.io.IOException;
 import java.net.URI;
 import java.util.Collections;
 import java.util.Optional;
+import java.util.stream.Collectors;
 
 @Component
 public class ActivityPubManager implements ActivityListener, NotificationListener {
@@ -184,6 +183,10 @@ public class ActivityPubManager implements ActivityListener, NotificationListene
         uri.replacePath(String.format("/n/%d-%d", mid, rid));
         return uri.toUriString();
     }
+    public String tagUri(com.juick.Tag tag) {
+        UriComponentsBuilder uri = UriComponentsBuilder.fromUriString(baseUri);
+        return uri.replacePath(String.format("/t/%s", tag.getName())).toUriString();
+    }
 
     public Note makeNote(Message msg) {
         Note note = new Note();
@@ -204,7 +207,8 @@ public class ActivityPubManager implements ActivityListener, NotificationListene
             note.setCc(Collections.singletonList(followersUri(msg.getUser())));
         }
         note.setPublished(msg.getTimestamp());
-        note.setContent(msg.isHtml() ? msg.getText() : MessageUtils.formatMessage(msg.getText()));
+        note.setContent(msg.isHtml() ? msg.getText()
+                : MessageUtils.formatMessage(StringUtils.defaultString(msg.getText())));
         if (StringUtils.isNotBlank(msg.getAttachmentType())) {
             Image attachment = new Image();
             attachment.setId(msg.getAttachment().getMedium().getUrl());
@@ -212,6 +216,23 @@ public class ActivityPubManager implements ActivityListener, NotificationListene
             attachment.setMediaType(HttpUtils.mediaType(msg.getAttachmentType()));
             note.setAttachment(attachment);
         }
+        note.setTags(msg.getTags().stream().map(t -> {
+            Hashtag hashtag = new Hashtag();
+            hashtag.setId(tagUri(t));
+            hashtag.setName("#" + t.getName());
+            return hashtag;
+        }).collect(Collectors.toList()));
+        if (msg.getReplyToUri().toASCIIString().length() > 0) {
+            Optional<Context> createContext = signatureManager.getContext(msg.getReplyToUri());
+            if (createContext.isPresent()) {
+                Create activity = (Create) createContext.get();
+                Optional<Context> personContext = signatureManager.getContext(URI.create(activity.getActor()));
+                if (personContext.isPresent()) {
+                    Person person = (Person) personContext.get();
+                    note.getTags().add(new Mention(person.getUrl(), person.getPreferredUsername()));
+                }
+            }
+        }
         return note;
     }
 
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