From f7ebc8831b032196e6695fa22647717a7bf2b55c Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Sun, 22 Aug 2021 14:52:40 +0300
Subject: ActivityPub: fix empty object serialization

---
 .../api/activity/helpers/ContextTypeFilter.java    | 29 ++++++++++++++++++++++
 .../com/juick/www/api/activity/model/Context.java  |  2 ++
 .../java/com/juick/server/tests/ServerTests.java   |  7 +++++-
 3 files changed, 37 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/com/juick/www/api/activity/helpers/ContextTypeFilter.java

diff --git a/src/main/java/com/juick/www/api/activity/helpers/ContextTypeFilter.java b/src/main/java/com/juick/www/api/activity/helpers/ContextTypeFilter.java
new file mode 100644
index 00000000..e8a1dfab
--- /dev/null
+++ b/src/main/java/com/juick/www/api/activity/helpers/ContextTypeFilter.java
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2008-2021, Juick
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.juick.www.api.activity.helpers;
+
+public class ContextTypeFilter {
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null || !(obj instanceof String)) {
+            return true;
+        }
+        return ((String)obj).equals("Context");
+    }
+}
diff --git a/src/main/java/com/juick/www/api/activity/model/Context.java b/src/main/java/com/juick/www/api/activity/model/Context.java
index f5d95d24..66259b7b 100644
--- a/src/main/java/com/juick/www/api/activity/model/Context.java
+++ b/src/main/java/com/juick/www/api/activity/model/Context.java
@@ -19,6 +19,7 @@ package com.juick.www.api.activity.model;
 
 import com.fasterxml.jackson.annotation.*;
 import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.juick.www.api.activity.helpers.ContextTypeFilter;
 import com.juick.www.api.activity.helpers.LinkValueDeserializer;
 import com.juick.www.api.activity.model.activities.*;
 import com.juick.www.api.activity.model.objects.*;
@@ -78,6 +79,7 @@ public class Context {
         this.id = id;
     }
 
+    @JsonInclude(value = JsonInclude.Include.CUSTOM, valueFilter = ContextTypeFilter.class)
     public String getType() {
         return getClass().getSimpleName();
     }
diff --git a/src/test/java/com/juick/server/tests/ServerTests.java b/src/test/java/com/juick/server/tests/ServerTests.java
index db1449f2..bdca6cd2 100644
--- a/src/test/java/com/juick/server/tests/ServerTests.java
+++ b/src/test/java/com/juick/server/tests/ServerTests.java
@@ -41,7 +41,6 @@ import com.juick.www.api.activity.model.Context;
 import com.juick.www.api.activity.model.activities.*;
 import com.juick.www.api.activity.model.objects.Actor;
 import com.juick.www.api.activity.model.objects.Application;
-import com.juick.www.api.activity.model.objects.Image;
 import com.juick.www.api.activity.model.objects.Note;
 import com.juick.www.api.activity.model.objects.Person;
 import com.juick.www.api.webfinger.model.Account;
@@ -2384,4 +2383,10 @@ public class ServerTests {
         mockMvc.perform(get("/api/messages").header("Accept", "application/xml")).andExpect(status().isBadRequest())
         .andExpect(content().string("Invalid media type"));
     }
+    @Test
+    public void emptyContextShouldNotSerializeType() throws Exception {
+        Context context = new Context("http://juick.com/u/ermine");
+        String contextString = jsonMapper.writeValueAsString(context);
+        assertThat(contextString, is("{\"id\":\"http://juick.com/u/ermine\"}"));
+    }
 }
-- 
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