Merge branch 'remake-remodel-dms' into 'develop'

Chats / ChatMessages See merge request pleroma/pleroma!2429
2020-06-10 12:05:45 +00:00 · 2020-06-10 12:05:45 +00:00 · 7aa6c82937
commit 7aa6c82937
parent 1b746cfbbb 064c4f86f3
79 changed files with 3907 additions and 148 deletions
--- a/test/chat/message_reference_test.exs
+++ b/test/chat/message_reference_test.exs
@ -0,0 +1,29 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Chat.MessageReferenceTest do
+  use Pleroma.DataCase, async: true
+
+  alias Pleroma.Chat
+  alias Pleroma.Chat.MessageReference
+  alias Pleroma.Web.CommonAPI
+
+  import Pleroma.Factory
+
+  describe "messages" do
+    test "it returns the last message in a chat" do
+      user = insert(:user)
+      recipient = insert(:user)
+
+      {:ok, _message_1} = CommonAPI.post_chat_message(user, recipient, "hey")
+      {:ok, _message_2} = CommonAPI.post_chat_message(recipient, user, "ho")
+
+      {:ok, chat} = Chat.get_or_create(user.id, recipient.ap_id)
+
+      message = MessageReference.last_message_for_chat(chat)
+
+      assert message.object.data["content"] == "ho"
+    end
+  end
+end
--- a/test/chat_test.exs
+++ b/test/chat_test.exs
@ -0,0 +1,61 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.ChatTest do
+  use Pleroma.DataCase, async: true
+
+  alias Pleroma.Chat
+
+  import Pleroma.Factory
+
+  describe "creation and getting" do
+    test "it only works if the recipient is a valid user (for now)" do
+      user = insert(:user)
+
+      assert {:error, _chat} = Chat.bump_or_create(user.id, "http://some/nonexisting/account")
+      assert {:error, _chat} = Chat.get_or_create(user.id, "http://some/nonexisting/account")
+    end
+
+    test "it creates a chat for a user and recipient" do
+      user = insert(:user)
+      other_user = insert(:user)
+
+      {:ok, chat} = Chat.bump_or_create(user.id, other_user.ap_id)
+
+      assert chat.id
+    end
+
+    test "it returns and bumps a chat for a user and recipient if it already exists" do
+      user = insert(:user)
+      other_user = insert(:user)
+
+      {:ok, chat} = Chat.bump_or_create(user.id, other_user.ap_id)
+      {:ok, chat_two} = Chat.bump_or_create(user.id, other_user.ap_id)
+
+      assert chat.id == chat_two.id
+    end
+
+    test "it returns a chat for a user and recipient if it already exists" do
+      user = insert(:user)
+      other_user = insert(:user)
+
+      {:ok, chat} = Chat.get_or_create(user.id, other_user.ap_id)
+      {:ok, chat_two} = Chat.get_or_create(user.id, other_user.ap_id)
+
+      assert chat.id == chat_two.id
+    end
+
+    test "a returning chat will have an updated `update_at` field" do
+      user = insert(:user)
+      other_user = insert(:user)
+
+      {:ok, chat} = Chat.bump_or_create(user.id, other_user.ap_id)
+      :timer.sleep(1500)
+      {:ok, chat_two} = Chat.bump_or_create(user.id, other_user.ap_id)
+
+      assert chat.id == chat_two.id
+      assert chat.updated_at != chat_two.updated_at
+    end
+  end
+end
--- a/test/fixtures/create-chat-message.json
+++ b/test/fixtures/create-chat-message.json
@ -0,0 +1,31 @@
+{
+  "actor": "http://2hu.gensokyo/users/raymoo",
+  "id": "http://2hu.gensokyo/objects/1",
+  "object": {
+    "attributedTo": "http://2hu.gensokyo/users/raymoo",
+    "content": "You expected a cute girl? Too bad. <script>alert('XSS')</script>",
+    "id": "http://2hu.gensokyo/objects/2",
+    "published": "2020-02-12T14:08:20Z",
+    "to": [
+      "http://2hu.gensokyo/users/marisa"
+    ],
+    "tag": [
+      {
+        "icon": {
+          "type": "Image",
+          "url": "http://2hu.gensokyo/emoji/Firefox.gif"
+        },
+        "id": "http://2hu.gensokyo/emoji/Firefox.gif",
+        "name": ":firefox:",
+        "type": "Emoji",
+        "updated": "1970-01-01T00:00:00Z"
+      }
+    ],
+    "type": "ChatMessage"
+  },
+  "published": "2018-02-12T14:08:20Z",
+  "to": [
+    "http://2hu.gensokyo/users/marisa"
+  ],
+  "type": "Create"
+}
--- a/test/migration_helper/notification_backfill_test.exs
+++ b/test/migration_helper/notification_backfill_test.exs
@ -0,0 +1,56 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.MigrationHelper.NotificationBackfillTest do
+  use Pleroma.DataCase
+
+  alias Pleroma.Activity
+  alias Pleroma.MigrationHelper.NotificationBackfill
+  alias Pleroma.Notification
+  alias Pleroma.Repo
+  alias Pleroma.Web.CommonAPI
+
+  import Pleroma.Factory
+
+  describe "fill_in_notification_types" do
+    test "it fills in missing notification types" do
+      user = insert(:user)
+      other_user = insert(:user)
+
+      {:ok, post} = CommonAPI.post(user, %{status: "yeah, @#{other_user.nickname}"})
+      {:ok, chat} = CommonAPI.post_chat_message(user, other_user, "yo")
+      {:ok, react} = CommonAPI.react_with_emoji(post.id, other_user, "☕")
+      {:ok, like} = CommonAPI.favorite(other_user, post.id)
+      {:ok, react_2} = CommonAPI.react_with_emoji(post.id, other_user, "☕")
+
+      data =
+        react_2.data
+        |> Map.put("type", "EmojiReaction")
+
+      {:ok, react_2} =
+        react_2
+        |> Activity.change(%{data: data})
+        |> Repo.update()
+
+      assert {5, nil} = Repo.update_all(Notification, set: [type: nil])
+
+      NotificationBackfill.fill_in_notification_types()
+
+      assert %{type: "mention"} =
+               Repo.get_by(Notification, user_id: other_user.id, activity_id: post.id)
+
+      assert %{type: "favourite"} =
+               Repo.get_by(Notification, user_id: user.id, activity_id: like.id)
+
+      assert %{type: "pleroma:emoji_reaction"} =
+               Repo.get_by(Notification, user_id: user.id, activity_id: react.id)
+
+      assert %{type: "pleroma:emoji_reaction"} =
+               Repo.get_by(Notification, user_id: user.id, activity_id: react_2.id)
+
+      assert %{type: "pleroma:chat_mention"} =
+               Repo.get_by(Notification, user_id: other_user.id, activity_id: chat.id)
+    end
+  end
+end
--- a/test/notification_test.exs
+++ b/test/notification_test.exs
@ -10,6 +10,7 @@ defmodule Pleroma.NotificationTest do

  alias Pleroma.FollowingRelationship
  alias Pleroma.Notification
+  alias Pleroma.Repo
  alias Pleroma.Tests.ObanHelpers
  alias Pleroma.User
  alias Pleroma.Web.ActivityPub.ActivityPub
@ -31,6 +32,7 @@ defmodule Pleroma.NotificationTest do
      {:ok, [notification]} = Notification.create_notifications(activity)

      assert notification.user_id == user.id
+      assert notification.type == "pleroma:emoji_reaction"
    end

    test "notifies someone when they are directly addressed" do
@ -48,6 +50,7 @@ defmodule Pleroma.NotificationTest do
      notified_ids = Enum.sort([notification.user_id, other_notification.user_id])
      assert notified_ids == [other_user.id, third_user.id]
      assert notification.activity_id == activity.id
+      assert notification.type == "mention"
      assert other_notification.activity_id == activity.id

      assert [%Pleroma.Marker{unread_count: 2}] =
@ -335,9 +338,12 @@ defmodule Pleroma.NotificationTest do
      # After request is accepted, the same notification is rendered with type "follow":
      assert {:ok, _} = CommonAPI.accept_follow_request(user, followed_user)

-      notification_id = notification.id
-      assert [%{id: ^notification_id}] = Notification.for_user(followed_user)
-      assert %{type: "follow"} = NotificationView.render("show.json", render_opts)
+      notification =
+        Repo.get(Notification, notification.id)
+        |> Repo.preload(:activity)
+
+      assert %{type: "follow"} =
+               NotificationView.render("show.json", notification: notification, for: followed_user)
    end

    test "it doesn't create a notification for follow-unfollow-follow chains" do
--- a/test/upload_test.exs
+++ b/test/upload_test.exs
@ -54,6 +54,7 @@ defmodule Pleroma.UploadTest do
                %{
                  "name" => "image.jpg",
                  "type" => "Document",
+                  "mediaType" => "image/jpeg",
                  "url" => [
                    %{
                      "href" => "http://localhost:4001/media/post-process-file.jpg",
--- a/test/web/activity_pub/object_validator_test.exs
+++ b/test/web/activity_pub/object_validator_test.exs
@ -2,14 +2,264 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidatorTest do
  use Pleroma.DataCase

  alias Pleroma.Object
+  alias Pleroma.Web.ActivityPub.ActivityPub
  alias Pleroma.Web.ActivityPub.Builder
  alias Pleroma.Web.ActivityPub.ObjectValidator
+  alias Pleroma.Web.ActivityPub.ObjectValidators.AttachmentValidator
  alias Pleroma.Web.ActivityPub.ObjectValidators.LikeValidator
  alias Pleroma.Web.ActivityPub.Utils
  alias Pleroma.Web.CommonAPI

  import Pleroma.Factory

+  describe "attachments" do
+    test "works with honkerific attachments" do
+      attachment = %{
+        "mediaType" => "",
+        "name" => "",
+        "summary" => "298p3RG7j27tfsZ9RQ.jpg",
+        "type" => "Document",
+        "url" => "https://honk.tedunangst.com/d/298p3RG7j27tfsZ9RQ.jpg"
+      }
+
+      assert {:ok, attachment} =
+               AttachmentValidator.cast_and_validate(attachment)
+               |> Ecto.Changeset.apply_action(:insert)
+
+      assert attachment.mediaType == "application/octet-stream"
+    end
+
+    test "it turns mastodon attachments into our attachments" do
+      attachment = %{
+        "url" =>
+          "http://mastodon.example.org/system/media_attachments/files/000/000/002/original/334ce029e7bfb920.jpg",
+        "type" => "Document",
+        "name" => nil,
+        "mediaType" => "image/jpeg"
+      }
+
+      {:ok, attachment} =
+        AttachmentValidator.cast_and_validate(attachment)
+        |> Ecto.Changeset.apply_action(:insert)
+
+      assert [
+               %{
+                 href:
+                   "http://mastodon.example.org/system/media_attachments/files/000/000/002/original/334ce029e7bfb920.jpg",
+                 type: "Link",
+                 mediaType: "image/jpeg"
+               }
+             ] = attachment.url
+
+      assert attachment.mediaType == "image/jpeg"
+    end
+
+    test "it handles our own uploads" do
+      user = insert(:user)
+
+      file = %Plug.Upload{
+        content_type: "image/jpg",
+        path: Path.absname("test/fixtures/image.jpg"),
+        filename: "an_image.jpg"
+      }
+
+      {:ok, attachment} = ActivityPub.upload(file, actor: user.ap_id)
+
+      {:ok, attachment} =
+        attachment.data
+        |> AttachmentValidator.cast_and_validate()
+        |> Ecto.Changeset.apply_action(:insert)
+
+      assert attachment.mediaType == "image/jpeg"
+    end
+  end
+
+  describe "chat message create activities" do
+    test "it is invalid if the object already exists" do
+      user = insert(:user)
+      recipient = insert(:user)
+      {:ok, activity} = CommonAPI.post_chat_message(user, recipient, "hey")
+      object = Object.normalize(activity, false)
+
+      {:ok, create_data, _} = Builder.create(user, object.data, [recipient.ap_id])
+
+      {:error, cng} = ObjectValidator.validate(create_data, [])
+
+      assert {:object, {"The object to create already exists", []}} in cng.errors
+    end
+
+    test "it is invalid if the object data has a different `to` or `actor` field" do
+      user = insert(:user)
+      recipient = insert(:user)
+      {:ok, object_data, _} = Builder.chat_message(recipient, user.ap_id, "Hey")
+
+      {:ok, create_data, _} = Builder.create(user, object_data, [recipient.ap_id])
+
+      {:error, cng} = ObjectValidator.validate(create_data, [])
+
+      assert {:to, {"Recipients don't match with object recipients", []}} in cng.errors
+      assert {:actor, {"Actor doesn't match with object actor", []}} in cng.errors
+    end
+  end
+
+  describe "chat messages" do
+    setup do
+      clear_config([:instance, :remote_limit])
+      user = insert(:user)
+      recipient = insert(:user, local: false)
+
+      {:ok, valid_chat_message, _} = Builder.chat_message(user, recipient.ap_id, "hey :firefox:")
+
+      %{user: user, recipient: recipient, valid_chat_message: valid_chat_message}
+    end
+
+    test "let's through some basic html", %{user: user, recipient: recipient} do
+      {:ok, valid_chat_message, _} =
+        Builder.chat_message(
+          user,
+          recipient.ap_id,
+          "hey <a href='https://example.org'>example</a> <script>alert('uguu')</script>"
+        )
+
+      assert {:ok, object, _meta} = ObjectValidator.validate(valid_chat_message, [])
+
+      assert object["content"] ==
+               "hey <a href=\"https://example.org\">example</a> alert(&#39;uguu&#39;)"
+    end
+
+    test "validates for a basic object we build", %{valid_chat_message: valid_chat_message} do
+      assert {:ok, object, _meta} = ObjectValidator.validate(valid_chat_message, [])
+
+      assert Map.put(valid_chat_message, "attachment", nil) == object
+    end
+
+    test "validates for a basic object with an attachment", %{
+      valid_chat_message: valid_chat_message,
+      user: user
+    } do
+      file = %Plug.Upload{
+        content_type: "image/jpg",
+        path: Path.absname("test/fixtures/image.jpg"),
+        filename: "an_image.jpg"
+      }
+
+      {:ok, attachment} = ActivityPub.upload(file, actor: user.ap_id)
+
+      valid_chat_message =
+        valid_chat_message
+        |> Map.put("attachment", attachment.data)
+
+      assert {:ok, object, _meta} = ObjectValidator.validate(valid_chat_message, [])
+
+      assert object["attachment"]
+    end
+
+    test "validates for a basic object with an attachment in an array", %{
+      valid_chat_message: valid_chat_message,
+      user: user
+    } do
+      file = %Plug.Upload{
+        content_type: "image/jpg",
+        path: Path.absname("test/fixtures/image.jpg"),
+        filename: "an_image.jpg"
+      }
+
+      {:ok, attachment} = ActivityPub.upload(file, actor: user.ap_id)
+
+      valid_chat_message =
+        valid_chat_message
+        |> Map.put("attachment", [attachment.data])
+
+      assert {:ok, object, _meta} = ObjectValidator.validate(valid_chat_message, [])
+
+      assert object["attachment"]
+    end
+
+    test "validates for a basic object with an attachment but without content", %{
+      valid_chat_message: valid_chat_message,
+      user: user
+    } do
+      file = %Plug.Upload{
+        content_type: "image/jpg",
+        path: Path.absname("test/fixtures/image.jpg"),
+        filename: "an_image.jpg"
+      }
+
+      {:ok, attachment} = ActivityPub.upload(file, actor: user.ap_id)
+
+      valid_chat_message =
+        valid_chat_message
+        |> Map.put("attachment", attachment.data)
+        |> Map.delete("content")
+
+      assert {:ok, object, _meta} = ObjectValidator.validate(valid_chat_message, [])
+
+      assert object["attachment"]
+    end
+
+    test "does not validate if the message has no content", %{
+      valid_chat_message: valid_chat_message
+    } do
+      contentless =
+        valid_chat_message
+        |> Map.delete("content")
+
+      refute match?({:ok, _object, _meta}, ObjectValidator.validate(contentless, []))
+    end
+
+    test "does not validate if the message is longer than the remote_limit", %{
+      valid_chat_message: valid_chat_message
+    } do
+      Pleroma.Config.put([:instance, :remote_limit], 2)
+      refute match?({:ok, _object, _meta}, ObjectValidator.validate(valid_chat_message, []))
+    end
+
+    test "does not validate if the recipient is blocking the actor", %{
+      valid_chat_message: valid_chat_message,
+      user: user,
+      recipient: recipient
+    } do
+      Pleroma.User.block(recipient, user)
+      refute match?({:ok, _object, _meta}, ObjectValidator.validate(valid_chat_message, []))
+    end
+
+    test "does not validate if the actor or the recipient is not in our system", %{
+      valid_chat_message: valid_chat_message
+    } do
+      chat_message =
+        valid_chat_message
+        |> Map.put("actor", "https://raymoo.com/raymoo")
+
+      {:error, _} = ObjectValidator.validate(chat_message, [])
+
+      chat_message =
+        valid_chat_message
+        |> Map.put("to", ["https://raymoo.com/raymoo"])
+
+      {:error, _} = ObjectValidator.validate(chat_message, [])
+    end
+
+    test "does not validate for a message with multiple recipients", %{
+      valid_chat_message: valid_chat_message,
+      user: user,
+      recipient: recipient
+    } do
+      chat_message =
+        valid_chat_message
+        |> Map.put("to", [user.ap_id, recipient.ap_id])
+
+      assert {:error, _} = ObjectValidator.validate(chat_message, [])
+    end
+
+    test "does not validate if it doesn't concern local users" do
+      user = insert(:user, local: false)
+      recipient = insert(:user, local: false)
+
+      {:ok, valid_chat_message, _} = Builder.chat_message(user, recipient.ap_id, "hey")
+      assert {:error, _} = ObjectValidator.validate(valid_chat_message, [])
+    end
+  end
+
  describe "EmojiReacts" do
    setup do
      user = insert(:user)
--- a/test/web/activity_pub/object_validators/types/object_id_test.exs
+++ b/test/web/activity_pub/object_validators/types/object_id_test.exs
@ -1,3 +1,7 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
 defmodule Pleroma.Web.ObjectValidators.Types.ObjectIDTest do
  alias Pleroma.Web.ActivityPub.ObjectValidators.Types.ObjectID
  use Pleroma.DataCase
--- a/test/web/activity_pub/object_validators/types/safe_text_test.exs
+++ b/test/web/activity_pub/object_validators/types/safe_text_test.exs
@ -0,0 +1,30 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.ObjectValidators.Types.SafeTextTest do
+  use Pleroma.DataCase
+
+  alias Pleroma.Web.ActivityPub.ObjectValidators.Types.SafeText
+
+  test "it lets normal text go through" do
+    text = "hey how are you"
+    assert {:ok, text} == SafeText.cast(text)
+  end
+
+  test "it removes html tags from text" do
+    text = "hey look xss <script>alert('foo')</script>"
+    assert {:ok, "hey look xss alert(&#39;foo&#39;)"} == SafeText.cast(text)
+  end
+
+  test "it keeps basic html tags" do
+    text = "hey <a href='http://gensokyo.2hu'>look</a> xss <script>alert('foo')</script>"
+
+    assert {:ok, "hey <a href=\"http://gensokyo.2hu\">look</a> xss alert(&#39;foo&#39;)"} ==
+             SafeText.cast(text)
+  end
+
+  test "errors for non-text" do
+    assert :error == SafeText.cast(1)
+  end
+end
--- a/test/web/activity_pub/pipeline_test.exs
+++ b/test/web/activity_pub/pipeline_test.exs
@ -33,7 +33,10 @@ defmodule Pleroma.Web.ActivityPub.PipelineTest do
        {
          Pleroma.Web.ActivityPub.SideEffects,
          [],
-          [handle: fn o, m -> {:ok, o, m} end]
+          [
+            handle: fn o, m -> {:ok, o, m} end,
+            handle_after_transaction: fn m -> m end
+          ]
        },
        {
          Pleroma.Web.Federator,
@ -71,7 +74,7 @@ defmodule Pleroma.Web.ActivityPub.PipelineTest do
        {
          Pleroma.Web.ActivityPub.SideEffects,
          [],
-          [handle: fn o, m -> {:ok, o, m} end]
+          [handle: fn o, m -> {:ok, o, m} end, handle_after_transaction: fn m -> m end]
        },
        {
          Pleroma.Web.Federator,
@ -110,7 +113,7 @@ defmodule Pleroma.Web.ActivityPub.PipelineTest do
        {
          Pleroma.Web.ActivityPub.SideEffects,
          [],
-          [handle: fn o, m -> {:ok, o, m} end]
+          [handle: fn o, m -> {:ok, o, m} end, handle_after_transaction: fn m -> m end]
        },
        {
          Pleroma.Web.Federator,
--- a/test/web/activity_pub/side_effects_test.exs
+++ b/test/web/activity_pub/side_effects_test.exs
@ -7,6 +7,8 @@ defmodule Pleroma.Web.ActivityPub.SideEffectsTest do
  use Pleroma.DataCase

  alias Pleroma.Activity
+  alias Pleroma.Chat
+  alias Pleroma.Chat.MessageReference
  alias Pleroma.Notification
  alias Pleroma.Object
  alias Pleroma.Repo
@ -20,6 +22,48 @@ defmodule Pleroma.Web.ActivityPub.SideEffectsTest do
  import Pleroma.Factory
  import Mock

+  describe "handle_after_transaction" do
+    test "it streams out notifications and streams" do
+      author = insert(:user, local: true)
+      recipient = insert(:user, local: true)
+
+      {:ok, chat_message_data, _meta} = Builder.chat_message(author, recipient.ap_id, "hey")
+
+      {:ok, create_activity_data, _meta} =
+        Builder.create(author, chat_message_data["id"], [recipient.ap_id])
+
+      {:ok, create_activity, _meta} = ActivityPub.persist(create_activity_data, local: false)
+
+      {:ok, _create_activity, meta} =
+        SideEffects.handle(create_activity, local: false, object_data: chat_message_data)
+
+      assert [notification] = meta[:notifications]
+
+      with_mocks([
+        {
+          Pleroma.Web.Streamer,
+          [],
+          [
+            stream: fn _, _ -> nil end
+          ]
+        },
+        {
+          Pleroma.Web.Push,
+          [],
+          [
+            send: fn _ -> nil end
+          ]
+        }
+      ]) do
+        SideEffects.handle_after_transaction(meta)
+
+        assert called(Pleroma.Web.Streamer.stream(["user", "user:notification"], notification))
+        assert called(Pleroma.Web.Streamer.stream(["user", "user:pleroma_chat"], :_))
+        assert called(Pleroma.Web.Push.send(notification))
+      end
+    end
+  end
+
  describe "delete objects" do
    setup do
      user = insert(:user)
@ -290,6 +334,147 @@ defmodule Pleroma.Web.ActivityPub.SideEffectsTest do
    end
  end

+  describe "creation of ChatMessages" do
+    test "notifies the recipient" do
+      author = insert(:user, local: false)
+      recipient = insert(:user, local: true)
+
+      {:ok, chat_message_data, _meta} = Builder.chat_message(author, recipient.ap_id, "hey")
+
+      {:ok, create_activity_data, _meta} =
+        Builder.create(author, chat_message_data["id"], [recipient.ap_id])
+
+      {:ok, create_activity, _meta} = ActivityPub.persist(create_activity_data, local: false)
+
+      {:ok, _create_activity, _meta} =
+        SideEffects.handle(create_activity, local: false, object_data: chat_message_data)
+
+      assert Repo.get_by(Notification, user_id: recipient.id, activity_id: create_activity.id)
+    end
+
+    test "it streams the created ChatMessage" do
+      author = insert(:user, local: true)
+      recipient = insert(:user, local: true)
+
+      {:ok, chat_message_data, _meta} = Builder.chat_message(author, recipient.ap_id, "hey")
+
+      {:ok, create_activity_data, _meta} =
+        Builder.create(author, chat_message_data["id"], [recipient.ap_id])
+
+      {:ok, create_activity, _meta} = ActivityPub.persist(create_activity_data, local: false)
+
+      {:ok, _create_activity, meta} =
+        SideEffects.handle(create_activity, local: false, object_data: chat_message_data)
+
+      assert [_, _] = meta[:streamables]
+    end
+
+    test "it creates a Chat and MessageReferences for the local users and bumps the unread count, except for the author" do
+      author = insert(:user, local: true)
+      recipient = insert(:user, local: true)
+
+      {:ok, chat_message_data, _meta} = Builder.chat_message(author, recipient.ap_id, "hey")
+
+      {:ok, create_activity_data, _meta} =
+        Builder.create(author, chat_message_data["id"], [recipient.ap_id])
+
+      {:ok, create_activity, _meta} = ActivityPub.persist(create_activity_data, local: false)
+
+      with_mocks([
+        {
+          Pleroma.Web.Streamer,
+          [],
+          [
+            stream: fn _, _ -> nil end
+          ]
+        },
+        {
+          Pleroma.Web.Push,
+          [],
+          [
+            send: fn _ -> nil end
+          ]
+        }
+      ]) do
+        {:ok, _create_activity, meta} =
+          SideEffects.handle(create_activity, local: false, object_data: chat_message_data)
+
+        # The notification gets created
+        assert [notification] = meta[:notifications]
+        assert notification.activity_id == create_activity.id
+
+        # But it is not sent out
+        refute called(Pleroma.Web.Streamer.stream(["user", "user:notification"], notification))
+        refute called(Pleroma.Web.Push.send(notification))
+
+        # Same for the user chat stream
+        assert [{topics, _}, _] = meta[:streamables]
+        assert topics == ["user", "user:pleroma_chat"]
+        refute called(Pleroma.Web.Streamer.stream(["user", "user:pleroma_chat"], :_))
+
+        chat = Chat.get(author.id, recipient.ap_id)
+
+        [cm_ref] = MessageReference.for_chat_query(chat) |> Repo.all()
+
+        assert cm_ref.object.data["content"] == "hey"
+        assert cm_ref.unread == false
+
+        chat = Chat.get(recipient.id, author.ap_id)
+
+        [cm_ref] = MessageReference.for_chat_query(chat) |> Repo.all()
+
+        assert cm_ref.object.data["content"] == "hey"
+        assert cm_ref.unread == true
+      end
+    end
+
+    test "it creates a Chat for the local users and bumps the unread count" do
+      author = insert(:user, local: false)
+      recipient = insert(:user, local: true)
+
+      {:ok, chat_message_data, _meta} = Builder.chat_message(author, recipient.ap_id, "hey")
+
+      {:ok, create_activity_data, _meta} =
+        Builder.create(author, chat_message_data["id"], [recipient.ap_id])
+
+      {:ok, create_activity, _meta} = ActivityPub.persist(create_activity_data, local: false)
+
+      {:ok, _create_activity, _meta} =
+        SideEffects.handle(create_activity, local: false, object_data: chat_message_data)
+
+      # An object is created
+      assert Object.get_by_ap_id(chat_message_data["id"])
+
+      # The remote user won't get a chat
+      chat = Chat.get(author.id, recipient.ap_id)
+      refute chat
+
+      # The local user will get a chat
+      chat = Chat.get(recipient.id, author.ap_id)
+      assert chat
+
+      author = insert(:user, local: true)
+      recipient = insert(:user, local: true)
+
+      {:ok, chat_message_data, _meta} = Builder.chat_message(author, recipient.ap_id, "hey")
+
+      {:ok, create_activity_data, _meta} =
+        Builder.create(author, chat_message_data["id"], [recipient.ap_id])
+
+      {:ok, create_activity, _meta} = ActivityPub.persist(create_activity_data, local: false)
+
+      {:ok, _create_activity, _meta} =
+        SideEffects.handle(create_activity, local: false, object_data: chat_message_data)
+
+      # Both users are local and get the chat
+      chat = Chat.get(author.id, recipient.ap_id)
+      assert chat
+
+      chat = Chat.get(recipient.id, author.ap_id)
+      assert chat
+    end
+  end
+
  describe "announce objects" do
    setup do
      poster = insert(:user)
--- a/test/web/activity_pub/transmogrifier/chat_message_test.exs
+++ b/test/web/activity_pub/transmogrifier/chat_message_test.exs
@ -0,0 +1,153 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.Transmogrifier.ChatMessageTest do
+  use Pleroma.DataCase
+
+  import Pleroma.Factory
+
+  alias Pleroma.Activity
+  alias Pleroma.Chat
+  alias Pleroma.Object
+  alias Pleroma.Web.ActivityPub.Transmogrifier
+
+  describe "handle_incoming" do
+    test "handles chonks with attachment" do
+      data = %{
+        "@context" => "https://www.w3.org/ns/activitystreams",
+        "actor" => "https://honk.tedunangst.com/u/tedu",
+        "id" => "https://honk.tedunangst.com/u/tedu/honk/x6gt8X8PcyGkQcXxzg1T",
+        "object" => %{
+          "attachment" => [
+            %{
+              "mediaType" => "image/jpeg",
+              "name" => "298p3RG7j27tfsZ9RQ.jpg",
+              "summary" => "298p3RG7j27tfsZ9RQ.jpg",
+              "type" => "Document",
+              "url" => "https://honk.tedunangst.com/d/298p3RG7j27tfsZ9RQ.jpg"
+            }
+          ],
+          "attributedTo" => "https://honk.tedunangst.com/u/tedu",
+          "content" => "",
+          "id" => "https://honk.tedunangst.com/u/tedu/chonk/26L4wl5yCbn4dr4y1b",
+          "published" => "2020-05-18T01:13:03Z",
+          "to" => [
+            "https://dontbulling.me/users/lain"
+          ],
+          "type" => "ChatMessage"
+        },
+        "published" => "2020-05-18T01:13:03Z",
+        "to" => [
+          "https://dontbulling.me/users/lain"
+        ],
+        "type" => "Create"
+      }
+
+      _user = insert(:user, ap_id: data["actor"])
+      _user = insert(:user, ap_id: hd(data["to"]))
+
+      assert {:ok, _activity} = Transmogrifier.handle_incoming(data)
+    end
+
+    test "it rejects messages that don't contain content" do
+      data =
+        File.read!("test/fixtures/create-chat-message.json")
+        |> Poison.decode!()
+
+      object =
+        data["object"]
+        |> Map.delete("content")
+
+      data =
+        data
+        |> Map.put("object", object)
+
+      _author =
+        insert(:user, ap_id: data["actor"], local: false, last_refreshed_at: DateTime.utc_now())
+
+      _recipient =
+        insert(:user,
+          ap_id: List.first(data["to"]),
+          local: true,
+          last_refreshed_at: DateTime.utc_now()
+        )
+
+      {:error, _} = Transmogrifier.handle_incoming(data)
+    end
+
+    test "it rejects messages that don't concern local users" do
+      data =
+        File.read!("test/fixtures/create-chat-message.json")
+        |> Poison.decode!()
+
+      _author =
+        insert(:user, ap_id: data["actor"], local: false, last_refreshed_at: DateTime.utc_now())
+
+      _recipient =
+        insert(:user,
+          ap_id: List.first(data["to"]),
+          local: false,
+          last_refreshed_at: DateTime.utc_now()
+        )
+
+      {:error, _} = Transmogrifier.handle_incoming(data)
+    end
+
+    test "it rejects messages where the `to` field of activity and object don't match" do
+      data =
+        File.read!("test/fixtures/create-chat-message.json")
+        |> Poison.decode!()
+
+      author = insert(:user, ap_id: data["actor"])
+      _recipient = insert(:user, ap_id: List.first(data["to"]))
+
+      data =
+        data
+        |> Map.put("to", author.ap_id)
+
+      assert match?({:error, _}, Transmogrifier.handle_incoming(data))
+      refute Object.get_by_ap_id(data["object"]["id"])
+    end
+
+    test "it fetches the actor if they aren't in our system" do
+      Tesla.Mock.mock(fn env -> apply(HttpRequestMock, :request, [env]) end)
+
+      data =
+        File.read!("test/fixtures/create-chat-message.json")
+        |> Poison.decode!()
+        |> Map.put("actor", "http://mastodon.example.org/users/admin")
+        |> put_in(["object", "actor"], "http://mastodon.example.org/users/admin")
+
+      _recipient = insert(:user, ap_id: List.first(data["to"]), local: true)
+
+      {:ok, %Activity{} = _activity} = Transmogrifier.handle_incoming(data)
+    end
+
+    test "it inserts it and creates a chat" do
+      data =
+        File.read!("test/fixtures/create-chat-message.json")
+        |> Poison.decode!()
+
+      author =
+        insert(:user, ap_id: data["actor"], local: false, last_refreshed_at: DateTime.utc_now())
+
+      recipient = insert(:user, ap_id: List.first(data["to"]), local: true)
+
+      {:ok, %Activity{} = activity} = Transmogrifier.handle_incoming(data)
+      assert activity.local == false
+
+      assert activity.actor == author.ap_id
+      assert activity.recipients == [recipient.ap_id, author.ap_id]
+
+      %Object{} = object = Object.get_by_ap_id(activity.data["object"])
+
+      assert object
+      assert object.data["content"] == "You expected a cute girl? Too bad. alert(&#39;XSS&#39;)"
+      assert match?(%{"firefox" => _}, object.data["emoji"])
+
+      refute Chat.get(author.id, recipient.ap_id)
+      assert Chat.get(recipient.id, author.ap_id)
+    end
+  end
+end
--- a/test/web/activity_pub/transmogrifier/follow_handling_test.exs
+++ b/test/web/activity_pub/transmogrifier/follow_handling_test.exs
@ -5,6 +5,7 @@
 defmodule Pleroma.Web.ActivityPub.Transmogrifier.FollowHandlingTest do
  use Pleroma.DataCase
  alias Pleroma.Activity
+  alias Pleroma.Notification
  alias Pleroma.Repo
  alias Pleroma.User
  alias Pleroma.Web.ActivityPub.Transmogrifier
@ -12,6 +13,7 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier.FollowHandlingTest do

  import Pleroma.Factory
  import Ecto.Query
+  import Mock

  setup_all do
    Tesla.Mock.mock_global(fn env -> apply(HttpRequestMock, :request, [env]) end)
@ -57,9 +59,12 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier.FollowHandlingTest do
      activity = Repo.get(Activity, activity.id)
      assert activity.data["state"] == "accept"
      assert User.following?(User.get_cached_by_ap_id(data["actor"]), user)
+
+      [notification] = Notification.for_user(user)
+      assert notification.type == "follow"
    end

-    test "with locked accounts, it does not create a follow or an accept" do
+    test "with locked accounts, it does create a Follow, but not an Accept" do
      user = insert(:user, locked: true)

      data =
@ -81,6 +86,9 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier.FollowHandlingTest do
        |> Repo.all()

      assert Enum.empty?(accepts)
+
+      [notification] = Notification.for_user(user)
+      assert notification.type == "follow_request"
    end

    test "it works for follow requests when you are already followed, creating a new accept activity" do
@ -144,6 +152,23 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier.FollowHandlingTest do
      assert activity.data["state"] == "reject"
    end

+    test "it rejects incoming follow requests if the following errors for some reason" do
+      user = insert(:user)
+
+      data =
+        File.read!("test/fixtures/mastodon-follow-activity.json")
+        |> Poison.decode!()
+        |> Map.put("object", user.ap_id)
+
+      with_mock Pleroma.User, [:passthrough], follow: fn _, _ -> {:error, :testing} end do
+        {:ok, %Activity{data: %{"id" => id}}} = Transmogrifier.handle_incoming(data)
+
+        %Activity{} = activity = Activity.get_by_ap_id(id)
+
+        assert activity.data["state"] == "reject"
+      end
+    end
+
    test "it works for incoming follow requests from hubzilla" do
      user = insert(:user)

--- a/test/web/common_api/common_api_test.exs
+++ b/test/web/common_api/common_api_test.exs
@ -5,7 +5,9 @@
 defmodule Pleroma.Web.CommonAPITest do
  use Pleroma.DataCase
  alias Pleroma.Activity
+  alias Pleroma.Chat
  alias Pleroma.Conversation.Participation
+  alias Pleroma.Notification
  alias Pleroma.Object
  alias Pleroma.User
  alias Pleroma.Web.ActivityPub.ActivityPub
@ -23,6 +25,150 @@ defmodule Pleroma.Web.CommonAPITest do
  setup do: clear_config([:instance, :limit])
  setup do: clear_config([:instance, :max_pinned_statuses])

+  describe "posting chat messages" do
+    setup do: clear_config([:instance, :chat_limit])
+
+    test "it posts a chat message without content but with an attachment" do
+      author = insert(:user)
+      recipient = insert(:user)
+
+      file = %Plug.Upload{
+        content_type: "image/jpg",
+        path: Path.absname("test/fixtures/image.jpg"),
+        filename: "an_image.jpg"
+      }
+
+      {:ok, upload} = ActivityPub.upload(file, actor: author.ap_id)
+
+      with_mocks([
+        {
+          Pleroma.Web.Streamer,
+          [],
+          [
+            stream: fn _, _ ->
+              nil
+            end
+          ]
+        },
+        {
+          Pleroma.Web.Push,
+          [],
+          [
+            send: fn _ -> nil end
+          ]
+        }
+      ]) do
+        {:ok, activity} =
+          CommonAPI.post_chat_message(
+            author,
+            recipient,
+            nil,
+            media_id: upload.id
+          )
+
+        notification =
+          Notification.for_user_and_activity(recipient, activity)
+          |> Repo.preload(:activity)
+
+        assert called(Pleroma.Web.Push.send(notification))
+        assert called(Pleroma.Web.Streamer.stream(["user", "user:notification"], notification))
+        assert called(Pleroma.Web.Streamer.stream(["user", "user:pleroma_chat"], :_))
+
+        assert activity
+      end
+    end
+
+    test "it adds html newlines" do
+      author = insert(:user)
+      recipient = insert(:user)
+
+      other_user = insert(:user)
+
+      {:ok, activity} =
+        CommonAPI.post_chat_message(
+          author,
+          recipient,
+          "uguu\nuguuu"
+        )
+
+      assert other_user.ap_id not in activity.recipients
+
+      object = Object.normalize(activity, false)
+
+      assert object.data["content"] == "uguu<br/>uguuu"
+    end
+
+    test "it linkifies" do
+      author = insert(:user)
+      recipient = insert(:user)
+
+      other_user = insert(:user)
+
+      {:ok, activity} =
+        CommonAPI.post_chat_message(
+          author,
+          recipient,
+          "https://example.org is the site of @#{other_user.nickname} #2hu"
+        )
+
+      assert other_user.ap_id not in activity.recipients
+
+      object = Object.normalize(activity, false)
+
+      assert object.data["content"] ==
+               "<a href=\"https://example.org\" rel=\"ugc\">https://example.org</a> is the site of <span class=\"h-card\"><a class=\"u-url mention\" data-user=\"#{
+                 other_user.id
+               }\" href=\"#{other_user.ap_id}\" rel=\"ugc\">@<span>#{other_user.nickname}</span></a></span> <a class=\"hashtag\" data-tag=\"2hu\" href=\"http://localhost:4001/tag/2hu\">#2hu</a>"
+    end
+
+    test "it posts a chat message" do
+      author = insert(:user)
+      recipient = insert(:user)
+
+      {:ok, activity} =
+        CommonAPI.post_chat_message(
+          author,
+          recipient,
+          "a test message <script>alert('uuu')</script> :firefox:"
+        )
+
+      assert activity.data["type"] == "Create"
+      assert activity.local
+      object = Object.normalize(activity)
+
+      assert object.data["type"] == "ChatMessage"
+      assert object.data["to"] == [recipient.ap_id]
+
+      assert object.data["content"] ==
+               "a test message &lt;script&gt;alert(&#39;uuu&#39;)&lt;/script&gt; :firefox:"
+
+      assert object.data["emoji"] == %{
+               "firefox" => "http://localhost:4001/emoji/Firefox.gif"
+             }
+
+      assert Chat.get(author.id, recipient.ap_id)
+      assert Chat.get(recipient.id, author.ap_id)
+
+      assert :ok == Pleroma.Web.Federator.perform(:publish, activity)
+    end
+
+    test "it reject messages over the local limit" do
+      Pleroma.Config.put([:instance, :chat_limit], 2)
+
+      author = insert(:user)
+      recipient = insert(:user)
+
+      {:error, message} =
+        CommonAPI.post_chat_message(
+          author,
+          recipient,
+          "123"
+        )
+
+      assert message == :content_too_long
+    end
+  end
+
  describe "unblocking" do
    test "it works even without an existing block activity" do
      blocked = insert(:user)
--- a/test/web/mastodon_api/controllers/notification_controller_test.exs
+++ b/test/web/mastodon_api/controllers/notification_controller_test.exs
@ -54,6 +54,27 @@ defmodule Pleroma.Web.MastodonAPI.NotificationControllerTest do
    assert response == expected_response
  end

+  test "by default, does not contain pleroma:chat_mention" do
+    %{user: user, conn: conn} = oauth_access(["read:notifications"])
+    other_user = insert(:user)
+
+    {:ok, _activity} = CommonAPI.post_chat_message(other_user, user, "hey")
+
+    result =
+      conn
+      |> get("/api/v1/notifications")
+      |> json_response_and_validate_schema(200)
+
+    assert [] == result
+
+    result =
+      conn
+      |> get("/api/v1/notifications?include_types[]=pleroma:chat_mention")
+      |> json_response_and_validate_schema(200)
+
+    assert [_] = result
+  end
+
  test "getting a single notification" do
    %{user: user, conn: conn} = oauth_access(["read:notifications"])
    other_user = insert(:user)
--- a/test/web/mastodon_api/controllers/subscription_controller_test.exs
+++ b/test/web/mastodon_api/controllers/subscription_controller_test.exs
@ -58,7 +58,9 @@ defmodule Pleroma.Web.MastodonAPI.SubscriptionControllerTest do
      result =
        conn
        |> post("/api/v1/push/subscription", %{
-          "data" => %{"alerts" => %{"mention" => true, "test" => true}},
+          "data" => %{
+            "alerts" => %{"mention" => true, "test" => true, "pleroma:chat_mention" => true}
+          },
          "subscription" => @sub
        })
        |> json_response_and_validate_schema(200)
@ -66,7 +68,7 @@ defmodule Pleroma.Web.MastodonAPI.SubscriptionControllerTest do
      [subscription] = Pleroma.Repo.all(Subscription)

      assert %{
-               "alerts" => %{"mention" => true},
+               "alerts" => %{"mention" => true, "pleroma:chat_mention" => true},
               "endpoint" => subscription.endpoint,
               "id" => to_string(subscription.id),
               "server_key" => @server_key
--- a/test/web/mastodon_api/views/account_view_test.exs
+++ b/test/web/mastodon_api/views/account_view_test.exs
@ -72,6 +72,7 @@ defmodule Pleroma.Web.MastodonAPI.AccountViewTest do
        fields: []
      },
      pleroma: %{
+        ap_id: user.ap_id,
        background_image: "https://example.com/images/asuka_hospital.png",
        confirmation_pending: false,
        tags: [],
@ -148,6 +149,7 @@ defmodule Pleroma.Web.MastodonAPI.AccountViewTest do
        fields: []
      },
      pleroma: %{
+        ap_id: user.ap_id,
        background_image: nil,
        confirmation_pending: false,
        tags: [],
--- a/test/web/mastodon_api/views/notification_view_test.exs
+++ b/test/web/mastodon_api/views/notification_view_test.exs
@ -6,7 +6,10 @@ defmodule Pleroma.Web.MastodonAPI.NotificationViewTest do
  use Pleroma.DataCase

  alias Pleroma.Activity
+  alias Pleroma.Chat
+  alias Pleroma.Chat.MessageReference
  alias Pleroma.Notification
+  alias Pleroma.Object
  alias Pleroma.Repo
  alias Pleroma.User
  alias Pleroma.Web.CommonAPI
@ -14,6 +17,7 @@ defmodule Pleroma.Web.MastodonAPI.NotificationViewTest do
  alias Pleroma.Web.MastodonAPI.AccountView
  alias Pleroma.Web.MastodonAPI.NotificationView
  alias Pleroma.Web.MastodonAPI.StatusView
+  alias Pleroma.Web.PleromaAPI.Chat.MessageReferenceView
  import Pleroma.Factory

  defp test_notifications_rendering(notifications, user, expected_result) do
@ -31,6 +35,30 @@ defmodule Pleroma.Web.MastodonAPI.NotificationViewTest do
    assert expected_result == result
  end

+  test "ChatMessage notification" do
+    user = insert(:user)
+    recipient = insert(:user)
+    {:ok, activity} = CommonAPI.post_chat_message(user, recipient, "what's up my dude")
+
+    {:ok, [notification]} = Notification.create_notifications(activity)
+
+    object = Object.normalize(activity)
+    chat = Chat.get(recipient.id, user.ap_id)
+
+    cm_ref = MessageReference.for_chat_and_object(chat, object)
+
+    expected = %{
+      id: to_string(notification.id),
+      pleroma: %{is_seen: false},
+      type: "pleroma:chat_mention",
+      account: AccountView.render("show.json", %{user: user, for: recipient}),
+      chat_message: MessageReferenceView.render("show.json", %{chat_message_reference: cm_ref}),
+      created_at: Utils.to_masto_date(notification.inserted_at)
+    }
+
+    test_notifications_rendering([notification], recipient, [expected])
+  end
+
  test "Mention notification" do
    user = insert(:user)
    mentioned_user = insert(:user)
--- a/test/web/node_info_test.exs
+++ b/test/web/node_info_test.exs
@ -145,7 +145,8 @@ defmodule Pleroma.Web.NodeInfoTest do
      "shareable_emoji_packs",
      "multifetch",
      "pleroma_emoji_reactions",
-      "pleroma:api/v1/notifications:include_types_filter"
+      "pleroma:api/v1/notifications:include_types_filter",
+      "pleroma_chat_messages"
    ]

    assert MapSet.subset?(
--- a/test/web/pleroma_api/controllers/chat_controller_test.exs
+++ b/test/web/pleroma_api/controllers/chat_controller_test.exs
@ -0,0 +1,336 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+defmodule Pleroma.Web.PleromaAPI.ChatControllerTest do
+  use Pleroma.Web.ConnCase, async: true
+
+  alias Pleroma.Chat
+  alias Pleroma.Chat.MessageReference
+  alias Pleroma.Object
+  alias Pleroma.User
+  alias Pleroma.Web.ActivityPub.ActivityPub
+  alias Pleroma.Web.CommonAPI
+
+  import Pleroma.Factory
+
+  describe "POST /api/v1/pleroma/chats/:id/messages/:message_id/read" do
+    setup do: oauth_access(["write:chats"])
+
+    test "it marks one message as read", %{conn: conn, user: user} do
+      other_user = insert(:user)
+
+      {:ok, create} = CommonAPI.post_chat_message(other_user, user, "sup")
+      {:ok, _create} = CommonAPI.post_chat_message(other_user, user, "sup part 2")
+      {:ok, chat} = Chat.get_or_create(user.id, other_user.ap_id)
+      object = Object.normalize(create, false)
+      cm_ref = MessageReference.for_chat_and_object(chat, object)
+
+      assert cm_ref.unread == true
+
+      result =
+        conn
+        |> post("/api/v1/pleroma/chats/#{chat.id}/messages/#{cm_ref.id}/read")
+        |> json_response_and_validate_schema(200)
+
+      assert result["unread"] == false
+
+      cm_ref = MessageReference.for_chat_and_object(chat, object)
+
+      assert cm_ref.unread == false
+    end
+  end
+
+  describe "POST /api/v1/pleroma/chats/:id/read" do
+    setup do: oauth_access(["write:chats"])
+
+    test "given a `last_read_id`, it marks everything until then as read", %{
+      conn: conn,
+      user: user
+    } do
+      other_user = insert(:user)
+
+      {:ok, create} = CommonAPI.post_chat_message(other_user, user, "sup")
+      {:ok, _create} = CommonAPI.post_chat_message(other_user, user, "sup part 2")
+      {:ok, chat} = Chat.get_or_create(user.id, other_user.ap_id)
+      object = Object.normalize(create, false)
+      cm_ref = MessageReference.for_chat_and_object(chat, object)
+
+      assert cm_ref.unread == true
+
+      result =
+        conn
+        |> put_req_header("content-type", "application/json")
+        |> post("/api/v1/pleroma/chats/#{chat.id}/read", %{"last_read_id" => cm_ref.id})
+        |> json_response_and_validate_schema(200)
+
+      assert result["unread"] == 1
+
+      cm_ref = MessageReference.for_chat_and_object(chat, object)
+
+      assert cm_ref.unread == false
+    end
+  end
+
+  describe "POST /api/v1/pleroma/chats/:id/messages" do
+    setup do: oauth_access(["write:chats"])
+
+    test "it posts a message to the chat", %{conn: conn, user: user} do
+      other_user = insert(:user)
+
+      {:ok, chat} = Chat.get_or_create(user.id, other_user.ap_id)
+
+      result =
+        conn
+        |> put_req_header("content-type", "application/json")
+        |> post("/api/v1/pleroma/chats/#{chat.id}/messages", %{"content" => "Hallo!!"})
+        |> json_response_and_validate_schema(200)
+
+      assert result["content"] == "Hallo!!"
+      assert result["chat_id"] == chat.id |> to_string()
+    end
+
+    test "it fails if there is no content", %{conn: conn, user: user} do
+      other_user = insert(:user)
+
+      {:ok, chat} = Chat.get_or_create(user.id, other_user.ap_id)
+
+      result =
+        conn
+        |> put_req_header("content-type", "application/json")
+        |> post("/api/v1/pleroma/chats/#{chat.id}/messages")
+        |> json_response_and_validate_schema(400)
+
+      assert result
+    end
+
+    test "it works with an attachment", %{conn: conn, user: user} do
+      file = %Plug.Upload{
+        content_type: "image/jpg",
+        path: Path.absname("test/fixtures/image.jpg"),
+        filename: "an_image.jpg"
+      }
+
+      {:ok, upload} = ActivityPub.upload(file, actor: user.ap_id)
+
+      other_user = insert(:user)
+
+      {:ok, chat} = Chat.get_or_create(user.id, other_user.ap_id)
+
+      result =
+        conn
+        |> put_req_header("content-type", "application/json")
+        |> post("/api/v1/pleroma/chats/#{chat.id}/messages", %{
+          "media_id" => to_string(upload.id)
+        })
+        |> json_response_and_validate_schema(200)
+
+      assert result["attachment"]
+    end
+  end
+
+  describe "DELETE /api/v1/pleroma/chats/:id/messages/:message_id" do
+    setup do: oauth_access(["write:chats"])
+
+    test "it deletes a message from the chat", %{conn: conn, user: user} do
+      recipient = insert(:user)
+
+      {:ok, message} =
+        CommonAPI.post_chat_message(user, recipient, "Hello darkness my old friend")
+
+      {:ok, other_message} = CommonAPI.post_chat_message(recipient, user, "nico nico ni")
+
+      object = Object.normalize(message, false)
+
+      chat = Chat.get(user.id, recipient.ap_id)
+
+      cm_ref = MessageReference.for_chat_and_object(chat, object)
+
+      # Deleting your own message removes the message and the reference
+      result =
+        conn
+        |> put_req_header("content-type", "application/json")
+        |> delete("/api/v1/pleroma/chats/#{chat.id}/messages/#{cm_ref.id}")
+        |> json_response_and_validate_schema(200)
+
+      assert result["id"] == cm_ref.id
+      refute MessageReference.get_by_id(cm_ref.id)
+      assert %{data: %{"type" => "Tombstone"}} = Object.get_by_id(object.id)
+
+      # Deleting other people's messages just removes the reference
+      object = Object.normalize(other_message, false)
+      cm_ref = MessageReference.for_chat_and_object(chat, object)
+
+      result =
+        conn
+        |> put_req_header("content-type", "application/json")
+        |> delete("/api/v1/pleroma/chats/#{chat.id}/messages/#{cm_ref.id}")
+        |> json_response_and_validate_schema(200)
+
+      assert result["id"] == cm_ref.id
+      refute MessageReference.get_by_id(cm_ref.id)
+      assert Object.get_by_id(object.id)
+    end
+  end
+
+  describe "GET /api/v1/pleroma/chats/:id/messages" do
+    setup do: oauth_access(["read:chats"])
+
+    test "it paginates", %{conn: conn, user: user} do
+      recipient = insert(:user)
+
+      Enum.each(1..30, fn _ ->
+        {:ok, _} = CommonAPI.post_chat_message(user, recipient, "hey")
+      end)
+
+      chat = Chat.get(user.id, recipient.ap_id)
+
+      result =
+        conn
+        |> get("/api/v1/pleroma/chats/#{chat.id}/messages")
+        |> json_response_and_validate_schema(200)
+
+      assert length(result) == 20
+
+      result =
+        conn
+        |> get("/api/v1/pleroma/chats/#{chat.id}/messages?max_id=#{List.last(result)["id"]}")
+        |> json_response_and_validate_schema(200)
+
+      assert length(result) == 10
+    end
+
+    test "it returns the messages for a given chat", %{conn: conn, user: user} do
+      other_user = insert(:user)
+      third_user = insert(:user)
+
+      {:ok, _} = CommonAPI.post_chat_message(user, other_user, "hey")
+      {:ok, _} = CommonAPI.post_chat_message(user, third_user, "hey")
+      {:ok, _} = CommonAPI.post_chat_message(user, other_user, "how are you?")
+      {:ok, _} = CommonAPI.post_chat_message(other_user, user, "fine, how about you?")
+
+      chat = Chat.get(user.id, other_user.ap_id)
+
+      result =
+        conn
+        |> get("/api/v1/pleroma/chats/#{chat.id}/messages")
+        |> json_response_and_validate_schema(200)
+
+      result
+      |> Enum.each(fn message ->
+        assert message["chat_id"] == chat.id |> to_string()
+      end)
+
+      assert length(result) == 3
+
+      # Trying to get the chat of a different user
+      result =
+        conn
+        |> assign(:user, other_user)
+        |> get("/api/v1/pleroma/chats/#{chat.id}/messages")
+
+      assert result |> json_response(404)
+    end
+  end
+
+  describe "POST /api/v1/pleroma/chats/by-account-id/:id" do
+    setup do: oauth_access(["write:chats"])
+
+    test "it creates or returns a chat", %{conn: conn} do
+      other_user = insert(:user)
+
+      result =
+        conn
+        |> post("/api/v1/pleroma/chats/by-account-id/#{other_user.id}")
+        |> json_response_and_validate_schema(200)
+
+      assert result["id"]
+    end
+  end
+
+  describe "GET /api/v1/pleroma/chats/:id" do
+    setup do: oauth_access(["read:chats"])
+
+    test "it returns a chat", %{conn: conn, user: user} do
+      other_user = insert(:user)
+
+      {:ok, chat} = Chat.get_or_create(user.id, other_user.ap_id)
+
+      result =
+        conn
+        |> get("/api/v1/pleroma/chats/#{chat.id}")
+        |> json_response_and_validate_schema(200)
+
+      assert result["id"] == to_string(chat.id)
+    end
+  end
+
+  describe "GET /api/v1/pleroma/chats" do
+    setup do: oauth_access(["read:chats"])
+
+    test "it does not return chats with users you blocked", %{conn: conn, user: user} do
+      recipient = insert(:user)
+
+      {:ok, _} = Chat.get_or_create(user.id, recipient.ap_id)
+
+      result =
+        conn
+        |> get("/api/v1/pleroma/chats")
+        |> json_response_and_validate_schema(200)
+
+      assert length(result) == 1
+
+      User.block(user, recipient)
+
+      result =
+        conn
+        |> get("/api/v1/pleroma/chats")
+        |> json_response_and_validate_schema(200)
+
+      assert length(result) == 0
+    end
+
+    test "it returns all chats", %{conn: conn, user: user} do
+      Enum.each(1..30, fn _ ->
+        recipient = insert(:user)
+        {:ok, _} = Chat.get_or_create(user.id, recipient.ap_id)
+      end)
+
+      result =
+        conn
+        |> get("/api/v1/pleroma/chats")
+        |> json_response_and_validate_schema(200)
+
+      assert length(result) == 30
+    end
+
+    test "it return a list of chats the current user is participating in, in descending order of updates",
+         %{conn: conn, user: user} do
+      har = insert(:user)
+      jafnhar = insert(:user)
+      tridi = insert(:user)
+
+      {:ok, chat_1} = Chat.get_or_create(user.id, har.ap_id)
+      :timer.sleep(1000)
+      {:ok, _chat_2} = Chat.get_or_create(user.id, jafnhar.ap_id)
+      :timer.sleep(1000)
+      {:ok, chat_3} = Chat.get_or_create(user.id, tridi.ap_id)
+      :timer.sleep(1000)
+
+      # bump the second one
+      {:ok, chat_2} = Chat.bump_or_create(user.id, jafnhar.ap_id)
+
+      result =
+        conn
+        |> get("/api/v1/pleroma/chats")
+        |> json_response_and_validate_schema(200)
+
+      ids = Enum.map(result, & &1["id"])
+
+      assert ids == [
+               chat_2.id |> to_string(),
+               chat_3.id |> to_string(),
+               chat_1.id |> to_string()
+             ]
+    end
+  end
+end
--- a/test/web/pleroma_api/views/chat/message_reference_view_test.exs
+++ b/test/web/pleroma_api/views/chat/message_reference_view_test.exs
@ -0,0 +1,61 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.PleromaAPI.Chat.MessageReferenceViewTest do
+  use Pleroma.DataCase
+
+  alias Pleroma.Chat
+  alias Pleroma.Chat.MessageReference
+  alias Pleroma.Object
+  alias Pleroma.Web.ActivityPub.ActivityPub
+  alias Pleroma.Web.CommonAPI
+  alias Pleroma.Web.PleromaAPI.Chat.MessageReferenceView
+
+  import Pleroma.Factory
+
+  test "it displays a chat message" do
+    user = insert(:user)
+    recipient = insert(:user)
+
+    file = %Plug.Upload{
+      content_type: "image/jpg",
+      path: Path.absname("test/fixtures/image.jpg"),
+      filename: "an_image.jpg"
+    }
+
+    {:ok, upload} = ActivityPub.upload(file, actor: user.ap_id)
+    {:ok, activity} = CommonAPI.post_chat_message(user, recipient, "kippis :firefox:")
+
+    chat = Chat.get(user.id, recipient.ap_id)
+
+    object = Object.normalize(activity)
+
+    cm_ref = MessageReference.for_chat_and_object(chat, object)
+
+    chat_message = MessageReferenceView.render("show.json", chat_message_reference: cm_ref)
+
+    assert chat_message[:id] == cm_ref.id
+    assert chat_message[:content] == "kippis :firefox:"
+    assert chat_message[:account_id] == user.id
+    assert chat_message[:chat_id]
+    assert chat_message[:created_at]
+    assert chat_message[:unread] == false
+    assert match?([%{shortcode: "firefox"}], chat_message[:emojis])
+
+    {:ok, activity} = CommonAPI.post_chat_message(recipient, user, "gkgkgk", media_id: upload.id)
+
+    object = Object.normalize(activity)
+
+    cm_ref = MessageReference.for_chat_and_object(chat, object)
+
+    chat_message_two = MessageReferenceView.render("show.json", chat_message_reference: cm_ref)
+
+    assert chat_message_two[:id] == cm_ref.id
+    assert chat_message_two[:content] == "gkgkgk"
+    assert chat_message_two[:account_id] == recipient.id
+    assert chat_message_two[:chat_id] == chat_message[:chat_id]
+    assert chat_message_two[:attachment]
+    assert chat_message_two[:unread] == true
+  end
+end
--- a/test/web/pleroma_api/views/chat_view_test.exs
+++ b/test/web/pleroma_api/views/chat_view_test.exs
@ -0,0 +1,48 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.PleromaAPI.ChatViewTest do
+  use Pleroma.DataCase
+
+  alias Pleroma.Chat
+  alias Pleroma.Chat.MessageReference
+  alias Pleroma.Object
+  alias Pleroma.Web.CommonAPI
+  alias Pleroma.Web.CommonAPI.Utils
+  alias Pleroma.Web.MastodonAPI.AccountView
+  alias Pleroma.Web.PleromaAPI.Chat.MessageReferenceView
+  alias Pleroma.Web.PleromaAPI.ChatView
+
+  import Pleroma.Factory
+
+  test "it represents a chat" do
+    user = insert(:user)
+    recipient = insert(:user)
+
+    {:ok, chat} = Chat.get_or_create(user.id, recipient.ap_id)
+
+    represented_chat = ChatView.render("show.json", chat: chat)
+
+    assert represented_chat == %{
+             id: "#{chat.id}",
+             account: AccountView.render("show.json", user: recipient),
+             unread: 0,
+             last_message: nil,
+             updated_at: Utils.to_masto_date(chat.updated_at)
+           }
+
+    {:ok, chat_message_creation} = CommonAPI.post_chat_message(user, recipient, "hello")
+
+    chat_message = Object.normalize(chat_message_creation, false)
+
+    {:ok, chat} = Chat.get_or_create(user.id, recipient.ap_id)
+
+    represented_chat = ChatView.render("show.json", chat: chat)
+
+    cm_ref = MessageReference.for_chat_and_object(chat, chat_message)
+
+    assert represented_chat[:last_message] ==
+             MessageReferenceView.render("show.json", chat_message_reference: cm_ref)
+  end
+end
--- a/test/web/push/impl_test.exs
+++ b/test/web/push/impl_test.exs
@ -5,8 +5,10 @@
 defmodule Pleroma.Web.Push.ImplTest do
  use Pleroma.DataCase

+  alias Pleroma.Notification
  alias Pleroma.Object
  alias Pleroma.User
+  alias Pleroma.Web.ActivityPub.ActivityPub
  alias Pleroma.Web.CommonAPI
  alias Pleroma.Web.Push.Impl
  alias Pleroma.Web.Push.Subscription
@ -60,7 +62,8 @@ defmodule Pleroma.Web.Push.ImplTest do
    notif =
      insert(:notification,
        user: user,
-        activity: activity
+        activity: activity,
+        type: "mention"
      )

    assert Impl.perform(notif) == {:ok, [:ok, :ok]}
@ -126,7 +129,7 @@ defmodule Pleroma.Web.Push.ImplTest do
           ) ==
             "@Bob: Lorem ipsum dolor sit amet, consectetur  adipiscing elit. Fusce sagittis fini..."

-    assert Impl.format_title(%{activity: activity}) ==
+    assert Impl.format_title(%{activity: activity, type: "mention"}) ==
             "New Mention"
  end

@ -136,9 +139,10 @@ defmodule Pleroma.Web.Push.ImplTest do
    {:ok, _, _, activity} = CommonAPI.follow(user, other_user)
    object = Object.normalize(activity, false)

-    assert Impl.format_body(%{activity: activity}, user, object) == "@Bob has followed you"
+    assert Impl.format_body(%{activity: activity, type: "follow"}, user, object) ==
+             "@Bob has followed you"

-    assert Impl.format_title(%{activity: activity}) ==
+    assert Impl.format_title(%{activity: activity, type: "follow"}) ==
             "New Follower"
  end

@ -157,7 +161,7 @@ defmodule Pleroma.Web.Push.ImplTest do
    assert Impl.format_body(%{activity: announce_activity}, user, object) ==
             "@#{user.nickname} repeated: Lorem ipsum dolor sit amet, consectetur  adipiscing elit. Fusce sagittis fini..."

-    assert Impl.format_title(%{activity: announce_activity}) ==
+    assert Impl.format_title(%{activity: announce_activity, type: "reblog"}) ==
             "New Repeat"
  end

@ -173,9 +177,10 @@ defmodule Pleroma.Web.Push.ImplTest do
    {:ok, activity} = CommonAPI.favorite(user, activity.id)
    object = Object.normalize(activity)

-    assert Impl.format_body(%{activity: activity}, user, object) == "@Bob has favorited your post"
+    assert Impl.format_body(%{activity: activity, type: "favourite"}, user, object) ==
+             "@Bob has favorited your post"

-    assert Impl.format_title(%{activity: activity}) ==
+    assert Impl.format_title(%{activity: activity, type: "favourite"}) ==
             "New Favorite"
  end

@ -193,6 +198,46 @@ defmodule Pleroma.Web.Push.ImplTest do
  end

  describe "build_content/3" do
+    test "builds content for chat messages" do
+      user = insert(:user)
+      recipient = insert(:user)
+
+      {:ok, chat} = CommonAPI.post_chat_message(user, recipient, "hey")
+      object = Object.normalize(chat, false)
+      [notification] = Notification.for_user(recipient)
+
+      res = Impl.build_content(notification, user, object)
+
+      assert res == %{
+               body: "@#{user.nickname}: hey",
+               title: "New Chat Message"
+             }
+    end
+
+    test "builds content for chat messages with no content" do
+      user = insert(:user)
+      recipient = insert(:user)
+
+      file = %Plug.Upload{
+        content_type: "image/jpg",
+        path: Path.absname("test/fixtures/image.jpg"),
+        filename: "an_image.jpg"
+      }
+
+      {:ok, upload} = ActivityPub.upload(file, actor: user.ap_id)
+
+      {:ok, chat} = CommonAPI.post_chat_message(user, recipient, nil, media_id: upload.id)
+      object = Object.normalize(chat, false)
+      [notification] = Notification.for_user(recipient)
+
+      res = Impl.build_content(notification, user, object)
+
+      assert res == %{
+               body: "@#{user.nickname}: (Attachment)",
+               title: "New Chat Message"
+             }
+    end
+
    test "hides details for notifications when privacy option enabled" do
      user = insert(:user, nickname: "Bob")
      user2 = insert(:user, nickname: "Rob", notification_settings: %{privacy_option: true})
@ -218,7 +263,7 @@ defmodule Pleroma.Web.Push.ImplTest do
          status: "<Lorem ipsum dolor sit amet."
        })

-      notif = insert(:notification, user: user2, activity: activity)
+      notif = insert(:notification, user: user2, activity: activity, type: "mention")

      actor = User.get_cached_by_ap_id(notif.activity.data["actor"])
      object = Object.normalize(activity)
@ -229,7 +274,7 @@ defmodule Pleroma.Web.Push.ImplTest do

      {:ok, activity} = CommonAPI.favorite(user, activity.id)

-      notif = insert(:notification, user: user2, activity: activity)
+      notif = insert(:notification, user: user2, activity: activity, type: "favourite")

      actor = User.get_cached_by_ap_id(notif.activity.data["actor"])
      object = Object.normalize(activity)
@ -268,7 +313,7 @@ defmodule Pleroma.Web.Push.ImplTest do
            "<span>Lorem ipsum dolor sit amet</span>, consectetur :firefox: adipiscing elit. Fusce sagittis finibus turpis."
        })

-      notif = insert(:notification, user: user2, activity: activity)
+      notif = insert(:notification, user: user2, activity: activity, type: "mention")

      actor = User.get_cached_by_ap_id(notif.activity.data["actor"])
      object = Object.normalize(activity)
@ -281,7 +326,7 @@ defmodule Pleroma.Web.Push.ImplTest do

      {:ok, activity} = CommonAPI.favorite(user, activity.id)

-      notif = insert(:notification, user: user2, activity: activity)
+      notif = insert(:notification, user: user2, activity: activity, type: "favourite")

      actor = User.get_cached_by_ap_id(notif.activity.data["actor"])
      object = Object.normalize(activity)
--- a/test/web/streamer/streamer_test.exs
+++ b/test/web/streamer/streamer_test.exs
@ -7,11 +7,15 @@ defmodule Pleroma.Web.StreamerTest do

  import Pleroma.Factory

+  alias Pleroma.Chat
+  alias Pleroma.Chat.MessageReference
  alias Pleroma.Conversation.Participation
  alias Pleroma.List
+  alias Pleroma.Object
  alias Pleroma.User
  alias Pleroma.Web.CommonAPI
  alias Pleroma.Web.Streamer
+  alias Pleroma.Web.StreamerView

  @moduletag needs_streamer: true, capture_log: true

@ -145,6 +149,57 @@ defmodule Pleroma.Web.StreamerTest do
      refute Streamer.filtered_by_user?(user, notify)
    end

+    test "it sends chat messages to the 'user:pleroma_chat' stream", %{user: user} do
+      other_user = insert(:user)
+
+      {:ok, create_activity} = CommonAPI.post_chat_message(other_user, user, "hey cirno")
+      object = Object.normalize(create_activity, false)
+      chat = Chat.get(user.id, other_user.ap_id)
+      cm_ref = MessageReference.for_chat_and_object(chat, object)
+      cm_ref = %{cm_ref | chat: chat, object: object}
+
+      Streamer.get_topic_and_add_socket("user:pleroma_chat", user)
+      Streamer.stream("user:pleroma_chat", {user, cm_ref})
+
+      text = StreamerView.render("chat_update.json", %{chat_message_reference: cm_ref})
+
+      assert text =~ "hey cirno"
+      assert_receive {:text, ^text}
+    end
+
+    test "it sends chat messages to the 'user' stream", %{user: user} do
+      other_user = insert(:user)
+
+      {:ok, create_activity} = CommonAPI.post_chat_message(other_user, user, "hey cirno")
+      object = Object.normalize(create_activity, false)
+      chat = Chat.get(user.id, other_user.ap_id)
+      cm_ref = MessageReference.for_chat_and_object(chat, object)
+      cm_ref = %{cm_ref | chat: chat, object: object}
+
+      Streamer.get_topic_and_add_socket("user", user)
+      Streamer.stream("user", {user, cm_ref})
+
+      text = StreamerView.render("chat_update.json", %{chat_message_reference: cm_ref})
+
+      assert text =~ "hey cirno"
+      assert_receive {:text, ^text}
+    end
+
+    test "it sends chat message notifications to the 'user:notification' stream", %{user: user} do
+      other_user = insert(:user)
+
+      {:ok, create_activity} = CommonAPI.post_chat_message(other_user, user, "hey")
+
+      notify =
+        Repo.get_by(Pleroma.Notification, user_id: user.id, activity_id: create_activity.id)
+        |> Repo.preload(:activity)
+
+      Streamer.get_topic_and_add_socket("user:notification", user)
+      Streamer.stream("user:notification", notify)
+      assert_receive {:render_with_user, _, _, ^notify}
+      refute Streamer.filtered_by_user?(user, notify)
+    end
+
    test "it doesn't send notify to the 'user:notification' stream when a user is blocked", %{
      user: user
    } do