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diff --git a/lib/pleroma/web/api_spec/operations/marker_operation.ex b/lib/pleroma/web/api_spec/operations/marker_operation.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ApiSpec.MarkerOperation do
+  alias OpenApiSpex.Operation
+  alias OpenApiSpex.Schema
+  alias Pleroma.Web.ApiSpec.Helpers
+
+  def open_api_operation(action) do
+    operation = String.to_existing_atom("#{action}_operation")
+    apply(__MODULE__, operation, [])
+  end
+
+  def index_operation do
+    %Operation{
+      tags: ["Markers"],
+      summary: "Get saved timeline position",
+      security: [%{"oAuth" => ["read:statuses"]}],
+      operationId: "MarkerController.index",
+      parameters: [
+        Operation.parameter(
+          :timeline,
+          :query,
+          %Schema{
+            type: :array,
+            items: %Schema{type: :string, enum: ["home", "notifications"]}
+          },
+          "Array of markers to fetch. If not provided, an empty object will be returned."
+        )
+      ],
+      responses: %{
+        200 => Operation.response("Marker", "application/json", response()),
+        403 => Operation.response("Error", "application/json", api_error())
+      }
+    }
+  end
+
+  def upsert_operation do
+    %Operation{
+      tags: ["Markers"],
+      summary: "Save position in timeline",
+      operationId: "MarkerController.upsert",
+      requestBody: Helpers.request_body("Parameters", upsert_request(), required: true),
+      security: [%{"oAuth" => ["follow", "write:blocks"]}],
+      responses: %{
+        200 => Operation.response("Marker", "application/json", response()),
+        403 => Operation.response("Error", "application/json", api_error())
+      }
+    }
+  end
+
+  defp marker do
+    %Schema{
+      title: "Marker",
+      description: "Schema for a marker",
+      type: :object,
+      properties: %{
+        last_read_id: %Schema{type: :string},
+        version: %Schema{type: :integer},
+        updated_at: %Schema{type: :string},
+        pleroma: %Schema{
+          type: :object,
+          properties: %{
+            unread_count: %Schema{type: :integer}
+          }
+        }
+      },
+      example: %{
+        "last_read_id" => "35098814",
+        "version" => 361,
+        "updated_at" => "2019-11-26T22:37:25.239Z",
+        "pleroma" => %{"unread_count" => 5}
+      }
+    }
+  end
+
+  defp response do
+    %Schema{
+      title: "MarkersResponse",
+      description: "Response schema for markers",
+      type: :object,
+      properties: %{
+        notifications: %Schema{allOf: [marker()], nullable: true},
+        home: %Schema{allOf: [marker()], nullable: true}
+      },
+      items: %Schema{type: :string},
+      example: %{
+        "notifications" => %{
+          "last_read_id" => "35098814",
+          "version" => 361,
+          "updated_at" => "2019-11-26T22:37:25.239Z",
+          "pleroma" => %{"unread_count" => 0}
+        },
+        "home" => %{
+          "last_read_id" => "103206604258487607",
+          "version" => 468,
+          "updated_at" => "2019-11-26T22:37:25.235Z",
+          "pleroma" => %{"unread_count" => 10}
+        }
+      }
+    }
+  end
+
+  defp upsert_request do
+    %Schema{
+      title: "MarkersUpsertRequest",
+      description: "Request schema for marker upsert",
+      type: :object,
+      properties: %{
+        notifications: %Schema{
+          type: :object,
+          nullable: true,
+          properties: %{
+            last_read_id: %Schema{nullable: true, type: :string}
+          }
+        },
+        home: %Schema{
+          type: :object,
+          nullable: true,
+          properties: %{
+            last_read_id: %Schema{nullable: true, type: :string}
+          }
+        }
+      },
+      example: %{
+        "home" => %{
+          "last_read_id" => "103194548672408537",
+          "version" => 462,
+          "updated_at" => "2019-11-24T19:39:39.337Z"
+        }
+      }
+    }
+  end
+
+  defp api_error do
+    %Schema{
+      type: :object,
+      properties: %{error: %Schema{type: :string}}
+    }
+  end
+end