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diff --git a/lib/pleroma/web/api_spec/operations/timeline_operation.ex b/lib/pleroma/web/api_spec/operations/timeline_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.TimelineOperation do
+  alias OpenApiSpex.Operation
+  alias OpenApiSpex.Schema
+  alias Pleroma.Web.ApiSpec.Schemas.ApiError
+  alias Pleroma.Web.ApiSpec.Schemas.BooleanLike
+  alias Pleroma.Web.ApiSpec.Schemas.Status
+  alias Pleroma.Web.ApiSpec.Schemas.VisibilityScope
+
+  import Pleroma.Web.ApiSpec.Helpers
+
+  def open_api_operation(action) do
+    operation = String.to_existing_atom("#{action}_operation")
+    apply(__MODULE__, operation, [])
+  end
+
+  def home_operation do
+    %Operation{
+      tags: ["Timelines"],
+      summary: "Home timeline",
+      description: "View statuses from followed users",
+      security: [%{"oAuth" => ["read:statuses"]}],
+      parameters: [
+        local_param(),
+        with_muted_param(),
+        exclude_visibilities_param(),
+        reply_visibility_param(),
+        with_relationships_param() | pagination_params()
+      ],
+      operationId: "TimelineController.home",
+      responses: %{
+        200 => Operation.response("Array of Status", "application/json", array_of_statuses())
+      }
+    }
+  end
+
+  def direct_operation do
+    %Operation{
+      tags: ["Timelines"],
+      summary: "Direct timeline",
+      description:
+        "View statuses with a “direct” privacy, from your account or in your notifications",
+      deprecated: true,
+      parameters: pagination_params(),
+      security: [%{"oAuth" => ["read:statuses"]}],
+      operationId: "TimelineController.direct",
+      responses: %{
+        200 => Operation.response("Array of Status", "application/json", array_of_statuses())
+      }
+    }
+  end
+
+  def public_operation do
+    %Operation{
+      tags: ["Timelines"],
+      summary: "Public timeline",
+      security: [%{"oAuth" => ["read:statuses"]}],
+      parameters: [
+        local_param(),
+        only_media_param(),
+        with_muted_param(),
+        exclude_visibilities_param(),
+        reply_visibility_param(),
+        with_relationships_param() | pagination_params()
+      ],
+      operationId: "TimelineController.public",
+      responses: %{
+        200 => Operation.response("Array of Status", "application/json", array_of_statuses()),
+        401 => Operation.response("Error", "application/json", ApiError)
+      }
+    }
+  end
+
+  def hashtag_operation do
+    %Operation{
+      tags: ["Timelines"],
+      summary: "Hashtag timeline",
+      description: "View public statuses containing the given hashtag",
+      security: [%{"oAuth" => ["read:statuses"]}],
+      parameters: [
+        Operation.parameter(
+          :tag,
+          :path,
+          %Schema{type: :string},
+          "Content of a #hashtag, not including # symbol.",
+          required: true
+        ),
+        Operation.parameter(
+          :any,
+          :query,
+          %Schema{type: :array, items: %Schema{type: :string}},
+          "Statuses that also includes any of these tags"
+        ),
+        Operation.parameter(
+          :all,
+          :query,
+          %Schema{type: :array, items: %Schema{type: :string}},
+          "Statuses that also includes all of these tags"
+        ),
+        Operation.parameter(
+          :none,
+          :query,
+          %Schema{type: :array, items: %Schema{type: :string}},
+          "Statuses that do not include these tags"
+        ),
+        local_param(),
+        only_media_param(),
+        with_muted_param(),
+        exclude_visibilities_param(),
+        with_relationships_param() | pagination_params()
+      ],
+      operationId: "TimelineController.hashtag",
+      responses: %{
+        200 => Operation.response("Array of Status", "application/json", array_of_statuses())
+      }
+    }
+  end
+
+  def list_operation do
+    %Operation{
+      tags: ["Timelines"],
+      summary: "List timeline",
+      description: "View statuses in the given list timeline",
+      security: [%{"oAuth" => ["read:lists"]}],
+      parameters: [
+        Operation.parameter(
+          :list_id,
+          :path,
+          %Schema{type: :string},
+          "Local ID of the list in the database",
+          required: true
+        ),
+        with_muted_param(),
+        exclude_visibilities_param(),
+        with_relationships_param() | pagination_params()
+      ],
+      operationId: "TimelineController.list",
+      responses: %{
+        200 => Operation.response("Array of Status", "application/json", array_of_statuses())
+      }
+    }
+  end
+
+  defp array_of_statuses do
+    %Schema{
+      title: "ArrayOfStatuses",
+      type: :array,
+      items: Status,
+      example: [Status.schema().example]
+    }
+  end
+
+  defp with_relationships_param do
+    Operation.parameter(:with_relationships, :query, BooleanLike, "Include relationships")
+  end
+
+  defp local_param do
+    Operation.parameter(
+      :local,
+      :query,
+      %Schema{allOf: [BooleanLike], default: false},
+      "Show only local statuses?"
+    )
+  end
+
+  defp with_muted_param do
+    Operation.parameter(:with_muted, :query, BooleanLike, "Includeactivities by muted users")
+  end
+
+  defp exclude_visibilities_param do
+    Operation.parameter(
+      :exclude_visibilities,
+      :query,
+      %Schema{type: :array, items: VisibilityScope},
+      "Exclude the statuses with the given visibilities"
+    )
+  end
+
+  defp reply_visibility_param do
+    Operation.parameter(
+      :reply_visibility,
+      :query,
+      %Schema{type: :string, enum: ["following", "self"]},
+      "Filter replies. Possible values: without parameter (default) shows all replies, `following` - replies directed to you or users you follow, `self` - replies directed to you."
+    )
+  end
+
+  defp only_media_param do
+    Operation.parameter(
+      :only_media,
+      :query,
+      %Schema{allOf: [BooleanLike], default: false},
+      "Show only statuses with media attached?"
+    )
+  end
+end