Introduce Pleroma.Config.url/0 to bypass compile-time deps on Endpoint

lib/pleroma/config.ex

@@ -103,4 +103,25 @@ defmodule Pleroma.Config do
   def feature_enabled?(feature_name) do
     get([:features, feature_name]) not in [nil, false, :disabled, :auto]
   end
+
+  @doc """
+  Get the URI directly from application config, bypassing the Endpoint module.
+  """
+  def uri do
+    # `Pleroma.Web.Endpoint` is only being used as a key here (for equality check),
+    # so it's okay to use `Module.concat/1` to have the compiler ignore it.
+    endpoint_key = Module.concat(["Pleroma.Web.Endpoint"])
+
+    url =
+      get([endpoint_key, :url])
+      |> Map.new()
+
+    struct(URI, url)
+  end
+
+  @doc """
+  Similar to `Pleroma.Web.Endpoint.url/0`.
+  May be used where needed to avoid a compile-time dep on Endpoint.
+  """
+  def url, do: URI.to_string(uri())
 end

lib/pleroma/ecto_type/activity_pub/object_validators/context_id.ex

@@ -6,7 +6,7 @@ defmodule Pleroma.EctoType.ActivityPub.ObjectValidators.ContextID do
   use Ecto.Type
 
   alias Ecto.UUID
-  alias Pleroma.Web.Endpoint
+  alias Pleroma.Config
 
   def type, do: :string
 
@@ -19,6 +19,6 @@ defmodule Pleroma.EctoType.ActivityPub.ObjectValidators.ContextID do
   def load(data), do: {:ok, data}
 
   def autogenerate do
-    "#{Endpoint.url()}/contexts/#{UUID.generate()}"
+    "#{Config.url()}/contexts/#{UUID.generate()}"
   end
 end

test/pleroma/config_test.exs

@@ -136,4 +136,26 @@ defmodule Pleroma.ConfigTest do
     Pleroma.Config.delete([:lorem])
     Pleroma.Config.delete([:ipsum])
   end
+
+  describe "URI functions" do
+    setup do
+      url = [host: "lain.com", scheme: "https", port: 443]
+      clear_config([Pleroma.Web.Endpoint, :url], url)
+    end
+
+    test "uri/0" do
+      expected = %URI{
+        scheme: "https",
+        host: "lain.com",
+        port: 443
+      }
+
+      assert Pleroma.Config.uri() == expected
+    end
+
+    test "url/0" do
+      expected = "https://lain.com"
+      assert Pleroma.Config.url() == expected
+    end
+  end
 end