86 lines
2.9 KiB
Elixir
86 lines
2.9 KiB
Elixir
defmodule MatrixServerWeb.Federation.HTTPClient do
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use Tesla
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alias MatrixServerWeb.Endpoint
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alias MatrixServerWeb.Federation.Request.GetSigningKeys
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alias MatrixServerWeb.Federation.Middleware.SignRequest
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alias MatrixServerWeb.Router.Helpers, as: RouteHelpers
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# TODO: Maybe create database-backed homeserver struct to pass to client function.
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# TODO: Fix error propagation.
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@adapter {Tesla.Adapter.Finch, name: MatrixServerWeb.HTTPClient}
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def client(server_name) do
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Tesla.client(
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[
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{Tesla.Middleware.Opts, [server_name: server_name]},
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SignRequest,
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{Tesla.Middleware.BaseUrl, "http://" <> server_name},
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Tesla.Middleware.JSON
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],
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@adapter
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)
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end
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def get_signing_keys(client) do
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path = RouteHelpers.key_path(Endpoint, :get_signing_keys)
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with {:ok,
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%GetSigningKeys{server_name: server_name, verify_keys: verify_keys, signatures: sigs} =
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response} <- tesla_request(:get, client, path, GetSigningKeys),
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serializable_response <- MatrixServer.to_serializable_map(response),
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serializable_response <- Map.drop(serializable_response, [:signatures]),
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{:ok, encoded_body} <- MatrixServer.encode_canonical_json(serializable_response),
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server_sigs when not is_nil(server_sigs) <- sigs[server_name] do
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# For each verify key, check if there is a matching signature.
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# If not, invalidate the whole response.
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Enum.all?(verify_keys, fn {key_id, %{"key" => key}} ->
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with true <- Map.has_key?(server_sigs, key_id),
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{:ok, decoded_key} <- MatrixServer.decode_base64(key),
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{:ok, decoded_sig} <- MatrixServer.decode_base64(server_sigs[key_id]) do
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MatrixServer.sign_verify(decoded_sig, encoded_body, decoded_key)
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else
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_ -> false
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end
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end)
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|> then(fn
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true -> {:ok, response}
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false -> :error
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end)
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else
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_ -> :error
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end
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end
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def query_profile(client, user_id, field \\ nil) do
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path = RouteHelpers.query_path(Endpoint, :profile) |> Tesla.build_url(user_id: user_id)
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path = if field, do: Tesla.build_url(path, field: field), else: path
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Tesla.get(client, path)
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end
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def get_event(client, event_id) do
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path = RouteHelpers.event_path(Endpoint, :event, event_id)
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Tesla.get(client, path)
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end
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def get_state(client, room_id, event_id) do
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path =
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RouteHelpers.event_path(Endpoint, :state, room_id) |> Tesla.build_url(event_id: event_id)
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Tesla.get(client, path)
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end
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defp tesla_request(method, client, path, request_schema) do
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with {:ok, %Tesla.Env{body: body}} <- Tesla.request(client, url: path, method: method),
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%Ecto.Changeset{valid?: true} = cs <- apply(request_schema, :changeset, [body]) do
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{:ok, Ecto.Changeset.apply_changes(cs)}
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else
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x ->
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IO.inspect(x)
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:error
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end
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end
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end
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