Add migration and schema for accounts

Add account name availability endpoint

lib/matrix_server/account.ex

@@ -0,0 +1,51 @@
+defmodule MatrixServer.Account do
+  use Ecto.Schema
+  import Ecto.{Changeset, Query}
+  alias MatrixServer.{Repo, Account}
+
+  @max_mxid_length 255
+  @localpart_regex ~r/^([a-z0-9\._=\/])+$/
+
+  @primary_key {:localpart, :string, []}
+  schema "accounts" do
+    field :password_hash, :string, redact: true
+
+    timestamps(updated_at: false)
+  end
+
+  def available?(localpart) when is_binary(localpart) do
+    if Regex.match?(@localpart_regex, localpart) and
+         String.length(localpart) <= localpart_length() do
+      if Repo.one!(
+           Account
+           |> where([a], a.localpart == ^localpart)
+           |> select([a], count(a))
+         ) == 0 do
+        :ok
+      else
+        {:error, :user_in_use}
+      end
+    else
+      {:error, :invalid_username}
+    end
+  end
+
+  def changeset(%Account{} = account, attrs) do
+    account
+    |> cast(attrs, [:localpart, :password_hash])
+    |> validate_required([:localpart, :password_hash])
+    |> validate_length(:password_hash, max: 60)
+    |> validate_format(:localpart, @localpart_regex)
+    |> validate_length(:localpart, max: localpart_length())
+    |> unique_constraint(:localpart, name: :accounts_pkey)
+  end
+
+  defp localpart_length do
+    # Subtract the "@" and ":" in the MXID.
+    @max_mxid_length - 2 - String.length(server_name())
+  end
+
+  defp server_name do
+    Application.get_env(:matrix_server, :server_name)
+  end
+end

lib/matrix_server_web/channels/user_socket.ex

@@ -1,35 +0,0 @@
-defmodule MatrixServerWeb.UserSocket do
-  use Phoenix.Socket
-
-  ## Channels
-  # channel "room:*", MatrixServerWeb.RoomChannel
-
-  # Socket params are passed from the client and can
-  # be used to verify and authenticate a user. After
-  # verification, you can put default assigns into
-  # the socket that will be set for all channels, ie
-  #
-  #     {:ok, assign(socket, :user_id, verified_user_id)}
-  #
-  # To deny connection, return `:error`.
-  #
-  # See `Phoenix.Token` documentation for examples in
-  # performing token verification on connect.
-  @impl true
-  def connect(_params, socket, _connect_info) do
-    {:ok, socket}
-  end
-
-  # Socket id's are topics that allow you to identify all sockets for a given user:
-  #
-  #     def id(socket), do: "user_socket:#{socket.assigns.user_id}"
-  #
-  # Would allow you to broadcast a "disconnect" event and terminate
-  # all active sockets and channels for a given user:
-  #
-  #     MatrixServerWeb.Endpoint.broadcast("user_socket:#{user.id}", "disconnect", %{})
-  #
-  # Returning `nil` makes this socket anonymous.
-  @impl true
-  def id(_socket), do: nil
-end

lib/matrix_server_web/controllers/account_controller.ex

@@ -0,0 +1,28 @@
+defmodule MatrixServerWeb.AccountController do
+  use MatrixServerWeb, :controller
+  alias MatrixServer.Account
+
+  def register(conn, _params) do
+    conn
+  end
+
+  def available(conn, params) do
+    localpart = Map.get(params, "username", "")
+
+    {status, data} =
+      case Account.available?(localpart) do
+        :ok ->
+          {200, %{available: true}}
+
+        {:error, :user_in_use} ->
+          {400, %{errcode: "M_USER_IN_USE", error: "Desired user ID is already taken."}}
+
+        {:error, :invalid_username} ->
+          {400, %{errocode: "M_INVALID_USERNAME", error: "Desired user ID is invalid."}}
+      end
+
+    conn
+    |> put_status(status)
+    |> json(data)
+  end
+end

lib/matrix_server_web/endpoint.ex

@@ -10,10 +10,6 @@ defmodule MatrixServerWeb.Endpoint do
     signing_salt: "IGPHtnAo"
   ]
 
-  socket "/socket", MatrixServerWeb.UserSocket,
-    websocket: true,
-    longpoll: false
-
   # Serve at "/" the static files from "priv/static" directory.
   #
   # You should set gzip to true if you are running phx.digest

lib/matrix_server_web/router.ex

@@ -5,7 +5,12 @@ defmodule MatrixServerWeb.Router do
     plug :accepts, ["json"]
   end
 
-  scope "/api", MatrixServerWeb do
+  scope "/_matrix", MatrixServerWeb do
     pipe_through :api
+
+    scope "/client/r0", as: :client do
+      post "/register", AccountController, :register
+      get "/register/available", AccountController, :available
+    end
   end
 end