Add CORS headers

Implement versions endpoint

config/config.exs

@@ -28,6 +28,11 @@ config :phoenix, :json_library, Jason
 
 config :matrix_server, MatrixServer.Repo, migration_timestamps: [type: :utc_datetime]
 
+config :cors_plug,
+  origin: ["*"],
+  methods: ["GET", "POST", "PUT", "DELETE", "OPTIONS"],
+  headers: ["Origin", "X-Requested-With", "Content-Type", "Accept", "Authorization"]
+
 # Import environment specific config. This must remain at the bottom
 # of this file so it overrides the configuration defined above.
 import_config "#{Mix.env()}.exs"

lib/matrix_server_web/controllers/info_controller.ex

@@ -0,0 +1,13 @@
+defmodule MatrixServerWeb.InfoController do
+  use MatrixServerWeb, :controller
+
+  @supported_versions ["r0.6.1"]
+
+  def versions(conn, _params) do
+    data = %{versions: @supported_versions}
+
+    conn
+    |> put_status(200)
+    |> json(data)
+  end
+end

lib/matrix_server_web/endpoint.ex

@@ -38,5 +38,7 @@ defmodule MatrixServerWeb.Endpoint do
   plug Plug.MethodOverride
   plug Plug.Head
   plug Plug.Session, @session_options
+  plug CORSPlug
+
   plug MatrixServerWeb.Router
 end

lib/matrix_server_web/router.ex

@@ -12,5 +12,7 @@ defmodule MatrixServerWeb.Router do
       post "/register", AccountController, :register
       get "/register/available", AccountController, :available
     end
+
+    get "/client/versions", InfoController, :versions
   end
 end

mix.exs

@@ -41,7 +41,8 @@ defmodule MatrixServer.MixProject do
       {:telemetry_poller, "~> 0.4"},
       {:jason, "~> 1.0"},
       {:plug_cowboy, "~> 2.0"},
-      {:bcrypt_elixir, "~> 2.3"}
+      {:bcrypt_elixir, "~> 2.3"},
+      {:cors_plug, "~> 2.0"}
     ]
   end
 

mix.lock

@@ -2,6 +2,7 @@
   "bcrypt_elixir": {:hex, :bcrypt_elixir, "2.3.0", "6cb662d5c1b0a8858801cf20997bd006e7016aa8c52959c9ef80e0f34fb60b7a", [:make, :mix], [{:comeonin, "~> 5.3", [hex: :comeonin, repo: "hexpm", optional: false]}, {:elixir_make, "~> 0.6", [hex: :elixir_make, repo: "hexpm", optional: false]}], "hexpm", "2c81d61d4f6ed0e5cf7bf27a9109b791ff216a1034b3d541327484f46dd43769"},
   "comeonin": {:hex, :comeonin, "5.3.2", "5c2f893d05c56ae3f5e24c1b983c2d5dfb88c6d979c9287a76a7feb1e1d8d646", [:mix], [], "hexpm", "d0993402844c49539aeadb3fe46a3c9bd190f1ecf86b6f9ebd71957534c95f04"},
   "connection": {:hex, :connection, "1.1.0", "ff2a49c4b75b6fb3e674bfc5536451607270aac754ffd1bdfe175abe4a6d7a68", [:mix], [], "hexpm", "722c1eb0a418fbe91ba7bd59a47e28008a189d47e37e0e7bb85585a016b2869c"},
+  "cors_plug": {:hex, :cors_plug, "2.0.3", "316f806d10316e6d10f09473f19052d20ba0a0ce2a1d910ddf57d663dac402ae", [:mix], [{:plug, "~> 1.8", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "ee4ae1418e6ce117fc42c2ba3e6cbdca4e95ecd2fe59a05ec6884ca16d469aea"},
   "cowboy": {:hex, :cowboy, "2.9.0", "865dd8b6607e14cf03282e10e934023a1bd8be6f6bacf921a7e2a96d800cd452", [:make, :rebar3], [{:cowlib, "2.11.0", [hex: :cowlib, repo: "hexpm", optional: false]}, {:ranch, "1.8.0", [hex: :ranch, repo: "hexpm", optional: false]}], "hexpm", "2c729f934b4e1aa149aff882f57c6372c15399a20d54f65c8d67bef583021bde"},
   "cowboy_telemetry": {:hex, :cowboy_telemetry, "0.3.1", "ebd1a1d7aff97f27c66654e78ece187abdc646992714164380d8a041eda16754", [:rebar3], [{:cowboy, "~> 2.7", [hex: :cowboy, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "3a6efd3366130eab84ca372cbd4a7d3c3a97bdfcfb4911233b035d117063f0af"},
   "cowlib": {:hex, :cowlib, "2.11.0", "0b9ff9c346629256c42ebe1eeb769a83c6cb771a6ee5960bd110ab0b9b872063", [:make, :rebar3], [], "hexpm", "2b3e9da0b21c4565751a6d4901c20d1b4cc25cbb7fd50d91d2ab6dd287bc86a9"},