chore: setup CORS

config/dev.exs

@@ -65,6 +65,9 @@ config :phoenix, :plug_init_mode, :runtime
 # Disable swoosh api client as it is only required for production adapters.
 config :swoosh, :api_client, false
 
+# Config setup for Corsica
+config :atlas, :allowed_origins, "*"
+
 config :atlas, Atlas.Accounts.Guardian,
   issuer: "atlas",
   secret_key: "your-dev-secret-key-here-make-it-long-enough",

config/prod.exs

@@ -9,5 +9,14 @@ config :swoosh, local: false
 # Do not print debug messages in production
 config :logger, level: :info
 
+# Configures CORS allowed origins
+config :atlas,
+       :allowed_origins,
+       System.get_env("FRONTEND_URL") ||
+         raise("""
+         environment variable FRONTEND_URL is missing.
+         This should be the URL of your frontend application.
+         """)
+
 # Runtime production configuration, including reading
 # of environment variables, is done on config/runtime.exs.

lib/atlas_web/endpoint.ex

@@ -47,5 +47,12 @@ defmodule AtlasWeb.Endpoint do
   plug Plug.MethodOverride
   plug Plug.Head
   plug Plug.Session, @session_options
+
+  plug Corsica,
+    origins: Application.compile_env(:atlas, :allowed_origins),
+    log: [rejected: :error],
+    allow_credentials: true,
+    allow_headers: ["authorization", "content-type", "accept"]
+
   plug AtlasWeb.Router
 end

mix.exs

@@ -64,6 +64,9 @@ defmodule Atlas.MixProject do
       {:dns_cluster, "~> 0.1.1"},
       {:bandit, "~> 1.2"},
 
+      # cors
+      {:corsica, "~> 2.1.3"},
+
       # utilities
       {:remote_ip, "~> 1.2"},
       {:ua_parser, "~> 1.8"}

mix.lock

@@ -3,6 +3,7 @@
   "bcrypt_elixir": {:hex, :bcrypt_elixir, "3.3.2", "d50091e3c9492d73e17fc1e1619a9b09d6a5ef99160eb4d736926fd475a16ca3", [:make, :mix], [{:comeonin, "~> 5.3", [hex: :comeonin, repo: "hexpm", optional: false]}, {:elixir_make, "~> 0.6", [hex: :elixir_make, repo: "hexpm", optional: false]}], "hexpm", "471be5151874ae7931911057d1467d908955f93554f7a6cd1b7d804cac8cef53"},
   "bunt": {:hex, :bunt, "1.0.0", "081c2c665f086849e6d57900292b3a161727ab40431219529f13c4ddcf3e7a44", [:mix], [], "hexpm", "dc5f86aa08a5f6fa6b8096f0735c4e76d54ae5c9fa2c143e5a1fc7c1cd9bb6b5"},
   "castore": {:hex, :castore, "1.0.14", "4582dd7d630b48cf5e1ca8d3d42494db51e406b7ba704e81fbd401866366896a", [:mix], [], "hexpm", "7bc1b65249d31701393edaaac18ec8398d8974d52c647b7904d01b964137b9f4"},
+  "corsica": {:hex, :corsica, "2.1.3", "dccd094ffce38178acead9ae743180cdaffa388f35f0461ba1e8151d32e190e6", [:mix], [{:plug, "~> 1.0", [hex: :plug, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4.0 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "616c08f61a345780c2cf662ff226816f04d8868e12054e68963e95285b5be8bc"},
   "combine": {:hex, :combine, "0.10.0", "eff8224eeb56498a2af13011d142c5e7997a80c8f5b97c499f84c841032e429f", [:mix], [], "hexpm", "1b1dbc1790073076580d0d1d64e42eae2366583e7aecd455d1215b0d16f2451b"},
   "comeonin": {:hex, :comeonin, "5.5.1", "5113e5f3800799787de08a6e0db307133850e635d34e9fab23c70b6501669510", [:mix], [], "hexpm", "65aac8f19938145377cee73973f192c5645873dcf550a8a6b18187d17c13ccdb"},
   "credo": {:hex, :credo, "1.7.12", "9e3c20463de4b5f3f23721527fcaf16722ec815e70ff6c60b86412c695d426c1", [:mix], [{:bunt, "~> 0.2.1 or ~> 1.0", [hex: :bunt, repo: "hexpm", optional: false]}, {:file_system, "~> 0.2 or ~> 1.0", [hex: :file_system, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "8493d45c656c5427d9c729235b99d498bd133421f3e0a683e5c1b561471291e5"},