Merge remote-tracking branch 'origin/develop' into matrixmatrix

7 files changed, 2004 insertions, 0 deletions

diff --git a/test/pleroma/web/o_auth/app_test.exs b/test/pleroma/web/o_auth/app_test.exs
new file mode 100644
index 000000000..a5223b0a5
--- /dev/null
+++ b/test/pleroma/web/o_auth/app_test.exs
@@ -0,0 +1,56 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.OAuth.AppTest do
+  use Pleroma.DataCase, async: true
+
+  alias Pleroma.Web.OAuth.App
+  import Pleroma.Factory
+
+  describe "get_or_make/2" do
+    test "gets exist app" do
+      attrs = %{client_name: "Mastodon-Local", redirect_uris: "."}
+      app = insert(:oauth_app, Map.merge(attrs, %{scopes: ["read", "write"]}))
+      {:ok, %App{} = exist_app} = App.get_or_make(attrs, [])
+      assert exist_app == app
+    end
+
+    test "make app" do
+      attrs = %{client_name: "Mastodon-Local", redirect_uris: "."}
+      {:ok, %App{} = app} = App.get_or_make(attrs, ["write"])
+      assert app.scopes == ["write"]
+    end
+
+    test "gets exist app and updates scopes" do
+      attrs = %{client_name: "Mastodon-Local", redirect_uris: "."}
+      app = insert(:oauth_app, Map.merge(attrs, %{scopes: ["read", "write"]}))
+      {:ok, %App{} = exist_app} = App.get_or_make(attrs, ["read", "write", "follow", "push"])
+      assert exist_app.id == app.id
+      assert exist_app.scopes == ["read", "write", "follow", "push"]
+    end
+
+    test "has unique client_id" do
+      insert(:oauth_app, client_name: "", redirect_uris: "", client_id: "boop")
+
+      error =
+        catch_error(insert(:oauth_app, client_name: "", redirect_uris: "", client_id: "boop"))
+
+      assert %Ecto.ConstraintError{} = error
+      assert error.constraint == "apps_client_id_index"
+      assert error.type == :unique
+    end
+  end
+
+  test "get_user_apps/1" do
+    user = insert(:user)
+
+    apps = [
+      insert(:oauth_app, user_id: user.id),
+      insert(:oauth_app, user_id: user.id),
+      insert(:oauth_app, user_id: user.id)
+    ]
+
+    assert App.get_user_apps(user) == apps
+  end
+end
diff --git a/test/pleroma/web/o_auth/authorization_test.exs b/test/pleroma/web/o_auth/authorization_test.exs
new file mode 100644
index 000000000..fc1c04c4c
--- /dev/null
+++ b/test/pleroma/web/o_auth/authorization_test.exs
@@ -0,0 +1,77 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.OAuth.AuthorizationTest do
+  use Pleroma.DataCase, async: true
+  alias Pleroma.Web.OAuth.App
+  alias Pleroma.Web.OAuth.Authorization
+  import Pleroma.Factory
+
+  setup do
+    {:ok, app} =
+      Repo.insert(
+        App.register_changeset(%App{}, %{
+          client_name: "client",
+          scopes: ["read", "write"],
+          redirect_uris: "url"
+        })
+      )
+
+    %{app: app}
+  end
+
+  test "create an authorization token for a valid app", %{app: app} do
+    user = insert(:user)
+
+    {:ok, auth1} = Authorization.create_authorization(app, user)
+    assert auth1.scopes == app.scopes
+
+    {:ok, auth2} = Authorization.create_authorization(app, user, ["read"])
+    assert auth2.scopes == ["read"]
+
+    for auth <- [auth1, auth2] do
+      assert auth.user_id == user.id
+      assert auth.app_id == app.id
+      assert String.length(auth.token) > 10
+      assert auth.used == false
+    end
+  end
+
+  test "use up a token", %{app: app} do
+    user = insert(:user)
+
+    {:ok, auth} = Authorization.create_authorization(app, user)
+
+    {:ok, auth} = Authorization.use_token(auth)
+
+    assert auth.used == true
+
+    assert {:error, "already used"} == Authorization.use_token(auth)
+
+    expired_auth = %Authorization{
+      user_id: user.id,
+      app_id: app.id,
+      valid_until: NaiveDateTime.add(NaiveDateTime.utc_now(), -10),
+      token: "mytoken",
+      used: false
+    }
+
+    {:ok, expired_auth} = Repo.insert(expired_auth)
+
+    assert {:error, "token expired"} == Authorization.use_token(expired_auth)
+  end
+
+  test "delete authorizations", %{app: app} do
+    user = insert(:user)
+
+    {:ok, auth} = Authorization.create_authorization(app, user)
+    {:ok, auth} = Authorization.use_token(auth)
+
+    Authorization.delete_user_authorizations(user)
+
+    {_, invalid} = Authorization.use_token(auth)
+
+    assert auth != invalid
+  end
+end
diff --git a/test/pleroma/web/o_auth/ldap_authorization_test.exs b/test/pleroma/web/o_auth/ldap_authorization_test.exs
new file mode 100644
index 000000000..61b9ce6b7
--- /dev/null
+++ b/test/pleroma/web/o_auth/ldap_authorization_test.exs
@@ -0,0 +1,135 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.OAuth.LDAPAuthorizationTest do
+  use Pleroma.Web.ConnCase
+  alias Pleroma.Repo
+  alias Pleroma.Web.OAuth.Token
+  import Pleroma.Factory
+  import Mock
+
+  @skip if !Code.ensure_loaded?(:eldap), do: :skip
+
+  setup_all do: clear_config([:ldap, :enabled], true)
+
+  setup_all do: clear_config(Pleroma.Web.Auth.Authenticator, Pleroma.Web.Auth.LDAPAuthenticator)
+
+  @tag @skip
+  test "authorizes the existing user using LDAP credentials" do
+    password = "testpassword"
+    user = insert(:user, password_hash: Pleroma.Password.Pbkdf2.hash_pwd_salt(password))
+    app = insert(:oauth_app, scopes: ["read", "write"])
+
+    host = Pleroma.Config.get([:ldap, :host]) |> to_charlist
+    port = Pleroma.Config.get([:ldap, :port])
+
+    with_mocks [
+      {:eldap, [],
+       [
+         open: fn [^host], [{:port, ^port}, {:ssl, false} | _] -> {:ok, self()} end,
+         simple_bind: fn _connection, _dn, ^password -> :ok end,
+         close: fn _connection ->
+           send(self(), :close_connection)
+           :ok
+         end
+       ]}
+    ] do
+      conn =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "password",
+          "username" => user.nickname,
+          "password" => password,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+
+      assert %{"access_token" => token} = json_response(conn, 200)
+
+      token = Repo.get_by(Token, token: token)
+
+      assert token.user_id == user.id
+      assert_received :close_connection
+    end
+  end
+
+  @tag @skip
+  test "creates a new user after successful LDAP authorization" do
+    password = "testpassword"
+    user = build(:user)
+    app = insert(:oauth_app, scopes: ["read", "write"])
+
+    host = Pleroma.Config.get([:ldap, :host]) |> to_charlist
+    port = Pleroma.Config.get([:ldap, :port])
+
+    with_mocks [
+      {:eldap, [],
+       [
+         open: fn [^host], [{:port, ^port}, {:ssl, false} | _] -> {:ok, self()} end,
+         simple_bind: fn _connection, _dn, ^password -> :ok end,
+         equalityMatch: fn _type, _value -> :ok end,
+         wholeSubtree: fn -> :ok end,
+         search: fn _connection, _options ->
+           {:ok, {:eldap_search_result, [{:eldap_entry, '', []}], []}}
+         end,
+         close: fn _connection ->
+           send(self(), :close_connection)
+           :ok
+         end
+       ]}
+    ] do
+      conn =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "password",
+          "username" => user.nickname,
+          "password" => password,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+
+      assert %{"access_token" => token} = json_response(conn, 200)
+
+      token = Repo.get_by(Token, token: token) |> Repo.preload(:user)
+
+      assert token.user.nickname == user.nickname
+      assert_received :close_connection
+    end
+  end
+
+  @tag @skip
+  test "disallow authorization for wrong LDAP credentials" do
+    password = "testpassword"
+    user = insert(:user, password_hash: Pleroma.Password.Pbkdf2.hash_pwd_salt(password))
+    app = insert(:oauth_app, scopes: ["read", "write"])
+
+    host = Pleroma.Config.get([:ldap, :host]) |> to_charlist
+    port = Pleroma.Config.get([:ldap, :port])
+
+    with_mocks [
+      {:eldap, [],
+       [
+         open: fn [^host], [{:port, ^port}, {:ssl, false} | _] -> {:ok, self()} end,
+         simple_bind: fn _connection, _dn, ^password -> {:error, :invalidCredentials} end,
+         close: fn _connection ->
+           send(self(), :close_connection)
+           :ok
+         end
+       ]}
+    ] do
+      conn =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "password",
+          "username" => user.nickname,
+          "password" => password,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+
+      assert %{"error" => "Invalid credentials"} = json_response(conn, 400)
+      assert_received :close_connection
+    end
+  end
+end
diff --git a/test/pleroma/web/o_auth/mfa_controller_test.exs b/test/pleroma/web/o_auth/mfa_controller_test.exs
new file mode 100644
index 000000000..17bbde85b
--- /dev/null
+++ b/test/pleroma/web/o_auth/mfa_controller_test.exs
@@ -0,0 +1,304 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.OAuth.MFAControllerTest do
+  use Pleroma.Web.ConnCase, async: true
+  import Pleroma.Factory
+
+  alias Pleroma.MFA
+  alias Pleroma.MFA.BackupCodes
+  alias Pleroma.MFA.TOTP
+  alias Pleroma.Repo
+  alias Pleroma.Web.OAuth.Authorization
+  alias Pleroma.Web.OAuth.OAuthController
+
+  setup %{conn: conn} do
+    otp_secret = TOTP.generate_secret()
+
+    user =
+      insert(:user,
+        multi_factor_authentication_settings: %MFA.Settings{
+          enabled: true,
+          backup_codes: [Pleroma.Password.Pbkdf2.hash_pwd_salt("test-code")],
+          totp: %MFA.Settings.TOTP{secret: otp_secret, confirmed: true}
+        }
+      )
+
+    app = insert(:oauth_app)
+    {:ok, conn: conn, user: user, app: app}
+  end
+
+  describe "show" do
+    setup %{conn: conn, user: user, app: app} do
+      mfa_token =
+        insert(:mfa_token,
+          user: user,
+          authorization: build(:oauth_authorization, app: app, scopes: ["write"])
+        )
+
+      {:ok, conn: conn, mfa_token: mfa_token}
+    end
+
+    test "GET /oauth/mfa renders mfa forms", %{conn: conn, mfa_token: mfa_token} do
+      conn =
+        get(
+          conn,
+          "/oauth/mfa",
+          %{
+            "mfa_token" => mfa_token.token,
+            "state" => "a_state",
+            "redirect_uri" => "http://localhost:8080/callback"
+          }
+        )
+
+      assert response = html_response(conn, 200)
+      assert response =~ "Two-factor authentication"
+      assert response =~ mfa_token.token
+      assert response =~ "http://localhost:8080/callback"
+    end
+
+    test "GET /oauth/mfa renders mfa recovery forms", %{conn: conn, mfa_token: mfa_token} do
+      conn =
+        get(
+          conn,
+          "/oauth/mfa",
+          %{
+            "mfa_token" => mfa_token.token,
+            "state" => "a_state",
+            "redirect_uri" => "http://localhost:8080/callback",
+            "challenge_type" => "recovery"
+          }
+        )
+
+      assert response = html_response(conn, 200)
+      assert response =~ "Two-factor recovery"
+      assert response =~ mfa_token.token
+      assert response =~ "http://localhost:8080/callback"
+    end
+  end
+
+  describe "verify" do
+    setup %{conn: conn, user: user, app: app} do
+      mfa_token =
+        insert(:mfa_token,
+          user: user,
+          authorization: build(:oauth_authorization, app: app, scopes: ["write"])
+        )
+
+      {:ok, conn: conn, user: user, mfa_token: mfa_token, app: app}
+    end
+
+    test "POST /oauth/mfa/verify, verify totp code", %{
+      conn: conn,
+      user: user,
+      mfa_token: mfa_token,
+      app: app
+    } do
+      otp_token = TOTP.generate_token(user.multi_factor_authentication_settings.totp.secret)
+
+      conn =
+        conn
+        |> post("/oauth/mfa/verify", %{
+          "mfa" => %{
+            "mfa_token" => mfa_token.token,
+            "challenge_type" => "totp",
+            "code" => otp_token,
+            "state" => "a_state",
+            "redirect_uri" => OAuthController.default_redirect_uri(app)
+          }
+        })
+
+      target = redirected_to(conn)
+      target_url = %URI{URI.parse(target) | query: nil} |> URI.to_string()
+      query = URI.parse(target).query |> URI.query_decoder() |> Map.new()
+      assert %{"state" => "a_state", "code" => code} = query
+      assert target_url == OAuthController.default_redirect_uri(app)
+      auth = Repo.get_by(Authorization, token: code)
+      assert auth.scopes == ["write"]
+    end
+
+    test "POST /oauth/mfa/verify, verify recovery code", %{
+      conn: conn,
+      mfa_token: mfa_token,
+      app: app
+    } do
+      conn =
+        conn
+        |> post("/oauth/mfa/verify", %{
+          "mfa" => %{
+            "mfa_token" => mfa_token.token,
+            "challenge_type" => "recovery",
+            "code" => "test-code",
+            "state" => "a_state",
+            "redirect_uri" => OAuthController.default_redirect_uri(app)
+          }
+        })
+
+      target = redirected_to(conn)
+      target_url = %URI{URI.parse(target) | query: nil} |> URI.to_string()
+      query = URI.parse(target).query |> URI.query_decoder() |> Map.new()
+      assert %{"state" => "a_state", "code" => code} = query
+      assert target_url == OAuthController.default_redirect_uri(app)
+      auth = Repo.get_by(Authorization, token: code)
+      assert auth.scopes == ["write"]
+    end
+  end
+
+  describe "challenge/totp" do
+    test "returns access token with valid code", %{conn: conn, user: user, app: app} do
+      otp_token = TOTP.generate_token(user.multi_factor_authentication_settings.totp.secret)
+
+      mfa_token =
+        insert(:mfa_token,
+          user: user,
+          authorization: build(:oauth_authorization, app: app, scopes: ["write"])
+        )
+
+      response =
+        conn
+        |> post("/oauth/mfa/challenge", %{
+          "mfa_token" => mfa_token.token,
+          "challenge_type" => "totp",
+          "code" => otp_token,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+        |> json_response(:ok)
+
+      ap_id = user.ap_id
+
+      assert match?(
+               %{
+                 "access_token" => _,
+                 "me" => ^ap_id,
+                 "refresh_token" => _,
+                 "scope" => "write",
+                 "token_type" => "Bearer"
+               },
+               response
+             )
+    end
+
+    test "returns errors when mfa token invalid", %{conn: conn, user: user, app: app} do
+      otp_token = TOTP.generate_token(user.multi_factor_authentication_settings.totp.secret)
+
+      response =
+        conn
+        |> post("/oauth/mfa/challenge", %{
+          "mfa_token" => "XXX",
+          "challenge_type" => "totp",
+          "code" => otp_token,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+        |> json_response(400)
+
+      assert response == %{"error" => "Invalid code"}
+    end
+
+    test "returns error when otp code is invalid", %{conn: conn, user: user, app: app} do
+      mfa_token = insert(:mfa_token, user: user)
+
+      response =
+        conn
+        |> post("/oauth/mfa/challenge", %{
+          "mfa_token" => mfa_token.token,
+          "challenge_type" => "totp",
+          "code" => "XXX",
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+        |> json_response(400)
+
+      assert response == %{"error" => "Invalid code"}
+    end
+
+    test "returns error when client credentails is wrong ", %{conn: conn, user: user} do
+      otp_token = TOTP.generate_token(user.multi_factor_authentication_settings.totp.secret)
+      mfa_token = insert(:mfa_token, user: user)
+
+      response =
+        conn
+        |> post("/oauth/mfa/challenge", %{
+          "mfa_token" => mfa_token.token,
+          "challenge_type" => "totp",
+          "code" => otp_token,
+          "client_id" => "xxx",
+          "client_secret" => "xxx"
+        })
+        |> json_response(400)
+
+      assert response == %{"error" => "Invalid code"}
+    end
+  end
+
+  describe "challenge/recovery" do
+    setup %{conn: conn} do
+      app = insert(:oauth_app)
+      {:ok, conn: conn, app: app}
+    end
+
+    test "returns access token with valid code", %{conn: conn, app: app} do
+      otp_secret = TOTP.generate_secret()
+
+      [code | _] = backup_codes = BackupCodes.generate()
+
+      hashed_codes =
+        backup_codes
+        |> Enum.map(&Pleroma.Password.Pbkdf2.hash_pwd_salt(&1))
+
+      user =
+        insert(:user,
+          multi_factor_authentication_settings: %MFA.Settings{
+            enabled: true,
+            backup_codes: hashed_codes,
+            totp: %MFA.Settings.TOTP{secret: otp_secret, confirmed: true}
+          }
+        )
+
+      mfa_token =
+        insert(:mfa_token,
+          user: user,
+          authorization: build(:oauth_authorization, app: app, scopes: ["write"])
+        )
+
+      response =
+        conn
+        |> post("/oauth/mfa/challenge", %{
+          "mfa_token" => mfa_token.token,
+          "challenge_type" => "recovery",
+          "code" => code,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+        |> json_response(:ok)
+
+      ap_id = user.ap_id
+
+      assert match?(
+               %{
+                 "access_token" => _,
+                 "me" => ^ap_id,
+                 "refresh_token" => _,
+                 "scope" => "write",
+                 "token_type" => "Bearer"
+               },
+               response
+             )
+
+      error_response =
+        conn
+        |> post("/oauth/mfa/challenge", %{
+          "mfa_token" => mfa_token.token,
+          "challenge_type" => "recovery",
+          "code" => code,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+        |> json_response(400)
+
+      assert error_response == %{"error" => "Invalid code"}
+    end
+  end
+end
diff --git a/test/pleroma/web/o_auth/o_auth_controller_test.exs b/test/pleroma/web/o_auth/o_auth_controller_test.exs
new file mode 100644
index 000000000..0fdd5b8e9
--- /dev/null
+++ b/test/pleroma/web/o_auth/o_auth_controller_test.exs
@@ -0,0 +1,1307 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.OAuth.OAuthControllerTest do
+  use Pleroma.Web.ConnCase
+
+  import Pleroma.Factory
+
+  alias Pleroma.Helpers.AuthHelper
+  alias Pleroma.MFA
+  alias Pleroma.MFA.TOTP
+  alias Pleroma.Repo
+  alias Pleroma.User
+  alias Pleroma.Web.OAuth.Authorization
+  alias Pleroma.Web.OAuth.OAuthController
+  alias Pleroma.Web.OAuth.Token
+
+  @session_opts [
+    store: :cookie,
+    key: "_test",
+    signing_salt: "cooldude"
+  ]
+  setup do
+    clear_config([:instance, :account_activation_required])
+    clear_config([:instance, :account_approval_required])
+  end
+
+  describe "in OAuth consumer mode, " do
+    setup do
+      [
+        app: insert(:oauth_app),
+        conn:
+          build_conn()
+          |> Plug.Session.call(Plug.Session.init(@session_opts))
+          |> fetch_session()
+      ]
+    end
+
+    setup do: clear_config([:auth, :oauth_consumer_strategies], ~w(twitter facebook))
+
+    test "GET /oauth/authorize renders auth forms, including OAuth consumer form", %{
+      app: app,
+      conn: conn
+    } do
+      conn =
+        get(
+          conn,
+          "/oauth/authorize",
+          %{
+            "response_type" => "code",
+            "client_id" => app.client_id,
+            "redirect_uri" => OAuthController.default_redirect_uri(app),
+            "scope" => "read"
+          }
+        )
+
+      assert response = html_response(conn, 200)
+      assert response =~ "Sign in with Twitter"
+      assert response =~ o_auth_path(conn, :prepare_request)
+    end
+
+    test "GET /oauth/prepare_request encodes parameters as `state` and redirects", %{
+      app: app,
+      conn: conn
+    } do
+      conn =
+        get(
+          conn,
+          "/oauth/prepare_request",
+          %{
+            "provider" => "twitter",
+            "authorization" => %{
+              "scope" => "read follow",
+              "client_id" => app.client_id,
+              "redirect_uri" => OAuthController.default_redirect_uri(app),
+              "state" => "a_state"
+            }
+          }
+        )
+
+      assert html_response(conn, 302)
+
+      redirect_query = URI.parse(redirected_to(conn)).query
+      assert %{"state" => state_param} = URI.decode_query(redirect_query)
+      assert {:ok, state_components} = Jason.decode(state_param)
+
+      expected_client_id = app.client_id
+      expected_redirect_uri = app.redirect_uris
+
+      assert %{
+               "scope" => "read follow",
+               "client_id" => ^expected_client_id,
+               "redirect_uri" => ^expected_redirect_uri,
+               "state" => "a_state"
+             } = state_components
+    end
+
+    test "with user-bound registration, GET /oauth/<provider>/callback redirects to `redirect_uri` with `code`",
+         %{app: app, conn: conn} do
+      registration = insert(:registration)
+      redirect_uri = OAuthController.default_redirect_uri(app)
+
+      state_params = %{
+        "scope" => Enum.join(app.scopes, " "),
+        "client_id" => app.client_id,
+        "redirect_uri" => redirect_uri,
+        "state" => ""
+      }
+
+      conn =
+        conn
+        |> assign(:ueberauth_auth, %{provider: registration.provider, uid: registration.uid})
+        |> get(
+          "/oauth/twitter/callback",
+          %{
+            "oauth_token" => "G-5a3AAAAAAAwMH9AAABaektfSM",
+            "oauth_verifier" => "QZl8vUqNvXMTKpdmUnGejJxuHG75WWWs",
+            "provider" => "twitter",
+            "state" => Jason.encode!(state_params)
+          }
+        )
+
+      assert html_response(conn, 302)
+      assert redirected_to(conn) =~ ~r/#{redirect_uri}\?code=.+/
+    end
+
+    test "with user-unbound registration, GET /oauth/<provider>/callback renders registration_details page",
+         %{app: app, conn: conn} do
+      user = insert(:user)
+
+      state_params = %{
+        "scope" => "read write",
+        "client_id" => app.client_id,
+        "redirect_uri" => OAuthController.default_redirect_uri(app),
+        "state" => "a_state"
+      }
+
+      conn =
+        conn
+        |> assign(:ueberauth_auth, %{
+          provider: "twitter",
+          uid: "171799000",
+          info: %{nickname: user.nickname, email: user.email, name: user.name, description: nil}
+        })
+        |> get(
+          "/oauth/twitter/callback",
+          %{
+            "oauth_token" => "G-5a3AAAAAAAwMH9AAABaektfSM",
+            "oauth_verifier" => "QZl8vUqNvXMTKpdmUnGejJxuHG75WWWs",
+            "provider" => "twitter",
+            "state" => Jason.encode!(state_params)
+          }
+        )
+
+      assert response = html_response(conn, 200)
+      assert response =~ ~r/name="op" type="submit" value="register"/
+      assert response =~ ~r/name="op" type="submit" value="connect"/
+      assert response =~ user.email
+      assert response =~ user.nickname
+    end
+
+    test "on authentication error, GET /oauth/<provider>/callback redirects to `redirect_uri`", %{
+      app: app,
+      conn: conn
+    } do
+      state_params = %{
+        "scope" => Enum.join(app.scopes, " "),
+        "client_id" => app.client_id,
+        "redirect_uri" => OAuthController.default_redirect_uri(app),
+        "state" => ""
+      }
+
+      conn =
+        conn
+        |> assign(:ueberauth_failure, %{errors: [%{message: "(error description)"}]})
+        |> get(
+          "/oauth/twitter/callback",
+          %{
+            "oauth_token" => "G-5a3AAAAAAAwMH9AAABaektfSM",
+            "oauth_verifier" => "QZl8vUqNvXMTKpdmUnGejJxuHG75WWWs",
+            "provider" => "twitter",
+            "state" => Jason.encode!(state_params)
+          }
+        )
+
+      assert html_response(conn, 302)
+      assert redirected_to(conn) == app.redirect_uris
+      assert get_flash(conn, :error) == "Failed to authenticate: (error description)."
+    end
+
+    test "GET /oauth/registration_details renders registration details form", %{
+      app: app,
+      conn: conn
+    } do
+      conn =
+        get(
+          conn,
+          "/oauth/registration_details",
+          %{
+            "authorization" => %{
+              "scopes" => app.scopes,
+              "client_id" => app.client_id,
+              "redirect_uri" => OAuthController.default_redirect_uri(app),
+              "state" => "a_state",
+              "nickname" => nil,
+              "email" => "john@doe.com"
+            }
+          }
+        )
+
+      assert response = html_response(conn, 200)
+      assert response =~ ~r/name="op" type="submit" value="register"/
+      assert response =~ ~r/name="op" type="submit" value="connect"/
+    end
+
+    test "with valid params, POST /oauth/register?op=register redirects to `redirect_uri` with `code`",
+         %{
+           app: app,
+           conn: conn
+         } do
+      registration = insert(:registration, user: nil, info: %{"nickname" => nil, "email" => nil})
+      redirect_uri = OAuthController.default_redirect_uri(app)
+
+      conn =
+        conn
+        |> put_session(:registration_id, registration.id)
+        |> post(
+          "/oauth/register",
+          %{
+            "op" => "register",
+            "authorization" => %{
+              "scopes" => app.scopes,
+              "client_id" => app.client_id,
+              "redirect_uri" => redirect_uri,
+              "state" => "a_state",
+              "nickname" => "availablenick",
+              "email" => "available@email.com"
+            }
+          }
+        )
+
+      assert html_response(conn, 302)
+      assert redirected_to(conn) =~ ~r/#{redirect_uri}\?code=.+/
+    end
+
+    test "with unlisted `redirect_uri`, POST /oauth/register?op=register results in HTTP 401",
+         %{
+           app: app,
+           conn: conn
+         } do
+      registration = insert(:registration, user: nil, info: %{"nickname" => nil, "email" => nil})
+      unlisted_redirect_uri = "http://cross-site-request.com"
+
+      conn =
+        conn
+        |> put_session(:registration_id, registration.id)
+        |> post(
+          "/oauth/register",
+          %{
+            "op" => "register",
+            "authorization" => %{
+              "scopes" => app.scopes,
+              "client_id" => app.client_id,
+              "redirect_uri" => unlisted_redirect_uri,
+              "state" => "a_state",
+              "nickname" => "availablenick",
+              "email" => "available@email.com"
+            }
+          }
+        )
+
+      assert html_response(conn, 401)
+    end
+
+    test "with invalid params, POST /oauth/register?op=register renders registration_details page",
+         %{
+           app: app,
+           conn: conn
+         } do
+      another_user = insert(:user)
+      registration = insert(:registration, user: nil, info: %{"nickname" => nil, "email" => nil})
+
+      params = %{
+        "op" => "register",
+        "authorization" => %{
+          "scopes" => app.scopes,
+          "client_id" => app.client_id,
+          "redirect_uri" => OAuthController.default_redirect_uri(app),
+          "state" => "a_state",
+          "nickname" => "availablenickname",
+          "email" => "available@email.com"
+        }
+      }
+
+      for {bad_param, bad_param_value} <-
+            [{"nickname", another_user.nickname}, {"email", another_user.email}] do
+        bad_registration_attrs = %{
+          "authorization" => Map.put(params["authorization"], bad_param, bad_param_value)
+        }
+
+        bad_params = Map.merge(params, bad_registration_attrs)
+
+        conn =
+          conn
+          |> put_session(:registration_id, registration.id)
+          |> post("/oauth/register", bad_params)
+
+        assert html_response(conn, 403) =~ ~r/name="op" type="submit" value="register"/
+        assert get_flash(conn, :error) == "Error: #{bad_param} has already been taken."
+      end
+    end
+
+    test "with valid params, POST /oauth/register?op=connect redirects to `redirect_uri` with `code`",
+         %{
+           app: app,
+           conn: conn
+         } do
+      user = insert(:user, password_hash: Pleroma.Password.Pbkdf2.hash_pwd_salt("testpassword"))
+      registration = insert(:registration, user: nil)
+      redirect_uri = OAuthController.default_redirect_uri(app)
+
+      conn =
+        conn
+        |> put_session(:registration_id, registration.id)
+        |> post(
+          "/oauth/register",
+          %{
+            "op" => "connect",
+            "authorization" => %{
+              "scopes" => app.scopes,
+              "client_id" => app.client_id,
+              "redirect_uri" => redirect_uri,
+              "state" => "a_state",
+              "name" => user.nickname,
+              "password" => "testpassword"
+            }
+          }
+        )
+
+      assert html_response(conn, 302)
+      assert redirected_to(conn) =~ ~r/#{redirect_uri}\?code=.+/
+    end
+
+    test "with unlisted `redirect_uri`, POST /oauth/register?op=connect results in HTTP 401`",
+         %{
+           app: app,
+           conn: conn
+         } do
+      user = insert(:user, password_hash: Pleroma.Password.Pbkdf2.hash_pwd_salt("testpassword"))
+      registration = insert(:registration, user: nil)
+      unlisted_redirect_uri = "http://cross-site-request.com"
+
+      conn =
+        conn
+        |> put_session(:registration_id, registration.id)
+        |> post(
+          "/oauth/register",
+          %{
+            "op" => "connect",
+            "authorization" => %{
+              "scopes" => app.scopes,
+              "client_id" => app.client_id,
+              "redirect_uri" => unlisted_redirect_uri,
+              "state" => "a_state",
+              "name" => user.nickname,
+              "password" => "testpassword"
+            }
+          }
+        )
+
+      assert html_response(conn, 401)
+    end
+
+    test "with invalid params, POST /oauth/register?op=connect renders registration_details page",
+         %{
+           app: app,
+           conn: conn
+         } do
+      user = insert(:user)
+      registration = insert(:registration, user: nil)
+
+      params = %{
+        "op" => "connect",
+        "authorization" => %{
+          "scopes" => app.scopes,
+          "client_id" => app.client_id,
+          "redirect_uri" => OAuthController.default_redirect_uri(app),
+          "state" => "a_state",
+          "name" => user.nickname,
+          "password" => "wrong password"
+        }
+      }
+
+      conn =
+        conn
+        |> put_session(:registration_id, registration.id)
+        |> post("/oauth/register", params)
+
+      assert html_response(conn, 401) =~ ~r/name="op" type="submit" value="connect"/
+      assert get_flash(conn, :error) == "Invalid Username/Password"
+    end
+  end
+
+  describe "GET /oauth/authorize" do
+    setup do
+      [
+        app: insert(:oauth_app, redirect_uris: "https://redirect.url"),
+        conn:
+          build_conn()
+          |> Plug.Session.call(Plug.Session.init(@session_opts))
+          |> fetch_session()
+      ]
+    end
+
+    test "renders authentication page", %{app: app, conn: conn} do
+      conn =
+        get(
+          conn,
+          "/oauth/authorize",
+          %{
+            "response_type" => "code",
+            "client_id" => app.client_id,
+            "redirect_uri" => OAuthController.default_redirect_uri(app),
+            "scope" => "read"
+          }
+        )
+
+      assert html_response(conn, 200) =~ ~s(type="submit")
+    end
+
+    test "properly handles internal calls with `authorization`-wrapped params", %{
+      app: app,
+      conn: conn
+    } do
+      conn =
+        get(
+          conn,
+          "/oauth/authorize",
+          %{
+            "authorization" => %{
+              "response_type" => "code",
+              "client_id" => app.client_id,
+              "redirect_uri" => OAuthController.default_redirect_uri(app),
+              "scope" => "read"
+            }
+          }
+        )
+
+      assert html_response(conn, 200) =~ ~s(type="submit")
+    end
+
+    test "renders authentication page if user is already authenticated but `force_login` is tru-ish",
+         %{app: app, conn: conn} do
+      token = insert(:oauth_token, app: app)
+
+      conn =
+        conn
+        |> AuthHelper.put_session_token(token.token)
+        |> get(
+          "/oauth/authorize",
+          %{
+            "response_type" => "code",
+            "client_id" => app.client_id,
+            "redirect_uri" => OAuthController.default_redirect_uri(app),
+            "scope" => "read",
+            "force_login" => "true"
+          }
+        )
+
+      assert html_response(conn, 200) =~ ~s(type="submit")
+    end
+
+    test "renders authentication page if user is already authenticated but user request with another client",
+         %{
+           app: app,
+           conn: conn
+         } do
+      token = insert(:oauth_token, app: app)
+
+      conn =
+        conn
+        |> AuthHelper.put_session_token(token.token)
+        |> get(
+          "/oauth/authorize",
+          %{
+            "response_type" => "code",
+            "client_id" => "another_client_id",
+            "redirect_uri" => OAuthController.default_redirect_uri(app),
+            "scope" => "read"
+          }
+        )
+
+      assert html_response(conn, 200) =~ ~s(type="submit")
+    end
+
+    test "with existing authentication and non-OOB `redirect_uri`, redirects to app with `token` and `state` params",
+         %{
+           app: app,
+           conn: conn
+         } do
+      token = insert(:oauth_token, app: app)
+
+      conn =
+        conn
+        |> AuthHelper.put_session_token(token.token)
+        |> get(
+          "/oauth/authorize",
+          %{
+            "response_type" => "code",
+            "client_id" => app.client_id,
+            "redirect_uri" => OAuthController.default_redirect_uri(app),
+            "state" => "specific_client_state",
+            "scope" => "read"
+          }
+        )
+
+      assert URI.decode(redirected_to(conn)) ==
+               "https://redirect.url?access_token=#{token.token}&state=specific_client_state"
+    end
+
+    test "with existing authentication and unlisted non-OOB `redirect_uri`, redirects without credentials",
+         %{
+           app: app,
+           conn: conn
+         } do
+      unlisted_redirect_uri = "http://cross-site-request.com"
+      token = insert(:oauth_token, app: app)
+
+      conn =
+        conn
+        |> AuthHelper.put_session_token(token.token)
+        |> get(
+          "/oauth/authorize",
+          %{
+            "response_type" => "code",
+            "client_id" => app.client_id,
+            "redirect_uri" => unlisted_redirect_uri,
+            "state" => "specific_client_state",
+            "scope" => "read"
+          }
+        )
+
+      assert redirected_to(conn) == unlisted_redirect_uri
+    end
+
+    test "with existing authentication and OOB `redirect_uri`, redirects to app with `token` and `state` params",
+         %{
+           app: app,
+           conn: conn
+         } do
+      token = insert(:oauth_token, app: app)
+
+      conn =
+        conn
+        |> AuthHelper.put_session_token(token.token)
+        |> get(
+          "/oauth/authorize",
+          %{
+            "response_type" => "code",
+            "client_id" => app.client_id,
+            "redirect_uri" => "urn:ietf:wg:oauth:2.0:oob",
+            "scope" => "read"
+          }
+        )
+
+      assert html_response(conn, 200) =~ "Authorization exists"
+    end
+  end
+
+  describe "POST /oauth/authorize" do
+    test "redirects with oauth authorization, " <>
+           "granting requested app-supported scopes to both admin- and non-admin users" do
+      app_scopes = ["read", "write", "admin", "secret_scope"]
+      app = insert(:oauth_app, scopes: app_scopes)
+      redirect_uri = OAuthController.default_redirect_uri(app)
+
+      non_admin = insert(:user, is_admin: false)
+      admin = insert(:user, is_admin: true)
+      scopes_subset = ["read:subscope", "write", "admin"]
+
+      # In case scope param is missing, expecting _all_ app-supported scopes to be granted
+      for user <- [non_admin, admin],
+          {requested_scopes, expected_scopes} <-
+            %{scopes_subset => scopes_subset, nil: app_scopes} do
+        conn =
+          post(
+            build_conn(),
+            "/oauth/authorize",
+            %{
+              "authorization" => %{
+                "name" => user.nickname,
+                "password" => "test",
+                "client_id" => app.client_id,
+                "redirect_uri" => redirect_uri,
+                "scope" => requested_scopes,
+                "state" => "statepassed"
+              }
+            }
+          )
+
+        target = redirected_to(conn)
+        assert target =~ redirect_uri
+
+        query = URI.parse(target).query |> URI.query_decoder() |> Map.new()
+
+        assert %{"state" => "statepassed", "code" => code} = query
+        auth = Repo.get_by(Authorization, token: code)
+        assert auth
+        assert auth.scopes == expected_scopes
+      end
+    end
+
+    test "authorize from cookie" do
+      user = insert(:user)
+      app = insert(:oauth_app)
+      oauth_token = insert(:oauth_token, user: user, app: app)
+      redirect_uri = OAuthController.default_redirect_uri(app)
+
+      conn =
+        build_conn()
+        |> Plug.Session.call(Plug.Session.init(@session_opts))
+        |> fetch_session()
+        |> AuthHelper.put_session_token(oauth_token.token)
+        |> post(
+          "/oauth/authorize",
+          %{
+            "authorization" => %{
+              "name" => user.nickname,
+              "client_id" => app.client_id,
+              "redirect_uri" => redirect_uri,
+              "scope" => app.scopes,
+              "state" => "statepassed"
+            }
+          }
+        )
+
+      target = redirected_to(conn)
+      assert target =~ redirect_uri
+
+      query = URI.parse(target).query |> URI.query_decoder() |> Map.new()
+
+      assert %{"state" => "statepassed", "code" => code} = query
+      auth = Repo.get_by(Authorization, token: code)
+      assert auth
+      assert auth.scopes == app.scopes
+    end
+
+    test "redirect to on two-factor auth page" do
+      otp_secret = TOTP.generate_secret()
+
+      user =
+        insert(:user,
+          multi_factor_authentication_settings: %MFA.Settings{
+            enabled: true,
+            totp: %MFA.Settings.TOTP{secret: otp_secret, confirmed: true}
+          }
+        )
+
+      app = insert(:oauth_app, scopes: ["read", "write", "follow"])
+
+      conn =
+        build_conn()
+        |> post("/oauth/authorize", %{
+          "authorization" => %{
+            "name" => user.nickname,
+            "password" => "test",
+            "client_id" => app.client_id,
+            "redirect_uri" => app.redirect_uris,
+            "scope" => "read write",
+            "state" => "statepassed"
+          }
+        })
+
+      result = html_response(conn, 200)
+
+      mfa_token = Repo.get_by(MFA.Token, user_id: user.id)
+      assert result =~ app.redirect_uris
+      assert result =~ "statepassed"
+      assert result =~ mfa_token.token
+      assert result =~ "Two-factor authentication"
+    end
+
+    test "returns 401 for wrong credentials", %{conn: conn} do
+      user = insert(:user)
+      app = insert(:oauth_app)
+      redirect_uri = OAuthController.default_redirect_uri(app)
+
+      result =
+        conn
+        |> post("/oauth/authorize", %{
+          "authorization" => %{
+            "name" => user.nickname,
+            "password" => "wrong",
+            "client_id" => app.client_id,
+            "redirect_uri" => redirect_uri,
+            "state" => "statepassed",
+            "scope" => Enum.join(app.scopes, " ")
+          }
+        })
+        |> html_response(:unauthorized)
+
+      # Keep the details
+      assert result =~ app.client_id
+      assert result =~ redirect_uri
+
+      # Error message
+      assert result =~ "Invalid Username/Password"
+    end
+
+    test "returns 401 for missing scopes" do
+      user = insert(:user, is_admin: false)
+      app = insert(:oauth_app, scopes: ["read", "write", "admin"])
+      redirect_uri = OAuthController.default_redirect_uri(app)
+
+      result =
+        build_conn()
+        |> post("/oauth/authorize", %{
+          "authorization" => %{
+            "name" => user.nickname,
+            "password" => "test",
+            "client_id" => app.client_id,
+            "redirect_uri" => redirect_uri,
+            "state" => "statepassed",
+            "scope" => ""
+          }
+        })
+        |> html_response(:unauthorized)
+
+      # Keep the details
+      assert result =~ app.client_id
+      assert result =~ redirect_uri
+
+      # Error message
+      assert result =~ "This action is outside the authorized scopes"
+    end
+
+    test "returns 401 for scopes beyond app scopes hierarchy", %{conn: conn} do
+      user = insert(:user)
+      app = insert(:oauth_app, scopes: ["read", "write"])
+      redirect_uri = OAuthController.default_redirect_uri(app)
+
+      result =
+        conn
+        |> post("/oauth/authorize", %{
+          "authorization" => %{
+            "name" => user.nickname,
+            "password" => "test",
+            "client_id" => app.client_id,
+            "redirect_uri" => redirect_uri,
+            "state" => "statepassed",
+            "scope" => "read write follow"
+          }
+        })
+        |> html_response(:unauthorized)
+
+      # Keep the details
+      assert result =~ app.client_id
+      assert result =~ redirect_uri
+
+      # Error message
+      assert result =~ "This action is outside the authorized scopes"
+    end
+  end
+
+  describe "POST /oauth/token" do
+    test "issues a token for an all-body request" do
+      user = insert(:user)
+      app = insert(:oauth_app, scopes: ["read", "write"])
+
+      {:ok, auth} = Authorization.create_authorization(app, user, ["write"])
+
+      conn =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "authorization_code",
+          "code" => auth.token,
+          "redirect_uri" => OAuthController.default_redirect_uri(app),
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+
+      assert %{"access_token" => token, "me" => ap_id} = json_response(conn, 200)
+
+      token = Repo.get_by(Token, token: token)
+      assert token
+      assert token.scopes == auth.scopes
+      assert user.ap_id == ap_id
+    end
+
+    test "issues a token for `password` grant_type with valid credentials, with full permissions by default" do
+      password = "testpassword"
+      user = insert(:user, password_hash: Pleroma.Password.Pbkdf2.hash_pwd_salt(password))
+
+      app = insert(:oauth_app, scopes: ["read", "write"])
+
+      # Note: "scope" param is intentionally omitted
+      conn =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "password",
+          "username" => user.nickname,
+          "password" => password,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+
+      assert %{"id" => id, "access_token" => access_token} = json_response(conn, 200)
+
+      token = Repo.get_by(Token, token: access_token)
+      assert token
+      assert token.id == id
+      assert token.token == access_token
+      assert token.scopes == app.scopes
+    end
+
+    test "issues a mfa token for `password` grant_type, when MFA enabled" do
+      password = "testpassword"
+      otp_secret = TOTP.generate_secret()
+
+      user =
+        insert(:user,
+          password_hash: Pleroma.Password.Pbkdf2.hash_pwd_salt(password),
+          multi_factor_authentication_settings: %MFA.Settings{
+            enabled: true,
+            totp: %MFA.Settings.TOTP{secret: otp_secret, confirmed: true}
+          }
+        )
+
+      app = insert(:oauth_app, scopes: ["read", "write"])
+
+      response =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "password",
+          "username" => user.nickname,
+          "password" => password,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+        |> json_response(403)
+
+      assert match?(
+               %{
+                 "supported_challenge_types" => "totp",
+                 "mfa_token" => _,
+                 "error" => "mfa_required"
+               },
+               response
+             )
+
+      token = Repo.get_by(MFA.Token, token: response["mfa_token"])
+      assert token.user_id == user.id
+      assert token.authorization_id
+    end
+
+    test "issues a token for request with HTTP basic auth client credentials" do
+      user = insert(:user)
+      app = insert(:oauth_app, scopes: ["scope1", "scope2", "scope3"])
+
+      {:ok, auth} = Authorization.create_authorization(app, user, ["scope1", "scope2"])
+      assert auth.scopes == ["scope1", "scope2"]
+
+      app_encoded =
+        (URI.encode_www_form(app.client_id) <> ":" <> URI.encode_www_form(app.client_secret))
+        |> Base.encode64()
+
+      conn =
+        build_conn()
+        |> put_req_header("authorization", "Basic " <> app_encoded)
+        |> post("/oauth/token", %{
+          "grant_type" => "authorization_code",
+          "code" => auth.token,
+          "redirect_uri" => OAuthController.default_redirect_uri(app)
+        })
+
+      assert %{"access_token" => token, "scope" => scope} = json_response(conn, 200)
+
+      assert scope == "scope1 scope2"
+
+      token = Repo.get_by(Token, token: token)
+      assert token
+      assert token.scopes == ["scope1", "scope2"]
+    end
+
+    test "issue a token for client_credentials grant type" do
+      app = insert(:oauth_app, scopes: ["read", "write"])
+
+      conn =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "client_credentials",
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+
+      assert %{"access_token" => token, "refresh_token" => refresh, "scope" => scope} =
+               json_response(conn, 200)
+
+      assert token
+      token_from_db = Repo.get_by(Token, token: token)
+      assert token_from_db
+      assert refresh
+      assert scope == "read write"
+    end
+
+    test "rejects token exchange with invalid client credentials" do
+      user = insert(:user)
+      app = insert(:oauth_app)
+
+      {:ok, auth} = Authorization.create_authorization(app, user)
+
+      conn =
+        build_conn()
+        |> put_req_header("authorization", "Basic JTIxOiVGMCU5RiVBNCVCNwo=")
+        |> post("/oauth/token", %{
+          "grant_type" => "authorization_code",
+          "code" => auth.token,
+          "redirect_uri" => OAuthController.default_redirect_uri(app)
+        })
+
+      assert resp = json_response(conn, 400)
+      assert %{"error" => _} = resp
+      refute Map.has_key?(resp, "access_token")
+    end
+
+    test "rejects token exchange for valid credentials belonging to unconfirmed user and confirmation is required" do
+      clear_config([:instance, :account_activation_required], true)
+      password = "testpassword"
+
+      {:ok, user} =
+        insert(:user, password_hash: Pleroma.Password.Pbkdf2.hash_pwd_salt(password))
+        |> User.confirmation_changeset(set_confirmation: false)
+        |> User.update_and_set_cache()
+
+      refute Pleroma.User.account_status(user) == :active
+
+      app = insert(:oauth_app)
+
+      conn =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "password",
+          "username" => user.nickname,
+          "password" => password,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+
+      assert resp = json_response(conn, 403)
+      assert %{"error" => _} = resp
+      refute Map.has_key?(resp, "access_token")
+    end
+
+    test "rejects token exchange for valid credentials belonging to deactivated user" do
+      password = "testpassword"
+
+      user =
+        insert(:user,
+          password_hash: Pleroma.Password.Pbkdf2.hash_pwd_salt(password),
+          is_active: false
+        )
+
+      app = insert(:oauth_app)
+
+      resp =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "password",
+          "username" => user.nickname,
+          "password" => password,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+        |> json_response(403)
+
+      assert resp == %{
+               "error" => "Your account is currently disabled",
+               "identifier" => "account_is_disabled"
+             }
+    end
+
+    test "rejects token exchange for user with password_reset_pending set to true" do
+      password = "testpassword"
+
+      user =
+        insert(:user,
+          password_hash: Pleroma.Password.Pbkdf2.hash_pwd_salt(password),
+          password_reset_pending: true
+        )
+
+      app = insert(:oauth_app, scopes: ["read", "write"])
+
+      resp =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "password",
+          "username" => user.nickname,
+          "password" => password,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+        |> json_response(403)
+
+      assert resp == %{
+               "error" => "Password reset is required",
+               "identifier" => "password_reset_required"
+             }
+    end
+
+    test "rejects token exchange for user with confirmation_pending set to true" do
+      clear_config([:instance, :account_activation_required], true)
+      password = "testpassword"
+
+      user =
+        insert(:user,
+          password_hash: Pleroma.Password.Pbkdf2.hash_pwd_salt(password),
+          is_confirmed: false
+        )
+
+      app = insert(:oauth_app, scopes: ["read", "write"])
+
+      resp =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "password",
+          "username" => user.nickname,
+          "password" => password,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+        |> json_response(403)
+
+      assert resp == %{
+               "error" => "Your login is missing a confirmed e-mail address",
+               "identifier" => "missing_confirmed_email"
+             }
+    end
+
+    test "rejects token exchange for valid credentials belonging to an unapproved user" do
+      password = "testpassword"
+
+      user =
+        insert(:user,
+          password_hash: Pleroma.Password.Pbkdf2.hash_pwd_salt(password),
+          is_approved: false
+        )
+
+      refute Pleroma.User.account_status(user) == :active
+
+      app = insert(:oauth_app)
+
+      conn =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "password",
+          "username" => user.nickname,
+          "password" => password,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+
+      assert resp = json_response(conn, 403)
+      assert %{"error" => _} = resp
+      refute Map.has_key?(resp, "access_token")
+    end
+
+    test "rejects an invalid authorization code" do
+      app = insert(:oauth_app)
+
+      conn =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "authorization_code",
+          "code" => "Imobviouslyinvalid",
+          "redirect_uri" => OAuthController.default_redirect_uri(app),
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+
+      assert resp = json_response(conn, 400)
+      assert %{"error" => _} = json_response(conn, 400)
+      refute Map.has_key?(resp, "access_token")
+    end
+  end
+
+  describe "POST /oauth/token - refresh token" do
+    setup do: clear_config([:oauth2, :issue_new_refresh_token])
+
+    test "issues a new access token with keep fresh token" do
+      clear_config([:oauth2, :issue_new_refresh_token], true)
+      user = insert(:user)
+      app = insert(:oauth_app, scopes: ["read", "write"])
+
+      {:ok, auth} = Authorization.create_authorization(app, user, ["write"])
+      {:ok, token} = Token.exchange_token(app, auth)
+
+      response =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "refresh_token",
+          "refresh_token" => token.refresh_token,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+        |> json_response(200)
+
+      ap_id = user.ap_id
+
+      assert match?(
+               %{
+                 "scope" => "write",
+                 "token_type" => "Bearer",
+                 "access_token" => _,
+                 "refresh_token" => _,
+                 "me" => ^ap_id
+               },
+               response
+             )
+
+      refute Repo.get_by(Token, token: token.token)
+      new_token = Repo.get_by(Token, token: response["access_token"])
+      assert new_token.refresh_token == token.refresh_token
+      assert new_token.scopes == auth.scopes
+      assert new_token.user_id == user.id
+      assert new_token.app_id == app.id
+    end
+
+    test "issues a new access token with new fresh token" do
+      clear_config([:oauth2, :issue_new_refresh_token], false)
+      user = insert(:user)
+      app = insert(:oauth_app, scopes: ["read", "write"])
+
+      {:ok, auth} = Authorization.create_authorization(app, user, ["write"])
+      {:ok, token} = Token.exchange_token(app, auth)
+
+      response =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "refresh_token",
+          "refresh_token" => token.refresh_token,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+        |> json_response(200)
+
+      ap_id = user.ap_id
+
+      assert match?(
+               %{
+                 "scope" => "write",
+                 "token_type" => "Bearer",
+                 "access_token" => _,
+                 "refresh_token" => _,
+                 "me" => ^ap_id
+               },
+               response
+             )
+
+      refute Repo.get_by(Token, token: token.token)
+      new_token = Repo.get_by(Token, token: response["access_token"])
+      refute new_token.refresh_token == token.refresh_token
+      assert new_token.scopes == auth.scopes
+      assert new_token.user_id == user.id
+      assert new_token.app_id == app.id
+    end
+
+    test "returns 400 if we try use access token" do
+      user = insert(:user)
+      app = insert(:oauth_app, scopes: ["read", "write"])
+
+      {:ok, auth} = Authorization.create_authorization(app, user, ["write"])
+      {:ok, token} = Token.exchange_token(app, auth)
+
+      response =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "refresh_token",
+          "refresh_token" => token.token,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+        |> json_response(400)
+
+      assert %{"error" => "Invalid credentials"} == response
+    end
+
+    test "returns 400 if refresh_token invalid" do
+      app = insert(:oauth_app, scopes: ["read", "write"])
+
+      response =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "refresh_token",
+          "refresh_token" => "token.refresh_token",
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+        |> json_response(400)
+
+      assert %{"error" => "Invalid credentials"} == response
+    end
+
+    test "issues a new token if token expired" do
+      user = insert(:user)
+      app = insert(:oauth_app, scopes: ["read", "write"])
+
+      {:ok, auth} = Authorization.create_authorization(app, user, ["write"])
+      {:ok, token} = Token.exchange_token(app, auth)
+
+      change =
+        Ecto.Changeset.change(
+          token,
+          %{valid_until: NaiveDateTime.add(NaiveDateTime.utc_now(), -86_400 * 30)}
+        )
+
+      {:ok, access_token} = Repo.update(change)
+
+      response =
+        build_conn()
+        |> post("/oauth/token", %{
+          "grant_type" => "refresh_token",
+          "refresh_token" => access_token.refresh_token,
+          "client_id" => app.client_id,
+          "client_secret" => app.client_secret
+        })
+        |> json_response(200)
+
+      ap_id = user.ap_id
+
+      assert match?(
+               %{
+                 "scope" => "write",
+                 "token_type" => "Bearer",
+                 "access_token" => _,
+                 "refresh_token" => _,
+                 "me" => ^ap_id
+               },
+               response
+             )
+
+      refute Repo.get_by(Token, token: token.token)
+      token = Repo.get_by(Token, token: response["access_token"])
+      assert token
+      assert token.scopes == auth.scopes
+      assert token.user_id == user.id
+      assert token.app_id == app.id
+    end
+  end
+
+  describe "POST /oauth/token - bad request" do
+    test "returns 500" do
+      response =
+        build_conn()
+        |> post("/oauth/token", %{})
+        |> json_response(500)
+
+      assert %{"error" => "Bad request"} == response
+    end
+  end
+
+  describe "POST /oauth/revoke" do
+    test "when authenticated with request token, revokes it and clears it from session" do
+      oauth_token = insert(:oauth_token)
+
+      conn =
+        build_conn()
+        |> Plug.Session.call(Plug.Session.init(@session_opts))
+        |> fetch_session()
+        |> AuthHelper.put_session_token(oauth_token.token)
+        |> post("/oauth/revoke", %{"token" => oauth_token.token})
+
+      assert json_response(conn, 200)
+
+      refute AuthHelper.get_session_token(conn)
+      assert Token.get_by_token(oauth_token.token) == {:error, :not_found}
+    end
+
+    test "if request is authenticated with a different token, " <>
+           "revokes requested token but keeps session token" do
+      user = insert(:user)
+      oauth_token = insert(:oauth_token, user: user)
+      other_app_oauth_token = insert(:oauth_token, user: user)
+
+      conn =
+        build_conn()
+        |> Plug.Session.call(Plug.Session.init(@session_opts))
+        |> fetch_session()
+        |> AuthHelper.put_session_token(oauth_token.token)
+        |> post("/oauth/revoke", %{"token" => other_app_oauth_token.token})
+
+      assert json_response(conn, 200)
+
+      assert AuthHelper.get_session_token(conn) == oauth_token.token
+      assert Token.get_by_token(other_app_oauth_token.token) == {:error, :not_found}
+    end
+
+    test "returns 500 on bad request" do
+      response =
+        build_conn()
+        |> post("/oauth/revoke", %{})
+        |> json_response(500)
+
+      assert %{"error" => "Bad request"} == response
+    end
+  end
+end
diff --git a/test/pleroma/web/o_auth/token/utils_test.exs b/test/pleroma/web/o_auth/token/utils_test.exs
new file mode 100644
index 000000000..d2e7a0904
--- /dev/null
+++ b/test/pleroma/web/o_auth/token/utils_test.exs
@@ -0,0 +1,53 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.OAuth.Token.UtilsTest do
+  use Pleroma.DataCase, async: true
+  alias Pleroma.Web.OAuth.Token.Utils
+  import Pleroma.Factory
+
+  describe "fetch_app/1" do
+    test "returns error when credentials is invalid" do
+      assert {:error, :not_found} =
+               Utils.fetch_app(%Plug.Conn{params: %{"client_id" => 1, "client_secret" => "x"}})
+    end
+
+    test "returns App by params credentails" do
+      app = insert(:oauth_app)
+
+      assert {:ok, load_app} =
+               Utils.fetch_app(%Plug.Conn{
+                 params: %{"client_id" => app.client_id, "client_secret" => app.client_secret}
+               })
+
+      assert load_app == app
+    end
+
+    test "returns App by header credentails" do
+      app = insert(:oauth_app)
+      header = "Basic " <> Base.encode64("#{app.client_id}:#{app.client_secret}")
+
+      conn =
+        %Plug.Conn{}
+        |> Plug.Conn.put_req_header("authorization", header)
+
+      assert {:ok, load_app} = Utils.fetch_app(conn)
+      assert load_app == app
+    end
+  end
+
+  describe "format_created_at/1" do
+    test "returns formatted created at" do
+      token = insert(:oauth_token)
+      date = Utils.format_created_at(token)
+
+      token_date =
+        token.inserted_at
+        |> DateTime.from_naive!("Etc/UTC")
+        |> DateTime.to_unix()
+
+      assert token_date == date
+    end
+  end
+end
diff --git a/test/pleroma/web/o_auth/token_test.exs b/test/pleroma/web/o_auth/token_test.exs
new file mode 100644
index 000000000..8c0858ebc
--- /dev/null
+++ b/test/pleroma/web/o_auth/token_test.exs
@@ -0,0 +1,72 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.OAuth.TokenTest do
+  use Pleroma.DataCase, async: true
+  alias Pleroma.Repo
+  alias Pleroma.Web.OAuth.App
+  alias Pleroma.Web.OAuth.Authorization
+  alias Pleroma.Web.OAuth.Token
+
+  import Pleroma.Factory
+
+  test "exchanges a auth token for an access token, preserving `scopes`" do
+    {:ok, app} =
+      Repo.insert(
+        App.register_changeset(%App{}, %{
+          client_name: "client",
+          scopes: ["read", "write"],
+          redirect_uris: "url"
+        })
+      )
+
+    user = insert(:user)
+
+    {:ok, auth} = Authorization.create_authorization(app, user, ["read"])
+    assert auth.scopes == ["read"]
+
+    {:ok, token} = Token.exchange_token(app, auth)
+
+    assert token.app_id == app.id
+    assert token.user_id == user.id
+    assert token.scopes == auth.scopes
+    assert String.length(token.token) > 10
+    assert String.length(token.refresh_token) > 10
+
+    auth = Repo.get(Authorization, auth.id)
+    {:error, "already used"} = Token.exchange_token(app, auth)
+  end
+
+  test "deletes all tokens of a user" do
+    {:ok, app1} =
+      Repo.insert(
+        App.register_changeset(%App{}, %{
+          client_name: "client1",
+          scopes: ["scope"],
+          redirect_uris: "url"
+        })
+      )
+
+    {:ok, app2} =
+      Repo.insert(
+        App.register_changeset(%App{}, %{
+          client_name: "client2",
+          scopes: ["scope"],
+          redirect_uris: "url"
+        })
+      )
+
+    user = insert(:user)
+
+    {:ok, auth1} = Authorization.create_authorization(app1, user)
+    {:ok, auth2} = Authorization.create_authorization(app2, user)
+
+    {:ok, _token1} = Token.exchange_token(app1, auth1)
+    {:ok, _token2} = Token.exchange_token(app2, auth2)
+
+    {tokens, _} = Token.delete_user_tokens(user)
+
+    assert tokens == 2
+  end
+end