# This tests Keycloak: it starts the service, creates a realm with an
# OIDC client and a user, and simulates the user logging in to the
# client using their Keycloak login.

import ./make-test-python.nix (
  { pkgs, ... }:
  let
    frontendUrl = "http://keycloak/auth";
    initialAdminPassword = "h4IhoJFnt2iQIR9";
  in
    {
      name = "keycloak";
      meta = with pkgs.stdenv.lib.maintainers; {
        maintainers = [ talyz ];
      };

      nodes = {
        keycloak = { ... }: {
          virtualisation.memorySize = 1024;
          services.keycloak = {
            enable = true;
            inherit frontendUrl initialAdminPassword;
            databasePasswordFile = pkgs.writeText "dbPassword" "wzf6vOCbPp6cqTH";
          };
          environment.systemPackages = with pkgs; [
            xmlstarlet
            libtidy
            jq
          ];
        };
      };

      testScript =
        let
          client = {
            clientId = "test-client";
            name = "test-client";
            redirectUris = [ "urn:ietf:wg:oauth:2.0:oob" ];
          };

          user = {
            firstName = "Chuck";
            lastName = "Testa";
            username = "chuck.testa";
            email = "chuck.testa@example.com";
          };

          password = "password1234";

          realm = {
            enabled = true;
            realm = "test-realm";
            clients = [ client ];
            users = [(
              user // {
                enabled = true;
                credentials = [{
                  type = "password";
                  temporary = false;
                  value = password;
                }];
              }
            )];
          };

          realmDataJson = pkgs.writeText "realm-data.json" (builtins.toJSON realm);

          jqCheckUserinfo = pkgs.writeText "check-userinfo.jq" ''
            if {
              "firstName": .given_name,
              "lastName": .family_name,
              "username": .preferred_username,
              "email": .email
            } != ${builtins.toJSON user} then
              error("Wrong user info!")
            else
              empty
            end
          '';
        in ''
          keycloak.start()
          keycloak.wait_for_unit("keycloak.service")
          keycloak.wait_until_succeeds("curl -sSf ${frontendUrl}")


          ### Realm Setup ###

          # Get an admin interface access token
          keycloak.succeed(
              "curl -sSf -d 'client_id=admin-cli' -d 'username=admin' -d 'password=${initialAdminPassword}' -d 'grant_type=password' '${frontendUrl}/realms/master/protocol/openid-connect/token' | jq -r '\"Authorization: bearer \" + .access_token' >admin_auth_header"
          )

          # Publish the realm, including a test OIDC client and user
          keycloak.succeed(
              "curl -sSf -H @admin_auth_header -X POST -H 'Content-Type: application/json' -d @${realmDataJson} '${frontendUrl}/admin/realms/'"
          )

          # Generate and save the client secret. To do this we need
          # Keycloak's internal id for the client.
          keycloak.succeed(
              "curl -sSf -H @admin_auth_header '${frontendUrl}/admin/realms/${realm.realm}/clients?clientId=${client.name}' | jq -r '.[].id' >client_id",
              "curl -sSf -H @admin_auth_header -X POST '${frontendUrl}/admin/realms/${realm.realm}/clients/'$(<client_id)'/client-secret' | jq -r .value >client_secret",
          )


          ### Authentication Testing ###

          # Start the login process by sending an initial request to the
          # OIDC authentication endpoint, saving the returned page. Tidy
          # up the HTML (XmlStarlet is picky) and extract the login form
          # post url.
          keycloak.succeed(
              "curl -sSf -c cookie '${frontendUrl}/realms/${realm.realm}/protocol/openid-connect/auth?client_id=${client.name}&redirect_uri=urn%3Aietf%3Awg%3Aoauth%3A2.0%3Aoob&scope=openid+email&response_type=code&response_mode=query&nonce=qw4o89g3qqm' >login_form",
              "tidy -q -m login_form || true",
              "xml sel -T -t -m \"_:html/_:body/_:div/_:div/_:div/_:div/_:div/_:div/_:form[@id='kc-form-login']\" -v @action login_form >form_post_url",
          )

          # Post the login form and save the response. Once again tidy up
          # the HTML, then extract the authorization code.
          keycloak.succeed(
              "curl -sSf -L -b cookie -d 'username=${user.username}' -d 'password=${password}' -d 'credentialId=' \"$(<form_post_url)\" >auth_code_html",
              "tidy -q -m auth_code_html || true",
              "xml sel -T -t -m \"_:html/_:body/_:div/_:div/_:div/_:div/_:div/_:input[@id='code']\" -v @value auth_code_html >auth_code",
          )

          # Exchange the authorization code for an access token.
          keycloak.succeed(
              "curl -sSf -d grant_type=authorization_code -d code=$(<auth_code) -d client_id=${client.name} -d client_secret=$(<client_secret) -d redirect_uri=urn%3Aietf%3Awg%3Aoauth%3A2.0%3Aoob '${frontendUrl}/realms/${realm.realm}/protocol/openid-connect/token' | jq -r '\"Authorization: bearer \" + .access_token' >auth_header"
          )

          # Use the access token on the OIDC userinfo endpoint and check
          # that the returned user info matches what we initialized the
          # realm with.
          keycloak.succeed(
              "curl -sSf -H @auth_header '${frontendUrl}/realms/${realm.realm}/protocol/openid-connect/userinfo' | jq -f ${jqCheckUserinfo}"
          )
        '';
    }
)