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# This tests Discourse by:
#  1. logging in as the admin user
#  2. sending a private message to the admin user through the API
#  3. replying to that message via email.

{
  lib,
  package,
  pkgs,
  ...
}:
let
  certs = import ./common/acme/server/snakeoil-certs.nix;
  clientDomain = "client.fake.domain";
  discourseDomain = certs.domain;
  adminPassword = "eYAX85qmMJ5GZIHLaXGDAoszD7HSZp5d";
  secretKeyBase = "381f4ac6d8f5e49d804dae72aa9c046431d2f34c656a705c41cd52fed9b4f6f76f51549f0b55db3b8b0dded7a00d6a381ebe9a4367d2d44f5e743af6628b4d42";
  admin = {
    email = "alice@${clientDomain}";
    username = "alice";
    fullName = "Alice Admin";
    passwordFile = "${pkgs.writeText "admin-pass" adminPassword}";
  };
in
{
  name = "discourse-${package.version}";
  meta.maintainers = with lib.maintainers; [ talyz ];

  nodes.discourse =
    { nodes, ... }:
    {
      virtualisation.memorySize = 4096;
      virtualisation.cores = 4;
      virtualisation.useNixStoreImage = true;
      virtualisation.writableStore = false;

      imports = [ common/user-account.nix ];

      security.pki.certificateFiles = [
        certs.ca.cert
      ];

      networking.extraHosts = ''
        127.0.0.1 ${discourseDomain}
        ${nodes.client.networking.primaryIPAddress} ${clientDomain}
      '';

      services.postfix = {
        enableSubmission = true;
        enableSubmissions = true;
        submissionsOptions = {
          smtpd_sasl_auth_enable = "yes";
          smtpd_client_restrictions = "permit";
        };
      };

      environment.systemPackages = [ pkgs.jq ];

      services.postgresql.package = pkgs.postgresql_15;

      services.discourse = {
        enable = true;
        inherit admin package;
        hostname = discourseDomain;
        sslCertificate = "${certs.${discourseDomain}.cert}";
        sslCertificateKey = "${certs.${discourseDomain}.key}";
        secretKeyBaseFile = "${pkgs.writeText "secret-key-base" secretKeyBase}";
        enableACME = false;
        mail.outgoing.serverAddress = clientDomain;
        mail.incoming.enable = true;
        siteSettings = {
          posting = {
            min_post_length = 5;
            min_first_post_length = 5;
            min_personal_message_post_length = 5;
          };
        };
        unicornTimeout = 900;
      };

      networking.firewall.allowedTCPPorts = [
        25
        465
      ];
    };

  nodes.client =
    { config, nodes, ... }:
    {
      imports = [ common/user-account.nix ];

      security.pki.certificateFiles = [
        certs.ca.cert
      ];

      networking.extraHosts = ''
        127.0.0.1 ${clientDomain}
        ${nodes.discourse.networking.primaryIPAddress} ${discourseDomain}
      '';

      services.dovecot2 = {
        enable = true;
        enablePAM = true;
        settings = {
          dovecot_config_version = "2.4.3";
          dovecot_storage_version = config.services.dovecot2.package.version;
          protocols.imap = true;
          mail_driver = "maildir";
          mail_path = "${config.services.postfix.settings.main.mail_spool_directory}/%{user}";
        };
      };

      services.postfix = {
        enable = true;
        settings.main = {
          compatibility_level = "2";
          mydestination = [ clientDomain ];
          myhostname = clientDomain;
          origin = clientDomain;
          relay_domains = [ clientDomain ];
          smtpd_banner = "ESMTP server";
        };
      };

      environment.systemPackages =
        let
          replyToEmail =
            pkgs.writeScriptBin "reply-to-email"
              # python
              ''
                #!${pkgs.python3.interpreter}
                import imaplib
                import smtplib
                import ssl
                import email.header
                import sys
                from email import message_from_bytes
                from email.message import EmailMessage

                with imaplib.IMAP4('localhost') as imap:
                    imap.login('alice', 'foobar')
                    imap.select()
                    status, data = imap.search(None, 'ALL')
                    assert status == 'OK'

                    nums = data[0].split()
                    try:
                      assert len(nums) == 1
                    except AssertionError:
                      print("No mail in IMAP mailbox yet...", file=sys.stderr)
                      sys.exit(1)

                    status, msg_data = imap.fetch(nums[0], '(RFC822)')
                    assert status == 'OK'

                msg = email.message_from_bytes(msg_data[0][1])
                subject = str(email.header.make_header(email.header.decode_header(msg['Subject'])))
                reply_to = email.header.decode_header(msg['Reply-To'])[0][0]
                message_id = email.header.decode_header(msg['Message-ID'])[0][0]
                date = email.header.decode_header(msg['Date'])[0][0]

                ctx = ssl.create_default_context()
                with smtplib.SMTP_SSL(host='${discourseDomain}', context=ctx) as smtp:
                    reply = EmailMessage()
                    reply['Subject'] = 'Re: ' + subject
                    reply['To'] = reply_to
                    reply['From'] = 'alice@${clientDomain}'
                    reply['In-Reply-To'] = message_id
                    reply['References'] = message_id
                    reply['Date'] = date
                    reply.set_content("Test reply.")

                    smtp.send_message(reply)
                    smtp.quit()
              '';
        in
        [ replyToEmail ];

      networking.firewall.allowedTCPPorts = [ 25 ];
    };

  testScript =
    { nodes, ... }:
    let
      request = builtins.toJSON {
        title = "Private message";
        raw = "This is a test message.";
        target_recipients = admin.username;
        archetype = "private_message";
      };
    in
    ''
      discourse.start()
      client.start()

      discourse.wait_for_unit("discourse.service")
      discourse.wait_for_file("/run/discourse/sockets/unicorn.sock")
      discourse.wait_until_succeeds("curl -sS -f https://${discourseDomain}")
      discourse.succeed(
          "curl -sS -f https://${discourseDomain}/session/csrf -c cookie -b cookie -H 'Accept: application/json' | jq -r '\"X-CSRF-Token: \" + .csrf' > csrf_token",
          "curl -sS -f https://${discourseDomain}/session -c cookie -b cookie -H @csrf_token -H 'Accept: application/json' -d 'login=${nodes.discourse.services.discourse.admin.username}' -d \"password=${adminPassword}\" | jq -e '.user.username == \"${nodes.discourse.services.discourse.admin.username}\"'",
          "curl -sS -f https://${discourseDomain}/login -v -H 'Accept: application/json' -c cookie -b cookie 2>&1 | grep ${nodes.discourse.services.discourse.admin.username}",
      )

      client.wait_for_unit("postfix.service")
      client.wait_for_unit("dovecot.service")

      discourse.succeed(
          "sudo -u discourse discourse-rake api_key:create_master[master] >api_key",
          'curl -sS -f https://${discourseDomain}/posts -X POST -H "Content-Type: application/json" -H "Api-Key: $(<api_key)" -H "Api-Username: system" -d \'${request}\' ',
      )

      client.wait_until_succeeds("reply-to-email")

      discourse.wait_until_succeeds(
          'curl -sS -f https://${discourseDomain}/topics/private-messages/system -H "Accept: application/json" -H "Api-Key: $(<api_key)" -H "Api-Username: system" | jq -e \'if .topic_list.topics[0].id != null then .topic_list.topics[0].id else null end\' >topic_id'
      )
      discourse.succeed(
          'curl -sS -f https://${discourseDomain}/t/$(<topic_id) -H "Accept: application/json" -H "Api-Key: $(<api_key)" -H "Api-Username: system" | jq -e \'if .post_stream.posts[1].cooked == "<p>Test reply.</p>" then true else null end\' '
      )
    '';
}