From a2360c9f56775f17a7dc08fdc03cd909acbe9cb4 Mon Sep 17 00:00:00 2001
From: Fugi <me@fugi.dev>
Date: Thu, 22 Jun 2023 00:05:52 +0200
Subject: [PATCH] Add gitea module

---
 flake.nix         |   1 +
 modules/gitea.nix | 116 ++++++++++++++++++++++++++++++++++++++++++++++
 modules/nginx.nix |   6 +++
 3 files changed, 123 insertions(+)
 create mode 100644 modules/gitea.nix

diff --git a/flake.nix b/flake.nix
index c486812..e4ef074 100755
--- a/flake.nix
+++ b/flake.nix
@@ -46,6 +46,7 @@
             ./modules/vaultwarden.nix
             ./modules/zsh.nix
             ./modules/course-management.nix
+            ./modules/gitea.nix
             {
               fsr.enable_office_bloat = false;
               fsr.domain = "staging.ifsr.de";
diff --git a/modules/gitea.nix b/modules/gitea.nix
new file mode 100644
index 0000000..0f5a21e
--- /dev/null
+++ b/modules/gitea.nix
@@ -0,0 +1,116 @@
+{ config, lib, pkgs, ... }:
+let
+  domain = "git.${config.fsr.domain}";
+  giteaUser = "git";
+in
+{
+  sops.secrets.gitea_ldap_search = {
+    key = "portunus/search-password";
+    owner = config.services.gitea.user;
+  };
+
+  users.users.${giteaUser} = {
+    isSystemUser = true;
+    home = config.services.gitea.stateDir;
+    group = giteaUser;
+    useDefaultShell = true;
+  };
+  users.groups.${giteaUser} = { };
+
+  services.gitea = {
+    enable = true;
+    package = pkgs.forgejo; # community fork
+    user = giteaUser;
+    group = giteaUser;
+    appName = "iFSR Git";
+    lfs.enable = true;
+
+    database = {
+      type = "postgres";
+      createDatabase = true;
+      user = giteaUser;
+    };
+
+    # TODO: enable periodic dumps of the DB and repos, maybe use this for backups?
+    # dump = { };
+
+    settings = {
+      server = {
+        PROTOCOL = "http+unix";
+        DOMAIN = domain;
+        SSH_DOMAIN = config.fsr.domain;
+        ROOT_URL = "https://${domain}";
+        OFFLINE_MODE = true; # disable use of CDNs
+      };
+      database.LOG_SQL = false;
+      service = {
+        DISABLE_REGISTRATION = true;
+        ENABLE_NOTIFY_MAIL = true;
+        NO_REPLY_ADDRESS = "noreply.${config.fsr.domain}";
+      };
+      "service.explore".DISABLE_USERS_PAGE = true;
+      openid = {
+        ENABLE_OPENID_SIGNIN = false;
+        ENABLE_OPENID_SIGNUP = false;
+      };
+      mailer = {
+        ENABLED = true;
+        FROM = "\"iFSR Git\" <git@${config.fsr.domain}>";
+        SMTP_ADDR = "localhost";
+        SMTP_PORT = 25;
+      };
+      session = {
+        COOKIE_SECURE = true;
+        PROVIDER = "db";
+      };
+    };
+  };
+
+  systemd.services.gitea.preStart =
+    let
+      exe = lib.getExe config.services.gitea.package;
+      portunus = config.services.portunus;
+      basedn = "ou=users,${portunus.ldap.suffix}";
+      ldapConfigArgs = ''
+        --name LDAP \
+        --active \
+        --security-protocol unencrypted \
+        --host '${portunus.domain}' \
+        --port 389 \
+        --user-search-base '${basedn}' \
+        --user-filter '(&(objectClass=posixAccount)(uid=%s))' \
+        --admin-filter '(isMemberOf=cn=admins,ou=groups,${portunus.ldap.suffix})' \
+        --username-attribute uid \
+        --firstname-attribute givenName \
+        --surname-attribute sn \
+        --email-attribute mail \
+        --public-ssh-key-attribute sshPublicKey \
+        --bind-dn 'uid=search,${basedn}' \
+        --bind-password "`cat ${config.sops.secrets.gitea_ldap_search.path}`" \
+        --synchronize-users
+      '';
+    in
+    lib.mkAfter /* sh */ ''
+      # Check if LDAP is already configured
+      ldap_line=$(${exe} admin auth list | grep "LDAP" | head -n 1)
+
+      if [[ -n "$ldap_line" ]]; then
+        # update ldap config
+        id=$(echo "$ldap_line" | ${pkgs.gawk}/bin/awk '{print $1}')
+        ${exe} admin auth update-ldap --id $id ${ldapConfigArgs}
+      else
+        # initially configure ldap
+        ${exe} admin auth add-ldap ${ldapConfigArgs}
+      fi
+    '';
+
+  services.nginx.virtualHosts.${domain} = {
+    enableACME = true;
+    forceSSL = true;
+    locations."/" = {
+      proxyPass = "http://unix:${config.services.gitea.settings.server.HTTP_ADDR}:/";
+      proxyWebsockets = true;
+    };
+    locations."/api/v1/users/search".return = "403";
+  };
+}
diff --git a/modules/nginx.nix b/modules/nginx.nix
index 5f5a79e..26d7380 100644
--- a/modules/nginx.nix
+++ b/modules/nginx.nix
@@ -2,10 +2,16 @@
 {
   services.nginx = {
     enable = true;
+    recommendedProxySettings = true;
+    recommendedGzipSettings = true;
+    recommendedOptimisation = true;
+    recommendedTlsSettings = true;
+
     virtualHosts."${config.fsr.domain}" = {
       enableACME = true;
       forceSSL = true;
     };
+
     appendHttpConfig = ''
       map $remote_addr $remote_addr_anon {
                ~(?P<ip>\d+\.\d+\.\d+)\.    $ip.0;