krebs 3 modules: bepasty-server is a krebs module

1 files changed, 164 insertions, 0 deletions

diff --git a/krebs/3modules/bepasty-server.nix b/krebs/3modules/bepasty-server.nix
new file mode 100644
index 00000000..ff32eea6
--- /dev/null
+++ b/krebs/3modules/bepasty-server.nix
@@ -0,0 +1,164 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+let
+  gunicorn = pkgs.pythonPackages.gunicorn;
+  bepasty = pkgs.pythonPackages.bepasty-server;
+  gevent = pkgs.pythonPackages.gevent;
+  python = pkgs.pythonPackages.python;
+  cfg = config.krebs.bepasty;
+
+  out = {
+    options.krebs.bepasty = api;
+    config = mkIf cfg.enable (mkMerge [(mkIf cfg.serveNginx nginx-imp) imp ]) ;
+  };
+
+  api = {
+    enable = mkEnableOption "Bepasty Servers";
+    serveNginx = mkEnableOption "Serve Bepasty Servers with Nginx";
+
+    servers = mkOption {
+      type = with types; attrsOf optionSet;
+      options = singleton {
+        nginx = mkOption {
+          # TODO use the correct type
+          type = with types; attrsOf unspecified;
+          description = ''
+            additional nginx configuration. see krebs.nginx for all options
+          '' ;
+        };
+
+        secretKey = mkOption {
+          type = types.str;
+          description = ''
+            server secret for safe session cookies, must be set.
+          '';
+          default = "";
+        };
+
+        # we create a wsgi socket in $workDir/gunicorn-${name}.wsgi
+        workDir = mkOption {
+          type = types.str;
+          description = ''
+            Path to the working directory (used for sockets and pidfile).
+            Defaults to the users home directory. Must be accessible to nginx,
+            permissions will be set to 755
+          '';
+          default = config.users.extraUsers.bepasty.home;
+        };
+
+        dataDir = mkOption {
+          type = types.str;
+          description = ''
+            Defaults to the new users home dir which defaults to
+            /var/lib/bepasty-server/data
+            '';
+          default = "${config.users.extraUsers.bepasty.home}/data";
+        };
+
+        extraConfig = mkOption {
+          type = types.str;
+          default = "";
+          # TODO configure permissions in separate
+          example = ''
+            PERMISSIONS = {
+              'myadminsecret': 'admin,list,create,read,delete',
+            }
+            MAX_ALLOWED_FILE_SIZE = 5 * 1000 * 1000
+            '';
+        };
+
+        defaultPermissions = mkOption {
+          # TODO: listOf str
+          type = types.str;
+          description = ''
+          default permissions for all unauthenticated users.
+          '';
+          example = "read,create,delete";
+          default = "read";
+        };
+
+      };
+      default = {};
+    };
+
+  };
+
+  imp = {
+    # Configures systemd services for each configured server
+    # environment.systemPackages = [ bepasty gunicorn gevent ];
+    systemd.services = mapAttrs' (name: server:
+      nameValuePair ("bepasty-server-${name}")
+        ({
+          description = "Bepasty Server ${name}";
+          wantedBy = [ "multi-user.target" ];
+          after = [ "network.target" ];
+          restartIfChanged = true;
+          environment = {
+            BEPASTY_CONFIG = "${server.workDir}/bepasty-${name}.conf";
+            PYTHONPATH= "${bepasty}/lib/${python.libPrefix}/site-packages:${gevent}/lib/${python.libPrefix}/site-packages";
+          };
+          serviceConfig = {
+            Type = "simple";
+            PrivateTmp = true;
+
+            ExecStartPre = assert server.secretKey != ""; pkgs.writeScript "bepasty-server.${name}-init" ''
+              #!/bin/sh
+              mkdir -p "${server.dataDir}" "${server.workDir}"
+              chown bepasty:bepasty "${server.workDir}" "${server.dataDir}"
+              cat > "${server.workDir}/bepasty-${name}.conf" <<EOF
+              SITENAME="${name}"
+              STORAGE_FILESYSTEM_DIRECTORY="${server.dataDir}"
+              SECRET_KEY="${server.secretKey}"
+              DEFAULT_PERMISSIONS="${server.defaultPermissions}"
+              ${server.extraConfig}
+              EOF
+            '';
+            ExecStart = ''${gunicorn}/bin/gunicorn bepasty.wsgi --name ${name} \
+              -u bepasty \
+              -g bepasty \
+              --workers 3 --log-level=info \
+              --bind=unix:${server.workDir}/gunicorn-${name}.sock \
+              --pid ${server.workDir}/gunicorn-${name}.pid \
+              -k gevent
+            '';
+          };
+        })
+    ) cfg.servers;
+
+    users.extraUsers.bepasty = {
+      uid = 2796546855; #genid bepasty
+      group = "bepasty";
+      home = "/var/lib/bepasty-server";
+    };
+    users.extraGroups.bepasty = {
+      gid = 2796546855; #genid bepasty
+    };
+  };
+
+  nginx-imp = {
+    assertions = [ { assertion = config.krebs.nginx.enable;
+                      message = "krebs.nginx.enable must be true"; }];
+
+    krebs.nginx.servers = mapAttrs' (name: server:
+      nameValuePair("bepasty-server-${name}")
+      (mkMerge [ server.nginx  {
+        extraConfig = ''
+          client_max_body_size 32M;
+          '';
+        locations = [
+          (nameValuePair ("/")
+          (''
+            proxy_set_header Host $http_host;
+            proxy_pass http://unix:${server.workDir}/gunicorn-${name}.sock;
+          ''))
+          (nameValuePair ("/static/")
+          (''
+            alias ${bepasty}/lib/${python.libPrefix}/site-packages/bepasty/static/;
+          ''))
+          ];
+      }])
+    ) cfg.servers ;
+  };
+in
+out