[release-19.09] port new Mailman & Postorius & Hyperkitty NixOS module from master

[peti]

Merged to master in #67951.

A simple Apache configuration for running Postorious and Hyperkitty looks as follows:

httpd = let webRoot = config.services.mailman.webRoot; in {
  enable = true;
  adminAddr = "postmaster@example.org";
  hostName = "lists.example.org";
  logPerVirtualHost = true;
  extraModules = [ { name = "wsgi"; path = "${pkgs.apacheHttpdPackages.mod_wsgi3}/modules/mod_wsgi.so"; } ];
  extraConfig = ''                                                                                                                                                                                                  
    WSGISocketPrefix /run/httpd/wsgi                                                                                                                                                                                
    WSGIDaemonProcess mailman threads=25 home=/var/lib/mailman-web python-path=${webRoot}:${
      lib.makeSearchPath pkgs.python3.sitePackages
        pkgs.python3Packages.mailman-web.requiredPythonModules
    }                                                                       
  '';
  virtualHosts = [
    { hostName = "lists.example.org";
      documentRoot = config.security.acme.certs."lists.example.org".webroot;
      extraConfig = ''                                                                                                                                                                                              
        <Directory "${config.security.acme.certs."lists.example.org".webroot}">                                                                                                                                     
          Options -Indexes                                                                                                                                                                                          
        </Directory>                                                                                                                                                                                                
        RedirectMatch permanent ^(?!/\.well-known/acme-challenge/).* https://lists.example.org$0                                                                                                                    
                                                                                                                                                                                                                    
      '';
    }
    { hostName = "lists.example.org";
      enableSSL = true;
      sslServerCert = "/var/lib/acme/lists.example.org/fullchain.pem";
      sslServerKey = "/var/lib/acme/lists.example.org/key.pem";
      servedDirs = [ { dir = "/var/lib/mailman-web/static"; urlPath = "/static"; } ];
      extraConfig = ''                                                                                                                                                                                              
        <Directory "${webRoot}">                                                                                                                                                                                    
          <Files wsgi.py>                                                                                                                                                                                           
            Require all granted                                                                                                                                                                                     
          </Files>                                                                                                                                                                                                  
          WSGIProcessGroup mailman                                                                                                                                                                                  
        </Directory>                                                                                                                                                                                                
        WSGIScriptAlias / ${webRoot}/wsgi.py                                                                                                                                                                        
      '';
    }
    { hostName = "localhost";
      servedDirs = [ { dir = "/var/lib/postorius/static"; urlPath = "/static"; } ];
      extraConfig = ''                                                                                                                                                                                              
        <Directory "${webRoot}">                                                                                                                                                                                    
          <Files wsgi.py>                                                                                                                                                                                           
            Require ip 127.0.0.1                                                                                                                                                                                    
            Require all granted                                                                                                                                                                                     
          </Files>                                                                                                                                                                                                  
          WSGIProcessGroup mailman                                                                                                                                                                                  
        </Directory>                                                                                                                                                                                                
        WSGIScriptAlias / ${webRoot}/wsgi.py                                                                                                                                                                        
      '';
    }
  ];
};