diff --git a/.drone.yml b/.drone.yml
new file mode 100644
index 0000000..95b37fe
--- /dev/null
+++ b/.drone.yml
@@ -0,0 +1,22 @@
+kind: pipeline
+name: default
+type: docker
+
+trigger:
+ event:
+ - push
+ branch:
+ - main
+
+steps:
+ - name: build-simplekolecalc
+ image: plugins/docker
+ settings:
+ dockerfile: build/frontend/Dockerfile
+ repo: registry.wtf-eg.net/wtf/simplekolecalc
+ registry: registry.wtf-eg.net
+ username:
+ from_secret: "docker_username"
+ password:
+ from_secret: "docker_password"
+
diff --git a/build/frontend/Dockerfile b/build/frontend/Dockerfile
new file mode 100644
index 0000000..b13f521
--- /dev/null
+++ b/build/frontend/Dockerfile
@@ -0,0 +1,3 @@
+FROM httpd:2.4-alpine
+COPY ./kole.html /usr/local/apache2/htdocs/index.html
+COPY ./build/frontend/httpd.conf /usr/local/apache2/conf/httpd.conf
diff --git a/build/frontend/httpd.conf b/build/frontend/httpd.conf
new file mode 100644
index 0000000..69e770a
--- /dev/null
+++ b/build/frontend/httpd.conf
@@ -0,0 +1,556 @@
+#
+# This is the main Apache HTTP server configuration file. It contains the
+# configuration directives that give the server its instructions.
+# See for detailed information.
+# In particular, see
+#
+# for a discussion of each configuration directive.
+#
+# Do NOT simply read the instructions in here without understanding
+# what they do. They're here only as hints or reminders. If you are unsure
+# consult the online docs. You have been warned.
+#
+# Configuration and logfile names: If the filenames you specify for many
+# of the server's control files begin with "/" (or "drive:/" for Win32), the
+# server will use that explicit path. If the filenames do *not* begin
+# with "/", the value of ServerRoot is prepended -- so "logs/access_log"
+# with ServerRoot set to "/usr/local/apache2" will be interpreted by the
+# server as "/usr/local/apache2/logs/access_log", whereas "/logs/access_log"
+# will be interpreted as '/logs/access_log'.
+
+#
+# ServerRoot: The top of the directory tree under which the server's
+# configuration, error, and log files are kept.
+#
+# Do not add a slash at the end of the directory path. If you point
+# ServerRoot at a non-local disk, be sure to specify a local disk on the
+# Mutex directive, if file-based mutexes are used. If you wish to share the
+# same ServerRoot for multiple httpd daemons, you will need to change at
+# least PidFile.
+#
+ServerRoot "/usr/local/apache2"
+
+#
+# Mutex: Allows you to set the mutex mechanism and mutex file directory
+# for individual mutexes, or change the global defaults
+#
+# Uncomment and change the directory if mutexes are file-based and the default
+# mutex file directory is not on a local disk or is not appropriate for some
+# other reason.
+#
+# Mutex default:logs
+
+#
+# Listen: Allows you to bind Apache to specific IP addresses and/or
+# ports, instead of the default. See also the
+# directive.
+#
+# Change this to Listen on specific IP addresses as shown below to
+# prevent Apache from glomming onto all bound IP addresses.
+#
+#Listen 12.34.56.78:80
+Listen 80
+
+#
+# Dynamic Shared Object (DSO) Support
+#
+# To be able to use the functionality of a module which was built as a DSO you
+# have to place corresponding `LoadModule' lines at this location so the
+# directives contained in it are actually available _before_ they are used.
+# Statically compiled modules (those listed by `httpd -l') do not need
+# to be loaded here.
+#
+# Example:
+# LoadModule foo_module modules/mod_foo.so
+#
+LoadModule mpm_event_module modules/mod_mpm_event.so
+#LoadModule mpm_prefork_module modules/mod_mpm_prefork.so
+#LoadModule mpm_worker_module modules/mod_mpm_worker.so
+#LoadModule authn_file_module modules/mod_authn_file.so
+#LoadModule authn_dbm_module modules/mod_authn_dbm.so
+#LoadModule authn_anon_module modules/mod_authn_anon.so
+#LoadModule authn_dbd_module modules/mod_authn_dbd.so
+#LoadModule authn_socache_module modules/mod_authn_socache.so
+LoadModule authn_core_module modules/mod_authn_core.so
+LoadModule authz_host_module modules/mod_authz_host.so
+LoadModule authz_groupfile_module modules/mod_authz_groupfile.so
+LoadModule authz_user_module modules/mod_authz_user.so
+#LoadModule authz_dbm_module modules/mod_authz_dbm.so
+#LoadModule authz_owner_module modules/mod_authz_owner.so
+#LoadModule authz_dbd_module modules/mod_authz_dbd.so
+LoadModule authz_core_module modules/mod_authz_core.so
+LoadModule authnz_ldap_module modules/mod_authnz_ldap.so
+#LoadModule authnz_fcgi_module modules/mod_authnz_fcgi.so
+LoadModule access_compat_module modules/mod_access_compat.so
+LoadModule auth_basic_module modules/mod_auth_basic.so
+#LoadModule auth_form_module modules/mod_auth_form.so
+#LoadModule auth_digest_module modules/mod_auth_digest.so
+#LoadModule allowmethods_module modules/mod_allowmethods.so
+#LoadModule isapi_module modules/mod_isapi.so
+#LoadModule file_cache_module modules/mod_file_cache.so
+#LoadModule cache_module modules/mod_cache.so
+#LoadModule cache_disk_module modules/mod_cache_disk.so
+#LoadModule cache_socache_module modules/mod_cache_socache.so
+#LoadModule socache_shmcb_module modules/mod_socache_shmcb.so
+#LoadModule socache_dbm_module modules/mod_socache_dbm.so
+#LoadModule socache_memcache_module modules/mod_socache_memcache.so
+#LoadModule socache_redis_module modules/mod_socache_redis.so
+#LoadModule watchdog_module modules/mod_watchdog.so
+#LoadModule macro_module modules/mod_macro.so
+#LoadModule dbd_module modules/mod_dbd.so
+#LoadModule bucketeer_module modules/mod_bucketeer.so
+#LoadModule dumpio_module modules/mod_dumpio.so
+#LoadModule echo_module modules/mod_echo.so
+#LoadModule example_hooks_module modules/mod_example_hooks.so
+#LoadModule case_filter_module modules/mod_case_filter.so
+#LoadModule case_filter_in_module modules/mod_case_filter_in.so
+#LoadModule example_ipc_module modules/mod_example_ipc.so
+#LoadModule buffer_module modules/mod_buffer.so
+#LoadModule data_module modules/mod_data.so
+#LoadModule ratelimit_module modules/mod_ratelimit.so
+LoadModule reqtimeout_module modules/mod_reqtimeout.so
+#LoadModule ext_filter_module modules/mod_ext_filter.so
+#LoadModule request_module modules/mod_request.so
+#LoadModule include_module modules/mod_include.so
+LoadModule filter_module modules/mod_filter.so
+#LoadModule reflector_module modules/mod_reflector.so
+#LoadModule substitute_module modules/mod_substitute.so
+#LoadModule sed_module modules/mod_sed.so
+#LoadModule charset_lite_module modules/mod_charset_lite.so
+#LoadModule deflate_module modules/mod_deflate.so
+#LoadModule xml2enc_module modules/mod_xml2enc.so
+#LoadModule proxy_html_module modules/mod_proxy_html.so
+#LoadModule brotli_module modules/mod_brotli.so
+LoadModule mime_module modules/mod_mime.so
+LoadModule ldap_module modules/mod_ldap.so
+LoadModule log_config_module modules/mod_log_config.so
+#LoadModule log_debug_module modules/mod_log_debug.so
+#LoadModule log_forensic_module modules/mod_log_forensic.so
+#LoadModule logio_module modules/mod_logio.so
+#LoadModule lua_module modules/mod_lua.so
+LoadModule env_module modules/mod_env.so
+#LoadModule mime_magic_module modules/mod_mime_magic.so
+#LoadModule cern_meta_module modules/mod_cern_meta.so
+#LoadModule expires_module modules/mod_expires.so
+LoadModule headers_module modules/mod_headers.so
+#LoadModule ident_module modules/mod_ident.so
+#LoadModule usertrack_module modules/mod_usertrack.so
+#LoadModule unique_id_module modules/mod_unique_id.so
+LoadModule setenvif_module modules/mod_setenvif.so
+LoadModule version_module modules/mod_version.so
+#LoadModule remoteip_module modules/mod_remoteip.so
+#LoadModule proxy_module modules/mod_proxy.so
+#LoadModule proxy_connect_module modules/mod_proxy_connect.so
+#LoadModule proxy_ftp_module modules/mod_proxy_ftp.so
+#LoadModule proxy_http_module modules/mod_proxy_http.so
+#LoadModule proxy_fcgi_module modules/mod_proxy_fcgi.so
+#LoadModule proxy_scgi_module modules/mod_proxy_scgi.so
+#LoadModule proxy_uwsgi_module modules/mod_proxy_uwsgi.so
+#LoadModule proxy_fdpass_module modules/mod_proxy_fdpass.so
+#LoadModule proxy_wstunnel_module modules/mod_proxy_wstunnel.so
+#LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
+#LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
+#LoadModule proxy_express_module modules/mod_proxy_express.so
+#LoadModule proxy_hcheck_module modules/mod_proxy_hcheck.so
+#LoadModule session_module modules/mod_session.so
+#LoadModule session_cookie_module modules/mod_session_cookie.so
+#LoadModule session_crypto_module modules/mod_session_crypto.so
+#LoadModule session_dbd_module modules/mod_session_dbd.so
+#LoadModule slotmem_shm_module modules/mod_slotmem_shm.so
+#LoadModule slotmem_plain_module modules/mod_slotmem_plain.so
+#LoadModule ssl_module modules/mod_ssl.so
+#LoadModule optional_hook_export_module modules/mod_optional_hook_export.so
+#LoadModule optional_hook_import_module modules/mod_optional_hook_import.so
+#LoadModule optional_fn_import_module modules/mod_optional_fn_import.so
+#LoadModule optional_fn_export_module modules/mod_optional_fn_export.so
+#LoadModule dialup_module modules/mod_dialup.so
+#LoadModule http2_module modules/mod_http2.so
+#LoadModule proxy_http2_module modules/mod_proxy_http2.so
+#LoadModule md_module modules/mod_md.so
+#LoadModule lbmethod_byrequests_module modules/mod_lbmethod_byrequests.so
+#LoadModule lbmethod_bytraffic_module modules/mod_lbmethod_bytraffic.so
+#LoadModule lbmethod_bybusyness_module modules/mod_lbmethod_bybusyness.so
+#LoadModule lbmethod_heartbeat_module modules/mod_lbmethod_heartbeat.so
+LoadModule unixd_module modules/mod_unixd.so
+#LoadModule heartbeat_module modules/mod_heartbeat.so
+#LoadModule heartmonitor_module modules/mod_heartmonitor.so
+#LoadModule dav_module modules/mod_dav.so
+#LoadModule status_module modules/mod_status.so
+#LoadModule autoindex_module modules/mod_autoindex.so
+#LoadModule asis_module modules/mod_asis.so
+#LoadModule info_module modules/mod_info.so
+#LoadModule suexec_module modules/mod_suexec.so
+
+ #LoadModule cgid_module modules/mod_cgid.so
+
+
+ #LoadModule cgi_module modules/mod_cgi.so
+
+#LoadModule dav_fs_module modules/mod_dav_fs.so
+#LoadModule dav_lock_module modules/mod_dav_lock.so
+#LoadModule vhost_alias_module modules/mod_vhost_alias.so
+#LoadModule negotiation_module modules/mod_negotiation.so
+LoadModule dir_module modules/mod_dir.so
+#LoadModule imagemap_module modules/mod_imagemap.so
+#LoadModule actions_module modules/mod_actions.so
+#LoadModule speling_module modules/mod_speling.so
+#LoadModule userdir_module modules/mod_userdir.so
+#LoadModule alias_module modules/mod_alias.so
+#LoadModule rewrite_module modules/mod_rewrite.so
+
+
+#
+# If you wish httpd to run as a different user or group, you must run
+# httpd as root initially and it will switch.
+#
+# User/Group: The name (or #number) of the user/group to run httpd as.
+# It is usually good practice to create a dedicated user and group for
+# running httpd, as with most system services.
+#
+User www-data
+Group www-data
+
+
+
+# 'Main' server configuration
+#
+# The directives in this section set up the values used by the 'main'
+# server, which responds to any requests that aren't handled by a
+# definition. These values also provide defaults for
+# any containers you may define later in the file.
+#
+# All of these directives may appear inside containers,
+# in which case these default settings will be overridden for the
+# virtual host being defined.
+#
+
+#
+# ServerAdmin: Your address, where problems with the server should be
+# e-mailed. This address appears on some server-generated pages, such
+# as error documents. e.g. admin@your-domain.com
+#
+ServerAdmin admin@wtf-eg.de
+
+#
+# ServerName gives the name and port that the server uses to identify itself.
+# This can often be determined automatically, but we recommend you specify
+# it explicitly to prevent problems during startup.
+#
+# If your host doesn't have a registered DNS name, enter its IP address here.
+#
+#ServerName www.example.com:80
+
+#
+# Deny access to the entirety of your server's filesystem. You must
+# explicitly permit access to web content directories in other
+# blocks below.
+#
+
+ AllowOverride none
+ Require all denied
+
+
+#
+# Note that from this point forward you must specifically allow
+# particular features to be enabled - so if something's not working as
+# you might expect, make sure that you have specifically enabled it
+# below.
+#
+
+#
+# DocumentRoot: The directory out of which you will serve your
+# documents. By default, all requests are taken from this directory, but
+# symbolic links and aliases may be used to point to other locations.
+#
+DocumentRoot "/usr/local/apache2/htdocs"
+
+ #
+ # Possible values for the Options directive are "None", "All",
+ # or any combination of:
+ # Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI MultiViews
+ #
+ # Note that "MultiViews" must be named *explicitly* --- "Options All"
+ # doesn't give it to you.
+ #
+ # The Options directive is both complicated and important. Please see
+ # http://httpd.apache.org/docs/2.4/mod/core.html#options
+ # for more information.
+ #
+ Options Indexes FollowSymLinks
+
+ #
+ # AllowOverride controls what directives may be placed in .htaccess files.
+ # It can be "All", "None", or any combination of the keywords:
+ # AllowOverride FileInfo AuthConfig Limit
+ #
+ AllowOverride None
+
+ #
+ # Controls who can get stuff from this server.
+ #
+ Require valid-user
+ AuthName "WTF-Login"
+ AuthType Basic
+ AuthBasicProvider ldap
+ AuthLDAPURL ${LDAP_AUTH_URL}
+ AuthLDAPBindDN ${LDAP_AUTH_BIND_DN}
+ AuthLDAPBindPassword ${LDAP_AUTH_BIND_PASSWORD}
+
+
+#
+# DirectoryIndex: sets the file that Apache will serve if a directory
+# is requested.
+#
+
+ DirectoryIndex index.html
+
+
+#
+# The following lines prevent .htaccess and .htpasswd files from being
+# viewed by Web clients.
+#
+
+ Require all denied
+
+
+#
+# ErrorLog: The location of the error log file.
+# If you do not specify an ErrorLog directive within a
+# container, error messages relating to that virtual host will be
+# logged here. If you *do* define an error logfile for a
+# container, that host's errors will be logged there and not here.
+#
+ErrorLog /proc/self/fd/2
+
+#
+# LogLevel: Control the number of messages logged to the error_log.
+# Possible values include: debug, info, notice, warn, error, crit,
+# alert, emerg.
+#
+LogLevel warn
+
+
+ #
+ # The following directives define some format nicknames for use with
+ # a CustomLog directive (see below).
+ #
+ LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
+ LogFormat "%h %l %u %t \"%r\" %>s %b" common
+
+
+ # You need to enable mod_logio.c to use %I and %O
+ LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio
+
+
+ #
+ # The location and format of the access logfile (Common Logfile Format).
+ # If you do not define any access logfiles within a
+ # container, they will be logged here. Contrariwise, if you *do*
+ # define per- access logfiles, transactions will be
+ # logged therein and *not* in this file.
+ #
+ CustomLog /proc/self/fd/1 common
+
+ #
+ # If you prefer a logfile with access, agent, and referer information
+ # (Combined Logfile Format) you can use the following directive.
+ #
+ #CustomLog "logs/access_log" combined
+
+
+
+ #
+ # Redirect: Allows you to tell clients about documents that used to
+ # exist in your server's namespace, but do not anymore. The client
+ # will make a new request for the document at its new location.
+ # Example:
+ # Redirect permanent /foo http://www.example.com/bar
+
+ #
+ # Alias: Maps web paths into filesystem paths and is used to
+ # access content that does not live under the DocumentRoot.
+ # Example:
+ # Alias /webpath /full/filesystem/path
+ #
+ # If you include a trailing / on /webpath then the server will
+ # require it to be present in the URL. You will also likely
+ # need to provide a section to allow access to
+ # the filesystem path.
+
+ #
+ # ScriptAlias: This controls which directories contain server scripts.
+ # ScriptAliases are essentially the same as Aliases, except that
+ # documents in the target directory are treated as applications and
+ # run by the server when requested rather than as documents sent to the
+ # client. The same rules about trailing "/" apply to ScriptAlias
+ # directives as to Alias.
+ #
+ ScriptAlias /cgi-bin/ "/usr/local/apache2/cgi-bin/"
+
+
+
+
+ #
+ # ScriptSock: On threaded servers, designate the path to the UNIX
+ # socket used to communicate with the CGI daemon of mod_cgid.
+ #
+ #Scriptsock cgisock
+
+
+#
+# "/usr/local/apache2/cgi-bin" should be changed to whatever your ScriptAliased
+# CGI directory exists, if you have that configured.
+#
+
+ AllowOverride None
+ Options None
+ Require all granted
+
+
+
+ #
+ # Avoid passing HTTP_PROXY environment to CGI's on this or any proxied
+ # backend servers which have lingering "httpoxy" defects.
+ # 'Proxy' request header is undefined by the IETF, not listed by IANA
+ #
+ RequestHeader unset Proxy early
+
+
+
+ #
+ # TypesConfig points to the file containing the list of mappings from
+ # filename extension to MIME-type.
+ #
+ TypesConfig conf/mime.types
+
+ #
+ # AddType allows you to add to or override the MIME configuration
+ # file specified in TypesConfig for specific file types.
+ #
+ #AddType application/x-gzip .tgz
+ #
+ # AddEncoding allows you to have certain browsers uncompress
+ # information on the fly. Note: Not all browsers support this.
+ #
+ #AddEncoding x-compress .Z
+ #AddEncoding x-gzip .gz .tgz
+ #
+ # If the AddEncoding directives above are commented-out, then you
+ # probably should define those extensions to indicate media types:
+ #
+ AddType application/x-compress .Z
+ AddType application/x-gzip .gz .tgz
+
+ #
+ # AddHandler allows you to map certain file extensions to "handlers":
+ # actions unrelated to filetype. These can be either built into the server
+ # or added with the Action directive (see below)
+ #
+ # To use CGI scripts outside of ScriptAliased directories:
+ # (You will also need to add "ExecCGI" to the "Options" directive.)
+ #
+ #AddHandler cgi-script .cgi
+
+ # For type maps (negotiated resources):
+ #AddHandler type-map var
+
+ #
+ # Filters allow you to process content before it is sent to the client.
+ #
+ # To parse .shtml files for server-side includes (SSI):
+ # (You will also need to add "Includes" to the "Options" directive.)
+ #
+ #AddType text/html .shtml
+ #AddOutputFilter INCLUDES .shtml
+
+
+#
+# The mod_mime_magic module allows the server to use various hints from the
+# contents of the file itself to determine its type. The MIMEMagicFile
+# directive tells the module where the hint definitions are located.
+#
+#MIMEMagicFile conf/magic
+
+#
+# Customizable error responses come in three flavors:
+# 1) plain text 2) local redirects 3) external redirects
+#
+# Some examples:
+#ErrorDocument 500 "The server made a boo boo."
+#ErrorDocument 404 /missing.html
+#ErrorDocument 404 "/cgi-bin/missing_handler.pl"
+#ErrorDocument 402 http://www.example.com/subscription_info.html
+#
+
+#
+# MaxRanges: Maximum number of Ranges in a request before
+# returning the entire resource, or one of the special
+# values 'default', 'none' or 'unlimited'.
+# Default setting is to accept 200 Ranges.
+#MaxRanges unlimited
+
+#
+# EnableMMAP and EnableSendfile: On systems that support it,
+# memory-mapping or the sendfile syscall may be used to deliver
+# files. This usually improves server performance, but must
+# be turned off when serving from networked-mounted
+# filesystems or if support for these functions is otherwise
+# broken on your system.
+# Defaults: EnableMMAP On, EnableSendfile Off
+#
+#EnableMMAP off
+#EnableSendfile on
+
+# Supplemental configuration
+#
+# The configuration files in the conf/extra/ directory can be
+# included to add extra features or to modify the default configuration of
+# the server, or you may simply copy their contents here and change as
+# necessary.
+
+# Server-pool management (MPM specific)
+#Include conf/extra/httpd-mpm.conf
+
+# Multi-language error messages
+#Include conf/extra/httpd-multilang-errordoc.conf
+
+# Fancy directory listings
+#Include conf/extra/httpd-autoindex.conf
+
+# Language settings
+#Include conf/extra/httpd-languages.conf
+
+# User home directories
+#Include conf/extra/httpd-userdir.conf
+
+# Real-time info on requests and configuration
+#Include conf/extra/httpd-info.conf
+
+# Virtual hosts
+#Include conf/extra/httpd-vhosts.conf
+
+# Local access to the Apache HTTP Server Manual
+#Include conf/extra/httpd-manual.conf
+
+# Distributed authoring and versioning (WebDAV)
+#Include conf/extra/httpd-dav.conf
+
+# Various default settings
+#Include conf/extra/httpd-default.conf
+
+# Configure mod_proxy_html to understand HTML4/XHTML1
+
+Include conf/extra/proxy-html.conf
+
+
+# Secure (SSL/TLS) connections
+#Include conf/extra/httpd-ssl.conf
+#
+# Note: The following must must be present to support
+# starting without SSL on platforms with no /dev/random equivalent
+# but a statically compiled-in mod_ssl.
+#
+
+SSLRandomSeed startup builtin
+SSLRandomSeed connect builtin
+