Map Wrap - MapServer wrapper

A MapServer CGI wrapper that simplifies the URLs to your WMS services and provides the following features:

• defaults SERVICE to WMS
• defaults REQUEST to GetCapabilities
• allows for projection optimized mapfiles
• accepts both POST and GET requests
• simple name alias for a map
• ghetto list of available MapServer maps

Why is that useful?

I like simple URLs to remember and hiding my secrets. Users do not need to know, and I should have to remember, the path to my mapfiles. I hate having to specify ?SERVICE=WMS&REQUEST=GetCapabilities when doing my sanity check with curl.

INSTALL:

To use this handy wrapper script you have to setup a few things.

• create an user friendly alias (for your users, not you)

See apache config section below for example

• configure the FUN_PREFIX to the prefix you choose

FUN_PREFIX = "/map"

• point the CONFIG_FILE at the correct location (defaults to ../conf.yml)

CONFIG_FILE = "/path/to/mapwrap/conf.yml"

• Creat the config file (see below)

• tail -f error.log and access.log, reload apache

• Check the output of a GetCapabilities:

curl 'http://localhost/map/example' | less

Apache Configuration

The following can be slide into appropriate Apache config section or /etc/httpd/conf.d/mapwrap.conf for a global configuration:

<Directory "/path/to/mapwrap/cgi-bin">
  AllowOverride None
  Options ExecCGI  FollowSymLinks
  AddHandler cgi-script .rb
  Order allow,deny
  Allow from all
</Directory>
# The following is the FUN_PREFIX=/map
Alias /map /path/to/mapwrap/cgi-bin/mapwrap.rb

Configuration: conf.yml

Hopefully the only part you have to maintain after you've set things up correctly. To get started just do a somple cp conf.yml.default conf.yml

mapserv: /opt/mapping_tools/bin/mapserv.svn
envsh: /opt/mapping_tools/setup.sh
maps:
  bluemarble: /www/wms/apps/mapserver/maps/bluemarble.map
  example: /www/wms/apps/mapserver/maps/bluemarble.map
  spot_pan:
    default: /www/wms/apps/mapserver/maps/spot_pan.map
    900913: /www/wms/apps/mapserver/maps/spot_pan-900913.map

The mapserv and envsh options are optional. If you have a good CGI environment with mapserv and libraries available then delete those lines.

The maps section takes a name and a path to a mapfile. If you want to have an optimized mapfile for multiple pre-projected datasets then break it apart with a default line and a line for each EPSG code you've got.

Credit where credit is due

• spruceboy is the man behind the curtain.