== How-to do CSW transaction operation using different languages ? ==

This how-to describes how to connect to a !GeoNetwork node using the CSW protocol and perfoms transaction operations (eg. !Insert/Update/Delete).

[[PageOutline]]


=== Javascript ===

https://geonetwork.svn.sourceforge.net/svnroot/geonetwork/trunk/web/geonetwork/scripts/test-csw.js
loginAndRun method.

=== Python ===
{{{
Python 2.6
Wolfgang Grunberg
Arizona Geological Survey
10/20/2009
"""

# Library Imports
import urllib
import urllib2
import cookielib

# module globals and constants
__author__ = "Wolfgang Grunberg"
__credits__ = ["Wolfgang Grunberg", "the Internets"]
__email__ = "wgrunberg@azgs.az.gov"
__status__ = "Prototype"                  # "Prototype", "Development", or "Production"

# GeoNetwork constants
gn_username = "admin"
gn_password = "admin"
gn_baseURL = "http://localhost:8080"
gn_loginURI = "/geonetwork/srv/en/xml.user.login"
gn_logoutURI = "/geonetwork/srv/en/xml.user.logout"
gn_cswURI = "/geonetwork/srv/en/csw"


def gn_csw_transaction():
   """
   Execute GeoNetwork authentication and CSW transaction post
   """
   # HTTP header for authentication
   header_urlencode = {"Content-type": "application/x-www-form-urlencoded", "Accept": "text/plain"}
   # HTTP header for CSW request
   header_xml = {"Content-type": "application/xml", "Accept": "text/plain"}
   # authentication Post parameters
   post_parameters = urllib.urlencode({"username": gn_username, "password": gn_password})

   # Sample CSW transactions
   xml_request = "<?xml version=\"1.0\"?>\
           <csw:DescribeRecord xmlns:csw=\"http://www.opengis.net/cat/csw/2.0.2\"\
           service=\"CSW\" version=\"2.0.2\" outputFormat=\"application/xml\"\
           schemaLanguage=\"http://www.w3.org/XML/Schema\"/>"

   # log in URL
   url_in = gn_baseURL+gn_loginURI
   # log out URL
   url_out = gn_baseURL+gn_logoutURI
   # CSW URL
   url_csw = gn_baseURL+gn_cswURI


   # first, always log out
   request = urllib2.Request(url_out)
   response = urllib2.urlopen(request)
   #print response.read()       # debug

   # send authentication request
   request = urllib2.Request(url_in, post_parameters, header_urlencode)
   response = urllib2.urlopen(request)
   # a basic memory-only cookie jar instance
   cookies = cookielib.CookieJar()
   cookies.extract_cookies(response,request)
   cookie_handler= urllib2.HTTPCookieProcessor( cookies )
   # a redirect handler
   redirect_handler= urllib2.HTTPRedirectHandler()
   # save cookie and redirect handler for future HTTP Posts
   opener = urllib2.build_opener(redirect_handler,cookie_handler)

   # CSW request
   request = urllib2.Request(url_csw, xml_request2, header_xml)
   response = opener.open(request)
   # CSW respons
   xml_response = response.read()
   print xml_response  # debug

   # Do something with the response. For example:
   #xmldoc = minidom.parseString(xml_response)
   #for node in xmldoc.getElementsByTagName('ows:ExceptionText'):       # display <ows:ExceptionText /> value(s)
   #    print "    EXCEPTION: "+node.firstChild.nodeValue
   #xmldoc.unlink()     # cleanup DOM for improved performance

   # more CSW requests if desired

   # Last, always log out
   request = urllib2.Request(url_out)
   response = opener.open(request)
   #print response.read()       # debug


if __name__=="__main__":
   gn_csw_transaction()
}}}


=== PHP ===
 * See Attachement: cswClient.php
 * Author: Pierre Lagarde


=== Other discussions ===
 * http://n2.nabble.com/How-to-authenticate-for-CSW-Insert-Transaction-HTTP-Post-td3850398.html#a3850398
 * http://n2.nabble.com/CSW-Transaction-initiee-en-PHP-td3471308.html#a3471308