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Handle MI_Metadata from CSW record XML #210

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Handle MI_Metadata from CSW record XML #210

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38 changes: 25 additions & 13 deletions ckanext/spatial/lib/csw_client.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,14 +17,14 @@ class OwsService(object):
def __init__(self, endpoint=None):
if endpoint is not None:
self._ows(endpoint)

def __call__(self, args):
return getattr(self, args.operation)(**self._xmd(args))

@classmethod
def _operations(cls):
return [x for x in dir(cls) if not x.startswith("_")]

def _xmd(self, obj):
md = {}
for attr in [x for x in dir(obj) if not x.startswith("_")]:
Expand All @@ -42,7 +42,7 @@ def _xmd(self, obj):
else:
md[attr] = self._xmd(val)
return md

def _ows(self, endpoint=None, **kw):
if not hasattr(self, "_Implementation"):
raise NotImplementedError("Needs an Implementation")
Expand All @@ -51,7 +51,7 @@ def _ows(self, endpoint=None, **kw):
raise ValueError("Must specify a service endpoint")
self.__ows_obj__ = self._Implementation(endpoint)
return self.__ows_obj__

def getcapabilities(self, debug=False, **kw):
ows = self._ows(**kw)
caps = self._xmd(ows)
Expand All @@ -60,7 +60,7 @@ def getcapabilities(self, debug=False, **kw):
if "response" in caps: del caps["response"]
if "owscommon" in caps: del caps["owscommon"]
return caps

class CswService(OwsService):
"""
Perform various operations on a CSW service
Expand Down Expand Up @@ -173,19 +173,31 @@ def getrecordbyid(self, ids=[], esn="full", outputschema="gmd", **kw):
record = self._xmd(csw.records.values()[0])

## strip off the enclosing results container, we only want the metadata
#md = csw._exml.find("/gmd:MD_Metadata")#, namespaces=namespaces)
# Ordinary Python version's don't support the metadata argument
md = csw._exml.find("/{http://www.isotc211.org/2005/gmd}MD_Metadata")
# Ordinary Python versions don't support the metadata argument
# get the first element matching gmd:MD_Metadata or gmi:MI_Metadata
# or return None if not found
md = next(iter(csw._exml.xpath("./gmd:MD_Metadata|./gmi:MI_Metadata",
namespaces=namespaces)), None)
# If MD_Metadata or MI_Metadata is not the root element, raise
# an error
if md is None:
raise ValueError("Could not find MD_Metadata or MI_Metadata "
"in XML document")

mdtree = etree.ElementTree(md)
try:
record["xml"] = etree.tostring(mdtree, pretty_print=True, encoding=unicode)
record["xml"] = etree.tostring(mdtree, pretty_print=True,
encoding='unicode')
except TypeError:
# API incompatibilities between different flavours of elementtree
try:
record["xml"] = etree.tostring(mdtree, pretty_print=True, encoding=unicode)
record["xml"] = etree.tostring(mdtree, pretty_print=True,
encoding='unicode')
except AssertionError:
record["xml"] = etree.tostring(md, pretty_print=True, encoding=unicode)
record["xml"] = etree.tostring(md, pretty_print=True,
encoding='unicode')

record["xml"] = '<?xml version="1.0" encoding="UTF-8"?>\n' + record["xml"]
record["xml"] = ('<?xml version="1.0" encoding="UTF-8"?>\n'
'{}'.format(record["xml"]))
record["tree"] = mdtree
return record