146 lines
4.7 KiB
Python
146 lines
4.7 KiB
Python
import os
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import re
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##
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import requests
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from lxml import etree
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# https://stackoverflow.com/questions/30232031/how-can-i-strip-namespaces-out-of-an-lxml-tree/30233635#30233635 ?
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_patterns = {'raw': re.compile(r'^\s*(?P<xml><(\?xml|aif)\s+.*)\s*$', re.DOTALL|re.MULTILINE),
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'remote': re.compile(r'^(?P<uri>(?P<proto>(https?|ftps?)://)(?P<path>.*))\s*$'),
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'local': re.compile(r'^(file://)?(?P<path>(/?[^/]+)+/?)$')}
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class Config(object):
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def __init__(self, *args, **kwargs):
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self.tree = None
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self.namespaced_tree = None
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self.xml = None
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self.namespaced_xml = None
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self.raw = None
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self.xsd = None
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def main(self, validate = True):
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self.fetch()
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self.parseRaw()
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if validate:
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self.validate()
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return()
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def fetch(self): # Just a fail-safe; this is overridden by specific subclasses.
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pass
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return()
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def getXSD(self, xsdpath = None):
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raw_xsd = None
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if xsdpath:
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xsdpath = os.path.abspath(os.path.expanduser(xsdpath))
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if not os.path.isfile(xsdpath):
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raise ValueError(('An explicit XSD path was specified but '
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'does not exist on the local filesystem'))
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with open(xsdpath, 'rb') as fh:
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raw_xsd = fh.read()
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else:
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xsi = self.xml.nsmap.get('xsi', 'http://www.w3.org/2001/XMLSchema-instance')
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schemaLocation = '{{{0}}}schemaLocation'.format(xsi)
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schemaURL = self.xml.attrib.get(schemaLocation,
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'https://aif-ng.io/aif.xsd?ref={0}'.format(self.xml.attrib['version']))
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req = requests.get(schemaURL)
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if not req.ok():
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raise RuntimeError('Could not download XSD')
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raw_xsd = req.content
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self.xsd = etree.XMLSchema(etree.XML(raw_xsd))
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return()
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def parseRaw(self):
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self.tree = etree.parse(self.raw)
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self.namespaced_tree = etree.parse(self.raw)
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self.xml = self.tree.getroot()
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self.namespaced_xml = self.namespaced_tree.getroot()
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self.tree.xinclude()
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self.namespaced_tree.xinclude()
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return()
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def stripNS(self):
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# https://stackoverflow.com/questions/30232031/how-can-i-strip-namespaces-out-of-an-lxml-tree/30233635#30233635
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for x in (self.tree, self.xml):
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for e in x.xpath("descendant-or-self::*[namespace-uri()!='']"):
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e.tag = etree.QName(e).localname
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return()
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def validate(self):
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if not self.xsd:
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self.getXSD()
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return()
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class LocalFile(Config):
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def __init__(self, path, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.source = ['local', _patterns['local'].search(path).group('path')]
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def fetch(self):
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self.source[1] = os.path.abspath(os.path.expanduser(self.source[1]))
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if not os.path.isfile(self.source[1]):
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raise ValueError('{0} does not exist'.format(self.source[1]))
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with open(self.source[1], 'rb') as fh:
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self.raw = fh.read()
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return()
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class RemoteFile(Config):
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def __init__(self, uri, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.source = ('remote', uri)
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def fetch(self):
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r = requests.get(self.source[1])
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if not r.ok():
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raise RuntimeError('Could not download XML')
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self.raw = r.content
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return()
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class ConfigStr(Config):
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def __init__(self, rawxml, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.source = ('raw', rawxml)
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def fetch(self):
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self.raw = self.source[1].encode('utf-8')
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return()
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class ConfigBin(Config):
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def __init__(self, rawbinaryxml, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.source = ('raw_binary', rawbinaryxml)
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def fetch(self):
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self.raw = self.source[1]
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return()
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def getConfig(cfg_ref, validate = True):
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cfgobj = None
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# This is kind of gross.
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for configtype, pattern in _patterns.items():
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try:
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if pattern.search(cfg_ref):
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if configtype == 'raw':
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cfgobj = ConfigStr(cfg_ref)
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elif configtype == 'remote':
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cfgobj = RemoteFile(cfg_ref)
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elif configtype == 'local':
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cfgobj = LocalFile(cfg_ref)
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if cfgobj:
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break
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except TypeError:
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ptrn = re.compile(_patterns['raw'].pattern.encode('utf-8'))
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if not ptrn.search(cfg_ref):
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raise ValueError('Received junk data for cfg_ref')
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else:
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cfgobj = ConfigBin(cfg_ref)
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break
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return(cfgobj)
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