def _extract_file_format(self, url, headers):
"""
Makes a best guess at the file format.
/path/to/a_file.csv has format "CSV"
/path/to/a_file.csv.zip has format "CSV / Zip"
First this function tries to extract the file-extensions from the url,
and deduce the format from there. If no file-extension is found, then
the mimetype from the headers is passed to `mimetypes.guess_extension()`.
"""
formats = []
parsed_url = urlparse.urlparse(url)
path = parsed_url.path
base, extension = posixpath.splitext(path)
while extension:
formats.append(extension[1:].upper()) # strip leading '.' from extension
base, extension = posixpath.splitext(base)
if formats:
extension = ".".join(formats[::-1]).lower()
format_tuple = ckan_helpers.resource_formats().get(extension)
if format_tuple:
return format_tuple[1]
return " / ".join(formats[::-1])
# No file extension found, attempt to extract format using the mimetype
stripped_mimetype = self._extract_mimetype(headers) # stripped of charset
format_tuple = ckan_helpers.resource_formats().get(stripped_mimetype)
if format_tuple:
return format_tuple[1]
extension = mimetypes.guess_extension(stripped_mimetype)
if extension:
return extension[1:].upper()
def score_by_format_field(resource, score_reasons):
'''
Looks at the format field of a resource to determine its format and score.
It adds strings to score_reasons list about how it came to the conclusion.
Return values:
* It returns a tuple: (score, format_string)
* If it cannot work out the format then format_string is None
* If it cannot score it, then score is None
'''
format_field = resource.format or ''
if not format_field:
score_reasons.append(_('Format field is blank.'))
return (None, None)
format_tuple = ckan_helpers.resource_formats().get(format_field.lower()) or \
ckan_helpers.resource_formats().get(lib.munge_format_to_be_canonical(format_field))
if not format_tuple:
score_reasons.append(
_('Format field "%s" does not correspond to a known format.') %
format_field)
return (None, None)
score = lib.resource_format_scores().get(format_tuple[1])
score_reasons.append(
_('Format field "%s" receives score: %s.') % (format_field, score))
return (score, format_tuple[1])
def _extract_file_format(url, headers):
"""
Makes a best guess at the file format.
/path/to/a_file.csv has format "CSV"
/path/to/a_file.csv.zip has format "CSV / Zip"
First this function tries to extract the file-extensions from the url,
and deduce the format from there. If no file-extension is found, then
the mimetype from the headers is passed to `mimetypes.guess_extension()`.
"""
formats = []
parsed_url = urlparse.urlparse(url)
path = parsed_url.path
base, extension = posixpath.splitext(path)
while extension:
formats.append(
extension[1:].upper()) # strip leading '.' from extension
base, extension = posixpath.splitext(base)
if formats:
extension = '.'.join(formats[::-1]).lower()
format_tuple = ckan_helpers.resource_formats().get(extension)
if format_tuple:
return format_tuple[1]
return ' / '.join(formats[::-1])
# No file extension found, attempt to extract format using the mimetype
stripped_mimetype = _extract_mimetype(headers) # stripped of charset
format_tuple = ckan_helpers.resource_formats().get(stripped_mimetype)
if format_tuple:
return format_tuple[1]
extension = mimetypes.guess_extension(stripped_mimetype)
if extension:
return extension[1:].upper()
def set_sniffed_format(format_name):
global sniffed_format
if format_name:
format_tuple = ckan_helpers.resource_formats().get(format_name.lower())
sniffed_format = {'format': format_tuple[1]}
else:
sniffed_format = None
def set_sniffed_format(format_name):
global sniffed_format
if format_name:
format_tuple = ckan_helpers.resource_formats().get(format_name.lower())
sniffed_format = {'format': format_tuple[1]}
else:
sniffed_format = None
def run_bsd_file(filepath, log):
'''Run the BSD command-line tool "file" to determine file type. Returns
a format dict or None if it fails.'''
result = check_output(['file', filepath])
match = re.search('Name of Creating Application: ([^,]*),', result)
if match:
app_name = match.groups()[0]
format_map = {'Microsoft Office PowerPoint': 'ppt',
'Microsoft PowerPoint': 'ppt',
'Microsoft Excel': 'xls',
'Microsoft Office Word': 'doc',
'Microsoft Word 10.0': 'doc',
'Microsoft Macintosh Word': 'doc',
}
if app_name in format_map:
extension = format_map[app_name]
format_tuple = ckan_helpers.resource_formats()[extension]
log.info('"file" detected file format: %s',
format_tuple[2])
return {'format': format_tuple[1]}
match = re.search(': ESRI Shapefile', result)
if match:
format_ = {'format': 'SHP'}
log.info('"file" detected file format: %s',
format_['format'])
return format_
log.info('"file" could not determine file format of "%s": %s',
filepath, result)
def run_bsd_file(filepath, log):
'''Run the BSD command-line tool "file" to determine file type. Returns
a format dict or None if it fails.'''
result = check_output(['file', filepath])
match = re.search('Name of Creating Application: ([^,]*),', result)
if match:
app_name = match.groups()[0]
format_map = {
'Microsoft Office PowerPoint': 'ppt',
'Microsoft PowerPoint': 'ppt',
'Microsoft Excel': 'xls',
'Microsoft Office Word': 'doc',
'Microsoft Word 10.0': 'doc',
'Microsoft Macintosh Word': 'doc',
}
if app_name in format_map:
extension = format_map[app_name]
format_tuple = ckan_helpers.resource_formats()[extension]
log.info('"file" detected file format: %s', format_tuple[2])
return {'format': format_tuple[1]}
match = re.search(': ESRI Shapefile', result)
if match:
format_ = {'format': 'SHP'}
log.info('"file" detected file format: %s', format_['format'])
return format_
log.info('"file" could not determine file format of "%s": %s', filepath,
result)
def _clean_format(cls, format_string):
if isinstance(format_string, basestring):
matched_format = helpers.resource_formats().get(format_string.lower().strip(' .'))
if matched_format:
return matched_format[1]
return re.sub(cls._disallowed_characters, '', format_string).strip()
else:
return format_string
def _clean_format(cls, format_string):
if isinstance(format_string, basestring):
matched_format = helpers.resource_formats().get(
format_string.lower().strip(' .'))
if matched_format:
return matched_format[1]
return re.sub(cls._disallowed_characters, '',
format_string).strip()
else:
return format_string
def format_get(key):
'''Returns a resource format, as defined in ckan.
:param key: format extension / mimetype / title e.g. 'CSV',
'application/msword', 'Word document'
:param key: string
:returns: format string
'''
format_tuple = ckan_helpers.resource_formats().get(key.lower())
if not format_tuple:
return
return format_tuple[1] # short name
def format_get(key):
'''Returns a resource format, as defined in ckan.
:param key: format extension / mimetype / title e.g. 'CSV',
'application/msword', 'Word document'
:param key: string
:returns: format string
'''
format_tuple = ckan_helpers.resource_formats().get(key.lower())
if not format_tuple:
return
return format_tuple[1] # short name
def score_by_format_field(resource, score_reasons):
'''
Looks at the format field of a resource to determine its format and score.
It adds strings to score_reasons list about how it came to the conclusion.
Return values:
* It returns a tuple: (score, format_string)
* If it cannot work out the format then format_string is None
* If it cannot score it, then score is None
'''
format_field = resource.format or ''
if not format_field:
score_reasons.append(_('Format field is blank.'))
return (None, None)
format_tuple = ckan_helpers.resource_formats().get(format_field.lower()) or \
ckan_helpers.resource_formats().get(lib.munge_format_to_be_canonical(format_field))
if not format_tuple:
score_reasons.append(_('Format field "%s" does not correspond to a known format.') % format_field)
return (None, None)
score = lib.resource_format_scores().get(format_tuple[1])
score_reasons.append(_('Format field "%s" receives score: %s.') %
(format_field, score))
return (score, format_tuple[1])
def get_xml_variant_without_xml_declaration(buf):
'''If this buffer is in a format based on XML, without any XML declaration
or other boilerplate, return the format type.'''
# Parse the XML to find the first tag name.
# Using expat directly, rather than go through xml.sax, since using I
# couldn't see how to give it a string, so used StringIO which failed
# for some files curiously.
import xml.parsers.expat
class GotFirstTag(Exception):
pass
def start_element(name, attrs):
raise GotFirstTag(name)
p = xml.parsers.expat.ParserCreate()
p.StartElementHandler = start_element
try:
p.Parse(buf)
except GotFirstTag as e:
top_level_tag_name = six.text_type(e).lower()
except xml.sax.SAXException as e:
log.info('Sax parse error: %s %s', e, buf)
return {'format': 'XML'}
log.info('Top level tag detected as: %s', top_level_tag_name)
top_level_tag_name = top_level_tag_name.replace('rdf:rdf', 'rdf')
top_level_tag_name = top_level_tag_name.replace('wms_capabilities',
'wms') # WMS 1.3
top_level_tag_name = top_level_tag_name.replace('wmt_ms_capabilities',
'wms') # WMS 1.1.1
top_level_tag_name = re.sub('wfs:.*', 'wfs', top_level_tag_name) # WFS 2.0
top_level_tag_name = top_level_tag_name.replace('wfs_capabilities',
'wfs') # WFS 1.0/1.1
top_level_tag_name = top_level_tag_name.replace('feed', 'atom feed')
if top_level_tag_name.lower() == 'capabilities' and \
'xmlns="http://www.opengis.net/wmts/' in buf:
top_level_tag_name = 'wmts'
if top_level_tag_name.lower() in ('coveragedescriptions', 'capabilities') and \
'xmlns="http://www.opengis.net/wcs/' in buf:
top_level_tag_name = 'wcs'
format_tuple = ckan_helpers.resource_formats().get(top_level_tag_name)
if format_tuple:
format_ = {'format': format_tuple[1]}
log.info('XML variant detected: %s', format_tuple[2])
return format_
log.warning('Did not recognise XML format: %s', top_level_tag_name)
return {'format': 'XML'}
def get_xml_variant_without_xml_declaration(buf, log):
'''If this buffer is in a format based on XML, without any XML declaration
or other boilerplate, return the format type.'''
xml_re = '.{0,3}\s*<([^>\s]*)'
match = re.match(xml_re, buf)
if match:
top_level_tag_name = match.groups()[-1].lower()
top_level_tag_name = top_level_tag_name.replace('rdf:rdf', 'rdf')
top_level_tag_name = top_level_tag_name.replace('wms_capabilities', 'wms') # WMS 1.3
top_level_tag_name = top_level_tag_name.replace('wmt_ms_capabilities', 'wms') # WMS 1.1.1
format_tuple = ckan_helpers.resource_formats().get(top_level_tag_name)
if format_tuple:
format_ = {'format': format_tuple[1]}
log.info('XML variant detected: %s', format_tuple[2])
return format_
log.warning('Did not recognise XML format: %s', top_level_tag_name)
return {'format': 'XML'}
log.debug('XML tags not found: %s', buf)
def get_xml_variant_without_xml_declaration(buf, log):
'''If this buffer is in a format based on XML, without any XML declaration
or other boilerplate, return the format type.'''
xml_re = '.{0,3}\s*<([^>\s]*)'
match = re.match(xml_re, buf)
if match:
top_level_tag_name = match.groups()[-1].lower()
top_level_tag_name = top_level_tag_name.replace('rdf:rdf', 'rdf')
top_level_tag_name = top_level_tag_name.replace(
'wms_capabilities', 'wms') # WMS 1.3
top_level_tag_name = top_level_tag_name.replace(
'wmt_ms_capabilities', 'wms') # WMS 1.1.1
format_tuple = ckan_helpers.resource_formats().get(top_level_tag_name)
if format_tuple:
format_ = {'format': format_tuple[1]}
log.info('XML variant detected: %s', format_tuple[2])
return format_
log.warning('Did not recognise XML format: %s', top_level_tag_name)
return {'format': 'XML'}
log.debug('XML tags not found: %s', buf)
def hdx_unified_resource_format(format):
'''
This function is based on the unified_resource_format() function from ckan.lib.helpers.
As the one from core ckan it checks the resource formats configuration to translate the
format string to a standard format.
The difference is that in case nothing is found in 'resource_formats.json' then it's
turned to lowercase.
:param format: resource format as written by the user
:type format: string
:return:
:rtype:
'''
formats = h.resource_formats()
format_clean = format.lower()
if format_clean in formats:
format_new = formats[format_clean][1]
else:
format_new = format_clean
return format_new
def sniff_file_format(filepath, log):
'''For a given filepath, work out what file format it is.
Returns a dict with format as a string, which is the format's canonical
shortname (as defined by ckan's resource_formats.json) and a key that says
if it is contained in a zip or something.
e.g. {'format': 'CSV',
'container': 'zip',
}
or None if it can\'t tell what it is.
'''
format_ = None
log.info('Sniffing file format of: %s', filepath)
filepath_utf8 = filepath.encode('utf8') if isinstance(filepath, unicode) \
else filepath
mime_type = magic.from_file(filepath_utf8, mime=True)
log.info('Magic detects file as: %s', mime_type)
if mime_type:
if mime_type == 'application/xml':
with open(filepath) as f:
buf = f.read(5000)
format_ = get_xml_variant_including_xml_declaration(buf, log)
elif mime_type == 'application/zip':
format_ = get_zipped_format(filepath, log)
elif mime_type in ('application/msword', 'application/vnd.ms-office'):
# In the past Magic gives the msword mime-type for Word and other
# MS Office files too, so use BSD File to be sure which it is.
format_ = run_bsd_file(filepath, log)
if not format_ and is_excel(filepath, log):
format_ = {'format': 'XLS'}
elif mime_type == 'application/octet-stream':
# Excel files sometimes come up as this
if is_excel(filepath, log):
format_ = {'format': 'XLS'}
else:
# e.g. Shapefile
format_ = run_bsd_file(filepath, log)
if not format_:
with open(filepath) as f:
buf = f.read(500)
format_ = is_html(buf, log)
elif mime_type == 'text/html':
# Magic can mistake IATI for HTML
with open(filepath) as f:
buf = f.read(100)
if is_iati(buf, log):
format_ = {'format': 'IATI'}
if format_:
return format_
format_tuple = ckan_helpers.resource_formats().get(mime_type)
if format_tuple:
format_ = {'format': format_tuple[1]}
if not format_:
if mime_type.startswith('text/'):
# is it JSON?
with open(filepath, 'rU') as f:
buf = f.read(10000)
if is_json(buf, log):
format_ = {'format': 'JSON'}
# is it CSV?
elif is_csv(buf, log):
format_ = {'format': 'CSV'}
elif is_psv(buf, log):
format_ = {'format': 'PSV'}
if not format_:
log.warning('Mimetype not recognised by CKAN as a data format: %s',
mime_type)
if format_:
log.info('Mimetype translates to filetype: %s', format_['format'])
if format_['format'] == 'TXT':
# is it JSON?
with open(filepath, 'rU') as f:
buf = f.read(10000)
if is_json(buf, log):
format_ = {'format': 'JSON'}
# is it CSV?
elif is_csv(buf, log):
format_ = {'format': 'CSV'}
elif is_psv(buf, log):
format_ = {'format': 'PSV'}
# XML files without the "<?xml ... ?>" tag end up here
elif is_xml_but_without_declaration(buf, log):
format_ = get_xml_variant_without_xml_declaration(buf, log)
elif is_ttl(buf, log):
format_ = {'format': 'TTL'}
elif format_['format'] == 'HTML':
# maybe it has RDFa in it
with open(filepath) as f:
buf = f.read(100000)
if has_rdfa(buf, log):
format_ = {'format': 'RDFa'}
else:
# Excel files sometimes not picked up by magic, so try alternative
if is_excel(filepath, log):
format_ = {'format': 'XLS'}
# BSD file picks up some files that Magic misses
# e.g. some MS Word files
if not format_:
format_ = run_bsd_file(filepath, log)
if not format_:
log.warning('Could not detect format of file: %s', filepath)
return format_
top_level_tag_name = top_level_tag_name.replace('rdf:rdf', 'rdf')
top_level_tag_name = top_level_tag_name.replace('wms_capabilities',
'wms') # WMS 1.3
top_level_tag_name = top_level_tag_name.replace('wmt_ms_capabilities',
'wms') # WMS 1.1.1
top_level_tag_name = re.sub('wfs:.*', 'wfs', top_level_tag_name) # WFS 2.0
top_level_tag_name = top_level_tag_name.replace('wfs_capabilities',
'wfs') # WFS 1.0/1.1
top_level_tag_name = top_level_tag_name.replace('feed', 'atom feed')
if top_level_tag_name.lower() == 'capabilities' and \
'xmlns="http://www.opengis.net/wmts/' in buf:
top_level_tag_name = 'wmts'
if top_level_tag_name.lower() in ('coveragedescriptions', 'capabilities') and \
'xmlns="http://www.opengis.net/wcs/' in buf:
top_level_tag_name = 'wcs'
format_tuple = ckan_helpers.resource_formats().get(top_level_tag_name)
if format_tuple:
format_ = {'format': format_tuple[1]}
log.info('XML variant detected: %s', format_tuple[2])
return format_
log.warning('Did not recognise XML format: %s', top_level_tag_name)
return {'format': 'XML'}
def has_rdfa(buf, log):
'''If the buffer HTML contains RDFa then this returns True'''
# quick check for the key words
if 'about=' not in buf or 'property=' not in buf:
log.debug('Not RDFA')
return False
def sniff_file_format(filepath, log):
'''For a given filepath, work out what file format it is.
Returns a dict with format as a string, which is the format's canonical
shortname (as defined by ckan's resource_formats.json) and a key that says
if it is contained in a zip or something.
e.g. {'format': 'CSV',
'container': 'zip',
}
or None if it can\'t tell what it is.
Note, log is a logger, either a Celery one or a standard Python logging
one.
'''
format_ = None
log.info('Sniffing file format of: %s', filepath)
filepath_utf8 = filepath.encode('utf8') if isinstance(filepath, unicode) \
else filepath
mime_type = magic.from_file(filepath_utf8, mime=True)
log.info('Magic detects file as: %s', mime_type)
if mime_type:
if mime_type == 'application/xml':
with open(filepath) as f:
buf = f.read(5000)
format_ = get_xml_variant_including_xml_declaration(buf, log)
elif mime_type == 'application/zip':
format_ = get_zipped_format(filepath, log)
elif mime_type in ('application/msword', 'application/vnd.ms-office'):
# In the past Magic gives the msword mime-type for Word and other
# MS Office files too, so use BSD File to be sure which it is.
format_ = run_bsd_file(filepath, log)
if not format_ and is_excel(filepath, log):
format_ = {'format': 'XLS'}
elif mime_type == 'application/octet-stream':
# Excel files sometimes come up as this
if is_excel(filepath, log):
format_ = {'format': 'XLS'}
else:
# e.g. Shapefile
format_ = run_bsd_file(filepath, log)
if not format_:
with open(filepath) as f:
buf = f.read(500)
format_ = is_html(buf, log)
elif mime_type == 'text/html':
# Magic can mistake IATI for HTML
with open(filepath) as f:
buf = f.read(100)
if is_iati(buf, log):
format_ = {'format': 'IATI'}
if format_:
return format_
format_tuple = ckan_helpers.resource_formats().get(mime_type)
if format_tuple:
format_ = {'format': format_tuple[1]}
if not format_:
if mime_type.startswith('text/'):
# is it JSON?
with open(filepath, 'rU') as f:
buf = f.read(10000)
if is_json(buf, log):
format_ = {'format': 'JSON'}
# is it CSV?
elif is_csv(buf, log):
format_ = {'format': 'CSV'}
elif is_psv(buf, log):
format_ = {'format': 'PSV'}
if not format_:
log.warning('Mimetype not recognised by CKAN as a data format: %s',
mime_type)
if format_:
log.info('Mimetype translates to filetype: %s',
format_['format'])
if format_['format'] == 'TXT':
# is it JSON?
with open(filepath, 'rU') as f:
buf = f.read(10000)
if is_json(buf, log):
format_ = {'format': 'JSON'}
# is it CSV?
elif is_csv(buf, log):
format_ = {'format': 'CSV'}
elif is_psv(buf, log):
format_ = {'format': 'PSV'}
# XML files without the "<?xml ... ?>" tag end up here
elif is_xml_but_without_declaration(buf, log):
format_ = get_xml_variant_without_xml_declaration(buf, log)
elif is_ttl(buf, log):
format_ = {'format': 'TTL'}
elif format_['format'] == 'HTML':
# maybe it has RDFa in it
with open(filepath) as f:
buf = f.read(100000)
if has_rdfa(buf, log):
format_ = {'format': 'RDFa'}
else:
# Excel files sometimes not picked up by magic, so try alternative
if is_excel(filepath, log):
format_ = {'format': 'XLS'}
# BSD file picks up some files that Magic misses
# e.g. some MS Word files
if not format_:
format_ = run_bsd_file(filepath, log)
if not format_:
log.warning('Could not detect format of file: %s', filepath)
return format_
filenames = zip.namelist()
finally:
zip.close()
except zipfile.BadZipfile, e:
log.info('Zip file open raised error %s: %s',
e, e.args)
return
except Exception, e:
log.warning('Zip file open raised exception %s: %s',
e, e.args)
return
top_score = 0
top_scoring_extension_counts = defaultdict(int) # extension: number_of_files
for filename in filenames:
extension = os.path.splitext(filename)[-1][1:].lower()
format_tuple = ckan_helpers.resource_formats().get(extension)
if format_tuple:
score = lib.resource_format_scores().get(format_tuple[1])
if score is not None and score > top_score:
top_score = score
top_scoring_extension_counts = defaultdict(int)
if score == top_score:
top_scoring_extension_counts[extension] += 1
else:
log.info('Zipped file of unknown extension: "%s" (%s)', extension, filepath)
if not top_scoring_extension_counts:
log.info('Zip has no known extensions: %s', filepath)
return {'format': 'ZIP'}
top_scoring_extension_counts = sorted(top_scoring_extension_counts.items(),
key=lambda x: x[1])
def _distribution_format(self, distribution, normalize_ckan_format=True):
'''
Returns the Internet Media Type and format label for a distribution
Given a reference (URIRef or BNode) to a dcat:Distribution, it will
try to extract the media type (previously knowm as MIME type), eg
`text/csv`, and the format label, eg `CSV`
Values for the media type will be checked in the following order:
1. literal value of dcat:mediaType
2. literal value of dct:format if it contains a '/' character
3. value of dct:format if it is an instance of dct:IMT, eg:
<dct:format>
<dct:IMT rdf:value="text/html" rdfs:label="HTML"/>
</dct:format>
Values for the label will be checked in the following order:
1. literal value of dct:format if it not contains a '/' character
2. label of dct:format if it is an instance of dct:IMT (see above)
If `normalize_ckan_format` is True and using CKAN>=2.3, the label will
be tried to match against the standard list of formats that is included
with CKAN core
(https://github.com/ckan/ckan/blob/master/ckan/config/resource_formats.json)
This allows for instance to populate the CKAN resource format field
with a format that view plugins, etc will understand (`csv`, `xml`,
etc.)
Return a tuple with the media type and the label, both set to None if
they couldn't be found.
'''
imt = None
label = None
imt = self._object_value(distribution, DCAT.mediaType)
_format = self._object(distribution, DCT['format'])
if isinstance(_format, Literal):
if not imt and '/' in _format:
imt = unicode(_format)
else:
label = unicode(_format)
elif isinstance(_format, (BNode, URIRef)):
if self._object(_format, RDF.type) == DCT.IMT:
if not imt:
imt = unicode(self.g.value(_format, default=None))
label = unicode(self.g.label(_format, default=None))
if ((imt or label) and normalize_ckan_format and
toolkit.check_ckan_version(min_version='2.3')):
import ckan.config
from ckan.lib import helpers
format_registry = helpers.resource_formats()
if imt in format_registry:
label = format_registry[imt][1]
elif label in format_registry:
label = format_registry[label][1]
return imt, label
return {'format': 'XML'}
log.info('Top level tag detected as: %s', top_level_tag_name)
top_level_tag_name = top_level_tag_name.replace('rdf:rdf', 'rdf')
top_level_tag_name = top_level_tag_name.replace('wms_capabilities', 'wms') # WMS 1.3
top_level_tag_name = top_level_tag_name.replace('wmt_ms_capabilities', 'wms') # WMS 1.1.1
top_level_tag_name = re.sub('wfs:.*', 'wfs', top_level_tag_name) # WFS 2.0
top_level_tag_name = top_level_tag_name.replace('wfs_capabilities', 'wfs') # WFS 1.0/1.1
top_level_tag_name = top_level_tag_name.replace('feed', 'atom feed')
if top_level_tag_name.lower() == 'capabilities' and \
'xmlns="http://www.opengis.net/wmts/' in buf:
top_level_tag_name = 'wmts'
if top_level_tag_name.lower() in ('coveragedescriptions', 'capabilities') and \
'xmlns="http://www.opengis.net/wcs/' in buf:
top_level_tag_name = 'wcs'
format_tuple = ckan_helpers.resource_formats().get(top_level_tag_name)
if format_tuple:
format_ = {'format': format_tuple[1]}
log.info('XML variant detected: %s', format_tuple[2])
return format_
log.warning('Did not recognise XML format: %s', top_level_tag_name)
return {'format': 'XML'}
def has_rdfa(buf, log):
'''If the buffer HTML contains RDFa then this returns True'''
# quick check for the key words
if 'about=' not in buf or 'property=' not in buf:
log.debug('Not RDFA')
return False
# more rigorous check for them as tag attributes
def get_package_dict(self, harvest_object, package_dict_defaults,
source_config, existing_dataset):
'''
Constructs a package_dict suitable to be passed to package_create or
package_update. See documentation on
ckan.logic.action.create.package_create for more details
* name - a new package must have a unique name; if it had a name in the
previous harvest, that will be in the package_dict_defaults.
* resource.id - should be the same as the old object if updating a
package
* errors - call self._save_object_error() and return False
* default values for name, owner_org, tags etc can be merged in using:
package_dict = package_dict_defaults.merge(package_dict_harvested)
'''
import ckanext.dgu.lib.theme as dgutheme
from ckan.lib.helpers import resource_formats
from ckan import model
from ckanext.harvest.model import (HarvestObjectExtra as HOExtra,
HarvestGatherError)
res_formats = resource_formats()
inv_dataset = InventoryDocument.dataset_to_dict(
InventoryDocument.parse_xml_string(harvest_object.content))
pkg = dict(title=inv_dataset['title'],
notes=inv_dataset['description'],
state='active' if inv_dataset['active'] else 'deleted',
resources=[],
extras={
self.IDENTIFIER_KEY: inv_dataset['identifier'],
'harvest_source_reference': harvest_object.guid
})
# License
rights = inv_dataset.get('rights')
if rights:
license_id, licence = \
dgu_helpers.get_licence_fields_from_free_text(rights)
pkg['license_id'] = license_id
if licence:
pkg['extras']['licence'] = licence
log.info('Custom licence %r', rights)
else:
pkg['license_id'] = ''
# Resources
inv_resources = [r for r in inv_dataset['resources'] if r['active']]
existing_resource_urls = dict((r.url, r.id)
for r in existing_dataset.resources) \
if existing_dataset else {}
pkg['resources'] = []
for inv_resource in inv_resources:
format_ = res_formats.get(inv_resource['mimetype'].lower().strip())
if format_:
format_ = format_[1]
else:
format_ = inv_resource['mimetype']
description = inv_resource['title']
if inv_resource['availability']:
description += ' - %s' % inv_resource['availability']
# if it is temporal, it should be a timeseries,
# if it is not data, it should be an additional resource
resource_type = 'file' if inv_resource['resource_type'] == 'Data' \
else 'documentation'
# Schema
if inv_resource['conforms_to']:
schema_url = inv_resource['conforms_to']
schema_type = SCHEMA_TYPE_MAP.get(format_)
else:
schema_url = schema_type = ''
res = {
'url': inv_resource['url'],
'format': format_,
'description': description,
'resource_type': resource_type,
'schema-url': schema_url,
'schema-type': schema_type,
}
if res['url'] in existing_resource_urls:
res['id'] = existing_resource_urls[res['url']]
pkg['resources'].append(res)
# Local Authority Services and Functions
if inv_dataset['services']:
log.info('Local Authority Services: %r', inv_dataset['services'])
# e.g. {http://id.esd.org.uk/service/190}
pkg['extras']['la_service'] = ' '.join(inv_dataset['services'])
else:
pkg['extras']['la_service'] = ''
if inv_dataset['functions']:
log.info('Local Authority Functions %r', inv_dataset['functions'])
pkg['extras']['la_function'] = ' '.join(inv_dataset['functions'])
else:
pkg['extras']['la_function'] = ''
pkg = package_dict_defaults.merge(pkg)
if not pkg.get('name'):
# append the publisher name to differentiate similar titles better
# than just a numbers suffix
publisher = model.Group.get(harvest_object.job.source.publisher_id)
publisher_abbrev = self._get_publisher_abbreviation(publisher)
pkg['name'] = self._gen_new_name('%s %s' %
(pkg['title'], publisher_abbrev))
# Themes based on services/functions
if 'tags' not in pkg:
pkg['tags'] = []
try:
themes = dgutheme.categorize_package(pkg)
log.debug('%s given themes: %r', pkg['name'], themes)
except ImportError, e:
log.debug('Theme cannot be given: %s', e)
themes = []
def get_zipped_format(filepath):
'''For a given zip file, return the format of file inside.
For multiple files, choose by the most open, and then by the most
popular extension.'''
# just check filename extension of each file inside
try:
# note: Cannot use "with" with a zipfile before python 2.7
# so we have to close it manually.
zip = zipfile.ZipFile(filepath, 'r')
try:
filepaths = zip.namelist()
finally:
zip.close()
except zipfile.BadZipfile as e:
log.info('Zip file open raised error %s: %s', e, e.args)
return
except Exception as e:
log.warning('Zip file open raised exception %s: %s', e, e.args)
return
# Shapefile check - a Shapefile is a zip containing specific files:
# .shp, .dbf and .shx amongst others
extensions = set([f.split('.')[-1].lower() for f in filepaths])
if len(extensions & set(('shp', 'dbf', 'shx'))) == 3:
log.info('Shapefile detected')
return {'format': 'SHP'}
# GTFS check - a GTFS is a zip which containing specific filenames
filenames = set((os.path.basename(f) for f in filepaths))
if not (set(('agency.txt', 'stops.txt', 'routes.txt', 'trips.txt',
'stop_times.txt', 'calendar.txt')) - set(filenames)):
log.info('GTFS detected')
return {'format': 'GTFS'}
top_score = 0
top_scoring_extension_counts = defaultdict(
int) # extension: number_of_files
for filepath in filepaths:
extension = os.path.splitext(filepath)[-1][1:].lower()
format_tuple = ckan_helpers.resource_formats().get(extension)
if format_tuple:
score = lib.resource_format_scores().get(format_tuple[1])
if score is not None and score > top_score:
top_score = score
top_scoring_extension_counts = defaultdict(int)
if score == top_score:
top_scoring_extension_counts[extension] += 1
else:
log.info('Zipped file of unknown extension: "%s" (%s)', extension,
filepath)
if not top_scoring_extension_counts:
log.info('Zip has no known extensions: %s', filepath)
return {'format': 'ZIP'}
top_scoring_extension_counts = sorted(top_scoring_extension_counts.items(),
key=lambda x: x[1])
top_extension = top_scoring_extension_counts[-1][0]
log.info('Zip file\'s most popular extension is "%s" (All extensions: %r)',
top_extension, top_scoring_extension_counts)
format_tuple = ckan_helpers.resource_formats()[top_extension]
format_ = {'format': format_tuple[1], 'container': 'ZIP'}
log.info('Zipped file format detected: %s', format_tuple[2])
return format_
try:
filenames = zip.namelist()
finally:
zip.close()
except zipfile.BadZipfile, e:
log.info('Zip file open raised error %s: %s', e, e.args)
return
except Exception, e:
log.warning('Zip file open raised exception %s: %s', e, e.args)
return
top_score = 0
top_scoring_extension_counts = defaultdict(
int) # extension: number_of_files
for filename in filenames:
extension = os.path.splitext(filename)[-1][1:].lower()
format_tuple = ckan_helpers.resource_formats().get(extension)
if format_tuple:
score = lib.resource_format_scores().get(format_tuple[1])
if score is not None and score > top_score:
top_score = score
top_scoring_extension_counts = defaultdict(int)
if score == top_score:
top_scoring_extension_counts[extension] += 1
else:
log.info('Zipped file of unknown extension: "%s" (%s)', extension,
filepath)
if not top_scoring_extension_counts:
log.info('Zip has no known extensions: %s', filepath)
return {'format': 'ZIP'}
top_scoring_extension_counts = sorted(top_scoring_extension_counts.items(),
def _distribution_format(self, distribution, normalize_ckan_format=True):
'''
Returns the Internet Media Type and format label for a distribution
Given a reference (URIRef or BNode) to a dcat:Distribution, it will
try to extract the media type (previously knowm as MIME type), eg
`text/csv`, and the format label, eg `CSV`
Values for the media type will be checked in the following order:
1. literal value of dcat:mediaType
2. literal value of dct:format if it contains a '/' character
3. value of dct:format if it is an instance of dct:IMT, eg:
<dct:format>
<dct:IMT rdf:value="text/html" rdfs:label="HTML"/>
</dct:format>
Values for the label will be checked in the following order:
1. literal value of dct:format if it not contains a '/' character
2. label of dct:format if it is an instance of dct:IMT (see above)
If `normalize_ckan_format` is True and using CKAN>=2.3, the label will
be tried to match against the standard list of formats that is included
with CKAN core
(https://github.com/ckan/ckan/blob/master/ckan/config/resource_formats.json)
This allows for instance to populate the CKAN resource format field
with a format that view plugins, etc will understand (`csv`, `xml`,
etc.)
Return a tuple with the media type and the label, both set to None if
they couldn't be found.
'''
imt = None
label = None
imt = self._object_value(distribution, DCAT.mediaType)
_format = self._object(distribution, DCT['format'])
if isinstance(_format, Literal):
if not imt and '/' in _format:
imt = unicode(_format)
else:
label = unicode(_format)
elif isinstance(_format, (BNode, URIRef)):
if self._object(_format, RDF.type) == DCT.IMT:
if not imt:
imt = unicode(self.g.value(_format, default=None))
label = unicode(self.g.label(_format, default=None))
if ((imt or label) and normalize_ckan_format and
toolkit.check_ckan_version(min_version='2.3')):
import ckan.config
from ckan.lib import helpers
format_registry = helpers.resource_formats()
if imt in format_registry:
label = format_registry[imt][1]
elif label in format_registry:
label = format_registry[label][1]
return imt, label
def format_mapping(self):
try:
tk.check_access('sysadmin', {'user': g.user, model: model})
except tk.NotAuthorized:
return tk.abort(403)
if request.method == 'POST':
old = request.POST.get('from')
new = request.POST.get('to')
if old and new:
ids = set()
res_query = model.Session.query(model.Resource).filter_by(
format=old, state='active'
)
for res in res_query:
ids.add(res.package_id)
res_query.update({'format': new})
model.Session.commit()
for id in ids:
clear(id)
rebuild(id, defer_commit=True)
commit()
tk.h.flash_success(
'Updated. Records changed: {}'.format(len(ids))
)
return tk.redirect_to('format_mapping')
defined = set(
map(lambda (_1, fmt, _3): fmt,
h.resource_formats().values())
)
db_formats = model.Session.query(
model.Resource.format, func.count(model.Resource.id),
func.count(model.PackageExtra.value)
).outerjoin(
model.PackageExtra,
(model.Resource.package_id == model.PackageExtra.package_id)
& ((model.PackageExtra.key == 'harvest_portal')
| (model.PackageExtra.key.is_(None)))
).group_by(model.Resource.format).filter(
model.Resource.format != '', model.Resource.state == 'active'
)
db_formats = db_formats.all()
format_types = {
f: {
True: 'Partially external',
e == 0: 'Local',
t - e == 0: 'External'
}[True]
for (f, t, e) in db_formats
}
used = set(format_types)
undefined = used - defined
extra_vars = {
'undefined': undefined,
'defined': defined,
'format_types': format_types
}
return tk.render('admin/format_mapping.html', extra_vars)
