Current File : //usr/lib/calibre/calibre/utils/opensearch/description.py
__license__ = 'GPL 3'
__copyright__ = '''
2011, John Schember <john@nachtimwald.com>,
2006, Ed Summers <ehs@pobox.com>
'''
__docformat__ = 'restructuredtext en'
from contextlib import closing
from calibre import browser
from calibre.utils.xml_parse import safe_xml_fromstring
from calibre.utils.opensearch.url import URL
class Description:
'''
A class for representing OpenSearch Description files.
'''
def __init__(self, url=""):
'''
The constructor which may pass an optional url to load from.
d = Description("http://www.example.com/description")
'''
if url:
self.load(url)
def load(self, url):
'''
For loading up a description object from a url. Normally
you'll probably just want to pass a URL into the constructor.
'''
br = browser()
with closing(br.open(url, timeout=15)) as f:
doc = safe_xml_fromstring(f.read())
# version 1.1 has repeating Url elements.
self.urls = []
for element in doc.xpath('//*[local-name() = "Url"]'):
template = element.get('template')
type = element.get('type')
if template and type:
url = URL()
url.template = template
url.type = type
self.urls.append(url)
# Stanza catalogs.
for element in doc.xpath('//*[local-name() = "link"]'):
if element.get('rel') != 'search':
continue
href = element.get('href')
type = element.get('type')
if href and type:
url = URL()
url.template = href
url.type = type
self.urls.append(url)
# this is version 1.0 specific.
self.url = ''
if not self.urls:
self.url = ''.join(doc.xpath('//*[local-name() = "Url"][1]//text()'))
self.format = ''.join(doc.xpath('//*[local-name() = "Format"][1]//text()'))
self.shortname = ''.join(doc.xpath('//*[local-name() = "ShortName"][1]//text()'))
self.longname = ''.join(doc.xpath('//*[local-name() = "LongName"][1]//text()'))
self.description = ''.join(doc.xpath('//*[local-name() = "Description"][1]//text()'))
self.image = ''.join(doc.xpath('//*[local-name() = "Image"][1]//text()'))
self.sameplesearch = ''.join(doc.xpath('//*[local-name() = "SampleSearch"][1]//text()'))
self.developer = ''.join(doc.xpath('//*[local-name() = "Developer"][1]//text()'))
self.contact = ''.join(doc.xpath('/*[local-name() = "Contact"][1]//text()'))
self.attribution = ''.join(doc.xpath('//*[local-name() = "Attribution"][1]//text()'))
self.syndicationright = ''.join(doc.xpath('//*[local-name() = "SyndicationRight"][1]//text()'))
tag_text = ' '.join(doc.xpath('//*[local-name() = "Tags"]//text()'))
if tag_text is not None:
self.tags = tag_text.split(' ')
self.adultcontent = doc.xpath('boolean(//*[local-name() = "AdultContent" and contains(., "true")])')
def get_url_by_type(self, type):
'''
Walks available urls and returns them by type. Only
appropriate in opensearch v1.1 where there can be multiple
query targets. Returns none if no such type is found.
url = description.get_url_by_type('application/rss+xml')
'''
for url in self.urls:
if url.type == type:
return url
return None
def get_best_template(self):
'''
OK, best is a value judgement, but so be it. You'll get
back either the atom, rss or first template available. This
method handles the main difference between opensearch v1.0 and v1.1
'''
# version 1.0
if self.url:
return self.url
# atom
if self.get_url_by_type('application/atom+xml'):
return self.get_url_by_type('application/atom+xml').template
# rss
if self.get_url_by_type('application/rss+xml'):
return self.get_url_by_type('application/rss+xml').template
# other possible rss type
if self.get_url_by_type('text/xml'):
return self.get_url_by_Type('text/xml').template
# otherwise just the first one
if len(self.urls) > 0:
return self.urls[0].template
# out of luck
return None
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