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from lxml import html
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from urllib import urlencode
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from urlparse import urlparse, urljoin
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from cgi import escape
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from lxml.etree import _ElementStringResult
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search_url = None
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url_xpath = None
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content_xpath = None
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title_xpath = None
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results_xpath = ''
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def extract_url(xpath_results):
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url = ''
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parsed_search_url = urlparse(search_url)
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if type(xpath_results) == list:
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if not len(xpath_results):
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raise Exception('Empty url resultset')
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if type(xpath_results[0]) == _ElementStringResult:
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url = ''.join(xpath_results)
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if url.startswith('//'):
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url = parsed_search_url.scheme+url
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elif url.startswith('/'):
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url = urljoin(search_url, url)
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#TODO
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else:
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url = xpath_results[0].attrib.get('href')
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else:
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url = xpath_results.attrib.get('href')
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if not url.startswith('http://') or not url.startswith('https://'):
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url = 'http://'+url
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parsed_url = urlparse(url)
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if not parsed_url.netloc:
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raise Exception('Cannot parse url')
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if not parsed_url.path:
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url += '/'
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return url
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def request(query, params):
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query = urlencode({'q': query})[2:]
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params['url'] = search_url.format(query=query)
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params['query'] = query
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return params
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def response(resp):
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results = []
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dom = html.fromstring(resp.text)
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query = resp.search_params['query']
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if results_xpath:
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for result in dom.xpath(results_xpath):
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url = extract_url(result.xpath(url_xpath))
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title = ' '.join(result.xpath(title_xpath))
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content = escape(' '.join(result.xpath(content_xpath))).replace(query, '<b>{0}</b>'.format(query))
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results.append({'url': url, 'title': title, 'content': content})
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else:
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for content, url, title in zip(dom.xpath(content_xpath), map(extract_url, dom.xpath(url_xpath)), dom.xpath(title_xpath)):
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results.append({'url': url, 'title': title, 'content': content})
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return results
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