def fetch(url):
result = {}
fetcher = ContentFetcher(url, tried=2)
fetchResult = fetcher.fetch()
content = fetchResult.get('content')
if not content:
return result
try:
htmlelement = lxml.html.fromstring(content)
except Exception:
logging.error('Failed to load html from content.')
return result
match = pyquery.PyQuery(htmlelement)('head meta[name=keywords]')
if match:
mainElement = match[0]
keywords = mainElement.get('content')
if keywords:
result['keywords'] = lxmlutil.getPureString(keywords)
match = pyquery.PyQuery(htmlelement)('head meta[name=description]')
if match:
mainElement = match[0]
description = mainElement.get('content')
if description:
result['description'] = lxmlutil.getPureString(description)
match = pyquery.PyQuery(htmlelement)('head title')
if match:
mainElement = match[0]
title = mainElement.text_content()
if title:
result['title'] = lxmlutil.getPureString(title)
return result
def _fetchContent(data, triedcount, feedback):
fetchurl = data['fetchurl']
header = data.get('header')
encoding = data.get('encoding')
fetcher = ContentFetcher(fetchurl, header=header,
encoding=encoding, tried=triedcount)
fetchResult = fetcher.fetch(feedback)
content = fetchResult.get('content')
urlUsed = fetchResult.get('url')
return urlUsed, content
def post(self):
data = json.loads(self.request.body)
items = data['items']
origin = data['origin']
header = data.get('header')
for item in items:
url = item.get('url')
if not url:
continue
fetcher = ContentFetcher(url, header=header,
tried=2)
fetchResult = fetcher.fetch()
usedUrl = fetchResult.get('url')
content = fetchResult.get('content')
if not content:
logging.error('Failed to get content from %s.' % (url, ))
continue
item['url'] = usedUrl
try:
editorFormat = globalconfig.getEditorFormat()
page = pageanalyst.analyse(usedUrl, content,
editorFormat=editorFormat, monitorTitle=item.get('title'))
if not item.get('title') and page.get('title'):
item['title'] = page['title']
if not item.get('published') and page.get('published') \
and not page['published'].endswith('0000'):
# if no hour, minute, published is not precise enough
item['published'] = page['published']
if origin.get('timezone'):
item['published'] = dateutil.adjustDate14(item['published'], origin['timezone'])
if not item.get('content') and page.get('content'):
item['content'] = page['content']
if not item.get('img') and page.get('images'):
item['img'] = page['images'][0]
except Exception:
logging.exception('Error happens when analyse %s.' % (usedUrl, ))
responseData = {
'origin': data['origin'],
'items': items,
}
self.response.headers['Content-Type'] = 'text/plain'
callbackurl = data['callbackurl']
success = networkutil.postData(callbackurl, responseData,
trycount=_CALLBACK_TRYCOUNT, timeout=_URL_TIMEOUT)
if success:
message = 'Push items back for %s to %s.' % (data['origin'], callbackurl)
else:
message = 'Failed to push items back for %s to %s.' % (data['origin'], callbackurl)
logging.info(message)
self.response.out.write(message)
def _fetchContent(data, triedcount, feedback):
fetchurl = data['fetchurl']
header = data.get('header')
encoding = data.get('encoding')
fetcher = ContentFetcher(fetchurl,
header=header,
encoding=encoding,
tried=triedcount)
fetchResult = fetcher.fetch(feedback)
content = fetchResult.get('content')
urlUsed = fetchResult.get('url')
return urlUsed, content
def fetch(url):
parseresult = urlparse.urlparse(url)
queryurl = 'http://data.alexa.com/data?cli=10&url=%s' % (parseresult.netloc, )
result = {}
fetcher = ContentFetcher(queryurl, tried=2)
fetchResult = fetcher.fetch()
content = fetchResult.get('content')
if not content:
return result
tree = lxmlutil.parseFromUnicode(content)
alexa = getAlexaInfo(tree)
if alexa:
result['alexa'] = alexa
dmoz = getDmozInfo(tree)
if dmoz:
result['dmoz'] = dmoz
return result
def _detectDetailUrl(url, title):
tried = 2
fetcher = ContentFetcher(url,tried=tried)
fetchResult = fetcher.fetch()
content = fetchResult.get('content')
if not content:
return None
docelement = lxml.html.fromstring(content)
aElements = pyquery.PyQuery(docelement)('a')
for aElement in aElements:
if lxmlutil.getCleanText(aElement) != title:
continue
detailUrl = aElement.get('href')
if detailUrl:
detailUrl = urlparse.urljoin(url, detailUrl)
return detailUrl
return None
def _detectDetailUrl(url, title):
tried = 2
fetcher = ContentFetcher(url, tried=tried)
fetchResult = fetcher.fetch()
content = fetchResult.get('content')
if not content:
return None
docelement = lxml.html.fromstring(content)
aElements = pyquery.PyQuery(docelement)('a')
for aElement in aElements:
if lxmlutil.getCleanText(aElement) != title:
continue
detailUrl = aElement.get('href')
if detailUrl:
detailUrl = urlparse.urljoin(url, detailUrl)
return detailUrl
return None
def get(self):
url = self.request.get('url')
page = None
if url:
try:
url = base64.b64decode(url)
url2 = ''
length = len(url)
for i in range(0, length, 2):
if i + 1 < length:
url2 += url[i+1] + url[i]
if length % 2 != 0:
url2 += url[-1]
url = url2
except TypeError:
pass
key = stringutil.calculateHash([url])
page = memcache.get(key)
contentGot = bool(page)
if not page:
tried = 2 # the max try count is 3
fetcher = ContentFetcher(url, tried=tried)
fetchResult = fetcher.fetch()
content = fetchResult.get('content')
if content:
editorFormat = globalconfig.getEditorFormat()
page = pageanalyst.analyse(url, content, editorFormat=editorFormat)
if page:
page['url'] = url
if page and (page.get('content') or page.get('images')):
memcache.set(key, page)
contentGot = True
if not contentGot:
page = {'url': url}
self.redirect(url, permanent=True)
return
if 'images' in page:
for image in page['images']:
image['url'] = '/image/?url=' + urllib.quote(image['url'].encode('utf-8'))
templateValues = {
'page': page,
}
self.render(templateValues, 'home.html')
def post(self):
url = self.request.get('url')
title = self.request.get('title')
fetchResult = {}
content = None
page = None
fortest = bool(self.request.get('fortest'))
httpheader = self.request.get('httpheader')
header = None
if httpheader:
header = json.loads(httpheader)
if url:
tried = 2 # the max try count is 3
fetcher = ContentFetcher(url,
header=header,
tried=tried
)
fetchResult = fetcher.fetch()
content = fetchResult.get('content')
elementResult = {}
if content:
editorFormat = globalconfig.getEditorFormat()
page = pageanalyst.analyse(url, content, editorFormat=editorFormat,
monitorTitle=title, fortest=fortest, elementResult=elementResult)
if header:
httpheader = jsonutil.getReadableString(header)
templateValues = {
'url': url,
'title': title,
'fortest': fortest,
'httpheader': httpheader,
'encoding': fetchResult.get('encoding'),
'encodingSrc': fetchResult.get('encoding.src'),
'oldContent': fetchResult.get('content.old'),
'content': fetchResult.get('content'),
'pagestr': jsonutil.getReadableString(page),
'page': page,
'elementResult': elementResult,
}
self.render(templateValues, 'test.html')
"""
Fetch the url provided and retrieve links, subsequently fetching
the pages at those links until reaching limit (or running out of links).
:param start_url: url to start from
:param limit: number of urls to return in list
:return: list of urls discovered
"""
urls = [start_url]
seen = {start_url: True}
count = 1
while len(urls) > 0 and count < limit:
url = urls.pop()
contents = self.content_fetcher.retrieve_page(url)
new_urls = filter(lambda x: x not in seen, extract_urls(url, contents))
for new_url in new_urls:
if count == limit:
break
urls.append(new_url)
seen[new_url] = True
count += 1
return list(seen.keys())
if __name__ == "__main__":
parser = setup_argument_parser()
args = parser.parse_args()
web_crawler = WebCrawler(ContentFetcher(args.agents))
found_urls = web_crawler.discover(args.url, limit=args.limit)
for url in found_urls:
print(url)
def post(self):
action = self.request.get('action')
keyword = ''
pageinfo = None
if action == 'JSON':
jsonstr = self.request.get('jsonstr')
if jsonstr:
newssource = json.loads(jsonstr)
else:
newssource = _DEFAULT_NEWSSOURCE
encodingUsed = ''
urlUsed = ''
content = ''
httpheader = ''
formatter = ''
else:
keyword = self.request.get('keyword').strip()
pageinfo = self.request.get('pageinfo').strip()
if pageinfo:
pageinfo = json.loads(pageinfo)
newssource = {}
newssource['active'] = bool(self.request.get('active'))
newssource['slug'] = self.request.get('slug')
newssource['name'] = self.request.get('name')
newssource['order'] = self.request.get('order')
newssource['charts'] = bool(self.request.get('charts'))
newssource['fetchurl'] = self.request.get('fetchurl')
if newssource['fetchurl'] and not newssource['fetchurl'].startswith('http'):
newssource['fetchurl'] = 'http://' + newssource['fetchurl']
if not newssource['slug'] and newssource['fetchurl']:
newssource['slug'] = urlparse.urlparse(newssource['fetchurl']).netloc
httpheader = self.request.get('httpheader')
if httpheader:
newssource['header'] = json.loads(httpheader)
newssource['encoding'] = self.request.get('encoding')
newssource['tags'] = self.request.get('tags')
# following fields only for showing parsed result.
encodingUsed = self.request.get('encodingUsed')
urlUsed = self.request.get('urlUsed')
oldContent = self.request.get('oldContent')
newssource['selector'] = self.request.get('selector').strip()
conditions = {}
conditions['returnall'] = bool(self.request.get('returnall'))
conditions['emptytitle'] = bool(self.request.get('emptytitle'))
conditions['detectdetail'] = bool(self.request.get('detectdetail'))
conditions['scripttext'] = bool(self.request.get('scripttext'))
excludeselector = self.request.get('excludeselector').strip()
if excludeselector:
if 'exclude' not in conditions:
conditions['exclude'] = {}
conditions['exclude']['selector'] = excludeselector
includeselector = self.request.get('includeselector').strip()
if includeselector:
if 'include' not in conditions:
conditions['include'] = {}
conditions['include']['selector'] = includeselector
urlselector = self.request.get('urlselector').strip()
titleselector = self.request.get('titleselector').strip()
imageselector = self.request.get('imageselector').strip()
contentselector = self.request.get('contentselector').strip()
linkselector = self.request.get('linkselector').strip()
imagelinkselector = self.request.get('imagelinkselector').strip()
if urlselector or titleselector or contentselector or \
imageselector or linkselector or imagelinkselector:
conditions['criterion'] = {}
if urlselector:
conditions['criterion']['url'] = urlselector
if titleselector:
conditions['criterion']['title'] = titleselector
if contentselector:
conditions['criterion']['content'] = contentselector
if imageselector:
conditions['criterion']['image'] = imageselector
if linkselector:
conditions['criterion']['link'] = linkselector
if imagelinkselector:
conditions['criterion']['imagelink'] = imagelinkselector
newssource['conditions'] = conditions
formatter = self.request.get('formatter')
if formatter:
newssource['formatter'] = json.loads(formatter)
newssource['description'] = self.request.get('description').strip()
content = self.request.get('content')
jsonstr = jsonutil.getReadableString(newssource)
if 'active' not in newssource:
newssource['active'] = True
items = []
links = []
selector = newssource.get('selector')
fetchurl = newssource.get('fetchurl')
tried = 2 # the max try count is 3
if not content and fetchurl:
fetcher = ContentFetcher(fetchurl,
header=newssource.get('header'),
encoding=newssource.get('encoding'), tried=tried
)
fetchResult = fetcher.fetch()
content = fetchResult.get('content')
oldContent = fetchResult.get('content.old')
urlUsed = fetchResult.get('url')
encodingUsed = '%s-%s' % (fetchResult.get('encoding'),
fetchResult.get('encoding.src'))
if content:
content = lxmlutil.removeEncodingDeclaration(content)
if selector:
parser = HtmlContentParser()
items = parser.parse(urlUsed, content, selector,
newssource.get('conditions'), newssource.get('formatter'))
else:
links = linkdetector.detect(content, keyword)
if items and newssource.get('conditions', {}).get('detectdetail'):
detaildetector.populateDetailUrls(items)
if newssource.get('header'):
httpheader = jsonutil.getReadableString(newssource['header'])
if newssource.get('formatter'):
formatter = jsonutil.getReadableString(newssource['formatter'])
if not pageinfo and fetchurl:
pageinfo = pmapi.getPage(fetchurl)
templateValues = {
'newssource': newssource,
'httpheader': httpheader,
'formatter': formatter,
'content': content,
'oldContent': oldContent,
'encodingUsed': encodingUsed,
'urlUsed': urlUsed,
'keyword': keyword,
'links': links,
'items': items,
'jsonstr': jsonstr,
'pageinfo': pageinfo,
'strpageinfo': json.dumps(pageinfo),
}
self._render(templateValues)
class TestContentFetcher(unittest.TestCase):
user_agents = ["Mozilla", "Python", "Something Else"]
url = "https://crawler-test.com/"
def setUp(self) -> None:
self.content_fetcher = ContentFetcher(self.user_agents)
def test_get_next_user_agent_cycles_through_agents(self):
self.assertEqual(self.content_fetcher.get_next_user_agent(), "Mozilla")
self.assertEqual(self.content_fetcher.get_next_user_agent(), "Python")
self.assertEqual(self.content_fetcher.get_next_user_agent(),
"Something Else")
self.assertEqual(self.content_fetcher.get_next_user_agent(), "Mozilla")
def test_get_next_user_agent_cycles_returns_none_when_none_given(self):
content_fetcher_no_agents = ContentFetcher([])
self.assertIsNone(content_fetcher_no_agents.get_next_user_agent())
def test_construct_request_adds_correct_headers(self):
request = self.content_fetcher.construct_request(self.url)
self.assertEqual(request.get_header("User-agent"), "Mozilla")
self.assertEqual(request.get_header("Accept-encoding"),
"gzip, deflate")
self.assertEqual(request.get_full_url(), self.url)
self.assertEqual(request.get_header("Accept"), "text/html")
def test_decompress_content_handles_gzip(self):
test_bytes = "Compress me".encode('utf-8')
compressed_data = gzip.compress(test_bytes)
self.assertEqual(
self.content_fetcher.decompress_content(compressed_data, "gzip"),
test_bytes)
def test_decompress_content_handles_deflate(self):
test_bytes = "Compress me".encode('utf-8')
compressed_data = zlib.compress(test_bytes)
self.assertEqual(
self.content_fetcher.decompress_content(compressed_data,
"deflate"), test_bytes)
def test_decompress_content_recovers_when_unknown_format(self):
test_bytes = "Compress me".encode('utf-8')
compressed_data = zlib.compress(test_bytes)
self.assertEqual(
self.content_fetcher.decompress_content(compressed_data,
"unknown"),
''.encode('utf-8'))
def test_handle_response_can_handle_gzip_content(self):
test_string = "Compress me"
compressed_data = gzip.compress(test_string.encode('utf-8'))
headers = [("Content-Encoding", "gzip")]
self.assertEqual(
self.content_fetcher.handle_response(headers, compressed_data),
test_string)
def test_handle_response_can_handle_deflate_content(self):
test_string = "Compress me"
compressed_data = zlib.compress(test_string.encode('utf-8'))
headers = [("Content-Encoding", "deflate")]
self.assertEqual(
self.content_fetcher.handle_response(headers, compressed_data),
test_string)
def test_get_next_user_agent_cycles_returns_none_when_none_given(self):
content_fetcher_no_agents = ContentFetcher([])
self.assertIsNone(content_fetcher_no_agents.get_next_user_agent())
def setUp(self) -> None:
self.content_fetcher = ContentFetcher(self.user_agents)
def post(self):
action = self.request.get('action')
keyword = ''
pageinfo = None
if action == 'JSON':
jsonstr = self.request.get('jsonstr')
if jsonstr:
newssource = json.loads(jsonstr)
else:
newssource = _DEFAULT_NEWSSOURCE
encodingUsed = ''
urlUsed = ''
content = ''
httpheader = ''
formatter = ''
else:
keyword = self.request.get('keyword').strip()
pageinfo = self.request.get('pageinfo').strip()
if pageinfo:
pageinfo = json.loads(pageinfo)
newssource = {}
newssource['active'] = bool(self.request.get('active'))
newssource['slug'] = self.request.get('slug')
newssource['name'] = self.request.get('name')
newssource['order'] = self.request.get('order')
newssource['charts'] = bool(self.request.get('charts'))
newssource['fetchurl'] = self.request.get('fetchurl')
if newssource['fetchurl'] and not newssource[
'fetchurl'].startswith('http'):
newssource['fetchurl'] = 'http://' + newssource['fetchurl']
if not newssource['slug'] and newssource['fetchurl']:
newssource['slug'] = urlparse.urlparse(
newssource['fetchurl']).netloc
httpheader = self.request.get('httpheader')
if httpheader:
newssource['header'] = json.loads(httpheader)
newssource['encoding'] = self.request.get('encoding')
newssource['tags'] = self.request.get('tags')
# following fields only for showing parsed result.
encodingUsed = self.request.get('encodingUsed')
urlUsed = self.request.get('urlUsed')
oldContent = self.request.get('oldContent')
newssource['selector'] = self.request.get('selector').strip()
conditions = {}
conditions['returnall'] = bool(self.request.get('returnall'))
conditions['emptytitle'] = bool(self.request.get('emptytitle'))
conditions['detectdetail'] = bool(self.request.get('detectdetail'))
conditions['scripttext'] = bool(self.request.get('scripttext'))
excludeselector = self.request.get('excludeselector').strip()
if excludeselector:
if 'exclude' not in conditions:
conditions['exclude'] = {}
conditions['exclude']['selector'] = excludeselector
includeselector = self.request.get('includeselector').strip()
if includeselector:
if 'include' not in conditions:
conditions['include'] = {}
conditions['include']['selector'] = includeselector
urlselector = self.request.get('urlselector').strip()
titleselector = self.request.get('titleselector').strip()
imageselector = self.request.get('imageselector').strip()
contentselector = self.request.get('contentselector').strip()
linkselector = self.request.get('linkselector').strip()
imagelinkselector = self.request.get('imagelinkselector').strip()
if urlselector or titleselector or contentselector or \
imageselector or linkselector or imagelinkselector:
conditions['criterion'] = {}
if urlselector:
conditions['criterion']['url'] = urlselector
if titleselector:
conditions['criterion']['title'] = titleselector
if contentselector:
conditions['criterion']['content'] = contentselector
if imageselector:
conditions['criterion']['image'] = imageselector
if linkselector:
conditions['criterion']['link'] = linkselector
if imagelinkselector:
conditions['criterion']['imagelink'] = imagelinkselector
newssource['conditions'] = conditions
formatter = self.request.get('formatter')
if formatter:
newssource['formatter'] = json.loads(formatter)
newssource['description'] = self.request.get('description').strip()
content = self.request.get('content')
jsonstr = jsonutil.getReadableString(newssource)
if 'active' not in newssource:
newssource['active'] = True
items = []
links = []
selector = newssource.get('selector')
fetchurl = newssource.get('fetchurl')
tried = 2 # the max try count is 3
if not content and fetchurl:
fetcher = ContentFetcher(fetchurl,
header=newssource.get('header'),
encoding=newssource.get('encoding'),
tried=tried)
fetchResult = fetcher.fetch()
content = fetchResult.get('content')
oldContent = fetchResult.get('content.old')
urlUsed = fetchResult.get('url')
encodingUsed = '%s-%s' % (fetchResult.get('encoding'),
fetchResult.get('encoding.src'))
if content:
content = lxmlutil.removeEncodingDeclaration(content)
if selector:
parser = HtmlContentParser()
items = parser.parse(urlUsed, content, selector,
newssource.get('conditions'),
newssource.get('formatter'))
else:
links = linkdetector.detect(content, keyword)
if items and newssource.get('conditions', {}).get('detectdetail'):
detaildetector.populateDetailUrls(items)
if newssource.get('header'):
httpheader = jsonutil.getReadableString(newssource['header'])
if newssource.get('formatter'):
formatter = jsonutil.getReadableString(newssource['formatter'])
if not pageinfo and fetchurl:
pageinfo = pmapi.getPage(fetchurl)
templateValues = {
'newssource': newssource,
'httpheader': httpheader,
'formatter': formatter,
'content': content,
'oldContent': oldContent,
'encodingUsed': encodingUsed,
'urlUsed': urlUsed,
'keyword': keyword,
'links': links,
'items': items,
'jsonstr': jsonstr,
'pageinfo': pageinfo,
'strpageinfo': json.dumps(pageinfo),
}
self._render(templateValues)
