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#http://packages.python.org/CouchDB/client.html |
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import couchdb |
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import urllib2 |
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from BeautifulSoup import BeautifulSoup |
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import re |
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import hashlib |
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from urlparse import urljoin |
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import time |
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import os |
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import mimetypes |
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import re |
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import urllib |
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import urlparse |
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|
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def canonurl(url): |
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r"""Return the canonical, ASCII-encoded form of a UTF-8 encoded URL, or '' |
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if the URL looks invalid. |
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>>> canonurl('\xe2\x9e\xa1.ws') # tinyarro.ws |
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'http://xn--hgi.ws/' |
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""" |
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# strip spaces at the ends and ensure it's prefixed with 'scheme://' |
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url = url.strip() |
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if not url: |
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return '' |
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if not urlparse.urlsplit(url).scheme: |
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url = 'http://' + url |
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|
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# turn it into Unicode |
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#try: |
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# url = unicode(url, 'utf-8') |
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#except UnicodeDecodeError: |
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# return '' # bad UTF-8 chars in URL |
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|
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# parse the URL into its components |
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parsed = urlparse.urlsplit(url) |
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scheme, netloc, path, query, fragment = parsed |
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|
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# ensure scheme is a letter followed by letters, digits, and '+-.' chars |
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if not re.match(r'[a-z][-+.a-z0-9]*$', scheme, flags=re.I): |
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return '' |
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scheme = str(scheme) |
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|
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# ensure domain and port are valid, eg: sub.domain.<1-to-6-TLD-chars>[:port] |
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match = re.match(r'(.+\.[a-z0-9]{1,6})(:\d{1,5})?$', netloc, flags=re.I) |
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if not match: |
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return '' |
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domain, port = match.groups() |
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netloc = domain + (port if port else '') |
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netloc = netloc.encode('idna') |
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|
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# ensure path is valid and convert Unicode chars to %-encoded |
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if not path: |
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path = '/' # eg: 'http://google.com' -> 'http://google.com/' |
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path = urllib.quote(urllib.unquote(path.encode('utf-8')), safe='/;') |
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|
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# ensure query is valid |
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query = urllib.quote(urllib.unquote(query.encode('utf-8')), safe='=&?/') |
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|
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# ensure fragment is valid |
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fragment = urllib.quote(urllib.unquote(fragment.encode('utf-8'))) |
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|
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# piece it all back together, truncating it to a maximum of 4KB |
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url = urlparse.urlunsplit((scheme, netloc, path, query, fragment)) |
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return url[:4096] |
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|
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#http://diveintopython.org/http_web_services/etags.html |
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class NotModifiedHandler(urllib2.BaseHandler): |
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def http_error_304(self, req, fp, code, message, headers): |
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addinfourl = urllib2.addinfourl(fp, headers, req.get_full_url()) |
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addinfourl.code = code |
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return addinfourl |
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|
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def fetchURL(docsdb, url, fieldName, agencyID, scrape_again=True): |
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url = canonurl(url) |
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hash = hashlib.md5(url).hexdigest().encode("utf-8") |
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req = urllib2.Request(url) |
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print "Fetching %s" % url |
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if url.startswith("mailto") or url.startswith("javascript") or url.startswith("#") or url == None or url == "": |
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print "Not a valid HTTP url" |
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return (None,None,None) |
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doc = docsdb.get(hash) |
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if doc == None: |
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doc = {'_id': hash, 'agencyID': agencyID, 'url': url, 'fieldName':fieldName} |
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else: |
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if (('page_scraped' in doc) and (time.time() - doc['page_scraped']) < 999999): |
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print "Uh oh, trying to scrape URL again too soon!" |
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last_attachment_fname = doc["_attachments"].keys()[-1] |
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last_attachment = docsdb.get_attachment(doc,last_attachment_fname) |
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return (doc['url'],doc['mime_type'],last_attachment.read()) |
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if scrape_again == False: |
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print "Not scraping this URL again as requested" |
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return (None,None,None) |
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|
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time.sleep(3) # wait 3 seconds to give webserver time to recover |
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|
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req.add_header("User-Agent", "Mozilla/4.0 (compatible; Prometheus webspider; owner maxious@lambdacomplex.org)") |
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#if there is a previous version stored in couchdb, load caching helper tags |
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if doc.has_key('etag'): |
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req.add_header("If-None-Match", doc['etag']) |
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if doc.has_key('last_modified'): |
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req.add_header("If-Modified-Since", doc['last_modified']) |
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|
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opener = urllib2.build_opener(NotModifiedHandler()) |
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try: |
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url_handle = opener.open(req) |
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doc['url'] = url_handle.geturl() # may have followed a redirect to a new url |
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headers = url_handle.info() # the addinfourls have the .info() too |
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doc['etag'] = headers.getheader("ETag") |
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doc['last_modified'] = headers.getheader("Last-Modified") |
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doc['date'] = headers.getheader("Date") |
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doc['page_scraped'] = time.time() |
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doc['web_server'] = headers.getheader("Server") |
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doc['via'] = headers.getheader("Via") |
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doc['powered_by'] = headers.getheader("X-Powered-By") |
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doc['file_size'] = headers.getheader("Content-Length") |
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content_type = headers.getheader("Content-Type") |
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if content_type != None: |
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doc['mime_type'] = content_type.split(";")[0] |
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else: |
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(type,encoding) = mimetypes.guess_type(url) |
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doc['mime_type'] = type |
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if hasattr(url_handle, 'code'): |
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if url_handle.code == 304: |
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print "the web page has not been modified" |
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return (None,None,None) |
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else: |
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content = url_handle.read() |
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docsdb.save(doc) |
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doc = docsdb.get(hash) # need to get a _rev |
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docsdb.put_attachment(doc, content, str(time.time())+"-"+os.path.basename(url), doc['mime_type']) |
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return (doc['url'], doc['mime_type'], content) |
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#store as attachment epoch-filename |
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except urllib2.URLError as e: |
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error = "" |
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if hasattr(e, 'reason'): |
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error = "error %s in downloading %s" % (str(e.reason), url) |
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elif hasattr(e, 'code'): |
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error = "error %s in downloading %s" % (e.code, url) |
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print error |
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doc['error'] = error |
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docsdb.save(doc) |
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return (None,None,None) |
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|
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|
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|
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def scrapeAndStore(docsdb, url, depth, fieldName, agencyID): |
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(url,mime_type,content) = fetchURL(docsdb, url, fieldName, agencyID) |
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badURLs = ["http://www.ausport.gov.au/supporting/funding/grants_and_scholarships/grant_funding_report"] |
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if content != None and depth > 0 and url != "http://www.ausport.gov.au/supporting/funding/grants_and_scholarships/grant_funding_report": |
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if mime_type == "text/html" or mime_type == "application/xhtml+xml" or mime_type =="application/xml": |
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# http://www.crummy.com/software/BeautifulSoup/documentation.html |
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soup = BeautifulSoup(content) |
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navIDs = soup.findAll(id=re.compile('nav|Nav|menu|bar|left|right|sidebar|more-links|breadcrumb|footer|header')) |
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for nav in navIDs: |
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print "Removing element", nav['id'] |
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nav.extract() |
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navClasses = soup.findAll(attrs={'class' : re.compile('nav|menu|bar|left|right|sidebar|more-links|breadcrumb|footer|header')}) |
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for nav in navClasses: |
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print "Removing element", nav['class'] |
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nav.extract() |
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links = soup.findAll('a') # soup.findAll('a', id=re.compile("^p-")) |
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linkurls = set([]) |
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for link in links: |
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if link.has_key("href"): |
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if link['href'].startswith("http"): |
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# lets not do external links for now |
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# linkurls.add(link['href']) |
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None |
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if link['href'].startswith("mailto"): |
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# not http |
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None |
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if link['href'].startswith("javascript"): |
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# not http |
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None |
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else: |
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# remove anchors and spaces in urls |
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link['href'] = link['href'].replace(" ","%20") |
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link['href'] = re.sub('#.*$','',link['href']) |
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linkurls.add(urljoin(url,link['href'])) |
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for linkurl in linkurls: |
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#print linkurl |
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scrapeAndStore(docsdb, linkurl, depth-1, fieldName, agencyID) |
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|
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couch = couchdb.Server('http://127.0.0.1:5984/') |
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# select database |
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agencydb = couch['disclosr-agencies'] |
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docsdb = couch['disclosr-documents'] |
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|
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if __name__ == "__main__": |
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for row in agencydb.view('app/getScrapeRequired'): #not recently scraped agencies view? |
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agency = agencydb.get(row.id) |
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print agency['name'] |
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for key in agency.keys(): |
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if key == 'website': |
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scrapeAndStore(docsdb, agency[key],0,key,agency['_id']) |
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if key.endswith('URL'): |
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print key |
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depth = 1 |
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if 'scrapeDepth' in agency.keys(): |
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depth = agency['scrapeDepth'] |
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scrapeAndStore(docsdb, agency[key],depth,key,agency['_id']) |
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agency['metadata']['lastScraped'] = time.time() |
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agencydb.save(agency) |
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