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