| #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 | |
| from urlparse import urljoin | |
| import time | |
| import os | |
| import mimetypes | |
| import re | |
| import urllib | |
| import urlparse | |
| couch = couchdb.Server() # Assuming localhost:5984 | def canonurl(url): |
| # If your CouchDB server is running elsewhere, set it up like this: | r"""Return the canonical, ASCII-encoded form of a UTF-8 encoded URL, or '' |
| # couch = couchdb.Server('http://example.com:5984/') | 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 | |
| # select database | # turn it into Unicode |
| agencydb = couch['disclosr-agencies'] | #try: |
| # url = unicode(url, 'utf-8') | |
| #except UnicodeDecodeError: | |
| # return '' # bad UTF-8 chars in URL | |
| for row in agencydb.view('app/getScrapeRequired'): #not recently scraped agencies view? | # parse the URL into its components |
| agency = agencydb.get(row.id) | parsed = urlparse.urlsplit(url) |
| print agency['agencyName'] | 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 scrapeAndStore(URL, depth, agency): | def fetchURL(docsdb, url, fieldName, agencyID, scrape_again=True): |
| URL = "http://www.hole.fi/jajvirta/weblog/" | url = canonurl(url) |
| req = urllib2.Request(URL) | hash = hashlib.md5(url).hexdigest().encode("utf-8") |
| req = urllib2.Request(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) | |
| doc = docsdb.get(hash) | |
| if doc == None: | |
| 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['mime_type'],last_attachment) | |
| if scrape_again == False: | |
| print "Not scraping this URL again as requested" | |
| return (None,None) | |
| time.sleep(3) # wait 3 seconds to give webserver time to recover | |
| #if there is a previous version sotred in couchdb, load caching helper tags | #if there is a previous version stored in couchdb, load caching helper tags |
| if etag: | if doc.has_key('etag'): |
| req.add_header("If-None-Match", etag) | req.add_header("If-None-Match", doc['etag']) |
| if last_modified: | if doc.has_key('last_modified'): |
| req.add_header("If-Modified-Since", 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) |
| etag = headers.getheader("ETag") | headers = url_handle.info() # the addinfourls have the .info() too |
| last_modified = headers.getheader("Last-Modified") | doc['etag'] = headers.getheader("ETag") |
| web_server = headers.getheader("Server") | doc['last_modified'] = headers.getheader("Last-Modified") |
| file_size = headers.getheader("Content-Length") | doc['date'] = headers.getheader("Date") |
| mime_type = headers.getheader("Content-Type") | doc['page_scraped'] = time.time() |
| doc['web_server'] = headers.getheader("Server") | |
| if hasattr(url_handle, 'code') and url_handle.code == 304: | doc['powered_by'] = headers.getheader("X-Powered-By") |
| print "the web page has not been modified" | doc['file_size'] = headers.getheader("Content-Length") |
| else: | content_type = headers.getheader("Content-Type") |
| print "error %s in downloading %s", url_handle.code, URL | if content_type != None: |
| #record/alert error to error database | doc['mime_type'] = content_type.split(";")[0] |
| else: | |
| #do scraping | (type,encoding) = mimetypes.guess_type(url) |
| html = ? | doc['mime_type'] = type |
| # http://www.crummy.com/software/BeautifulSoup/documentation.html | if hasattr(url_handle, 'code'): |
| soup = BeautifulSoup(html) | if url_handle.code == 304: |
| links = soup.findAll('a') # soup.findAll('a', id=re.compile("^p-")) | print "the web page has not been modified" |
| for link in links: | return (None,None) |
| print link['href'] | else: |
| #for each unique link | content = url_handle.read() |
| #if html mimetype | docsdb.save(doc) |
| # go down X levels, | doc = docsdb.get(hash) # need to get a _rev |
| # diff with last stored attachment, store in document | docsdb.put_attachment(doc, content, str(time.time())+"-"+os.path.basename(url), doc['mime_type']) |
| #if not | return (doc['mime_type'], content) |
| # remember to save parentURL and title (link text that lead to document) | #store as attachment epoch-filename |
| except urllib2.URLError as e: | |
| #store as attachment epoch-filename | error = "" |
| 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 | |
| doc['error'] = error | |
| docsdb.save(doc) | |
| return (None,None) | |
| def scrapeAndStore(docsdb, url, depth, fieldName, agencyID): | |
| (mime_type,content) = fetchURL(docsdb, url, fieldName, agencyID) | |
| if content != None and depth > 0: | |
| if mime_type == "text/html" or mime_type == "application/xhtml+xml" or mime_type =="application/xml": | |
| # http://www.crummy.com/software/BeautifulSoup/documentation.html | |
| soup = BeautifulSoup(content) | |
| navIDs = soup.findAll(id=re.compile('nav|Nav|menu|bar')) | |
| for nav in navIDs: | |
| print "Removing element", nav['id'] | |
| nav.extract() | |
| navClasses = soup.findAll(attrs={'class' : re.compile('nav|menu|bar')}) | |
| for nav in navClasses: | |
| print "Removing element", nav['class'] | |
| nav.extract() | |
| links = soup.findAll('a') # soup.findAll('a', id=re.compile("^p-")) | |
| linkurls = set([]) | |
| for link in links: | |
| if link.has_key("href"): | |
| if link['href'].startswith("http"): | |
| # 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: | |
| linkurls.add(urljoin(url,link['href'].replace(" ","%20"))) | |
| for linkurl in linkurls: | |
| #print linkurl | |
| scrapeAndStore(docsdb, linkurl, depth-1, fieldName, agencyID) | |
| couch = couchdb.Server('http://127.0.0.1:5984/') | |
| # select database | |
| agencydb = couch['disclosr-agencies'] | |
| docsdb = couch['disclosr-documents'] | |
| for row in agencydb.view('app/getScrapeRequired'): #not recently scraped agencies view? | |
| agency = agencydb.get(row.id) | |
| print agency['name'] | |
| 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) | |