| #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 | |
| import time | |
| import os | |
| #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(docsdb, url, depth, agencyID): | def fetchURL(docsdb, url, agencyID): |
| hash = hashlib.md5(url).hexdigest() | hash = hashlib.md5(url).hexdigest() |
| req = urllib2.Request(url) | req = urllib2.Request(url) |
| print "Fetching %s", url | print "Fetching %s", url |
| doc = docsdb['hash'] | doc = docsdb.get(hash) |
| if doc == None: | |
| doc = {'_id': hash, 'agencyID': agencyID} | |
| #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) | url_handle = opener.open(req) |
| headers = url_handle.info() # the addinfourls have the .info() too | headers = url_handle.info() # the addinfourls have the .info() too |
| doc['etag'] = headers.getheader("ETag") | doc['etag'] = headers.getheader("ETag") |
| doc['last_modified'] = headers.getheader("Last-Modified") | doc['last_modified'] = headers.getheader("Last-Modified") |
| doc['web_server'] = headers.getheader("Server") | doc['web_server'] = headers.getheader("Server") |
| doc['powered_by'] = headers.getheader("X-Powered-By") | |
| doc['file_size'] = headers.getheader("Content-Length") | doc['file_size'] = headers.getheader("Content-Length") |
| doc['mime_type'] = headers.getheader("Content-Type") | doc['mime_type'] = headers.getheader("Content-Type").split(";")[0] |
| if hasattr(url_handle, 'code'): | 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 | |
| else: | else: |
| #do scraping | content = url_handle.read() |
| html = url_handle.read() | docsdb.save(doc) |
| doc = docsdb.get(hash) # need to get a _rev | |
| docsdb.put_attachment(doc, content, str(time.time())+"-"+os.path.basename(url), doc['mime_type']) | |
| return (doc['mime_type'], content) | |
| #store as attachment epoch-filename | |
| else: | |
| print "error %s in downloading %s", url_handle.code, URL | |
| #record/alert error to error database | |
| def scrapeAndStore(docsdb, url, depth, agencyID): | |
| (mime_type,content) = fetchURL(docsdb, url, agencyID) | |
| if content != None: | |
| 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(html) | soup = BeautifulSoup(content) |
| links = soup.findAll('a') # soup.findAll('a', id=re.compile("^p-")) | navIDs = soup.findAll(id=re.compile('nav|Nav|menu|bar')) |
| for link in links: | for nav in navIDs: |
| if link.has_key("href"): | print "Removing element", nav['id'] |
| print link['href'] | 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-")) | |
| for link in links: | |
| if link.has_key("href"): | |
| if link['href'].startswith("http"): | |
| linkurl = link['href'] | |
| else: | |
| linkurl = urljoin(url,link['href']) | |
| print linkurl | |
| #for each unique link | #for each unique link |
| # if | |
| #if html mimetype | #if html mimetype |
| # go down X levels, | # go down X levels, |
| # diff with last stored attachment, store in document | # diff with last stored attachment, store in document |
| #if not | #if not |
| # remember to save parentURL and title (link text that lead to document) | # remember to save parentURL and title (link text that lead to document) |
| #store as attachment epoch-filename | |
| else: | |
| print "error %s in downloading %s", url_handle.code, URL | |
| #record/alert error to error database | |
| couch = couchdb.Server('http://127.0.0.1:5984/') | |
| couch = couchdb.Server('http://192.168.1.148:5984/') | |
| # 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']) | scrapeAndStore(docsdb, agency['website'],1,agency['_id']) |