| #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 mimetypes |
| import re |
import re |
| import urllib |
import urllib |
| import urlparse |
import urlparse |
| |
|
| def mkhash(input): |
def mkhash(input): |
| return hashlib.md5(input).hexdigest().encode("utf-8") |
return hashlib.md5(input).hexdigest().encode("utf-8") |
| |
|
| def canonurl(url): |
def canonurl(url): |
| r"""Return the canonical, ASCII-encoded form of a UTF-8 encoded URL, or '' |
r"""Return the canonical, ASCII-encoded form of a UTF-8 encoded URL, or '' |
| if the URL looks invalid. |
if the URL looks invalid. |
| >>> canonurl('\xe2\x9e\xa1.ws') # tinyarro.ws |
>>> canonurl('\xe2\x9e\xa1.ws') # tinyarro.ws |
| 'http://xn--hgi.ws/' |
'http://xn--hgi.ws/' |
| """ |
""" |
| # strip spaces at the ends and ensure it's prefixed with 'scheme://' |
# strip spaces at the ends and ensure it's prefixed with 'scheme://' |
| url = url.strip() |
url = url.strip() |
| if not url: |
if not url: |
| return '' |
return '' |
| if not urlparse.urlsplit(url).scheme: |
if not urlparse.urlsplit(url).scheme: |
| url = 'http://' + url |
url = 'http://' + url |
| |
|
| # turn it into Unicode |
# turn it into Unicode |
| #try: |
#try: |
| # url = unicode(url, 'utf-8') |
# url = unicode(url, 'utf-8') |
| #except UnicodeDecodeError: |
#except UnicodeDecodeError: |
| # return '' # bad UTF-8 chars in URL |
# return '' # bad UTF-8 chars in URL |
| |
|
| # parse the URL into its components |
# parse the URL into its components |
| parsed = urlparse.urlsplit(url) |
parsed = urlparse.urlsplit(url) |
| scheme, netloc, path, query, fragment = parsed |
scheme, netloc, path, query, fragment = parsed |
| |
|
| # ensure scheme is a letter followed by letters, digits, and '+-.' chars |
# ensure scheme is a letter followed by letters, digits, and '+-.' chars |
| if not re.match(r'[a-z][-+.a-z0-9]*$', scheme, flags=re.I): |
if not re.match(r'[a-z][-+.a-z0-9]*$', scheme, flags=re.I): |
| return '' |
return '' |
| scheme = str(scheme) |
scheme = str(scheme) |
| |
|
| # ensure domain and port are valid, eg: sub.domain.<1-to-6-TLD-chars>[:port] |
# 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})?$', netloc, flags=re.I) |
match = re.match(r'(.+\.[a-z0-9]{1,6})(:\d{1,5})?$', netloc, flags=re.I) |
| if not match: |
if not match: |
| return '' |
return '' |
| domain, port = match.groups() |
domain, port = match.groups() |
| netloc = domain + (port if port else '') |
netloc = domain + (port if port else '') |
| netloc = netloc.encode('idna') |
netloc = netloc.encode('idna') |
| |
|
| # ensure path is valid and convert Unicode chars to %-encoded |
# ensure path is valid and convert Unicode chars to %-encoded |
| if not path: |
if not path: |
| path = '/' # eg: 'http://google.com' -> 'http://google.com/' |
path = '/' # eg: 'http://google.com' -> 'http://google.com/' |
| path = urllib.quote(urllib.unquote(path.encode('utf-8')), safe='/;') |
path = urllib.quote(urllib.unquote(path.encode('utf-8')), safe='/;') |
| |
|
| # ensure query is valid |
# ensure query is valid |
| query = urllib.quote(urllib.unquote(query.encode('utf-8')), safe='=&?/') |
query = urllib.quote(urllib.unquote(query.encode('utf-8')), safe='=&?/') |
| |
|
| # ensure fragment is valid |
# ensure fragment is valid |
| fragment = urllib.quote(urllib.unquote(fragment.encode('utf-8'))) |
fragment = urllib.quote(urllib.unquote(fragment.encode('utf-8'))) |
| |
|
| # piece it all back together, truncating it to a maximum of 4KB |
# piece it all back together, truncating it to a maximum of 4KB |
| url = urlparse.urlunsplit((scheme, netloc, path, query, fragment)) |
url = urlparse.urlunsplit((scheme, netloc, path, query, fragment)) |
| return url[:4096] |
return url[:4096] |
| |
|
| def fullurl(url,href): |
def fullurl(url,href): |
| href = href.replace(" ","%20") |
href = href.replace(" ","%20") |
| href = re.sub('#.*$','',href) |
href = re.sub('#.*$','',href) |
| return urljoin(url,href) |
return urljoin(url,href) |
| |
|
| #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, fieldName, agencyID, scrape_again=True): |
def fetchURL(docsdb, url, fieldName, agencyID, scrape_again=True): |
| url = canonurl(url) |
url = canonurl(url) |
| hash = mkhash(url) |
hash = mkhash(url) |
| 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 == "": |
if url.startswith("mailto") or url.startswith("javascript") or url.startswith("#") or url == None or url == "": |
| print "Not a valid HTTP url" |
print "Not a valid HTTP url" |
| return (None,None,None) |
return (None,None,None) |
| doc = docsdb.get(hash) |
doc = docsdb.get(hash) |
| if doc == None: |
if doc == None: |
| doc = {'_id': hash, 'agencyID': agencyID, 'url': url, 'fieldName':fieldName} |
doc = {'_id': hash, 'agencyID': agencyID, 'url': url, 'fieldName':fieldName} |
| else: |
else: |
| if (('page_scraped' in doc) and (time.time() - doc['page_scraped']) < 60*24*14*1000): |
if (('page_scraped' in doc) and (time.time() - doc['page_scraped']) < 60*24*14*1000): |
| print "Uh oh, trying to scrape URL again too soon!" |
print "Uh oh, trying to scrape URL again too soon!" |
| last_attachment_fname = doc["_attachments"].keys()[-1] |
last_attachment_fname = doc["_attachments"].keys()[-1] |
| last_attachment = docsdb.get_attachment(doc,last_attachment_fname) |
last_attachment = docsdb.get_attachment(doc,last_attachment_fname) |
| return (doc['url'],doc['mime_type'],last_attachment.read()) |
return (doc['url'],doc['mime_type'],last_attachment.read()) |
| if scrape_again == False: |
if scrape_again == False: |
| print "Not scraping this URL again as requested" |
print "Not scraping this URL again as requested" |
| return (None,None,None) |
return (None,None,None) |
| |
|
| time.sleep(3) # wait 3 seconds to give webserver time to recover |
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)") |
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()) |
| try: |
try: |
| url_handle = opener.open(req) |
url_handle = opener.open(req) |
| doc['url'] = url_handle.geturl() # may have followed a redirect to a new url |
doc['url'] = url_handle.geturl() # may have followed a redirect to a new url |
| 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['date'] = headers.getheader("Date") |
doc['date'] = headers.getheader("Date") |
| doc['page_scraped'] = time.time() |
doc['page_scraped'] = time.time() |
| doc['web_server'] = headers.getheader("Server") |
doc['web_server'] = headers.getheader("Server") |
| doc['via'] = headers.getheader("Via") |
doc['via'] = headers.getheader("Via") |
| doc['powered_by'] = headers.getheader("X-Powered-By") |
doc['powered_by'] = headers.getheader("X-Powered-By") |
| doc['file_size'] = headers.getheader("Content-Length") |
doc['file_size'] = headers.getheader("Content-Length") |
| content_type = headers.getheader("Content-Type") |
content_type = headers.getheader("Content-Type") |
| if content_type != None: |
if content_type != None: |
| doc['mime_type'] = content_type.split(";")[0] |
doc['mime_type'] = content_type.split(";")[0] |
| else: |
else: |
| (type,encoding) = mimetypes.guess_type(url) |
(type,encoding) = mimetypes.guess_type(url) |
| doc['mime_type'] = type |
doc['mime_type'] = type |
| 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,None,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['url'], doc['mime_type'], content) |
return (doc['url'], doc['mime_type'], content) |
| #store as attachment epoch-filename |
#store as attachment epoch-filename |
| |
|
| except urllib2.URLError as e: |
except urllib2.URLError as e: |
| error = "" |
error = "" |
| if hasattr(e, 'reason'): |
if hasattr(e, 'reason'): |