| """Open an arbitrary URL. |
| |
| See the following document for more info on URLs: |
| "Names and Addresses, URIs, URLs, URNs, URCs", at |
| http://www.w3.org/pub/WWW/Addressing/Overview.html |
| |
| See also the HTTP spec (from which the error codes are derived): |
| "HTTP - Hypertext Transfer Protocol", at |
| http://www.w3.org/pub/WWW/Protocols/ |
| |
| Related standards and specs: |
| - RFC1808: the "relative URL" spec. (authoritative status) |
| - RFC1738 - the "URL standard". (authoritative status) |
| - RFC1630 - the "URI spec". (informational status) |
| |
| The object returned by URLopener().open(file) will differ per |
| protocol. All you know is that is has methods read(), readline(), |
| readlines(), fileno(), close() and info(). The read*(), fileno() |
| and close() methods work like those of open files. |
| The info() method returns a mimetools.Message object which can be |
| used to query various info about the object, if available. |
| (mimetools.Message objects are queried with the getheader() method.) |
| """ |
| |
| import string |
| import socket |
| import os |
| import time |
| import sys |
| import types |
| |
| __all__ = ["urlopen", "URLopener", "FancyURLopener", "urlretrieve", |
| "urlcleanup", "quote", "quote_plus", "unquote", "unquote_plus", |
| "urlencode", "url2pathname", "pathname2url", "splittag", |
| "localhost", "thishost", "ftperrors", "basejoin", "unwrap", |
| "splittype", "splithost", "splituser", "splitpasswd", "splitport", |
| "splitnport", "splitquery", "splitattr", "splitvalue", |
| "splitgophertype", "getproxies"] |
| |
| __version__ = '1.15' # XXX This version is not always updated :-( |
| |
| MAXFTPCACHE = 10 # Trim the ftp cache beyond this size |
| |
| # Helper for non-unix systems |
| if os.name == 'mac': |
| from macurl2path import url2pathname, pathname2url |
| elif os.name == 'nt': |
| from nturl2path import url2pathname, pathname2url |
| elif os.name == 'riscos': |
| from rourl2path import url2pathname, pathname2url |
| else: |
| def url2pathname(pathname): |
| return unquote(pathname) |
| def pathname2url(pathname): |
| return quote(pathname) |
| |
| # This really consists of two pieces: |
| # (1) a class which handles opening of all sorts of URLs |
| # (plus assorted utilities etc.) |
| # (2) a set of functions for parsing URLs |
| # XXX Should these be separated out into different modules? |
| |
| |
| # Shortcut for basic usage |
| _urlopener = None |
| def urlopen(url, data=None, proxies=None): |
| """urlopen(url [, data]) -> open file-like object""" |
| global _urlopener |
| if proxies is not None: |
| opener = FancyURLopener(proxies=proxies) |
| elif not _urlopener: |
| opener = FancyURLopener() |
| _urlopener = opener |
| else: |
| opener = _urlopener |
| if data is None: |
| return opener.open(url) |
| else: |
| return opener.open(url, data) |
| def urlretrieve(url, filename=None, reporthook=None, data=None): |
| global _urlopener |
| if not _urlopener: |
| _urlopener = FancyURLopener() |
| return _urlopener.retrieve(url, filename, reporthook, data) |
| def urlcleanup(): |
| if _urlopener: |
| _urlopener.cleanup() |
| |
| |
| ftpcache = {} |
| class URLopener: |
| """Class to open URLs. |
| This is a class rather than just a subroutine because we may need |
| more than one set of global protocol-specific options. |
| Note -- this is a base class for those who don't want the |
| automatic handling of errors type 302 (relocated) and 401 |
| (authorization needed).""" |
| |
| __tempfiles = None |
| |
| version = "Python-urllib/%s" % __version__ |
| |
| # Constructor |
| def __init__(self, proxies=None, **x509): |
| if proxies is None: |
| proxies = getproxies() |
| assert hasattr(proxies, 'has_key'), "proxies must be a mapping" |
| self.proxies = proxies |
| self.key_file = x509.get('key_file') |
| self.cert_file = x509.get('cert_file') |
| self.addheaders = [('User-agent', self.version)] |
| self.__tempfiles = [] |
| self.__unlink = os.unlink # See cleanup() |
| self.tempcache = None |
| # Undocumented feature: if you assign {} to tempcache, |
| # it is used to cache files retrieved with |
| # self.retrieve(). This is not enabled by default |
| # since it does not work for changing documents (and I |
| # haven't got the logic to check expiration headers |
| # yet). |
| self.ftpcache = ftpcache |
| # Undocumented feature: you can use a different |
| # ftp cache by assigning to the .ftpcache member; |
| # in case you want logically independent URL openers |
| # XXX This is not threadsafe. Bah. |
| |
| def __del__(self): |
| self.close() |
| |
| def close(self): |
| self.cleanup() |
| |
| def cleanup(self): |
| # This code sometimes runs when the rest of this module |
| # has already been deleted, so it can't use any globals |
| # or import anything. |
| if self.__tempfiles: |
| for file in self.__tempfiles: |
| try: |
| self.__unlink(file) |
| except OSError: |
| pass |
| del self.__tempfiles[:] |
| if self.tempcache: |
| self.tempcache.clear() |
| |
| def addheader(self, *args): |
| """Add a header to be used by the HTTP interface only |
| e.g. u.addheader('Accept', 'sound/basic')""" |
| self.addheaders.append(args) |
| |
| # External interface |
| def open(self, fullurl, data=None): |
| """Use URLopener().open(file) instead of open(file, 'r').""" |
| fullurl = unwrap(toBytes(fullurl)) |
| if self.tempcache and self.tempcache.has_key(fullurl): |
| filename, headers = self.tempcache[fullurl] |
| fp = open(filename, 'rb') |
| return addinfourl(fp, headers, fullurl) |
| urltype, url = splittype(fullurl) |
| if not urltype: |
| urltype = 'file' |
| if self.proxies.has_key(urltype): |
| proxy = self.proxies[urltype] |
| urltype, proxyhost = splittype(proxy) |
| host, selector = splithost(proxyhost) |
| url = (host, fullurl) # Signal special case to open_*() |
| else: |
| proxy = None |
| name = 'open_' + urltype |
| self.type = urltype |
| if '-' in name: |
| # replace - with _ |
| name = '_'.join(name.split('-')) |
| if not hasattr(self, name): |
| if proxy: |
| return self.open_unknown_proxy(proxy, fullurl, data) |
| else: |
| return self.open_unknown(fullurl, data) |
| try: |
| if data is None: |
| return getattr(self, name)(url) |
| else: |
| return getattr(self, name)(url, data) |
| except socket.error, msg: |
| raise IOError, ('socket error', msg), sys.exc_info()[2] |
| |
| def open_unknown(self, fullurl, data=None): |
| """Overridable interface to open unknown URL type.""" |
| type, url = splittype(fullurl) |
| raise IOError, ('url error', 'unknown url type', type) |
| |
| def open_unknown_proxy(self, proxy, fullurl, data=None): |
| """Overridable interface to open unknown URL type.""" |
| type, url = splittype(fullurl) |
| raise IOError, ('url error', 'invalid proxy for %s' % type, proxy) |
| |
| # External interface |
| def retrieve(self, url, filename=None, reporthook=None, data=None): |
| """retrieve(url) returns (filename, None) for a local object |
| or (tempfilename, headers) for a remote object.""" |
| url = unwrap(toBytes(url)) |
| if self.tempcache and self.tempcache.has_key(url): |
| return self.tempcache[url] |
| type, url1 = splittype(url) |
| if not filename and (not type or type == 'file'): |
| try: |
| fp = self.open_local_file(url1) |
| hdrs = fp.info() |
| del fp |
| return url2pathname(splithost(url1)[1]), hdrs |
| except IOError, msg: |
| pass |
| fp = self.open(url, data) |
| headers = fp.info() |
| if not filename: |
| import tempfile |
| garbage, path = splittype(url) |
| garbage, path = splithost(path or "") |
| path, garbage = splitquery(path or "") |
| path, garbage = splitattr(path or "") |
| suffix = os.path.splitext(path)[1] |
| filename = tempfile.mktemp(suffix) |
| self.__tempfiles.append(filename) |
| result = filename, headers |
| if self.tempcache is not None: |
| self.tempcache[url] = result |
| tfp = open(filename, 'wb') |
| bs = 1024*8 |
| size = -1 |
| blocknum = 1 |
| if reporthook: |
| if headers.has_key("content-length"): |
| size = int(headers["Content-Length"]) |
| reporthook(0, bs, size) |
| block = fp.read(bs) |
| if reporthook: |
| reporthook(1, bs, size) |
| while block: |
| tfp.write(block) |
| block = fp.read(bs) |
| blocknum = blocknum + 1 |
| if reporthook: |
| reporthook(blocknum, bs, size) |
| fp.close() |
| tfp.close() |
| del fp |
| del tfp |
| return result |
| |
| # Each method named open_<type> knows how to open that type of URL |
| |
| def open_http(self, url, data=None): |
| """Use HTTP protocol.""" |
| import httplib |
| user_passwd = None |
| if type(url) is types.StringType: |
| host, selector = splithost(url) |
| if host: |
| user_passwd, host = splituser(host) |
| host = unquote(host) |
| realhost = host |
| else: |
| host, selector = url |
| urltype, rest = splittype(selector) |
| url = rest |
| user_passwd = None |
| if urltype.lower() != 'http': |
| realhost = None |
| else: |
| realhost, rest = splithost(rest) |
| if realhost: |
| user_passwd, realhost = splituser(realhost) |
| if user_passwd: |
| selector = "%s://%s%s" % (urltype, realhost, rest) |
| if proxy_bypass(realhost): |
| host = realhost |
| |
| #print "proxy via http:", host, selector |
| if not host: raise IOError, ('http error', 'no host given') |
| if user_passwd: |
| import base64 |
| auth = base64.encodestring(user_passwd).strip() |
| else: |
| auth = None |
| h = httplib.HTTP(host) |
| if data is not None: |
| h.putrequest('POST', selector) |
| h.putheader('Content-type', 'application/x-www-form-urlencoded') |
| h.putheader('Content-length', '%d' % len(data)) |
| else: |
| h.putrequest('GET', selector) |
| if auth: h.putheader('Authorization', 'Basic %s' % auth) |
| if realhost: h.putheader('Host', realhost) |
| for args in self.addheaders: apply(h.putheader, args) |
| h.endheaders() |
| if data is not None: |
| h.send(data) |
| errcode, errmsg, headers = h.getreply() |
| fp = h.getfile() |
| if errcode == 200: |
| return addinfourl(fp, headers, "http:" + url) |
| else: |
| if data is None: |
| return self.http_error(url, fp, errcode, errmsg, headers) |
| else: |
| return self.http_error(url, fp, errcode, errmsg, headers, data) |
| |
| def http_error(self, url, fp, errcode, errmsg, headers, data=None): |
| """Handle http errors. |
| Derived class can override this, or provide specific handlers |
| named http_error_DDD where DDD is the 3-digit error code.""" |
| # First check if there's a specific handler for this error |
| name = 'http_error_%d' % errcode |
| if hasattr(self, name): |
| method = getattr(self, name) |
| if data is None: |
| result = method(url, fp, errcode, errmsg, headers) |
| else: |
| result = method(url, fp, errcode, errmsg, headers, data) |
| if result: return result |
| return self.http_error_default(url, fp, errcode, errmsg, headers) |
| |
| def http_error_default(self, url, fp, errcode, errmsg, headers): |
| """Default error handler: close the connection and raise IOError.""" |
| void = fp.read() |
| fp.close() |
| raise IOError, ('http error', errcode, errmsg, headers) |
| |
| if hasattr(socket, "ssl"): |
| def open_https(self, url, data=None): |
| """Use HTTPS protocol.""" |
| import httplib |
| user_passwd = None |
| if type(url) is types.StringType: |
| host, selector = splithost(url) |
| if host: |
| user_passwd, host = splituser(host) |
| host = unquote(host) |
| realhost = host |
| else: |
| host, selector = url |
| urltype, rest = splittype(selector) |
| url = rest |
| user_passwd = None |
| if urltype.lower() != 'https': |
| realhost = None |
| else: |
| realhost, rest = splithost(rest) |
| if realhost: |
| user_passwd, realhost = splituser(realhost) |
| if user_passwd: |
| selector = "%s://%s%s" % (urltype, realhost, rest) |
| #print "proxy via https:", host, selector |
| if not host: raise IOError, ('https error', 'no host given') |
| if user_passwd: |
| import base64 |
| auth = base64.encodestring(user_passwd).strip() |
| else: |
| auth = None |
| h = httplib.HTTPS(host, 0, |
| key_file=self.key_file, |
| cert_file=self.cert_file) |
| if data is not None: |
| h.putrequest('POST', selector) |
| h.putheader('Content-type', |
| 'application/x-www-form-urlencoded') |
| h.putheader('Content-length', '%d' % len(data)) |
| else: |
| h.putrequest('GET', selector) |
| if auth: h.putheader('Authorization: Basic %s' % auth) |
| if realhost: h.putheader('Host', realhost) |
| for args in self.addheaders: apply(h.putheader, args) |
| h.endheaders() |
| if data is not None: |
| h.send(data) |
| errcode, errmsg, headers = h.getreply() |
| fp = h.getfile() |
| if errcode == 200: |
| return addinfourl(fp, headers, "https:" + url) |
| else: |
| if data is None: |
| return self.http_error(url, fp, errcode, errmsg, headers) |
| else: |
| return self.http_error(url, fp, errcode, errmsg, headers, |
| data) |
| |
| def open_gopher(self, url): |
| """Use Gopher protocol.""" |
| import gopherlib |
| host, selector = splithost(url) |
| if not host: raise IOError, ('gopher error', 'no host given') |
| host = unquote(host) |
| type, selector = splitgophertype(selector) |
| selector, query = splitquery(selector) |
| selector = unquote(selector) |
| if query: |
| query = unquote(query) |
| fp = gopherlib.send_query(selector, query, host) |
| else: |
| fp = gopherlib.send_selector(selector, host) |
| return addinfourl(fp, noheaders(), "gopher:" + url) |
| |
| def open_file(self, url): |
| """Use local file or FTP depending on form of URL.""" |
| if url[:2] == '//' and url[2:3] != '/': |
| return self.open_ftp(url) |
| else: |
| return self.open_local_file(url) |
| |
| def open_local_file(self, url): |
| """Use local file.""" |
| import mimetypes, mimetools, rfc822, StringIO |
| host, file = splithost(url) |
| localname = url2pathname(file) |
| try: |
| stats = os.stat(localname) |
| except OSError, e: |
| raise IOError(e.errno, e.strerror, e.filename) |
| size = stats.st_size |
| modified = rfc822.formatdate(stats.st_mtime) |
| mtype = mimetypes.guess_type(url)[0] |
| headers = mimetools.Message(StringIO.StringIO( |
| 'Content-Type: %s\nContent-Length: %d\nLast-modified: %s\n' % |
| (mtype or 'text/plain', size, modified))) |
| if not host: |
| urlfile = file |
| if file[:1] == '/': |
| urlfile = 'file://' + file |
| return addinfourl(open(localname, 'rb'), |
| headers, urlfile) |
| host, port = splitport(host) |
| if not port \ |
| and socket.gethostbyname(host) in (localhost(), thishost()): |
| urlfile = file |
| if file[:1] == '/': |
| urlfile = 'file://' + file |
| return addinfourl(open(localname, 'rb'), |
| headers, urlfile) |
| raise IOError, ('local file error', 'not on local host') |
| |
| def open_ftp(self, url): |
| """Use FTP protocol.""" |
| import mimetypes, mimetools, StringIO |
| host, path = splithost(url) |
| if not host: raise IOError, ('ftp error', 'no host given') |
| host, port = splitport(host) |
| user, host = splituser(host) |
| if user: user, passwd = splitpasswd(user) |
| else: passwd = None |
| host = unquote(host) |
| user = unquote(user or '') |
| passwd = unquote(passwd or '') |
| host = socket.gethostbyname(host) |
| if not port: |
| import ftplib |
| port = ftplib.FTP_PORT |
| else: |
| port = int(port) |
| path, attrs = splitattr(path) |
| path = unquote(path) |
| dirs = path.split('/') |
| dirs, file = dirs[:-1], dirs[-1] |
| if dirs and not dirs[0]: dirs = dirs[1:] |
| if dirs and not dirs[0]: dirs[0] = '/' |
| key = user, host, port, '/'.join(dirs) |
| # XXX thread unsafe! |
| if len(self.ftpcache) > MAXFTPCACHE: |
| # Prune the cache, rather arbitrarily |
| for k in self.ftpcache.keys(): |
| if k != key: |
| v = self.ftpcache[k] |
| del self.ftpcache[k] |
| v.close() |
| try: |
| if not self.ftpcache.has_key(key): |
| self.ftpcache[key] = \ |
| ftpwrapper(user, passwd, host, port, dirs) |
| if not file: type = 'D' |
| else: type = 'I' |
| for attr in attrs: |
| attr, value = splitvalue(attr) |
| if attr.lower() == 'type' and \ |
| value in ('a', 'A', 'i', 'I', 'd', 'D'): |
| type = value.upper() |
| (fp, retrlen) = self.ftpcache[key].retrfile(file, type) |
| mtype = mimetypes.guess_type("ftp:" + url)[0] |
| headers = "" |
| if mtype: |
| headers += "Content-Type: %s\n" % mtype |
| if retrlen is not None and retrlen >= 0: |
| headers += "Content-Length: %d\n" % retrlen |
| headers = mimetools.Message(StringIO.StringIO(headers)) |
| return addinfourl(fp, headers, "ftp:" + url) |
| except ftperrors(), msg: |
| raise IOError, ('ftp error', msg), sys.exc_info()[2] |
| |
| def open_data(self, url, data=None): |
| """Use "data" URL.""" |
| # ignore POSTed data |
| # |
| # syntax of data URLs: |
| # dataurl := "data:" [ mediatype ] [ ";base64" ] "," data |
| # mediatype := [ type "/" subtype ] *( ";" parameter ) |
| # data := *urlchar |
| # parameter := attribute "=" value |
| import StringIO, mimetools |
| try: |
| [type, data] = url.split(',', 1) |
| except ValueError: |
| raise IOError, ('data error', 'bad data URL') |
| if not type: |
| type = 'text/plain;charset=US-ASCII' |
| semi = type.rfind(';') |
| if semi >= 0 and '=' not in type[semi:]: |
| encoding = type[semi+1:] |
| type = type[:semi] |
| else: |
| encoding = '' |
| msg = [] |
| msg.append('Date: %s'%time.strftime('%a, %d %b %Y %T GMT', |
| time.gmtime(time.time()))) |
| msg.append('Content-type: %s' % type) |
| if encoding == 'base64': |
| import base64 |
| data = base64.decodestring(data) |
| else: |
| data = unquote(data) |
| msg.append('Content-length: %d' % len(data)) |
| msg.append('') |
| msg.append(data) |
| msg = '\n'.join(msg) |
| f = StringIO.StringIO(msg) |
| headers = mimetools.Message(f, 0) |
| f.fileno = None # needed for addinfourl |
| return addinfourl(f, headers, url) |
| |
| |
| class FancyURLopener(URLopener): |
| """Derived class with handlers for errors we can handle (perhaps).""" |
| |
| def __init__(self, *args): |
| apply(URLopener.__init__, (self,) + args) |
| self.auth_cache = {} |
| self.tries = 0 |
| self.maxtries = 10 |
| |
| def http_error_default(self, url, fp, errcode, errmsg, headers): |
| """Default error handling -- don't raise an exception.""" |
| return addinfourl(fp, headers, "http:" + url) |
| |
| def http_error_302(self, url, fp, errcode, errmsg, headers, data=None): |
| """Error 302 -- relocated (temporarily).""" |
| self.tries += 1 |
| if self.maxtries and self.tries >= self.maxtries: |
| if hasattr(self, "http_error_500"): |
| meth = self.http_error_500 |
| else: |
| meth = self.http_error_default |
| self.tries = 0 |
| return meth(url, fp, 500, |
| "Internal Server Error: Redirect Recursion", headers) |
| result = self.redirect_internal(url, fp, errcode, errmsg, headers, |
| data) |
| self.tries = 0 |
| return result |
| |
| def redirect_internal(self, url, fp, errcode, errmsg, headers, data): |
| if headers.has_key('location'): |
| newurl = headers['location'] |
| elif headers.has_key('uri'): |
| newurl = headers['uri'] |
| else: |
| return |
| void = fp.read() |
| fp.close() |
| # In case the server sent a relative URL, join with original: |
| newurl = basejoin(self.type + ":" + url, newurl) |
| if data is None: |
| return self.open(newurl) |
| else: |
| return self.open(newurl, data) |
| |
| def http_error_301(self, url, fp, errcode, errmsg, headers, data=None): |
| """Error 301 -- also relocated (permanently).""" |
| return self.http_error_302(url, fp, errcode, errmsg, headers, data) |
| |
| def http_error_401(self, url, fp, errcode, errmsg, headers, data=None): |
| """Error 401 -- authentication required. |
| See this URL for a description of the basic authentication scheme: |
| http://www.ics.uci.edu/pub/ietf/http/draft-ietf-http-v10-spec-00.txt""" |
| if not headers.has_key('www-authenticate'): |
| URLopener.http_error_default(self, url, fp, |
| errcode, errmsg, headers) |
| stuff = headers['www-authenticate'] |
| import re |
| match = re.match('[ \t]*([^ \t]+)[ \t]+realm="([^"]*)"', stuff) |
| if not match: |
| URLopener.http_error_default(self, url, fp, |
| errcode, errmsg, headers) |
| scheme, realm = match.groups() |
| if scheme.lower() != 'basic': |
| URLopener.http_error_default(self, url, fp, |
| errcode, errmsg, headers) |
| name = 'retry_' + self.type + '_basic_auth' |
| if data is None: |
| return getattr(self,name)(url, realm) |
| else: |
| return getattr(self,name)(url, realm, data) |
| |
| def retry_http_basic_auth(self, url, realm, data=None): |
| host, selector = splithost(url) |
| i = host.find('@') + 1 |
| host = host[i:] |
| user, passwd = self.get_user_passwd(host, realm, i) |
| if not (user or passwd): return None |
| host = quote(user, safe='') + ':' + quote(passwd, safe='') + '@' + host |
| newurl = 'http://' + host + selector |
| if data is None: |
| return self.open(newurl) |
| else: |
| return self.open(newurl, data) |
| |
| def retry_https_basic_auth(self, url, realm, data=None): |
| host, selector = splithost(url) |
| i = host.find('@') + 1 |
| host = host[i:] |
| user, passwd = self.get_user_passwd(host, realm, i) |
| if not (user or passwd): return None |
| host = quote(user, safe='') + ':' + quote(passwd, safe='') + '@' + host |
| newurl = '//' + host + selector |
| return self.open_https(newurl, data) |
| |
| def get_user_passwd(self, host, realm, clear_cache = 0): |
| key = realm + '@' + host.lower() |
| if self.auth_cache.has_key(key): |
| if clear_cache: |
| del self.auth_cache[key] |
| else: |
| return self.auth_cache[key] |
| user, passwd = self.prompt_user_passwd(host, realm) |
| if user or passwd: self.auth_cache[key] = (user, passwd) |
| return user, passwd |
| |
| def prompt_user_passwd(self, host, realm): |
| """Override this in a GUI environment!""" |
| import getpass |
| try: |
| user = raw_input("Enter username for %s at %s: " % (realm, |
| host)) |
| passwd = getpass.getpass("Enter password for %s in %s at %s: " % |
| (user, realm, host)) |
| return user, passwd |
| except KeyboardInterrupt: |
| print |
| return None, None |
| |
| |
| # Utility functions |
| |
| _localhost = None |
| def localhost(): |
| """Return the IP address of the magic hostname 'localhost'.""" |
| global _localhost |
| if not _localhost: |
| _localhost = socket.gethostbyname('localhost') |
| return _localhost |
| |
| _thishost = None |
| def thishost(): |
| """Return the IP address of the current host.""" |
| global _thishost |
| if not _thishost: |
| _thishost = socket.gethostbyname(socket.gethostname()) |
| return _thishost |
| |
| _ftperrors = None |
| def ftperrors(): |
| """Return the set of errors raised by the FTP class.""" |
| global _ftperrors |
| if not _ftperrors: |
| import ftplib |
| _ftperrors = ftplib.all_errors |
| return _ftperrors |
| |
| _noheaders = None |
| def noheaders(): |
| """Return an empty mimetools.Message object.""" |
| global _noheaders |
| if not _noheaders: |
| import mimetools |
| import StringIO |
| _noheaders = mimetools.Message(StringIO.StringIO(), 0) |
| _noheaders.fp.close() # Recycle file descriptor |
| return _noheaders |
| |
| |
| # Utility classes |
| |
| class ftpwrapper: |
| """Class used by open_ftp() for cache of open FTP connections.""" |
| |
| def __init__(self, user, passwd, host, port, dirs): |
| self.user = user |
| self.passwd = passwd |
| self.host = host |
| self.port = port |
| self.dirs = dirs |
| self.init() |
| |
| def init(self): |
| import ftplib |
| self.busy = 0 |
| self.ftp = ftplib.FTP() |
| self.ftp.connect(self.host, self.port) |
| self.ftp.login(self.user, self.passwd) |
| for dir in self.dirs: |
| self.ftp.cwd(dir) |
| |
| def retrfile(self, file, type): |
| import ftplib |
| self.endtransfer() |
| if type in ('d', 'D'): cmd = 'TYPE A'; isdir = 1 |
| else: cmd = 'TYPE ' + type; isdir = 0 |
| try: |
| self.ftp.voidcmd(cmd) |
| except ftplib.all_errors: |
| self.init() |
| self.ftp.voidcmd(cmd) |
| conn = None |
| if file and not isdir: |
| # Use nlst to see if the file exists at all |
| try: |
| self.ftp.nlst(file) |
| except ftplib.error_perm, reason: |
| raise IOError, ('ftp error', reason), sys.exc_info()[2] |
| # Restore the transfer mode! |
| self.ftp.voidcmd(cmd) |
| # Try to retrieve as a file |
| try: |
| cmd = 'RETR ' + file |
| conn = self.ftp.ntransfercmd(cmd) |
| except ftplib.error_perm, reason: |
| if str(reason)[:3] != '550': |
| raise IOError, ('ftp error', reason), sys.exc_info()[2] |
| if not conn: |
| # Set transfer mode to ASCII! |
| self.ftp.voidcmd('TYPE A') |
| # Try a directory listing |
| if file: cmd = 'LIST ' + file |
| else: cmd = 'LIST' |
| conn = self.ftp.ntransfercmd(cmd) |
| self.busy = 1 |
| # Pass back both a suitably decorated object and a retrieval length |
| return (addclosehook(conn[0].makefile('rb'), |
| self.endtransfer), conn[1]) |
| def endtransfer(self): |
| if not self.busy: |
| return |
| self.busy = 0 |
| try: |
| self.ftp.voidresp() |
| except ftperrors(): |
| pass |
| |
| def close(self): |
| self.endtransfer() |
| try: |
| self.ftp.close() |
| except ftperrors(): |
| pass |
| |
| class addbase: |
| """Base class for addinfo and addclosehook.""" |
| |
| def __init__(self, fp): |
| self.fp = fp |
| self.read = self.fp.read |
| self.readline = self.fp.readline |
| if hasattr(self.fp, "readlines"): self.readlines = self.fp.readlines |
| if hasattr(self.fp, "fileno"): self.fileno = self.fp.fileno |
| |
| def __repr__(self): |
| return '<%s at %s whose fp = %s>' % (self.__class__.__name__, |
| `id(self)`, `self.fp`) |
| |
| def close(self): |
| self.read = None |
| self.readline = None |
| self.readlines = None |
| self.fileno = None |
| if self.fp: self.fp.close() |
| self.fp = None |
| |
| class addclosehook(addbase): |
| """Class to add a close hook to an open file.""" |
| |
| def __init__(self, fp, closehook, *hookargs): |
| addbase.__init__(self, fp) |
| self.closehook = closehook |
| self.hookargs = hookargs |
| |
| def close(self): |
| addbase.close(self) |
| if self.closehook: |
| apply(self.closehook, self.hookargs) |
| self.closehook = None |
| self.hookargs = None |
| |
| class addinfo(addbase): |
| """class to add an info() method to an open file.""" |
| |
| def __init__(self, fp, headers): |
| addbase.__init__(self, fp) |
| self.headers = headers |
| |
| def info(self): |
| return self.headers |
| |
| class addinfourl(addbase): |
| """class to add info() and geturl() methods to an open file.""" |
| |
| def __init__(self, fp, headers, url): |
| addbase.__init__(self, fp) |
| self.headers = headers |
| self.url = url |
| |
| def info(self): |
| return self.headers |
| |
| def geturl(self): |
| return self.url |
| |
| |
| def basejoin(base, url): |
| """Utility to combine a URL with a base URL to form a new URL.""" |
| type, path = splittype(url) |
| if type: |
| # if url is complete (i.e., it contains a type), return it |
| return url |
| host, path = splithost(path) |
| type, basepath = splittype(base) # inherit type from base |
| if host: |
| # if url contains host, just inherit type |
| if type: return type + '://' + host + path |
| else: |
| # no type inherited, so url must have started with // |
| # just return it |
| return url |
| host, basepath = splithost(basepath) # inherit host |
| basepath, basetag = splittag(basepath) # remove extraneous cruft |
| basepath, basequery = splitquery(basepath) # idem |
| if path[:1] != '/': |
| # non-absolute path name |
| if path[:1] in ('#', '?'): |
| # path is just a tag or query, attach to basepath |
| i = len(basepath) |
| else: |
| # else replace last component |
| i = basepath.rfind('/') |
| if i < 0: |
| # basepath not absolute |
| if host: |
| # host present, make absolute |
| basepath = '/' |
| else: |
| # else keep non-absolute |
| basepath = '' |
| else: |
| # remove last file component |
| basepath = basepath[:i+1] |
| # Interpret ../ (important because of symlinks) |
| while basepath and path[:3] == '../': |
| path = path[3:] |
| i = basepath[:-1].rfind('/') |
| if i > 0: |
| basepath = basepath[:i+1] |
| elif i == 0: |
| basepath = '/' |
| break |
| else: |
| basepath = '' |
| |
| path = basepath + path |
| if host and path and path[0] != '/': |
| path = '/' + path |
| if type and host: return type + '://' + host + path |
| elif type: return type + ':' + path |
| elif host: return '//' + host + path # don't know what this means |
| else: return path |
| |
| |
| # Utilities to parse URLs (most of these return None for missing parts): |
| # unwrap('<URL:type://host/path>') --> 'type://host/path' |
| # splittype('type:opaquestring') --> 'type', 'opaquestring' |
| # splithost('//host[:port]/path') --> 'host[:port]', '/path' |
| # splituser('user[:passwd]@host[:port]') --> 'user[:passwd]', 'host[:port]' |
| # splitpasswd('user:passwd') -> 'user', 'passwd' |
| # splitport('host:port') --> 'host', 'port' |
| # splitquery('/path?query') --> '/path', 'query' |
| # splittag('/path#tag') --> '/path', 'tag' |
| # splitattr('/path;attr1=value1;attr2=value2;...') -> |
| # '/path', ['attr1=value1', 'attr2=value2', ...] |
| # splitvalue('attr=value') --> 'attr', 'value' |
| # splitgophertype('/Xselector') --> 'X', 'selector' |
| # unquote('abc%20def') -> 'abc def' |
| # quote('abc def') -> 'abc%20def') |
| |
| def toBytes(url): |
| """toBytes(u"URL") --> 'URL'.""" |
| # Most URL schemes require ASCII. If that changes, the conversion |
| # can be relaxed |
| if type(url) is types.UnicodeType: |
| try: |
| url = url.encode("ASCII") |
| except UnicodeError: |
| raise UnicodeError("URL " + repr(url) + |
| " contains non-ASCII characters") |
| return url |
| |
| def unwrap(url): |
| """unwrap('<URL:type://host/path>') --> 'type://host/path'.""" |
| url = url.strip() |
| if url[:1] == '<' and url[-1:] == '>': |
| url = url[1:-1].strip() |
| if url[:4] == 'URL:': url = url[4:].strip() |
| return url |
| |
| _typeprog = None |
| def splittype(url): |
| """splittype('type:opaquestring') --> 'type', 'opaquestring'.""" |
| global _typeprog |
| if _typeprog is None: |
| import re |
| _typeprog = re.compile('^([^/:]+):') |
| |
| match = _typeprog.match(url) |
| if match: |
| scheme = match.group(1) |
| return scheme.lower(), url[len(scheme) + 1:] |
| return None, url |
| |
| _hostprog = None |
| def splithost(url): |
| """splithost('//host[:port]/path') --> 'host[:port]', '/path'.""" |
| global _hostprog |
| if _hostprog is None: |
| import re |
| _hostprog = re.compile('^//([^/]*)(.*)$') |
| |
| match = _hostprog.match(url) |
| if match: return match.group(1, 2) |
| return None, url |
| |
| _userprog = None |
| def splituser(host): |
| """splituser('user[:passwd]@host[:port]') --> 'user[:passwd]', 'host[:port]'.""" |
| global _userprog |
| if _userprog is None: |
| import re |
| _userprog = re.compile('^([^@]*)@(.*)$') |
| |
| match = _userprog.match(host) |
| if match: return map(unquote, match.group(1, 2)) |
| return None, host |
| |
| _passwdprog = None |
| def splitpasswd(user): |
| """splitpasswd('user:passwd') -> 'user', 'passwd'.""" |
| global _passwdprog |
| if _passwdprog is None: |
| import re |
| _passwdprog = re.compile('^([^:]*):(.*)$') |
| |
| match = _passwdprog.match(user) |
| if match: return match.group(1, 2) |
| return user, None |
| |
| # splittag('/path#tag') --> '/path', 'tag' |
| _portprog = None |
| def splitport(host): |
| """splitport('host:port') --> 'host', 'port'.""" |
| global _portprog |
| if _portprog is None: |
| import re |
| _portprog = re.compile('^(.*):([0-9]+)$') |
| |
| match = _portprog.match(host) |
| if match: return match.group(1, 2) |
| return host, None |
| |
| _nportprog = None |
| def splitnport(host, defport=-1): |
| """Split host and port, returning numeric port. |
| Return given default port if no ':' found; defaults to -1. |
| Return numerical port if a valid number are found after ':'. |
| Return None if ':' but not a valid number.""" |
| global _nportprog |
| if _nportprog is None: |
| import re |
| _nportprog = re.compile('^(.*):(.*)$') |
| |
| match = _nportprog.match(host) |
| if match: |
| host, port = match.group(1, 2) |
| try: |
| if not port: raise ValueError, "no digits" |
| nport = int(port) |
| except ValueError: |
| nport = None |
| return host, nport |
| return host, defport |
| |
| _queryprog = None |
| def splitquery(url): |
| """splitquery('/path?query') --> '/path', 'query'.""" |
| global _queryprog |
| if _queryprog is None: |
| import re |
| _queryprog = re.compile('^(.*)\?([^?]*)$') |
| |
| match = _queryprog.match(url) |
| if match: return match.group(1, 2) |
| return url, None |
| |
| _tagprog = None |
| def splittag(url): |
| """splittag('/path#tag') --> '/path', 'tag'.""" |
| global _tagprog |
| if _tagprog is None: |
| import re |
| _tagprog = re.compile('^(.*)#([^#]*)$') |
| |
| match = _tagprog.match(url) |
| if match: return match.group(1, 2) |
| return url, None |
| |
| def splitattr(url): |
| """splitattr('/path;attr1=value1;attr2=value2;...') -> |
| '/path', ['attr1=value1', 'attr2=value2', ...].""" |
| words = url.split(';') |
| return words[0], words[1:] |
| |
| _valueprog = None |
| def splitvalue(attr): |
| """splitvalue('attr=value') --> 'attr', 'value'.""" |
| global _valueprog |
| if _valueprog is None: |
| import re |
| _valueprog = re.compile('^([^=]*)=(.*)$') |
| |
| match = _valueprog.match(attr) |
| if match: return match.group(1, 2) |
| return attr, None |
| |
| def splitgophertype(selector): |
| """splitgophertype('/Xselector') --> 'X', 'selector'.""" |
| if selector[:1] == '/' and selector[1:2]: |
| return selector[1], selector[2:] |
| return None, selector |
| |
| def unquote(s): |
| """unquote('abc%20def') -> 'abc def'.""" |
| mychr = chr |
| myatoi = int |
| list = s.split('%') |
| res = [list[0]] |
| myappend = res.append |
| del list[0] |
| for item in list: |
| if item[1:2]: |
| try: |
| myappend(mychr(myatoi(item[:2], 16)) |
| + item[2:]) |
| except ValueError: |
| myappend('%' + item) |
| else: |
| myappend('%' + item) |
| return "".join(res) |
| |
| def unquote_plus(s): |
| """unquote('%7e/abc+def') -> '~/abc def'""" |
| if '+' in s: |
| # replace '+' with ' ' |
| s = ' '.join(s.split('+')) |
| return unquote(s) |
| |
| always_safe = ('ABCDEFGHIJKLMNOPQRSTUVWXYZ' |
| 'abcdefghijklmnopqrstuvwxyz' |
| '0123456789' '_.-') |
| |
| _fast_safe_test = always_safe + '/' |
| _fast_safe = None |
| |
| def _fast_quote(s): |
| global _fast_safe |
| if _fast_safe is None: |
| _fast_safe = {} |
| for c in _fast_safe_test: |
| _fast_safe[c] = c |
| res = list(s) |
| for i in range(len(res)): |
| c = res[i] |
| if not _fast_safe.has_key(c): |
| res[i] = '%%%02X' % ord(c) |
| return ''.join(res) |
| |
| def quote(s, safe = '/'): |
| """quote('abc def') -> 'abc%20def' |
| |
| Each part of a URL, e.g. the path info, the query, etc., has a |
| different set of reserved characters that must be quoted. |
| |
| RFC 2396 Uniform Resource Identifiers (URI): Generic Syntax lists |
| the following reserved characters. |
| |
| reserved = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" | |
| "$" | "," |
| |
| Each of these characters is reserved in some component of a URL, |
| but not necessarily in all of them. |
| |
| By default, the quote function is intended for quoting the path |
| section of a URL. Thus, it will not encode '/'. This character |
| is reserved, but in typical usage the quote function is being |
| called on a path where the existing slash characters are used as |
| reserved characters. |
| """ |
| safe = always_safe + safe |
| if _fast_safe_test == safe: |
| return _fast_quote(s) |
| res = list(s) |
| for i in range(len(res)): |
| c = res[i] |
| if c not in safe: |
| res[i] = '%%%02X' % ord(c) |
| return ''.join(res) |
| |
| def quote_plus(s, safe = ''): |
| """Quote the query fragment of a URL; replacing ' ' with '+'""" |
| if ' ' in s: |
| l = s.split(' ') |
| for i in range(len(l)): |
| l[i] = quote(l[i], safe) |
| return '+'.join(l) |
| else: |
| return quote(s, safe) |
| |
| def urlencode(query,doseq=0): |
| """Encode a sequence of two-element tuples or dictionary into a URL query string. |
| |
| If any values in the query arg are sequences and doseq is true, each |
| sequence element is converted to a separate parameter. |
| |
| If the query arg is a sequence of two-element tuples, the order of the |
| parameters in the output will match the order of parameters in the |
| input. |
| """ |
| |
| if hasattr(query,"items"): |
| # mapping objects |
| query = query.items() |
| else: |
| # it's a bother at times that strings and string-like objects are |
| # sequences... |
| try: |
| # non-sequence items should not work with len() |
| # non-empty strings will fail this |
| if len(query) and type(query[0]) != types.TupleType: |
| raise TypeError |
| # zero-length sequences of all types will get here and succeed, |
| # but that's a minor nit - since the original implementation |
| # allowed empty dicts that type of behavior probably should be |
| # preserved for consistency |
| except TypeError: |
| ty,va,tb = sys.exc_info() |
| raise TypeError, "not a valid non-string sequence or mapping object", tb |
| |
| l = [] |
| if not doseq: |
| # preserve old behavior |
| for k, v in query: |
| k = quote_plus(str(k)) |
| v = quote_plus(str(v)) |
| l.append(k + '=' + v) |
| else: |
| for k, v in query: |
| k = quote_plus(str(k)) |
| if type(v) == types.StringType: |
| v = quote_plus(v) |
| l.append(k + '=' + v) |
| elif type(v) == types.UnicodeType: |
| # is there a reasonable way to convert to ASCII? |
| # encode generates a string, but "replace" or "ignore" |
| # lose information and "strict" can raise UnicodeError |
| v = quote_plus(v.encode("ASCII","replace")) |
| l.append(k + '=' + v) |
| else: |
| try: |
| # is this a sufficient test for sequence-ness? |
| x = len(v) |
| except TypeError: |
| # not a sequence |
| v = quote_plus(str(v)) |
| l.append(k + '=' + v) |
| else: |
| # loop over the sequence |
| for elt in v: |
| l.append(k + '=' + quote_plus(str(elt))) |
| return '&'.join(l) |
| |
| # Proxy handling |
| def getproxies_environment(): |
| """Return a dictionary of scheme -> proxy server URL mappings. |
| |
| Scan the environment for variables named <scheme>_proxy; |
| this seems to be the standard convention. If you need a |
| different way, you can pass a proxies dictionary to the |
| [Fancy]URLopener constructor. |
| |
| """ |
| proxies = {} |
| for name, value in os.environ.items(): |
| name = name.lower() |
| if value and name[-6:] == '_proxy': |
| proxies[name[:-6]] = value |
| return proxies |
| |
| if os.name == 'mac': |
| def getproxies(): |
| """Return a dictionary of scheme -> proxy server URL mappings. |
| |
| By convention the mac uses Internet Config to store |
| proxies. An HTTP proxy, for instance, is stored under |
| the HttpProxy key. |
| |
| """ |
| try: |
| import ic |
| except ImportError: |
| return {} |
| |
| try: |
| config = ic.IC() |
| except ic.error: |
| return {} |
| proxies = {} |
| # HTTP: |
| if config.has_key('UseHTTPProxy') and config['UseHTTPProxy']: |
| try: |
| value = config['HTTPProxyHost'] |
| except ic.error: |
| pass |
| else: |
| proxies['http'] = 'http://%s' % value |
| # FTP: XXXX To be done. |
| # Gopher: XXXX To be done. |
| return proxies |
| |
| def proxy_bypass(x): |
| return 0 |
| |
| elif os.name == 'nt': |
| def getproxies_registry(): |
| """Return a dictionary of scheme -> proxy server URL mappings. |
| |
| Win32 uses the registry to store proxies. |
| |
| """ |
| proxies = {} |
| try: |
| import _winreg |
| except ImportError: |
| # Std module, so should be around - but you never know! |
| return proxies |
| try: |
| internetSettings = _winreg.OpenKey(_winreg.HKEY_CURRENT_USER, |
| r'Software\Microsoft\Windows\CurrentVersion\Internet Settings') |
| proxyEnable = _winreg.QueryValueEx(internetSettings, |
| 'ProxyEnable')[0] |
| if proxyEnable: |
| # Returned as Unicode but problems if not converted to ASCII |
| proxyServer = str(_winreg.QueryValueEx(internetSettings, |
| 'ProxyServer')[0]) |
| if '=' in proxyServer: |
| # Per-protocol settings |
| for p in proxyServer.split(';'): |
| protocol, address = p.split('=', 1) |
| # See if address has a type:// prefix |
| import re |
| if not re.match('^([^/:]+)://', address): |
| address = '%s://%s' % (protocol, address) |
| proxies[protocol] = address |
| else: |
| # Use one setting for all protocols |
| if proxyServer[:5] == 'http:': |
| proxies['http'] = proxyServer |
| else: |
| proxies['http'] = 'http://%s' % proxyServer |
| proxies['ftp'] = 'ftp://%s' % proxyServer |
| internetSettings.Close() |
| except (WindowsError, ValueError, TypeError): |
| # Either registry key not found etc, or the value in an |
| # unexpected format. |
| # proxies already set up to be empty so nothing to do |
| pass |
| return proxies |
| |
| def getproxies(): |
| """Return a dictionary of scheme -> proxy server URL mappings. |
| |
| Returns settings gathered from the environment, if specified, |
| or the registry. |
| |
| """ |
| return getproxies_environment() or getproxies_registry() |
| |
| def proxy_bypass(host): |
| try: |
| import _winreg |
| import re |
| except ImportError: |
| # Std modules, so should be around - but you never know! |
| return 0 |
| try: |
| internetSettings = _winreg.OpenKey(_winreg.HKEY_CURRENT_USER, |
| r'Software\Microsoft\Windows\CurrentVersion\Internet Settings') |
| proxyEnable = _winreg.QueryValueEx(internetSettings, |
| 'ProxyEnable')[0] |
| proxyOverride = str(_winreg.QueryValueEx(internetSettings, |
| 'ProxyOverride')[0]) |
| # ^^^^ Returned as Unicode but problems if not converted to ASCII |
| except WindowsError: |
| return 0 |
| if not proxyEnable or not proxyOverride: |
| return 0 |
| # try to make a host list from name and IP address. |
| host = [host] |
| try: |
| addr = socket.gethostbyname(host[0]) |
| if addr != host: |
| host.append(addr) |
| except socket.error: |
| pass |
| # make a check value list from the registry entry: replace the |
| # '<local>' string by the localhost entry and the corresponding |
| # canonical entry. |
| proxyOverride = proxyOverride.split(';') |
| i = 0 |
| while i < len(proxyOverride): |
| if proxyOverride[i] == '<local>': |
| proxyOverride[i:i+1] = ['localhost', |
| '127.0.0.1', |
| socket.gethostname(), |
| socket.gethostbyname( |
| socket.gethostname())] |
| i += 1 |
| # print proxyOverride |
| # now check if we match one of the registry values. |
| for test in proxyOverride: |
| test = test.replace(".", r"\.") # mask dots |
| test = test.replace("*", r".*") # change glob sequence |
| test = test.replace("?", r".") # change glob char |
| for val in host: |
| # print "%s <--> %s" %( test, val ) |
| if re.match(test, val, re.I): |
| return 1 |
| return 0 |
| |
| else: |
| # By default use environment variables |
| getproxies = getproxies_environment |
| |
| def proxy_bypass(host): |
| return 0 |
| |
| # Test and time quote() and unquote() |
| def test1(): |
| s = '' |
| for i in range(256): s = s + chr(i) |
| s = s*4 |
| t0 = time.time() |
| qs = quote(s) |
| uqs = unquote(qs) |
| t1 = time.time() |
| if uqs != s: |
| print 'Wrong!' |
| print `s` |
| print `qs` |
| print `uqs` |
| print round(t1 - t0, 3), 'sec' |
| |
| |
| def reporthook(blocknum, blocksize, totalsize): |
| # Report during remote transfers |
| print "Block number: %d, Block size: %d, Total size: %d" % ( |
| blocknum, blocksize, totalsize) |
| |
| # Test program |
| def test(args=[]): |
| if not args: |
| args = [ |
| '/etc/passwd', |
| 'file:/etc/passwd', |
| 'file://localhost/etc/passwd', |
| 'ftp://ftp.python.org/pub/python/README', |
| ## 'gopher://gopher.micro.umn.edu/1/', |
| 'http://www.python.org/index.html', |
| ] |
| if hasattr(URLopener, "open_https"): |
| args.append('https://synergy.as.cmu.edu/~geek/') |
| try: |
| for url in args: |
| print '-'*10, url, '-'*10 |
| fn, h = urlretrieve(url, None, reporthook) |
| print fn |
| if h: |
| print '======' |
| for k in h.keys(): print k + ':', h[k] |
| print '======' |
| fp = open(fn, 'rb') |
| data = fp.read() |
| del fp |
| if '\r' in data: |
| table = string.maketrans("", "") |
| data = data.translate(table, "\r") |
| print data |
| fn, h = None, None |
| print '-'*40 |
| finally: |
| urlcleanup() |
| |
| def main(): |
| import getopt, sys |
| try: |
| opts, args = getopt.getopt(sys.argv[1:], "th") |
| except getopt.error, msg: |
| print msg |
| print "Use -h for help" |
| return |
| t = 0 |
| for o, a in opts: |
| if o == '-t': |
| t = t + 1 |
| if o == '-h': |
| print "Usage: python urllib.py [-t] [url ...]" |
| print "-t runs self-test;", |
| print "otherwise, contents of urls are printed" |
| return |
| if t: |
| if t > 1: |
| test1() |
| test(args) |
| else: |
| if not args: |
| print "Use -h for help" |
| for url in args: |
| print urlopen(url).read(), |
| |
| # Run test program when run as a script |
| if __name__ == '__main__': |
| main() |