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Decode URLs from Sage single cell server into Sage code
Permalinks from the Sage cell server [1] include the Sage code in the URL,
and sometimes you may want to get that Sage code without loading the URL
in a browser.
The get_sage_code function does exactly that. It's basically copied from [2]. Just feed it the full URL and it returns the Sage
The get_urls function is the inverse. It is essentially stolen from line
158 in the same file. It returns a list of URLs: the first is the
base64-encoded one, and if your code is short enough, there will be a
second "quoted" URL.
--Dan Drake
from base64 import urlsafe_b64decode as decode
from zlib import decompress
from urlparse import urlparse
from urllib import unquote
def get_sage_code(url):
return decompress(
from base64 import urlsafe_b64encode as encode
from zlib import compress
from urllib import urlencode
def get_urls(s_, server=''):
If your input is not pure ASCII, you will need to give this function
a real Unicode string, or else encoding will give you a
UnicodeDecodeError (yes, really: [1]). Just using u"..." in the
Python/Sage interpreter does not always seem to work; my
recommendation is to put your code into a file (so your editor does
the work of proper encoding) and then use the codecs module.
>>> get_urls('filename', 'r', 'utf8').read())
Presumably this all goes away in Python 3, where all strings are
s = s_.encode('utf8')
code = encode(
ret = ['http://{0}/?{1}'.format(server, urlencode({'z': code}))]
quoted = urlencode({'c': s})
if len(quoted) < 100:
ret.append('http://{0}/?{1}'.format(server, quoted))
return ret
if __name__ == '__main__':
import sys
print get_sage_code(sys.argv[1])
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