def canonical_string(method, path, headers, expires=None,
provider=None):
"""
Generates the aws canonical string for the given parameters
"""
if not provider:
provider = boto.provider.get_default()
interesting_headers = {}
for key in headers:
lk = key.lower()
if headers[key] is not None and \
(lk in ['content-md5', 'content-type', 'date'] or
lk.startswith(provider.header_prefix)):
interesting_headers[lk] = str(headers[key]).strip()
# these keys get empty strings if they don't exist
if 'content-type' not in interesting_headers:
interesting_headers['content-type'] = ''
if 'content-md5' not in interesting_headers:
interesting_headers['content-md5'] = ''
# just in case someone used this. it's not necessary in this lib.
if provider.date_header in interesting_headers:
interesting_headers['date'] = ''
# if you're using expires for query string auth, then it trumps date
# (and provider.date_header)
if expires:
interesting_headers['date'] = str(expires)
sorted_header_keys = sorted(interesting_headers.keys())
buf = "%s\n" % method
for key in sorted_header_keys:
val = interesting_headers[key]
if key.startswith(provider.header_prefix):
buf += "%s:%s\n" % (key, val)
else:
buf += "%s\n" % val
# don't include anything after the first ? in the resource...
# unless it is one of the QSA of interest, defined above
t = path.split('?')
buf += t[0]
if len(t) > 1:
qsa = t[1].split('&')
qsa = [a.split('=', 1) for a in qsa]
qsa = [unquote_v(a) for a in qsa if a[0] in qsa_of_interest]
if len(qsa) > 0:
qsa.sort(key=lambda x: x[0])
qsa = ['='.join(a) for a in qsa]
buf += '?'
buf += '&'.join(qsa)
return buf
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