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iri.py
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198 lines (172 loc) · 4.84 KB
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##
# .iri
##
"""
Parse and serialize PQ IRIs.
PQ IRIs take the form::
pq://user:pass@host:port/database?setting=value&setting2=value2
IPv6 is supported via the standard representation::
pq://[::1]:5432/database
Driver Parameters:
pq://user@host/?[driver_param]=value&[other_param]=value?server_setting=val
"""
from .resolved import riparse as ri
from .string import split_ident
from operator import itemgetter
get0 = itemgetter(0)
del itemgetter
import re
escape_path_re = re.compile('[%s]' %(re.escape(ri.unescaped + ','),))
def structure(d, fieldproc = ri.unescape):
"""
Create a clientparams dictionary from a parsed RI.
"""
if d.get('scheme', 'pq').lower() not in {'pq', 'postgres', 'postgresql'}:
raise ValueError("PQ-IRI scheme is not 'pq', 'postgres', or 'postgresql'")
cpd = {
k : fieldproc(v) for k, v in d.items()
if k not in ('path', 'fragment', 'query', 'host', 'scheme')
}
path = d.get('path')
frag = d.get('fragment')
query = d.get('query')
host = d.get('host')
if host is not None:
if host.startswith('[') and host.endswith(']'):
host = host[1:-1]
if host.startswith('unix:'):
cpd['unix'] = host[len('unix:'):].replace(':','/')
else:
cpd['host'] = host
else:
cpd['host'] = fieldproc(host)
if path:
# Only state the database field's existence if the first path is non-empty.
if path[0]:
cpd['database'] = path[0]
path = path[1:]
if path:
cpd['path'] = path
settings = {}
if query:
if hasattr(query, 'items'):
qiter = query.items()
else:
qiter = query
for k, v in qiter:
if k.startswith('[') and k.endswith(']'):
k = k[1:-1]
if k != 'settings' and k not in cpd:
cpd[fieldproc(k)] = fieldproc(v)
elif k:
settings[fieldproc(k)] = fieldproc(v)
# else: ignore empty query keys
if frag:
settings['search_path'] = [
fieldproc(x) for x in frag.split(',')
]
if settings:
cpd['settings'] = settings
return cpd
def construct_path(x, re = escape_path_re):
"""
Join a path sequence using ',' and escaping ',' in the pieces.
"""
return ','.join((re.sub(ri.re_pct_encode, y) for y in x))
def construct(x, obscure_password = False):
"""
Construct a RI dictionary from a clientparams dictionary.
"""
# the rather exhaustive settings choreography is due to
# a desire to allow the search_path to be appended in the fragment
settings = x.get('settings')
no_path_settings = None
search_path = None
if settings:
if isinstance(settings, dict):
siter = settings.items()
search_path = settings.get('search_path')
else:
siter = list(settings)
search_path = [(k,v) for k,v in siter if k == 'search_path']
search_path.append((None,None))
search_path = search_path[-1][1]
no_path_settings = [(k,v) for k,v in siter if k != 'search_path']
if not no_path_settings:
no_path_settings = None
# It could be a string search_path, split if it is.
if search_path is not None and isinstance(search_path, str):
search_path = split_ident(search_path, sep = ',')
port = None
if 'unix' in x:
host = '[unix:' + x['unix'].replace('/',':') + ']'
# ignore port.. it's a mis-config.
elif 'host' in x:
host = x['host']
if ':' in host:
host = '[' + host + ']'
port = x.get('port')
else:
host = None
port = x.get('port')
path = []
if 'database' in x:
path.append(x['database'])
if 'path' in x:
path.extend(x['path'] or ())
password = x.get('password')
if obscure_password and password is not None:
password = '***'
driver_params = list({
'[' + k + ']' : str(v) for k,v in x.items()
if k not in (
'user', 'password', 'port', 'database', 'ssl',
'path', 'host', 'unix', 'ipv','settings'
)
}.items())
driver_params.sort(key=get0)
return (
'pqs' if x.get('ssl', False) is True else 'pq',
# netloc: user:pass@host[:port]
ri.unsplit_netloc((
x.get('user'),
password,
host,
None if 'port' not in x else str(x['port'])
)),
None if not path else '/'.join([
ri.escape_path_re.sub(path_comp, '/')
for path_comp in path
]),
(ri.construct_query(driver_params) if driver_params else None)
if no_path_settings is None else (
ri.construct_query(
driver_params + no_path_settings
)
),
None if search_path is None else construct_path(search_path),
)
def parse(s, fieldproc = ri.unescape):
"""
Parse a Postgres IRI into a dictionary object.
"""
return structure(
# In ri.parse, don't unescape the parsed values as our sub-structure
# uses the escape mechanism in IRIs to specify literal separator
# characters.
ri.parse(s, fieldproc = str),
fieldproc = fieldproc
)
def serialize(x, obscure_password = False):
"""
Return a Postgres IRI from a dictionary object.
"""
return ri.unsplit(construct(x, obscure_password = obscure_password))
if __name__ == '__main__':
import sys
for x in sys.argv[1:]:
print("{src} -> {parsed!r} -> {serial}".format(
src = x,
parsed = parse(x),
serial = serialize(parse(x))
))