#!/usr/bin/env python

"""
Run the queries described in README

cmd1:env keystore=`pwd` ./query.py 
cmd2: env ABAC_CN=1 keystore=`pwd` ./query.py

"""

import os
import ABAC

ctxt = ABAC.Context()

# Keystore is the directory containing the principal credentials.
# Load existing principals and/or policy credentials
if (os.environ.has_key("keystore")) :
    keystore=os.environ["keystore"]
    ctxt.load_directory(keystore)
else:
    print("keystore is not set...")
    exit(1)

# retrieve principals' keyid value from local credential files
alphaID=ABAC.ID("Alpha_ID.pem")
alphaID.id_load_privkey_file("Alpha_private.pem");
alpha=alphaID.id_keyid()

bobID=ABAC.ID("Bob_ID.pem")
bobID.id_load_privkey_file("Bob_private.pem");
bob=bobID.id_keyid()

maryannID=ABAC.ID("Maryann_ID.pem")
maryannID.id_load_privkey_file("Maryann_private.pem")
maryann=maryannID.id_keyid()

joeID=ABAC.ID("Joe_ID.pem")
joeID.id_load_privkey_file("Joe_private.pem")
joe=joeID.id_keyid()

##########################################################################
# dump the loaded principals/policies
#
out = ctxt.context_principals()
print "\n...final principal set..."
for x in out[1]:
    print "%s " % x.string()
out = ctxt.context_credentials()
print "\n...final policy attribute set..."
for c in out[1]:
    print "%s <- %s" % (c.head_string(), c.tail_string())

##########################################################################
# can Bob read fileA ?
# role=[keyid:Alpha].role:read([urn:'file://fileA']) 
# p=[keyid:Bob]
param=ABAC.DataTerm("urn", "'file://fileA'")
role = ABAC.Role(alpha,"read")
role.role_add_data_term(param)
p=ABAC.Role(bob)
print "\n===good============ alpha.read(fileA) <- Bob"
out = ctxt.query(role, p)
for c in out[1]:
    print "%s <- %s" % (c.head_string(), c.tail_string())

##########################################################################
# can Maryann read fileA ?
# role=[keyid:Alpha].role:read([urn:'file://fileA']) 
# p=[keyid:Maryann]
param=ABAC.DataTerm("urn", "'file://fileA'")
role = ABAC.Role(alpha,"read")
p=ABAC.Role(maryann)
print "\n===bad============ alpha.read(fileA) <- Maryann"
out = ctxt.query(role, p)
for c in out[1]:
    print "%s <- %s" % (c.head_string(), c.tail_string())