-
Notifications
You must be signed in to change notification settings - Fork 0
/
odrl-parser.py
159 lines (117 loc) · 5.1 KB
/
odrl-parser.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
# Copyright 2024 saud.khan
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import sys
import json
def parse_odrl_policy(odrl_json):
# Extract the policy object
policy = odrl_json.get('policy', {})
# Initialize a list to store human-readable text
human_readable = []
# Process permissions
permissions = policy.get('odrl:permission', [])
prohibitions = policy.get('odrl:prohibition', [])
obligations = policy.get('odrl:obligation', [])
# process permissions
for permission in permissions:
action = permission.get('odrl:action', 'an action')
# Begin forming the sentence
sentence = f"You are allowed to {parse_action(permission)} the resource."
# Check for constraints
constraint = permission.get('odrl:constraint', {})
or_constraints = constraint.get('odrl:or', [])
and_constraints = constraint.get('odrl:and', [])
condition_type = 'permission'
if or_constraints:
text = parse_contraints(or_constraints, sentence, condition_type,'or')
if and_constraints:
text = parse_contraints(and_constraints, sentence, condition_type, 'and')
human_readable.append(text)
# process prohibitions
for prohibition in prohibitions:
#action = prohibition.get('odrl:action', 'an action')
# Begin forming the sentence
sentence = f"You are prohibited to {parse_action(prohibition)} the resource."
# Check for constraints
constraint = prohibition.get('odrl:constraint', {})
or_constraints = constraint.get('odrl:or', [])
and_constraints = constraint.get('odrl:and', [])
condition_type = 'prohibition'
if or_constraints:
text = parse_contraints(or_constraints, sentence, condition_type,'or')
if and_constraints:
text = parse_contraints(and_constraints, sentence, condition_type, 'and')
human_readable.append(text)
# process obligations
for obligation in obligations:
action = obligation.get('odrl:action', 'an action')
# Begin forming the sentence
sentence = f"You are obligated to {parse_action(obligation)} the resource."
# Check for constraints
constraint = prohibition.get('odrl:constraint', {})
or_constraints = constraint.get('odrl:or', [])
and_constraints = constraint.get('odrl:and', [])
condition_type = 'obligation'
if or_constraints:
text = parse_contraints(or_constraints, sentence, condition_type, 'or')
if and_constraints:
text = parse_contraints(and_constraints, sentence, condition_type, 'and')
human_readable.append(text)
return " ".join(human_readable)
def parse_action(condition_type):
action = None
if condition_type.get('odrl:action', {}):
action = condition_type.get('odrl:action', {})
type = condition_type.get('odrl:type', 'use')
return type
return {action.lower()}
def parse_contraints(constraints, sentence, condition_type, logical_operator):
condition_sentences = []
for con in constraints:
left_operand = con.get('odrl:leftOperand', 'something')
if type(left_operand) != str:
left_operand = left_operand.get('@id', 'id')
operator = con.get('odrl:operator', {}).get('@id', 'unknown').split(":")[-1]
right_operand = con.get('odrl:rightOperand', 'a value')
# Create a human-readable condition
condition_sentence = f"the {left_operand} {operator} {right_operand}"
condition_sentences.append(condition_sentence)
if logical_operator == 'or':
# Join all conditions with 'or'
conditions_text = " or ".join(condition_sentences)
elif logical_operator == 'and':
# Join all conditions with 'and'
conditions_text = " and ".join(condition_sentences)
else:
# Join Single condition
conditions_text = "".join(condition_sentences)
if condition_type == 'permission':
sentence += f" This is allowed if {conditions_text}."
elif condition_type == 'prohibition':
sentence += f" This is prohibited if {conditions_text}."
else:
sentence += f" This is obligated if {conditions_text}."
return sentence
def readFromFile(file):
data = None
with open(file, 'r') as f:
data = f.read()
return data
file = sys.argv[1]
policy = readFromFile(file)
policy = json.loads(policy)
print('Your odrl policy:')
print(json.dumps(policy, indent=2))
print('Interpretation:')
policy_text = parse_odrl_policy(policy)
print(policy_text)