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test_resolver.py
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test_resolver.py
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from datetime import date
from typing import Dict
import pytest
from pycfmodel import parse
from pycfmodel.resolver import resolve
@pytest.mark.parametrize(
"function, expected_output", [({"Ref": "abc"}, "ABC"), ({"Ref": "potato"}, "UNDEFINED_PARAM_potato")]
)
def test_ref(function, expected_output):
parameters = {"abc": "ABC"}
mappings = {}
conditions = {}
assert resolve(function, parameters, mappings, conditions) == expected_output
@pytest.mark.parametrize(
"function, expected_output",
[({"Fn::ImportValue": "abc"}, "ABC"), ({"Fn::ImportValue": "potato"}, "UNDEFINED_PARAM_potato")],
)
def test_import_value(function, expected_output):
parameters = {"abc": "ABC"}
mappings = {}
conditions = {}
assert resolve(function, parameters, mappings, conditions) == expected_output
@pytest.mark.parametrize(
"function, expected_output",
[
({"Fn::Join": ["", []]}, ""),
({"Fn::Join": ["", ["aws"]]}, "aws"),
(
{"Fn::Join": ["", ["arn:", "aws", ":s3:::elasticbeanstalk-*-", "1234567890"]]},
"arn:aws:s3:::elasticbeanstalk-*-1234567890",
),
],
)
def test_join(function, expected_output):
parameters = {}
mappings = {}
conditions = {}
assert resolve(function, parameters, mappings, conditions) == expected_output
@pytest.mark.parametrize(
"function, expected_output",
[
({"Fn::FindInMap": ["RegionMap", "eu-west-1", "HVM64"]}, "UNDEFINED_MAPPING_RegionMap_eu-west-1_HVM64"),
({"Fn::FindInMap": ["RegionMap", "us-east-1", "HVM128"]}, "UNDEFINED_MAPPING_RegionMap_us-east-1_HVM128"),
({"Fn::FindInMap": ["RegionMap", "us-east-1", "HVM64"]}, "ami-0ff8a91507f77f867"),
],
)
def test_find_in_map(function, expected_output):
parameters = {}
mappings = {"RegionMap": {"us-east-1": {"HVM64": "ami-0ff8a91507f77f867"}}}
conditions = {}
assert resolve(function, parameters, mappings, conditions) == expected_output
@pytest.mark.parametrize(
"function, expected_output",
[
({"Fn::Sub": "www.skyscanner.net"}, "www.skyscanner.net"),
({"Fn::Sub": ["www.${Domain}", {"Domain": "skyscanner.net"}]}, "www.skyscanner.net"),
({"Fn::Sub": "---${abc}---"}, "---ABC---"),
({"Fn::Sub": ["--${abc}-${def}--", {"def": "DEF"}]}, "--ABC-DEF--"),
],
)
def test_sub(function, expected_output):
parameters = {"abc": "ABC"}
mappings = {}
conditions = {}
assert resolve(function, parameters, mappings, conditions) == expected_output
@pytest.mark.parametrize(
"function, expected_output",
[
({"Fn::Select": ["0", ["apples", "grapes", "oranges", "mangoes"]]}, "apples"),
({"Fn::Select": ["1", ["apples", "grapes", "oranges", "mangoes"]]}, "grapes"),
({"Fn::Select": ["2", ["apples", "grapes", "oranges", "mangoes"]]}, "oranges"),
],
)
def test_select(function, expected_output):
parameters = {}
mappings = {}
conditions = {}
assert resolve(function, parameters, mappings, conditions) == expected_output
@pytest.mark.parametrize(
"function, expected_output",
[
({"Fn::Split": ["|", "a|b"]}, ["a", "b"]),
({"Fn::Split": ["|", "a|b|c|"]}, ["a", "b", "c", ""]),
({"Fn::Split": ["|", "|"]}, ["", ""]),
],
)
def test_split(function, expected_output):
parameters = {}
mappings = {}
conditions = {}
assert resolve(function, parameters, mappings, conditions) == expected_output
@pytest.mark.parametrize(
"function, expected_output", [({"Fn::If": ["A", "a", "b"]}, "a"), ({"Fn::If": ["B", "a", "b"]}, "b")]
)
def test_if(function, expected_output):
parameters = {}
mappings = {}
conditions = {"A": True, "B": False}
assert resolve(function, parameters, mappings, conditions) == expected_output
@pytest.mark.parametrize(
"function, expected_output",
[
({"Fn::And": [True, True]}, True),
({"Fn::And": [False, True]}, False),
({"Fn::And": [True, False]}, False),
({"Fn::And": [False, False]}, False),
({"Fn::And": [True, True, True]}, True),
({"Fn::And": [False, True, False]}, False),
({"Fn::And": [False, False, False]}, False),
({"Fn::And": [True, True, True, True]}, True),
({"Fn::And": [False, True, False, True]}, False),
({"Fn::And": [False, False, False, False]}, False),
],
)
def test_and(function, expected_output):
parameters = {}
mappings = {}
conditions = {}
assert resolve(function, parameters, mappings, conditions) == expected_output
@pytest.mark.parametrize(
"function, expected_output",
[
({"Fn::Or": [True, True]}, True),
({"Fn::Or": [False, True]}, True),
({"Fn::Or": [True, False]}, True),
({"Fn::Or": [False, False]}, False),
({"Fn::Or": [True, True, True]}, True),
({"Fn::Or": [False, True, False]}, True),
({"Fn::Or": [False, False, False]}, False),
({"Fn::Or": [True, True, True, True]}, True),
({"Fn::Or": [False, True, False, True]}, True),
({"Fn::Or": [False, False, False, False]}, False),
],
)
def test_or(function, expected_output):
parameters = {}
mappings = {}
conditions = {}
assert resolve(function, parameters, mappings, conditions) == expected_output
@pytest.mark.parametrize("function, expected_output", [({"Fn::Not": [True]}, False), ({"Fn::Not": [False]}, True)])
def test_not(function, expected_output):
parameters = {}
mappings = {}
conditions = {}
assert resolve(function, parameters, mappings, conditions) == expected_output
@pytest.mark.parametrize(
"function, expected_output",
[
({"Fn::Equals": ["a", "a"]}, True),
({"Fn::Equals": ["a", "b"]}, False),
({"Fn::Equals": ["1123456789", 1123456789]}, True),
({"Fn::Equals": ["2019-12-10", date(2019, 12, 10)]}, True),
({"Fn::Equals": ["0.3", 0.3]}, True),
],
)
def test_equals(function, expected_output):
parameters = {}
mappings = {}
conditions = {}
assert resolve(function, parameters, mappings, conditions) == expected_output
@pytest.mark.parametrize("function, expected_output", [({"Fn::Base64": "holap :)"}, "aG9sYXAgOik=")])
def test_base64(function, expected_output):
parameters = {}
mappings = {}
conditions = {}
assert resolve(function, parameters, mappings, conditions) == expected_output
@pytest.mark.parametrize(
"function, expected_output", [({"Fn::GetAtt": ["logicalNameOfResource", "attributeName"]}, "GETATT")]
)
def test_get_attr(function, expected_output):
parameters = {}
mappings = {}
conditions = {}
assert resolve(function, parameters, mappings, conditions) == expected_output
@pytest.mark.parametrize("function, expected_output", [({"Fn::GetAZs": ""}, "GETAZS")])
def test_get_azs(function, expected_output):
parameters = {}
mappings = {}
conditions = {}
assert resolve(function, parameters, mappings, conditions) == expected_output
@pytest.mark.parametrize("function, expected_output", [({"Condition": "SomeOtherCondition"}, True)])
def test_condition(function, expected_output):
parameters = {}
mappings = {}
conditions = {"SomeOtherCondition": True}
assert resolve(function, parameters, mappings, conditions) == expected_output
def test_select_and_ref():
parameters = {"DbSubnetIpBlocks": ["10.0.48.0/24", "10.0.112.0/24", "10.0.176.0/24"]}
mappings = {}
conditions = {}
function = {"Fn::Select": ["0", {"Ref": "DbSubnetIpBlocks"}]}
assert resolve(function, parameters, mappings, conditions) == "10.0.48.0/24"
def test_join_and_ref():
parameters = {"Partition": "patata", "AWS::AccountId": "1234567890"}
mappings = {}
conditions = {}
function = {
"Fn::Join": ["", ["arn:", {"Ref": "Partition"}, ":s3:::elasticbeanstalk-*-", {"Ref": "AWS::AccountId"}]]
}
assert resolve(function, parameters, mappings, conditions) == "arn:patata:s3:::elasticbeanstalk-*-1234567890"
def test_sub_and_ref():
parameters = {"RootDomainName": "skyscanner.net"}
mappings = {}
conditions = {}
function = {"Fn::Sub": ["www.${Domain}", {"Domain": {"Ref": "RootDomainName"}}]}
assert resolve(function, parameters, mappings, conditions) == "www.skyscanner.net"
def test_select_and_split():
parameters = {"AccountSubnetIDs": "id1,id2,id3"}
mappings = {}
conditions = {}
function = {"Fn::Select": ["2", {"Fn::Split": [",", {"Ref": "AccountSubnetIDs"}]}]}
assert resolve(function, parameters, mappings, conditions) == "id3"
def test_find_in_map_and_ref():
parameters = {"AWS::Region": "us-east-1"}
mappings = {"RegionMap": {"us-east-1": {"HVM64": "ami-0ff8a91507f77f867"}}}
conditions = {}
function = {"Fn::FindInMap": ["RegionMap", {"Ref": "AWS::Region"}, "HVM64"]}
assert resolve(function, parameters, mappings, conditions) == "ami-0ff8a91507f77f867"
def test_template_conditions():
template = {
"Conditions": {
"Bool": True,
"BoolStr": "True",
"IsEqualNum": {"Fn::Equals": [123456, 123456]},
"IsEqualStr": {"Fn::Equals": ["a", "a"]}, # noqa: F601
"IsEqualStr": {"Fn::Equals": [True, True]}, # noqa: F601
"IsEqualRef": {"Fn::Equals": [{"Ref": "AWS::AccountId"}, "123"]},
"Not": {"Fn::Not": [False]},
},
"Resources": {},
}
model = parse(template).resolve(extra_params={"AWS::AccountId": "123"})
assert isinstance(model.Conditions, Dict)
assert all(isinstance(cv, bool) for cv in model.Conditions.values())
def test_resolve_scenario_1():
template = {
"AWSTemplateFormatVersion": "2010-09-09",
"Parameters": {"StarParameter": {"Type": "String", "Default": "*", "Description": "Star Param"}},
"Resources": {
"rootRole": {
"Type": "AWS::IAM::Role",
"Properties": {
"AssumeRolePolicyDocument": {
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {"AWS": {"Fn::Sub": "arn:aws:iam::${AWS::AccountId}:root"}},
"Action": ["sts:AssumeRole"],
}
],
},
"Path": "/",
"Policies": [
{
"PolicyName": "root",
"PolicyDocument": {
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": {"Ref": "StarParameter"},
"Resource": {"Ref": "StarParameter"},
}
],
},
}
],
},
}
},
}
model = parse(template).resolve(extra_params={"AWS::AccountId": "123"})
role = model.Resources["rootRole"]
policy = role.Properties.Policies[0]
statement = policy.PolicyDocument.Statement[0]
assert statement.Action == "*"
assert statement.Resource == "*"
assert role.Properties.AssumeRolePolicyDocument.Statement[0].Principal == {"AWS": "arn:aws:iam::123:root"}
def test_resolve_scenario_2():
template = {
"AWSTemplateFormatVersion": "2010-09-09",
"Description": "IAM role for Lambda",
"Parameters": {"LambdaFunctionName": {"Description": "Name of the lambda function", "Type": "String"}},
"Resources": {
"lambdaRole": {
"Properties": {
"AssumeRolePolicyDocument": {
"Statement": [
{
"Action": ["sts:AssumeRole"],
"Effect": "Allow",
"Principal": {"Service": ["lambda.amazonaws.com"]},
}
],
"Version": "2012-10-17",
},
"Path": "/",
"Policies": [
{
"PolicyDocument": {
"Statement": [
{
"Action": ["lambda:*"],
"Effect": "Allow",
"Resource": [
{
"Fn::Sub": (
"arn:aws:lambda:*:${AWS::AccountId}:function:${LambdaFunctionName}"
)
}
],
}
],
"Version": "2012-10-17",
},
"PolicyName": "lambda_permissions",
},
{
"PolicyDocument": {
"Statement": [
{
"Action": ["xray:PutTraceSegments", "xray:PutTelemetryRecords"],
"Effect": "Allow",
"Resource": ["*"],
}
],
"Version": "2012-10-17",
},
"PolicyName": "AWSXrayWriteOnlyAccess",
},
{
"PolicyDocument": {
"Statement": [
{
"Action": ["logs:CreateLogGroup", "logs:CreateLogStream", "logs:PutLogEvents"],
"Effect": "Allow",
"Resource": ["*"],
}
],
"Version": "2012-10-17",
},
"PolicyName": "Logging",
},
],
"RoleName": {"Fn::Sub": "${LambdaFunctionName}-role"},
},
"Type": "AWS::IAM::Role",
}
},
}
model = parse(template).resolve(extra_params={"AWS::AccountId": "123", "LambdaFunctionName": "test-lambda"})
assert (
model.Resources["lambdaRole"].Properties.Policies[0].PolicyDocument.Statement[0].Resource[0]
== "arn:aws:lambda:*:123:function:test-lambda"
)
assert model.Resources["lambdaRole"].Properties.RoleName == "test-lambda-role"
def test_resolve_scenario_3():
template = {
"AWSTemplateFormatVersion": "2010-09-09",
"Description": "Test resolving IP address in security group",
"Parameters": {
"IPValueIngress": {"Description": "Some IP Ingress", "Type": "String"},
"IPValueEgress": {"Description": "Some IP Egress", "Type": "String"},
},
"Resources": {
"InstanceSecurityGroup": {
"Type": "AWS::EC2::SecurityGroup",
"Properties": {
"GroupDescription": "Allow http to client host",
"VpcId": "VPCID",
"SecurityGroupIngress": [
{"IpProtocol": "tcp", "FromPort": 80, "ToPort": 80, "CidrIp": {"Ref": "IPValueIngress"}}
],
"SecurityGroupEgress": [
{"IpProtocol": "tcp", "FromPort": 80, "ToPort": 80, "CidrIp": {"Ref": "IPValueEgress"}}
],
},
}
},
}
model = parse(template).resolve(extra_params={"IPValueIngress": "1.1.1.1/16", "IPValueEgress": "127.0.0.1"})
assert (
model.Resources["InstanceSecurityGroup"].Properties.SecurityGroupIngress[0].CidrIp.with_netmask
== "1.1.0.0/255.255.0.0"
)
assert not model.Resources["InstanceSecurityGroup"].Properties.SecurityGroupIngress[0].CidrIp.is_private
assert (
model.Resources["InstanceSecurityGroup"].Properties.SecurityGroupEgress[0].CidrIp.with_netmask
== "127.0.0.1/255.255.255.255"
)