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import json
class IAM(object):
def __init__(self, iam_client):
self.iam_client = iam_client
def check_if_role_exists(self, role_name):
"""Method to verify if a particular role exists"""
try:
self.iam_client.get_role(RoleName=role_name)
except self.iam_client.exceptions.NoSuchEntityException:
return False
return True
def check_if_policy_exists(self, policy_arn):
"""Method to verify if a particular policy exists"""
try:
self.iam_client.get_policy(PolicyArn=policy_arn)
except self.iam_client.exceptions.NoSuchEntityException:
return False
return True
def attach_policy_to_role(self, policy_arn, role_name):
"""Method to attach LifecyclePolicy to role specified by role_name"""
return self.iam_client.attach_role_policy(
PolicyArn=policy_arn,
RoleName=role_name
)
def create_role_with_trust_policy(self, role_name, assume_role_policy):
"""Method to create role with a given role name
and assume_role_policy
"""
return self.iam_client.create_role(
RoleName=role_name,
AssumeRolePolicyDocument=json.dumps(assume_role_policy))
def get_policy(self, arn):
"""Method to get the Policy for a particular ARN
This is used to display the policy contents to the user
"""
pol_det = self.iam_client.get_policy(PolicyArn=arn)
policy_version_details = self.iam_client.get_policy_version(
PolicyArn=arn,
VersionId=pol_det.get("Policy", {}).get("DefaultVersionId", "")
)
return policy_version_details\
.get("PolicyVersion", {})\
.get("Document", {})
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