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How to use iam_client method in localstack

Best Python code snippet using localstack_python

index.py

Source:index.py

1"""2Custom resource function to create/delete a GreengrassGroupRole with specific permissions3"""4import json5import os6import logging7import time8import boto39from botocore.exceptions import ClientError10__copyright__ = (11    "Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved."12)13__license__ = "MIT-0"14logger = logging.getLogger()15logger.setLevel(logging.INFO)16def create_greengrass_group_role(role_name: str, policy: str):17    """Creates a Greengrass Group Role with Greengrass managed role plus the additional18    policy statements from JSON policy statements19    """20    iam_client = boto3.client("iam")21    assume_role_policy_document = json.dumps(22        {23            "Version": "2012-10-17",24            "Statement": [25                {26                    "Effect": "Allow",27                    "Principal": {"Service": "greengrass.amazonaws.com"},28                    "Action": "sts:AssumeRole",29                }30            ],31        }32    )33    # Create IAM role and attach policies (managed and provided)34    try:35        # Create role and allow Greengrass to assume36        response = iam_client.create_role(37            RoleName=role_name, AssumeRolePolicyDocument=assume_role_policy_document38        )39        role_arn = response["Role"]["Arn"]40    except ClientError as e:41        logger.warning(42            f"Error calling iam.create_role() for role {role_name}, error: {e}"43        )44        return False45    try:46        # Apply general resource policy (limited iot, greengrass, and other services)47        iam_client.attach_role_policy(48            RoleName=role_name,49            PolicyArn="arn:aws:iam::aws:policy/service-role/AWSGreengrassResourceAccessRolePolicy",50        )51    except ClientError as e:52        logger.warning(53            f"Error calling iam_client.attach_role_policy() for role {role_name}, error: {e}"54        )55        return False56    try:57        # Apply inline policy to role58        iam_client.put_role_policy(59            RoleName=role_name,60            PolicyName="AdditionalGreengrassGroupPermissions",61            PolicyDocument=json.dumps(policy),62        )63    except ClientError as e:64        logger.warning(65            f"Error calling iam_client.put_role_policy() for role {role_name}, error: {e}"66        )67        return False68    return role_arn69def delete_greengrass_group_role(role_name: str):70    """Delete the GreengrassGroupRole"""71    iam_client = boto3.client("iam")72    try:73        # Get and delete attached inline policies74        policies = iam_client.list_role_policies(RoleName=role_name)["PolicyNames"]75        for policy in policies:76            iam_client.delete_role_policy(RoleName=role_name, PolicyName=policy)77    except ClientError as e:78        logger.warning(79            f"Error deleting inline policies for role {role_name}, error: {e}"80        )81        return False82    try:83        # Get and delete attached managed policies84        policies = iam_client.list_attached_role_policies(RoleName=role_name)[85            "AttachedPolicies"86        ]87        for policy in policies:88            iam_client.detach_role_policy(89                RoleName=role_name, PolicyArn=policy["PolicyArn"]90            )91    except ClientError as e:92        logger.warning(93            f"Error deleting managed policies for role {role_name}, error: {e}"94        )95        return False96    try:97        # Delete the role98        iam_client.delete_role(RoleName=role_name)99    except ClientError as e:100        logger.warning(101            f"Error calling iam_client.delete_role() for role {role_name}, error: {e}"102        )103        return False104    return True105def main(event, context):106    import logging as log107    import cfnresponse108    # NOTE: All ResourceProperties passed will uppercase the first letter109    #       of the property and leave the rest of the case intact.110    physical_id = event["ResourceProperties"]["PhysicalId"]111    cfn_response = cfnresponse.SUCCESS112    try:113        logger.info("Input event: %s", event)114        # Check if this is a Create and we're failing Creates115        if event["RequestType"] == "Create" and event["ResourceProperties"].get(116            "FailCreate", False117        ):118            raise RuntimeError("Create failure requested, logging")119        elif event["RequestType"] == "Create":120            # Operations to perform during Create, then return response_data121            role_arn = create_greengrass_group_role(122                role_name=event["ResourceProperties"]["RoleName"],123                policy=event["ResourceProperties"]["RolePolicy"],124            )125            if role_arn:126                response_data = {"roleArn": role_arn}127                logger.info(f"Created and returning roleArn: {role_arn}")128            else:129                logger.error("should not get here")130                cfn_response = cfnresponse.FAILED131                response_data = {}132        elif event["RequestType"] == "Update":133            # Operations to perform during Update, then return NULL for response data134            response_data = {}135        else:136            # Delete request137            # Operations to perform during Delete, then return response_data138            if not delete_greengrass_group_role(139                role_name=event["ResourceProperties"]["RoleName"]140            ):141                cfn_response = cfnresponse.FAILED142            response_data = {}143        cfnresponse.send(event, context, cfn_response, response_data, physical_id)144    except Exception as e:145        log.exception(e)146        # cfnresponse error message is always "see CloudWatch"...

iam.py

Source:iam.py

1import json2class IAM(object):3    def __init__(self, iam_client):4        self.iam_client = iam_client5    def check_if_role_exists(self, role_name):6        """Method to verify if a particular role exists"""7        try:8            self.iam_client.get_role(RoleName=role_name)9        except self.iam_client.exceptions.NoSuchEntityException:10            return False11        return True12    def check_if_policy_exists(self, policy_arn):13        """Method to verify if a particular policy exists"""14        try:15            self.iam_client.get_policy(PolicyArn=policy_arn)16        except self.iam_client.exceptions.NoSuchEntityException:17            return False18        return True19    def attach_policy_to_role(self, policy_arn, role_name):20        """Method to attach LifecyclePolicy to role specified by role_name"""21        return self.iam_client.attach_role_policy(22            PolicyArn=policy_arn,23            RoleName=role_name24        )25    def create_role_with_trust_policy(self, role_name, assume_role_policy):26        """Method to create role with a given role name27            and assume_role_policy28        """29        return self.iam_client.create_role(30            RoleName=role_name,31            AssumeRolePolicyDocument=json.dumps(assume_role_policy))32    def get_policy(self, arn):33        """Method to get the Policy for a particular ARN34        This is used to display the policy contents to the user35        """36        pol_det = self.iam_client.get_policy(PolicyArn=arn)37        policy_version_details = self.iam_client.get_policy_version(38            PolicyArn=arn,39            VersionId=pol_det.get("Policy", {}).get("DefaultVersionId", "")40        )41        return policy_version_details\42            .get("PolicyVersion", {})\...

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