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CreateRole.go
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CreateRole.go
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
// snippet-start:[cloudwatch.go.create_role]
package main
// snippet-start:[cloudwatch.go.create_role.imports]
import (
"flag"
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/iam"
)
// snippet-end:[cloudwatch.go.create_role.imports]
// CreateRole creates a role that grants permission to Amazon CloudWatch Events
// Inputs:
//
// sess is the current session, which provides configuration for the SDK's service clients
// role is the name of the role
//
// Output:
//
// If successful, a CreateRoleOutput and nil
// Otherwise, nil and the error from a call to CreateRole
func CreateRole(sess *session.Session, roleName *string, policyName *string) (*iam.CreateRoleOutput, error) {
// Create the service client
// snippet-start:[cloudwatch.go.create_role.client]
svc := iam.New(sess)
// snippet-end:[cloudwatch.go.create_role.client]
// From: https://docs.aws.amazon.com/sdk-for-go/v1/developer-guide/cw-example-sending-events.html
// snippet-start:[cloudwatch.go.create_role.role_policy]
rolePolicy := []byte(`{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "CloudWatchEventsFullAccess",
"Effect": "Allow",
"Action": "events:*",
"Resource": "*"
},
{
"Sid": "IAMPassRoleForCloudWatchEvents",
"Effect": "Allow",
"Action": "iam:PassRole",
"Resource": "arn:aws:iam::*:role/AWS_Events_Invoke_Targets"
}
]
}`)
policy := string(rolePolicy[:])
createPolicyResult, err := svc.CreatePolicy(&iam.CreatePolicyInput{
PolicyDocument: &policy,
PolicyName: policyName,
})
// snippet-end:[cloudwatch.go.create_role.role_policy]
if err != nil {
return nil, err
}
// snippet-start:[cloudwatch.go.create_role.role_trust]
trustRelationship := []byte(`{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Principal": {
"Service": "events.amazonaws.com"
},
"Action": "sts:AssumeRole"
}
]
}`)
trustPolicy := string(trustRelationship[:])
createRoleResult, err := svc.CreateRole(&iam.CreateRoleInput{
AssumeRolePolicyDocument: aws.String(trustPolicy),
RoleName: roleName,
})
// snippet-end:[cloudwatch.go.create_role.role_trust]
if err != nil {
return nil, err
}
getUserResult, err := svc.GetUser(nil)
if err != nil {
return nil, err
}
userName := getUserResult.User.UserName
// snippet-start:[cloudwatch.go.create_role.attach_user_policy]
_, err = svc.AttachUserPolicy(&iam.AttachUserPolicyInput{
PolicyArn: createPolicyResult.Policy.Arn,
UserName: userName,
})
// snippet-end:[cloudwatch.go.create_role.attach_user_policy]
if err != nil {
return nil, err
}
return createRoleResult, nil
}
func main() {
// snippet-start:[cloudwatch.go.create_role.args]
policyName := flag.String("p", "", "The name of the policy")
roleName := flag.String("r", "", "The name of the role")
flag.Parse()
if *policyName == "" || *roleName == "" {
fmt.Println("You must supply a policy name (-p POLICY) and role name (-r ROLE)")
return
}
// snippet-end:[cloudwatch.go.create_role.args]
// Initialize a session that the SDK uses to load
// credentials from the shared credentials file (~/.aws/credentials)
// snippet-start:[cloudwatch.go.create_role.session]
sess := session.Must(session.NewSessionWithOptions(session.Options{
SharedConfigState: session.SharedConfigEnable,
}))
// snippet-end:[cloudwatch.go.create_role.session]
result, err := CreateRole(sess, roleName, policyName)
if err != nil {
fmt.Println("Got an error creating the role:")
fmt.Println(err)
return
}
// snippet-start:[cloudwatch.go.create_role.print]
fmt.Println("Role ARN: " + *result.Role.Arn)
// snippet-end:[cloudwatch.go.create_role.print]
}
// snippet-end:[cloudwatch.go.create_role]