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assumerole.go
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/
assumerole.go
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package creds
import (
"fmt"
"github.com/aws/aws-sdk-go/service/sts"
)
// AssumeRoleOptions defines the available parameters for assuming roles
type AssumeRoleOptions struct {
RoleName string
AccountID string
SessionName string
Policy string
Lifetime int64
UseMfa bool
MfaCode string
MfaPrompt MfaPrompt
}
// AssumeRole executes an AWS role assumption
func (c Creds) AssumeRole(options AssumeRoleOptions) (Creds, error) {
logger.InfoMsg("assuming role")
logger.DebugMsgf("assumerole parameters: %+v", options)
err := c.assumeRolePreflight(&options)
if err != nil {
return Creds{}, err
}
partition, err := c.partition()
if err != nil {
return Creds{}, err
}
arn := fmt.Sprintf(
"arn:%s:iam::%s:role/%s",
partition,
options.AccountID,
options.RoleName,
)
logger.InfoMsgf("generated target arn: %s", arn)
params := &sts.AssumeRoleInput{
RoleArn: &arn,
}
if options.Policy != "" {
params.Policy = &options.Policy
}
if options.Lifetime != 0 {
params.DurationSeconds = &options.Lifetime
}
if options.SessionName != "" {
params.RoleSessionName = &options.SessionName
}
tokenCode, serialNumber, err := c.handleMfa(
options.UseMfa,
options.MfaCode,
options.MfaPrompt,
)
if err != nil {
return Creds{}, err
}
if tokenCode != "" {
params.TokenCode = &tokenCode
params.SerialNumber = &serialNumber
}
client, err := c.Client()
if err != nil {
return Creds{}, err
}
logger.InfoMsg("running assumerole api call")
resp, err := client.AssumeRole(params)
if err != nil {
return Creds{}, err
}
newCreds, err := NewFromStsSdk(resp.Credentials)
newCreds.Region = c.Region
newCreds.UserAgentItems = c.UserAgentItems
return newCreds, err
}
func (c Creds) assumeRolePreflight(options *AssumeRoleOptions) error {
var err error
if options.RoleName == "" {
return fmt.Errorf("role name cannot be empty")
}
if options.AccountID == "" {
options.AccountID, err = c.AccountID()
if err != nil {
return err
}
}
if options.SessionName == "" {
options.SessionName, err = c.UserName()
if err != nil {
return err
}
}
options.Lifetime, err = validateLifetime(options.Lifetime, AssumeRoleLifetimeLimits)
return err
}