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Allow ExternalId to be supplied to STS AssumeRole API request #71

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Allow ExternalId to be supplied to STS AssumeRole API request #71

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17 changes: 15 additions & 2 deletions auth_assumerole.go
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Original file line number Diff line number Diff line change
Expand Up @@ -14,11 +14,19 @@ import (
// stsAuth object is used to authenticate to STS to fetch temporary credentials
// for the desired role.
func NewAuthWithAssumedRole(roleArn, sessionName, region string, stsAuth Auth) (Auth, error) {
return NewAuthWithAssumedRoleAndExternalID(roleArn, sessionName, region, "", stsAuth)
}

// NewAuthWithAssumedRoleAndExternalID works just like NewAuthWithAssumedRole, except
// that it includes the supplied externalID parameter as the 'ExternalId' parameter
// in the authentication request to STS.
func NewAuthWithAssumedRoleAndExternalID(roleArn, sessionName, region, externalID string, stsAuth Auth) (Auth, error) {
return newCachedMutexedWarmedUpAuth(&stsCreds{
RoleARN: roleArn,
SessionName: sessionName,
Region: region,
STSAuth: stsAuth,
ExternalID: externalID,
})
}

Expand All @@ -27,15 +35,20 @@ type stsCreds struct {
SessionName string
Region string
STSAuth Auth
ExternalID string
}

func (sts *stsCreds) ExpiringKeyForSigning(now time.Time) (*SigningKey, time.Time, error) {
r, err := http.NewRequest(http.MethodPost, fmt.Sprintf("https://sts.%s.amazonaws.com/?%s", sts.Region, (url.Values{
params := url.Values{
"Version": []string{"2011-06-15"},
"Action": []string{"AssumeRole"},
"RoleSessionName": []string{sts.SessionName},
"RoleArn": []string{sts.RoleARN},
}).Encode()), bytes.NewReader([]byte{}))
}
if sts.ExternalID != "" {
params["ExternalId"] = []string{sts.ExternalID}
}
r, err := http.NewRequest(http.MethodPost, fmt.Sprintf("https://sts.%s.amazonaws.com/?%s", sts.Region, params.Encode()), bytes.NewReader([]byte{}))
if err != nil {
return nil, time.Time{}, err
}
Expand Down