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package utils
import "strings"
// ExtractRoleNameFromPrincipal extracts role name from principal ARN
// Handles both STS assumed role and IAM role formats
func ExtractRoleNameFromPrincipal(principal string) string {
// Handle STS assumed role format: arn:aws:sts::assumed-role/RoleName/SessionName
stsPrefix := "arn:aws:sts::assumed-role/"
if strings.HasPrefix(principal, stsPrefix) {
remainder := principal[len(stsPrefix):]
// Split on first '/' to get role name
if slashIndex := strings.Index(remainder, "/"); slashIndex != -1 {
return remainder[:slashIndex]
}
// If no slash found, return the remainder (edge case)
return remainder
}
// Handle IAM role format: arn:aws:iam::role/RoleName
iamPrefix := "arn:aws:iam::role/"
if strings.HasPrefix(principal, iamPrefix) {
return principal[len(iamPrefix):]
}
// Return empty string to signal invalid ARN format
// This allows callers to handle the error explicitly instead of masking it
return ""
}
// ExtractRoleNameFromArn extracts role name from an IAM role ARN
// Specifically handles: arn:aws:iam::role/RoleName
func ExtractRoleNameFromArn(roleArn string) string {
prefix := "arn:aws:iam::role/"
if strings.HasPrefix(roleArn, prefix) && len(roleArn) > len(prefix) {
return roleArn[len(prefix):]
}
return ""
}
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