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package arn
import (
"fmt"
"strings"
"github.com/aws/aws-sdk-go/aws/arn"
)
// Resource provides the interfaces abstracting ARNs of specific resource
// types.
type Resource interface {
GetARN() arn.ARN
String() string
}
// ResourceParser provides the function for parsing an ARN's resource
// component into a typed resource.
type ResourceParser func(arn.ARN) (Resource, error)
// ParseResource parses an AWS ARN into a typed resource for the S3 API.
func ParseResource(s string, resParser ResourceParser) (resARN Resource, err error) {
a, err := arn.Parse(s)
if err != nil {
return nil, err
}
if len(a.Partition) == 0 {
return nil, InvalidARNError{ARN: a, Reason: "partition not set"}
}
if a.Service != "s3" && a.Service != "s3-outposts" {
return nil, InvalidARNError{ARN: a, Reason: "service is not supported"}
}
if len(a.Resource) == 0 {
return nil, InvalidARNError{ARN: a, Reason: "resource not set"}
}
return resParser(a)
}
// SplitResource splits the resource components by the ARN resource delimiters.
func SplitResource(v string) []string {
var parts []string
var offset int
for offset <= len(v) {
idx := strings.IndexAny(v[offset:], "/:")
if idx < 0 {
parts = append(parts, v[offset:])
break
}
parts = append(parts, v[offset:idx+offset])
offset += idx + 1
}
return parts
}
// IsARN returns whether the given string is an ARN
func IsARN(s string) bool {
return arn.IsARN(s)
}
// InvalidARNError provides the error for an invalid ARN error.
type InvalidARNError struct {
ARN arn.ARN
Reason string
}
// Error returns a string denoting the occurred InvalidARNError
func (e InvalidARNError) Error() string {
return fmt.Sprintf("invalid Amazon %s ARN, %s, %s", e.ARN.Service, e.Reason, e.ARN.String())
}
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