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