从 ARN 中提取资源 ID

Question

我在 AWS 文档中看到 ARN 格式是：

arn:partition:service:region:account-id:resource-id

arn:partition:service:region:account-id:resource-type/resource-id

arn:partition:service:region:account-id:resource-type:resource-id

我正在尝试resource-id从 ARN 获取。

以下代码有效，但丑陋...

我正在寻找如何改进它：

func GetResourceNameFromARN(roleARN string) string {

    if parsedARN, err := arn.Parse(roleARN); err == nil {

        return parsedARN.Resource

    }

    return ""

}

func extractResourceId(arn string) string {

    resource := GetResourceNameFromARN(arn)

    switch len(strings.Split(resource, "/")) {

    case 1:

        switch len(strings.Split(resource, ":")) {

        case 2:

            return strings.Split(resource, ":")[1]

        }

    case 2:

        return strings.Split(resource, "/")[1]

    }

    return resource

}

Answer 1

我建议一个简单的正则表达式：package mainimport (    "fmt"    "regexp")func main() {    // Compile the expression once, usually at init time.    // Use raw strings to avoid having to quote the backslashes.    var validID = regexp.MustCompile(`[^:/]*$`)    fmt.Println(validID.FindString("arn:partition:service:region:account-id:resource-id"))    fmt.Println(validID.FindString("arn:partition:service:region:account-id:resource-type/resource-id"))    fmt.Println(validID.FindString("arn:partition:service:region:account-id:resource-type:resource-id"))}