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instance_credentials.go
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/
instance_credentials.go
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package provider
import (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"os"
"time"
"github.com/aliyun/alibaba-cloud-sdk-go/sdk/auth"
"github.com/aliyun/alibaba-cloud-sdk-go/sdk/auth/credentials"
)
var securityCredURL = "http://100.100.100.200/latest/meta-data/ram/security-credentials/"
type InstanceCredentialsProvider struct{}
var ProviderInstance = new(InstanceCredentialsProvider)
var HookGet = func(fn func(string) (int, []byte, error)) func(string) (int, []byte, error) {
return fn
}
func NewInstanceCredentialsProvider() Provider {
return &InstanceCredentialsProvider{}
}
func (p *InstanceCredentialsProvider) Resolve() (auth.Credential, error) {
roleName, ok := os.LookupEnv(ENVEcsMetadata)
if !ok {
return nil, nil
}
if roleName == "" {
return nil, errors.New("Environmental variable 'ALIBABA_CLOUD_ECS_METADATA' are empty")
}
status, content, err := HookGet(get)(securityCredURL + roleName)
if err != nil {
return nil, err
}
if status != 200 {
if status == 404 {
return nil, fmt.Errorf("The role was not found in the instance")
}
return nil, fmt.Errorf("Received %d when getting security credentials for %s", status, roleName)
}
body := make(map[string]interface{})
if err := json.Unmarshal(content, &body); err != nil {
return nil, err
}
accessKeyID, err := extractString(body, "AccessKeyId")
if err != nil {
return nil, err
}
accessKeySecret, err := extractString(body, "AccessKeySecret")
if err != nil {
return nil, err
}
securityToken, err := extractString(body, "SecurityToken")
if err != nil {
return nil, err
}
return credentials.NewStsTokenCredential(accessKeyID, accessKeySecret, securityToken), nil
}
func get(url string) (status int, content []byte, err error) {
httpClient := http.DefaultClient
httpClient.Timeout = 1 * time.Second
resp, err := httpClient.Get(url)
if err != nil {
return
}
defer resp.Body.Close()
content, err = ioutil.ReadAll(resp.Body)
return resp.StatusCode, content, err
}
func extractString(m map[string]interface{}, key string) (string, error) {
raw, ok := m[key]
if !ok {
return "", fmt.Errorf("%s not in map", key)
}
str, ok := raw.(string)
if !ok {
return "", fmt.Errorf("%s is not a string in map", key)
}
return str, nil
}