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aws_creds.go
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aws_creds.go
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package aws
import (
"fmt"
"os"
"strconv"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/go-ini/ini"
)
type credentialsProvider struct {
credentialsPath string
refreshDuration time.Duration
roleArn string
awsRefreshTime time.Time
nextReadTime time.Time
}
func newCreds(credentialsPath string, refreshDuration time.Duration) (*credentials.Credentials, error) {
// Credentials Path must be provided
if credentialsPath == "" {
return nil, awserr.New("EKSCredentialsPathRequired", "Credentials File Path is required!", nil)
}
// Credentials Path must exist!
if _, err := os.Stat(credentialsPath); os.IsNotExist(err) {
return nil, awserr.New("EKSCredentialsFileNotFound", "Credentials File Not Found.", nil)
}
// Duration cannot be more than one hour and less than one second
if refreshDuration < time.Second || refreshDuration > time.Hour {
refreshDuration = 15 * time.Minute
}
p := credentialsProvider{
credentialsPath: credentialsPath,
refreshDuration: refreshDuration,
}
return credentials.NewCredentials(&p), nil
}
func (p *credentialsProvider) Retrieve() (credentials.Value, error) {
creds, awsRefreshTime, roleArn, err := p.loadFromDisk()
if err != nil {
return credentials.Value{ProviderName: "EKSCredentialsProvider"}, err
}
p.awsRefreshTime = awsRefreshTime
p.roleArn = roleArn
p.nextReadTime = time.Now().UTC().Add(p.refreshDuration)
return creds, nil
}
func (p *credentialsProvider) IsExpired() bool {
now := time.Now().UTC()
return now.After(p.nextReadTime) || now.After(p.awsRefreshTime)
}
func (p *credentialsProvider) AwsRefreshTime() time.Time {
return p.awsRefreshTime
}
func (p *credentialsProvider) RemainingUntilAwsRefreshTime() time.Duration {
now := time.Now().UTC()
return p.awsRefreshTime.Sub(now)
}
func (p *credentialsProvider) RemainingSecondsUntilAwsRefreshTime() float64 {
return p.RemainingUntilAwsRefreshTime().Seconds()
}
func (p *credentialsProvider) RoleArn() string {
return p.roleArn
}
// use default profile
// https://github.com/aws/aws-sdk-go/blob/master/aws/credentials/shared_credentials_provider.go
func (p *credentialsProvider) loadFromDisk() (credentials.Value, time.Time, string, error) {
config, err := ini.Load(p.credentialsPath)
if err != nil {
return credentials.Value{ProviderName: "EKSCredentialsProvider"},
time.Now().UTC(),
"",
awserr.New("EKSCredentialsLoadFailure", "Failed to load credentials file!", err)
}
iniProfile, err := config.GetSection("default")
if err != nil {
return credentials.Value{ProviderName: "EKSCredentialsProvider"},
time.Now().UTC(),
"",
awserr.New("EKSCredentialsLoadFailure", "Failed to load default DefaultProfile", err)
}
id, err := iniProfile.GetKey("aws_access_key_id")
if err != nil {
return credentials.Value{ProviderName: "EKSCredentialsProvider"},
time.Now().UTC(),
"",
awserr.New("EKSCredentialsMissingAccessKey",
fmt.Sprintf("Credentials %s in %s did not contain aws_access_key_id", "default", p.credentialsPath),
err)
}
secret, err := iniProfile.GetKey("aws_secret_access_key")
if err != nil {
return credentials.Value{ProviderName: "EKSCredentialsProvider"},
time.Now().UTC(),
"",
awserr.New("EKSCredentialsMissingSecret",
fmt.Sprintf("Credentials %s in %s did not contain aws_secret_access_key", "default", p.credentialsPath),
err)
}
token, err := iniProfile.GetKey("aws_session_token")
if err != nil {
return credentials.Value{ProviderName: "EKSCredentialsProvider"},
time.Now().UTC(),
"",
awserr.New("EKSCredentialsMissingToken",
fmt.Sprintf("Credentials %s in %s did not contain aws_session_token", "default", p.credentialsPath),
err)
}
// Role ARN may be empty. Default to empty string if not found
roleArn := strings.TrimSpace(iniProfile.Key("aws_role_arn").String())
// Parse AWS Refresh Time
awsRefreshTime := parseAwsRefreshTime(iniProfile)
return credentials.Value{
AccessKeyID: id.String(),
SecretAccessKey: secret.String(),
SessionToken: token.String(),
ProviderName: "EKSCredentialsProvider",
}, awsRefreshTime, roleArn, nil
}
func parseAwsRefreshTime(iniProfile *ini.Section) time.Time {
v := time.Now().UTC().Add(15 * time.Minute)
rs := strings.TrimSpace(iniProfile.Key("aws_refresh_time").String())
if rs != "" {
n, err := strconv.ParseInt(rs, 10, 64)
if err == nil && n > 0 {
v = time.Unix(n, 0).In(time.UTC)
}
}
return v
}