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package rdsutils
import (
"net/http"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/signer/v4"
)
// BuildAuthToken will return an authorization token used as the password for a DB
// connection.
//
// * endpoint - Endpoint consists of the port needed to connect to the DB. <host>:<port>
// * region - Region is the location of where the DB is
// * dbUser - User account within the database to sign in with
// * creds - Credentials to be signed with
//
// The following example shows how to use BuildAuthToken to create an authentication
// token for connecting to a MySQL database in RDS.
//
// authToken, err := BuildAuthToken(dbEndpoint, awsRegion, dbUser, awsCreds)
//
// // Create the MySQL DNS string for the DB connection
// // user:password@protocol(endpoint)/dbname?<params>
// connectStr = fmt.Sprintf("%s:%s@tcp(%s)/%s?allowCleartextPasswords=true&tls=rds",
// dbUser, authToken, dbEndpoint, dbName,
// )
//
// // Use db to perform SQL operations on database
// db, err := sql.Open("mysql", connectStr)
//
// See http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/UsingWithRDS.IAMDBAuth.html
// for more information on using IAM database authentication with RDS.
func BuildAuthToken(endpoint, region, dbUser string, creds *credentials.Credentials) (string, error) {
// the scheme is arbitrary and is only needed because validation of the URL requires one.
if !(strings.HasPrefix(endpoint, "http://") || strings.HasPrefix(endpoint, "https://")) {
endpoint = "https://" + endpoint
}
req, err := http.NewRequest("GET", endpoint, nil)
if err != nil {
return "", err
}
values := req.URL.Query()
values.Set("Action", "connect")
values.Set("DBUser", dbUser)
req.URL.RawQuery = values.Encode()
signer := v4.Signer{
Credentials: creds,
}
_, err = signer.Presign(req, nil, "rds-db", region, 15*time.Minute, time.Now())
if err != nil {
return "", err
}
url := req.URL.String()
if strings.HasPrefix(url, "http://") {
url = url[len("http://"):]
} else if strings.HasPrefix(url, "https://") {
url = url[len("https://"):]
}
return url, nil
}