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71 lines
2.4 KiB
Go
71 lines
2.4 KiB
Go
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package rdsutils
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import (
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"net/http"
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"strings"
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"time"
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"github.com/aws/aws-sdk-go/aws/credentials"
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"github.com/aws/aws-sdk-go/aws/signer/v4"
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)
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// BuildAuthToken will return a authentication token for the database's connect
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// based on the RDS database endpoint, AWS region, IAM user or role, and AWS credentials.
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//
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// Endpoint consists of the hostname and port, IE hostname:port, of the RDS database.
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// Region is the AWS region the RDS database is in and where the authentication token
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// will be generated for. DbUser is the IAM user or role the request will be authenticated
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// for. The creds is the AWS credentials the authentication token is signed with.
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//
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// An error is returned if the authentication token is unable to be signed with
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// the credentials, or the endpoint is not a valid URL.
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//
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// The following example shows how to use BuildAuthToken to create an authentication
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// token for connecting to a MySQL database in RDS.
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//
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// authToken, err := BuildAuthToken(dbEndpoint, awsRegion, dbUser, awsCreds)
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//
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// // Create the MySQL DNS string for the DB connection
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// // user:password@protocol(endpoint)/dbname?<params>
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// dnsStr = fmt.Sprintf("%s:%s@tcp(%s)/%s?tls=true",
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// dbUser, authToken, dbEndpoint, dbName,
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// )
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//
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// // Use db to perform SQL operations on database
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// db, err := sql.Open("mysql", dnsStr)
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//
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// See http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/UsingWithRDS.IAMDBAuth.html
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// for more information on using IAM database authentication with RDS.
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func BuildAuthToken(endpoint, region, dbUser string, creds *credentials.Credentials) (string, error) {
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// the scheme is arbitrary and is only needed because validation of the URL requires one.
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if !(strings.HasPrefix(endpoint, "http://") || strings.HasPrefix(endpoint, "https://")) {
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endpoint = "https://" + endpoint
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}
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req, err := http.NewRequest("GET", endpoint, nil)
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if err != nil {
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return "", err
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}
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values := req.URL.Query()
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values.Set("Action", "connect")
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values.Set("DBUser", dbUser)
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req.URL.RawQuery = values.Encode()
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signer := v4.Signer{
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Credentials: creds,
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}
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_, err = signer.Presign(req, nil, "rds-db", region, 15*time.Minute, time.Now())
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if err != nil {
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return "", err
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}
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url := req.URL.String()
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if strings.HasPrefix(url, "http://") {
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url = url[len("http://"):]
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} else if strings.HasPrefix(url, "https://") {
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url = url[len("https://"):]
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}
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return url, nil
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}
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