87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
package acctest
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import (
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"bufio"
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"bytes"
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crand "crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"encoding/pem"
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"fmt"
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"math/rand"
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"strings"
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"time"
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"golang.org/x/crypto/ssh"
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)
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// Helpers for generating random tidbits for use in identifiers to prevent
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// collisions in acceptance tests.
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// RandInt generates a random integer
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func RandInt() int {
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reseed()
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return rand.New(rand.NewSource(time.Now().UnixNano())).Int()
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}
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func RandIntRange(min int, max int) int {
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reseed()
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source := rand.New(rand.NewSource(time.Now().UnixNano()))
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rangeMax := max - min
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return int(source.Int31n(int32(rangeMax)))
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}
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// RandString generates a random alphanumeric string of the length specified
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func RandString(strlen int) string {
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return RandStringFromCharSet(strlen, CharSetAlphaNum)
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}
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// RandStringFromCharSet generates a random string by selecting characters from
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// the charset provided
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func RandStringFromCharSet(strlen int, charSet string) string {
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reseed()
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result := make([]byte, strlen)
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for i := 0; i < strlen; i++ {
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result[i] = charSet[rand.Intn(len(charSet))]
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}
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return string(result)
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}
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// RandSSHKeyPair generates a public and private SSH key pair. The public key is
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// returned in OpenSSH format, and the private key is PEM encoded.
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func RandSSHKeyPair(comment string) (string, string, error) {
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privateKey, err := rsa.GenerateKey(crand.Reader, 1024)
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if err != nil {
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return "", "", err
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}
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var privateKeyBuffer bytes.Buffer
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privateKeyPEM := &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(privateKey)}
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if err := pem.Encode(bufio.NewWriter(&privateKeyBuffer), privateKeyPEM); err != nil {
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return "", "", err
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}
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publicKey, err := ssh.NewPublicKey(&privateKey.PublicKey)
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if err != nil {
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return "", "", err
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}
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keyMaterial := strings.TrimSpace(string(ssh.MarshalAuthorizedKey(publicKey)))
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return fmt.Sprintf("%s %s", keyMaterial, comment), privateKeyBuffer.String(), nil
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}
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// Seeds random with current timestamp
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func reseed() {
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rand.Seed(time.Now().UTC().UnixNano())
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}
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const (
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// CharSetAlphaNum is the alphanumeric character set for use with
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// RandStringFromCharSet
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CharSetAlphaNum = "abcdefghijklmnopqrstuvwxyz012346789"
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// CharSetAlpha is the alphabetical character set for use with
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// RandStringFromCharSet
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CharSetAlpha = "abcdefghijklmnopqrstuvwxyz"
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)
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