package command
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import (
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"crypto/rand"
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"encoding/base64"
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"fmt"
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"strings"
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"github.com/mitchellh/cli"
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)
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// KeygenCommand is a Command implementation that generates an encryption
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// key for use in `serf agent`.
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type KeygenCommand struct {
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Ui cli.Ui
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}
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var _ cli.Command = &KeygenCommand{}
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func (c *KeygenCommand) Run(_ []string) int {
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key := make([]byte, 16)
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n, err := rand.Reader.Read(key)
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if err != nil {
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c.Ui.Error(fmt.Sprintf("Error reading random data: %s", err))
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return 1
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}
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if n != 16 {
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c.Ui.Error(fmt.Sprintf("Couldn't read enough entropy. Generate more entropy!"))
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return 1
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}
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c.Ui.Output(base64.StdEncoding.EncodeToString(key))
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return 0
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}
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func (c *KeygenCommand) Synopsis() string {
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return "Generates a new encryption key"
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}
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func (c *KeygenCommand) Help() string {
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helpText := `
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Usage: serf keygen
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Generates a new encryption key that can be used to configure the
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agent to encrypt traffic. The output of this command is already
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in the proper format that the agent expects.
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`
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return strings.TrimSpace(helpText)
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}
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