66 lines
1.4 KiB
Go
66 lines
1.4 KiB
Go
package machine
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import (
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"crypto/hmac"
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"crypto/sha256"
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"encoding/hex"
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"fmt"
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"strings"
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"github.com/evcc-io/evcc/util"
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"github.com/denisbrodbeck/machineid"
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)
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var id string
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// CustomID sets the machine id to a custom value
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func CustomID(cid string) error {
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if id != "" {
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panic("machine id already generated")
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}
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cid = strings.TrimSpace(cid)
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if l := len(cid); l != 32 {
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return fmt.Errorf("expected 32 characters machine id, got %d", l)
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}
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id = cid
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return nil
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}
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// ID returns the platform specific machine id of the current host OS.
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// If ID cannot be generated, a random value is suggested.
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func ID() (string, error) {
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if id == "" {
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var err error
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if id, err = machineid.ID(); err != nil {
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rnd := util.RandomString(512)
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mac := hmac.New(sha256.New, []byte(rnd))
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rid := hex.EncodeToString(mac.Sum(nil))
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return "", fmt.Errorf("could not get %w; for manual configuration use plant: %s", err, rid)
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}
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}
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return id, nil
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}
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// ProtectedID returns a hashed version of the machine id
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// using a fixed, application-specific key.
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func ProtectedID(key string) (string, error) {
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id, err := machineid.ID()
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if err != nil {
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return id, err
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}
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return protect(key, id), nil
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}
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// protect calculates HMAC-SHA256 of the id, keyed by key and returns a hex-encoded string
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func protect(key, id string) string {
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mac := hmac.New(sha256.New, []byte(id))
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mac.Write([]byte(key))
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return hex.EncodeToString(mac.Sum(nil))
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}
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