42 lines
887 B
Go
42 lines
887 B
Go
package websub
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import (
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"crypto/hmac"
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"crypto/sha1"
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"encoding/hex"
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"fmt"
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"strings"
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"github.com/pkg/errors"
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)
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// ValidateHubSignature validate a sha1 signature that could be send with the
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// hub as an extra header
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func ValidateHubSignature(sig string, feedContent, secret []byte) error {
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parts := strings.Split(sig, "=")
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if len(parts) != 2 {
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return errors.New("signature format is not like sha1=signature")
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}
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if parts[0] != "sha1" {
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return errors.New("signature format is not like sha1=signature")
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}
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// verification
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mac := hmac.New(sha1.New, secret)
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mac.Write(feedContent)
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signature := mac.Sum(nil)
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signature2, err := hex.DecodeString(parts[1])
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if err != nil {
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return errors.Wrap(err, "could not decode signature")
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}
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if !hmac.Equal(signature, signature2) {
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return fmt.Errorf("signature does not match feed %s %s", signature, parts[1])
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}
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return nil
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}
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