39 lines
1.1 KiB
Go
39 lines
1.1 KiB
Go
package api
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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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)
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func isValidWebhook(message []byte, key string, signature string, component string) (bool, error) {
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if key == "" && signature == "" {
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// No webhook token configured and no signature header received. Skipping request validation.
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return true, nil
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}
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if key == "" && signature != "" {
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return false, fmt.Errorf("Signature header received but no %s webhook secret configured. Request rejected due to possible configuration mismatch.", component)
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}
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if key != "" && signature == "" {
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return false, fmt.Errorf("%s webhook secret configured but no signature header received. Request rejected due to possible configuration mismatch.", component)
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}
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decodedSignature, err := hex.DecodeString(signature)
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if err != nil {
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return false, fmt.Errorf("Error decoding signature for %s webhook.", component)
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}
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mac := hmac.New(sha256.New, []byte(key))
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mac.Write(message)
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sum := mac.Sum(nil)
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if !hmac.Equal(decodedSignature, sum) {
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return false, fmt.Errorf("Signature header does not match the received %s webhook content. Request rejected.", component)
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}
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return true, nil
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}
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