31 lines
814 B
Go
31 lines
814 B
Go
package main
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import (
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"crypto"
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"crypto/rand"
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"fmt"
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"net/http"
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"strings"
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"time"
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)
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type Signer struct {
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key crypto.Signer
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keyID string
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}
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// Sign modifies the request, computing and setting the Signature header, and setting the Date header to the provided time.
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func (s Signer) Sign(r *http.Request, date time.Time) error {
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host := r.URL.Host
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path := r.URL.Path
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method := strings.ToLower(r.Method)
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stringToSign := fmt.Sprintf("(request-target): %s %s\nhost: %s\ndate: %s", method, path, host, date.Format(time.RFC1123))
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sig, err := s.key.Sign(rand.Reader, []byte(stringToSign), nil)
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if err != nil {
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return err
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}
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r.Header.Set("Date", date.Format(time.RFC1123))
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r.Header.Set("Signature", fmt.Sprintf(`keyId="%s",headers="(request-target) host date",signature="%s"`, s.keyID, sig))
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return nil
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}
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