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package crypto
import (
"crypto"
"net/http"
"net/url"
"time"
"github.com/go-fed/httpsig"
)
// SignResponse will sign a response using the provided response body and public key.
func SignResponse(w http.ResponseWriter, body []byte, publicKey PublicKey) error {
privateKey := GetPrivateKey()
return signResponse(privateKey, *publicKey.ID, body, w)
}
func signResponse(privateKey crypto.PrivateKey, pubKeyID url.URL, body []byte, w http.ResponseWriter) error {
prefs := []httpsig.Algorithm{httpsig.RSA_SHA256}
digestAlgorithm := httpsig.DigestSha256
// The "Date" and "Digest" headers must already be set on r, as well as r.URL.
headersToSign := []string{}
if body != nil {
headersToSign = append(headersToSign, "digest")
}
signer, _, err := httpsig.NewSigner(prefs, digestAlgorithm, headersToSign, httpsig.Signature, 0)
if err != nil {
return err
}
// If r were a http.ResponseWriter, call SignResponse instead.
return signer.SignResponse(privateKey, pubKeyID.String(), w, body)
}
// SignRequest will sign an ounbound request given the provided body.
func SignRequest(req *http.Request, body []byte, actorIRI *url.URL) error {
publicKey := GetPublicKey(actorIRI)
privateKey := GetPrivateKey()
return signRequest(privateKey, publicKey.ID.String(), body, req)
}
func signRequest(privateKey crypto.PrivateKey, pubKeyID string, body []byte, r *http.Request) error {
prefs := []httpsig.Algorithm{httpsig.RSA_SHA256}
digestAlgorithm := httpsig.DigestSha256
date := time.Now().UTC().Format("Mon, 02 Jan 2006 15:04:05 GMT")
r.Header["Date"] = []string{date}
r.Header["Host"] = []string{r.URL.Host}
r.Header["Accept"] = []string{`application/ld+json; profile="https://www.w3.org/ns/activitystreams"`}
// The "Date" and "Digest" headers must already be set on r, as well as r.URL.
headersToSign := []string{httpsig.RequestTarget, "host", "date"}
if body != nil {
headersToSign = append(headersToSign, "digest")
}
signer, _, err := httpsig.NewSigner(prefs, digestAlgorithm, headersToSign, httpsig.Signature, 0)
if err != nil {
return err
}
// If r were a http.ResponseWriter, call SignResponse instead.
return signer.SignRequest(privateKey, pubKeyID, r, body)
}