110 lines
2.1 KiB
Go
110 lines
2.1 KiB
Go
package acme
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import (
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"bytes"
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"crypto"
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rsa"
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"fmt"
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"net/http"
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"gopkg.in/square/go-jose.v1"
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)
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type jws struct {
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directoryURL string
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privKey crypto.PrivateKey
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nonces []string
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}
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func keyAsJWK(key interface{}) *jose.JsonWebKey {
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switch k := key.(type) {
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case *ecdsa.PublicKey:
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return &jose.JsonWebKey{Key: k, Algorithm: "EC"}
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case *rsa.PublicKey:
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return &jose.JsonWebKey{Key: k, Algorithm: "RSA"}
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default:
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return nil
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}
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}
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// Posts a JWS signed message to the specified URL
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func (j *jws) post(url string, content []byte) (*http.Response, error) {
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signedContent, err := j.signContent(content)
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if err != nil {
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return nil, err
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}
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resp, err := httpPost(url, "application/jose+json", bytes.NewBuffer([]byte(signedContent.FullSerialize())))
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if err != nil {
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return nil, err
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}
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j.getNonceFromResponse(resp)
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return resp, err
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}
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func (j *jws) signContent(content []byte) (*jose.JsonWebSignature, error) {
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var alg jose.SignatureAlgorithm
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switch k := j.privKey.(type) {
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case *rsa.PrivateKey:
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alg = jose.RS256
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case *ecdsa.PrivateKey:
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if k.Curve == elliptic.P256() {
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alg = jose.ES256
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} else if k.Curve == elliptic.P384() {
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alg = jose.ES384
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}
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}
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signer, err := jose.NewSigner(alg, j.privKey)
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if err != nil {
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return nil, err
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}
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signer.SetNonceSource(j)
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signed, err := signer.Sign(content)
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if err != nil {
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return nil, err
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}
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return signed, nil
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}
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func (j *jws) getNonceFromResponse(resp *http.Response) error {
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nonce := resp.Header.Get("Replay-Nonce")
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if nonce == "" {
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return fmt.Errorf("Server did not respond with a proper nonce header.")
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}
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j.nonces = append(j.nonces, nonce)
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return nil
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}
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func (j *jws) getNonce() error {
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resp, err := httpHead(j.directoryURL)
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if err != nil {
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return err
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}
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return j.getNonceFromResponse(resp)
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}
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func (j *jws) Nonce() (string, error) {
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nonce := ""
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if len(j.nonces) == 0 {
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err := j.getNonce()
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if err != nil {
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return nonce, err
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}
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}
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if len(j.nonces) == 0 {
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return "", fmt.Errorf("Can't get nonce")
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}
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nonce, j.nonces = j.nonces[len(j.nonces)-1], j.nonces[:len(j.nonces)-1]
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return nonce, nil
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}
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