forked from TrueCloudLab/lego
78 lines
1.5 KiB
Go
78 lines
1.5 KiB
Go
package nonces // import "github.com/xenolf/lego/acme/api/internal/nonces"
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import (
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"errors"
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"fmt"
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"net/http"
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"sync"
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"github.com/xenolf/lego/acme/api/internal/sender"
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)
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// Manager Manages nonces.
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type Manager struct {
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do *sender.Doer
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nonceURL string
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nonces []string
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sync.Mutex
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}
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// NewManager Creates a new Manager.
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func NewManager(do *sender.Doer, nonceURL string) *Manager {
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return &Manager{
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do: do,
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nonceURL: nonceURL,
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}
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}
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// Pop Pops a nonce.
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func (n *Manager) Pop() (string, bool) {
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n.Lock()
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defer n.Unlock()
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if len(n.nonces) == 0 {
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return "", false
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}
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nonce := n.nonces[len(n.nonces)-1]
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n.nonces = n.nonces[:len(n.nonces)-1]
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return nonce, true
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}
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// Push Pushes a nonce.
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func (n *Manager) Push(nonce string) {
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n.Lock()
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defer n.Unlock()
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n.nonces = append(n.nonces, nonce)
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}
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// Nonce implement jose.NonceSource
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func (n *Manager) Nonce() (string, error) {
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if nonce, ok := n.Pop(); ok {
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return nonce, nil
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}
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return n.getNonce()
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}
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func (n *Manager) getNonce() (string, error) {
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resp, err := n.do.Head(n.nonceURL)
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if err != nil {
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return "", fmt.Errorf("failed to get nonce from HTTP HEAD -> %v", err)
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}
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return GetFromResponse(resp)
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}
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// GetFromResponse Extracts a nonce from a HTTP response.
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func GetFromResponse(resp *http.Response) (string, error) {
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if resp == nil {
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return "", errors.New("nil response")
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}
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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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return nonce, nil
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}
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