99 lines
2.5 KiB
Go
99 lines
2.5 KiB
Go
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package auroradns
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import (
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"crypto/hmac"
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"crypto/sha256"
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"encoding/base64"
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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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// TokenTransport HTTP transport for API authentication
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type TokenTransport struct {
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userID string
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key string
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// Transport is the underlying HTTP transport to use when making requests.
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// It will default to http.DefaultTransport if nil.
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Transport http.RoundTripper
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}
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// NewTokenTransport Creates a new TokenTransport
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func NewTokenTransport(userID, key string) (*TokenTransport, error) {
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if userID == "" || key == "" {
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return nil, fmt.Errorf("credentials missing")
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}
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return &TokenTransport{userID: userID, key: key}, nil
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}
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// RoundTrip executes a single HTTP transaction
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func (t *TokenTransport) RoundTrip(req *http.Request) (*http.Response, error) {
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enrichedReq := &http.Request{}
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*enrichedReq = *req
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enrichedReq.Header = make(http.Header, len(req.Header))
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for k, s := range req.Header {
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enrichedReq.Header[k] = append([]string(nil), s...)
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}
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if t.userID != "" && t.key != "" {
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timestamp := time.Now().UTC()
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fmtTime := timestamp.Format("20060102T150405Z")
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req.Header.Set("X-AuroraDNS-Date", fmtTime)
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token, err := newToken(t.userID, t.key, req.Method, req.URL.Path, timestamp)
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if err == nil {
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req.Header.Set("Authorization", fmt.Sprintf("AuroraDNSv1 %s", token))
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}
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}
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return t.transport().RoundTrip(enrichedReq)
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}
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// Wrap Wrap a HTTP client Transport with the TokenTransport
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func (t *TokenTransport) Wrap(client *http.Client) *http.Client {
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backup := client.Transport
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t.Transport = backup
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client.Transport = t
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return client
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}
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// Client Creates a new HTTP client
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func (t *TokenTransport) Client() *http.Client {
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return &http.Client{
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Transport: t,
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Timeout: 30 * time.Second,
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}
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}
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func (t *TokenTransport) transport() http.RoundTripper {
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if t.Transport != nil {
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return t.Transport
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}
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return http.DefaultTransport
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}
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// newToken generates a token for accessing a specific method of the API
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func newToken(userID string, key string, method string, action string, timestamp time.Time) (string, error) {
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fmtTime := timestamp.Format("20060102T150405Z")
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message := strings.Join([]string{method, action, fmtTime}, "")
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signatureHmac := hmac.New(sha256.New, []byte(key))
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_, err := signatureHmac.Write([]byte(message))
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if err != nil {
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return "", err
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}
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signature := base64.StdEncoding.EncodeToString(signatureHmac.Sum(nil))
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userIDAndSignature := fmt.Sprintf("%s:%s", userID, signature)
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token := base64.StdEncoding.EncodeToString([]byte(userIDAndSignature))
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return token, nil
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}
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