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token_source.go
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/
token_source.go
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package conductoronesdkgo
import (
"bytes"
"context"
"crypto/ed25519"
"encoding/base64"
"errors"
"net"
"net/http"
"net/url"
"strings"
"time"
"github.com/grpc-ecosystem/go-grpc-middleware/logging/zap/ctxzap"
"github.com/pquerna/xjwt"
"golang.org/x/oauth2"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"gopkg.in/square/go-jose.v2"
"gopkg.in/square/go-jose.v2/json"
"gopkg.in/square/go-jose.v2/jwt"
"github.com/conductorone/conductorone-sdk-go/uhttp"
)
const (
assertionType = "urn:ietf:params:oauth:client-assertion-type:jwt-bearer"
)
var (
ErrInvalidClientSecret = errors.New("invalid client secret")
ErrInvalidClientID = errors.New("invalid client id")
v1SecretTokenIdentifier = []byte("v1")
)
type c1Token struct {
AccessToken string `json:"access_token"`
TokenType string `json:"token_type"`
Expiry int `json:"expires_in"`
}
type c1TokenSource struct {
clientID string
clientSecret *jose.JSONWebKey
tokenHost string
httpClient *http.Client
}
func parseSecret(input []byte) (*jose.JSONWebKey, error) {
items := bytes.SplitN(input, []byte(":"), 4)
if len(items) != 4 {
return nil, ErrInvalidClientSecret
}
if !bytes.Equal(items[2], v1SecretTokenIdentifier) {
return nil, ErrInvalidClientSecret
}
jwkData, err := base64.RawURLEncoding.DecodeString(string(items[3]))
if err != nil {
return nil, ErrInvalidClientSecret
}
npk := &jose.JSONWebKey{}
err = npk.UnmarshalJSON(jwkData)
if err != nil {
return nil, ErrInvalidClientSecret
}
if npk.IsPublic() || !npk.Valid() {
return nil, ErrInvalidClientSecret
}
_, ok := npk.Key.(ed25519.PrivateKey)
if !ok {
return nil, ErrInvalidClientSecret
}
return npk, nil
}
func (c *c1TokenSource) Token() (*oauth2.Token, error) {
jsigner, err := jose.NewSigner(
jose.SigningKey{
Algorithm: jose.EdDSA,
Key: c.clientSecret,
},
&jose.SignerOptions{
NonceSource: &xjwt.RandomNonce{Size: 16},
})
if err != nil {
return nil, err
}
// Our token host may include a port, but the audience never expects a port
aud := c.tokenHost
host, _, err := net.SplitHostPort(aud)
if err == nil {
aud = host
}
now := time.Now()
claims := &jwt.Claims{
Issuer: c.clientID,
Subject: c.clientID,
Audience: jwt.Audience{aud},
Expiry: jwt.NewNumericDate(now.Add(time.Minute * 2)),
IssuedAt: jwt.NewNumericDate(now),
NotBefore: jwt.NewNumericDate(now.Add(-time.Minute * 2)),
}
b, err := json.Marshal(claims)
if err != nil {
return nil, err
}
rv, err := jsigner.Sign(b)
if err != nil {
return nil, err
}
s, err := rv.CompactSerialize()
if err != nil {
return nil, err
}
body := url.Values{
"client_id": []string{c.clientID},
"grant_type": []string{"client_credentials"},
"client_assertion_type": []string{assertionType},
"client_assertion": []string{s},
}
tokenUrl := url.URL{
Scheme: "https",
Host: c.tokenHost,
Path: "auth/v1/token",
}
req, err := http.NewRequestWithContext(context.Background(), http.MethodPost, tokenUrl.String(), strings.NewReader(body.Encode()))
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
resp, err := c.httpClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, status.Errorf(codes.Unauthenticated, "failed to get token: %s", resp.Status)
}
c1t := &c1Token{}
err = json.NewDecoder(resp.Body).Decode(c1t)
if err != nil {
return nil, err
}
if c1t.AccessToken == "" {
return nil, status.Errorf(codes.Unauthenticated, "failed to get token: empty access token")
}
return &oauth2.Token{
AccessToken: c1t.AccessToken,
TokenType: c1t.TokenType,
Expiry: time.Now().Add(time.Duration(c1t.Expiry) * time.Second),
}, nil
}
func NewTokenSource(ctx context.Context, clientID string, clientSecret string, tokenHost string) (oauth2.TokenSource, error) {
secret, err := parseSecret([]byte(clientSecret))
if err != nil {
return nil, err
}
httpClient, err := uhttp.NewClient(ctx, uhttp.WithLogger(true, ctxzap.Extract(ctx)), uhttp.WithUserAgent("cone-c1-credential-provider"))
if err != nil {
return nil, err
}
return oauth2.ReuseTokenSource(nil, &c1TokenSource{
clientID: clientID,
clientSecret: secret,
tokenHost: strings.TrimPrefix(tokenHost, "https://"),
httpClient: httpClient,
}), nil
}