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package op
import (
"context"
"log/slog"
"net/http"
"net/url"
httphelper "github.com/zitadel/oidc/v3/pkg/http"
"github.com/zitadel/oidc/v3/pkg/oidc"
)
type Exchanger interface {
Storage() Storage
Decoder() httphelper.Decoder
Crypto() Crypto
AuthMethodPostSupported() bool
AuthMethodPrivateKeyJWTSupported() bool
GrantTypeRefreshTokenSupported() bool
GrantTypeTokenExchangeSupported() bool
GrantTypeJWTAuthorizationSupported() bool
GrantTypeClientCredentialsSupported() bool
GrantTypeDeviceCodeSupported() bool
AccessTokenVerifier(context.Context) *AccessTokenVerifier
IDTokenHintVerifier(context.Context) *IDTokenHintVerifier
Logger() *slog.Logger
}
func tokenHandler(exchanger Exchanger) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
ctx, span := tracer.Start(r.Context(), "tokenHandler")
defer span.End()
Exchange(w, r.WithContext(ctx), exchanger)
}
}
// Exchange performs a token exchange appropriate for the grant type
func Exchange(w http.ResponseWriter, r *http.Request, exchanger Exchanger) {
ctx, span := tracer.Start(r.Context(), "Exchange")
r = r.WithContext(ctx)
defer span.End()
grantType := r.FormValue("grant_type")
switch grantType {
case string(oidc.GrantTypeCode):
CodeExchange(w, r, exchanger)
return
case string(oidc.GrantTypeRefreshToken):
if exchanger.GrantTypeRefreshTokenSupported() {
RefreshTokenExchange(w, r, exchanger)
return
}
case string(oidc.GrantTypeBearer):
if ex, ok := exchanger.(JWTAuthorizationGrantExchanger); ok && exchanger.GrantTypeJWTAuthorizationSupported() {
JWTProfile(w, r, ex)
return
}
case string(oidc.GrantTypeTokenExchange):
if exchanger.GrantTypeTokenExchangeSupported() {
TokenExchange(w, r, exchanger)
return
}
case string(oidc.GrantTypeClientCredentials):
if exchanger.GrantTypeClientCredentialsSupported() {
ClientCredentialsExchange(w, r, exchanger)
return
}
case string(oidc.GrantTypeDeviceCode):
if exchanger.GrantTypeDeviceCodeSupported() {
DeviceAccessToken(w, r, exchanger)
return
}
case "":
RequestError(w, r, oidc.ErrInvalidRequest().WithDescription("grant_type missing"), exchanger.Logger())
return
}
RequestError(w, r, oidc.ErrUnsupportedGrantType().WithDescription("%s not supported", grantType), exchanger.Logger())
}
// AuthenticatedTokenRequest is a helper interface for ParseAuthenticatedTokenRequest
// it is implemented by oidc.AuthRequest and oidc.RefreshTokenRequest
type AuthenticatedTokenRequest interface {
SetClientID(string)
SetClientSecret(string)
}
// ParseAuthenticatedTokenRequest parses the client_id and client_secret from the HTTP request from either
// HTTP Basic Auth header or form body and sets them into the provided authenticatedTokenRequest interface
func ParseAuthenticatedTokenRequest(r *http.Request, decoder httphelper.Decoder, request AuthenticatedTokenRequest) error {
ctx, span := tracer.Start(r.Context(), "ParseAuthenticatedTokenRequest")
defer span.End()
r = r.WithContext(ctx)
err := r.ParseForm()
if err != nil {
return oidc.ErrInvalidRequest().WithDescription("error parsing form").WithParent(err)
}
err = decoder.Decode(request, r.Form)
if err != nil {
return oidc.ErrInvalidRequest().WithDescription("error decoding form").WithParent(err)
}
clientID, clientSecret, ok := r.BasicAuth()
if !ok {
return nil
}
clientID, err = url.QueryUnescape(clientID)
if err != nil {
return oidc.ErrInvalidClient().WithDescription("invalid basic auth header").WithParent(err)
}
clientSecret, err = url.QueryUnescape(clientSecret)
if err != nil {
return oidc.ErrInvalidClient().WithDescription("invalid basic auth header").WithParent(err)
}
request.SetClientID(clientID)
request.SetClientSecret(clientSecret)
return nil
}
// AuthorizeClientIDSecret authorizes a client by validating the client_id and client_secret (Basic Auth and POST)
func AuthorizeClientIDSecret(ctx context.Context, clientID, clientSecret string, storage Storage) error {
ctx, span := tracer.Start(ctx, "AuthorizeClientIDSecret")
defer span.End()
err := storage.AuthorizeClientIDSecret(ctx, clientID, clientSecret)
if err != nil {
return oidc.ErrInvalidClient().WithDescription("invalid client_id / client_secret").WithParent(err)
}
return nil
}
// AuthorizeCodeChallenge authorizes a client by validating the code_verifier against the previously sent
// code_challenge of the auth request (PKCE)
func AuthorizeCodeChallenge(codeVerifier string, challenge *oidc.CodeChallenge) error {
if codeVerifier == "" {
return oidc.ErrInvalidRequest().WithDescription("code_challenge required")
}
if !oidc.VerifyCodeChallenge(challenge, codeVerifier) {
return oidc.ErrInvalidGrant().WithDescription("invalid code challenge")
}
return nil
}
// AuthorizePrivateJWTKey authorizes a client by validating the client_assertion's signature with a previously
// registered public key (JWT Profile)
func AuthorizePrivateJWTKey(ctx context.Context, clientAssertion string, exchanger JWTAuthorizationGrantExchanger) (Client, error) {
ctx, span := tracer.Start(ctx, "AuthorizePrivateJWTKey")
defer span.End()
jwtReq, err := VerifyJWTAssertion(ctx, clientAssertion, exchanger.JWTProfileVerifier(ctx))
if err != nil {
return nil, err
}
client, err := exchanger.Storage().GetClientByClientID(ctx, jwtReq.Issuer)
if err != nil {
return nil, err
}
if client.AuthMethod() != oidc.AuthMethodPrivateKeyJWT {
return nil, oidc.ErrInvalidClient()
}
return client, nil
}
// ValidateGrantType ensures that the requested grant_type is allowed by the client
func ValidateGrantType(client interface{ GrantTypes() []oidc.GrantType }, grantType oidc.GrantType) bool {
if client == nil {
return false
}
for _, grant := range client.GrantTypes() {
if grantType == grant {
return true
}
}
return false
}
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