263 lines
7.4 KiB
Go
263 lines
7.4 KiB
Go
// Copyright 2026 The Go MCP SDK Authors. All rights reserved.
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// Use of this source code is governed by the license
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// that can be found in the LICENSE file.
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package extauth
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import (
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"context"
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"fmt"
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"net/http"
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"net/url"
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"strings"
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"testing"
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"github.com/modelcontextprotocol/go-sdk/auth"
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"github.com/modelcontextprotocol/go-sdk/internal/oauthtest"
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"github.com/modelcontextprotocol/go-sdk/oauthex"
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"golang.org/x/oauth2"
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)
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const testRedirectURL = "http://localhost:18927/callback"
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func validOIDCLoginConfig(issuerURL string) *OIDCLoginConfig {
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return &OIDCLoginConfig{
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IssuerURL: issuerURL,
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Credentials: &oauthex.ClientCredentials{
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ClientID: "test-client",
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ClientSecretAuth: &oauthex.ClientSecretAuth{
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ClientSecret: "test-secret",
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},
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},
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RedirectURL: testRedirectURL,
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Scopes: []string{"openid", "profile", "email"},
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}
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}
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func TestPerformOIDCLogin(t *testing.T) {
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idpServer := oauthtest.NewFakeIdPServer(oauthtest.IdPConfig{
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PreregisteredClients: map[string]oauthtest.ClientInfo{
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"test-client": {
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Secret: "test-secret",
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RedirectURIs: []string{testRedirectURL},
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},
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},
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})
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idpServer.Start(t)
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config := validOIDCLoginConfig(idpServer.URL())
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// fetchAuthCode visits the authorization URL on the fake IdP server,
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// follows the redirect, and extracts the authorization code and state.
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fetchAuthCode := func(ctx context.Context, args *auth.AuthorizationArgs) (*auth.AuthorizationResult, error) {
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client := &http.Client{
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CheckRedirect: func(req *http.Request, via []*http.Request) error {
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return http.ErrUseLastResponse
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},
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}
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resp, err := client.Get(args.URL)
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if err != nil {
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return nil, fmt.Errorf("failed to visit auth URL: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusFound {
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return nil, fmt.Errorf("expected redirect, got status %d", resp.StatusCode)
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}
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loc, err := resp.Location()
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if err != nil {
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return nil, fmt.Errorf("missing Location header: %w", err)
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}
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return &auth.AuthorizationResult{
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Code: loc.Query().Get("code"),
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State: loc.Query().Get("state"),
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}, nil
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}
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verifyOIDCToken := func(token *oauth2.Token) error {
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idToken, ok := token.Extra("id_token").(string)
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if !ok || idToken == "" {
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return fmt.Errorf("id_token is missing or empty")
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}
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parts := strings.Split(idToken, ".")
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if len(parts) != 3 {
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return fmt.Errorf("id_token is not a JWT (expected 3 parts, got %d)", len(parts))
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}
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if token.AccessToken == "" {
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return fmt.Errorf("access token is empty")
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}
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if token.TokenType != "Bearer" {
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return fmt.Errorf("token type = %q, want %q", token.TokenType, "Bearer")
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}
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return nil
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}
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t.Run("successful flow", func(t *testing.T) {
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token, err := PerformOIDCLogin(context.Background(), config, fetchAuthCode)
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if err != nil {
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t.Fatalf("PerformOIDCLogin() error = %v", err)
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}
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if err := verifyOIDCToken(token); err != nil {
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t.Errorf("invalid token returned: %v", err)
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}
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})
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t.Run("with login_hint", func(t *testing.T) {
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configWithHint := *config
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configWithHint.LoginHint = "user@example.com"
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token, err := PerformOIDCLogin(context.Background(), &configWithHint,
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func(ctx context.Context, args *auth.AuthorizationArgs) (*auth.AuthorizationResult, error) {
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u, err := url.Parse(args.URL)
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if err != nil {
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return nil, fmt.Errorf("invalid authURL: %w", err)
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}
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if got := u.Query().Get("login_hint"); got != "user@example.com" {
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t.Errorf("login_hint = %q, want %q", got, "user@example.com")
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}
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return fetchAuthCode(ctx, args)
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})
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if err != nil {
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t.Fatalf("PerformOIDCLogin() error = %v", err)
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}
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if err := verifyOIDCToken(token); err != nil {
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t.Errorf("invalid token returned: %v", err)
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}
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})
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t.Run("without login_hint", func(t *testing.T) {
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token, err := PerformOIDCLogin(context.Background(), config,
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func(ctx context.Context, args *auth.AuthorizationArgs) (*auth.AuthorizationResult, error) {
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u, err := url.Parse(args.URL)
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if err != nil {
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return nil, fmt.Errorf("invalid authURL: %w", err)
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}
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if u.Query().Has("login_hint") {
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t.Errorf("login_hint should be absent, got %q", u.Query().Get("login_hint"))
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}
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return fetchAuthCode(ctx, args)
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})
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if err != nil {
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t.Fatalf("PerformOIDCLogin() error = %v", err)
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}
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if err := verifyOIDCToken(token); err != nil {
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t.Errorf("invalid token returned: %v", err)
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}
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})
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t.Run("state mismatch", func(t *testing.T) {
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_, err := PerformOIDCLogin(context.Background(), config,
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func(ctx context.Context, args *auth.AuthorizationArgs) (*auth.AuthorizationResult, error) {
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return &auth.AuthorizationResult{
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Code: "mock-auth-code",
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State: "wrong-state",
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}, nil
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})
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if err == nil {
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t.Fatal("expected error for state mismatch, got nil")
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}
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if !strings.Contains(err.Error(), "state mismatch") {
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t.Errorf("error = %v, want error containing %q", err, "state mismatch")
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}
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})
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t.Run("fetcher error", func(t *testing.T) {
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_, err := PerformOIDCLogin(context.Background(), config,
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func(ctx context.Context, args *auth.AuthorizationArgs) (*auth.AuthorizationResult, error) {
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return nil, fmt.Errorf("user cancelled")
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})
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if err == nil {
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t.Fatal("expected error, got nil")
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}
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if !strings.Contains(err.Error(), "user cancelled") {
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t.Errorf("error = %v, want error containing %q", err, "user cancelled")
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}
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})
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}
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func TestPerformOIDCLogin_ValidationErrors(t *testing.T) {
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const nonexistentIssuer = "https://idp.example.com"
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noopFetcher := func(ctx context.Context, args *auth.AuthorizationArgs) (*auth.AuthorizationResult, error) {
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return nil, fmt.Errorf("should not be called")
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}
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tests := []struct {
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name string
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config *OIDCLoginConfig
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fetcher auth.AuthorizationCodeFetcher
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wantErr string
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}{
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{
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name: "nil config",
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config: nil,
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fetcher: noopFetcher,
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wantErr: "config is required",
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},
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{
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name: "nil fetcher",
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config: validOIDCLoginConfig(nonexistentIssuer),
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fetcher: nil,
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wantErr: "authCodeFetcher is required",
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},
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{
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name: "missing IssuerURL",
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config: validOIDCLoginConfig(""),
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fetcher: noopFetcher,
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wantErr: "IssuerURL is required",
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},
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{
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name: "missing ClientID",
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config: func() *OIDCLoginConfig {
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c := validOIDCLoginConfig(nonexistentIssuer)
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c.Credentials = &oauthex.ClientCredentials{}
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return c
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}(),
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fetcher: noopFetcher,
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wantErr: "ClientID is required",
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},
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{
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name: "missing RedirectURL",
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config: func() *OIDCLoginConfig {
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c := validOIDCLoginConfig(nonexistentIssuer)
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c.RedirectURL = ""
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return c
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}(),
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fetcher: noopFetcher,
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wantErr: "RedirectURL is required",
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},
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{
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name: "missing Scopes",
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config: func() *OIDCLoginConfig {
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c := validOIDCLoginConfig(nonexistentIssuer)
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c.Scopes = nil
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return c
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}(),
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fetcher: noopFetcher,
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wantErr: "at least one scope is required",
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},
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{
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name: "missing openid scope",
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config: func() *OIDCLoginConfig {
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c := validOIDCLoginConfig(nonexistentIssuer)
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c.Scopes = []string{"profile", "email"}
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return c
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}(),
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fetcher: noopFetcher,
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wantErr: "openid",
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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_, err := PerformOIDCLogin(context.Background(), tt.config, tt.fetcher)
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if err == nil {
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t.Fatalf("expected error containing %q, got nil", tt.wantErr)
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}
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if !strings.Contains(err.Error(), tt.wantErr) {
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t.Errorf("error = %v, want error containing %q", err, tt.wantErr)
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}
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})
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}
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}
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