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| 1 | +// Copyright 2025 The Go MCP SDK Authors. All rights reserved. |
| 2 | +// Use of this source code is governed by an MIT-style |
| 3 | +// license that can be found in the LICENSE file. |
| 4 | + |
| 5 | +//go:build mcp_go_client_oauth |
| 6 | + |
| 7 | +package auth |
| 8 | + |
| 9 | +import ( |
| 10 | + "context" |
| 11 | + "errors" |
| 12 | + "fmt" |
| 13 | + "net/http" |
| 14 | + "net/http/httptest" |
| 15 | + "testing" |
| 16 | + |
| 17 | + "golang.org/x/oauth2" |
| 18 | +) |
| 19 | + |
| 20 | +// TestHTTPTransport validates the OAuth HTTPTransport. |
| 21 | +func TestHTTPTransport(t *testing.T) { |
| 22 | + const testToken = "test-token-123" |
| 23 | + fakeTokenSource := oauth2.StaticTokenSource(&oauth2.Token{ |
| 24 | + AccessToken: testToken, |
| 25 | + TokenType: "Bearer", |
| 26 | + }) |
| 27 | + |
| 28 | + // authServer simulates a resource that requires OAuth. |
| 29 | + authServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 30 | + authHeader := r.Header.Get("Authorization") |
| 31 | + if authHeader == fmt.Sprintf("Bearer %s", testToken) { |
| 32 | + w.WriteHeader(http.StatusOK) |
| 33 | + return |
| 34 | + } |
| 35 | + |
| 36 | + w.Header().Set("WWW-Authenticate", `Bearer resource_metadata="http://metadata.example.com"`) |
| 37 | + w.WriteHeader(http.StatusUnauthorized) |
| 38 | + })) |
| 39 | + defer authServer.Close() |
| 40 | + |
| 41 | + t.Run("successful auth flow", func(t *testing.T) { |
| 42 | + var handlerCalls int |
| 43 | + handler := func(ctx context.Context, args OAuthHandlerArgs) (oauth2.TokenSource, error) { |
| 44 | + handlerCalls++ |
| 45 | + if args.ResourceMetadataURL != "http://metadata.example.com" { |
| 46 | + t.Errorf("handler got metadata URL %q, want %q", args.ResourceMetadataURL, "http://metadata.example.com") |
| 47 | + } |
| 48 | + return fakeTokenSource, nil |
| 49 | + } |
| 50 | + |
| 51 | + transport, err := NewHTTPTransport(handler, nil) |
| 52 | + if err != nil { |
| 53 | + t.Fatalf("NewHTTPTransport() failed: %v", err) |
| 54 | + } |
| 55 | + client := &http.Client{Transport: transport} |
| 56 | + |
| 57 | + resp, err := client.Get(authServer.URL) |
| 58 | + if err != nil { |
| 59 | + t.Fatalf("client.Get() failed: %v", err) |
| 60 | + } |
| 61 | + defer resp.Body.Close() |
| 62 | + |
| 63 | + if resp.StatusCode != http.StatusOK { |
| 64 | + t.Errorf("got status %d, want %d", resp.StatusCode, http.StatusOK) |
| 65 | + } |
| 66 | + if handlerCalls != 1 { |
| 67 | + t.Errorf("handler was called %d times, want 1", handlerCalls) |
| 68 | + } |
| 69 | + |
| 70 | + // Second request should reuse the token and not call the handler again. |
| 71 | + resp2, err := client.Get(authServer.URL) |
| 72 | + if err != nil { |
| 73 | + t.Fatalf("second client.Get() failed: %v", err) |
| 74 | + } |
| 75 | + defer resp2.Body.Close() |
| 76 | + |
| 77 | + if resp2.StatusCode != http.StatusOK { |
| 78 | + t.Errorf("second request got status %d, want %d", resp2.StatusCode, http.StatusOK) |
| 79 | + } |
| 80 | + if handlerCalls != 1 { |
| 81 | + t.Errorf("handler should still be called only once, but was %d", handlerCalls) |
| 82 | + } |
| 83 | + }) |
| 84 | + |
| 85 | + t.Run("handler returns error", func(t *testing.T) { |
| 86 | + handlerErr := errors.New("user rejected auth") |
| 87 | + handler := func(ctx context.Context, args OAuthHandlerArgs) (oauth2.TokenSource, error) { |
| 88 | + return nil, handlerErr |
| 89 | + } |
| 90 | + |
| 91 | + transport, err := NewHTTPTransport(handler, nil) |
| 92 | + if err != nil { |
| 93 | + t.Fatalf("NewHTTPTransport() failed: %v", err) |
| 94 | + } |
| 95 | + client := &http.Client{Transport: transport} |
| 96 | + |
| 97 | + _, err = client.Get(authServer.URL) |
| 98 | + if !errors.Is(err, handlerErr) { |
| 99 | + t.Errorf("client.Get() returned error %v, want %v", err, handlerErr) |
| 100 | + } |
| 101 | + }) |
| 102 | +} |
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