| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "encoding/base64" |
| 6 | "encoding/binary" |
| 7 | "hash/crc32" |
| 8 | "net/http" |
| 9 | "net/http/httptest" |
| 10 | "os" |
| 11 | "path/filepath" |
| 12 | "runtime" |
| 13 | "strings" |
| 14 | "testing" |
| 15 | ) |
| 16 | |
| 17 | var markdownImageTestPNG, _ = base64.StdEncoding.DecodeString("iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY42YAAAAASUVORK5CYII=") |
| 18 | |
| 19 | func markdownImageTestPNGConfig(width, height uint32) []byte { |
| 20 | var out bytes.Buffer |
| 21 | out.Write([]byte("\x89PNG\r\n\x1a\n")) |
| 22 | _ = binary.Write(&out, binary.BigEndian, uint32(13)) |
| 23 | chunk := make([]byte, 17) |
| 24 | copy(chunk, "IHDR") |
| 25 | binary.BigEndian.PutUint32(chunk[4:8], width) |
| 26 | binary.BigEndian.PutUint32(chunk[8:12], height) |
| 27 | chunk[12] = 8 // bit depth |
| 28 | chunk[13] = 6 // RGBA |
| 29 | out.Write(chunk) |
| 30 | _ = binary.Write(&out, binary.BigEndian, crc32.ChecksumIEEE(chunk)) |
| 31 | return out.Bytes() |
| 32 | } |
| 33 | |
| 34 | func TestResolveMarkdownImageForTabWorkspaceAndRemotePolicy(t *testing.T) { |
| 35 | original, _ := os.Getwd() |
| 36 | defer os.Chdir(original) |
| 37 | workspace := t.TempDir() |
| 38 | if err := os.Chdir(workspace); err != nil { |
| 39 | t.Fatal(err) |
| 40 | } |
| 41 | if err := os.MkdirAll("docs", 0o755); err != nil { |
| 42 | t.Fatal(err) |
| 43 | } |
| 44 | if err := os.WriteFile(filepath.Join("docs", "screen shot.png"), markdownImageTestPNG, 0o644); err != nil { |
| 45 | t.Fatal(err) |
| 46 | } |
| 47 | |
| 48 | app := NewApp() |
| 49 | local := app.ResolveMarkdownImageForTab("", "docs/screen%20shot.png") |
| 50 | if local.ErrorCode != "" || !strings.HasPrefix(local.URL, "/__reasonix_workspace_media/") || local.Mime != "image/png" { |
| 51 | t.Fatalf("local image = %+v", local) |
| 52 | } |
| 53 | if strings.HasPrefix(local.URL, "file:") || !strings.HasPrefix(local.OpenHref, "file://") { |
| 54 | t.Fatalf("local URL/open href boundary = %+v", local) |
| 55 | } |
| 56 | |
| 57 | remote := app.ResolveMarkdownImageForTab("", "https://cdn.example.com/a.png#fragment") |
| 58 | if remote.ErrorCode != "" || !strings.HasPrefix(remote.URL, remoteMarkdownImagePath+"?url=") || strings.Contains(remote.OpenHref, "#") { |
| 59 | t.Fatalf("remote image = %+v", remote) |
| 60 | } |
| 61 | if blocked := app.ResolveMarkdownImageForTab("", "http://localhost/private.png"); blocked.ErrorCode != "blocked-remote" || blocked.URL != "" { |
| 62 | t.Fatalf("localhost image was not blocked: %+v", blocked) |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | func TestResolveMarkdownImageSelectsPercentAndSpaceNamesExactly(t *testing.T) { |
| 67 | original, _ := os.Getwd() |
| 68 | defer os.Chdir(original) |
| 69 | workspace := t.TempDir() |
| 70 | if err := os.Chdir(workspace); err != nil { |
| 71 | t.Fatal(err) |
| 72 | } |
| 73 | percentBody := append(append([]byte(nil), markdownImageTestPNG...), []byte("percent-file")...) |
| 74 | spaceBody := append(append([]byte(nil), markdownImageTestPNG...), []byte("space-file")...) |
| 75 | if err := os.WriteFile("raw%20name.png", percentBody, 0o644); err != nil { |
| 76 | t.Fatal(err) |
| 77 | } |
| 78 | if err := os.WriteFile("raw name.png", spaceBody, 0o644); err != nil { |
| 79 | t.Fatal(err) |
| 80 | } |
| 81 | app := NewApp() |
| 82 | handler := app.workspaceMediaMiddleware()(http.NotFoundHandler()) |
| 83 | for _, tc := range []struct { |
| 84 | source string |
| 85 | name string |
| 86 | body []byte |
| 87 | }{ |
| 88 | {source: "raw%2520name.png", name: "raw%20name.png", body: percentBody}, |
| 89 | {source: "raw%20name.png", name: "raw name.png", body: spaceBody}, |
| 90 | } { |
| 91 | view := app.ResolveMarkdownImageForTab("", tc.source) |
| 92 | if view.ErrorCode != "" || view.Filename != tc.name { |
| 93 | t.Fatalf("resolve %q = %+v", tc.source, view) |
| 94 | } |
| 95 | recorder := httptest.NewRecorder() |
| 96 | handler.ServeHTTP(recorder, httptest.NewRequest(http.MethodGet, view.URL, nil)) |
| 97 | if recorder.Code != http.StatusOK || !bytes.Equal(recorder.Body.Bytes(), tc.body) { |
| 98 | t.Fatalf("GET %q = %d %q, want exact %q", view.URL, recorder.Code, recorder.Body.Bytes(), tc.body) |
| 99 | } |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | func TestResolveMarkdownImageForTabRejectsTraversalAndSymlinkEscape(t *testing.T) { |
| 104 | original, _ := os.Getwd() |
| 105 | defer os.Chdir(original) |
| 106 | parent := t.TempDir() |
| 107 | workspace := filepath.Join(parent, "workspace") |
| 108 | if err := os.Mkdir(workspace, 0o755); err != nil { |
| 109 | t.Fatal(err) |
| 110 | } |
| 111 | outside := filepath.Join(parent, "outside.png") |
| 112 | if err := os.WriteFile(outside, markdownImageTestPNG, 0o644); err != nil { |
| 113 | t.Fatal(err) |
| 114 | } |
| 115 | if err := os.Chdir(workspace); err != nil { |
| 116 | t.Fatal(err) |
| 117 | } |
| 118 | app := NewApp() |
| 119 | if view := app.ResolveMarkdownImageForTab("", "../outside.png"); view.ErrorCode != "forbidden" { |
| 120 | t.Fatalf("traversal view = %+v", view) |
| 121 | } |
| 122 | |
| 123 | link := filepath.Join(workspace, "escape.png") |
| 124 | if err := os.Symlink(outside, link); err != nil { |
| 125 | if runtime.GOOS == "windows" { |
| 126 | t.Skipf("symlink unavailable: %v", err) |
| 127 | } |
| 128 | t.Fatal(err) |
| 129 | } |
| 130 | if view := app.ResolveMarkdownImageForTab("", "escape.png"); view.ErrorCode != "forbidden" { |
| 131 | t.Fatalf("symlink escape view = %+v", view) |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | func TestResolveMarkdownDataImageMatrix(t *testing.T) { |
| 136 | app := NewApp() |
| 137 | png := "data:image/png;base64," + base64.StdEncoding.EncodeToString(markdownImageTestPNG) |
| 138 | if view := app.ResolveMarkdownImageForTab("", png); view.ErrorCode != "" || view.URL != png || view.Mime != "image/png" { |
| 139 | t.Fatalf("valid data image = %+v", view) |
| 140 | } |
| 141 | for name, source := range map[string]string{ |
| 142 | "svg": "data:image/svg+xml;base64," + base64.StdEncoding.EncodeToString([]byte("<svg/>")), |
| 143 | "mime mismatch": "data:image/jpeg;base64," + base64.StdEncoding.EncodeToString(markdownImageTestPNG), |
| 144 | "malformed": "data:image/png;base64,%%%", |
| 145 | } { |
| 146 | t.Run(name, func(t *testing.T) { |
| 147 | if view := app.ResolveMarkdownImageForTab("", source); view.ErrorCode == "" || view.URL != "" { |
| 148 | t.Fatalf("unsafe data image = %+v", view) |
| 149 | } |
| 150 | }) |
| 151 | } |
| 152 | tooLarge := "data:image/png;base64," + strings.Repeat("A", markdownDataImageMaxEncodedBytes) |
| 153 | if view := app.ResolveMarkdownImageForTab("", tooLarge); view.ErrorCode != "too-large" { |
| 154 | t.Fatalf("oversized data image = %+v", view) |
| 155 | } |
| 156 | tooManyPixels := "data:image/png;base64," + base64.StdEncoding.EncodeToString(markdownImageTestPNGConfig(10_000, 4_001)) |
| 157 | if view := app.ResolveMarkdownImageForTab("", tooManyPixels); view.ErrorCode != "too-large" { |
| 158 | t.Fatalf("oversized decoded image = %+v", view) |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | func TestResolveMarkdownImageForTabRejectsLargeLocalImages(t *testing.T) { |
| 163 | original, _ := os.Getwd() |
| 164 | defer os.Chdir(original) |
| 165 | workspace := t.TempDir() |
| 166 | if err := os.Chdir(workspace); err != nil { |
| 167 | t.Fatal(err) |
| 168 | } |
| 169 | app := NewApp() |
| 170 | |
| 171 | largeFile := filepath.Join(workspace, "large.png") |
| 172 | f, err := os.Create(largeFile) |
| 173 | if err != nil { |
| 174 | t.Fatal(err) |
| 175 | } |
| 176 | if err := f.Truncate(remoteMarkdownImageMaxBytes + 1); err != nil { |
| 177 | _ = f.Close() |
| 178 | t.Fatal(err) |
| 179 | } |
| 180 | if err := f.Close(); err != nil { |
| 181 | t.Fatal(err) |
| 182 | } |
| 183 | if view := app.ResolveMarkdownImageForTab("", "large.png"); view.ErrorCode != "too-large" || view.OpenHref == "" { |
| 184 | t.Fatalf("large local image = %+v", view) |
| 185 | } |
| 186 | |
| 187 | if err := os.WriteFile("wide.png", markdownImageTestPNGConfig(20_000, 2_001), 0o644); err != nil { |
| 188 | t.Fatal(err) |
| 189 | } |
| 190 | if view := app.ResolveMarkdownImageForTab("", "wide.png"); view.ErrorCode != "too-large" || view.OpenHref == "" { |
| 191 | t.Fatalf("large decoded local image = %+v", view) |
| 192 | } |
| 193 | } |
| 194 |