diff options
Diffstat (limited to 'internal/ui/decoder.go')
| -rw-r--r-- | internal/ui/decoder.go | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/internal/ui/decoder.go b/internal/ui/decoder.go new file mode 100644 index 0000000..c5c0653 --- /dev/null +++ b/internal/ui/decoder.go @@ -0,0 +1,254 @@ +package ui + +import ( + "crypto/md5" + "crypto/sha1" + "crypto/sha256" + "encoding/base64" + "encoding/hex" + "encoding/json" + "fmt" + "html" + "net/url" + "strings" + + "fyne.io/fyne/v2" + "fyne.io/fyne/v2/container" + "fyne.io/fyne/v2/layout" + "fyne.io/fyne/v2/widget" +) + +type decoderOperation struct { + name string + fwdLabel string // label for the forward button + bwdLabel string // label for the backward button; empty = no backward + forward func(string) string + backward func(string) (string, error) // nil = one-way +} + +var decoderOps = []decoderOperation{ + { + name: "URL Encode / Decode", + fwdLabel: "Encode →", + bwdLabel: "← Decode", + forward: url.QueryEscape, + backward: func(s string) (string, error) { return url.QueryUnescape(s) }, + }, + { + name: "URL Path Encode / Decode", + fwdLabel: "Encode →", + bwdLabel: "← Decode", + forward: url.PathEscape, + backward: func(s string) (string, error) { return url.PathUnescape(s) }, + }, + { + name: "Base64 Encode / Decode", + fwdLabel: "Encode →", + bwdLabel: "← Decode", + forward: func(s string) string { return base64.StdEncoding.EncodeToString([]byte(s)) }, + backward: func(s string) (string, error) { + s = strings.TrimSpace(s) + b, err := base64.StdEncoding.DecodeString(s) + if err != nil { + b, err = base64.URLEncoding.DecodeString(s) + } + return string(b), err + }, + }, + { + name: "Base64 URL-safe Encode / Decode", + fwdLabel: "Encode →", + bwdLabel: "← Decode", + forward: func(s string) string { return base64.URLEncoding.EncodeToString([]byte(s)) }, + backward: func(s string) (string, error) { + b, err := base64.URLEncoding.DecodeString(strings.TrimSpace(s)) + return string(b), err + }, + }, + { + name: "Hex Encode / Decode", + fwdLabel: "Encode →", + bwdLabel: "← Decode", + forward: func(s string) string { return hex.EncodeToString([]byte(s)) }, + backward: func(s string) (string, error) { + b, err := hex.DecodeString(strings.ReplaceAll(strings.TrimSpace(s), " ", "")) + return string(b), err + }, + }, + { + name: "HTML Entity Encode / Decode", + fwdLabel: "Encode →", + bwdLabel: "← Decode", + forward: html.EscapeString, + backward: func(s string) (string, error) { return html.UnescapeString(s), nil }, + }, + { + name: "JSON Pretty / Minify", + fwdLabel: "Pretty →", + bwdLabel: "← Minify", + forward: func(s string) string { + var v any + if err := json.Unmarshal([]byte(s), &v); err != nil { + return "Error: " + err.Error() + } + var buf strings.Builder + enc := json.NewEncoder(&buf) + enc.SetIndent("", " ") + if err := enc.Encode(v); err != nil { + return "Error: " + err.Error() + } + return strings.TrimRight(buf.String(), "\n") + }, + backward: func(s string) (string, error) { + var v any + if err := json.Unmarshal([]byte(s), &v); err != nil { + return "", err + } + b, err := json.Marshal(v) + return string(b), err + }, + }, + { + name: "JWT Decode (no verify)", + fwdLabel: "Decode →", + forward: func(s string) string { + parts := strings.Split(strings.TrimSpace(s), ".") + if len(parts) < 2 { + return "Error: not a JWT (expected header.payload.signature)" + } + var result strings.Builder + for i, part := range parts[:min(2, len(parts))] { + label := []string{"Header", "Payload"}[i] + b, err := base64.RawURLEncoding.DecodeString(part) + if err != nil { + result.WriteString(fmt.Sprintf("=== %s ===\nError: %v\n\n", label, err)) + continue + } + result.WriteString(fmt.Sprintf("=== %s ===\n%s\n\n", label, string(PrettyJSON(b)))) + } + if len(parts) >= 3 { + result.WriteString(fmt.Sprintf("=== Signature ===\n%s", parts[2])) + } + return result.String() + }, + }, + { + name: "MD5 Hash", + fwdLabel: "Hash →", + forward: func(s string) string { + h := md5.Sum([]byte(s)) + return hex.EncodeToString(h[:]) + }, + }, + { + name: "SHA1 Hash", + fwdLabel: "Hash →", + forward: func(s string) string { + h := sha1.Sum([]byte(s)) + return hex.EncodeToString(h[:]) + }, + }, + { + name: "SHA256 Hash", + fwdLabel: "Hash →", + forward: func(s string) string { + h := sha256.Sum256([]byte(s)) + return hex.EncodeToString(h[:]) + }, + }, +} + +type decoderTab struct{} + +func newDecoderTab() *decoderTab { return &decoderTab{} } + +func (d *decoderTab) build() fyne.CanvasObject { + inputEntry := widget.NewMultiLineEntry() + inputEntry.SetPlaceHolder("Input...") + inputEntry.TextStyle = fyne.TextStyle{Monospace: true} + inputEntry.Wrapping = fyne.TextWrapOff + + outputEntry := widget.NewMultiLineEntry() + outputEntry.SetPlaceHolder("Output...") + outputEntry.TextStyle = fyne.TextStyle{Monospace: true} + outputEntry.Wrapping = fyne.TextWrapOff + + opNames := make([]string, len(decoderOps)) + for i, op := range decoderOps { + opNames[i] = op.name + } + + selectedIdx := 0 + + fwdBtn := widget.NewButton(decoderOps[0].fwdLabel, nil) + fwdBtn.Importance = widget.HighImportance + + bwdBtn := widget.NewButton("← Decode", nil) + + fwdBtn.OnTapped = func() { + op := decoderOps[selectedIdx] + outputEntry.SetText(op.forward(inputEntry.Text)) + } + bwdBtn.OnTapped = func() { + op := decoderOps[selectedIdx] + if op.backward == nil { + return + } + result, err := op.backward(inputEntry.Text) + if err != nil { + outputEntry.SetText("Error: " + err.Error()) + return + } + outputEntry.SetText(result) + } + + opSelect := widget.NewSelect(opNames, func(s string) { + for i, op := range decoderOps { + if op.name == s { + selectedIdx = i + fwdBtn.SetText(op.fwdLabel) + if op.backward != nil { + bwdBtn.SetText(op.bwdLabel) + bwdBtn.Show() + } else { + bwdBtn.Hide() + } + return + } + } + }) + opSelect.SetSelected(opNames[0]) + + // SHA1/MD5/SHA256/JWT have no backward — hide decode button initially if needed. + if decoderOps[0].backward == nil { + bwdBtn.Hide() + } + + swapBtn := widget.NewButton("⇅ Swap", func() { + in := inputEntry.Text + inputEntry.SetText(outputEntry.Text) + outputEntry.SetText(in) + }) + + copyBtn := widget.NewButton("Copy Output", func() { + fyne.CurrentApp().Clipboard().SetContent(outputEntry.Text) + }) + + toolbar := container.NewBorder(nil, nil, + container.NewHBox(fwdBtn, bwdBtn), + container.NewHBox(swapBtn, copyBtn), + opSelect, + ) + + inputPane := container.NewBorder(newBoldLabel("Input"), nil, nil, nil, inputEntry) + outputPane := container.NewBorder(newBoldLabel("Output"), nil, nil, nil, outputEntry) + + split := container.NewVSplit(inputPane, outputPane) + split.SetOffset(0.5) + + return container.NewBorder( + container.New(layout.NewCustomPaddedLayout(8, 8, 0, 0), toolbar), + nil, nil, nil, + split, + ) +} |