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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,
)
}
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