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package ui
import (
"bufio"
"bytes"
"fmt"
"io"
"net/http"
"fyne.io/fyne/v2"
"fyne.io/fyne/v2/container"
"fyne.io/fyne/v2/theme"
"fyne.io/fyne/v2/widget"
"github.com/shiv/internal/logger"
"github.com/shiv/internal/store"
)
type interceptTab struct {
projectStore *store.Store
pending *store.PendingRequest
toggle *widget.Check
editor *widget.Entry
forward *widget.Button
drop *widget.Button
forwardAll *widget.Button
}
func newInterceptTab(projectStore *store.Store) *interceptTab {
return &interceptTab{projectStore: projectStore}
}
func (t *interceptTab) build() fyne.CanvasObject {
t.toggle = widget.NewCheck("Intercept ON", func(on bool) {
t.projectStore.Intercept.SetEnabled(on)
if !on {
// SetEnabled(false) triggers bypass internally — all goroutines
// blocked in Hold are released. We only need to handle whatever
// the UI is currently displaying.
if t.pending != nil {
old := t.pending
t.pending = nil
old.Reply <- store.Decision{Forward: true, Request: old.Request, Body: old.Body}
}
t.clearEditor()
}
})
t.editor = widget.NewMultiLineEntry()
t.editor.SetPlaceHolder("No request intercepted yet.")
t.editor.TextStyle = fyne.TextStyle{Monospace: true}
t.editor.Wrapping = fyne.TextWrapOff
t.editor.Disable()
t.forward = widget.NewButtonWithIcon("Forward", theme.ConfirmIcon(), func() {
t.decide(true)
})
t.drop = widget.NewButtonWithIcon("Drop", theme.DeleteIcon(), func() {
t.decide(false)
})
t.forwardAll = widget.NewButtonWithIcon("Forward All", theme.MediaFastForwardIcon(), func() {
// Forward whatever is currently displayed, then signal the gate to
// release all goroutines currently blocked in Hold. Future requests
// will be intercepted normally — ForwardAll is a one-shot release.
if t.pending != nil {
old := t.pending
t.pending = nil
old.Reply <- store.Decision{Forward: true, Request: old.Request, Body: old.Body}
}
t.clearEditor()
t.projectStore.Intercept.ForwardAll()
})
t.forward.Importance = widget.HighImportance
t.forward.Disable()
t.drop.Disable()
t.forwardAll.Disable()
scopeOnly := widget.NewCheck("Scope only", func(on bool) {
if on {
t.projectStore.Intercept.SetScopeFilter(t.projectStore.InScope)
} else {
t.projectStore.Intercept.SetScopeFilter(nil)
}
})
copyBtn := widget.NewButton("Copy", func() {
fyne.CurrentApp().Clipboard().SetContent(t.editor.Text)
})
buttons := container.NewHBox(t.forward, t.drop, t.forwardAll)
content := container.NewBorder(
container.NewVBox(
container.NewBorder(nil, nil,
container.NewHBox(t.toggle, scopeOnly),
copyBtn, nil),
widget.NewSeparator(),
),
buttons,
nil, nil,
t.editor,
)
go t.watchQueue()
return content
}
// watchQueue reads from the gate queue and presents requests to the UI one at
// a time. Cancelled pending (released by bypass before the UI processed them)
// are skipped via the double IsDone check — once on the watchQueue goroutine
// and once inside fyne.Do on the main goroutine.
func (t *interceptTab) watchQueue() {
for pending := range t.projectStore.Intercept.Queue() {
p := pending
// Fast path: already cancelled before we even schedule fyne.Do.
if p.IsDone() {
continue
}
fyne.Do(func() {
// Second check: may have been cancelled between the fast path above
// and this callback executing on the main goroutine.
if p.IsDone() {
return
}
t.showRequest(p)
})
}
}
func formatLiveRequest(req *http.Request, body []byte) string {
var builder bytes.Buffer
path := req.URL.RequestURI()
if path == "" {
path = "/"
}
fmt.Fprintf(&builder, "%s %s HTTP/1.1\r\n", req.Method, path)
fmt.Fprintf(&builder, "Host: %s\r\n", req.Host)
for headerKey, headerValues := range req.Header {
for _, headerValue := range headerValues {
fmt.Fprintf(&builder, "%s: %s\r\n", headerKey, headerValue)
}
}
builder.WriteString("\r\n")
if len(body) > 0 {
builder.Write(body)
}
return builder.String()
}
func (t *interceptTab) showRequest(p *store.PendingRequest) {
t.pending = p
t.editor.Enable()
t.editor.SetText(formatLiveRequest(p.Request, p.Body))
t.forward.Enable()
t.drop.Enable()
t.forwardAll.Enable()
}
func (t *interceptTab) decide(forward bool) {
if t.pending == nil {
return
}
pending := t.pending
rawText := t.editor.Text
t.pending = nil
t.clearEditor()
if forward {
req, body, err := parseRawRequest(rawText, pending.Request)
if err != nil {
logger.Error("intercept: parse edited request: %v — forwarding original", err)
req = pending.Request
body = pending.Body
}
pending.Reply <- store.Decision{Forward: true, Request: req, Body: body}
} else {
pending.Reply <- store.Decision{Forward: false, Request: pending.Request, Body: pending.Body}
}
}
func (t *interceptTab) clearEditor() {
t.editor.SetText("")
t.editor.Disable()
t.forward.Disable()
t.drop.Disable()
t.forwardAll.Disable()
}
func parseRawRequest(raw string, original *http.Request) (*http.Request, []byte, error) {
req, err := http.ReadRequest(bufio.NewReader(bytes.NewBufferString(raw)))
if err != nil {
return nil, nil, err
}
req.URL.Scheme = original.URL.Scheme
req.URL.Host = original.URL.Host
if req.Host == "" {
req.Host = original.Host
}
var body []byte
if req.Body != nil {
var err error
body, err = io.ReadAll(req.Body)
req.Body.Close()
if err != nil {
return nil, nil, fmt.Errorf("read request body: %w", err)
}
}
req.Body = http.NoBody
return req, body, nil
}
|
