1 files changed, 283 insertions, 0 deletions
diff --git a/internal/ui/browser.go b/internal/ui/browser.go
new file mode 100644
index 0000000..2dddb0f
--- /dev/null
+++ b/internal/ui/browser.go
@@ -0,0 +1,283 @@
+package ui
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"runtime"
+	"strings"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/dialog"
+
+	"github.com/shiv/internal/logger"
+)
+
+const prefKeyDefaultBrowser = "default_browser"
+
+// DetectedBrowser holds a browser's display name and executable path.
+type DetectedBrowser struct {
+	Name string
+	Path string
+}
+
+// isFirefox returns true if the executable looks like Firefox.
+func isFirefox(path string) bool {
+	base := strings.ToLower(filepath.Base(path))
+	return strings.Contains(base, "firefox")
+}
+
+// DetectBrowsers scans the system for supported browsers and returns all found.
+func DetectBrowsers() []DetectedBrowser {
+	switch runtime.GOOS {
+	case "linux":
+		return detectBrowsersLinux()
+	case "darwin":
+		return detectBrowsersDarwin()
+	case "windows":
+		return detectBrowsersWindows()
+	}
+	return nil
+}
+
+func detectBrowsersLinux() []DetectedBrowser {
+	candidates := []struct{ name, bin string }{
+		{"Google Chrome", "google-chrome"},
+		{"Google Chrome (stable)", "google-chrome-stable"},
+		{"Chromium", "chromium"},
+		{"Chromium (browser)", "chromium-browser"},
+		{"Brave (Browser)", "brave-browser"},
+		{"Brave", "brave"},
+		{"Microsoft Edge", "microsoft-edge"},
+		{"Vivaldi", "vivaldi"},
+		{"Vivaldi (stable)", "vivaldi-Stable"},
+		{"Opera", "opera"},
+		{"Opera (stable)", "opera-stable"},
+		{"Opera (browser)", "opera-browser"},
+		{"Firefox", "firefox"},
+		{"Firefox ESR", "firefox-esr"},
+	}
+	var found []DetectedBrowser
+	seen := map[string]bool{}
+	for _, c := range candidates {
+		path, err := exec.LookPath(c.bin)
+		if err != nil {
+			continue
+		}
+		if seen[path] {
+			continue
+		}
+		seen[path] = true
+		found = append(found, DetectedBrowser{Name: c.name, Path: path})
+	}
+	return found
+}
+
+func detectBrowsersDarwin() []DetectedBrowser {
+	candidates := []struct{ name, app string }{
+		{"Google Chrome", "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"},
+		{"Chromium", "/Applications/Chromium.app/Contents/MacOS/Chromium"},
+		{"Brave", "/Applications/Brave Browser.app/Contents/MacOS/Brave Browser"},
+		{"Microsoft Edge", "/Applications/Microsoft Edge.app/Contents/MacOS/Microsoft Edge"},
+		{"Vivaldi", "/Applications/Vivaldi.app/Contents/MacOS/Vivaldi"},
+		{"Opera", "/Applications/Opera.app/Contents/MacOS/Opera"},
+		{"Firefox", "/Applications/Firefox.app/Contents/MacOS/firefox"},
+	}
+	var found []DetectedBrowser
+	for _, c := range candidates {
+		if _, err := os.Stat(c.app); err == nil {
+			found = append(found, DetectedBrowser{Name: c.name, Path: c.app})
+		}
+	}
+	return found
+}
+
+func detectBrowsersWindows() []DetectedBrowser {
+	candidates := []struct{ name, path string }{
+		{"Google Chrome", `C:\Program Files\Google\Chrome\Application\chrome.exe`},
+		{"Google Chrome (x86)", `C:\Program Files (x86)\Google\Chrome\Application\chrome.exe`},
+		{"Chromium", `C:\Program Files\Chromium\Application\chrome.exe`},
+		{"Brave", `C:\Program Files\BraveSoftware\Brave-Browser\Application\brave.exe`},
+		{"Microsoft Edge", `C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe`},
+		{"Vivaldi", `C:\Program Files\Vivaldi\Application\vivaldi.exe`},
+		{"Opera", `C:\Program Files\Opera\opera.exe`},
+		{"Firefox", `C:\Program Files\Mozilla Firefox\firefox.exe`},
+		{"Firefox (x86)", `C:\Program Files (x86)\Mozilla Firefox\firefox.exe`},
+	}
+	var found []DetectedBrowser
+	seen := map[string]bool{}
+	for _, c := range candidates {
+		if _, err := os.Stat(c.path); err == nil {
+			if !seen[c.path] {
+				seen[c.path] = true
+				found = append(found, DetectedBrowser{Name: c.name, Path: c.path})
+			}
+		}
+	}
+	return found
+}
+
+// profileDir returns the persistent browser profile directory for the given browser executable.
+func profileDir(fyneApp fyne.App, browserPath string) string {
+	root := fyneApp.Storage().RootURI().Path()
+	if isFirefox(browserPath) {
+		return filepath.Join(root, "browser-profile-firefox")
+	}
+	return filepath.Join(root, "browser-profile-chrome")
+}
+
+// setupFirefoxProfile creates a Firefox profile dir with proxy settings written into user.js.
+func setupFirefoxProfile(profilePath, proxyHost string, proxyPort int) error {
+	if err := os.MkdirAll(profilePath, 0700); err != nil {
+		return fmt.Errorf("create firefox profile dir: %w", err)
+	}
+	userJS := fmt.Sprintf(`// Shiv proxy profile — auto-generated, do not edit manually.
+user_pref("network.proxy.type", 1);
+user_pref("network.proxy.http", "%s");
+user_pref("network.proxy.http_port", %d);
+user_pref("network.proxy.ssl", "%s");
+user_pref("network.proxy.ssl_port", %d);
+user_pref("network.proxy.no_proxies_on", "");
+user_pref("browser.startup.homepage_override.mstone", "ignore");
+user_pref("browser.shell.checkDefaultBrowser", false);
+user_pref("extensions.enabledScopes", 0);
+user_pref("extensions.autoDisableScopes", 15);
+user_pref("network.stricttransportsecurity.preloadlist", false);
+user_pref("security.enterprise_roots.enabled", true);
+`, proxyHost, proxyPort, proxyHost, proxyPort)
+	return os.WriteFile(filepath.Join(profilePath, "user.js"), []byte(userJS), 0600)
+}
+
+// LaunchBrowser launches the given browser pointed at the proxy with an isolated profile.
+func LaunchBrowser(fyneApp fyne.App, browser DetectedBrowser, proxyHost string, proxyPort int) error {
+	profile := profileDir(fyneApp, browser.Path)
+	proxyAddr := fmt.Sprintf("%s:%d", proxyHost, proxyPort)
+
+	var args []string
+
+	if isFirefox(browser.Path) {
+		if err := setupFirefoxProfile(profile, proxyHost, proxyPort); err != nil {
+			return err
+		}
+		args = []string{
+			"-profile", profile,
+			"-no-remote",
+		}
+	} else {
+		// Chromium-based — profile dir is created automatically by the browser.
+		args = []string{
+			"--proxy-server=http://" + proxyAddr,
+			"--user-data-dir=" + profile,
+			"--no-first-run",
+			"--no-default-browser-check",
+			"--disable-extensions",
+			"--disable-sync",
+			"--disable-background-networking",
+			"--disable-default-apps",
+			"--disable-component-update",
+			"--disable-breakpad",
+			"--metrics-recording-only",
+			"--disable-features=OptimizationHints,MediaRouter",
+		}
+	}
+
+	cmd := exec.Command(browser.Path, args...)
+	cmd.Stderr = nil
+	cmd.Stdout = nil
+	if err := cmd.Start(); err != nil {
+		return fmt.Errorf("launch browser: %w", err)
+	}
+
+	logger.Info("browser: launched %s (pid %d) via %s", browser.Name, cmd.Process.Pid, proxyAddr)
+
+	// Detach — we don't want to wait for the browser to exit.
+	go func() {
+		err := cmd.Wait()
+		if err != nil {
+			logger.Error("browser exited early: %v", err)
+		}
+	}()
+	return nil
+}
+
+// ClearBrowserProfile deletes the stored profile for the given browser executable.
+func ClearBrowserProfile(fyneApp fyne.App, browserPath string) error {
+	profile := profileDir(fyneApp, browserPath)
+	if err := os.RemoveAll(profile); err != nil {
+		return fmt.Errorf("clear browser profile: %w", err)
+	}
+	return nil
+}
+
+// launchDefaultBrowser reads the saved default browser from prefs and launches it.
+// If no default is set it shows a picker dialog first.
+func launchDefaultBrowser(fyneApp fyne.App, win fyne.Window) {
+	prefs := fyneApp.Preferences()
+	proxyHost := prefs.StringWithFallback(prefKeyProxyHost, defaultProxyHost)
+	proxyPort := prefs.IntWithFallback(prefKeyProxyPort, defaultProxyPort)
+
+	savedPath := prefs.String(prefKeyDefaultBrowser)
+	if savedPath != "" {
+		// Verify it still exists.
+		if _, err := os.Stat(savedPath); err == nil {
+			browser := DetectedBrowser{Name: filepath.Base(savedPath), Path: savedPath}
+			if err := LaunchBrowser(fyneApp, browser, proxyHost, proxyPort); err != nil {
+				dialog.ShowError(err, win)
+			}
+			return
+		}
+		// Saved browser no longer exists — fall through to picker.
+		prefs.SetString(prefKeyDefaultBrowser, "")
+	}
+
+	browsers := DetectBrowsers()
+	if len(browsers) == 0 {
+		dialog.ShowInformation("No Browser Found",
+			"No supported browser was detected on your system.\nInstall Chrome, Brave, Firefox, or another Chromium-based browser.",
+			win)
+		return
+	}
+
+	// If only one browser found, use it directly and save as default.
+	if len(browsers) == 1 {
+		prefs.SetString(prefKeyDefaultBrowser, browsers[0].Path)
+		if err := LaunchBrowser(fyneApp, browsers[0], proxyHost, proxyPort); err != nil {
+			dialog.ShowError(err, win)
+		}
+		return
+	}
+
+	// Multiple browsers — show picker.
+	showBrowserPickerDialog(fyneApp, win, browsers, proxyHost, proxyPort)
+}
+
+// showBrowserPickerDialog shows a one-time dialog to pick a default browser.
+func showBrowserPickerDialog(fyneApp fyne.App, win fyne.Window, browsers []DetectedBrowser, proxyHost string, proxyPort int) {
+	names := make([]string, len(browsers))
+	for i, b := range browsers {
+		names[i] = b.Name
+	}
+
+	selected := browsers[0]
+	picker := newBrowserPickerContent(names, func(name string) {
+		for _, b := range browsers {
+			if b.Name == name {
+				selected = b
+				break
+			}
+		}
+	})
+
+	d := dialog.NewCustomConfirm("Select Default Browser", "Launch", "Cancel", picker, func(confirmed bool) {
+		if !confirmed {
+			return
+		}
+		fyneApp.Preferences().SetString(prefKeyDefaultBrowser, selected.Path)
+		if err := LaunchBrowser(fyneApp, selected, proxyHost, proxyPort); err != nil {
+			dialog.ShowError(err, win)
+		}
+	}, win)
+	closeOnEscape(win, d.Dismiss)
+	d.Show()
+}