initial commit

main.go

@@ -0,0 +1,65 @@
+// Command open-proxy forwards `open`/`xdg-open` requests from a remote VM to
+// the host machine that actually has the browser/GUI.
+//
+// On the host:   open-proxy serve
+// On the VM:     open-proxy open <file|url|string>...
+//
+// The VM reaches the host's server over an SSH reverse tunnel, e.g.
+//
+//	ssh -R 7777:127.0.0.1:7777 vm
+//
+// so the VM's 127.0.0.1:7777 maps to the host's server.
+//
+// As a convenience, when the binary is invoked under the name "open" (e.g. via
+// a symlink early on $PATH), it behaves exactly like `open-proxy open`.
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+func main() {
+	// Shadowed-name mode: when symlinked to `open` or `xdg-open`, act as the
+	// client and fall back to that same real opener if the host is unreachable.
+	if base := filepath.Base(os.Args[0]); base == "open" || base == "xdg-open" {
+		os.Exit(runClient(os.Args[1:], base))
+	}
+
+	if len(os.Args) < 2 {
+		usage()
+		os.Exit(2)
+	}
+
+	switch os.Args[1] {
+	case "serve":
+		os.Exit(runServer(os.Args[2:]))
+	case "open":
+		os.Exit(runClient(os.Args[2:], defaultOpenerName()))
+	case "-h", "--help", "help":
+		usage()
+		os.Exit(0)
+	default:
+		fmt.Fprintf(os.Stderr, "open-proxy: unknown command %q\n\n", os.Args[1])
+		usage()
+		os.Exit(2)
+	}
+}
+
+func usage() {
+	fmt.Fprint(os.Stderr, `open-proxy - forward `+"`open`"+` from a remote VM to the host
+
+Usage:
+  open-proxy serve [-addr 127.0.0.1:7777]
+  open-proxy open  <file|url|string>...
+
+Environment:
+  OPEN_PROXY_ADDR    client target / server listen address (default 127.0.0.1:7777)
+  OPEN_PROXY_TOKEN   shared secret; if set on the server, clients must match
+  OPEN_PROXY_MAXSIZE max file transfer size in bytes (default 104857600)
+
+Tip: symlink the binary to "open" and/or "xdg-open" early on the VM's $PATH.
+     When the host is unreachable, it falls back to the real opener on $PATH.
+`)
+}