geph4 4.2.1 (new formula)

Closes #72208.

Signed-off-by: Carlo Cabrera <30379873+carlocab@users.noreply.github.com>

Formula/geph4.rb

@@ -0,0 +1,22 @@
+class Geph4 < Formula
+  desc "Modular Internet censorship circumvention system to deal with national filtering"
+  homepage "https://geph.io/"
+  url "https://github.com/geph-official/geph4/archive/v4.2.1.tar.gz"
+  sha256 "bb5aaadb4fc55a22ec0be59761f9f5e71299e2c944c8b74432b45f278fb755c9"
+  license "GPL-3.0-only"
+
+  depends_on "rust" => :build
+
+  def install
+    File.delete("Cross.toml")
+    remove_dir(".cargo")
+    Dir.chdir "geph4-client"
+    system "cargo", "install", "--bin", "geph4-client", *std_cargo_args
+  end
+
+  test do
+    assert_equal "{\"error\":\"wrong password\"}",
+     shell_output("#{bin}/geph4-client sync --username 'test' --password 'test' --credential-cache ~/test.db")
+       .lines.last.strip
+  end
+end