feat: add pre-configured librewolf browser

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

docs/proxy.md

@@ -1,6 +1,12 @@
 ## Configuring your browser's proxy settings
 
-We recommend installing **FoxyProxy** to manage your browser's proxies.
+**If you use Nix**, you can launch a pre-configured browser (LibreWolf) with the proxy and certificate already set up:
+
+```sh
+nix run github:anotherhadi/spilltea#browser{{if or (ne .Cfg.App.Host "127.0.0.1") (ne .Cfg.App.Port 8080) (ne .Cfg.App.CertDir "~/.local/share/spilltea")}} --{{end}}{{if ne .Cfg.App.Host "127.0.0.1"}} --host {{.Cfg.App.Host}}{{end}}{{if ne .Cfg.App.Port 8080}} --port {{.Cfg.App.Port}}{{end}}{{if ne .Cfg.App.CertDir "~/.local/share/spilltea"}} --cert-dir {{.Cfg.App.CertDir}}{{end}}
+```
+
+Otherwise, we recommend installing **FoxyProxy** to manage your browser's proxies.
 You can install it from the [Google Chrome extension store](https://chromewebstore.google.com/) or from the [Firefox extension store](https://addons.mozilla.org/en-US/firefox/extensions)
 
 1. Open FoxyProxy's options, then click on `Add New Proxy` button.

nix/browser.nix

@@ -0,0 +1,61 @@
+{pkgs}: let
+  defaultCertDir = "$HOME/.local/share/spilltea";
+  defaultHost = "127.0.0.1";
+  defaultPort = "8080";
+in
+  pkgs.writeShellApplication {
+    name = "spilltea-browser";
+    runtimeInputs = with pkgs; [nss.tools librewolf netcat-gnu procps];
+    text = ''
+      CERT_DIR="${defaultCertDir}"
+      HOST="${defaultHost}"
+      PORT="${defaultPort}"
+
+      while [[ $# -gt 0 ]]; do
+        case "$1" in
+          --cert-dir) CERT_DIR="$2"; shift 2 ;;
+          --host)     HOST="$2";     shift 2 ;;
+          --port)     PORT="$2";     shift 2 ;;
+          *) echo "Unknown argument: $1"; exit 1 ;;
+        esac
+      done
+
+      CERT_FILE="$CERT_DIR/mitmproxy-ca-cert.pem"
+
+      if [[ ! -f "$CERT_FILE" ]]; then
+        echo "Certificate not found at $CERT_FILE"
+        echo "Launch spilltea first, or use --cert-dir if you changed cert_dir in your config."
+        exit 1
+      fi
+
+      if ! pgrep -x spilltea > /dev/null 2>&1; then
+        echo "spilltea is not running. Launch spilltea first."
+        exit 1
+      fi
+
+      if ! nc -z "$HOST" "$PORT" > /dev/null 2>&1; then
+        echo "Nothing is listening on $HOST:$PORT."
+        echo "Is spilltea configured on that port? Use --host and --port if you changed them in your config."
+        exit 1
+      fi
+
+      PROFILE=$(mktemp -d)
+      trap 'rm -rf "$PROFILE"' EXIT
+
+      certutil -N -d sql:"$PROFILE" --empty-password
+      certutil -d sql:"$PROFILE" -A -n "spilltea" -t "CT,," -i "$CERT_FILE"
+
+      cat > "$PROFILE/user.js" <<EOF
+      user_pref("network.proxy.type", 1);
+      user_pref("network.proxy.http", "$HOST");
+      user_pref("network.proxy.http_port", $PORT);
+      user_pref("network.proxy.ssl", "$HOST");
+      user_pref("network.proxy.ssl_port", $PORT);
+      user_pref("network.proxy.no_proxies_on", "");
+      user_pref("network.stricttransportsecurity.preloadlist", false);
+      user_pref("dom.security.https_only_mode", false);
+      EOF
+
+      librewolf --profile "$PROFILE" --no-remote
+    '';
+  }

nix/package.nix

@@ -2,6 +2,7 @@
   pkgs,
   buildGoApplication,
 }: let
+  browser = import ./browser.nix {inherit pkgs;};
   pname = "spilltea";
   version = "0.0.6";
   ldflags = ["-s" "-w" "-X main.version=${version}"];
@@ -9,7 +10,7 @@
     inherit pname version ldflags;
     src = ../.;
     modules = ./gomod2nix.toml;
-    nativeBuildInputs = [ pkgs.installShellFiles ];
+    nativeBuildInputs = [pkgs.installShellFiles];
     env.GOTOOLCHAIN = "local";
     postInstall = ''
       installShellCompletion --cmd spilltea \
@@ -26,4 +27,5 @@
 in {
   "${pname}" = pkg;
   default = pkg;
+  browser = browser;
 }