#!/usr/bin/env sh

# This script is derived from `install.sh` in Danny van Kooten's "browserpass":
# https://github.com/dannyvankooten/browserpass

set -e

APP_NAME="passff"
VERSION="_VERSIONHOLDER_"
HOST_URL="https://github.com/passff/passff-host/releases/download/$VERSION/passff.py"
MANIFEST_URL="https://github.com/passff/passff-host/releases/download/$VERSION/passff.json"
KERNEL_NAME=$(uname -s)

# Find target dirs for various browsers & OS'es
# https://developer.chrome.com/extensions/nativeMessaging#native-messaging-host-location
# https://wiki.mozilla.org/WebExtensions/Native_Messaging
if [ "$KERNEL_NAME" = 'Darwin' ]; then
  if [ "$(whoami)" = "root" ]; then
    TARGET_DIR_CHROME="/Library/Google/Chrome/NativeMessagingHosts"
    TARGET_DIR_CHROMIUM="/Library/Application Support/Chromium/NativeMessagingHosts"
    TARGET_DIR_FIREFOX="/Library/Application Support/Mozilla/NativeMessagingHosts"
    TARGET_DIR_VIVALDI="/Library/Application Support/Vivaldi/NativeMessagingHosts"
    TARGET_DIR_LIBREWOLF="/Library/Application Support/LibreWolf/NativeMessagingHosts"
  else
    TARGET_DIR_CHROME="$HOME/Library/Application Support/Google/Chrome/NativeMessagingHosts"
    TARGET_DIR_CHROMIUM="$HOME/Library/Application Support/Chromium/NativeMessagingHosts"
    TARGET_DIR_FIREFOX="$HOME/Library/Application Support/Mozilla/NativeMessagingHosts"
    TARGET_DIR_VIVALDI="$HOME/Library/Application Support/Vivaldi/NativeMessagingHosts"
    TARGET_DIR_LIBREWOLF="$HOME/Library/Application Support/LibreWolf/NativeMessagingHosts"
  fi
else
  if [ "$(whoami)" = "root" ]; then
    TARGET_DIR_CHROME="/etc/opt/chrome/native-messaging-hosts"
    TARGET_DIR_CHROMIUM="/etc/chromium/native-messaging-hosts"
    TARGET_DIR_FIREFOX="/usr/lib/mozilla/native-messaging-hosts"
    TARGET_DIR_VIVALDI="/etc/vivaldi/native-messaging-hosts"
    TARGET_DIR_LIBREWOLF="/usr/lib/librewolf/native-messaging-hosts"
  else
    TARGET_DIR_CHROME="$HOME/.config/google-chrome/NativeMessagingHosts"
    TARGET_DIR_CHROMIUM="$HOME/.config/chromium/NativeMessagingHosts"
    TARGET_DIR_FIREFOX="$HOME/.mozilla/native-messaging-hosts"
    TARGET_DIR_VIVALDI="$HOME/.config/vivaldi/NativeMessagingHosts"
    TARGET_DIR_LIBREWOLF="$HOME/.librewolf/native-messaging-hosts"
  fi
fi

usage() {
  echo "Usage: $0 [OPTION] [chrome|chromium|firefox|opera|vivaldi|librewolf]

  Example:
    $0 firefox   # Install host app for Mozilla Firefox

  Options:
    -l, --local    Install files from disk instead of downloading them
    -h, --help     Show this message"
}

while [ $# -gt 0 ]; do
  case $1 in
    chrome)
      BROWSER_NAME="Chrome"
      TARGET_DIR="$TARGET_DIR_CHROME"
      ;;
    chromium)
      BROWSER_NAME="Chromium"
      TARGET_DIR="$TARGET_DIR_CHROMIUM"
      ;;
    firefox)
      BROWSER_NAME="Firefox"
      TARGET_DIR="$TARGET_DIR_FIREFOX"
      ;;
    librewolf)
      BROWSER_NAME="Librewolf"
      TARGET_DIR="$TARGET_DIR_LIBREWOLF"
      ;;
    opera)
      BROWSER_NAME="Opera"
      TARGET_DIR="$TARGET_DIR_VIVALDI"
      ;;
    vivaldi)
      BROWSER_NAME="Vivaldi"
      TARGET_DIR="$TARGET_DIR_VIVALDI"
      ;;
    -l|--local)
      USE_LOCAL_FILES=true
      ;;
    -h|--help)
      usage
      exit 0
      ;;
    *)
      usage
      exit 1
      ;;
  esac
  shift
done

PYTHON3_PATH="$(which python3)"
if [ -x "$PYTHON3_PATH" ]; then
  echo "Python 3 executable located at $PYTHON3_PATH"
else
  echo "Python 3 executable not found, but Python 3 is required for PassFF to work!"
  exit 1
fi

PASS_PATH="$(which pass || which gopass)"
if [ -x "$PASS_PATH" ]; then
  echo "Pass executable located at $PASS_PATH"
else
  echo "Pass executable not found, but Pass is required for PassFF to work!"
  exit 1
fi

if [ -z "$TARGET_DIR" ]; then
  usage
  exit 1
fi

HOST_FILE_PATH="$TARGET_DIR/$APP_NAME.py"
MANIFEST_FILE_PATH="$TARGET_DIR/$APP_NAME.json"

echo "Installing $BROWSER_NAME host config"

# Create config dir if not existing
mkdir -p "$TARGET_DIR"

PATH_ESC="$(echo "$PATH" | sed -e 's/@/\\@/g')"
PASS_PATH_ESC="$(echo "$PASS_PATH" | sed -e 's/@/\\@/g')"
HOST_FILE_PATH_ESC="$(echo "$HOST_FILE_PATH" | sed -e 's/@/\\@/g')"
PYTHON3_PATH_ESC="$(echo "$PYTHON3_PATH" | sed -e 's/@/\\@/g')"

# Replace path to python3 executable \
# Replace path to pass (only in a line starting with "COMMAND =") \
# Set the PATH to match this script's \
HOST_SED=" \
1 s@.*@#!${PYTHON3_PATH_ESC}@; \
/^COMMAND *=/s@\"pass\"@\"$PASS_PATH_ESC\"@; \
s@\"PATH\":.*@\"PATH\": \"$PATH_ESC\"@; \
"
# Replace path to host \
MANIFEST_SED=" \
s@PLACEHOLDER@$HOST_FILE_PATH_ESC@; \
"

if [ "$USE_LOCAL_FILES" = true ]; then
  sed -e "${HOST_SED}"     "$(dirname "$0")/passff.py"   >  "$HOST_FILE_PATH"
  sed -e "${MANIFEST_SED}" "$(dirname "$0")/passff.json" >  "$MANIFEST_FILE_PATH"
else
  # Download native host script and manifest
  curl -sSL "$HOST_URL"     | sed -e "${HOST_SED}"     > "$HOST_FILE_PATH"
  curl -sSL "$MANIFEST_URL" | sed -e "${MANIFEST_SED}" > "$MANIFEST_FILE_PATH"
fi

# Set permissions for the manifest so that all users can read it.
chmod a+x "$HOST_FILE_PATH"
chmod o+r "$MANIFEST_FILE_PATH"

echo "Native messaging host for $BROWSER_NAME has been installed to $TARGET_DIR."