#!/usr/bin/env bash
# @file GPG Configuration
# @brief Imports the public GPG key defined by the variable `KEYID` and then assigns it ultimate trust
# @description
#     This script imports your publicly hosted GPG key using `pgp.mit.edu` as the key host. It then assigns it
#     the ultimate trust level. It also downloads and configures GPG to use the configuration defined in `.config.gpg`
#     in the `home/.chezmoidata.yaml` file.

{{ includeTemplate "universal/profile-before" }}
{{ includeTemplate "universal/logg-before" }}

export KEYID="{{ .user.gpg.id }}"

if [ -n "$KEYID" ] && command -v gpg > /dev/null; then
  if [ ! -d "$HOME/.gnupg" ]; then
    mkdir "$HOME/.gnupg"
  fi
  chown "$(whoami)" "$HOME/.gnupg"
  chmod 700 "$HOME/.gnupg"
  chown -Rf "$(whoami)" "$HOME/.gnupg/"
  find "$HOME/.gnupg" -type f -exec chmod 600 {} \;
  find "$HOME/.gnupg" -type d -exec chmod 700 {} \;
  if [ -f "${XDG_DATA_HOME:-$HOME/.local/share}/chezmoi/home/private_dot_gnupg/public/${KEYID}.asc" ]; then
    logg info "Importing GPG key stored in ${XDG_DATA_HOME:-$HOME/.local/share}/chezmoi/home/private_dot_gnupg/public/${KEYID}.asc since its name matches the GPG key ID in .chezmoi.yaml.tmpl"
    gpg --import "${XDG_DATA_HOME:-$HOME/.local/share}/chezmoi/home/private_dot_gnupg/public/${KEYID}.asc" && logg success 'Successfully imported master GPG key'
  fi
  if [ ! -f "$HOME/.gnupg/gpg.conf" ]; then
    logg 'Downloading hardened gpg.conf file to ~/.gpnupg/gpg.conf'
    curl -sSL "{{ .config.gpg }}" > "$HOME/.gnupg/gpg.conf"
    chmod 600 "$HOME/.gnupg/gpg.conf"
  fi
  KEYID_TRIMMED="$(echo "$KEYID" | sed 's/^0x//')"
  if ! gpg --list-secret-keys --keyid-format=long | grep "$KEYID_TRIMMED" > /dev/null; then
    logg info 'Killing dirmngr instance and reloading daemon with standard-resolver'
    sudo pkill dirmngr
    dirmngr --daemon --standard-resolver
    if [ -f "$HOME/.gnupg/public/$KEYID.sig" ]; then
      gpg --import "$HOME/.gnupg/public/$KEYID.sig"
    else
      logg info 'Attempting to download the specified public GPG key ({{ .user.gpg.id }}) from public keyservers'
      gpg --keyserver https://pgp.mit.edu --recv "$KEYID" || EXIT_CODE=$?
      if [ -n "$EXIT_CODE" ]; then
        logg info 'Non-zero exit code received when downloading public GPG key'
        gpg --keyserver hkps://pgp.mit.edu --recv "$KEYID" || EXIT_CODE=$?
        if [ -n "$EXIT_CODE" ]; then
          logg info 'Non-zero exit code received when trying to retrieve public user GPG key on hkps://pgp.mit.edu'
        else
          logg success 'Successfully imported configured public user GPG key'
        fi
      fi
    fi
    logg info 'Stopping dirmngr'
    gpgconf --kill dirmngr && logg info 'Stopped dirmngr' || info warn 'Failed to stop dirmngr'
  else
    logg info 'Key is already in keyring'
  fi
  logg 'Ensuring the trust of the provided public GPG key is set to maximum'
  echo -e "trust\n5\ny" | gpg --command-fd 0 --edit-key "$KEYID"
else
  logg warn 'gpg appears to be unavailable. Is it installed and on the PATH?'
fi