signal-to-inbox

#! /bin/sh

. $HOME/scripts/personal/signal_number.sh

INBOX=$HOME/org/0_inbox
XDG_DATA_HOME=${XDG_DATA_HOME:-$HOME/.local/share}
CACHE_DIR=$XDG_DATA_HOME/signal-cli
ERROR_LOG=$CACHE_DIR/error.log
ATTACHMENT_DIR="$CACHE_DIR/attachments"
NUMBERS_WHITELIST=$HOME/scripts/personal/signal-numbers-whitelist

if [ "$1" = "--help" ] || [ "$1" = "-h" ] || [ "$1" = "help" ]; then
  cat <<EOF
$ signal-to-inbox
Receive signal messages and sort them into the inbox

Prerequisite is to register the number with signal
EOF
  exit
fi

command -v signal-cli >/dev/null || { echo "signal-cli is not installed" 1>&2; exit 127; }

CACHE_FILE="$CACHE_DIR/received-messages-$(date +%s)"

is_whitelisted() {
  local number="$1"
  if grep "$number" $NUMBERS_WHITELIST >/dev/null; then
    true
  else
    false
  fi
}

receive() {
  signal-cli -a $SIGNAL_NUMBER receive --ignore-stories --send-read-receipts >$CACHE_FILE 2>/tmp/signal-cli-errors ||
    echo "Receiving signal messages failed!\nRun the script manually or consult /tmp/signal-cli-errors" >$INBOX/signal-cli-errors
}
parseMessages() {
  if [ -z "$(cat $CACHE_FILE)" ]; then
    rm $CACHE_FILE
  else
    N=0
    BODY=""
    ATTACHMENT=""
    ignore_message=0
    attachment_count=1
    is_multiline=0
    multiline_body_done=0
    while read line; do
      if [ -n "$BODY" ] && [ "$multiline_body_done" -eq 0 ]; then
        if echo $line | grep -ve "^Expires in:" >/dev/null; then
          BODY="${BODY}\n$line"
          is_multiline=1
        else
          multiline_body_done=1
        fi
      fi

      has_envelope=`echo $line | grep -Po "^Envelope from: .+?\K\+\d+"`
      if [ -n "$has_envelope" ] && ! is_whitelisted "$has_envelope"; then
        ignore_message=1
      fi

      has_body=`echo $line | grep -Po "^Body: \K.+"`
      if [ -n "$has_body" ]; then
        BODY="$has_body"
      fi

      has_filename=`echo $line | grep -Po "Filename: \K.+"`
      if [ -n "$ATTACHMENT" ] && [ -n "$has_filename" ] && [ "$ignore_message" -eq 0 ]; then
          cp "$ATTACHMENT_DIR/$ATTACHMENT" "$INBOX/$has_filename"
          ATTACHMENT=""
          attachment_count=$((${attachment_count}+1))
      fi

      has_attachement=`echo $line | grep -Po "Id: \K.+"`
      if [ -n "$has_attachement" ] && [ "$ignore_message" -eq 0 ]; then
        if [ -n "$ATTACHMENT" ]; then
          if [ -n "$BODY" ]; then
            cp "$ATTACHMENT_DIR/$ATTACHMENT" "$INBOX/$BODY-$attachment_count.${ATTACHMENT##*.}" 2>$ERROR_LOG
          else
            cp "$ATTACHMENT_DIR/$ATTACHMENT" $INBOX/ 2>$ERROR_LOG
          fi
          ATTACHMENT=""
        fi
        ATTACHMENT="$has_attachement"
      fi

      if [ -z "$line" ] && ([ "$is_multiline" -eq 0 ] || [ "$multiline_body_done" -eq 1 ]); then # reset
        if [ -n "$BODY" ] && [ -z "$ATTACHMENT" ] && [ "$ignore_message" -eq 0 ]; then
          body_shortend=`echo $BODY | tr "\n" " " | cut -c-50`
          filename=$body_shortend
          if echo $body_shortend | grep ":" >/dev/null; then
            filename=`echo $body_shortend | cut -d: -f1`
          fi

          # write text contents to file
          echo "$BODY" | grep -v "generated by https://otter.ai" >"$INBOX/${filename}.norg"
        fi

        if [ -n "$ATTACHMENT" ] && [ "$ignore_message" -eq 0 ]; then
          if [ -n "$BODY" ]; then
            cp "$ATTACHMENT_DIR/$ATTACHMENT" "$INBOX/$BODY-$attachment_count.${ATTACHMENT##*.}" 2>$ERROR_LOG
          else
            cp "$ATTACHMENT_DIR/$ATTACHMENT" $INBOX/ 2>$ERROR_LOG
          fi
        fi

        N=$((${N}+1))
        BODY=""
        ATTACHMENT=""
        attachment_count=1
        multiline_body_done=0
        is_multiline=0
        ignore_message=0
      fi
    done <$CACHE_FILE
  fi
}

~/scripts/cron/waitforinternet
~/scripts/cron/cron-notify-send "Receiving notes from signal"
receive
parseMessages