email

#!/bin/bash

# DEPENDENCIES: pass, parse*, jq, txtin*, curl
#     where * are personal scripts: www.github.com/algorist-ahmad/scripts 
# PARAMETERS: -to, -sub, -msg

# SMTP server settings for Gmail
SMTP_SERVER="smtp.gmail.com"
SMTP_PORT="587"
SMTP_USERNAME="$EMAIL"
SMTP_PASSWORD=$(pass $EMAIL_PASSWORD)

HTML_FILE="$(parse $@ | jq -r '.args.parsed.html')" # plaintext is the default

# email content
TO="$(parse $@ | jq -r '.args.parsed.to')"
SUBJECT="$(parse $@ | jq -r '.args.parsed.sub')"
BODY="$(parse $@ | jq -r '.args.parsed.msg')"
FOOTNOTE="*********************************************************\nsent via curl by ~/bin/email on $(date)"

prompt_user() {
  TO=$EMAIL ; echo "TO: $EMAIL"
  SUBJECT=$(txtin -p 'SUBJECT: ')
  BODY=$(txtin -m -p 'COMPOSE MESSAGE, TERMINATE WITH EOF:\n')
}

send_as_plaintext() {
  [[ "$TO" =~ ^(null|true)$ ]] && >&2 echo 'ERROR: NO RECIPIENT (-to)' && exit 1
  [[ "$BODY" =~ ^(null|true)$ ]] && >&2 echo 'ERROR: EMPTY MESSAGE (-msg)' && exit 2
  [[ "$SUBJECT" =~ ^(''|null|true)$ ]] && >&2 echo 'WARNING: NO SUBJECT' && sleep 1 && SUBJECT=$(date)
  
  # Construct the email message
  MESSAGE="Subject: $SUBJECT\n\n$BODY\n\n\n\n\n\n$FOOTNOTE"
  
  # Send the email using Curl
  curl --show-error \
       --url "smtp://$SMTP_SERVER:$SMTP_PORT" \
       --ssl-reqd \
       --mail-from "$SMTP_USERNAME" \
       --mail-rcpt "$TO" \
       --user "$SMTP_USERNAME:$SMTP_PASSWORD" \
       --tlsv1.2 \
       -T <(echo -e "$MESSAGE")

  echo "Email sent to $TO"
}

send_as_multipart() {
  [[ "$TO" =~ ^(null|true)$ ]] && >&2 echo 'ERROR: NO RECIPIENT (-to)' && exit 1
  [[ "$BODY" =~ ^(null|true)$ ]] && >&2 echo 'ERROR: EMPTY MESSAGE (-msg)' && exit 2
  [[ "$SUBJECT" =~ ^(''|null|true)$ ]] && >&2 echo 'WARNING: NO SUBJECT' && sleep 1 && SUBJECT=$(date)
  
  # Construct the email message
  MESSAGE="Subject: $SUBJECT\n\n$BODY\n\n\n\n\n\n$FOOTNOTE"
  
  # Send the email using Curl, changed to --ssl from --ssl-reqd (what is that?)
  curl --show-error \
       --url "smtp://$SMTP_SERVER:$SMTP_PORT" \
       --ssl-reqd \
       --mail-from "$SMTP_USERNAME" \
       --mail-rcpt "$TO" \
       --user "$SMTP_USERNAME:$SMTP_PASSWORD" \
       --tlsv1.2 \
       --upload-file "$BODY"

  echo "Email sent to $TO"
}

[[ $# -eq 0 ]] && prompt_user || parse $@ | jq -c '.'

if [[ -n "$HTML_MODE" ]]; then
  echo "SPECIAL MODE: HTML"
  send_as_multipart
else
  send_as_plaintext
fi