Save an email attachment automatically to map with qmail and reformime

Question

Save an email attachment automatically to map with qmail and reformime

I'm trying to move attachment automatically to another locatie with the dot-qmail file.

My .qmail file

#------------------------------------------------------------
| condredirect pdf-junkmail headermatch 'X-Spam-Status: Yes'
| reformime -X /bin/sh -c "if [ "\${FILENAME#*.}" == "pdf" ];  then cat > /home/users/name/home/$(date +%Y%m%d)_\$FILENAME; fi"
# Forward not set
# Vacation Message not set
./Maildir/

This works for a simple mail with one attachment. My questions:

1. How can I also move the mailmessage that belongs to this attachment to a mailbox named "done".
2. Above command doesn't work with multiple attachments in one mailmessage? How can I ajust this line to work for multiple attachments?
3. This doesn't work if the filename contains multiple dots like "how.areyou.pdf"

Thanks for the help

Answer 1

Here is a featured implementation for your problem.

First save and set permissions to this bash script for your user.
You will need to call it from your .qmail file:

extract-pdf-attachments.sh

#!/usr/bin/env bash

# This script process mail message attachments from stdin MIME message
# Extract all PDF files attachments
# and return the MIME message to stdout for further processing

# Ensure all locale settings are set to C, to prevent
# reformime from failing MIME headers decode with
# [unknown character set: ANSI_X3.4-1968]
# See: https://bugs.gentoo.org/304093
export LC_ALL=C LANG=C LANGUAGE=C

# Setting the destination path for saved attachments
attachements='/home/users/name/home'

trap 'rm -f -- "$mailmessage"' EXIT # Purge temporary mail message

# Create a temporary message file
mailmessage="$(mktemp)"

# Save stdin message to tempfile
cat > "$mailmessage"

# Iterate all MIME sections from the message
while read -r mime_section; do

  # Get all section info headers
  section_info="$(reformime -s "$mime_section" -i <"$mailmessage")"

  # Parse the Content-Type header
  content_type="$(grep 'content-type' <<<"$section_info" | cut -d ' ' -f 2-)"

  # Parse the Content-Name header (if available)
  content_name="$(grep 'content-name' <<<"$section_info" | cut -d ' ' -f 2-)"

  # Decode the value of the Content-Name header
  content_name="$(reformime -c UTF-8 -h "$content_name")"

  if [[ $content_type = "application/pdf" || $content_name =~ .*\.[pP][dD][fF] ]]; then
    # Attachment is a PDF
    if [ -z "$content_name" ]; then
      # The attachment has no name, so create a random name
      content_name="$(mktemp --dry-run unnamed_XXXXXXXX.pdf)"
    fi
    # Prepend the date to the attachment filename
    filename="$(date +%Y%m%d)_$content_name"

    # Save the attachment to a file
    reformime -s "$mime_section" -e <"$mailmessage" >"$attachements/$filename"
  fi

done < <(reformime < "$mailmessage") # reformime list all mime sections

cat <"$mailmessage" # Re-inject the message to stdout for further processing

Then in you .qmail:

#------------------------------------------------------------
| condredirect pdf-junkmail headermatch 'X-Spam-Status: Yes'
| bash /path/to/extract-pdf-attachments.sh | condredirect done true
# Forward not set
# Vacation Message not set
./Maildir/