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:

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

Thanks for the help

Your quoting of the `-c shell commands` is wrong and your `==` comparison is not valid with POSIX `sh`. The filename extension extraction need two sharps `##` or it will not grab the longest match for `*` and will not work when multiple dots in filename. You need quotes when forming strings from a variable. Here is a fixed version: `| reformime -X /bin/sh -c 'if [ "${FILENAME##*.}" = "pdf" ]; then cat > "/home/users/name/home/$(date +%Y%m%d)_\$FILENAME"; fi' ` — Léa Gris, Oct 01 '19 at 13:00

score 2 · Accepted Answer · edited Dec 07 '19 at 04:31

2

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/

edited Dec 07 '19 at 04:31

Apojoost

127
10

answered Oct 01 '19 at 15:49

Léa Gris

17,497
4
32
41

All the attachements are named YYYYMMDD_unnamed_XXXXXXXX.pdf. If I try to comprehend the above code I would think that the names should be YYYYMMDD_named.pdf. What goes wrong? – Apojoost Oct 22 '19 at 20:27
I cannot move it to the mailbox named "done". The mailbox "done" is a maildir (mailbox format); so ./Maildir/.done/ – Apojoost Oct 22 '19 at 21:27
If the attachment file has no `content_name` in the MIME section, then apply the name `YYYYMMDD_unnamed_.pdf`, otherwise name it with `YYYYMMDD_content_name`. For the `done` mailbox, maybe I have no qmail at hand, use `.done` or full filesystem path, I am really not certain of the syntax to use here. – Léa Gris Oct 23 '19 at 00:48
I don't get your answer. If I sent a mail with the attachment "hello.pdf", I get an attachment with the name "20191023_unnamed_05ckYsc5.pdf" saved. If I read the script correctly you first assign the name "hello.pd" to the string content_name but in the next line you rewrite the string content_name by feeding it with a reformime command. Am I correct? Or maybe I don't understand you. I appreciate your help very much. – Apojoost Oct 23 '19 at 20:53
My bad, I derped on the empty name test. I fixed my answer. Replace `if [ -n "$content_name" ];` by `if [ -z "$content_name" ];` – Léa Gris Oct 24 '19 at 13:41
Now I'v got the following: "20191025_[unknown character set: ANSI_X3.4-1968]". You've got a solution? – Apojoost Oct 25 '19 at 07:35
`ANSI_X3.4-1968` is the international registry ID of `ASCII`, most likely the error comes from `reformime` who does not recognizes the `Content-Name:` header content. First try inserting `export LC_ALL=C LANG=C LANGUAGE=C` at start of script (after the shebang). If it does not help, you may have a bad `maildrop` version, see related mail-filter maildrop bug: https://bugs.gentoo.org/304093 – Léa Gris Oct 25 '19 at 09:40
Inserting `export LC_ALL=C LANG=C LANGUAGE=C` doesn't make a difference. `cat Maildir/cur/1572520822.22963.server:2, | reformime -s "$mime_section" -i ` gives a readable content-name, so I think it looks like reformime can read it? Or am I mistaken? (The maildrop version is 2.5.0.) Any more suggestions? – Apojoost Oct 31 '19 at 12:12
Try updating maildrop. Using version `maildrop 2.9.3` here. – Léa Gris Oct 31 '19 at 16:22
If I try the debug the script by adding: `# DEBUG
exec 5> debug.txt BASH_XTRACEFD="5" PS4='$LINENO: ' set -x` to the script. It seems like some thing goes wrong here: `# Decode the value of the Content-Name header content_name="$(reformime -h "$content_name")"` I don't understand this part. What are we doing here? – Apojoost Nov 30 '19 at 22:43
@Apojoost This parts processes the Content-Name header of the attachment's MIME section to get the name of the attached pdf file. – Léa Gris Dec 01 '19 at 01:38
If I leave out the line `content_name="$(reformime -h "$content_name")"` the script works. Is this line nescessary? Is there something wrong in this line? – Apojoost Dec 02 '19 at 22:35
1

Solved it by adding the '-c' option to refomime. Thus 'content_name="$(reformime -c UTF-8 -h "$content_name")"' source: https://sourceforge.net/p/courier/mailman/message/24972857/ – Apojoost Dec 06 '19 at 20:30
How can I change the subject of a message with a pdf within the script. Can I use something as: `sed 's/$^Subject:$.*/\1 [Afgehandeld]/' "$mailmessage"`? – Apojoost May 28 '20 at 22:30
1

2021 still working! on Ubuntu, I needed to install maildrop to have the command "reformime" – AwesomeUserName Sep 08 '21 at 03:32

Save an email attachment automatically to map with qmail and reformime

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