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|
#! /bin/bash
# Save incoming mail as comment
# Usage:
# Step1. Add script into forward(5) for MDA
#
# echo '|"<PATH_TO_THIS_SCRIPT> --output_dir <PATH_OF_HTML_FILES>"' >>~/.forward
#
# Step2. Insert related html file into target page, the following example use <object> element
# * Please replace <PATH> for your target page, relative to value of --output_dir
# * Set <RECIPIENT> for mail address which can achive MDA
# * Change <PATH> in data attribute of <object> based on routing if necessary
#
# <!-- START OF COMMENT BLOCK -->
# <div style="border-radius: 6px; background: lightyellow">
# <a style="display: inline-block; margin: 0.5em 0.5em 0 0; float: right" href="mailto:<RECIPIENT>?subject=Comment on page: <PATH>">[Comment on this page]</a>
# <object type="text/html" data="<PATH>.comment.html" onload="observeResize(this)" style="width: 100%;"></object>
# <script>
# function observeResize(commentBlock) {
# new ResizeObserver((entries) => {
# commentBlock.style.height = entries[0].target.clientHeight + 'px';
# }).observe(commentBlock.contentDocument.documentElement);
# }
# </script>
# </div>
# <!-- END OF COMMENT BLOCK -->
# 0. Work as CGI {{{
# Print this script as HTTP Response
if [ -n "$REQUEST_METHOD" ]; then
<<-RESPONSE cat
Status: 200
Content-Type: text/plain
$(cat $0)
RESPONSE
exit 0
fi
# }}}
# 1. Check mail is for comment {{{
# Restore mail into variables
MAIL="$(tr -d '\r')"
# join multi-line field value into one line
header="$(<<<"$MAIL" sed '/^$/ q; :a; N; s/\n\s\+//; ta')"
body="$(<<<"$MAIL" sed -n '/^$/,$ p' | sed '1d')"
# determine mail is for comment by pattern
pattern='^Subject: .*[cC]omment on page:? +(https?://[^/]+)?(/?[^ ]+).*$'
<<<"$header" grep -E "$pattern" >/dev/null || exit 0
# }}}
# 2. Get necessary variables from arguments {{{
while [[ "$1" =~ ^-- && ! "$1" == "--" ]]; do
case $1 in
--output_dir ) shift; output_dir=$1 ;;
--markdown_bin ) shift; markdown_bin=$1 ;;
*) shift ;;
esac
shift
done
export PATH=/bin:/usr/bin:/usr/local/bin:~/.local/bin
output_dir=${output_dir:-$(dirname $0)}
markdown_bin=${markdown_bin:-$(which markdown 2>/dev/null)}
[ -x "$markdown_bin" ] || markdown_bin=cat
# }}}
# 3. Read header fields {{{
# enable execute last command in pipe under current shell
shopt -s lastpipe; set +m;
# save each field of header into variables
echo "$header" | \
while IFS=: read field value; do
field="${field^^}"
field="${field//-/_}"
export declare $field="${value}"
done
DATE=${DATE:+$(date --rfc-3339 seconds --date "$DATE")}
# }}}
# 4. Get path of output file {{{
path=$(<<<"$header" sed -En "\\|${pattern}| {s//\\2/p; q}")
# sender want comment on some page, but find no path for this
if [ $path = "" ]; then
echo 'Cannot get target of comment from mail' >&2
exit 1
fi
# get output path
[[ "$path" =~ /$ ]] && path+=index
path=${path#/}
path=${path/.html}
output=$output_dir/${path}.comment.html
umask 022; mkdir -p $(dirname $output)
# }}}
# 5. Get comment from mail body {{{
printTextPart() {
boundary=$1
beginPat="\\|^--${boundary}\$|"
endPat="\\|^--${boundary}(--)?\$|"
sed -En "${beginPat},${endPat} { \@^Content-Type: text/plain@,$ {1,/^$/d; ${beginPat}d; p} }"
}
# check mail includes multiple part
boundary="$(<<<"$CONTENT_TYPE" sed -En 's/^.*boundary="?([^"]+)"?.*$/\1/p')"
if [ -n "${boundary}" ]; then
# print mail part in MIME: text/plain
body="$(<<<"$body" printTextPart ${boundary})"
fi
# }}}
# 6. Write comment to output file {{{
# set STDOUT to $output, with readable permission for everyone
umask 133
# add basic html layout for output file if necessary {{{
if [ ! -f $output ] || ! xmllint --html --nofixup-base-uris $output &>/dev/null; then
<<-LAYOUT cat >$output
<style>
ul {
padding-inline: 1rem;
li {
margin-block: 1rem;
}
}
.comment-body {
margin-top: 0.5rem;
padding: 0.5rem;
overflow-x: scroll;
border-radius: 4px;
background: lightblue;
p {
margin: 0.5rem;
}
}
.replies {
display: none;
&:has(li) {
display: block;
}
summary {
cursor: pointer;
}
ul {
padding-inline: 1rem 0;
}
}
</style>
<ul>
</ul>
LAYOUT
fi
# }}}
# get line of insert position by header field "In-Reply-To" {{{
if [ -n "${IN_REPLY_TO}" ]; then
line=$(grep -n "^<!-- ${IN_REPLY_TO} -->$" $output | cut -d':' -f1)
fi
# }}}
# insert comment into output file {{{
# FIXME prevent pattern <!-- ${MESSAGE_ID} --> shown in <pre> block
<<-COMMENT sed -i "${line:-/<ul>/}r /dev/stdin" $output
<li>
<time datetime="${DATE}">${DATE}</time>
<a href="mailto:${RECIPIENT}?subject=Comment on page: ${path}&in-reply-to=${MESSAGE_ID}">[reply]</a>
<div class='comment-body'>
$(<<<"${body}" ${markdown_bin})
</div>
<details class="replies" open="true">
<summary>replies</summary>
<ul>
<!-- ${MESSAGE_ID} -->
</ul>
</details>
</li>
COMMENT
# }}}
# }}}
# vim:fdm=marker fdl=0
|
