138 lines
4.4 KiB
Bash
Executable File
138 lines
4.4 KiB
Bash
Executable File
#!/bin/sh
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#―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――
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# Name: sfeed_mastodon
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# Desc: Post feed data from sfeed to the fediverse.
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# Reqs: curl, jq
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# Date: 2023-11-16
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# Lisc: GPLv3
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# Auth: @jadedctrl@jam.xwx.moe
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#―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――
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# Print a friendly usage message.
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usage() {
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echo "usage: $(basename $0) [-h] [-a FEDI_AUTH] SERVER_URL"
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echo "Posts sfeed(1) feed data from stdin to Mastodon-compatible servers."
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echo ""
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echo " -h print this message and exit"
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echo " -a the authorization token for your account; see below"
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echo " -t template for post contents; see below"
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echo ""
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echo "To find your authorization token, you can snoop through request headers in"
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echo "your web-browser. In Firefox, this can be done through:"
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echo ' Developer Tools (F12) → Network → Headers'
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echo 'Look for your $FEDI_AUTH value in the Authorization header like so:'
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echo ' Authorization: Bearer $FEDI_AUTH'
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echo 'Either place this value in your $FEDI_AUTH environment variable, or pass it'
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echo "with -a."
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echo ""
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echo "The template (-t) is an HTML value for this script’s post format."
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echo "Post-related variables go within {{double-braces}}, and the following"
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echo "variables are recognized: title, url, desc, desc_short, unix_date."
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echo "By default, the template used is:"
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echo " <b>{{title}}</b><br>{{url}}<br><br><blockquote>{{desc_short}}</blockquote>"
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}
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# Deescape a URL-escaped string (percent-encoded), passed over stdin.
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url_deescape() {
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sed 's@+@ @g;s@%@\\x@g' \
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| xargs -0 printf "%b"
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}
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# Takes a post’s contents and create the corresponding client-API JSON.
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post_json() {
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local message_text="$1"
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printf '{ "content_type": "text/html", "visibility": "unlisted",'
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printf '"status": "%s" }\n' "$message_text"
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}
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# Post a status with HTML content to the given Mastodon-compatible server.
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post_status() {
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local server="$1"
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local auth_token="$2"
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local message_text="$3"
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curl --request POST \
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--header "Authorization: Bearer $auth_token" \
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--header "Content-Type: application/json" \
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--data "$(post_json "$message_text" | tr -d '\n')" \
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"${server}/api/v1/statuses"
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}
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# Print an sfeed post line as per $TEMPLATE, with the following variables:
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# {{title}}, {{unix_date}}, {{url}}, {{desc}}, {{desc_short}}
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sfeed_post_text() {
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local sfeed_line="$1"
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local unix_date="$(echo "$line" | awk --field-separator '\t' '{print $1}')"
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local title="$(echo "$line" | awk --field-separator '\t' '{print $2}')"
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local url="$(echo "$line" | awk --field-separator '\t' '{print $3}' | url_deescape)"
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local desc="$(echo "$line" | awk --field-separator '\t' '{print $4}' | tr -d '\n')"
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local desc_snip="$(echo "$desc" | head -c250)[…]"
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printf "$TEMPLATE" \
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| tr -d '|' \
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| sed "s|{{title}}|$title|g" \
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| sed "s|{{unix_date}}|$unix_date|g" \
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| sed "s|{{url}}|$url|g" \
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| sed "s|{{desc}}|$desc|g" \
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| sed "s|{{desc_short}}|$desc_snip|g"
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}
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# Post an sfeed feed entry, by line, to a Mastodon-compatible fedi server.
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post_sfeed_line() {
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local server="$1"
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local auth="$2"
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local line="$3"
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local message_text="$(sfeed_post_text "$line")"
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post_status "$server" "$auth" "$message_text"
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}
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TEMPLATE='<b>{{title}}</b><br>{{url}}<br><br><blockquote>{{desc_short}}</blockquote>'
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while getopts 'ha:t:' arg; do
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case $arg in
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h)
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usage
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exit 0
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;;
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a)
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FEDI_AUTH="$OPTARG"
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;;
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t)
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TEMPLATE="$OPTARG"
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;;
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esac
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done
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shift $((OPTIND-1))
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SERVER_URL="$1"
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if test -z "$FEDI_AUTH"; then
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1>&2 echo 'You need to set the environment variable $FEDI_AUTH!'
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1>&2 echo 'You can find your auth key by examining the "Authentication: Bearer" header'
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1>&2 echo "used in requests by your server's web-client."
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1>&2 echo 'In Firefox, F12→Network.'
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1>&2 echo ""
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exit 2
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fi
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if test -z "$SERVER_URL"; then
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1>&2 echo "No server specified!"
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1>&2 echo "Make sure to provide a server base URL (like https://fedi.server) as the last argument."
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1>&2 echo ""
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1>&2 usage
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exit 3
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fi
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IFS="
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"
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while read line; do
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post_sfeed_line "$SERVER_URL" "$FEDI_AUTH" "$line"
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done
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