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61 lines
1.9 KiB
Bash
Executable File
61 lines
1.9 KiB
Bash
Executable File
#!/bin/sh
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# gravatar2card.sh
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# Copyright (C) 2015-2025 Jan-Piet Mens <jpmens@gmail.com>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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# Usage: gravatar2card email "full name" tid
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#
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# Calculate email hash and obtain a 40x40 PNG from Gravatar
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# and convert image to BASE64. Create a JSON payload to be published
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# retained to owntracks/username/device/info
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#
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# You probably want to do this:
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#
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# gravatar2card.sh email-address "Jane Jolie" JJ > card.json
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# mosquitto_pub -t owntracks/jane/phone/info -r -f card.json
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#
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# Note: the two commands cannot be piplelined (mosquitto_pub -l)
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# because of a bug in mosquitto_pub: https://bugs.eclipse.org/bugs/show_bug.cgi?id=478917
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# If you have a newer version it should work fine.
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[ $# -ne 3 ] && { echo "Usage: $0 email full-name tid" >&2; exit 2; }
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hasher="shasum -a 256"
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if [ -x /usr/bin/md5sum ]; then
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md5=/usr/bin/md5sum
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fi
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email="$1"
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fullname="$2"
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tid="$3"
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tmp=$(mktemp /tmp/gravatar.XXXXXX)
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hash=$(printf "${email}" | tr '[:upper:]' '[:lower:]' | $hasher | cut -d' ' -f1)
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url="https://www.gravatar.com/avatar/${hash}?s=40"
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curl -s -o $tmp "${url}"
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imgdata=$(base64 -i $tmp)
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rm -f $tmp
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cat <<EndOfFile
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{"_type":"card","tid":"${tid}","name":"${fullname}","face":"${imgdata}"}
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EndOfFile
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