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50 lines
1.7 KiB
Bash
Executable File
50 lines
1.7 KiB
Bash
Executable File
#!/bin/sh
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# image2card.sh
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# Copyright (C) 2015-2016 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: image2card imagefile "full name"
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#
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# Requires `convert' from ImageMagick.
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# Read image, convert to PNG, forcing a 40x40 size and encode
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# to BASE64. Create a JSON payload to be published to
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# 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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# image2card.sh filename.jpg "Jane Jolie" > card.json
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# mosquitto_pub -t owntracks/jane/phone/info -f card.json -r
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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 newish version it should work fine.
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[ $# -ne 2 ] && { echo "Usage: $0 image-file full-name" >&2; exit 2; }
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imagefile="$1"
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fullname="$2"
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base64switch=""
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base64check=$(echo "jj" | base64 -w 0 > /dev/null 2>&1)
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[ "$?" -eq "0" ] && base64switch="-w 0"
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imgdata=$(convert "${imagefile}" -resize '40x40!' - | base64 $base64switch)
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cat <<EndOfFile
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{"_type":"card","name":"${fullname}","face":"${imgdata}"}
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EndOfFile
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