create CARD from gravatar

contrib/faces/gravatar2card.sh

@@ -0,0 +1,37 @@
+#!/bin/sh
+# gravatar2card.sh (Feb 2017) by Jan-Piet Mens
+# Usage: gravatar2card email "full name"
+#
+# Calculate email hash and obtain a 40x40 PNG from Gravatar.
+# to BASE64. Create a JSON payload to be published to
+# owntracks/username/device/info
+#
+# You probably want to do this:
+#
+# gravatar2card.sh email-address  "Jane Jolie" > card.json
+# mosquitto_pub -t owntracks/jane/phone -f card.json
+#
+# Note: the two commands cannot be piplelined (mosquitto_pub -l)
+# because of a bug in mosquitto_pub: https://bugs.eclipse.org/bugs/show_bug.cgi?id=478917
+# If you have a newish version it should work fine.
+
+
+[ $# -ne 2 ] && { echo "Usage: $0 email full-name" >&2; exit 2; }
+
+email="$1"
+fullname="$2"
+tmp=$(mktemp /tmp/gravatar.XXXXXX)
+
+hash=$(echo -n "${email}" | tr '[:upper:]' '[:lower:]' | md5)
+url="http://www.gravatar.com/avatar/${hash}?s=40"
+
+
+curl -s -o $tmp "${url}"
+
+imgdata=$(base64 -i $tmp)
+rm -f $tmp
+
+cat <<EndOfFile
+{"_type":"card","name":"${fullname}","face":"${imgdata}"}
+EndOfFile
+