[privacy] Add strip_image_metadata script

.gitignore

@@ -9,6 +9,7 @@
 .DS_Store
 .#*
 *.profraw
+*_original
 
 /vendor/*
 /target/*

contrib/privacy/strip_image_metadata.sh

@@ -0,0 +1,48 @@
+#!/usr/bin/env sh
+
+
+: ' 
+Requirements: `exiftool`
+
+This script makes use of exiftool to remove metadata from a file.
+Undesirable metadata might include author, operating system,
+version of image editor used to create an image, geolocation, etc.
+Often this information is present in files without our knowledge
+or assent so it is a good idea to proactively remove it using
+this script of exiftool directly.
+
+Exiftool works well for removing metadata from images. However,
+it cannot completely remove metadata from PDFs. See the exiftool
+docs for more information.
+
+This script should be run before a file is committed to
+the repository. 
+
+It can be run non-destructively as exiftool will create a copy 
+of the original file and preserve it with the string "_original" 
+appended to the end.
+e.g. `test.jpg` as input to exiftool will create `test.jpg_original`.
+
+This script is simple and removes metadata only from a single file.
+However, it is absolutely possible to use exitool in conjunction with
+`find` and a `for` loop to remove metadata, either using this tool
+or with exiftool directly.
+'
+
+set -e
+
+if [ "$#" -ne 1 ]; then
+	echo "Usage: $0 <file>"
+	exit 1
+fi
+
+
+FILE="$1"
+
+if ! [ -f $FILE ]; then
+	echo "Target should be a file"
+	exit 2
+else
+	exiftool -all= $FILE
+fi
+