feat(user/bkphotorights):Add script to save photo license metadata

- Note: Does so by using `exiftool`. Uses my information, my website,
  and CC BY-SA 4.0 as an example.

diff --git a/user/bkphotorights b/user/bkphotorights
new file mode 100644 (file)
index 0000000..a55ab8e
--- /dev/null
+++ b/user/bkphotorights
@@ -0,0 +1,61 @@
+#!/bin/bash
+# Desc: Apply metadata to photos
+# Usage: bkphotometa.sh [FILE in]
+# Ref/Attrib: [1]. Creative Commons XMP recommendation. (2015). https://wiki.creativecommons.org/wiki/XMP
+#             [2]. Eva, Johannes. (2023-03-30). “How to edit EXIF metadata via the command line with ExifTool”. libre-software.net. https://libre-software.net/linux/edit-metadata-exiftool/
+# Version: 0.0.1
+
+# Adjust me
+strCreator="Steven Baltakatei Sandoval";
+strCreatorURL="https://baltakatei.com";
+strTerms="This work is licensed to the public under the Creative Commons Attribution-ShareAlike license http://creativecommons.org/licenses/by-sa/4.0/ .";
+strLicenseURL="http://creativecommons.org/licenses/by-sa/4.0/";
+
+yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
+die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
+must() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
+main() {
+    declare -a cmd_args;
+    file_in="$1";
+
+    # Check plumbing
+    if [[ ! -f "$1" ]]; then die "FATAL:Not a file:$1"; fi;
+
+    # Check file
+    # Check if exiftool recognizes the file format
+    if ! exiftool -s -FileType "$file_in" 1>/dev/null; then
+        yell "ERROR:File type not recognized by exiftool:$file_in";
+    fi;
+    
+    # Change file metadata
+    unset cmd_args;
+    cmd_args+=("exiftool");
+    # cmd_args+=("-overwrite_original"); # hashtag reckless
+
+    value="$strTerms";
+    cmd_args+=("-XMP-dc:Rights=""$value"); unset value;
+
+    value="True";
+    cmd_args+=("-XMP-xmpRights:Marked=""$value"); unset value;
+
+    value="$strTerms";
+    cmd_args+=("-XMP-xmpRights:UsageTerms=""$value"); unset value;
+
+    value="$strLicenseURL";
+    cmd_args+=("-XMP-cc:license=""$value"); unset value;
+
+    value="$strCreator";
+    cmd_args+=("-XMP-cc:AttributionName=""$value"); unset value;
+
+    value="$strCreatorURL";
+    cmd_args+=("-XMP-cc:AttributionURL=""$value"); unset value;
+
+    cmd_args+=("$file_in");
+
+    # Execute command
+    "${cmd_args[@]}";
+}; # main program
+
+main "$@";
+
+