bash script to add users to ArchivesSpace repository permissions group

adduserstogroup.sh

# add users to group
#
# Usage: script $REPO_ID  $GROUP_CODE  [ list of user-names ]
#
ASHOST=${ASHOST:-localhost}
BASE="http://$ASHOST:8089"
USER=admin 
PWD=admin 
#
REPO=$1 ; shift;
GROUP=$1 ; shift; 
#
#
SESSION=$(curl -s -F password="$PWD" "$BASE/users/$USER/login" |   sed 's|.*"session":"\([a-z0-9]*\)".*|\1|g')
#
if [ -z "$REPO" ]
then
    echo 'Usage adduserstogroup $REPO_ID [$GROUP_CODE [ list of usernames ]]' 
    exit
fi
# get repository name & code:
THISREPO=( $(curl -H "X-ArchivesSpace-Session: $SESSION" -s $BASE/repositories/$REPO | jq '.uri, .repo_code,  .name' ))
echo ${THISREPO[*]}
#
if [ -z "$GROUP" ] # if no group 
then # display group codes for this repo
    echo "Groups for $THISREPO:"
    curl -H "X-ArchivesSpace-Session: $SESSION" -s $BASE/repositories/$REPO/groups | 
    jq 'reduce .[] as $x ( {}; . + { ($x.group_code): $x.description } )'
    exit
fi
# find the URI for that group_code
expr=".[] | select(.group_code == \"$GROUP\" ) | .uri"
GROUP_URI=$( curl -H "X-ArchivesSpace-Session: $SESSION" -s $BASE/repositories/$REPO/groups | jq  "$expr" | tr -d '"')
# capture and display JSON repr. of group to be updated
JSON=$( curl -H "X-ArchivesSpace-Session: $SESSION" -s ${BASE}$GROUP_URI )
echo $JSON | jq . 
if [ -n "$1" ] # if userlist
then 
#
ULIST=$( for U in $* ; do echo -n "\"$U\", " ; done )
echo "Add Users: [ ${ULIST:0:${#ULIST}-2} ] to group ${GROUP_URI}  [Y/N]? " 
read CONTINUE
if [ -n "$CONTINUE" -a "${CONTINUE:0:1}" = "Y" ] 
then
    # update JSON with merged .member_usernames
    NEWJSON=$( echo $JSON | jq ".member_usernames = (( .member_usernames + [ ${ULIST:0:${#ULIST}-2} ] ) | unique )" )
    curl -H "X-ArchivesSpace-Session: $SESSION" -d "$NEWJSON" -s ${BASE}$GROUP_URI   # POST-IT, returns status
    curl -H "X-ArchivesSpace-Session: $SESSION" -s ${BASE}$GROUP_URI | jq .member_usernames # and echo updated results
fi
fi