[WIP] Automate the process of granting read-only access to a database

bin/grant-readonly-access-for-PostgreSQL-user.sh

@@ -0,0 +1,82 @@
+#!/bin/bash -e 
+
+set -o errexit
+set -o pipefail
+set -u
+
+function usage() {
+    set -e
+    cat <<EOM
+    ##### grant-readonly-access-for-PostgreSQL-user #####
+    Crude script to grant read access for a non-owner PostgreSQL user to a database
+    Required arguments:
+        --user          Database user which requires read-only access to the specified database
+        --database      Database to which the specified user will have read-only access
+    Requirements:
+        1. The 'pqsl' binary must be installed and on the current \$PATH
+        2. This script must be run as user postgres
+        3. This script must be run from a shell local to the server running PostgreSQL
+
+    Example:
+      sudo -u postgres ./$0 --user "shield-agent-readonly" --database "shield-bases"
+EOM
+
+    exit 2
+}
+
+if [ $# == 0 ]; then usage; fi
+
+# Loop through arguments, two at a time for key and value
+while [[ $# -gt 0 ]]
+do
+    key="$1"
+
+    case $key in
+        --user)
+            DATABASE_USER="$2"
+            shift # past argument
+            ;;
+        --database)
+            DATABASE_TARGET="$2"
+            shift # past argument
+            ;;
+        *)
+            usage
+            exit 2
+        ;;
+    esac
+    shift # past argument or value
+done
+
+
+# TODO: 
+# create input parameters for --user and --database
+
+echo "Granting read-only access for database user '$DATABASE_USER' to database '$DATABASE_TARGET'"
+
+command1="GRANT USAGE ON SCHEMA public to \"$DATABASE_USER\";"
+psql --command "$command1"
+
+command2="ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO \"$DATABASE_USER\";"
+psql --command "$command2"
+
+command3="GRANT CONNECT ON DATABASE \"$DATABASE_TARGET\" to \"$DATABASE_USER\";"
+psql --command "$command3"
+
+command4="\c \"$DATABASE_TARGET\""
+psql --command "$command4"
+
+command5="ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT ALL ON TABLES TO \"$DATABASE_USER\";"
+psql --command "$command5"
+
+command6="GRANT USAGE ON SCHEMA public to \"$DATABASE_USER\";"
+psql --command "$command6"
+
+command7="GRANT SELECT ON ALL SEQUENCES IN SCHEMA public TO \"$DATABASE_USER\";"
+psql --command "$command7"
+
+command8="GRANT SELECT ON ALL TABLES IN SCHEMA public TO \"$DATABASE_USER\";"
+psql --command "$command8"
+
+echo ""
+echo "database user '$DATABASE_USER' has been granted read-only access to database '$DATABASE_TARGET'"