extended input validation

giteainstall

@@ -60,15 +60,6 @@ usage() {
     printf -- "  -h | -help | --help   Show this help screen\n\n"
 }
 
-#
-# Function inputcheck
-#
-inputcheck () {
-    [[ -z "$hostname" ]] && { usage; echo "ERROR: DOMAIN CANNOT BE EMPTY!"; exit 1; }
-    [[ "$hostname" =~ [[:space:]/] ]] && { echo "ERROR: DOMAIN INVALID (no spaces or slashes allowed)"; exit 1; }
-    [[ -z "$dbpass" ]] && { usage; echo "ERROR: DATABASE PASSWORD CANNOT BE EMPTY!"; exit 1; }
-}
-
 #
 # Let's go
 #
@@ -97,9 +88,42 @@ while getopts "n:p:m:a:h" option; do
 done
 
 #
-# Check if input conditions are met
+# Validate hostname and database password
 #
-inputcheck "$hostname" "$dbpass"
+if [[ -z "$hostname" || -z "$dbpass" ]]; then
+    usage
+    printf "\nERROR: Both -n (domain) and -p (database password) are required.\n\n"
+    exit 1
+fi
+
+# Convert to lowercase (domains are case-insensitive)
+hostname=$(echo "$hostname" | tr '[:upper:]' '[:lower:]')
+
+# Disallow leading hyphen
+if [[ "$hostname" =~ ^- ]]; then
+    printf "\nERROR: Domain cannot start with a hyphen.\n"
+    printf "Example of valid input: git.example.com\n\n"
+    exit 1
+fi
+
+# Disallow spaces, slashes, underscores
+if [[ "$hostname" =~ [[:space:]/_] ]]; then
+    printf "\nERROR: Domain cannot contain spaces, slashes, or underscores.\n\n"
+    exit 1
+fi
+
+# Validate domain format (RFC 1123)
+if [[ ! "$hostname" =~ ^([a-z0-9]+(-[a-z0-9]+)*\.)+[a-z]{2,}$ ]]; then
+    printf "\nERROR: Invalid domain format.\n"
+    printf "Example of valid input: git.example.com\n\n"
+    exit 1
+fi
+
+# Check for spaces in DB credentials
+if [[ "$dbpass" =~ [[:space:]] ]]; then
+    printf "\nERROR: Database password cannot contain spaces.\n\n"
+    exit 1
+fi
 
 #
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