wip helper functions logic

Author: manu4543

lib/imagekit/client.rb

@@ -100,7 +100,7 @@ def initialize(
 
       base_url ||= "https://api.imagekit.io"
 
-      if private_key.nil?
+      if private_key.nil? || private_key.to_s.empty?
         raise ArgumentError.new("private_key is required, and can be set via environ: \"IMAGEKIT_PRIVATE_KEY\"")
       end
 

lib/imagekit/helpers/crypto_utils.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require "openssl"
+require "digest"
+
+module Imagekit
+  module Helpers
+    # Crypto utilities for ImageKit SDK
+    # Provides HMAC-SHA1 functionality for URL signing and authentication
+    module CryptoUtils
+      class << self
+        # Creates an HMAC-SHA1 hash
+        #
+        # @param key [String] The secret key for HMAC generation
+        # @param data [String] The data to be signed
+        # @return [String] Hex-encoded HMAC-SHA1 hash
+        # @raise [StandardError] if HMAC generation fails
+        def create_hmac_sha1(key, data)
+          OpenSSL::HMAC.hexdigest("SHA1", key, data)
+        rescue StandardError => e
+          raise StandardError, "Failed to generate HMAC-SHA1 signature: #{e.message}"
+        end
+      end
+    end
+  end
+end