Add #before_download method to FileDownload mixin

Author: rastating

lib/wpxf/wordpress/file_download.rb

@@ -76,12 +76,18 @@ def validate_content(content)
     true
   end
 
+  # A task to run before the download starts.
+  # @return [Boolean] true if pre-download operations were successful.
+  def before_download
+    true
+  end
+
   # Run the module.
   # @return [Boolean] true if successful.
   def run
     validate_implementation
 
-    return false unless super
+    return false unless super || !before_download
 
     res = request_file
     return false unless validate_result(res) && validate_content(res.body)

spec/wordpress/file_download_spec.rb

@@ -38,5 +38,11 @@
         'A value must be specified for #working_directory'
       )
     end
+
+    it 'when #before_download returns false, return false' do
+      allow(subject).to receive(:before_download).and_return(false)
+      allow(subject).to receive(:working_directory).and_return('wp-content')
+      expect(subject.run).to be false
+    end
   end
 end