Adds method to move tables to CSV with redacted data.

lib/pseudonymity/table.rb

+require 'digest'
+require 'csv'
+
+module Pseudonymity
+  class Anon
+    def initialize(fields)
+      @anon_fields = fields
+    end
+
+    def anonymize(results)
+
+      results.collect! do | r |
+        new_hash = r.each_with_object({}) do | (k, v), h |
+          if @anon_fields.include? k
+            h[k] = Digest::SHA2.new(256).hexdigest v
+          else
+            h[k] = v
+          end
+        end
+        new_hash
+      end
+    end
+  end
+
+  class Table
+    class << self
+      def table_to_csv(table, whitelist_columns, pseudonymity_columns)
+        sql = "SELECT #{whitelist_columns.join(",")} from #{table}"
+        results = ActiveRecord::Base.connection.exec_query(sql)
+        anon = Anon.new(pseudonymity_columns)
+        results = anon.anonymize results
+        write_to_csv_file table, results
+      end
+
+      def write_to_csv_file(title, contents)
+        file_path = "/tmp/#{title}"
+        if contents.empty?
+          File.open(file_path, "w") {}
+          return file_path
+        end
+        column_names = contents.first.keys
+        contents = CSV.generate do | csv |
+          csv << column_names
+          contents.each do |x|
+            csv << x.values
+          end
+        end
+        File.open(file_path, 'w') { |file| file.write(contents) }
+        return file_path
+      end
+
+      private :write_to_csv_file
+    end
+  end
+end
\ No newline at end of file

lib/tasks/gitlab/db.rake

@@ -69,5 +69,59 @@ namespace :gitlab do
 
       Gitlab::DowntimeCheck.new.check_and_print(migrations)
     end
+
+    desc 'Output pseudonymity dump of selected table'
+    task :pseudonymity_dump => :environment do
+      # issue* tables
+      # label* tables
+      # licenses
+      # merge_request* tables
+      # milestones
+      # namespace_statistics
+      # namespaces
+      # notes
+      # notification_settings
+      # project* tables
+      # subscriptions
+      # users
+
+      # REMOVE PRODUCTION INFRA SCRIPT AS PART OF MR> 
+      puts Pseudonymity::Table.table_to_csv("approvals",
+        ["id","merge_request_id","user_id","created_at","updated_at"],
+        ["id", "merge_request_id", "user_id"])
+      puts Pseudonymity::Table.table_to_csv("approver_groups",
+        ["id","target_type","group_id","created_at","updated_at"],
+        ["id","group_id"])
+      puts Pseudonymity::Table.table_to_csv("board_assignees",
+        ["id","board_id","assignee_id"],
+        ["id","board_id","assignee_id"])
+      puts Pseudonymity::Table.table_to_csv("board_labels",
+        ["id","board_id","label_id"],
+        ["id","board_id","label_id"])
+      puts Pseudonymity::Table.table_to_csv("boards",
+        ["id","project_id","created_at","updated_at","milestone_id","group_id","weight"],
+        ["id","project_id","milestone_id","group_id"])
+      puts Pseudonymity::Table.table_to_csv("epic_issues",
+        ["id","epic_id","issue_id","relative_position"],
+        ["id","epic_id","issue_id"])
+      puts Pseudonymity::Table.table_to_csv("epic_metrics",
+        ["id","epic_id","created_at","updated_at"],
+        ["id"])
+      puts Pseudonymity::Table.table_to_csv("epics",
+        ["id", "milestone_id", "group_id", "author_id", "assignee_id", "iid", "cached_markdown_version", "updated_by_id", "last_edited_by_id", "lock_version", "start_date", "end_date", "last_edited_at", "created_at", "updated_at", "title", "description"],
+        ["id", "milestone_id", "group_id", "author_id", "assignee_id", "iid", "cached_markdown_version", "updated_by_id", "last_edited_by_id", "lock_version", "start_date", "end_date", "last_edited_at", "created_at", "updated_at"])
+      puts Pseudonymity::Table.table_to_csv("issue_assignees",
+        ["user_id","issue_id"],
+        ["user_id","issue_id"])
+      puts Pseudonymity::Table.table_to_csv("issue_links",
+        ["id", "source_id", "target_id", "created_at", "updated_at"],
+        ["id", "source_id", "target_id"])
+      puts Pseudonymity::Table.table_to_csv("issue_metrics",
+        [],
+        [])
+      puts Pseudonymity::Table.table_to_csv("issues",
+        [],
+        [])
+    end
   end
 end