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48 lines
1.8 KiB
48 lines
1.8 KiB
module Carto
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module QueryRewriter
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def rewrite_query(query, old_username, new_user, renamed_tables)
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new_query = query
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new_query = rewrite_query_for_new_user(query, old_username, new_user) if old_username != new_user.database_schema
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new_query = rewrite_query_for_renamed_tables(new_query, renamed_tables) if renamed_tables.present?
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if test_query(new_user, new_query)
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new_query
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else
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CartoDB::Logger.debug(message: 'Did not rewrite query', old_query: query, new_query: new_query,
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old_username: old_username, user: new_user, renamed_tables: renamed_tables)
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query
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end
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end
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def qualify_query(query, table_name, username)
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query.gsub(/(?<!\.)("?#{table_name}"?)/, username + '.\\1')
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end
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private
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def test_query(user, query)
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user.in_database.execute("EXPLAIN (#{query})")
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true
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rescue
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false
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end
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def rewrite_query_for_new_user(query, old_username, new_user)
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if new_user.username == new_user.database_schema
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new_schema = new_user.sql_safe_database_schema
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query.gsub(" #{old_username}.", " #{new_schema}.").gsub(" \"#{old_username}\".", " #{new_schema}.")
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else
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query.gsub(" #{old_username}.", " ").gsub(" \"#{old_username}\".", " ")
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end
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end
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PSQL_WORD_CHARS = '[$_[[:alnum:]]]'.freeze
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def rewrite_query_for_renamed_tables(query, renamed_tables)
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renamed_tables.reduce(query) do |sql, (old_name, new_name)|
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# Replaces the table name only if it matches the whole word
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# i.e: previous and next characters are not PSQL_WORD_CHARS (alphanumerics, _ or $)
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sql.gsub(/(?<!#{PSQL_WORD_CHARS})#{Regexp.escape(old_name)}(?!#{PSQL_WORD_CHARS})/, new_name)
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end
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end
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end
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end
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