#360: extract Compress module (unzip/zipped) from god-class

Author: VasilevNStas

lib/baza-rb.rb

@@ -15,6 +15,7 @@
 require 'tempfile'
 require 'typhoeus'
 require 'zlib'
+require_relative 'baza-rb/compress'
 require_relative 'baza-rb/version'
 
 # Ruby client for the Zerocracy API.
@@ -34,6 +35,8 @@
 class BazaRb
   DEFAULT_CHUNK_SIZE = 1_000_000
 
+  include Compress
+
   # When the server failed (503).
   class ServerFailure < StandardError; end
 
@@ -562,32 +565,6 @@ def headers
     }
   end
 
-  # Decompress gzipped data.
-  #
-  # @param [String] data The gzipped data to decompress
-  # @return [String] The decompressed data
-  def unzip(data)
-    Zlib::GzipReader.new(StringIO.new(data)).read
-  rescue Zlib::GzipFile::Error => e
-    raise(BadCompression, "Failed to unzip #{data.bytesize} bytes: #{e.message}")
-  end
-
-  # Compress request parameters with gzip.
-  #
-  # @param [Hash] params The request parameters with :body and :headers keys
-  # @return [Hash] The modified parameters with compressed body and updated headers
-  def zipped(params)
-    io = StringIO.new
-    gz = Zlib::GzipWriter.new(io)
-    gz.write(params.fetch(:body))
-    gz.close
-    body = io.string
-    params.merge(
-      body:,
-      headers: params.fetch(:headers).merge({ 'Content-Encoding' => 'gzip', 'Content-Length' => body.bytesize })
-    )
-  end
-
   # Build the base URI for API requests.
   #
   # @return [Iri] The base URI object

lib/baza-rb/compress.rb

@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+# SPDX-FileCopyrightText: Copyright (c) 2024-2026 Zerocracy
+# SPDX-License-Identifier: MIT
+
+require 'stringio'
+require 'zlib'
+
+# Compression helpers for BazaRb.
+#
+# Provides gzip compression and decompression for request bodies
+# and response data.
+#
+# Author:: Yegor Bugayenko (yegor256@gmail.com)
+# Copyright:: Copyright (c) 2024-2026 Yegor Bugayenko
+# License:: MIT
+class BazaRb
+  # Compression helpers.
+  module Compress
+    # Decompress gzipped data.
+    #
+    # @param [String] data The gzipped data to decompress
+    # @return [String] The decompressed data
+    # @raise [BadCompression] If the data is not valid gzip
+    def unzip(data)
+      Zlib::GzipReader.new(StringIO.new(data)).read
+    rescue Zlib::GzipFile::Error => e
+      raise(BadCompression, "Failed to unzip #{data.bytesize} bytes: #{e.message}")
+    end
+
+    # Compress request parameters with gzip.
+    #
+    # @param [Hash] params The request parameters with :body and :headers keys
+    # @return [Hash] The modified parameters with compressed body and updated headers
+    def zipped(params)
+      io = StringIO.new
+      gz = Zlib::GzipWriter.new(io)
+      gz.write(params.fetch(:body))
+      gz.close
+      body = io.string
+      params.merge(
+        body:,
+        headers: params.fetch(:headers).merge({ 'Content-Encoding' => 'gzip', 'Content-Length' => body.bytesize })
+      )
+    end
+  end
+end