Remove dependency on base64 gem

Added in #3364. It's just a simple wrapper, so it's trivial to inline.

Add a new module to keep keep descriptive method names

Steepfile

@@ -588,7 +588,6 @@ target :datadog do
   library 'ipaddr'
   library 'net-http'
   library 'securerandom'
-  library 'base64'
   library 'digest'
   library 'zlib'
   library 'time'

datadog.gemspec

@@ -60,9 +60,6 @@ Gem::Specification.new do |spec|
   # rubies, see #1739 and #1336 for an extended discussion about this
   spec.add_dependency 'msgpack'
 
-  # Requiring base64 from stdlib is deprecated in Ruby v3.3 and will be removed in v3.4
-  spec.add_dependency 'base64'
-
   # Used by the profiler native extension to support Ruby < 2.6 and > 3.2
   #
   # We decided to pin it at the latest available version and will manually bump the dependency as needed.

lib/datadog/appsec/event.rb

@@ -2,9 +2,9 @@
 
 require 'json'
 require 'zlib'
-require 'base64'
 
 require_relative 'rate_limiter'
+require_relative '../core/utils/base64'
 
 module Datadog
   module AppSec
@@ -140,7 +140,7 @@ def build_service_entry_tags(event_group)
         private
 
         def compressed_and_base64_encoded(value)
-          Base64.encode64(gzip(value))
+          Datadog::Core::Utils::Base64.encode64(gzip(value))
         rescue TypeError => e
           Datadog.logger.debug do
             "Failed to compress and encode value when populating AppSec::Event. Error: #{e.message}"

lib/datadog/core/remote/client/capabilities.rb

@@ -1,5 +1,6 @@
 # frozen_string_literal: true
 
+require_relative '../../utils/base64'
 require_relative '../../../appsec/remote'
 require_relative '../../../tracing/remote'
 
@@ -53,7 +54,7 @@ def capabilities_to_base64
             cap_to_hexs = capabilities.reduce(:|).to_s(16).tap { |s| s.size.odd? && s.prepend('0') }.scan(/\h\h/)
             binary = cap_to_hexs.each_with_object([]) { |hex, acc| acc << hex }.map { |e| e.to_i(16) }.pack('C*')
 
-            Base64.encode64(binary).chomp
+            Datadog::Core::Utils::Base64.encode64(binary).chomp
           end
         end
       end

lib/datadog/core/remote/transport/http/config.rb

@@ -1,10 +1,10 @@
 # frozen_string_literal: true
 
 require 'json'
-require 'base64'
 
 require_relative '../config'
 require_relative 'client'
+require_relative '../../../utils/base64'
 require_relative '../../../transport/http/response'
 require_relative '../../../transport/http/api/endpoint'
 
@@ -51,7 +51,7 @@ def initialize(http_response, options = {}) # rubocop:disable Metrics/AbcSize,Me
 
                 # TODO: these fallbacks should be improved
                 roots = payload[:roots] || []
-                targets = payload[:targets] || Base64.encode64('{}').chomp
+                targets = payload[:targets] || Datadog::Core::Utils::Base64.encode64('{}').chomp
                 target_files = payload[:target_files] || []
                 client_configs = payload[:client_configs] || []
 
@@ -61,7 +61,7 @@ def initialize(http_response, options = {}) # rubocop:disable Metrics/AbcSize,Me
                   raise TypeError.new(String, root) unless root.is_a?(String)
 
                   decoded = begin
-                    Base64.strict_decode64(root) # TODO: unprocessed, don't symbolize_names
+                    Datadog::Core::Utils::Base64.strict_decode64(root) # TODO: unprocessed, don't symbolize_names
                   rescue ArgumentError
                     raise DecodeError.new(:roots, root)
                   end
@@ -81,7 +81,7 @@ def initialize(http_response, options = {}) # rubocop:disable Metrics/AbcSize,Me
 
                 @targets = begin
                   decoded = begin
-                    Base64.strict_decode64(targets)
+                    Datadog::Core::Utils::Base64.strict_decode64(targets)
                   rescue ArgumentError
                     raise DecodeError.new(:targets, targets)
                   end
@@ -109,7 +109,7 @@ def initialize(http_response, options = {}) # rubocop:disable Metrics/AbcSize,Me
                   raise TypeError.new(String, raw) unless raw.is_a?(String)
 
                   content = begin
-                    Base64.strict_decode64(raw)
+                    Datadog::Core::Utils::Base64.strict_decode64(raw)
                   rescue ArgumentError
                     raise DecodeError.new(:target_files, raw)
                   end

lib/datadog/core/utils/base64.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+module Datadog
+  module Core
+    module Utils
+      # Helper methods for encoding and decoding base64
+      module Base64
+        def self.encode64(bin)
+          [bin].pack('m')
+        end
+
+        def self.strict_encode64(bin)
+          [bin].pack('m0')
+        end
+
+        def self.strict_decode64(str)
+          str.unpack1('m0')
+        end
+      end
+    end
+  end
+end

sig/datadog/core/utils/base64.rbs

@@ -0,0 +1,14 @@
+module Datadog
+  module Core
+    module Utils
+      # Helper methods for encoding and decoding base64
+      module Base64
+        def self.encode64: (String bin) -> String
+
+        def self.strict_encode64: (String bin) -> String
+
+        def self.strict_decode64: (String str) -> untyped
+      end
+    end
+  end
+end

spec/datadog/core/remote/client_spec.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require 'spec_helper'
+require 'datadog/core/utils/base64'
 require 'datadog/core/remote/transport/http'
 require 'datadog/core/remote/client'
 
@@ -204,21 +205,21 @@
   let(:rules_data_response) do
     {
       'path' => 'datadog/603646/ASM_DD/latest/config',
-      'raw' => Base64.strict_encode64(rules_data).chomp
+      'raw' => Datadog::Core::Utils::Base64.strict_encode64(rules_data).chomp
     }
   end
 
   let(:blocked_ips_data_response) do
     {
       'path' => 'datadog/603646/ASM_DATA/blocked_ips/config',
-      'raw' => Base64.strict_encode64(blocked_ips).chomp
+      'raw' => Datadog::Core::Utils::Base64.strict_encode64(blocked_ips).chomp
     }
   end
 
   let(:exclusion_data_response) do
     {
       'path' => 'datadog/603646/ASM/exclusion_filters/config',
-      'raw' => Base64.strict_encode64(exclusions).chomp
+      'raw' => Datadog::Core::Utils::Base64.strict_encode64(exclusions).chomp
     }
   end
 
@@ -228,8 +229,8 @@
 
   let(:response_body) do
     {
-      'roots' => roots.map { |r| Base64.strict_encode64(r.to_json).chomp },
-      'targets' => Base64.strict_encode64(targets.to_json).chomp,
+      'roots' => roots.map { |r| Datadog::Core::Utils::Base64.strict_encode64(r.to_json).chomp },
+      'targets' => Datadog::Core::Utils::Base64.strict_encode64(targets.to_json).chomp,
       'target_files' => target_files,
       'client_configs' => client_configs,
     }.to_json
@@ -380,12 +381,12 @@
       context 'invalid response body' do
         let(:response_body) do
           {
-            'roots' => roots.map { |r| Base64.strict_encode64(r.to_json).chomp },
-            'targets' => Base64.strict_encode64(targets.to_json).chomp,
+            'roots' => roots.map { |r| Datadog::Core::Utils::Base64.strict_encode64(r.to_json).chomp },
+            'targets' => Datadog::Core::Utils::Base64.strict_encode64(targets.to_json).chomp,
             'target_files' => [
               {
                 'path' => 'datadog/603646/ASM/exclusion_filters/config',
-                'raw' => Base64.strict_encode64(exclusions).chomp
+                'raw' => Datadog::Core::Utils::Base64.strict_encode64(exclusions).chomp
               }
             ],
             'client_configs' => [

spec/datadog/core/remote/transport/http_spec.rb

@@ -2,6 +2,7 @@
 
 require 'spec_helper'
 
+require 'datadog/core/utils/base64'
 require 'datadog/core/remote/transport/http'
 require 'datadog/core/remote/transport/http/negotiation'
 require 'datadog/core/remote/transport/negotiation'
@@ -133,7 +134,7 @@
               env: Datadog.configuration.env,
               tags: [],
             },
-            capabilities: Base64.encode64(capabilities_binary).chomp,
+            capabilities: Datadog::Core::Utils::Base64.encode64(capabilities_binary).chomp,
           },
           cached_target_files: [],
         }
@@ -144,11 +145,11 @@
       let(:response_code) { 200 }
       let(:response_body) do
         encode = proc do |obj|
-          Base64.strict_encode64(obj).chomp
+          Datadog::Core::Utils::Base64.strict_encode64(obj).chomp
         end
 
         jencode = proc do |obj|
-          Base64.strict_encode64(JSON.dump(obj)).chomp
+          Datadog::Core::Utils::Base64.strict_encode64(JSON.dump(obj)).chomp
         end
 
         JSON.dump(

spec/datadog/core/remote/transport/integration_spec.rb

@@ -2,6 +2,7 @@
 
 require 'spec_helper'
 
+require 'datadog/core/utils/base64'
 require 'datadog/core/remote/transport/http'
 require 'datadog/core/remote/transport/http/negotiation'
 require 'datadog/core/remote/transport/negotiation'
@@ -89,7 +90,7 @@
               env: Datadog.configuration.env,
               tags: [],
             },
-            capabilities: Base64.encode64(capabilities_binary).chomp,
+            capabilities: Datadog::Core::Utils::Base64.encode64(capabilities_binary).chomp,
           },
           cached_target_files: [],
         }

spec/datadog/tracing/contrib/suite/integration_spec.rb

@@ -1,3 +1,4 @@
+require 'datadog/core/utils/base64'
 require 'datadog/tracing/contrib/support/spec_helper'
 
 require 'datadog'
@@ -72,7 +73,7 @@ def build(*dynamic_configurations)
 
         target_files << {
           'path' => target,
-          'raw' => Base64.strict_encode64(raw),
+          'raw' => Datadog::Core::Utils::Base64.strict_encode64(raw),
         }
 
         targets_targets[target] = {
@@ -85,7 +86,7 @@ def build(*dynamic_configurations)
 
       {
         'target_files' => target_files,
-        'targets' => Base64.strict_encode64(targets.to_json),
+        'targets' => Datadog::Core::Utils::Base64.strict_encode64(targets.to_json),
         'client_configs' => client_configs,
       }.to_json
     end