backport: Drop depenency on base64 (#778)

Ref: ba0733e

Author: Earlopain

http.gemspec

@@ -28,7 +28,6 @@ Gem::Specification.new do |gem|
   gem.required_ruby_version = ">= 2.6"
 
   gem.add_runtime_dependency "addressable",    "~> 2.8"
-  gem.add_runtime_dependency "base64",         "~> 0.1"
   gem.add_runtime_dependency "http-cookie",    "~> 1.0"
   gem.add_runtime_dependency "http-form_data", "~> 2.2"
   gem.add_runtime_dependency "llhttp-ffi",     "~> 0.5.0"

lib/http/base64.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+module HTTP
+  module Base64
+    module_function
+
+    # Equivalent to Base64.strict_encode64
+    def encode64(input)
+      [input].pack("m0")
+    end
+  end
+end

lib/http/chainable.rb

@@ -1,11 +1,12 @@
 # frozen_string_literal: true
 
-require "base64"
-
+require "http/base64"
 require "http/headers"
 
 module HTTP
   module Chainable
+    include HTTP::Base64
+
     # Request a get sans response body
     # @param uri
     # @option options [Hash]
@@ -215,7 +216,7 @@ def basic_auth(opts)
       pass  = opts.fetch(:pass)
       creds = "#{user}:#{pass}"
 
-      auth("Basic #{Base64.strict_encode64(creds)}")
+      auth("Basic #{encode64(creds)}")
     end
 
     # Get options for HTTP

lib/http/request.rb

@@ -1,9 +1,9 @@
 # frozen_string_literal: true
 
 require "forwardable"
-require "base64"
 require "time"
 
+require "http/base64"
 require "http/errors"
 require "http/headers"
 require "http/request/body"
@@ -15,6 +15,7 @@ module HTTP
   class Request
     extend Forwardable
 
+    include HTTP::Base64
     include HTTP::Headers::Mixin
 
     # The method given was not understood
@@ -159,7 +160,7 @@ def include_proxy_authorization_header
     end
 
     def proxy_authorization_header
-      digest = Base64.strict_encode64("#{proxy[:proxy_username]}:#{proxy[:proxy_password]}")
+      digest = encode64("#{proxy[:proxy_username]}:#{proxy[:proxy_password]}")
       "Basic #{digest}"
     end