Allow Net::HTTP to fetch user/pass from http_proxy

Note that this feature is enabled only on environment variables are
multi-user safe. In this time the list includes Linux, FreeBSD, or
Darwin. [Bug #12921]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58461 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

NEWS

@@ -55,6 +55,11 @@ with all sufficient information, see the ChangeLog file or Redmine
 
 === Stdlib updates (outstanding ones only)
 
+* Net::HTTP
+  * Net::HTTP#proxy_user and Net::HTTP#proxy_pass now reflects http_proxy
+    environment variable if the system's environment variable is multiuser
+    safe. [Bug #12921]
+
 * RbConfig
   * New constants:
     * RbConfig::LIMITS is added to provide the limits of C types.

lib/net/http.rb

@@ -1080,14 +1080,29 @@ module Net   #:nodoc:
       end
     end
 
-    # The proxy username, if one is configured
-    def proxy_user
-      @proxy_user
+    # [Bug #12921]
+    if /linux|freebsd|darwin/ =~ RUBY_PLATFORM
+      ENVIRONMENT_VARIABLE_IS_MULTIUSER_SAFE = true
+    else
+      ENVIRONMENT_VARIABLE_IS_MULTIUSER_SAFE = false
     end
 
-    # The proxy password, if one is configured
+    # The username of the proxy server, if one is configured.
+    def proxy_user
+      if ENVIRONMENT_VARIABLE_IS_MULTIUSER_SAFE && @proxy_from_env
+        proxy_uri&.user
+      else
+        @proxy_user
+      end
+    end
+
+    # The password of the proxy server, if one is configured.
     def proxy_pass
-      @proxy_pass
+      if ENVIRONMENT_VARIABLE_IS_MULTIUSER_SAFE && @proxy_from_env
+        proxy_uri&.password
+      else
+        @proxy_pass
+      end
     end
 
     alias proxyaddr proxy_address   #:nodoc: obsolete

test/net/http/test_http.rb

@@ -134,6 +134,23 @@ class TestNetHTTP < Test::Unit::TestCase
     end
   end
 
+  def test_proxy_eh_ENV_with_user
+    clean_http_proxy_env do
+      ENV['http_proxy'] = 'http://foo:bar@proxy.example:8000'
+
+      http = Net::HTTP.new 'hostname.example'
+
+      assert_equal true, http.proxy?
+      if Net::HTTP::ENVIRONMENT_VARIABLE_IS_MULTIUSER_SAFE
+        assert_equal 'foo', http.proxy_user
+        assert_equal 'bar', http.proxy_pass
+      else
+        assert_nil http.proxy_user
+        assert_nil http.proxy_pass
+      end
+    end
+  end
+
   def test_proxy_eh_ENV_none_set
     clean_http_proxy_env do
       assert_equal false, Net::HTTP.new('hostname.example').proxy?