Update apache_conf regular expression to exclude whitespace. (#2416)

* Update apache_conf test to check for ServerAlias values.

Signed-off-by: Miah Johnson <miah@chia-pet.org>

* Add ServerAlias key and values to mock apache conf which includes
trailing whitespace.

Signed-off-by: Miah Johnson <miah@chia-pet.org>

* Updated test to reflect all ServerAlias values being put into a single
array item. This is expected as we do not override the key_values
default setting of '1' when passing the raw configuration to
SimpleConfig.

Signed-off-by: Miah Johnson <miah@chia-pet.org>

* Update the regular expression to include a conditional with positive
lookahead that checks if the line ends with one or more spaces. If the
lookahead succeeds we non-greedily capture, and when it fails we
greedily capture.

Signed-off-by: Miah Johnson <miah@chia-pet.org>

lib/resources/apache_conf.rb

@@ -78,10 +78,17 @@ module Inspec::Resources
         raw_conf = read_file(to_read[0])
         @content += raw_conf
 
-        # parse include file parameters
+        # An explaination of the below regular expression.
+        # Creates two capture groups.
+        # The first group captures the first group of non-whitespace character
+        # surrounded whitespace characters.
+        # The second group contains a conditional with a positive lookahead
+        # (does the line end with one or more spaces?). If the lookahead succeeds
+        # a non-greedy capture takes place, if it fails then a greedy capture takes place.
+        # The regex is terminated by an expression that matches zero or more spaces.
         params = SimpleConfig.new(
           raw_conf,
-          assignment_regex: /^\s*(\S+)\s+(.*)\s*$/,
+          assignment_regex: /^\s*(\S+)\s+((?=.*\s+$).*?|.*)\s*$/,
           multiple_values: true,
         ).params
         @params.merge!(params)

test/unit/mock/files/apache2.conf

@@ -1,5 +1,6 @@
 # This is the main Apache server configuration file.  It contains comments.
 ServerRoot "/etc/apache2"
+ServerAlias inspec.test www.inspec.test io.inspec.test 
 
 User ${APACHE_RUN_USER}
 Include ports.conf

test/unit/resources/apache_conf_test.rb

@@ -12,6 +12,7 @@ describe 'Inspec::Resources::ApacheConf' do
     _(resource.params).must_be_kind_of Hash
     _(resource.content).must_be_kind_of String
     _(resource.params('ServerRoot')).must_equal ['"/etc/apache2"']
+    _(resource.params('ServerAlias')).must_equal ['inspec.test www.inspec.test io.inspec.test']
     _(resource.params('Listen').sort).must_equal ['443', '80']
     # sourced using a linked file in conf-enabled/
     _(resource.params('ServerSignature')).must_equal ['Off']