resolves #281 prevent document from overriding epubcheck/kindlegen path attributes

CHANGELOG.adoc

@@ -10,6 +10,7 @@ For a detailed view of what has changed, refer to the {uri-repo}/commits/master[
 * fix chapter titles to actually be chapter titles instead of document title (#343)
 * store syntax highlighter CSS in a separate file (#339)
 * initial landmarks support: appendix, bibliography, bodymatter, cover, frontmatter, glossary, index, preface, toc (#174)
+* prevent document from overriding epubcheck/kindlegen path attributes (#281)
 
 == 1.5.0.alpha.17 (2020-05-25) - @slonopotamus
 

lib/asciidoctor-epub3/converter.rb

@@ -98,6 +98,15 @@ def initialize backend, opts = {}
         basebackend 'html'
         outfilesuffix '.epub' # dummy outfilesuffix since it may be .mobi
         htmlsyntax 'xml'
+
+        attr_overrides = opts[:document].instance_variable_get :@attribute_overrides
+        if attr_overrides.nil?
+          logger.error 'Failed to prevent document from overriding epubcheck/kindlegen path attributes'
+        else
+          # Prevent document fro overriding paths to binaries that we execute
+          attr_overrides['ebook-epubcheck-path'] ||= nil
+          attr_overrides['ebook-kindlegen-path'] ||= nil
+        end
       end
 
       def convert node, name = nil, _opts = {}

spec/converter_spec.rb

@@ -328,5 +328,19 @@
 </tr>
       EOS
     end
+
+    it 'prevents document from overriding kindlegen/epubcheck path attributes' do
+      book = to_epub <<~EOS
+= Article
+:ebook-kindlegen-path: /evilgen
+:ebook-epubcheck-path: /evilcheck
+
+{ebook-epubcheck-path}
+{ebook-kindlegen-path}
+      EOS
+
+      article = book.item_by_href '_article.xhtml'
+      expect(article.content).not_to include('evil')
+    end
   end
 end