carrierwave

https://github.com/carrierwaveuploader/carrierwave

Ruby

Classier solution for file uploads for Rails, Sinatra and other Ruby web frameworks

CarrierWave::Uploader::ExtensionBlacklist#extension_blacklist

[NilClass, String, Regexp, Array[String, Regexp]] a black list of extensions which are prohibited to be uploaded

=== Examples

    def extension_blacklist
      %w(swf tiff)
    end

Basically the same, but using a Regexp:

    def extension_blacklist
      [/swf/, 'tiff']
    end

Source | Google | Stack overflow

Edit

git clone [email protected]:carrierwaveuploader/carrierwave.git

cd carrierwave

open lib/carrierwave/uploader/extension_blacklist.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-CarrierWave--Uploader--ExtensionBlacklist-extension_blacklist-for-pr

# Commit to git

git add lib/carrierwave/uploader/extension_blacklist.rbgit commit -m "better docs for CarrierWave::Uploader::ExtensionBlacklist#extension_blacklist"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-CarrierWave--Uploader--ExtensionBlacklist-extension_blacklist-for-pr

hub pull-request

# Celebrate!