Refreshing a token sending scopes separated by + does not work

[danilokleber]

Steps to reproduce

Try to refresh a token sending the scope field with strings separated by +. The users of the API just tried to use the same format they used on issuing a token (authorization_code grant).

Expected behavior

It refreshes the access token like when sending scopes separated by space.

Actual behavior

It returns a 401 with:

{
  "error": "invalid_scope",
  "error_description": "O escopo requisitado é inválido, desconhecido ou malformado."
}

System configuration

Doorkeeper initializer:

# config/initializers/doorkeeper.rb
Doorkeeper.configure do
  optional_scopes SCOPES

  native_redirect_uri URIS 

  use_refresh_token

  grant_flows %w(authorization_code)

  skip_authorization do |_, client|
    client.scopes.include?("mobile")
  end
end

# just injects some stuff in the response
Doorkeeper::OAuth::TokenResponse.send :prepend, Doorkeeper::CustomTokenResponse

Ruby version: 2.6.10

Gemfile.lock:

Gemfile.lock content

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  remote: http://rubygems.org/
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PLATFORMS
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DEPENDENCIES
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RUBY VERSION
   ruby 2.6.10p210

BUNDLED WITH
   2.3.26