OpenID Auth failure when avatar is to big

[BrutalBirdie]

Issue Description

It is currently the case that if your avatar from the OpenID client is too big, the auth fails and reports to the user:

You can't be authenticated. Please contact your administrator.

Error thrown by:

greenlight/app/controllers/external_controller.rb

Line 100 in 4f909ee

Rails.logger.error("Error during authentication: #{e}")

Related code and files:

• spec/fixtures/files/default-avatar.svg

greenlight/app/models/user.rb

Lines 60 to 63 in 4d67cd7

	validates :avatar,
	dimension: { width: { in: 1..300 }, height: { in: 1..300 } },
	content_type: Rails.configuration.uploads[:images][:formats],
	size: { less_than: Rails.configuration.uploads[:images][:max_size] }

greenlight/app/javascript/components/users/user/SetAvatar.jsx

Lines 110 to 111 in 4f909ee

	width={300}
	height={300}

Suggested Solution

If the avatar size can not be flexible or configurable by the administration, use the default spec/fixtures/files/default-avatar.svg as fallback and inform the user that his avatar was too big, and the fallback was used.
This way the auth does not fail to due to an avatar.