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module InternalRedirect
extend ActiveSupport::Concern
def safe_redirect_path(path)
return unless path
# Verify that the string starts with a `/` but not a double `/`.
return unless path =~ %r{^/\w.*$}
uri = URI(path)
# Ignore anything path of the redirect except for the path, querystring and,
# fragment, forcing the redirect within the same host.
full_path_for_uri(uri)
rescue URI::InvalidURIError
nil
end
def safe_redirect_path_for_url(url)
return unless url
uri = URI(url)
safe_redirect_path(full_path_for_uri(uri)) if host_allowed?(uri)
rescue URI::InvalidURIError
nil
end
def sanitize_redirect(url_or_path)
safe_redirect_path(url_or_path) || safe_redirect_path_for_url(url_or_path)
end
def host_allowed?(uri)
uri.host == request.host &&
uri.port == request.port
end
def full_path_for_uri(uri)
path_with_query = [uri.path, uri.query].compact.join('?')
[path_with_query, uri.fragment].compact.join("#")
end
end
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