discourse/app/services/username_checker_service.rb

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class UsernameCheckerService
def check_username(username, email)
if username && username.length > 0
validator = UsernameValidator.new(username)
if !validator.valid_format?
{errors: validator.errors}
elsif !SiteSetting.call_discourse_hub?
check_username_locally(username)
else
check_username_with_hub_server(username, email)
end
elsif email and SiteSetting.call_discourse_hub?
username_from_hub = DiscourseHub.username_for_email(email)
if username_from_hub && User.username_available?(username_from_hub)
{suggestion: username_from_hub}
else
{suggestion: nil}
end
end
end
# Contact the Discourse Hub server
def check_username_with_hub_server(username, email)
available_locally = User.username_available?(username)
info = available_globally_and_suggestion_from_hub(username, email)
available_globally = info[:available_globally]
suggestion_from_discourse_hub = info[:suggestion_from_discourse_hub]
global_match = info[:global_match]
if available_globally && available_locally
{ available: true, global_match: (global_match ? true : false) }
elsif available_locally && !available_globally
if email.present?
# Nickname and email do not match what's registered on the discourse hub.
{ available: false, global_match: false, suggestion: suggestion_from_discourse_hub }
else
# The username is available locally, but is registered on the discourse hub.
# We need an email to see if the username belongs to this person.
# Don't give a suggestion until we get the email and try to match it with on the discourse hub.
{ available: false }
end
elsif available_globally && !available_locally
# Already registered on this site with the matching username and email address. Why are you signing up again?
{ available: false, suggestion: UserNameSuggester.suggest(username) }
else
# Not available anywhere.
render_unavailable_with_suggestion(suggestion_from_discourse_hub)
end
end
def render_unavailable_with_suggestion(suggestion)
{ available: false, suggestion: suggestion }
end
def check_username_locally(username)
if User.username_available?(username)
{ available: true }
else
{ available: false, suggestion: UserNameSuggester.suggest(username) }
end
end
def available_globally_and_suggestion_from_hub(username, email)
if email.present?
global_match, available, suggestion =
DiscourseHub.username_match?(username, email)
{ available_globally: available || global_match,
suggestion_from_discourse_hub: suggestion,
global_match: global_match }
else
args = DiscourseHub.username_available?(username)
{ available_globally: args[0],
suggestion_from_discourse_hub: args[1],
global_match: false }
end
end
end