Class: Decidim::AuthorizationHandler

Inherits:
Form
  • Object
show all
Defined in:
app/services/decidim/authorization_handler.rb

Overview

This is the base class for authorization handlers, all implementations should inherit from it. Each AuthorizationHandler is a form that will be used to check if the authorization is valid or not. When it is valid a new authorization will be created for the user.

Feel free to use validations to assert fields against a remote API, local database, or whatever.

It also sets two default attributes, ‘user` and `handler_name`.

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Form

#available_locales

Class Method Details

.handler_for(name, params = {}) ⇒ Object

Finds a handler class from a String. This is necessary when processing the form data. It will only look for valid handlers that have also been configured in ‘Decidim.authorization_handlers`.

name - The String name of the class to find, usually in the same shape as the one returned by ‘handler_name`. params - An optional Hash with params to initialize the handler.

Returns an AuthorizationHandler descendant. Returns nil when no handlers could be found.



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# File 'app/services/decidim/authorization_handler.rb', line 85

def self.handler_for(name, params = {})
  return unless name
  handler_klass = name.classify
  return unless Decidim.authorization_handlers.map(&:to_s).include?(handler_klass)
  handler_klass.constantize.from_params(params || {})
end

.handler_name ⇒ Object

A serialized version of the handler’s name.

Returns a String.



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# File 'app/services/decidim/authorization_handler.rb', line 64

def self.handler_name
  name.underscore
end

Instance Method Details

#form_attributes ⇒ Object

THe attributes of the handler that should be exposed as form input when rendering the handler in a form.

Returns an Array of Strings.



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# File 'app/services/decidim/authorization_handler.rb', line 33

def form_attributes
  attributes.except(:id, :user).keys
end

#handler_name ⇒ Object

Same as the class method but accessible from the instance.

Returns a String.



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# File 'app/services/decidim/authorization_handler.rb', line 71

def handler_name
  self.class.handler_name
end

#metadata ⇒ Object

Any data that the developer would like to inject to the ‘metadata` field of an authorization when it’s created. Can be useful if some of the params the user sent with the authorization form want to be persisted for future use.

Returns a Hash.



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# File 'app/services/decidim/authorization_handler.rb', line 57

def metadata
  {}
end

#to_partial_path ⇒ Object

The String partial path so Rails can render the handler as a form. This is useful if you want to have a custom view to render the form instead of the default view.

Example:

A handler named Decidim::CensusHandler would look for its partial in:
decidim/census/form

Returns a String.



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# File 'app/services/decidim/authorization_handler.rb', line 47

def to_partial_path
  handler_name.sub!(/_handler$/, "") + "/form"
end

#unique_id ⇒ Object

A unique ID to be implemented by the authorization handler that ensures no duplicates are created. This uniqueness check will be skipped if unique_id returns nil.



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# File 'app/services/decidim/authorization_handler.rb', line 25

def unique_id
  nil
end