1 files changed, 69 insertions, 0 deletions
diff --git a/app/models/token.rb b/app/models/token.rb
new file mode 100644
index 0000000..4856c31
--- /dev/null
+++ b/app/models/token.rb
@@ -0,0 +1,69 @@
+class Token < CouchRest::Model::Base
+
+  use_database :tokens
+
+  belongs_to :user
+
+  # timestamps! does not create setters and only sets updated_at
+  # if the object has changed and been saved. Instead of triggering
+  # that we rather use our own property we have control over:
+  property :last_seen_at, Time, accessible: false
+
+  validates :user_id, presence: true
+
+  design do
+    view :by_last_seen_at
+  end
+
+  def self.expires_after
+    APP_CONFIG[:auth] && APP_CONFIG[:auth][:token_expires_after]
+  end
+
+  def self.expired
+    return [] unless expires_after
+    by_last_seen_at.endkey(expires_after.minutes.ago)
+  end
+
+  def self.destroy_all_expired
+    self.expired.each do |token|
+      token.destroy
+    end
+  end
+
+  def authenticate
+    if expired?
+      destroy
+      return nil
+    else
+      touch
+      return user
+    end
+  end
+
+  # Tokens can be cleaned up in different ways.
+  # So let's make sure we don't crash if they disappeared
+  def destroy_with_rescue
+    destroy_without_rescue
+  rescue RestClient::ResourceNotFound
+  end
+  alias_method_chain :destroy, :rescue
+
+  def touch
+    self.last_seen_at = Time.now
+    save
+  end
+
+  def expired?
+    Token.expires_after and
+    last_seen_at < Token.expires_after.minutes.ago
+  end
+
+  def initialize(*args)
+    super
+    if new_record?
+      self.id = SecureRandom.urlsafe_base64(32).gsub(/^_*/, '')
+      self.last_seen_at = Time.now
+    end
+  end
+end
+