class DropboxController

# File examples/dropbox_controller.rb, line 90
def auth_finish
  begin
    access_token, user_id, url_state = get_web_auth.finish(params)
    session[:access_token] = access_token
    redirect_to :action => 'main'
  rescue DropboxOAuth2Flow::BadRequestError => e
    render :text => "Error in OAuth 2 flow: Bad request: #{e}"
  rescue DropboxOAuth2Flow::BadStateError => e
    logger.info("Error in OAuth 2 flow: No CSRF token in session: #{e}")
    redirect_to(:action => 'auth_start')
  rescue DropboxOAuth2Flow::CsrfError => e
    logger.info("Error in OAuth 2 flow: CSRF mismatch: #{e}")
    render :text => "CSRF error"
  rescue DropboxOAuth2Flow::NotApprovedError => e
    render :text => "Not approved?  Why not, bro?"
  rescue DropboxOAuth2Flow::ProviderError => e
    logger.info "Error in OAuth 2 flow: Error redirect from Dropbox: #{e}"
    render :text => "Strange error."
  rescue DropboxError => e
    logger.info "Error getting OAuth 2 access token: #{e}"
    render :text => "Error communicating with Dropbox servers."
  end
end

# File examples/dropbox_controller.rb, line 82
def auth_start
  authorize_url = get_web_auth().start()

  # Send the user to the Dropbox website so they can authorize our app.  After the user
  # authorizes our app, Dropbox will redirect them here with a 'code' parameter.
  redirect_to authorize_url
end

# File examples/dropbox_controller.rb, line 64
def get_dropbox_client
  if session[:access_token]
    begin
      access_token = session[:access_token]
      DropboxClient.new(access_token)
    rescue
      # Maybe something's wrong with the access token?
      session.delete(:access_token)
      raise
    end
  end
end

# File examples/dropbox_controller.rb, line 77
def get_web_auth()
  redirect_uri = url_for(:action => 'auth_finish')
  DropboxOAuth2Flow.new(APP_KEY, APP_SECRET, redirect_uri, session, :dropbox_auth_csrf_token)
end

# File examples/dropbox_controller.rb, line 31
def main
  client = get_dropbox_client
  unless client
    redirect_to(:action => 'auth_start') and return
  end

  account_info = client.account_info

  # Show a file upload page
  render :inline =>
    "#{account_info['email']} <br/><%= form_tag({:action => :upload}, :multipart => true) do %><%= file_field_tag 'file' %><%= submit_tag 'Upload' %><% end %>"
end

# File examples/dropbox_controller.rb, line 44
def upload
  client = get_dropbox_client
  unless client
    redirect_to(:action => 'auth_start') and return
  end

  begin
    # Upload the POST'd file to Dropbox, keeping the same name
    resp = client.put_file(params[:file].original_filename, params[:file].read)
    render :text => "Upload successful.  File now at #{resp['path']}"
  rescue DropboxAuthError => e
    session.delete(:access_token)  # An auth error means the access token is probably bad
    logger.info "Dropbox auth error: #{e}"
    render :text => "Dropbox auth error"
  rescue DropboxError => e
    logger.info "Dropbox API error: #{e}"
    render :text => "Dropbox API error"
  end
end