This document describes the top level Higgins 2.0 PDS components under active development. Here are the bugzilla component names:
- H2-PDS Support
- H2-Data Model
There are two front end components: a web client, and a browser extension.
The Higgins browser extension makes possible functionality like browser-side integration with other web APIs and sites, scraping and form filling.
- .chrome.bx - Chrome-only Higgins Browser Extension
- .js.pds.cde - Connection Data Engine. Loads CDE-compatible JSON Scripts (See App-data vocabulary) from templates and uses them to implement auto-login, auto-registration, form filling, etc.
When the user's browser lands on a new webpage it:
- Determines if the current PDS user is currently logged in.
- This requires there be a template for the current site (domain) and that it contains an IsLoggedIn script
- It is possible that a different PDS user (not the current PDS user) is currently logged in.
- If the user is not logged in then
- It automatically logs the user in (or should it just auto-fill in the userid/password and wait for the user to click?)
- Looks for every appropriate form on the page
- Automatically fills in each form as best it can -- this requires there be a template for the current site (domain) and that it contains a Fill script for this form (is there one fill script container with lots of per-form-submit-URL scripts? Or are there lots of Fill scripts each with an for-this-form-submit-URL attribute?
- Waits for the user to submit a form (including a login form with or without a custom template?)
- Scrapes the form submit data and writes it into the PDS. If it is a login form then it writes into the proxy object, else the corresponding context
Web client interactions
When the user opens a connection editor page (e.g. to edit the nytimes.com connection):
- The BX immediately starts a background process to login and scrape the latest data values from the site.
- This is necessary because the user may have gone to the site directly (not using the PDS) and updated data values. A progress bar that shows this background process.
- If the user edits an attribute it writes the updated attribute value to the site.
- If this "write" operation happens before the background sync completes, there is some possibility for sync collisions and and confusion.
Back End Components
There are three back end components mostly written in Java and running in the cloud (e.g. Amazon AWS):
- PDS Support
- .pds.usermanager.ws - simple web service to manage user accounts, change password, etc.
PDS Support Subcomponents:
- .pds.client - wrapper around Open Anzo java client
Attribute Data Storage
- PLANNED: .ads.ld - Linked Data endpoint
Data attributes whether created by the user or imported from an external service are stored in a common data model. This allows them to be consistently displayed to, and in some cases edited by, the user irrespective of its original source. We call this the Persona Data Model 2.0.