Develop PDF file management system on top of an existing Code Igniter 3 application basis

We have a Code Igniter 3 application basis which already provides a basis to develop the required functionalities on top of it. This basis already contains a Bootstrap template and is API driven as it uses the REST library from Phil Sturgeon and Chris Kacerguis: [login to view URL] NOTE: Experience with this library is mandatory. We need the following functionality built on top it: 1. Log in with Active Directory (LDAP) support: Create a login form that will connect to an Active Directory server to log the user into our system and retrieve necessary attributes which will then be used to update the user details in our own MySQL users table. After log in, the Main menu will contain the following items and the user will be sent to the Dashboard: - Dashboard - Articles The system will have 2 different permission roles (the application basis already provides a simple permission roles system you can use, you just need to configure the roles and check for permission throughout your controllers and views): - Admin - Regular user 2. Dashboard: Creation of a Dashboard home page with statistical information about total files, total downloads, last user accesses, and the last added PDF files. 3. Articles: Searchable list of articles that can be filtered by user Department (see previous point). Upload PDF files by dropping a file in any web page of the whole system (not only on the Articles page). Automatically collect metadata via API from [login to view URL] by using any of the following means for article identification: 1. Use DOI (digital object identifier, may be present in PDF metadata) 2. If previous point fails, use combination of PDF metadata: Title + Author + Publisher + Year 3. If again previous point fails, attempt to extract title from PDF contents 4. If all points have failed, ask the user for PubMed ID. Advanced file search functionality to enable the user to search easily for articles on 6 specific metadata fields. Regular users can only delete their own uploaded files. Admin users can delete any file. Clicking on an article in the list attempts to load the article in a viewer on top of the current page, or initiate a file download. In both cases a file download action needs to be recorded. Total downloads per file need to be shown in the Articles List. Listing and searching of articles needs to be lightning fast as the user has currently more than 300.000 PDF files that they would like to manage through this system. Everything needs to be API driven using the above mentioned REST library and in accordance to the already present functionality, which actually gives you a very clear idea about how we would like things to be implemented. All functionality must be unit-tested up to a medium level. You can use the simple unit testing library from Code Igniter itself for this.