This is the Shop System of Oldenburg's Hackspace Mainframe.
The software has been developed as a credit based system for members of the hackspace. The system depends on a USB HID barcode scanner, which is used to establish user sessions (by scanning CODE39 based user codes) and buying products (by scanning their EAN). The members receive an invoice at the end of the month, which is also send to the hackspace's treasurer for further processing.
Since the user barcodes do not contain any advanced authentication mechanism, "security" is established by sending daily mails in addition to the monthly invoice mail. The daily mail (which is only sent if something has been bought) lists all products bought by the member on this day and the current total sum for the month.
The system provides the following features:
- time shifted daily mails (08:00-07:59 of the following day), so that there is a lower chance of purchases from one visit being split over two mails.
- native rendering of PDF invoices using Cairo (fast & lightweight)
- invoice mails are sent using text/plain and text/html
- support for sending a database backup to a mail address
- ncurses-like user interface
- basic audio support
The system administration is done using a simple web interface, which provides support for the following tasks:
- adding information about new products
- restocking products
- changing selling prices of products
- updating the user database by importing a userlist.csv (regularly generated by our treasurer)
The system consists of multiple daemons written in Rust, which communicate with each other using DBus.
cargo build