A simple server to manage a collection of bottle caps, including their names, images, and a classifier to recognize them by image.
Works together with the companion app [Caps-iOS](https://christophhagen.de/git/ch/Caps-iOS).
A description of the project is provided [on my website](https://christophhagen.de/projects/software/caps/en.html).
## Overview
The server maintains the cap database of all bottle caps that I've collected so far, and allows me to add new caps, images and classifiers using the associated [iOS App](https://christophhagen.de/git/ch/Caps-iOS).
It currently has the following functions:
- Provide the data (name, id, image count, ...) for all existing caps
- Serve a representative image for each cap, and maintain the image catalog for classifier training
- Add new caps through the iOS App
- Add new images through the app
- Rename caps and change the main image
- Protect the database from changes through token-based authentication
- Host a classifier model to download for offline cap classification
- Upload new classifiers when trained on a different system using CreateML
- Provide a script to train a new classifier on the current image set
- Provide an HTML snippet which can be embedded in a website to show the current cap count ([see here](https://christophhagen.de/projects/software/caps/en.html))
- Provide a webpage showing a grid of all caps, where mosaic images can be created.
## Configuration
The server is configured using a configuration file `config.json` located in the `Resources` folder:
```json
{
"port" : 6001,
"maxBodySize" : "2mb",
"logPath": "\/var\/log\/caps.log",
"serveFiles": true,
"writers" : [
"auth_key_1"
]
}
```
The `writers` array contains a list of strings acting as access tokens to restrict operations where data is mutated (adding images, changing information, updating the classifier).
## Mosaic
The server provides a simple web page where visitors can arrange the existing bottle caps in a grid, to create mosaic images from the caps.
It allows loading and saving arrangements locally, and has the option to display the average color of the caps.
You can try it [here](https://christophhagen.de/caps/grid.html).
Note: The data for the mosaic is currently not updated automatically, since Swift on Linux has no built-in tools to create JPGs. The thumbnails are created when a new classifier is trained.
## Classifier training
The main server is running on Linux, which doesn't provide the CreateML framework required for classifier training.
