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+# Frontend
+The web frontend of the keytracker is a very simple single page app that uses the keytracker API via JS.
+It can be statically hosted, though you might need to consider configuring CORS on the server.
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+# Keytracker Backend
+This is the keytracker backend. It provides a stateless HTTP API for the Website and the Telegram Bot.
+
+## Installation & Configuration
+The backend is written in Python based on [Flask](https://flask.palletsprojects.com).
+See [here](https://flask.palletsprojects.com/en/1.1.x/installation/) for installation instructions.
+For development purpuses you can start the server with `python3 server.py`, however for production
+you should use a instead ([Flask Deployment](https://flask.palletsprojects.com/en/1.1.x/tutorial/deploy/)).
+
+The configuration is in `config`. An example configuration is provided in `example-config`. Start of by
+copying the example config: `cp example-config config` and edit to your needs.
+
+### Adding a key
+The keys are configured in the config file in the `Keys` section. There is one line for each key.
+You can use the script `generate_key.py` to generate the configuration line.  
+Please note that (as of now) not all changes are automatically synced to the database.
+Adding a key is no problem, however (as of now, this is a TODO) deleting a key is not yet supported:
+The token and history remain in the database and can still be used, however it is no longer possible
+to retrieve the key name and get a new auth token to query the keyholder.
+Changing the key name does also automatically update as the key name is not stored in the database.
+The same applies for the password. Note that when the password is changed all users that already
+have access to the keyholder data keep their access (The auth token remain valid)
+Changing the key id is equivalent to adding a new key and deleting the old key.
+Changing the claim token will automatically add the new token to the database, however the old token
+will not automatically be invalidated. To invalidate the old key (e.g. to invalidate a QR code),
+you can simply delete the old claim token from the database.
+
+## API Documentation
+You can use the API by GET and POST requests to `your-api-url.com/<target>`.
+All requests are stateless, that means there are no sessions. Authentication is implemented with the
+`X-Auth-Token` HTTP header which you need to provide on every request.
+
+*/auth* (POST)  
+Request an auth token to query the keyholder. You need to provide that password in the `pass` POST data.
+Note that you must also provide an already valid token (usually the claim token).
+
+*/claim* (POST)  
+Claim a key (which key is automatically determined by your token). The POST data must contain the `name`
+and `contact` as string with a length of at least two characters. This request returns a claim id.
+You can use it to find out whether you are still the current keyholder.
+
+*/keyholder* (GET)  
+Return up to 3 of the latest keyholder as JSON list (first element is the current keyholder):
+`[{"name": "<Name>", "contact": "<Contact>", "timestamp": <unix timestamp>}, ...]`.
+If the auth token is not allowed to query the keyholder a 403 error is returned.
+
+*/status/<claim id>* (GET)  
+Query whether the given claim is still the latest. This is the only request that does not require a token.
+It may return the following values:  
+`unknown` - the claim id is unknown  
+`latest` - the claim is the latest claim for the associated key  
+`outdated` - the claim is no longer the latest for the associated key
+
+*/keyname* (GET)  
+Retrieve the name of the key associated to the used token. If the key is unknown or the token is
+invalid the response is empty.