Dice gambling service using LN for payments

Installation

Requirements

• Git
• NodeJS / npm

Procedure

Fetch sources from the git repository:

git clone https://github.com/mably/ln-dice.git

Move into the newly created directory:

cd ln-dice

Fetch the dependencies and build the application by running:

npm install

Execution

Start the back-end server:

node server

Available command-line arguments:

node server --help

  Usage: server [options]

  Options:

    -h, --help                    output usage information
    -V, --version                 output the version number
    -s, --serverport [port]       web server listening port (defaults to 8280)
    -h, --serverhost [host]       web server listening host (defaults to localhost)
    -l, --lndhost [host:port]     RPC lnd host (defaults to localhost:10009)
    -t, --usetls [path]           path to a directory containing key.pem and cert.pem files
    -u, --user [login]            basic authentication login
    -p, --pwd [password]          basic authentication password
    -r, --limituser [login]       basic authentication login for readonly account
    -w, --limitpwd [password]     basic authentication password for readonly account
    -f, --logfile [file path]     path to file where to store the application logs
    -e, --loglevel [level]        level of logs to display (debug, info, warn, error)
    -n, --lndlogfile <file path>  path to lnd log file to send to browser
    -k, --le-email [email]        lets encrypt required contact email

Open your browser at the following address: http://localhost:8280

Enjoy!

Generate lnd certificates compatible with NodeJS gRPC

Beware that lnd autogenerated certificates are not compatible with current NodeJS gRPC module implementation.

Lnd uses the P-521 curve for its certificates but NodeJS gRPC module is only compatible with certificates using the P-256 curve (link).

You need to generate your own lnd certificates using the following commands (thanks to Alex Akselrod for helping me on this):

# Enter the Lnd home directory, located by default at ~/.lnd on Linux or 
# /Users/[username]/Library/Application Support/Lnd/ on Mac OSX
cd ~/.lnd
openssl ecparam -genkey -name prime256v1 -out tls.key
openssl req -new -sha256 -key tls.key -out csr.csr -subj '/CN=localhost/O=lnd'
openssl req -x509 -sha256 -days 3650 -key tls.key -in csr.csr -out tls.cert
rm csr.csr

For some reason the lnd web client must also now be run with root privileges.

You can write a lnd web client start script and add it to your sudoers file until a proper fix is found:

<lnd web client username> ALL=(ALL) NOPASSWD: <lnd web client start script command>

Screenshots

Check here for the mandatory screenshots: http://imgur.com/a/LgWcs

Enabling https for remote access

You need to have a key.pem (private key) file and a cert.pem (certificate) file available in your path (check the --usetls command-line option).

On Linux you can create the above files using a self-signed certificate by executing the following command:

openssl req -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -days 365

You might need to run this extra command to remove the password protection:

openssl rsa -in key.pem -out newkey.pem && mv newkey.pem key.pem

And the you need to add the --usetls command-line option to point to the directory containing your two pem files.

Example command starting a password protected Lnd Web Client with readonly account enabled, running on port 443, and using https with corresponding pem files located in the app directory:

node server -s 443 --usetls . --user manager --pwd 33H966wG --limituser lnd --limitpwd rocks

Hoping that helps.