RTL/.github/docs/Application_configurations.md

RTL allows the user to configure and control specific application parameters for app customization and integration.
The parameters can be configured via RTL-Config.json file or through environment variables defined at the OS level. Required
parameters have default values for initial setup and can be updated after RTL server initial start.

RTL-Config.json

{
  "multiPass": "<The password in plain text, default 'password', Required>",
  "port": "<port number for the rtl node server, default '3000', Required>",
  "host": "<host for the rtl node server, default 'all IPs', Optional>",
  "defaultNodeIndex": <Default index to load when rtl server starts, default 1, Optional>,
  "SSO": {
    "rtlSSO": <parameter to turn SSO off/on. Allowed values - 1 (single sign on via an external cookie), 0 (stand alone RTL authentication), default 0, Required>,
    "rtlCookiePath": "<Full path of the cookie file including the file name. The application url needs to pass the value from this cookie file as query param 'access-key' for the SSO authentication to work, Required if SSO=1 else empty (Optional)>",
    "logoutRedirectLink": "<URL to re-direct to after logout/timeout from RTL, Required if SSO=1 else empty (Optional)>"
  },
  "nodes": [
    {
      "index": <Incremental node indices starting from 1, Required>,
      "lnNode": "<Node name to uniquely identify the node in the UI, Default 'Node 1', Required>",
      "lnImplementation": "<LNP implementation, Allowed values LND/CLN/ECL. Default 'LND', Required>",
      "Authentication": {
        "macaroonPath": "<Path for the folder containing 'admin.macaroon' (LND)/'access.macaroon' (CLN) file, Required for LND & CLN>",
        "swapMacaroonPath": "<Path for the folder containing 'loop.macaroon' (LND), Required for LND Loop>",
        "boltzMacaroonPath": "<Path for the folder containing 'admin.macaroon' (Boltz), Required for Boltz Swaps>",
        "configPath": "<Full path of the lnd.conf/core lightning config/eclair.conf file including the file name, if present locally, Optional, only mandatory for ECL if the lnApiPassword is missing>",
        "lnApiPassword": "<Password to be used for ECL API authentication. Mandatory only for ECL if the configPath is missing>"
      },
      "Settings": {
        "userPersona": "<User persona to tailor the data on UI. Allowed values MERCHANT, OPERATOR. Default MERCHANT, Required>",
        "themeMode": "<Theme modes, Allowed values DAY, NIGHT. Default DAY, Required>",
        "themeColor": "<Theme colors, Allowed values PURPLE, TEAL, INDIGO, PINK, YELLOW. Default PURPLE, Required>",
        "channelBackupPath": "<Path to save channel backup file. Only for LND implementation, Default <RTL root>\backup\node-1, Optional>",
        "bitcoindConfigPath": "<Path of bitcoind.conf path if available locally>",
        "logLevel": <logging levels, will log in accordance with the logLevel value provided, Allowed values ERROR, WARN, INFO, DEBUG>,
        "fiatConversion": <parameter to turn fiat conversion off/on. Allowed values - true, false, default false, Required>,
        "currencyUnit": "<Optional: Fiat current Unit for currency conversion, default 'USD' If fiatConversion is true, Required if fiatConversion is true>",
        "unannouncedChannels": <parameter to turn off/on setting for opening announced Channels, default false, Optional>
        "lnServerUrl": "<Service url for LND/Core Lightning REST APIs for the node, e.g. https://192.168.0.1:8080 OR https://192.168.0.1:3001 OR http://192.168.0.1:8080. Default 'https://localhost:8080', Required",
        "swapServerUrl": "<Service url for swap server REST APIs for the node, e.g. https://localhost:8081, Optional>",
        "boltzServerUrl": "<Service url for boltz server REST APIs for the node, e.g. https://localhost:9003, Optional>"
      }
    }
  ]
}

### Environment variables
The environment variable can also be used for all of the above configurations except the UI settings.
If the environment variables are set, it will take precedence over the parameters in the RTL-Config.json file.

PORT (port number for the rtl node server, default 3000, Required)
HOST (host for the rtl node server, default localhost, Optional)
APP_PASSWORD (Plaintext password to be provided by the parent container, NOT suggested for standalone RTL applications, to be used by Umbrel) (Optional)
LN_IMPLEMENTATION (LND/CLN/ECL. Default 'LND', Required)
LN_SERVER_URL (LN server URL for LNP REST APIs, default https://localhost:8080) (Required)
SWAP_SERVER_URL (Swap server URL for REST APIs, default http://localhost:8081) (Optional)
BOLTZ_SERVER_URL (Boltz server URL for REST APIs, default http://localhost:9003) (Optional)
CONFIG_PATH (Full path of the LNP .conf file including the file name) (Optional for LND & CLN, Mandatory for ECL if LN_API_PASSWORD is undefined)
MACAROON_PATH (Path for the folder containing 'admin.macaroon' (LND)/'access.macaroon' (CLN) file, Required for LND & CLN)
SWAP_MACAROON_PATH (Path for the folder containing Loop's 'loop.macaroon', optional)
BOLTZ_MACAROON_PATH (Path for the folder containing Boltz's 'admin.macaroon', optional)
RTL_SSO (1 - single sign on via an external cookie, 0 - stand alone RTL authentication, Required)
RTL_COOKIE_PATH (Full path of the cookie file including the file name, Required if RTL_SSO=1 else Optional)
LOGOUT_REDIRECT_LINK (URL to re-direct to after logout/timeout from RTL, Required if RTL_SSO=1 else Optional)
RTL_CONFIG_PATH (Path for the folder containing 'RTL-Config.json' file, Required)
BITCOIND_CONFIG_PATH (Full path of the bitcoind.conf file including the file name, Optional)
CHANNEL_BACKUP_PATH (Folder location for saving the channel backup files, valid for LND implementation only, Required if ln implementation=LND else Optional)
ENABLE_OFFERS (Boolean flag to enable the offers feature on core lighning, default false, optional)
ENABLE_PEERSWAP (Boolean flag to enable the peerswap feature on core lighning, default false, optional)
LN_API_PASSWORD (Password for Eclair implementation if the eclair.conf path is not available, Required if ln implementation=ECL && config path is undefined)