lncm/invoicer

package common

import (
    "os"
    "os/user"
    "path/filepath"
    "strings"
)

type (
    // This struct defines the structure of the config .toml file
    Config struct {
        // Port invoicer will run on
        Port int64 `toml:"port"`

        // Path to directory where `index.html` will be served from
        StaticDir string `toml:"static-dir"`

        // Location of a log file
        LogFile string `toml:"log-file"`

        // Currently only `lnd` supported
        LnClient string `toml:"ln-client"`

        // Allows for disabling the possibility of on-chain payments.
        OffChainOnly bool `toml:"off-chain-only"`

        // [bitcoind] section in the `--config` file that defines Bitcoind's setup
        Bitcoind Bitcoind `toml:"bitcoind"`

        // [lnd] section in the `--config` file that defines Lnd's setup
        Lnd LndConfig `toml:"lnd"`

        // An optional list of user:password pairs that will get granted access to the /history endpoint
        Users map[string]string `toml:"users"`
    }

    // Bitcoind config
    // NOTE: Keep in mind that this is **not yet encrypted**, so best to keep it _local_
    Bitcoind struct {
        Host string `toml:"host"`
        Port int64  `toml:"port"`
        User string `toml:"user"`
        Pass string `toml:"pass"`
    }

    Macaroons struct {
        // This is needed to generate new invoices
        Invoice string `toml:"invoice"`

        // This is needed to check status of invoices (and if enabled access `/history` endpoint)
        ReadOnly string `toml:"readonly"`
    }

    LndConfig struct {
        Host string `toml:"host"`
        Port int64  `toml:"port"`

        // TLS certificate is usually located in `~/.lnd/tls.cert`
        TLS string `toml:"tls"`

        // Macaroons are usually located in `~/.lnd/data/chain/bitcoin/mainnet/`
        Macaroons Macaroons `toml:"macaroon"`
    }
)

// CleanAndExpandPath converts passed file system paths into absolute ones.
func CleanAndExpandPath(path string) string {
    if path == "" {
        return ""
    }

    // Expand initial ~ to OS specific home directory.
    if strings.HasPrefix(path, "~") {
        var homeDir string

        u, err := user.Current()
        if err == nil {
            homeDir = u.HomeDir
        } else {
            homeDir = os.Getenv("HOME")
        }

        path = strings.Replace(path, "~", homeDir, 1)
    }

    // NOTE: The os.ExpandEnv doesn't work with Windows-style %VARIABLE%,
    // but the variables can still be expanded via POSIX-style $VARIABLE.
    return filepath.Clean(os.ExpandEnv(path))
}