refactor create endpoint

lib/service.go

@@ -2,15 +2,21 @@ package lib
 
 import (
 	"context"
+	"database/sql"
 	"fmt"
+	"math/rand"
 
 	"github.com/getAlby/lndhub.go/db/models"
+	"github.com/getAlby/lndhub.go/lib/security"
 	"github.com/getAlby/lndhub.go/lib/tokens"
+	"github.com/labstack/gommon/random"
 	"github.com/lightningnetwork/lnd/lnrpc"
 	"github.com/uptrace/bun"
 	"golang.org/x/crypto/bcrypt"
 )
 
+const alphaNumBytes = random.Alphanumeric
+
 type LndhubService struct {
 	Config    *Config
 	DB        *bun.DB
@@ -124,3 +130,41 @@ func (svc *LndhubService) Payinvoice(userId int64, invoice string) error {
 	return err
 
 }
+
+func (svc *LndhubService) Create() (user *models.User, err error) {
+
+	user = &models.User{}
+
+	// generate user login/password (TODO: allow the user to choose a login/password?)
+	user.Login = randStringBytes(8)
+	password := randStringBytes(15)
+	// we only store the hashed password but return the initial plain text password in the HTTP response
+	hashedPassword := security.HashPassword(password)
+	user.Password = hashedPassword
+
+	// Create user and the user's accounts
+	// We use double-entry bookkeeping so we use 4 accounts: incoming, current, outgoing and fees
+	// Wrapping this in a transaction in case something fails
+	err = svc.DB.RunInTx(context.TODO(), &sql.TxOptions{}, func(ctx context.Context, tx bun.Tx) error {
+		if _, err := tx.NewInsert().Model(&user).Exec(ctx); err != nil {
+			return err
+		}
+		accountTypes := []string{"incoming", "current", "outgoing", "fees"}
+		for _, accountType := range accountTypes {
+			account := models.Account{UserID: user.ID, Type: accountType}
+			if _, err := svc.DB.NewInsert().Model(&account).Exec(ctx); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+	return user, err
+}
+
+func randStringBytes(n int) string {
+	b := make([]byte, n)
+	for i := range b {
+		b[i] = alphaNumBytes[rand.Intn(len(alphaNumBytes))]
+	}
+	return string(b)
+}