generate default value for secret so that fathom can run using only default values

.env.example

@@ -1,6 +1,6 @@
-FATHOM_DATABASE_DRIVER=mysql
-FATHOM_DATABASE_NAME="fathom_db"
-FATHOM_DATABASE_USER="root"
-FATHOM_DATABASE_PASSWORD="root"
+FATHOM_DATABASE_DRIVER="sqlite3"
+FATHOM_DATABASE_NAME="./fathom.db"
+FATHOM_DATABASE_USER=""
+FATHOM_DATABASE_PASSWORD=""
 FATHOM_DATABASE_HOST=""
 FATHOM_SECRET="abcdefghijklmnopqrstuvwxyz1234567890"

fathom.go

@@ -1,22 +1,23 @@
 package main
 
 import (
+	"math/rand"
 	"os"
 
 	"github.com/joho/godotenv"
 	"github.com/usefathom/fathom/pkg/commands"
 	"github.com/usefathom/fathom/pkg/counter"
 	"github.com/usefathom/fathom/pkg/datastore"
-	"gopkg.in/alecthomas/kingpin.v2"
 
 	"github.com/kelseyhightower/envconfig"
 	log "github.com/sirupsen/logrus"
+	kingpin "gopkg.in/alecthomas/kingpin.v2"
 )
 
 type Config struct {
 	Database *datastore.Config
 
-	Secret string `required:"true"`
+	Secret string
 }
 
 var (
@@ -31,13 +32,7 @@ var (
 )
 
 func main() {
-	// load .env file
-	var cfg Config
-	godotenv.Load()
-	err := envconfig.Process("Fathom", &cfg)
-	if err != nil {
-		log.Fatalf("Error parsing Fathom config from environment: %s", err)
-	}
+	cfg := parseConfig()
 
 	// setup database connection
 	db := datastore.Init(cfg.Database)
@@ -61,3 +56,29 @@ func main() {
 	}
 
 }
+
+func parseConfig() *Config {
+	var cfg Config
+	godotenv.Load()
+	err := envconfig.Process("Fathom", &cfg)
+	if err != nil {
+		log.Fatalf("Error parsing Fathom config from environment: %s", err)
+	}
+
+	// if secret key is empty, use a randomly generated one to ease first-time installation
+	if cfg.Secret == "" {
+		cfg.Secret = randomString(40)
+		os.Setenv("FATHOM_SECRET", cfg.Secret)
+	}
+
+	return &cfg
+}
+
+func randomString(len int) string {
+	bytes := make([]byte, len)
+	for i := 0; i < len; i++ {
+		bytes[i] = byte(65 + rand.Intn(25)) //A=65 and Z = 65+25
+	}
+
+	return string(bytes)
+}

pkg/datastore/config.go

@@ -7,7 +7,7 @@ type Config struct {
 	Host     string `default:""`
 	User     string `default:""`
 	Password string `default:""`
-	Name     string `default:"fathom"`
+	Name     string `default:"fathom.db"`
 }
 
 func (c *Config) DSN() string {
@@ -19,6 +19,7 @@ func (c *Config) DSN() string {
 	case "mysql":
 		dsn = fmt.Sprintf("%s:%s@%s/%s?parseTime=true&loc=Local", c.User, c.Password, c.Host, c.Name)
 	case "sqlite3", "sqlite":
+
 		dsn = c.Name + "?_loc=auto" // TODO: Make this configurable
 	}