Add .env file support

.env.template

@@ -0,0 +1,13 @@
+# Cryptographic key for generating secure CSRF protection tokens
+LENSLOCKED_CSRF_KEY=
+
+# Postgresql DB c nnection settings
+# Make sure to enable ssl when deploying to production
+LENSLOCKED_DB_STRING="host=localhost port=5432 user=changeme dbname=lenslocked sslmode=disable"
+
+# SMTP Email settings
+LENSLOCKED_EMAIL_HOST=
+LENSLOCKED_EMAIL_PORT=
+LENSLOCKED_EMAIL_USERNAME=
+LENSLOCKED_EMAIL_PASSWORD=
+LENSLOCKED_EMAIL_FROM=

go.mod

@@ -20,6 +20,7 @@ require (
 	github.com/jackc/pgproto3/v2 v2.3.3 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
 	github.com/jackc/pgtype v1.14.0 // indirect
+	github.com/joho/godotenv v1.5.1 // indirect
 	github.com/mfridman/interpolate v0.0.2 // indirect
 	github.com/sethvargo/go-retry v0.2.4 // indirect
 	go.uber.org/multierr v1.11.0 // indirect

go.sum

@@ -78,6 +78,8 @@ github.com/jackc/pgx/v4 v4.18.3/go.mod h1:Ey4Oru5tH5sB6tV7hDmfWFahwF15Eb7DNXlRKx
 github.com/jackc/puddle v0.0.0-20190413234325-e4ced69a3a2b/go.mod h1:m4B5Dj62Y0fbyuIc15OsIqK0+JU8nkqQjsgx7dvjSWk=
 github.com/jackc/puddle v0.0.0-20190608224051-11cab39313c9/go.mod h1:m4B5Dj62Y0fbyuIc15OsIqK0+JU8nkqQjsgx7dvjSWk=
 github.com/jackc/puddle v1.1.3/go.mod h1:m4B5Dj62Y0fbyuIc15OsIqK0+JU8nkqQjsgx7dvjSWk=
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/konsorten/go-windows-terminal-sequences v1.0.2/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=

main.go

@@ -6,6 +6,7 @@ import (
 	"io/fs"
 	"net/http"
 	"os"
+	"strconv"
 
 	userctx "git.kealoha.me/lks/lenslocked/context"
 	ctrlrs "git.kealoha.me/lks/lenslocked/controllers"
@@ -13,6 +14,7 @@ import (
 	"git.kealoha.me/lks/lenslocked/models"
 	"github.com/go-chi/chi/v5"
 	"github.com/gorilla/csrf"
+	"github.com/joho/godotenv"
 	"github.com/pressly/goose/v3"
 
 	"github.com/go-chi/chi/v5/middleware"
@@ -53,20 +55,38 @@ func MigrateDB(db *sql.DB, subfs fs.FS) error {
 }
 
 func main() {
-	csrfKey := []byte(os.Getenv("LENSLOCKED_CSRF_KEY"))
+	err := godotenv.Load()
+	if err != nil {
+		fmt.Println("Warning: Could not load .env file")
+	}
+
+	var (
+		email_host     = os.Getenv("LENSLOCKED_EMAIL_HOST")
+		email_port_str = os.Getenv("LENSLOCKED_EMAIL_PORT")
+		email_username = os.Getenv("LENSLOCKED_EMAIL_USERNAME")
+		email_pass     = os.Getenv("LENSLOCKED_EMAIL_PASSWORD")
+		email_sender   = os.Getenv("LENSLOCKED_EMAIL_FROM")
+		csrfKey        = []byte(os.Getenv("LENSLOCKED_CSRF_KEY"))
+	)
 	if len(csrfKey) < 32 {
-		panic("Error: bad csrf protection key\nPlease set a key with the LENSLOCKED_CSRF_KEY env var.")
+		panic("Error: no or bad csrf protection key\nPlease set the LENSLOCKED_CSRF_KEY env var to a key at least 32 characters long.")
+	}
+	email_port, err := strconv.Atoi(email_port_str)
+	if err != nil {
+		fmt.Println("Warning: Invalid STMP port set in LENSLOCKED_EMAIL_PORT. Using port 587")
+		email_port = 587
 	}
 
 	db := ConnectDB()
 	defer db.Close()
-	err := MigrateDB(db, migrations.FS)
+	err = MigrateDB(db, migrations.FS)
 	if err != nil {
 		panic(err)
 	}
 
 	userService := models.UserService{DB: db}
 	sessionService := models.SessionService{DB: db}
+	_ = models.NewEmailService(email_host, email_port, email_username, email_pass, email_sender)
 	var usersCtrlr ctrlrs.Users = ctrlrs.Default(&userService, &sessionService)
 
 	umw := userctx.UserMiddleware{SS: &sessionService}

models/email.go

@@ -2,15 +2,10 @@ package models
 
 import (
 	"fmt"
-	"os"
 
 	"github.com/go-mail/mail/v2"
 )
 
-var (
-	defaultSender = os.Getenv("LENSLOCKED_EMAIL_FROM")
-)
-
 type Email struct {
 	To      string
 	Subject string