Add login endpoint and generate a valid token

server/app/auth.go

@@ -0,0 +1,28 @@
+package app
+
+import (
+	"database/sql"
+	"fmt"
+
+	"git.ctrlz.es/mgdelacroix/craban/utils"
+)
+
+func (a *App) Login(username, password string) (string, error) {
+	user, err := a.store.User().GetByUsername(username)
+	if err == sql.ErrNoRows {
+		return "", nil
+	} else if err != nil {
+		return "", fmt.Errorf("cannot get user by username: %w", err)
+	}
+
+	if !utils.CheckHash(user.Password, password) {
+		return "", nil
+	}
+
+	token, err := utils.GenerateToken(user.ID, *a.config.Secret)
+	if err != nil {
+		return "", fmt.Errorf("cannot generate token: %w", err)
+	}
+
+	return token, nil
+}