Add session management with PostgreSQL storage and utility functions

7 files changed, 231 insertions, 20 deletions

diff --git a/config/config.go b/config/config.go
index 293a135..41b0f5a 100644
--- a/config/config.go
+++ b/config/config.go
@@ -10,6 +10,7 @@ import (
 var (
 	Server   server
 	Database database
+	Session  session
 )
 
 func init() {
@@ -24,4 +25,8 @@ func init() {
 	if err := env.Parse(&Database); err != nil {
 		log.Fatalf("Failed to parse DatabaseConfig: %v", err)
 	}
+
+	if err := env.Parse(&Session); err != nil {
+		log.Fatalf("Failed to parse SessionConfig: %v", err)
+	}
 }
diff --git a/config/env.go b/config/env.go
index dd9eb70..760bb3d 100644
--- a/config/env.go
+++ b/config/env.go
@@ -1,5 +1,7 @@
 package config
 
+import "time"
+
 type server struct {
 	Host           string `env:"SERVER_HOST" default:"localhost"`
 	Port           int    `env:"SERVER_PORT" default:"8080"`
@@ -17,3 +19,12 @@ type database struct {
 	Name     string `env:"DB_NAME" default:"cafe"`
 	SSLMode  string `env:"DB_SSLMODE" default:"disable"`
 }
+
+type session struct {
+	CookieDomain   string        `env:"SESSION_COOKIE_DOMAIN" default:"localhost"`
+	CookieName     string        `env:"SESSION_COOKIE_NAME" default:"cafe_session"`
+	CookiePath     string        `env:"SESSION_COOKIE_PATH" default:"/"`
+	CookieSameSite string        `env:"SESSION_COOKIE_SAME_SITE" default:"Lax"`
+	CookieSecure   bool          `env:"SESSION_SECURE_COOKIE" default:"false"`
+	CookieTimeout  time.Duration `env:"SESSION_TIMEOUT" default:"24h"`
+}
diff --git a/go.mod b/go.mod
index d99cfbf..70335e5 100644
--- a/go.mod
+++ b/go.mod
@@ -5,6 +5,7 @@ go 1.25.5
 require (
 	github.com/flosch/pongo2/v6 v6.0.0
 	github.com/gofiber/fiber/v2 v2.52.10
+	github.com/gofiber/storage/postgres/v3 v3.3.1
 	github.com/gofiber/template/django/v3 v3.1.14
 	github.com/joho/godotenv v1.5.1
 	gorm.io/driver/postgres v1.6.0
@@ -18,11 +19,11 @@ require (
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
-	github.com/jackc/pgx/v5 v5.6.0 // indirect
+	github.com/jackc/pgx/v5 v5.7.6 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
-	github.com/klauspost/compress v1.17.9 // indirect
+	github.com/klauspost/compress v1.18.1 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mattn/go-runewidth v0.0.16 // indirect
@@ -31,8 +32,8 @@ require (
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	github.com/valyala/fasthttp v1.51.0 // indirect
 	github.com/valyala/tcplisten v1.0.0 // indirect
-	golang.org/x/crypto v0.31.0 // indirect
-	golang.org/x/sync v0.10.0 // indirect
-	golang.org/x/sys v0.28.0 // indirect
-	golang.org/x/text v0.21.0 // indirect
+	golang.org/x/crypto v0.45.0 // indirect
+	golang.org/x/sync v0.18.0 // indirect
+	golang.org/x/sys v0.38.0 // indirect
+	golang.org/x/text v0.31.0 // indirect
 )
diff --git a/go.sum b/go.sum
index fc5a9f7..3bae5ad 100644
--- a/go.sum
+++ b/go.sum
@@ -1,12 +1,50 @@
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+github.com/gofiber/storage/postgres/v3 v3.3.1 h1:W/Z88/o63O6VIYztcMF6yLPzVV6iFv4PLRghFpK0WNE=
+github.com/gofiber/storage/postgres/v3 v3.3.1/go.mod h1:JTspuhSuWCrR5pWdULaAyez0zKSfRz/jKzd4cSWz004=
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@@ -19,8 +57,8 @@ github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsI
 github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
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 github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM=
-github.com/jackc/pgx/v5 v5.6.0 h1:SWJzexBzPL5jb0GEsrPMLIsi/3jOo7RHlzTjcAeDrPY=
-github.com/jackc/pgx/v5 v5.6.0/go.mod h1:DNZ/vlrUnhWCoFGxHAG8U2ljioxukquj7utPDgtQdTw=
+github.com/jackc/pgx/v5 v5.7.6 h1:rWQc5FwZSPX58r1OQmkuaNicxdmExaEz5A2DO2hUuTk=
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@@ -29,12 +67,16 @@ github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
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-github.com/klauspost/compress v1.17.9 h1:6KIumPrER1LHsvBVuDa0r5xaG0Es51mhhB9BQB2qeMA=
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@@ -42,33 +84,81 @@ github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWE
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diff --git a/session/functions.go b/session/functions.go
new file mode 100644
index 0000000..286ebbb
--- /dev/null
+++ b/session/functions.go
@@ -0,0 +1,27 @@
+package session
+
+import "github.com/gofiber/fiber/v2"
+
+const userIDKey = "user_id"
+
+func CreateSession(ctx *fiber.Ctx, userID uint) error {
+	return Set(ctx, userIDKey, userID)
+}
+
+func DestroySession(ctx *fiber.Ctx) error {
+	return Delete(ctx, userIDKey)
+}
+
+func GetSessionUserID(ctx *fiber.Ctx) (uint, error) {
+	value, err := Get(ctx, userIDKey)
+	if err != nil || value == nil {
+		return 0, err
+	}
+
+	userID, ok := value.(uint)
+	if !ok {
+		return 0, nil
+	}
+
+	return userID, nil
+}
diff --git a/session/kv.go b/session/kv.go
new file mode 100644
index 0000000..eecd4c5
--- /dev/null
+++ b/session/kv.go
@@ -0,0 +1,32 @@
+package session
+
+import "github.com/gofiber/fiber/v2"
+
+func Set(ctx *fiber.Ctx, key string, value any) error {
+	sess, err := Store.Get(ctx)
+	if err != nil {
+		return err
+	}
+
+	sess.Set(key, value)
+	return sess.Save()
+}
+
+func Get(ctx *fiber.Ctx, key string) (any, error) {
+	sess, err := Store.Get(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	return sess.Get(key), nil
+}
+
+func Delete(ctx *fiber.Ctx, key string) error {
+	sess, err := Store.Get(ctx)
+	if err != nil {
+		return err
+	}
+
+	sess.Delete(key)
+	return sess.Save()
+}
diff --git a/session/session.go b/session/session.go
new file mode 100644
index 0000000..4a4e0b8
--- /dev/null
+++ b/session/session.go
@@ -0,0 +1,45 @@
+package session
+
+import (
+	"cafe/config"
+	"encoding/gob"
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/gofiber/fiber/v2"
+	"github.com/gofiber/fiber/v2/middleware/session"
+	"github.com/gofiber/storage/postgres/v3"
+)
+
+var Store *session.Store
+
+func init() {
+	gob.Register(fiber.Map{})
+	log.Println("gob: registered fiber.Map for session storage")
+
+	storage := postgres.New(postgres.Config{
+		Host:       config.Database.Host,
+		Port:       config.Database.Port,
+		Username:   config.Database.Username,
+		Password:   config.Database.Password,
+		Database:   config.Database.Name,
+		Table:      config.Session.CookieName,
+		Reset:      false,
+		SSLMode:    config.Database.SSLMode,
+		GCInterval: 10 * time.Second,
+	})
+
+	Store = session.New(session.Config{
+		Storage:        storage,
+		Expiration:     config.Session.CookieTimeout,
+		KeyLookup:      fmt.Sprintf("cookie:%s", config.Session.CookieName),
+		CookieDomain:   config.Session.CookieDomain,
+		CookiePath:     config.Session.CookiePath,
+		CookieSecure:   config.Session.CookieSecure,
+		CookieSameSite: config.Session.CookieSameSite,
+		CookieHTTPOnly: true,
+	})
+
+	log.Println("session storage initialized")
+}