✨ feature: integrate SSL mode for PG connections (#77)

Right now, the default connection for postgres is `disable`. Some
databases require `verify` or even `required`.
This PR introduces a new implementation that allows the user to override
the `disable` mode. The PR keeps a backwards compatible config entry, that
sets the default behavior to `disable` if it's missing.

postgres/README.md

@@ -47,6 +47,7 @@ store := postgres.New(postgres.Config{
 	Table:           "fiber_storage",
 	Reset:           false,
 	GCInterval:      10 * time.Second,
+	SslMode:         "disable",
 })
 ```
 
@@ -93,6 +94,11 @@ type Config struct {
 	//
 	// Optional. Default is 10 * time.Second
 	GCInterval time.Duration
+
+	// The SSL mode for the connection
+	//
+	// Optional. Default is "disable"
+	SslMode string
 }
 ```
 
@@ -105,5 +111,6 @@ var ConfigDefault = Config{
 	Table:           "fiber_storage",
 	Reset:           false,
 	GCInterval:      10 * time.Second,
+	SslMode:         "disable",
 }
 ```

postgres/config.go

@@ -36,6 +36,11 @@ type Config struct {
 	// Optional. Default is "fiber_storage"
 	Table string
 
+	// The SSL mode for the connection
+	//
+	// Optional. Default is "disable"
+	SslMode string
+
 	// Reset clears any existing keys in existing Table
 	//
 	// Optional. Default is false
@@ -89,6 +94,7 @@ var ConfigDefault = Config{
 	Port:            5432,
 	Database:        "fiber",
 	Table:           "fiber_storage",
+	SslMode:         "disable",
 	Reset:           false,
 	GCInterval:      10 * time.Second,
 	maxOpenConns:    100,
@@ -119,6 +125,9 @@ func configDefault(config ...Config) Config {
 	if cfg.Table == "" {
 		cfg.Table = ConfigDefault.Table
 	}
+	if cfg.SslMode == "" {
+		cfg.SslMode = ConfigDefault.SslMode
+	}
 	if int(cfg.GCInterval.Seconds()) <= 0 {
 		cfg.GCInterval = ConfigDefault.GCInterval
 	}

postgres/postgres.go

@@ -57,9 +57,10 @@ func New(config ...Config) *Storage {
 		dsn += "@"
 	}
 	dsn += fmt.Sprintf("%s:%d", url.QueryEscape(cfg.Host), cfg.Port)
-	dsn += fmt.Sprintf("/%s?connect_timeout=%d&sslmode=disable",
+	dsn += fmt.Sprintf("/%s?connect_timeout=%d&sslmode=%s",
 		url.QueryEscape(cfg.Database),
 		int64(cfg.timeout.Seconds()),
+		cfg.SslMode,
 	)
 
 	// Create db

postgres/postgres_test.go

@@ -159,6 +159,21 @@ func Test_Postgres_Non_UTF8(t *testing.T) {
 	utils.AssertEqual(t, val, result)
 }
 
+func Test_SslRequiredMode(t *testing.T) {
+	defer func() {
+		if recover() == nil {
+			utils.AssertEqual(t, true, nil, "Connection was established with a `require`")
+		}
+	}()
+	_ = New(Config{
+		Database: "fiber",
+		Username: "username",
+		Password: "password",
+		Reset:    true,
+		SslMode:  "require",
+	})
+}
+
 func Test_Postgres_Close(t *testing.T) {
 	utils.AssertEqual(t, nil, testStore.Close())
 }