add cookie based preferences

2 files changed, 77 insertions, 0 deletions

diff --git a/processors/preferences.go b/processors/preferences.go
new file mode 100644
index 0000000..a96d1cb
--- /dev/null
+++ b/processors/preferences.go
@@ -0,0 +1,76 @@
+package processors
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+type SitePreferences struct {
+	SidebarWidth     string `json:"sidebar_width"`
+	MainContentWidth string `json:"main_content_width"`
+	H1FontSize       string `json:"h1_font_size"`
+	BodyFontSize     string `json:"body_font_size"`
+	SmallFontSize    string `json:"small_font_size"`
+	PostsPerPage     int    `json:"posts_per_page"`
+}
+
+func PreferencesContextProcessor(context *fiber.Ctx) error {
+	defaultPreferences := SitePreferences{
+		SidebarWidth:     "180px",
+		MainContentWidth: "1200px",
+		H1FontSize:       "16px",
+		BodyFontSize:     "13px",
+		SmallFontSize:    "11px",
+		PostsPerPage:     42,
+	}
+
+	preferences := defaultPreferences
+
+	preferencesCookie := context.Cookies("preferences")
+	if preferencesCookie != "" {
+		_ = json.Unmarshal([]byte(preferencesCookie), &preferences)
+	}
+
+	bytes, err := json.Marshal(preferences)
+	if err == nil {
+		context.Cookie(&fiber.Cookie{
+			Name:     "preferences",
+			Value:    string(bytes),
+			Path:     "/",
+			SameSite: fiber.CookieSameSiteLaxMode,
+		})
+	}
+
+	context.Locals("Preferences", preferences)
+	context.Locals("PreferencesCSS", preferencesToCSS(preferences))
+	return context.Next()
+}
+
+func preferencesToCSS(preferences SitePreferences) string {
+	return fmt.Sprintf(`
+	<style>
+		main {
+			width: %s;
+		}
+		body {
+			font-size: %s;
+		}
+		h1 {
+			font-size: %s;
+		}
+		small {
+			font-size: %s;
+		}
+		.sidebar {
+			width: %s;
+		}
+	</style>`,
+		preferences.MainContentWidth,
+		preferences.BodyFontSize,
+		preferences.H1FontSize,
+		preferences.SmallFontSize,
+		preferences.SidebarWidth,
+	)
+}
diff --git a/processors/processors.go b/processors/processors.go
index e060abe..bbd23fe 100644
--- a/processors/processors.go
+++ b/processors/processors.go
@@ -6,4 +6,5 @@ func Initialize(app *fiber.App) {
 	app.Use(RequestContextProcessor)

 	app.Use(MetaContextProcessor)

 	app.Use(SidebarContextProcessor)

+	app.Use(PreferencesContextProcessor)

 }