Initial backend import

internal/handlers/context.go

@@ -0,0 +1,40 @@
+package handlers
+
+import (
+	"context"
+	"net/http"
+	"strconv"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+)
+
+type ctxKey string
+
+const poolKey ctxKey = "pgpool"
+
+func WithPool(next http.Handler, pool *pgxpool.Pool) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		ctx := context.WithValue(r.Context(), poolKey, pool)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+func poolFrom(r *http.Request) *pgxpool.Pool {
+	return r.Context().Value(poolKey).(*pgxpool.Pool)
+}
+
+func parsePage(r *http.Request) (page, limit int) {
+	page = 1
+	limit = 20
+	if v := r.URL.Query().Get("page"); v != "" {
+		if n, err := strconv.Atoi(v); err == nil && n > 0 {
+			page = n
+		}
+	}
+	if v := r.URL.Query().Get("limit"); v != "" {
+		if n, err := strconv.Atoi(v); err == nil && n > 0 && n <= 100 {
+			limit = n
+		}
+	}
+	return page, limit
+}