Compatible with negative page number and size

api/src/main/java/run/halo/app/extension/PageRequestImpl.java

@@ -13,8 +13,12 @@ public class PageRequestImpl implements PageRequest {
 
     public PageRequestImpl(int pageNumber, int pageSize, Sort sort) {
         Assert.notNull(sort, "Sort must not be null");
-        Assert.isTrue(pageNumber >= 0, "Page index must not be less than zero!");
-        Assert.isTrue(pageSize >= 0, "Page size must not be less than one!");
+        if (pageNumber < 1) {
+            pageNumber = 1;
+        }
+        if (pageSize < 0) {
+            pageSize = 0;
+        }
         this.pageNumber = pageNumber;
         this.pageSize = pageSize;
         this.sort = sort;

api/src/test/java/run/halo/app/extension/PageRequestImplTest.java

@@ -0,0 +1,27 @@
+package run.halo.app.extension;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.Random;
+import org.junit.jupiter.api.RepeatedTest;
+import org.springframework.data.domain.Sort;
+
+class PageRequestImplTest {
+
+    @RepeatedTest(10)
+    void shouldBeCompatibleZeroAndNegativePageNumber() {
+        var randomPageNumber = -(new Random().nextInt(0, Integer.MAX_VALUE));
+        var page = new PageRequestImpl(randomPageNumber, 10, Sort.unsorted());
+        assertEquals(1, page.getPageNumber());
+        assertEquals(10, page.getPageSize());
+    }
+
+    @RepeatedTest(10)
+    void shouldBeCompatibleNegativePageSize() {
+        var randomPageSize = -(new Random().nextInt(1, Integer.MAX_VALUE));
+        var page = new PageRequestImpl(10, randomPageSize, Sort.unsorted());
+        assertEquals(10, page.getPageNumber());
+        assertEquals(0, page.getPageSize());
+    }
+
+}