Support docMDP level 3 validation

DEVSIX-8344

Autoported commit.
Original commit hash: [03a2c75fa]

itext.tests/itext.sign.tests/itext/signatures/validation/v1/DocumentRevisionsValidatorIntegrationTest.cs

@@ -23,6 +23,7 @@ You should have received a copy of the GNU Affero General Public License
 using System;
 using iText.Bouncycastleconnector;
 using iText.Commons.Bouncycastle;
+using iText.Commons.Utils;
 using iText.Kernel.Pdf;
 using iText.Signatures;
 using iText.Signatures.Validation.V1.Report;
@@ -288,5 +289,61 @@ public virtual void RemovedLockedFieldTest() {
                     .INVALID)));
             }
         }
+
+        [NUnit.Framework.Test]
+        public virtual void DanglingWidgetAnnotationTest() {
+            using (PdfDocument document = new PdfDocument(new PdfReader(SOURCE_FOLDER + "danglingWidgetAnnotation.pdf"
+                ))) {
+                DocumentRevisionsValidator validator = new DocumentRevisionsValidator(document);
+                ValidationReport report = validator.ValidateAllDocumentRevisions();
+                // New widget annotation not included into the acroform was added to the 1st page.
+                AssertValidationReport.AssertThat(report, (a) => a.HasStatus(ValidationReport.ValidationResult.INVALID).HasNumberOfFailures
+                    (1).HasNumberOfLogs(1).HasLogItem((l) => l.WithCheckName(DocumentRevisionsValidator.DOC_MDP_CHECK).WithMessage
+                    (DocumentRevisionsValidator.PAGE_ANNOTATIONS_MODIFIED).WithStatus(ReportItem.ReportItemStatus.INVALID)
+                    ));
+                NUnit.Framework.Assert.AreEqual(AccessPermissions.FORM_FIELDS_MODIFICATION, validator.GetAccessPermissions
+                    ());
+            }
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void RemoveAllThePageAnnotationsTest() {
+            using (PdfDocument document = new PdfDocument(new PdfReader(SOURCE_FOLDER + "removeAllAnnots.pdf"))) {
+                DocumentRevisionsValidator validator = new DocumentRevisionsValidator(document);
+                ValidationReport report = validator.ValidateAllDocumentRevisions();
+                // All the annotations on the 2nd page were removed.
+                AssertValidationReport.AssertThat(report, (a) => a.HasStatus(ValidationReport.ValidationResult.VALID));
+                NUnit.Framework.Assert.AreEqual(AccessPermissions.ANNOTATION_MODIFICATION, validator.GetAccessPermissions(
+                    ));
+            }
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void RemoveAllTheFieldAnnotationsTest() {
+            using (PdfDocument document = new PdfDocument(new PdfReader(SOURCE_FOLDER + "removeFieldAnnots.pdf"))) {
+                DocumentRevisionsValidator validator = new DocumentRevisionsValidator(document);
+                ValidationReport report = validator.ValidateAllDocumentRevisions();
+                // All the annotations of the text field were removed. Note that Acrobat considers it invalid.
+                AssertValidationReport.AssertThat(report, (a) => a.HasStatus(ValidationReport.ValidationResult.VALID));
+                NUnit.Framework.Assert.AreEqual(AccessPermissions.ANNOTATION_MODIFICATION, validator.GetAccessPermissions(
+                    ));
+            }
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void RemoveUnnamedFieldTest() {
+            using (PdfDocument document = new PdfDocument(new PdfReader(SOURCE_FOLDER + "removeUnnamedField.pdf"))) {
+                DocumentRevisionsValidator validator = new DocumentRevisionsValidator(document);
+                ValidationReport report = validator.ValidateAllDocumentRevisions();
+                // Child field was removed, so parent field was modified. Both fields are unnamed.
+                AssertValidationReport.AssertThat(report, (a) => a.HasStatus(ValidationReport.ValidationResult.INVALID).HasNumberOfFailures
+                    (3).HasNumberOfLogs(3).HasLogItems(2, 2, (l) => l.WithCheckName(DocumentRevisionsValidator.DOC_MDP_CHECK
+                    ).WithMessage(MessageFormatUtil.Format(DocumentRevisionsValidator.FIELD_REMOVED, "")).WithStatus(ReportItem.ReportItemStatus
+                    .INVALID)).HasLogItem((l) => l.WithCheckName(DocumentRevisionsValidator.DOC_MDP_CHECK).WithMessage(DocumentRevisionsValidator
+                    .NOT_ALLOWED_ACROFORM_CHANGES).WithStatus(ReportItem.ReportItemStatus.INVALID)));
+                NUnit.Framework.Assert.AreEqual(AccessPermissions.ANNOTATION_MODIFICATION, validator.GetAccessPermissions(
+                    ));
+            }
+        }
     }
 }

itext.tests/itext.sign.tests/itext/signatures/validation/v1/DocumentRevisionsValidatorTest.cs

@@ -448,5 +448,26 @@ public virtual void ModifyPageAnnotsTest() {
                     .INVALID)));
             }
         }
+
+        [NUnit.Framework.Test]
+        public virtual void MultipleRevisionsDocumentLevel3Test() {
+            using (PdfDocument document = new PdfDocument(new PdfReader(SOURCE_FOLDER + "multipleRevisionsDocument3.pdf"
+                ))) {
+                DocumentRevisionsValidator validator = new DocumentRevisionsValidator(document);
+                validator.SetAccessPermissions(AccessPermissions.ANNOTATION_MODIFICATION);
+                PdfRevisionsReader revisionsReader = new PdfRevisionsReader(document.GetReader());
+                IList<DocumentRevision> documentRevisions = revisionsReader.GetAllRevisions();
+                ValidationReport validationReport = new ValidationReport();
+                validator.ValidateRevision(documentRevisions[0], documentRevisions[1], validationReport);
+                // Between these two revisions annotations were added and deleted, text field was filled-in.
+                AssertValidationReport.AssertThat(validationReport, (a) => a.HasStatus(ValidationReport.ValidationResult.VALID
+                    ).HasNumberOfFailures(0).HasNumberOfLogs(0));
+                validationReport = new ValidationReport();
+                validator.ValidateRevision(documentRevisions[1], documentRevisions[2], validationReport);
+                // Between these two revisions existed annotations were modified, it is allowed.
+                AssertValidationReport.AssertThat(validationReport, (a) => a.HasStatus(ValidationReport.ValidationResult.VALID
+                    ).HasNumberOfFailures(0).HasNumberOfLogs(0));
+            }
+        }
     }
 }