feat: add qpdf engine (#380)

Co-authored-by: Andrei Regiani <andrei.cpp@gmail.com>

pkg/modules/qpdf/qpdf_test.go

@@ -0,0 +1,152 @@
+package qpdf
+
+import (
+	"context"
+	"errors"
+	"os"
+	"reflect"
+	"testing"
+
+	"github.com/gotenberg/gotenberg/v7/pkg/gotenberg"
+	"go.uber.org/zap"
+)
+
+func TestQPDF_Descriptor(t *testing.T) {
+	descriptor := QPDF{}.Descriptor()
+
+	actual := reflect.TypeOf(descriptor.New())
+	expect := reflect.TypeOf(new(QPDF))
+
+	if actual != expect {
+		t.Errorf("expected '%s' but got '%s'", expect, actual)
+	}
+}
+
+func TestQPDF_Provision(t *testing.T) {
+	mod := new(QPDF)
+	ctx := gotenberg.NewContext(gotenberg.ParsedFlags{}, nil)
+
+	err := mod.Provision(ctx)
+	if err != nil {
+		t.Errorf("expected no error but got: %v", err)
+	}
+}
+
+func TestQPDF_Validate(t *testing.T) {
+	for i, tc := range []struct {
+		binPath   string
+		expectErr bool
+	}{
+		{
+			expectErr: true,
+		},
+		{
+			binPath:   "/foo",
+			expectErr: true,
+		},
+		{
+			binPath: os.Getenv("QPDF_BIN_PATH"),
+		},
+	} {
+		mod := new(QPDF)
+		mod.binPath = tc.binPath
+		err := mod.Validate()
+
+		if tc.expectErr && err == nil {
+			t.Errorf("test %d: expected error but got: %v", i, err)
+		}
+
+		if !tc.expectErr && err != nil {
+			t.Errorf("test %d: expected no error but got: %v", i, err)
+		}
+	}
+}
+
+func TestQPDF_Metrics(t *testing.T) {
+	metrics, err := new(QPDF).Metrics()
+	if err != nil {
+		t.Errorf("expected no error but got: %v", err)
+	}
+
+	if len(metrics) != 1 {
+		t.Errorf("expected %d metrics, but got %d", 1, len(metrics))
+	}
+
+	actual := metrics[0].Read()
+	if actual != 0 {
+		t.Errorf("expected %d QPDF instances, but got %f", 0, actual)
+	}
+}
+
+func TestQPDF_Merge(t *testing.T) {
+	for i, tc := range []struct {
+		ctx        context.Context
+		inputPaths []string
+		expectErr  bool
+	}{
+		{
+			ctx: context.TODO(),
+			inputPaths: []string{
+				"/tests/test/testdata/pdfengines/sample1.pdf",
+			},
+		},
+		{
+			ctx: context.TODO(),
+			inputPaths: []string{
+				"/tests/test/testdata/pdfengines/sample1.pdf",
+				"/tests/test/testdata/pdfengines/sample2.pdf",
+			},
+		},
+		{
+			ctx:       nil,
+			expectErr: true,
+		},
+		{
+			ctx: context.TODO(),
+			inputPaths: []string{
+				"foo",
+			},
+			expectErr: true,
+		},
+	} {
+		func() {
+			mod := new(QPDF)
+
+			err := mod.Provision(nil)
+			if err != nil {
+				t.Fatalf("test %d: expected error but got: %v", i, err)
+			}
+
+			outputDir, err := gotenberg.MkdirAll()
+			if err != nil {
+				t.Fatalf("test %d: expected error but got: %v", i, err)
+			}
+
+			defer func() {
+				err := os.RemoveAll(outputDir)
+				if err != nil {
+					t.Fatalf("test %d: expected no error but got: %v", i, err)
+				}
+			}()
+
+			err = mod.Merge(tc.ctx, zap.NewNop(), tc.inputPaths, outputDir+"/foo.pdf")
+
+			if tc.expectErr && err == nil {
+				t.Errorf("test %d: expected error but got: %v", i, err)
+			}
+
+			if !tc.expectErr && err != nil {
+				t.Errorf("test %d: expected no error but got: %v", i, err)
+			}
+		}()
+	}
+}
+
+func TestQPDF_Convert(t *testing.T) {
+	mod := new(QPDF)
+	err := mod.Convert(context.TODO(), zap.NewNop(), "", "", "")
+
+	if !errors.Is(err, gotenberg.ErrPDFEngineMethodNotAvailable) {
+		t.Errorf("expected error %v, but got: %v", gotenberg.ErrPDFEngineMethodNotAvailable, err)
+	}
+}