added mock s3 implementation

internal/s3/mock.go

@@ -0,0 +1,141 @@
+package s3
+
+import (
+	"bytes"
+	"context"
+	"crypto/md5"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"time"
+
+	"git.kapelle.org/niklas/s3browser/internal/types"
+)
+
+type mockS3 struct {
+	buckets []string
+	objects map[types.ID]mockObject
+}
+
+type mockObject struct {
+	content     []byte
+	contentType string
+	lastMod     time.Time
+}
+
+type mockObjectReader struct {
+	*bytes.Reader
+}
+
+func (r mockObjectReader) Close() error {
+	// NOOP
+	return nil
+}
+
+func NewMockS3(buckets []string) (S3Service, error) {
+	return &mockS3{
+		buckets: buckets,
+		objects: map[types.ID]mockObject{},
+	}, nil
+}
+
+func (m *mockS3) ListBuckets(ctx context.Context) ([]Bucket, error) {
+	var rtn []Bucket
+	for _, v := range m.buckets {
+		rtn = append(rtn, Bucket(v))
+	}
+
+	return rtn, nil
+}
+
+func (m *mockS3) ListObjects(ctx context.Context, id types.ID) ([]types.File, []types.Directory, error) {
+	var files []types.File
+	var dirs []types.Directory
+
+	for k, v := range m.objects {
+		if k.Bucket == id.Bucket {
+			if k.Parent().Key == id.Key {
+				if k.IsDirectory() {
+					dirs = append(dirs, *mockObjToDir(v, k))
+				} else {
+					files = append(files, *mockObjToFile(v, k))
+				}
+			}
+		}
+	}
+
+	return files, dirs, nil
+}
+
+func (m *mockS3) GetObject(ctx context.Context, id types.ID) (Object, error) {
+	mockObj, exist := m.objects[id]
+
+	if !exist {
+		return nil, fmt.Errorf("Object not found")
+	}
+
+	reader := bytes.NewReader(mockObj.content)
+
+	return mockObjectReader{reader}, nil
+}
+
+func (m *mockS3) PutObject(ctx context.Context, id types.ID, reader io.Reader, objectSize int64) error {
+	content, err := ioutil.ReadAll(reader)
+
+	if err != nil {
+		return err
+	}
+
+	m.objects[id] = mockObject{
+		content:     content,
+		lastMod:     time.Now(),
+		contentType: "application/octet-stream", // TODO: detect MIME type or dont its just a mock after all
+	}
+
+	return nil
+}
+
+func (m *mockS3) CopyObject(ctx context.Context, src types.ID, dest types.ID) error {
+	srcObj, exist := m.objects[src]
+
+	if !exist {
+		return fmt.Errorf("Object not found")
+	}
+
+	m.objects[dest] = srcObj
+
+	return nil
+}
+
+func (m *mockS3) StatObject(ctx context.Context, id types.ID) (*types.File, error) {
+	mockObj, exist := m.objects[id]
+
+	if !exist {
+		return nil, fmt.Errorf("Object not found")
+	}
+
+	return mockObjToFile(mockObj, id), nil
+}
+
+func (m *mockS3) RemoveObject(ctx context.Context, id types.ID) error {
+	delete(m.objects, id)
+	return nil
+}
+
+func mockObjToFile(mockObj mockObject, id types.ID) *types.File {
+	return &types.File{
+		ID:           id,
+		Name:         id.Name(),
+		Size:         int64(len(mockObj.content)),
+		ContentType:  mockObj.contentType,
+		LastModified: mockObj.lastMod,
+		ETag:         fmt.Sprintf("%x", md5.Sum(mockObj.content)),
+	}
+}
+
+func mockObjToDir(mockObj mockObject, id types.ID) *types.Directory {
+	return &types.Directory{
+		ID:   id,
+		Name: id.Name(),
+	}
+}