[poc] replaced aws-sdk-go-v2 and gocloud.dev/blob

tools/filesystem/internal/s3blob/s3/get_object.go

@@ -0,0 +1,43 @@
+package s3
+
+import (
+	"context"
+	"io"
+	"net/http"
+)
+
+// https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObject.html#API_GetObject_ResponseElements
+type GetObjectResponse struct {
+	Body io.ReadCloser `json:"-" xml:"-"`
+
+	HeadObjectResponse
+}
+
+// GetObject retrieves a single object by its key.
+//
+// NB! Make sure to call GetObjectResponse.Body.Close() after done working with the result.
+//
+// https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObject.html
+func (s3 *S3) GetObject(ctx context.Context, key string, optFuncs ...func(*http.Request)) (*GetObjectResponse, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, s3.URL(key), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// apply optional request funcs
+	for _, fn := range optFuncs {
+		if fn != nil {
+			fn(req)
+		}
+	}
+
+	resp, err := s3.SignAndSend(req)
+	if err != nil {
+		return nil, err
+	}
+
+	result := &GetObjectResponse{Body: resp.Body}
+	result.load(resp.Header)
+
+	return result, nil
+}