storage/blob: Implement S3-compatible storage support

Closes #304.

internal/storage/blob/s3/s3_test.go

@@ -0,0 +1,71 @@
+package s3
+
+import (
+	"net/http/httptest"
+	"testing"
+
+	"github.com/foxcpp/maddy/framework/config"
+	"github.com/foxcpp/maddy/framework/module"
+	"github.com/foxcpp/maddy/internal/storage/blob"
+	"github.com/johannesboyne/gofakes3"
+	"github.com/johannesboyne/gofakes3/backend/s3mem"
+)
+
+func TestFS(t *testing.T) {
+	var (
+		backend gofakes3.Backend
+		faker   *gofakes3.GoFakeS3
+		ts      *httptest.Server
+	)
+
+	blob.TestStore(t, func() module.BlobStore {
+		backend = s3mem.New()
+		faker = gofakes3.New(backend)
+		ts = httptest.NewServer(faker.Server())
+
+		if err := backend.CreateBucket("maddy-test"); err != nil {
+			panic(err)
+		}
+
+		st := &Store{instName: "test"}
+		err := st.Init(config.NewMap(map[string]interface{}{}, config.Node{
+			Children: []config.Node{
+				{
+					Name: "endpoint",
+					Args: []string{ts.Listener.Addr().String()},
+				},
+				{
+					Name: "secure",
+					Args: []string{"false"},
+				},
+				{
+					Name: "access_key",
+					Args: []string{"access-key"},
+				},
+				{
+					Name: "secret_key",
+					Args: []string{"secret-key"},
+				},
+				{
+					Name: "bucket",
+					Args: []string{"maddy-test"},
+				},
+			},
+		}))
+		if err != nil {
+			panic(err)
+		}
+
+		return st
+	}, func(store module.BlobStore) {
+		ts.Close()
+
+		backend = s3mem.New()
+		faker = gofakes3.New(backend)
+		ts = httptest.NewServer(faker.Server())
+	})
+
+	if ts != nil {
+		ts.Close()
+	}
+}