feat: s3 server support (#6088 close #5186)

Currently tested: List, Get, Remove

server/s3/server.go

@@ -0,0 +1,27 @@
+// Credits: https://pkg.go.dev/github.com/rclone/rclone@v1.65.2/cmd/serve/s3
+// Package s3 implements a fake s3 server for alist
+package s3
+
+import (
+	"context"
+	"math/rand"
+	"net/http"
+
+	"github.com/Mikubill/gofakes3"
+)
+
+// Make a new S3 Server to serve the remote
+func NewServer(ctx context.Context, authpair []string) (h http.Handler, err error) {
+	var newLogger logger
+	faker := gofakes3.New(
+		newBackend(),
+		// gofakes3.WithHostBucket(!opt.pathBucketMode),
+		gofakes3.WithLogger(newLogger),
+		gofakes3.WithRequestID(rand.Uint64()),
+		gofakes3.WithoutVersioning(),
+		gofakes3.WithV4Auth(authlistResolver(authpair)),
+		gofakes3.WithIntegrityCheck(true), // Check Content-MD5 if supplied
+	)
+
+	return faker.Server(), nil
+}