[client] Feature/upload bundle (#3734)

Add an upload bundle option with the flag --upload-bundle; by default, the upload will use a NetBird address, which can be replaced using the flag --upload-bundle-url.

The upload server is available under the /upload-server path. The release change will push a docker image to netbirdio/upload image repository.

The server supports using s3 with pre-signed URL for direct upload and local file for storing bundles.

upload-server/server/s3.go

@@ -0,0 +1,69 @@
+package server
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+	"github.com/aws/aws-sdk-go-v2/config"
+	"github.com/aws/aws-sdk-go-v2/service/s3"
+	log "github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/upload-server/types"
+)
+
+type sThree struct {
+	ctx           context.Context
+	bucket        string
+	presignClient *s3.PresignClient
+}
+
+func configureS3Handlers(mux *http.ServeMux) error {
+	bucket := os.Getenv(bucketVar)
+	region, ok := os.LookupEnv("AWS_REGION")
+	if !ok {
+		return fmt.Errorf("AWS_REGION environment variable is required")
+	}
+	ctx := context.Background()
+	cfg, err := config.LoadDefaultConfig(ctx, config.WithRegion(region))
+	if err != nil {
+		return fmt.Errorf("unable to load SDK config: %w", err)
+	}
+
+	client := s3.NewFromConfig(cfg)
+
+	handler := &sThree{
+		ctx:           ctx,
+		bucket:        bucket,
+		presignClient: s3.NewPresignClient(client),
+	}
+	mux.HandleFunc(types.GetURLPath, handler.handlerGetUploadURL)
+	return nil
+}
+
+func (s *sThree) handlerGetUploadURL(w http.ResponseWriter, r *http.Request) {
+	if !isValidRequest(w, r) {
+		return
+	}
+
+	objectKey := getObjectKey(w, r)
+	if objectKey == "" {
+		return
+	}
+
+	req, err := s.presignClient.PresignPutObject(s.ctx, &s3.PutObjectInput{
+		Bucket: aws.String(s.bucket),
+		Key:    aws.String(objectKey),
+	}, s3.WithPresignExpires(15*time.Minute))
+
+	if err != nil {
+		http.Error(w, "failed to presign URL", http.StatusInternalServerError)
+		log.Errorf("Presign error: %v", err)
+		return
+	}
+
+	respondGetRequest(w, req.URL, objectKey)
+}