[#166] Fix getting s3 object with the FrostFS OID name

Prioritize getting s3 object with the key, which equals to valid FrostFS OID, rather than getting non-existent object with OID via native protocol for GET and HEAD requests

Signed-off-by: Nikita Zinkevich <n.zinkevich@yadro.com>

internal/handler/download.go

@@ -4,12 +4,14 @@ import (
 	"archive/zip"
 	"bufio"
 	"context"
+	"errors"
 	"fmt"
 	"io"
 	"net/http"
 	"net/url"
 	"time"
 
+	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/layer"
 	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/response"
 	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/utils"
@@ -23,21 +25,46 @@ import (
 
 // DownloadByAddressOrBucketName handles download requests using simple cid/oid or bucketname/key format.
 func (h *Handler) DownloadByAddressOrBucketName(c *fasthttp.RequestCtx) {
-	oidURLParam := c.UserValue("oid").(string)
-	downloadQueryParam := c.QueryArgs().GetBool("download")
+	cidParam := c.UserValue("cid").(string)
+	oidParam := c.UserValue("oid").(string)
+	downloadParam := c.QueryArgs().GetBool("download")
 
-	switch {
-	case isObjectID(oidURLParam):
-		h.byNativeAddress(c, h.receiveFile)
-	case !isContainerRoot(oidURLParam) && (downloadQueryParam || !isDir(oidURLParam)):
-		h.byS3Path(c, h.receiveFile)
-	default:
-		h.browseIndex(c)
+	ctx := utils.GetContextFromRequest(c)
+	log := utils.GetReqLogOrDefault(ctx, h.log).With(
+		zap.String("cid", cidParam),
+		zap.String("oid", oidParam),
+	)
+
+	bktInfo, err := h.getBucketInfo(ctx, cidParam, log)
+	if err != nil {
+		logAndSendBucketError(c, log, err)
+		return
+	}
+
+	checkS3Err := h.tree.CheckSettingsNodeExists(ctx, bktInfo)
+	if checkS3Err != nil && !errors.Is(checkS3Err, layer.ErrNodeNotFound) {
+		logAndSendBucketError(c, log, checkS3Err)
+		return
+	}
+
+	req := h.newRequest(c, log)
+
+	var objID oid.ID
+	if checkS3Err == nil && shouldDownload(oidParam, downloadParam) {
+		h.byS3Path(ctx, req, bktInfo.CID, oidParam, h.receiveFile)
+	} else if err = objID.DecodeString(oidParam); err == nil {
+		h.byNativeAddress(ctx, req, bktInfo.CID, objID, h.receiveFile)
+	} else {
+		h.browseIndex(c, checkS3Err != nil)
 	}
 }
 
-func (h *Handler) newRequest(ctx *fasthttp.RequestCtx, log *zap.Logger) *request {
-	return &request{
+func shouldDownload(oidParam string, downloadParam bool) bool {
+	return !isDir(oidParam) || downloadParam
+}
+
+func (h *Handler) newRequest(ctx *fasthttp.RequestCtx, log *zap.Logger) request {
+	return request{
 		RequestCtx: ctx,
 		log:        log,
 	}