[#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/head.go

@@ -2,11 +2,13 @@ package handler
 
 import (
 	"context"
+	"errors"
 	"io"
 	"net/http"
 	"strconv"
 	"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/utils"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
@@ -102,14 +104,36 @@ func idsToResponse(resp *fasthttp.Response, obj *object.Object) {
 
 // HeadByAddressOrBucketName handles head requests using simple cid/oid or bucketname/key format.
 func (h *Handler) HeadByAddressOrBucketName(c *fasthttp.RequestCtx) {
-	test, _ := c.UserValue("oid").(string)
-	var id oid.ID
+	cidParam, _ := c.UserValue("cid").(string)
+	oidParam, _ := c.UserValue("oid").(string)
 
-	err := id.DecodeString(test)
+	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 {
-		h.byS3Path(c, h.headObject)
+		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 {
+		h.byS3Path(ctx, req, bktInfo.CID, oidParam, h.headObject)
+	} else if err = objID.DecodeString(oidParam); err == nil {
+		h.byNativeAddress(ctx, req, bktInfo.CID, objID, h.headObject)
 	} else {
-		h.byNativeAddress(c, h.headObject)
+		logAndSendBucketError(c, log, checkS3Err)
+		return
 	}
 }