From b14e2d54c8275412079035608cdd4e64e56c3773 Mon Sep 17 00:00:00 2001
From: Evgeniy Kulikov <kim@nspcc.ru>
Date: Tue, 11 Aug 2020 17:37:20 +0300
Subject: [PATCH] Prepare list-objects handler

Signed-off-by: Evgeniy Kulikov <kim@nspcc.ru>
---
 api/handler/list-objects.go | 137 ++++++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 api/handler/list-objects.go

diff --git a/api/handler/list-objects.go b/api/handler/list-objects.go
new file mode 100644
index 000000000..241151b70
--- /dev/null
+++ b/api/handler/list-objects.go
@@ -0,0 +1,137 @@
+package handler
+
+import (
+	"net/http"
+	"strconv"
+	"time"
+
+	"github.com/gorilla/mux"
+	"github.com/nspcc-dev/neofs-s3-gate/api"
+	"github.com/nspcc-dev/neofs-s3-gate/api/layer"
+	"go.uber.org/zap"
+)
+
+type listObjectsArgs struct {
+	Bucket    string
+	Delimeter string
+	Encode    string
+	Marker    string
+	MaxKeys   int
+	Prefix    string
+	Version   string
+}
+
+var maxObjectList = 10000 // Limit number of objects in a listObjectsResponse/listObjectsVersionsResponse.
+
+func (h *handler) ListObjectsV1Handler(w http.ResponseWriter, r *http.Request) {
+	var (
+		err error
+		arg *listObjectsArgs
+		res *ListObjectsResponse
+		rid = api.GetRequestID(r.Context())
+	)
+
+	if arg, err = parseListObjectArgs(r); err != nil {
+		h.log.Error("something went wrong",
+			zap.String("request_id", rid),
+			zap.Error(err))
+
+		api.WriteErrorResponse(r.Context(), w, api.Error{
+			Code:           api.GetAPIError(api.ErrBadRequest).Code,
+			Description:    err.Error(),
+			HTTPStatusCode: http.StatusBadRequest,
+		}, r.URL)
+
+		return
+	}
+
+	list, err := h.obj.ListObjects(r.Context(), &layer.ListObjectsParams{
+		Bucket:    arg.Bucket,
+		Prefix:    arg.Prefix,
+		MaxKeys:   arg.MaxKeys,
+		Delimiter: arg.Delimeter,
+	})
+	if err != nil {
+		h.log.Error("something went wrong",
+			zap.String("request_id", rid),
+			zap.Error(err))
+
+		api.WriteErrorResponse(r.Context(), w, api.Error{
+			Code:           api.GetAPIError(api.ErrInternalError).Code,
+			Description:    err.Error(),
+			HTTPStatusCode: http.StatusInternalServerError,
+		}, r.URL)
+
+		return
+	}
+
+	res = &ListObjectsResponse{
+		Name:         arg.Bucket,
+		EncodingType: arg.Encode,
+		Marker:       arg.Marker,
+		Prefix:       arg.Prefix,
+		MaxKeys:      arg.MaxKeys,
+		Delimiter:    arg.Delimeter,
+
+		IsTruncated: list.IsTruncated,
+		NextMarker:  list.NextContinuationToken,
+	}
+
+	// fill common prefixes
+	for i := range list.Prefixes {
+		res.CommonPrefixes = append(res.CommonPrefixes, CommonPrefix{
+			Prefix: list.Prefixes[i],
+		})
+	}
+
+	// fill contents
+	for _, obj := range list.Objects {
+		res.Contents = append(res.Contents, Object{
+			Key:          obj.Name,
+			Size:         obj.Size,
+			UserMetadata: obj.Headers,
+			LastModified: obj.Created.Format(time.RFC3339),
+
+			// ETag:         "",
+			// Owner:        Owner{},
+			// StorageClass: "",
+		})
+	}
+
+	if err := api.EncodeToResponse(w, res); err != nil {
+		h.log.Error("something went wrong",
+			zap.String("request_id", rid),
+			zap.Error(err))
+
+		api.WriteErrorResponse(r.Context(), w, api.Error{
+			Code:           "XNeoFSUnimplemented",
+			Description:    "implement me " + mux.CurrentRoute(r).GetName(),
+			HTTPStatusCode: http.StatusNotImplemented,
+		}, r.URL)
+	}
+}
+
+func parseListObjectArgs(r *http.Request) (*listObjectsArgs, error) {
+	var (
+		err error
+		res listObjectsArgs
+	)
+
+	if r.URL.Query().Get("max-keys") == "" {
+		res.MaxKeys = maxObjectList
+	} else if res.MaxKeys, err = strconv.Atoi(r.URL.Query().Get("max-keys")); err != nil {
+		return nil, api.GetAPIError(api.ErrInvalidMaxKeys)
+	}
+
+	res.Prefix = r.URL.Query().Get("prefix")
+	res.Marker = r.URL.Query().Get("key-marker")
+	res.Delimeter = r.URL.Query().Get("delimiter")
+	res.Encode = r.URL.Query().Get("encoding-type")
+	res.Version = r.URL.Query().Get("version-id-marker")
+
+	if info := api.GetReqInfo(r.Context()); info != nil {
+		res.Bucket = info.BucketName
+	}
+
+	return &res, nil
+}