[#19] Extract uploading logic into a separate package

Signed-off-by: Pavel Korotkov <pavel@nspcc.ru>

uploader/upload.go

@@ -0,0 +1,154 @@
+package uploader
+
+import (
+	"context"
+	"encoding/json"
+	"io"
+	"strconv"
+	"time"
+
+	"github.com/nspcc-dev/neofs-api-go/pkg/container"
+	"github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-api-go/pkg/owner"
+	"github.com/nspcc-dev/neofs-api-go/pkg/token"
+	"github.com/nspcc-dev/neofs-http-gate/neofs"
+	"github.com/nspcc-dev/neofs-http-gate/tokens"
+	"github.com/valyala/fasthttp"
+	"go.uber.org/zap"
+)
+
+type Uploader struct {
+	log                    *zap.Logger
+	plant                  neofs.ClientPlant
+	enableDefaultTimestamp bool
+}
+
+func New(log *zap.Logger, plant neofs.ClientPlant, enableDefaultTimestamp bool) *Uploader {
+	return &Uploader{log, plant, enableDefaultTimestamp}
+}
+
+func (u *Uploader) Upload(c *fasthttp.RequestCtx) {
+	var (
+		err     error
+		file    MultipartFile
+		addr    *object.Address
+		cid     = container.NewID()
+		scid, _ = c.UserValue("cid").(string)
+		log     = u.log.With(zap.String("cid", scid))
+	)
+	if err = tokens.StoreBearerToken(c); err != nil {
+		log.Error("could not fetch bearer token", zap.Error(err))
+		c.Error("could not fetch bearer token", fasthttp.StatusBadRequest)
+		return
+	}
+	if err = cid.Parse(scid); err != nil {
+		log.Error("wrong container id", zap.Error(err))
+		c.Error("wrong container id", fasthttp.StatusBadRequest)
+		return
+	}
+	defer func() {
+		// if temporary reader can be closed - close it
+		if file == nil {
+			return
+		}
+		err := file.Close()
+		log.Debug(
+			"close temporary multipart/form file",
+			zap.Stringer("address", addr),
+			zap.String("filename", file.FileName()),
+			zap.Error(err),
+		)
+	}()
+	boundary := string(c.Request.Header.MultipartFormBoundary())
+	if file, err = fetchMultipartFile(u.log, c.RequestBodyStream(), boundary); err != nil {
+		log.Error("could not receive multipart/form", zap.Error(err))
+		c.Error("could not receive multipart/form: "+err.Error(), fasthttp.StatusBadRequest)
+		return
+	}
+	filtered := filterHeaders(u.log, &c.Request.Header)
+	attributes := make([]*object.Attribute, 0, len(filtered))
+	// prepares attributes from filtered headers
+	for key, val := range filtered {
+		attribute := object.NewAttribute()
+		attribute.SetKey(key)
+		attribute.SetValue(val)
+		attributes = append(attributes, attribute)
+	}
+	// sets FileName attribute if it wasn't set from header
+	if _, ok := filtered[object.AttributeFileName]; !ok {
+		filename := object.NewAttribute()
+		filename.SetKey(object.AttributeFileName)
+		filename.SetValue(file.FileName())
+		attributes = append(attributes, filename)
+	}
+	// sets Timestamp attribute if it wasn't set from header and enabled by settings
+	if _, ok := filtered[object.AttributeTimestamp]; !ok && u.enableDefaultTimestamp {
+		timestamp := object.NewAttribute()
+		timestamp.SetKey(object.AttributeTimestamp)
+		timestamp.SetValue(strconv.FormatInt(time.Now().Unix(), 10))
+		attributes = append(attributes, timestamp)
+	}
+	oid, bt := u.fetchOwnerAndBearerToken(c)
+	// prepares new object and fill it
+	raw := object.NewRaw()
+	raw.SetContainerID(cid)
+	raw.SetOwnerID(oid)
+	raw.SetAttributes(attributes...)
+	// tries to put file into NeoFS or throw error
+	// if addr, err = a.plant.Object().Put(c, raw.Object(), sdk.WithPutReader(file)); err != nil {
+	// TODO: Take this from a sync pool.
+	putOpts := new(neofs.PutOptions)
+	putOpts.Client, putOpts.SessionToken, err = u.plant.GetReusableArtifacts(c)
+	if err != nil {
+		log.Error("failed to get neofs client's reusable artifacts", zap.Error(err))
+		c.Error("failed to get neofs client's reusable artifacts", fasthttp.StatusInternalServerError)
+		return
+	}
+	putOpts.BearerToken = bt
+	putOpts.ContainerID = cid
+	putOpts.OwnerID = oid
+	putOpts.PrepareObjectOnsite = false
+	putOpts.Reader = file
+	if addr, err = u.plant.Object().Put(c, putOpts); err != nil {
+		log.Error("could not store file in NeoFS", zap.Error(err))
+		c.Error("could not store file in NeoFS", fasthttp.StatusBadRequest)
+		return
+	}
+	// tries to return response, otherwise, if something went wrong throw error
+	if err = newPutResponse(addr).encode(c); err != nil {
+		log.Error("could not prepare response", zap.Error(err))
+		c.Error("could not prepare response", fasthttp.StatusBadRequest)
+
+		return
+	}
+	// reports status code and content type
+	c.Response.SetStatusCode(fasthttp.StatusOK)
+	c.Response.Header.SetContentType(jsonHeader)
+}
+
+func (u *Uploader) fetchOwnerAndBearerToken(ctx context.Context) (*owner.ID, *token.BearerToken) {
+	if token, err := tokens.LoadBearerToken(ctx); err == nil && token != nil {
+		return token.Issuer(), token
+	}
+	return u.plant.OwnerID(), nil
+}
+
+type putResponse struct {
+	OID string `json:"object_id"`
+	CID string `json:"container_id"`
+}
+
+const jsonHeader = "application/json; charset=UTF-8"
+
+func newPutResponse(addr *object.Address) *putResponse {
+	return &putResponse{
+		OID: addr.ObjectID().String(),
+		CID: addr.ContainerID().String(),
+	}
+}
+
+func (pr *putResponse) encode(w io.Writer) error {
+	enc := json.NewEncoder(w)
+	enc.SetIndent("", "\t")
+	return enc.Encode(pr)
+}