1092400258

Committed 01 Dec 2023 02:41PM UTC coverage: 76.254% (-3.9%) from 80.201%

Build # 1092400258

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push

gitlab-ci

Committed by

web-flow

Commit Message

Merge pull request #334 from alfrunes/ALV-182

ALV-182: Add support for `HEAD` HTTP method for download API endpoint

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153 of 194 new or added lines in 2 files covered. (78.87%)

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78.42

/api/http/management_filetransfer.go

// Copyright 2021 Northern.tech AS
//
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
//
//        http://www.apache.org/licenses/LICENSE-2.0
//
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.

package http

import (
        "context"
        "fmt"
        "io"
        "net/http"
        "os"
        "path"
        "strconv"
        "time"

        "github.com/gin-gonic/gin"
        "github.com/google/uuid"
        natsio "github.com/nats-io/nats.go"
        "github.com/pkg/errors"
        "github.com/vmihailenco/msgpack/v5"

        "github.com/mendersoftware/go-lib-micro/identity"
        "github.com/mendersoftware/go-lib-micro/log"
        "github.com/mendersoftware/go-lib-micro/requestid"
        "github.com/mendersoftware/go-lib-micro/ws"
        wsft "github.com/mendersoftware/go-lib-micro/ws/filetransfer"

        "github.com/mendersoftware/deviceconnect/app"
        "github.com/mendersoftware/deviceconnect/model"
)

type fileTransferParams struct {
        TenantID  string
        UserID    string
        SessionID string
        Device    *model.Device
}

const (
        hdrContentType            = "Content-Type"
        hdrContentDisposition     = "Content-Disposition"
        hdrMenderFileTransferPath = "X-MEN-File-Path"
        hdrMenderFileTransferUID  = "X-MEN-File-UID"
        hdrMenderFileTransferGID  = "X-MEN-File-GID"
        hdrMenderFileTransferMode = "X-MEN-File-Mode"
        hdrMenderFileTransferSize = "X-MEN-File-Size"
)

const (
        fieldUploadPath = "path"
        fieldUploadUID  = "uid"
        fieldUploadGID  = "gid"
        fieldUploadMode = "mode"
        fieldUploadFile = "file"

        PropertyOffset = "offset"

        paramDownloadPath = "path"
)

var fileTransferTimeout = 60 * time.Second
var fileTransferBufferSize = 4096
var ackSlidingWindowSend = 10
var ackSlidingWindowRecv = 20

type Error struct {
        error      error
        statusCode int
}

func NewError(err error, code int) error {
        return &Error{
                error:      err,
                statusCode: code,
        }
}

func (err *Error) Error() string {
        return err.error.Error()
}

func (err *Error) Unwrap() error {
        return err.error
}

var (
        errFileTransferMarshalling   = errors.New("failed to marshal the request")
        errFileTransferUnmarshalling = errors.New("failed to unmarshal the request")
        errFileTransferPublishing    = errors.New("failed to publish the message")
        errFileTransferSubscribing   = errors.New("failed to subscribe to the mesages")
        errFileTransferTimeout       = &Error{
                error:      errors.New("file transfer timed out"),
                statusCode: http.StatusRequestTimeout,
        }
        errFileTransferFailed = &Error{
                error:      errors.New("file transfer failed"),
                statusCode: http.StatusBadRequest,
        }
        errFileTransferNotImplemented = &Error{
                error:      errors.New("file transfer not implemented on device"),
                statusCode: http.StatusBadGateway,
        }
        errFileTransferDisabled = &Error{
                error:      errors.New("file transfer disabled on device"),
                statusCode: http.StatusBadGateway,
        }
)

var newFileTransferSessionID = func() (uuid.UUID, error) {
        return uuid.NewRandom()
}

func (h ManagementController) getFileTransferParams(c *gin.Context) (*fileTransferParams, int,
        error) {
        ctx := c.Request.Context()

        idata := identity.FromContext(ctx)
        if idata == nil || !idata.IsUser {
                return nil, http.StatusUnauthorized, ErrMissingUserAuthentication
        }
        tenantID := idata.Tenant
        deviceID := c.Param("deviceId")

        device, err := h.app.GetDevice(ctx, tenantID, deviceID)
        if err == app.ErrDeviceNotFound {
                return nil, http.StatusNotFound, err
        } else if err != nil {
                return nil, http.StatusBadRequest, err
        } else if device.Status != model.DeviceStatusConnected {
                return nil, http.StatusConflict, app.ErrDeviceNotConnected
        }

        if c.Request.Method != http.MethodGet && c.Request.Body == nil {
                return nil, http.StatusBadRequest, errors.New("missing request body")
        }

        sessionID, err := newFileTransferSessionID()
        if err != nil {
                return nil, http.StatusInternalServerError,
                        errors.New("failed to generate session ID")
        }

        return &fileTransferParams{
                TenantID:  idata.Tenant,
                UserID:    idata.Subject,
                SessionID: sessionID.String(),
                Device:    device,
        }, 0, nil
}

func (h ManagementController) publishFileTransferProtoMessage(sessionID, userID, deviceTopic,
        msgType string, body interface{}, offset int64) error {
        var msgBody []byte
        if msgType == wsft.MessageTypeChunk && body != nil {
                msgBody = body.([]byte)
        } else if msgType == wsft.MessageTypeACK {
                msgBody = nil
        } else if body != nil {
                var err error
                msgBody, err = msgpack.Marshal(body)
                if err != nil {
                        return errors.Wrap(err, errFileTransferMarshalling.Error())
                }
        }
        proto := ws.ProtoTypeFileTransfer
        if msgType == ws.MessageTypePing || msgType == ws.MessageTypePong {
                proto = ws.ProtoTypeControl
        }
        msg := &ws.ProtoMsg{
                Header: ws.ProtoHdr{
                        Proto:     proto,
                        MsgType:   msgType,
                        SessionID: sessionID,
                        Properties: map[string]interface{}{
                                PropertyUserID: userID,
                        },
                },
                Body: msgBody,
        }
        if msgType == wsft.MessageTypeChunk || msgType == wsft.MessageTypeACK {
                msg.Header.Properties[PropertyOffset] = offset
        }
        data, err := msgpack.Marshal(msg)
        if err != nil {
                return errors.Wrap(err, errFileTransferMarshalling.Error())
        }

        err = h.nats.Publish(deviceTopic, data)
        if err != nil {
                return errors.Wrap(err, errFileTransferPublishing.Error())
        }
        return nil
}

func (h ManagementController) publishControlMessage(
        sessionID, deviceTopic, messageType string, body interface{},
) error {
        msg := &ws.ProtoMsg{
                Header: ws.ProtoHdr{
                        Proto:     ws.ProtoTypeControl,
                        MsgType:   messageType,
                        SessionID: sessionID,
                },
        }

        if body != nil {
                if b, ok := body.([]byte); ok {
                        msg.Body = b
                } else {
                        b, err := msgpack.Marshal(body)
                        if err != nil {
                                return errors.Wrap(errFileTransferMarshalling, err.Error())
                        }
                        msg.Body = b
                }
        }

        data, err := msgpack.Marshal(msg)
        if err != nil {
                return errors.Wrap(errFileTransferMarshalling, err.Error())
        }
        err = h.nats.Publish(deviceTopic, data)
        if err != nil {
                return errors.Wrap(errFileTransferPublishing, err.Error())
        }
        return err
}

func (h ManagementController) decodeFileTransferProtoMessage(data []byte) (*ws.ProtoMsg,
        interface{}, error) {
        msg := &ws.ProtoMsg{}
        err := msgpack.Unmarshal(data, msg)
        if err != nil {
                return nil, nil, errors.Wrap(err, errFileTransferUnmarshalling.Error())
        }

        switch msg.Header.MsgType {
        case wsft.MessageTypeError:
                msgBody := &wsft.Error{}
                err := msgpack.Unmarshal(msg.Body, msgBody)
                if err != nil {
                        return nil, nil, errors.Wrap(err, errFileTransferUnmarshalling.Error())
                }
                return msg, msgBody, nil
        case wsft.MessageTypeFileInfo:
                msgBody := &wsft.FileInfo{}
                err := msgpack.Unmarshal(msg.Body, msgBody)
                if err != nil {
                        return nil, nil, errors.Wrap(err, errFileTransferUnmarshalling.Error())
                }
                return msg, msgBody, nil
        case wsft.MessageTypeACK, wsft.MessageTypeChunk, ws.MessageTypePing, ws.MessageTypePong:
                return msg, nil, nil
        }

        return nil, nil, errors.Errorf("unexpected message type '%s'", msg.Header.MsgType)
}

func writeHeaders(c *gin.Context, fileInfo *wsft.FileInfo) {
        c.Writer.Header().Add(hdrContentType, "application/octet-stream")
        if fileInfo.Path != nil {
                filename := path.Base(*fileInfo.Path)
                c.Writer.Header().Add(hdrContentDisposition,
                        "attachment; filename=\""+filename+"\"")
                c.Writer.Header().Add(hdrMenderFileTransferPath, *fileInfo.Path)
        }
        if fileInfo.UID != nil {
                c.Writer.Header().Add(hdrMenderFileTransferUID, fmt.Sprintf("%d", *fileInfo.UID))
        }
        if fileInfo.GID != nil {
                c.Writer.Header().Add(hdrMenderFileTransferGID, fmt.Sprintf("%d", *fileInfo.GID))
        }
        if fileInfo.Mode != nil {
                c.Writer.Header().Add(hdrMenderFileTransferMode, fmt.Sprintf("%o", *fileInfo.Mode))
        }
        if fileInfo.Size != nil {
                c.Writer.Header().Add(hdrMenderFileTransferSize, fmt.Sprintf("%d", *fileInfo.Size))
        }
        c.Writer.WriteHeader(http.StatusOK)
}
func (h ManagementController) handleResponseError(c *gin.Context, err error) {
        l := log.FromContext(c.Request.Context())
        l.Errorf("error handling request: %s", err.Error())
        if !c.Writer.Written() {
                var statusError *Error
                var errMsg string = err.Error()
                var statusCode int = http.StatusInternalServerError
                if errors.As(err, &statusError) {
                        statusCode = statusError.statusCode
                }
                if statusCode >= 500 {
                        errMsg = "internal error"
                }
                c.Writer.WriteHeader(statusCode)
                c.JSON(statusCode, gin.H{
                        "error":      errMsg,
                        "request_id": requestid.FromContext(c.Request.Context()),
                })
        } else {
                l.Warn("response already written")
        }
}

func chanTimeout(
        src <-chan *natsio.Msg,
        timeout time.Duration,
) <-chan *natsio.Msg {
        timer := time.NewTimer(timeout)
        dst := make(chan *natsio.Msg)
        go func() {
                for {
                        select {
                        case <-timer.C:
                                close(dst)
                                return
                        case msg, ok := <-src:
                                if !ok {
                                        close(dst)
                                        return
                                }
                                if !timer.Stop() {
                                        // Timer must be stopped and drained before calling Reset.
                                        select {
                                        case <-timer.C:
                                        default:
                                        }
                                }
                                timer.Reset(timeout)
                                dst <- msg
                        }
                }
        }()
        return dst
}

func (h ManagementController) statFile(
        ctx context.Context,
        sessChan <-chan *natsio.Msg,
        path, sessionID, userID, deviceTopic string) (*wsft.FileInfo, error) {
        // stat the remote file
        req := wsft.StatFile{
                Path: &path,
        }
        if err := h.publishFileTransferProtoMessage(sessionID,
                userID, deviceTopic, wsft.MessageTypeStat, req, 0); err != nil {
                return nil, err
        }
        var fileInfo *wsft.FileInfo
        select {
        case rsp, ok := <-sessChan:
                if !ok {
                        return nil, errFileTransferTimeout
                }
                var msg ws.ProtoMsg
                err := msgpack.Unmarshal(rsp.Data, &msg)
                if err != nil {
                        return nil, fmt.Errorf("malformed message from device: %w", err)
                }
                if msg.Header.MsgType == ws.MessageTypeError {
                        var errMsg ws.Error
                        _ = msgpack.Unmarshal(msg.Body, &errMsg)
                        rspErr := NewError(
                                fmt.Errorf("error received from device: %s", errMsg.Error),
                                http.StatusBadRequest,
                        )
                        return nil, rspErr
                }
                if msg.Header.Proto != ws.ProtoTypeFileTransfer ||
                        msg.Header.MsgType != wsft.MessageTypeFileInfo {
                        return nil, fmt.Errorf("unexpected response from device %q", msg.Header.MsgType)
                }
                err = msgpack.Unmarshal(msg.Body, &fileInfo)
                if err != nil {
                        return nil, fmt.Errorf("malformed message body from device: %w", err)
                }
        case <-ctx.Done():
                return nil, ctx.Err()
        }
        return fileInfo, nil
}

func (h ManagementController) downloadFileResponse(c *gin.Context, params *fileTransferParams,
        request *model.DownloadFileRequest) {
        ctx := c.Request.Context()
        // send a JSON-encoded error message in case of failure

        // subscribe to messages from the device
        deviceTopic := model.GetDeviceSubject(params.TenantID, params.Device.ID)
        sessionTopic := model.GetSessionSubject(params.TenantID, params.SessionID)
        subChan := make(chan *natsio.Msg, channelSize)
        defer close(subChan)
        sub, err := h.nats.ChanSubscribe(sessionTopic, subChan)
        if err != nil {
                h.handleResponseError(c, errors.Wrap(err, errFileTransferSubscribing.Error()))
                return
        }
        //nolint:errcheck
        defer sub.Unsubscribe()

        msgChan := chanTimeout(subChan, fileTransferTimeout)

        if err = h.filetransferHandshake(msgChan, params.SessionID, deviceTopic); err != nil {
                h.handleResponseError(c, err)
                return
        }
        // Inform the device that we're closing the session
        //nolint:errcheck
        defer h.publishControlMessage(params.SessionID, deviceTopic, ws.MessageTypeClose, nil)

        fileInfo, err := h.statFile(
                ctx, msgChan, *request.Path,
                params.SessionID, params.UserID, deviceTopic,
        )
        if err != nil {
                h.handleResponseError(c, fmt.Errorf("failed to retrieve file info: %w", err))
                return
        }
        if fileInfo.Mode == nil || !os.FileMode(*fileInfo.Mode).IsRegular() {
                h.handleResponseError(
                        c,
                        NewError(fmt.Errorf("file must be a regular file"), http.StatusBadRequest),
                )
                return
        }
        writeHeaders(c, fileInfo)
        if c.Request.Method == http.MethodHead {
                return
        }
        err = h.downloadFile(
                ctx, msgChan, c.Writer, *request.Path,
                params.SessionID, params.UserID, deviceTopic,
        )
        if err != nil {
                log.FromContext(ctx).
                        Errorf("error downloading file from device: %s", err.Error())
        }
}

func (h ManagementController) downloadFile(
        ctx context.Context,
        msgChan <-chan *natsio.Msg,
        dst io.Writer,
        path, sessionID, userID, deviceTopic string,
) error {
        latestOffset := int64(0)
        numberOfChunks := 0
        req := wsft.GetFile{
                Path: &path,
        }
        if err := h.publishFileTransferProtoMessage(
                sessionID,
                userID,
                deviceTopic,
                wsft.MessageTypeGet,
                req, 0); err != nil {
                return err
        }
        for {
                select {
                case wsMessage, ok := <-msgChan:
                        if !ok {
                                return errFileTransferTimeout
                        }

                        // process the message
                        msg, msgBody, err := h.decodeFileTransferProtoMessage(wsMessage.Data)
                        if err != nil {
                                return err
                        }

                        // process incoming messages from the device by type
                        switch msg.Header.MsgType {

                        // error message, stop here
                        case wsft.MessageTypeError:
                                errorMsg := msgBody.(*wsft.Error)
                                return errors.New(*errorMsg.Error)

                        // file data chunk
                        case wsft.MessageTypeChunk:
                                if msg.Body == nil {
                                        if err := h.publishFileTransferProtoMessage(
                                                sessionID, userID, deviceTopic,
                                                wsft.MessageTypeACK, nil,
                                                latestOffset); err != nil {
                                                return err
                                        }
                                        return io.EOF
                                }

                                // verify the offset property
                                propOffset, _ := msg.Header.Properties[PropertyOffset].(int64)
                                if propOffset != latestOffset {
                                        return errors.Wrap(errFileTransferFailed,
                                                "wrong offset received")
                                }
                                latestOffset += int64(len(msg.Body))

                                _, err := dst.Write(msg.Body)
                                if err != nil {
                                        return err
                                }

                                numberOfChunks++
                                if numberOfChunks >= ackSlidingWindowSend {
                                        if err := h.publishFileTransferProtoMessage(
                                                sessionID, userID, deviceTopic,
                                                wsft.MessageTypeACK, nil,
                                                latestOffset); err != nil {
                                                return err
                                        }
                                        numberOfChunks = 0
                                }

                        case ws.MessageTypePing:
                                if err := h.publishFileTransferProtoMessage(
                                        sessionID, userID, deviceTopic,
                                        ws.MessageTypePong, nil,
                                        -1); err != nil {
                                        return err
                                }
                        }
                case <-ctx.Done():
                        return ctx.Err()
                }
        }
}

func (h ManagementController) DownloadFile(c *gin.Context) {
        l := log.FromContext(c.Request.Context())

        params, statusCode, err := h.getFileTransferParams(c)
        if err != nil {
                l.Error(err)
                c.JSON(statusCode, gin.H{"error": err.Error()})
                return
        }

        path := c.Request.URL.Query().Get(paramDownloadPath)
        request := &model.DownloadFileRequest{
                Path: &path,
        }

        if err := request.Validate(); err != nil {
                l.Error(err)
                c.JSON(http.StatusBadRequest, gin.H{
                        "error": errors.Wrap(err, "bad request").Error(),
                })
                return
        }

        ctx := c.Request.Context()
        if err := h.app.DownloadFile(ctx, params.UserID, params.Device.ID,
                *request.Path); err != nil {
                l.Error(err)
                c.JSON(http.StatusInternalServerError, gin.H{
                        "error": errors.Wrap(err, "bad request").Error(),
                })
                return
        }

        h.downloadFileResponse(c, params, request)
}

func (h ManagementController) uploadFileResponseHandleInboundMessages(
        c *gin.Context, params *fileTransferParams,
        msgChan chan *natsio.Msg, errorChan chan error,
        latestAckOffsets chan int64,
) {
        var latestAckOffset int64
        deviceTopic := model.GetDeviceSubject(params.TenantID, params.Device.ID)
        for {
                select {
                case wsMessage := <-msgChan:
                        msg, msgBody, err := h.decodeFileTransferProtoMessage(
                                wsMessage.Data)
                        if err != nil {
                                errorChan <- err
                                return
                        }

                        // process incoming messages from the device by type
                        switch msg.Header.MsgType {

                        // error message, stop here
                        case wsft.MessageTypeError:
                                errorMsg := msgBody.(*wsft.Error)
                                errorChan <- errors.New(*errorMsg.Error)
                                return

                        // you can continue the upload
                        case wsft.MessageTypeACK:
                                propValue := msg.Header.Properties[PropertyOffset]
                                propOffset, _ := propValue.(int64)
                                if propOffset > latestAckOffset {
                                        latestAckOffset = propOffset
                                        select {
                                        case latestAckOffsets <- latestAckOffset:
                                        case <-latestAckOffsets:
                                                // Replace ack offset with the latest one
                                                latestAckOffsets <- latestAckOffset
                                        }
                                }

                        // handle ping messages
                        case ws.MessageTypePing:
                                if err := h.publishFileTransferProtoMessage(
                                        params.SessionID, params.UserID, deviceTopic,
                                        ws.MessageTypePong, nil,
                                        -1); err != nil {
                                        errorChan <- err
                                }
                        }
                case <-c.Done():
                        return
                }
        }
}

// filetransferHandshake initiates a handshake and checks that the device
// is willing to accept file transfer requests.
func (h ManagementController) filetransferHandshake(
        sessChan <-chan *natsio.Msg, sessionID, deviceTopic string,
) error {
        if err := h.publishControlMessage(
                sessionID, deviceTopic,
                ws.MessageTypeOpen, ws.Open{
                        Versions: []int{ws.ProtocolVersion},
                }); err != nil {
                return errFileTransferPublishing
        }
        select {
        case natsMsg, ok := <-sessChan:
                if !ok {
                        return errFileTransferTimeout
                }
                var msg ws.ProtoMsg
                err := msgpack.Unmarshal(natsMsg.Data, &msg)
                if err != nil {
                        return errFileTransferUnmarshalling
                }

                if msg.Header.MsgType == ws.MessageTypeError {
                        erro := new(ws.Error)
                        //nolint:errcheck
                        msgpack.Unmarshal(natsMsg.Data, erro)
                        return errors.Errorf("handshake error from client: %s", erro.Error)
                } else if msg.Header.MsgType != ws.MessageTypeAccept {
                        return errFileTransferNotImplemented
                }
                accept := new(ws.Accept)
                err = msgpack.Unmarshal(msg.Body, accept)
                if err != nil {
                        return errFileTransferUnmarshalling
                }

                for _, proto := range accept.Protocols {
                        if proto == ws.ProtoTypeFileTransfer {
                                return nil
                        }
                }
                // Let's try to be polite and close the session before returning
                //nolint:errcheck
                h.publishControlMessage(sessionID, deviceTopic, ws.MessageTypeClose, nil)
                return errFileTransferDisabled

        case <-time.After(fileTransferTimeout):
                return errFileTransferTimeout
        }
}

func (h ManagementController) uploadFileResponse(c *gin.Context, params *fileTransferParams,
        request *model.UploadFileRequest) {
        l := log.FromContext(c.Request.Context())

        // send a JSON-encoded error message in case of failure
        var responseError error
        errorStatusCode := http.StatusInternalServerError
        defer func() {
                if responseError != nil {
                        l.Error(responseError.Error())
                        c.JSON(errorStatusCode, gin.H{
                                "error": responseError.Error(),
                        })
                        return
                }
        }()

        // subscribe to messages from the device
        deviceTopic := model.GetDeviceSubject(params.TenantID, params.Device.ID)
        sessionTopic := model.GetSessionSubject(params.TenantID, params.SessionID)
        msgChan := make(chan *natsio.Msg, channelSize)
        sub, err := h.nats.ChanSubscribe(sessionTopic, msgChan)
        if err != nil {
                responseError = errors.Wrap(err, errFileTransferSubscribing.Error())
                return
        }

        //nolint:errcheck
        defer sub.Unsubscribe()

        if err = h.filetransferHandshake(msgChan, params.SessionID, deviceTopic); err != nil {
                switch err {
                case errFileTransferTimeout:
                        errorStatusCode = http.StatusRequestTimeout
                case errFileTransferNotImplemented, errFileTransferDisabled:
                        errorStatusCode = http.StatusBadGateway
                }
                responseError = err
                return
        }

        // Inform the device that we're closing the session
        //nolint:errcheck
        defer h.publishControlMessage(params.SessionID, deviceTopic, ws.MessageTypeClose, nil)

        // initialize the file transfer
        req := wsft.UploadRequest{
                SrcPath: request.SrcPath,
                Path:    request.Path,
                UID:     request.UID,
                GID:     request.GID,
                Mode:    request.Mode,
        }
        if err := h.publishFileTransferProtoMessage(params.SessionID,
                params.UserID, deviceTopic, wsft.MessageTypePut, req, 0); err != nil {
                responseError = err
                return
        }

        // receive the message from the device
        select {
        case wsMessage := <-msgChan:
                msg, msgBody, err := h.decodeFileTransferProtoMessage(wsMessage.Data)
                if err != nil {
                        responseError = err
                        return
                }

                // process incoming messages from the device by type
                switch msg.Header.MsgType {

                // error message, stop here
                case wsft.MessageTypeError:
                        errorMsg := msgBody.(*wsft.Error)
                        errorStatusCode = http.StatusBadRequest
                        responseError = errors.New(*errorMsg.Error)
                        return

                // you can continue the upload
                case wsft.MessageTypeACK:
                }

        // no message after timeout expired, stop here
        case <-time.After(fileTransferTimeout):
                errorStatusCode = http.StatusRequestTimeout
                responseError = errFileTransferTimeout
                return
        }

        // receive the ack message from the device
        latestAckOffsets := make(chan int64, 1)
        errorChan := make(chan error)
        go h.uploadFileResponseHandleInboundMessages(
                c, params, msgChan, errorChan, latestAckOffsets,
        )

        h.uploadFileResponseWriter(
                c, params, request, errorChan, latestAckOffsets, &errorStatusCode, &responseError,
        )
}

func (h ManagementController) uploadFileResponseWriter(c *gin.Context,
        params *fileTransferParams, request *model.UploadFileRequest,
        errorChan chan error, latestAckOffsets <-chan int64,
        errorStatusCode *int, responseError *error) {
        var (
                offset          int64
                latestAckOffset int64
        )
        deviceTopic := model.GetDeviceSubject(params.TenantID, params.Device.ID)

        timeout := time.NewTimer(fileTransferTimeout)
        data := make([]byte, fileTransferBufferSize)
        for {
                n, err := request.File.Read(data)
                if err != nil && err != io.EOF {
                        if err == io.ErrUnexpectedEOF {
                                *errorStatusCode = http.StatusBadRequest
                                *responseError = errors.New(
                                        "malformed request body: " +
                                                "did not find closing multipart boundary",
                                )
                        } else {
                                *responseError = err
                        }
                        return
                } else if n == 0 {
                        if err := h.publishFileTransferProtoMessage(params.SessionID,
                                params.UserID, deviceTopic, wsft.MessageTypeChunk, nil,
                                offset); err != nil {
                                *responseError = err
                                return
                        }
                        break
                }

                // send the chunk
                if err := h.publishFileTransferProtoMessage(params.SessionID,
                        params.UserID, deviceTopic, wsft.MessageTypeChunk, data[0:n],
                        offset); err != nil {
                        *responseError = err
                        return
                }

                // update the offset
                offset += int64(n)

                // wait for acks, in case the ack sliding window is over
                if offset > latestAckOffset+int64(fileTransferBufferSize*ackSlidingWindowRecv) {
                        timeout.Reset(fileTransferTimeout)
                        select {
                        case err := <-errorChan:
                                *errorStatusCode = http.StatusBadRequest
                                *responseError = err
                                return
                        case latestAckOffset = <-latestAckOffsets:
                        case <-timeout.C:
                                *errorStatusCode = http.StatusRequestTimeout
                                *responseError = errFileTransferTimeout
                                return
                        }
                } else {
                        // in case of error, report it
                        select {
                        case err := <-errorChan:
                                *errorStatusCode = http.StatusBadRequest
                                *responseError = err
                                return
                        default:
                        }
                }

        }

        for offset > latestAckOffset {
                timeout.Reset(fileTransferTimeout)
                select {
                case latestAckOffset = <-latestAckOffsets:
                case <-timeout.C:
                        *errorStatusCode = http.StatusRequestTimeout
                        *responseError = errFileTransferTimeout
                        return
                }
        }

        c.Writer.WriteHeader(http.StatusCreated)
}

func (h ManagementController) parseUploadFileRequest(c *gin.Context) (*model.UploadFileRequest,
        error) {
        reader, err := c.Request.MultipartReader()
        if err != nil {
                return nil, err
        }

        request := &model.UploadFileRequest{}
        for {
                part, err := reader.NextPart()
                if err == io.EOF {
                        break
                }
                if err != nil {
                        return nil, err
                }
                var n int
                data := make([]byte, fileTransferBufferSize)
                partName := part.FormName()
                switch partName {
                case fieldUploadPath, fieldUploadUID, fieldUploadGID, fieldUploadMode:
                        n, err = part.Read(data)
                        var value string
                        if err == nil || err == io.EOF {
                                value = string(data[:n])
                        }
                        switch partName {
                        case fieldUploadPath:
                                request.Path = &value
                        case fieldUploadUID:
                                v, err := strconv.Atoi(string(data[:n]))
                                if err != nil {
                                        return nil, err
                                }
                                nUID := uint32(v)
                                request.UID = &nUID
                        case fieldUploadGID:
                                v, err := strconv.Atoi(string(data[:n]))
                                if err != nil {
                                        return nil, err
                                }
                                nGID := uint32(v)
                                request.GID = &nGID
                        case fieldUploadMode:
                                v, err := strconv.ParseUint(string(data[:n]), 8, 32)
                                if err != nil {
                                        return nil, err
                                }
                                nMode := uint32(v)
                                request.Mode = &nMode
                        }
                        part.Close()
                case fieldUploadFile:
                        filename := part.FileName()
                        request.SrcPath = &filename
                        request.File = part
                }
                // file is the last part we can process, in order to avoid loading it in memory
                if request.File != nil {
                        break
                }
        }

        return request, nil
}

func (h ManagementController) UploadFile(c *gin.Context) {
        l := log.FromContext(c.Request.Context())

        params, statusCode, err := h.getFileTransferParams(c)
        if err != nil {
                l.Error(err.Error())
                c.JSON(statusCode, gin.H{"error": err.Error()})
                return
        }

        request, err := h.parseUploadFileRequest(c)
        if err != nil {
                l.Error(err.Error())
                c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
                return
        }

        if err := request.Validate(); err != nil {
                l.Error(err.Error())
                c.JSON(http.StatusBadRequest, gin.H{
                        "error": errors.Wrap(err, "bad request").Error(),
                })
                return
        }

        defer request.File.Close()

        ctx := c.Request.Context()
        if err := h.app.UploadFile(ctx, params.UserID, params.Device.ID,
                *request.Path); err != nil {
                l.Error(err)
                c.JSON(http.StatusInternalServerError, gin.H{
                        "error": errors.Wrap(err, "bad request").Error(),
                })
                return
        }

        h.uploadFileResponse(c, params, request)
}

mendersoftware / deviceconnect / 1092400258

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