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upload_large_file.go
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upload_large_file.go
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package b2
import (
"bytes"
"encoding/json"
"fmt"
"github.com/benbusby/b2/utils"
"net/http"
"net/http/httputil"
"os"
"strconv"
"strings"
)
const APIStartLargeFile string = "b2_start_large_file"
const APIGetUploadPartURL string = "b2_get_upload_part_url"
const APIFinishLargeFile = "b2_finish_large_file"
const APICancelLargeFile = "b2_cancel_large_file"
// StartFile represents the data returned by StartLargeFile
type StartFile struct {
AccountID string `json:"accountId"`
Action string `json:"action"`
BucketID string `json:"bucketId"`
ContentLength int64 `json:"contentLength"`
ContentSha1 string `json:"contentSha1"`
ContentType string `json:"contentType"`
FileID string `json:"fileId"`
FileInfo struct {
} `json:"fileInfo"`
FileName string `json:"fileName"`
FileRetention struct {
IsClientAuthorizedToRead bool `json:"isClientAuthorizedToRead"`
Value struct {
Mode any `json:"mode"`
RetainUntilTimestamp any `json:"retainUntilTimestamp"`
} `json:"value"`
} `json:"fileRetention"`
LegalHold struct {
IsClientAuthorizedToRead bool `json:"isClientAuthorizedToRead"`
Value any `json:"value"`
} `json:"legalHold"`
ServerSideEncryption struct {
Algorithm any `json:"algorithm"`
Mode any `json:"mode"`
} `json:"serverSideEncryption"`
UploadTimestamp int64 `json:"uploadTimestamp"`
}
// FilePartInfo represents the data returned by GetUploadPartURL
type FilePartInfo struct {
FileID string `json:"fileId"`
UploadURL string `json:"uploadUrl"`
AuthorizationToken string `json:"authorizationToken"`
Dummy bool
StorageMaximum int64
}
// LargeFile represents the file object created by FinishLargeFile
type LargeFile struct {
AccountID string `json:"accountId"`
Action string `json:"action"`
BucketID string `json:"bucketId"`
ContentLength int64 `json:"contentLength"`
ContentMd5 any `json:"contentMd5"`
ContentSha1 string `json:"contentSha1"`
ContentType string `json:"contentType"`
FileID string `json:"fileId"`
FileInfo struct {
} `json:"fileInfo"`
FileName string `json:"fileName"`
FileRetention struct {
IsClientAuthorizedToRead bool `json:"isClientAuthorizedToRead"`
Value any `json:"value"`
} `json:"fileRetention"`
LegalHold struct {
IsClientAuthorizedToRead bool `json:"isClientAuthorizedToRead"`
Value any `json:"value"`
} `json:"legalHold"`
ServerSideEncryption struct {
Algorithm string `json:"algorithm"`
Mode string `json:"mode"`
} `json:"serverSideEncryption"`
UploadTimestamp int64 `json:"uploadTimestamp"`
}
// StartLargeFile begins the process for uploading a multi-chunk file to B2.
// The filename provided cannot change once the large file upload has begun.
func (b2Service *Service) StartLargeFile(
filename string,
bucketID string,
) (StartFile, error) {
if b2Service.Dummy {
return StartFile{FileID: filename, FileName: filename}, nil
}
reqBody := bytes.NewBuffer([]byte(fmt.Sprintf(`{
"bucketId": "%s",
"fileName": "%s",
"contentType": "b2/x-auto"
}`, bucketID, filename)))
reqURL := utils.FormatB2URL(
b2Service.APIURL, b2Service.APIVersion, APIStartLargeFile)
req, err := http.NewRequest("POST", reqURL, reqBody)
if err != nil {
b2Service.Logf("B2Error creating new HTTP request: %v\n", err)
return StartFile{}, err
}
req.Header = http.Header{
"Content-Type": {"application/json"},
"Authorization": {b2Service.AuthorizationToken},
}
res, err := utils.Client.Do(req)
if err != nil {
b2Service.Logf("B2Error starting B2 file: %v\n", err)
return StartFile{}, err
} else if res.StatusCode >= 400 {
b2Service.Logf("\n%s %s\n", "POST", reqURL)
resp, _ := httputil.DumpResponse(res, true)
return StartFile{}, utils.NewB2Error(nil, string(resp))
}
var file StartFile
err = json.NewDecoder(res.Body).Decode(&file)
if err != nil {
b2Service.Logf("B2Error decoding B2 file init: %v", err)
return StartFile{}, err
}
return file, nil
}
// GetUploadPartURL generates a URL and token for uploading individual chunks
// of a file to B2. It requires a StartFile struct returned by StartLargeFile,
// which contains the unique file ID for this new file.
func (b2Service *Service) GetUploadPartURL(fileID string) (FilePartInfo, error) {
if b2Service.Dummy {
return FilePartInfo{
FileID: fileID,
UploadURL: b2Service.LocalPath,
Dummy: true,
StorageMaximum: b2Service.StorageMaximum,
}, nil
}
reqURL := utils.FormatB2URL(
b2Service.APIURL, b2Service.APIVersion, APIGetUploadPartURL)
req, err := http.NewRequest("GET", reqURL, nil)
q := req.URL.Query()
q.Add("fileId", fileID)
req.URL.RawQuery = q.Encode()
if err != nil {
b2Service.Logf("B2Error creating new HTTP request: %v\n", err)
return FilePartInfo{}, err
}
req.Header = http.Header{
"Content-Type": {"application/json"},
"Authorization": {b2Service.AuthorizationToken},
}
res, err := utils.Client.Do(req)
if err != nil {
b2Service.Logf("B2Error getting B2 upload url: %v\n", err)
return FilePartInfo{}, err
} else if res.StatusCode >= 400 {
b2Service.Logf("\n%s %s\n", "GET", reqURL)
resp, _ := httputil.DumpResponse(res, true)
return FilePartInfo{}, utils.NewB2Error(nil, string(resp))
}
var upload FilePartInfo
err = json.NewDecoder(res.Body).Decode(&upload)
if err != nil {
b2Service.Logf("B2Error decoding B2 upload part info: %v", err)
return FilePartInfo{}, err
}
return upload, nil
}
// UploadFilePart uploads a single chunk of file data to the URL provided by
// GetUploadPartURL. Each subsequent chunk should increment chunkNum, with the
// first chunk starting at 1 (not 0). Each chunk should be provided with a
// SHA1 checksum as well.
func UploadFilePart(
b2PartInfo FilePartInfo,
chunkNum int,
checksum string,
contents []byte,
) error {
if b2PartInfo.Dummy {
return uploadLocalFilePart(b2PartInfo, contents)
}
req, err := http.NewRequest(
"POST",
b2PartInfo.UploadURL,
bytes.NewBuffer(contents))
if err != nil {
return err
}
req.Header = http.Header{
"Authorization": {b2PartInfo.AuthorizationToken},
"Content-Length": {strconv.Itoa(len(contents))},
"X-Bz-Part-Number": {strconv.Itoa(chunkNum)},
"X-Bz-Content-Sha1": {checksum},
}
res, err := utils.Client.Do(req)
if err != nil {
return err
} else if res.StatusCode >= 400 {
resp, _ := httputil.DumpResponse(res, true)
return utils.NewB2Error(nil, string(resp))
}
return nil
}
// CancelLargeFile cancels an in-progress large file upload and deletes the
// partial file from the B2 bucket. Returns true if the file was successfully
// deleted, otherwise false.
// Requires the fileID returned from StartLargeFile.
func (b2Service *Service) CancelLargeFile(fileID string) (bool, error) {
if b2Service.Dummy {
return cancelLocalLargeFile(fileID, b2Service.LocalPath)
}
reqBody := bytes.NewBuffer([]byte(fmt.Sprintf(`{
"fileId": "%s"
}`, fileID)))
reqURL := utils.FormatB2URL(
b2Service.APIURL, b2Service.APIVersion, APICancelLargeFile)
req, err := http.NewRequest("POST", reqURL, reqBody)
if err != nil {
b2Service.Logf("B2Error creating new HTTP request: %v\n", err)
return false, err
}
req.Header = http.Header{
"Authorization": {b2Service.AuthorizationToken},
}
res, err := utils.Client.Do(req)
if err != nil {
b2Service.Logf("B2Error canceling B2 large file: %v\n", err)
return false, err
} else if res.StatusCode >= 400 {
b2Service.Logf("\n%s %s\n", "POST", reqURL)
resp, _ := httputil.DumpResponse(res, true)
return false, utils.NewB2Error(nil, string(resp))
}
return true, nil
}
// FinishLargeFile completes the chunked upload process. The FileID from
// calling StartLargeFile should be used here, and all checksums from
// UploadFilePart should be passed a string-ified array.
// For example: "['checksum1', 'checksum2']"
func (b2Service *Service) FinishLargeFile(
fileID string,
checksums []string,
) (LargeFile, error) {
if b2Service.Dummy {
return finishLargeLocalFile(fileID, b2Service.LocalPath)
}
checksumsString := "[\"" + strings.Join(checksums, "\",\"") + "\"]"
reqBody := bytes.NewBuffer([]byte(fmt.Sprintf(`{
"fileId": "%s",
"partSha1Array": %s
}`, fileID, checksumsString)))
reqURL := utils.FormatB2URL(
b2Service.APIURL, b2Service.APIVersion, APIFinishLargeFile)
req, err := http.NewRequest("POST", reqURL, reqBody)
if err != nil {
b2Service.Logf("B2Error creating new HTTP request: %v\n", err)
return LargeFile{}, err
}
req.Header = http.Header{
"Content-Type": {"application/json"},
"Authorization": {b2Service.AuthorizationToken},
}
res, err := utils.Client.Do(req)
if err != nil {
b2Service.Logf("B2Error finishing B2 upload: %v\n", err)
return LargeFile{}, err
} else if res.StatusCode >= 400 {
b2Service.Logf("\n%s %s\n", "POST", reqURL)
resp, _ := httputil.DumpResponse(res, true)
return LargeFile{}, utils.NewB2Error(nil, string(resp))
}
var largeFile LargeFile
err = json.NewDecoder(res.Body).Decode(&largeFile)
if err != nil {
b2Service.Logf("B2Error decoding B2 large file info: %v", err)
return LargeFile{}, err
}
return largeFile, nil
}
// uploadLocalFilePart writes part of a file to the machine instead of to a B2
// bucket
func uploadLocalFilePart(info FilePartInfo, contents []byte) error {
if info.StorageMaximum > 0 {
dirSize, err := utils.CheckDirSize(info.UploadURL)
if err != nil {
return err
}
if dirSize+int64(len(contents)) > int64(info.StorageMaximum) {
_, err = cancelLocalLargeFile(info.FileID, info.UploadURL)
if err != nil {
return err
}
return utils.StorageError
}
}
filename := fmt.Sprintf("%s/%s", strings.TrimSuffix(info.UploadURL, "/"), info.FileID)
f, err := os.OpenFile(filename, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0600)
if err != nil {
return err
}
defer func(f *os.File) {
_ = f.Close()
}(f)
_, err = f.Write(contents)
if err != nil {
return err
}
return nil
}
// cancelLocalLargeFile cancels an in-progress large file being written to
// disk by deleting it.
func cancelLocalLargeFile(id string, path string) (bool, error) {
if len(id) == 0 {
return false, nil
}
return deleteLocalFile(id, path)
}
// finishLargeLocalFile completes the process of uploading a file chunk-by-chunk
// to the local machine
func finishLargeLocalFile(id string, path string) (LargeFile, error) {
filePath := fmt.Sprintf("%s/%s", strings.TrimSuffix(path, "/"), id)
stat, err := os.Stat(filePath)
if err != nil {
return LargeFile{}, err
}
return LargeFile{
FileID: id,
FileName: id,
BucketID: id,
ContentLength: stat.Size(),
}, nil
}