5ada11af4c
* Needs more comments * Reorganize methods and code * Fix the way an upload struct is passed around * Write reproducible tests
570 lines
13 KiB
Go
570 lines
13 KiB
Go
package b2
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"net/url"
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"time"
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)
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// APIurl base address for the B2 API
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const APIurl = "https://api.backblaze.com"
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// APIsuffix the version of the API
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const APIsuffix = "/b2api/v1"
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// GoodStatus status code for a successful API call
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const GoodStatus = 200
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// ErrGeneric generic error from API
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var ErrGeneric = errors.New("Received invalid response from B2 API")
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// B2 communicates to B2 API and holds information for the connection
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type B2 struct {
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AccountID string `json:"accountId"`
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APIUrl string `json:"apiUrl"`
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AuthToken string `json:"authorizationToken"`
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DownloadURL string `json:"downloadUrl"`
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AppKey string `json:"-"`
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Upload *Upload `json:"-"`
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}
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// Upload B2 upload information
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type Upload struct {
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BucketID string `json:"bucketId"`
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UploadURL string `json:"uploadUrl"`
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AuthToken string `json:"authorizationToken"`
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}
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// Bucket B2 bucket type
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type Bucket struct {
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AccountID string `json:"accountId"`
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ID string `json:"bucketId"`
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Name string `json:"bucketName"`
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Type string `json:"bucketType"`
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}
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// FileInfo B2 file information
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type FileInfo struct {
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AccountID string `json:"accountId"`
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ID string `json:"fileId"`
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Name string `json:"fileName"`
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BucketID string `json:"bucketId"`
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Length int64 `json:"contentLength"`
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Sha1 string `json:"contentSha1"`
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Type string `json:"contentType"`
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Info map[string]string `json:"fileInfo"`
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}
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// FileName B2 file name
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type FileName struct {
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ID string `json:"fileId"`
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Name string `json:"fileName"`
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Action string `json:"action"`
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Size int64 `json:"size"`
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Timestamp int64 `json:"uploadTimestamp"`
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}
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// Err B2 error information
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type Err struct {
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Code string `json:"code"`
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Message string `json:"message"`
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Status int `json:"status"`
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}
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func (b *Err) Error() string {
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return fmt.Sprintf("code: '%s' status: '%d' message: '%s'", b.Code, b.Status, b.Message)
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}
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func readResp(resp *http.Response, output interface{}) error {
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data, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return err
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}
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if resp.StatusCode == GoodStatus {
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err = json.Unmarshal(data, output)
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if err != nil {
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return err
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}
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return nil
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}
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errb2 := &Err{}
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err = json.Unmarshal(data, errb2)
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if err != nil {
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return err
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}
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return errb2
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}
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// NewB2 create a new B2 API handler
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func NewB2(accountID string, applicationKey string) (*B2, error) {
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req, err := http.NewRequest("GET", APIurl+APIsuffix+"/b2_authorize_account", nil)
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if err != nil {
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return nil, err
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}
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req.SetBasicAuth(accountID, applicationKey)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, err
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}
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b2 := &B2{}
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err = readResp(resp, b2)
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if err != nil {
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return nil, err
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}
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return b2, nil
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}
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// CreateBucket creates a new bucket
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func (b *B2) CreateBucket(bucketName string, bucketType string) (*Bucket, error) {
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req, err := http.NewRequest("GET", b.APIUrl+APIsuffix+"/b2_create_bucket", nil)
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if err != nil {
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return nil, err
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}
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req.Header.Add("Authorization", b.AuthToken)
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q := req.URL.Query()
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q.Add("accountId", b.AccountID)
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q.Add("bucketName", bucketName)
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q.Add("bucketType", bucketType)
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req.URL.RawQuery = q.Encode()
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, err
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}
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bucket := &Bucket{}
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err = readResp(resp, bucket)
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if err != nil {
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return nil, err
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}
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return bucket, nil
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}
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// DeleteBucket deletes the bucket specified
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func (b *B2) DeleteBucket(bucketID string) (*Bucket, error) {
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data, err := json.Marshal(map[string]string{
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"accountId": b.AccountID,
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"bucketId": bucketID,
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})
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if err != nil {
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return nil, err
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}
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req, err := http.NewRequest("POST", b.APIUrl+APIsuffix+"/b2_delete_bucket", bytes.NewReader(data))
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if err != nil {
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return nil, err
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}
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req.Header.Add("Authorization", b.AuthToken)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, err
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}
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bucket := &Bucket{}
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err = readResp(resp, bucket)
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if err != nil {
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return nil, err
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}
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return bucket, nil
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}
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// GetUploadURL gets an URL to use for uploading files
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func (b *B2) GetUploadURL(bucketID string) (*Upload, error) {
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data, err := json.Marshal(map[string]string{
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"bucketId": bucketID,
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})
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if err != nil {
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return nil, err
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}
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req, err := http.NewRequest("POST", b.APIUrl+APIsuffix+"/b2_get_upload_url", bytes.NewReader(data))
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if err != nil {
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return nil, err
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}
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req.Header.Add("Authorization", b.AuthToken)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, err
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}
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upload := &Upload{}
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err = readResp(resp, upload)
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if err != nil {
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return nil, err
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}
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return upload, nil
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}
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// UploadFile uploads one file to B2
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func (b *B2) UploadFile(data io.Reader, fileName string, fileSize int64, contentType string, sha1 string, mtime *time.Time, info map[string]string) (*FileInfo, error) {
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if b.Upload == nil {
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return nil, errors.New("Must run GetUploadURL and set B2.Upload to upload")
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}
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req, err := http.NewRequest("POST", b.Upload.UploadURL, data)
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if err != nil {
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return nil, err
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}
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req.ContentLength = fileSize
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if contentType == "" {
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contentType = "b2/x-auto"
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}
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fileEncoded, err := url.Parse(fileName)
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if err != nil {
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return nil, err
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}
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fileName = fileEncoded.String()
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req.Header.Add("Authorization", b.Upload.AuthToken)
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req.Header.Add("X-Bz-File-Name", fileName)
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req.Header.Add("Content-Type", contentType)
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req.Header.Add("X-Bz-Content-Sha1", sha1)
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if mtime != nil {
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req.Header.Add("X-Bz-Info-src_last_modified_millis", fmt.Sprint(mtime.UnixNano()/1000000))
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}
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if info != nil {
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for name, value := range info {
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req.Header.Add("X-Bz-Info-"+name, value)
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}
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}
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, err
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}
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fileInfo := &FileInfo{}
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err = readResp(resp, fileInfo)
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if err != nil {
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return nil, err
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}
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return fileInfo, nil
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}
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// DownloadFileByID Downloads one file from B2
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func (b *B2) DownloadFileByID(fileID string, output io.Writer) (http.Header, error) {
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req, err := http.NewRequest("GET", b.DownloadURL+APIsuffix+"/b2_download_file_by_id", nil)
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if err != nil {
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return nil, err
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}
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req.Header.Add("Authorization", b.AuthToken)
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q := req.URL.Query()
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q.Add("fileId", fileID)
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req.URL.RawQuery = q.Encode()
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, err
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}
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if resp.StatusCode != GoodStatus {
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return nil, readResp(resp, nil)
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}
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defer resp.Body.Close()
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_, err = io.Copy(output, resp.Body)
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if err != nil {
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return nil, err
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}
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return resp.Header, nil
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}
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// DownloadFileByName downloads one file by providing the name of the bucket and the name of the file
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func (b *B2) DownloadFileByName(bucketName string, fileName string, output io.Writer) (http.Header, error) {
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urlFileName, err := url.Parse(fileName)
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if err != nil {
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return nil, err
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}
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req, err := http.NewRequest("GET", b.DownloadURL+"/file/"+bucketName+"/"+urlFileName.String(), nil)
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if err != nil {
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return nil, err
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}
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req.Header.Add("Authorization", b.AuthToken)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, err
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}
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if resp.StatusCode != GoodStatus {
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return nil, readResp(resp, nil)
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}
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defer resp.Body.Close()
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_, err = io.Copy(output, resp.Body)
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if err != nil {
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return nil, err
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}
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return resp.Header, nil
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}
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// UpdateBucket update an existing bucket
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func (b *B2) UpdateBucket(bucketID string, bucketType string) (*Bucket, error) {
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data, err := json.Marshal(map[string]string{
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"accountId": b.AccountID,
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"bucketId": bucketID,
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"bucketType": bucketType,
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})
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if err != nil {
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return nil, err
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}
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req, err := http.NewRequest("POST", b.APIUrl+APIsuffix+"/b2_update_bucket", bytes.NewReader(data))
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if err != nil {
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return nil, err
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}
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req.Header.Add("Authorization", b.AuthToken)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, err
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}
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bucket := &Bucket{}
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err = readResp(resp, bucket)
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if err != nil {
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return nil, err
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}
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return bucket, nil
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}
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// DeleteFileVersion deletes one version of a file from B2
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func (b *B2) DeleteFileVersion(fileName string, fileID string) (*FileInfo, error) {
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data, err := json.Marshal(map[string]string{
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"fileName": fileName,
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"fileId": fileID,
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})
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if err != nil {
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return nil, err
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}
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req, err := http.NewRequest("POST", b.APIUrl+APIsuffix+"/b2_delete_file_version", bytes.NewReader(data))
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if err != nil {
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return nil, err
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}
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req.Header.Add("Authorization", b.AuthToken)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, err
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}
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fileInfo := &FileInfo{}
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err = readResp(resp, fileInfo)
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if err != nil {
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return nil, err
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}
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return fileInfo, nil
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}
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// ListBuckets lists buckets associated with an account, in alphabetical order by bucket ID
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func (b *B2) ListBuckets() ([]Bucket, error) {
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data, err := json.Marshal(map[string]string{
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"accountId": b.AccountID,
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})
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if err != nil {
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return nil, err
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}
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req, err := http.NewRequest("POST", b.APIUrl+APIsuffix+"/b2_list_buckets", bytes.NewReader(data))
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if err != nil {
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return nil, err
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}
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req.Header.Add("Authorization", b.AuthToken)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, err
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}
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buckets := &struct {
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Buckets []Bucket `json:"buckets"`
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}{}
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err = readResp(resp, buckets)
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if err != nil {
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return nil, err
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}
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return buckets.Buckets, nil
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}
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// ListFileNames Lists the names of all files in a bucket, starting at a given name<Paste>
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func (b *B2) ListFileNames(bucketID string, startFileName string, maxFileCount int) ([]FileName, string, error) {
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data, err := json.Marshal(struct {
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BucketID string `json:"bucketId"`
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StartFileName string `json:"startFileName,omitempty"`
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MaxFileCount int `json:"maxFileCount,omitempty"`
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}{
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BucketID: bucketID,
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StartFileName: startFileName,
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MaxFileCount: maxFileCount,
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})
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if err != nil {
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return nil, "", err
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}
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req, err := http.NewRequest("POST", b.APIUrl+APIsuffix+"/b2_list_file_names", bytes.NewReader(data))
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if err != nil {
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return nil, "", err
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}
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req.Header.Add("Authorization", b.AuthToken)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, "", err
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}
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list := &struct {
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Files []FileName `json:"files"`
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NextFileName string `json:"nextFileName"`
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}{}
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err = readResp(resp, list)
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if err != nil {
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return nil, "", err
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}
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return list.Files, list.NextFileName, nil
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}
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// ListFileVersions lists all of the versions of all of the files contained in one bucket, in alphabetical order by file name, and by reverse of date/time uploaded for versions of files with the same name
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func (b *B2) ListFileVersions(bucketID string, startFileName string, startFileID string, maxFileCount int) ([]FileName, string, string, error) {
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data, err := json.Marshal(struct {
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BucketID string `json:"bucketId"`
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StartFileName string `json:"startFileName,omitempty"`
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StartFileID string `json:"startFileId,omitempty"`
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MaxFileCount int `json:"maxFileCount,omitempty"`
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}{
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BucketID: bucketID,
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StartFileName: startFileName,
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StartFileID: startFileID,
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MaxFileCount: maxFileCount,
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})
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if err != nil {
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return nil, "", "", err
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}
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req, err := http.NewRequest("POST", b.APIUrl+APIsuffix+"/b2_list_file_versions", bytes.NewReader(data))
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if err != nil {
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return nil, "", "", err
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}
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req.Header.Add("Authorization", b.AuthToken)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, "", "", err
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}
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list := &struct {
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Files []FileName `json:"files"`
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NextFileID string `json:"nextFileId"`
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NextFileName string `json:"nextFileName"`
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}{}
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err = readResp(resp, list)
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if err != nil {
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return nil, "", "", err
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}
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return list.Files, list.NextFileID, list.NextFileName, nil
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}
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// GetFileInfo Gets information about one file stored in B2
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func (b *B2) GetFileInfo(fileID string) (*FileInfo, error) {
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data, err := json.Marshal(map[string]string{
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"fileId": fileID,
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})
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if err != nil {
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return nil, err
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}
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req, err := http.NewRequest("POST", b.APIUrl+APIsuffix+"/b2_get_file_info", bytes.NewReader(data))
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if err != nil {
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return nil, err
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}
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req.Header.Add("Authorization", b.AuthToken)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, err
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}
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info := &FileInfo{}
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err = readResp(resp, info)
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if err != nil {
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return nil, err
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}
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return info, nil
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}
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// HideFile hides a file so that downloading by name will not find the file, but previous versions of the file are still stored. See File Versions about what it means to hide a file
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func (b *B2) HideFile(bucketID string, fileName string) (*FileName, error) {
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data, err := json.Marshal(map[string]string{
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"bucketId": bucketID,
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"fileName": fileName,
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})
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if err != nil {
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return nil, err
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}
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req, err := http.NewRequest("POST", b.APIUrl+APIsuffix+"/b2_hide_file", bytes.NewReader(data))
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if err != nil {
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return nil, err
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}
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req.Header.Add("Authorization", b.AuthToken)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return nil, err
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}
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info := &FileName{}
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err = readResp(resp, info)
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if err != nil {
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return nil, err
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}
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return info, nil
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}
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