/
ssblob.go
189 lines (161 loc) · 3.77 KB
/
ssblob.go
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// Package ssblob provides a blob implementation for the Archivematica Storage
// Service. Use OpenBucket to construct a *blob.Bucket.
package ssblob
import (
"context"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"github.com/hashicorp/go-cleanhttp"
"gocloud.dev/blob"
"gocloud.dev/blob/driver"
"gocloud.dev/gcerrors"
)
var errNotImplemented = errors.New("not implemented")
type APIError struct {
Status string
Code int
}
func (err *APIError) Error() string {
return err.Status
}
type bucket struct {
baseURL *url.URL
client *http.Client
}
type Options struct {
URL string
Key string
Username string
}
func openBucket(opts *Options) (driver.Bucket, error) {
u, err := url.Parse(opts.URL)
if err != nil {
return nil, err
}
client := &http.Client{
Transport: &transport{
key: fmt.Sprintf("%s:%s", opts.Username, opts.Key),
t: cleanhttp.DefaultPooledTransport(),
},
}
return &bucket{
baseURL: u,
client: client,
}, nil
}
func OpenBucket(opts *Options) (*blob.Bucket, error) {
drv, err := openBucket(opts)
if err != nil {
return nil, err
}
return blob.NewBucket(drv), nil
}
func (b *bucket) ErrorCode(err error) gcerrors.ErrorCode {
if err, ok := err.(*APIError); ok {
switch {
case err.Code == http.StatusNotFound:
return gcerrors.NotFound
case err.Code == http.StatusUnauthorized:
return gcerrors.PermissionDenied
case err.Code >= 400:
return gcerrors.Unknown
case err.Code >= 500:
return gcerrors.Internal
}
}
switch err {
case errNotImplemented:
return gcerrors.Unimplemented
default:
return gcerrors.Unknown
}
}
func (b *bucket) As(i interface{}) bool {
p, ok := i.(**http.Client)
if !ok {
return false
}
*p = b.client
return true
}
func (b *bucket) ErrorAs(err error, i interface{}) bool {
switch v := err.(type) {
case *APIError:
if p, ok := i.(**APIError); ok {
*p = v
return true
}
}
return false
}
func (b *bucket) Attributes(ctx context.Context, key string) (*driver.Attributes, error) {
return nil, errNotImplemented
}
func (b *bucket) ListPaged(ctx context.Context, opts *driver.ListOptions) (*driver.ListPage, error) {
return nil, errNotImplemented
}
func (b *bucket) NewRangeReader(
ctx context.Context,
key string,
offset, length int64,
opts *driver.ReaderOptions,
) (driver.Reader, error) {
url := b.baseURL.JoinPath("api/v2/file", key, "download")
req, err := http.NewRequestWithContext(ctx, http.MethodGet, url.String(), nil)
if err != nil {
return nil, err
}
resp, err := b.client.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode >= 400 {
return nil, &APIError{Status: resp.Status, Code: resp.StatusCode}
}
return &reader{
r: resp.Body,
attrs: driver.ReaderAttributes{
ContentType: resp.Header.Get("Content-Type"),
Size: resp.ContentLength,
},
}, nil
}
func (b *bucket) NewTypedWriter(
ctx context.Context,
key, contentType string,
opts *driver.WriterOptions,
) (driver.Writer, error) {
return nil, errNotImplemented
}
func (b *bucket) Copy(ctx context.Context, dstKey, srcKey string, opts *driver.CopyOptions) error {
return errNotImplemented
}
func (b *bucket) Delete(ctx context.Context, key string) error {
return errNotImplemented
}
func (b *bucket) SignedURL(ctx context.Context, key string, opts *driver.SignedURLOptions) (string, error) {
return "", errNotImplemented
}
func (b *bucket) Close() error {
return nil
}
// reader should be able to read an AIP object from Storage Service using *http.Client.
type reader struct {
r io.ReadCloser
attrs driver.ReaderAttributes
}
func (r *reader) Read(p []byte) (int, error) {
return r.r.Read(p)
}
func (r *reader) Close() error {
return r.r.Close()
}
func (r *reader) Attributes() *driver.ReaderAttributes {
return &r.attrs
}
func (r *reader) As(i interface{}) bool {
return false
}