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// Copyright 2021 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package lfs
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"net/http"
"code.gitea.io/gitea/modules/json"
"code.gitea.io/gitea/modules/log"
)
// TransferAdapter represents an adapter for downloading/uploading LFS objects
type TransferAdapter interface {
Name() string
Download(ctx context.Context, l *Link) (io.ReadCloser, error)
Upload(ctx context.Context, l *Link, p Pointer, r io.Reader) error
Verify(ctx context.Context, l *Link, p Pointer) error
}
// BasicTransferAdapter implements the "basic" adapter
type BasicTransferAdapter struct {
client *http.Client
}
// Name returns the name of the adapter
func (a *BasicTransferAdapter) Name() string {
return "basic"
}
// Download reads the download location and downloads the data
func (a *BasicTransferAdapter) Download(ctx context.Context, l *Link) (io.ReadCloser, error) {
resp, err := a.performRequest(ctx, "GET", l, nil, nil)
if err != nil {
return nil, err
}
return resp.Body, nil
}
// Upload sends the content to the LFS server
func (a *BasicTransferAdapter) Upload(ctx context.Context, l *Link, p Pointer, r io.Reader) error {
_, err := a.performRequest(ctx, "PUT", l, r, func(req *http.Request) {
if len(req.Header.Get("Content-Type")) == 0 {
req.Header.Set("Content-Type", "application/octet-stream")
}
if req.Header.Get("Transfer-Encoding") == "chunked" {
req.TransferEncoding = []string{"chunked"}
}
req.ContentLength = p.Size
})
if err != nil {
return err
}
return nil
}
// Verify calls the verify handler on the LFS server
func (a *BasicTransferAdapter) Verify(ctx context.Context, l *Link, p Pointer) error {
b, err := json.Marshal(p)
if err != nil {
log.Error("Error encoding json: %v", err)
return err
}
_, err = a.performRequest(ctx, "POST", l, bytes.NewReader(b), func(req *http.Request) {
req.Header.Set("Content-Type", MediaType)
})
if err != nil {
return err
}
return nil
}
func (a *BasicTransferAdapter) performRequest(ctx context.Context, method string, l *Link, body io.Reader, callback func(*http.Request)) (*http.Response, error) {
log.Trace("Calling: %s %s", method, l.Href)
req, err := http.NewRequestWithContext(ctx, method, l.Href, body)
if err != nil {
log.Error("Error creating request: %v", err)
return nil, err
}
for key, value := range l.Header {
req.Header.Set(key, value)
}
req.Header.Set("Accept", MediaType)
if callback != nil {
callback(req)
}
res, err := a.client.Do(req)
if err != nil {
select {
case <-ctx.Done():
return res, ctx.Err()
default:
}
log.Error("Error while processing request: %v", err)
return res, err
}
if res.StatusCode != http.StatusOK {
return res, handleErrorResponse(res)
}
return res, nil
}
func handleErrorResponse(resp *http.Response) error {
defer resp.Body.Close()
er, err := decodeResponseError(resp.Body)
if err != nil {
return fmt.Errorf("Request failed with status %s", resp.Status)
}
log.Trace("ErrorRespone: %v", er)
return errors.New(er.Message)
}
func decodeResponseError(r io.Reader) (ErrorResponse, error) {
var er ErrorResponse
err := json.NewDecoder(r).Decode(&er)
if err != nil {
log.Error("Error decoding json: %v", err)
}
return er, err
}
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