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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"
- "encoding/json"
- "errors"
- "fmt"
- "io"
- "net/http"
- "net/url"
- "strings"
-
- "code.gitea.io/gitea/modules/log"
- )
-
- // HTTPClient is used to communicate with the LFS server
- // https://github.com/git-lfs/git-lfs/blob/main/docs/api/batch.md
- type HTTPClient struct {
- client *http.Client
- endpoint string
- transfers map[string]TransferAdapter
- }
-
- func newHTTPClient(endpoint *url.URL) *HTTPClient {
- hc := &http.Client{}
-
- client := &HTTPClient{
- client: hc,
- endpoint: strings.TrimSuffix(endpoint.String(), "/"),
- transfers: make(map[string]TransferAdapter),
- }
-
- basic := &BasicTransferAdapter{hc}
-
- client.transfers[basic.Name()] = basic
-
- return client
- }
-
- func (c *HTTPClient) transferNames() []string {
- keys := make([]string, len(c.transfers))
-
- i := 0
- for k := range c.transfers {
- keys[i] = k
- i++
- }
-
- return keys
- }
-
- func (c *HTTPClient) batch(ctx context.Context, operation string, objects []Pointer) (*BatchResponse, error) {
- url := fmt.Sprintf("%s/objects/batch", c.endpoint)
-
- request := &BatchRequest{operation, c.transferNames(), nil, objects}
-
- payload := new(bytes.Buffer)
- err := json.NewEncoder(payload).Encode(request)
- if err != nil {
- return nil, fmt.Errorf("lfs.HTTPClient.batch json.Encode: %w", err)
- }
-
- log.Trace("lfs.HTTPClient.batch NewRequestWithContext: %s", url)
-
- req, err := http.NewRequestWithContext(ctx, "POST", url, payload)
- if err != nil {
- return nil, fmt.Errorf("lfs.HTTPClient.batch http.NewRequestWithContext: %w", err)
- }
- req.Header.Set("Content-type", MediaType)
- req.Header.Set("Accept", MediaType)
-
- res, err := c.client.Do(req)
- if err != nil {
- select {
- case <-ctx.Done():
- return nil, ctx.Err()
- default:
- }
- return nil, fmt.Errorf("lfs.HTTPClient.batch http.Do: %w", err)
- }
- defer res.Body.Close()
-
- if res.StatusCode != http.StatusOK {
- return nil, fmt.Errorf("lfs.HTTPClient.batch: Unexpected servers response: %s", res.Status)
- }
-
- var response BatchResponse
- err = json.NewDecoder(res.Body).Decode(&response)
- if err != nil {
- return nil, fmt.Errorf("lfs.HTTPClient.batch json.Decode: %w", err)
- }
-
- if len(response.Transfer) == 0 {
- response.Transfer = "basic"
- }
-
- return &response, nil
- }
-
- // Download reads the specific LFS object from the LFS server
- func (c *HTTPClient) Download(ctx context.Context, oid string, size int64) (io.ReadCloser, error) {
- var objects []Pointer
- objects = append(objects, Pointer{oid, size})
-
- result, err := c.batch(ctx, "download", objects)
- if err != nil {
- return nil, err
- }
-
- transferAdapter, ok := c.transfers[result.Transfer]
- if !ok {
- return nil, fmt.Errorf("lfs.HTTPClient.Download Transferadapter not found: %s", result.Transfer)
- }
-
- if len(result.Objects) == 0 {
- return nil, errors.New("lfs.HTTPClient.Download: No objects in result")
- }
-
- content, err := transferAdapter.Download(ctx, result.Objects[0])
- if err != nil {
- return nil, err
- }
- return content, nil
- }
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