mirror of https://github.com/go-gitea/gitea
130 lines
3.0 KiB
Go
130 lines
3.0 KiB
Go
// Copyright 2021 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package lfs
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import (
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"bytes"
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"context"
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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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"net/http"
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"net/url"
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"strings"
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"code.gitea.io/gitea/modules/log"
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)
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// HTTPClient is used to communicate with the LFS server
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// https://github.com/git-lfs/git-lfs/blob/main/docs/api/batch.md
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type HTTPClient struct {
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client *http.Client
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endpoint string
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transfers map[string]TransferAdapter
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}
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func newHTTPClient(endpoint *url.URL) *HTTPClient {
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hc := &http.Client{}
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client := &HTTPClient{
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client: hc,
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endpoint: strings.TrimSuffix(endpoint.String(), "/"),
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transfers: make(map[string]TransferAdapter),
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}
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basic := &BasicTransferAdapter{hc}
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client.transfers[basic.Name()] = basic
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return client
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}
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func (c *HTTPClient) transferNames() []string {
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keys := make([]string, len(c.transfers))
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i := 0
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for k := range c.transfers {
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keys[i] = k
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i++
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}
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return keys
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}
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func (c *HTTPClient) batch(ctx context.Context, operation string, objects []Pointer) (*BatchResponse, error) {
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url := fmt.Sprintf("%s/objects/batch", c.endpoint)
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request := &BatchRequest{operation, c.transferNames(), nil, objects}
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payload := new(bytes.Buffer)
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err := json.NewEncoder(payload).Encode(request)
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if err != nil {
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return nil, fmt.Errorf("lfs.HTTPClient.batch json.Encode: %w", err)
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}
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log.Trace("lfs.HTTPClient.batch NewRequestWithContext: %s", url)
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req, err := http.NewRequestWithContext(ctx, "POST", url, payload)
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if err != nil {
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return nil, fmt.Errorf("lfs.HTTPClient.batch http.NewRequestWithContext: %w", err)
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}
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req.Header.Set("Content-type", MediaType)
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req.Header.Set("Accept", MediaType)
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res, err := c.client.Do(req)
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if err != nil {
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select {
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case <-ctx.Done():
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return nil, ctx.Err()
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default:
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}
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return nil, fmt.Errorf("lfs.HTTPClient.batch http.Do: %w", err)
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}
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defer res.Body.Close()
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if res.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("lfs.HTTPClient.batch: Unexpected servers response: %s", res.Status)
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}
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var response BatchResponse
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err = json.NewDecoder(res.Body).Decode(&response)
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if err != nil {
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return nil, fmt.Errorf("lfs.HTTPClient.batch json.Decode: %w", err)
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}
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if len(response.Transfer) == 0 {
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response.Transfer = "basic"
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}
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return &response, nil
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}
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// Download reads the specific LFS object from the LFS server
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func (c *HTTPClient) Download(ctx context.Context, oid string, size int64) (io.ReadCloser, error) {
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var objects []Pointer
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objects = append(objects, Pointer{oid, size})
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result, err := c.batch(ctx, "download", objects)
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if err != nil {
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return nil, err
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}
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transferAdapter, ok := c.transfers[result.Transfer]
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if !ok {
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return nil, fmt.Errorf("lfs.HTTPClient.Download Transferadapter not found: %s", result.Transfer)
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}
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if len(result.Objects) == 0 {
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return nil, errors.New("lfs.HTTPClient.Download: No objects in result")
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}
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content, err := transferAdapter.Download(ctx, result.Objects[0])
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if err != nil {
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return nil, err
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}
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return content, nil
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}
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