117 lines
2.8 KiB
Go
117 lines
2.8 KiB
Go
package repository
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import (
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"context"
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"encoding/json"
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"fmt"
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"io"
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"net/http"
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"os"
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"time"
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"github.com/Wei-Shaw/sub2api/internal/service"
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)
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type githubReleaseClient struct {
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httpClient *http.Client
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}
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func NewGitHubReleaseClient() service.GitHubReleaseClient {
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return &githubReleaseClient{
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httpClient: &http.Client{
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Timeout: 30 * time.Second,
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},
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}
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}
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func (c *githubReleaseClient) FetchLatestRelease(ctx context.Context, repo string) (*service.GitHubRelease, error) {
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url := fmt.Sprintf("https://api.github.com/repos/%s/releases/latest", repo)
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, 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.Set("Accept", "application/vnd.github.v3+json")
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req.Header.Set("User-Agent", "Sub2API-Updater")
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resp, err := c.httpClient.Do(req)
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if err != nil {
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return nil, err
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}
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defer func() { _ = resp.Body.Close() }()
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("GitHub API returned %d", resp.StatusCode)
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}
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var release service.GitHubRelease
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if err := json.NewDecoder(resp.Body).Decode(&release); err != nil {
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return nil, err
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}
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return &release, nil
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}
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func (c *githubReleaseClient) DownloadFile(ctx context.Context, url, dest string, maxSize int64) error {
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
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if err != nil {
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return err
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}
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client := &http.Client{Timeout: 10 * time.Minute}
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resp, err := client.Do(req)
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if err != nil {
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return err
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}
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defer func() { _ = resp.Body.Close() }()
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if resp.StatusCode != http.StatusOK {
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return fmt.Errorf("download returned %d", resp.StatusCode)
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}
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// SECURITY: Check Content-Length if available
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if resp.ContentLength > maxSize {
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return fmt.Errorf("file too large: %d bytes (max %d)", resp.ContentLength, maxSize)
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}
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out, err := os.Create(dest)
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if err != nil {
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return err
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}
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defer func() { _ = out.Close() }()
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// SECURITY: Use LimitReader to enforce max download size even if Content-Length is missing/wrong
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limited := io.LimitReader(resp.Body, maxSize+1)
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written, err := io.Copy(out, limited)
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if err != nil {
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return err
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}
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// Check if we hit the limit (downloaded more than maxSize)
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if written > maxSize {
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_ = os.Remove(dest) // Clean up partial file (best-effort)
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return fmt.Errorf("download exceeded maximum size of %d bytes", maxSize)
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}
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return nil
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}
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func (c *githubReleaseClient) FetchChecksumFile(ctx context.Context, url string) ([]byte, error) {
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
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if err != nil {
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return nil, err
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}
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resp, err := c.httpClient.Do(req)
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if err != nil {
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return nil, err
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}
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defer func() { _ = resp.Body.Close() }()
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("HTTP %d", resp.StatusCode)
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}
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return io.ReadAll(resp.Body)
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}
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