72 lines
1.8 KiB
Go
72 lines
1.8 KiB
Go
package adapters
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import (
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"context"
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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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)
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const (
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// videoDownloadTimeout is the timeout for downloading video from URI.
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videoDownloadTimeout = 60 * time.Second
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// maxVideoSize is the maximum video size to download (500MB).
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maxVideoSize = 500 * 1024 * 1024
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)
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// downloadVideo fetches video bytes from a URL, streaming to a temp file first.
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// Uses explicit timeout and size limit (500MB) to prevent hangs and OOM.
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func downloadVideo(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, fmt.Errorf("create request: %w", err)
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}
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// Use client with explicit timeout (never use http.DefaultClient)
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httpClient := &http.Client{Timeout: videoDownloadTimeout}
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resp, err := httpClient.Do(req)
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if err != nil {
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return nil, fmt.Errorf("fetch video: %w", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("unexpected status %d", resp.StatusCode)
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}
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// Stream to temp file to avoid OOM on large videos
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tmpFile, err := os.CreateTemp("", "video-*.mp4")
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if err != nil {
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return nil, fmt.Errorf("create temp file: %w", err)
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}
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defer os.Remove(tmpFile.Name())
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defer tmpFile.Close()
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// Limit to maxVideoSize
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limitedReader := io.LimitReader(resp.Body, maxVideoSize)
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written, err := io.Copy(tmpFile, limitedReader)
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if err != nil {
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return nil, fmt.Errorf("write video to temp: %w", err)
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}
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if written == maxVideoSize {
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return nil, fmt.Errorf("video exceeds %dMB limit", maxVideoSize/(1024*1024))
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}
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// Seek back and read
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if _, err := tmpFile.Seek(0, 0); err != nil {
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return nil, fmt.Errorf("seek temp file: %w", err)
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}
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data, err := io.ReadAll(tmpFile)
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if err != nil {
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return nil, fmt.Errorf("read temp file: %w", err)
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}
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return data, nil
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}
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