ooni-probe-cli/internal/engine/httpx/fetch.go

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package httpx
import (
"context"
"crypto/sha256"
"fmt"
)
// FetchResource fetches the specified resource and returns it.
func (c Client) FetchResource(ctx context.Context, URLPath string) ([]byte, error) {
request, err := c.NewRequest(ctx, "GET", URLPath, nil, nil)
if err != nil {
return nil, err
}
return c.Do(request)
}
// FetchResourceAndVerify fetches and verifies a specific resource.
func (c Client) FetchResourceAndVerify(ctx context.Context, URL, SHA256Sum string) ([]byte, error) {
c.Logger.Debugf("httpx: expected SHA256: %s", SHA256Sum)
data, err := c.FetchResource(ctx, URL)
if err != nil {
return nil, err
}
s := fmt.Sprintf("%x", sha256.Sum256(data))
c.Logger.Debugf("httpx: real SHA256: %s", s)
if SHA256Sum != s {
return nil, fmt.Errorf("httpx: SHA256 mismatch: got %s and expected %s", s, SHA256Sum)
}
return data, nil
}