81 lines
2.0 KiB
Go
81 lines
2.0 KiB
Go
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package unfurlers
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import (
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"context"
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"fmt"
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"io/ioutil"
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"net/http"
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neturl "net/url"
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"time"
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"go.uber.org/zap"
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"github.com/status-im/status-go/protocol/common"
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)
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const (
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DefaultRequestTimeout = 15000 * time.Millisecond
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headerAcceptJSON = "application/json; charset=utf-8"
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headerAcceptText = "text/html; charset=utf-8"
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// Without a particular user agent, many providers treat status-go as a
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// gluttony bot, and either respond more frequently with a 429 (Too Many
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// Requests), or simply refuse to return valid data. Note that using a known
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// browser UA doesn't work well with some providers, such as Spotify,
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// apparently they still flag status-go as a bad actor.
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headerUserAgent = "status-go/v0.151.15"
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// Currently set to English, but we could make this setting dynamic according
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// to the user's language of choice.
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headerAcceptLanguage = "en-US,en;q=0.5"
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)
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type Headers map[string]string
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type Unfurler interface {
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Unfurl() (common.LinkPreview, error)
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}
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func newDefaultLinkPreview(url *neturl.URL) common.LinkPreview {
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return common.LinkPreview{
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URL: url.String(),
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Hostname: url.Hostname(),
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}
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}
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func fetchBody(logger *zap.Logger, httpClient *http.Client, url string, headers Headers) ([]byte, error) {
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ctx, cancel := context.WithTimeout(context.Background(), DefaultRequestTimeout)
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defer cancel()
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req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
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if err != nil {
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return nil, fmt.Errorf("failed to perform HTTP request: %w", err)
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}
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for k, v := range headers {
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req.Header.Set(k, v)
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}
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res, err := 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() {
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if err := res.Body.Close(); err != nil {
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logger.Error("failed to close response body", zap.Error(err))
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}
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}()
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if res.StatusCode >= http.StatusBadRequest {
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return nil, fmt.Errorf("http request failed, statusCode='%d'", res.StatusCode)
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}
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bodyBytes, err := ioutil.ReadAll(res.Body)
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if err != nil {
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return nil, fmt.Errorf("failed to read body bytes: %w", err)
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}
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return bodyBytes, nil
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}
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