114 lines
3.0 KiB
Go
114 lines
3.0 KiB
Go
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package unfurlers
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import (
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"bytes"
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"errors"
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"fmt"
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"net/http"
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neturl "net/url"
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"regexp"
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"go.uber.org/zap"
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"github.com/status-im/status-go/images"
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"github.com/status-im/status-go/protocol/common"
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"github.com/status-im/status-go/protocol/protobuf"
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)
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const (
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maxImageSize = 1024 * 350
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)
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var imageURLRegexp = regexp.MustCompile(`(?i)^.+(png|jpg|jpeg|webp)$`)
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type ImageUnfurler struct {
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url *neturl.URL
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logger *zap.Logger
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httpClient *http.Client
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}
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func NewImageUnfurler(URL *neturl.URL, logger *zap.Logger, httpClient *http.Client) *ImageUnfurler {
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return &ImageUnfurler{
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url: URL,
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logger: logger,
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httpClient: httpClient,
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}
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}
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func compressImage(imgBytes []byte) ([]byte, error) {
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smallest := imgBytes
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img, err := images.DecodeImageData(imgBytes, bytes.NewReader(imgBytes))
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if err != nil {
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return nil, err
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}
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compressed := bytes.NewBuffer([]byte{})
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err = images.CompressToFileLimits(compressed, img, images.DefaultBounds)
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if err != nil {
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return nil, err
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}
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if len(compressed.Bytes()) < len(smallest) {
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smallest = compressed.Bytes()
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}
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if len(smallest) > maxImageSize {
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return nil, errors.New("image too large")
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}
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return smallest, nil
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}
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// IsSupportedImageURL detects whether a URL ends with one of the
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// supported image extensions. It provides a quick way to identify whether URLs
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// should be unfurled as images without needing to retrieve the full response
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// body first.
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func IsSupportedImageURL(url *neturl.URL) bool {
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return imageURLRegexp.MatchString(url.Path)
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}
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// isSupportedImage returns true when payload is one of the supported image
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// types. In the future, we should differentiate between animated and
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// non-animated WebP because, currently, only static WebP can be processed by
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// functions in the status-go/images package.
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func isSupportedImage(payload []byte) bool {
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return images.IsJpeg(payload) || images.IsPng(payload) || images.IsWebp(payload)
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}
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func (u *ImageUnfurler) Unfurl() (common.LinkPreview, error) {
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preview := newDefaultLinkPreview(u.url)
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preview.Type = protobuf.UnfurledLink_IMAGE
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headers := map[string]string{"user-agent": headerUserAgent}
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imgBytes, err := fetchBody(u.logger, u.httpClient, u.url.String(), headers)
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if err != nil {
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return preview, err
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}
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if !isSupportedImage(imgBytes) {
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return preview, fmt.Errorf("unsupported image type url='%s'", u.url.String())
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}
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compressedBytes, err := compressImage(imgBytes)
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if err != nil {
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return preview, fmt.Errorf("failed to compress image url='%s': %w", u.url.String(), err)
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}
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width, height, err := images.GetImageDimensions(compressedBytes)
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if err != nil {
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return preview, fmt.Errorf("could not get image dimensions url='%s': %w", u.url.String(), err)
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}
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dataURI, err := images.GetPayloadDataURI(compressedBytes)
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if err != nil {
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return preview, fmt.Errorf("could not build data URI url='%s': %w", u.url.String(), err)
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}
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preview.Thumbnail.Width = width
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preview.Thumbnail.Height = height
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preview.Thumbnail.DataURI = dataURI
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return preview, nil
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}
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