rename /src to /internal (sorry i'll fix the prs)

internal/ghupdate/release.go

@@ -0,0 +1,36 @@
+package ghupdate
+
+import (
+	"errors"
+	"strings"
+)
+
+type releaseAsset struct {
+	Name        string `json:"name"`
+	DownloadUrl string `json:"browser_download_url"`
+	Id          int    `json:"id"`
+	Size        int    `json:"size"`
+}
+
+type release struct {
+	Name      string          `json:"name"`
+	Tag       string          `json:"tag_name"`
+	Published string          `json:"published_at"`
+	Url       string          `json:"html_url"`
+	Body      string          `json:"body"`
+	Assets    []*releaseAsset `json:"assets"`
+	Id        int             `json:"id"`
+}
+
+// findAssetBySuffix returns the first available asset containing the specified suffix.
+func (r *release) findAssetBySuffix(suffix string) (*releaseAsset, error) {
+	if suffix != "" {
+		for _, asset := range r.Assets {
+			if strings.HasSuffix(asset.Name, suffix) {
+				return asset, nil
+			}
+		}
+	}
+
+	return nil, errors.New("missing asset containing " + suffix)
+}