move downloader into own package

pkg/epoch/manifest.go

@@ -0,0 +1,51 @@
+package epoch
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+)
+
+const (
+	manifestUrl = "https://updater.project-epoch.net/api/v2/manifest"
+)
+
+type File struct {
+	Path   string `json:"Path"`
+	Hash   string `json:"Hash"`
+	Size   int    `json:"Size"`
+	Custom bool   `json:"Custom"`
+	Urls   struct {
+		Digitalocean string `json:"digitalocean"`
+		Cloudflare   string `json:"cloudflare"`
+		None         string `json:"none"`
+	} `json:"Urls"`
+}
+
+type Manifest struct {
+	Version   string `json:"Version"`
+	UID       string `json:"Uid"`
+	Files     []File `json:"Files"`
+	CheckedAt string `json:"checked_at"`
+}
+
+func GetManifest() (*Manifest, error) {
+	resp, err := http.Get(manifestUrl)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	var manifest Manifest
+	err = json.Unmarshal(data, &manifest)
+	if err != nil {
+		return nil, err
+	}
+
+	return &manifest, nil
+}