caching icons automatically

internal/rendering/config.go

@@ -136,3 +136,12 @@ func (rc *Config) LoadConfigFile(file string) error {
 
 	return toml.Unmarshal(content, rc)
 }
+
+func (c *Config) Init() error {
+	for i, w := range c.Template.Websites {
+		c.Template.Websites[i].Cache()
+		fmt.Println(w.ImageUrl)
+	}
+
+	return nil
+}

internal/rendering/website_cards.go

@@ -1,7 +1,76 @@
 package rendering
 
+import (
+	"crypto/sha1"
+	"encoding/hex"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"os"
+	"path/filepath"
+)
+
 type Website struct {
-	Url      string
-	Name     string
-	ImageUrl string
+	Url       string
+	Name      string
+	ImageUrl  string
+	IsFetched bool
+}
+
+const CacheUrl = "cache"
+
+func GetCacheDir() (string, error) {
+	baseDir, err := os.UserCacheDir()
+	if err != nil {
+		return "", err
+	}
+	cacheDir := filepath.Join(baseDir, "startpage")
+	err = os.MkdirAll(cacheDir, 0o755)
+	if err != nil {
+		return "", err
+	}
+	return cacheDir, nil
+}
+
+func hashUrl(url string) string {
+	h := sha1.New()
+	io.WriteString(h, url)
+	return hex.EncodeToString(h.Sum(nil))
+}
+
+func (w *Website) Cache() error {
+	if w.IsFetched {
+		return nil
+	}
+
+	cacheDir, err := GetCacheDir()
+	if err != nil {
+		return err
+	}
+
+	filename := hashUrl(w.ImageUrl)
+	fmt.Println(w.ImageUrl + " => " + filename)
+	targetPath := filepath.Join(cacheDir, filename)
+	resp, err := http.Get(w.ImageUrl)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	file, err := os.Create(targetPath)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	_, err = io.Copy(file, resp.Body)
+
+	if err != nil {
+		return err
+	}
+
+	w.ImageUrl, _ = url.JoinPath(CacheUrl, filename)
+	w.IsFetched = true
+	return nil
 }

main.go

@@ -74,6 +74,11 @@ func main() {
 		fmt.Println(err)
 	}
 
+	err = CurrentConfig.Init()
+	if err != nil {
+		fmt.Println(err)
+	}
+
 	err = FetchDiyHrt()
 	if err != nil {
 		fmt.Println(err)
@@ -81,6 +86,14 @@ func main() {
 
 	e := echo.New()
 
+	// statically serve the file
+	cacheDir, err := rendering.GetCacheDir()
+	if err == nil {
+		e.Static("/cache", cacheDir)
+	} else {
+		fmt.Println(err)
+	}
+
 	// https://echo.labstack.com/docs/cookbook/embed-resources
 	staticHandler := http.FileServer(getFileSystem())
 	e.GET("/assets/*", echo.WrapHandler(http.StripPrefix("/", staticHandler)))

tmp/build-errors.log

@@ -1 +1 @@
-exit status 1exit status 1
+exit status 1exit status 1exit status 1exit status 1exit status 1exit status 1exit status 1exit status 1exit status 1exit status 1exit status 1exit status 1exit status 1exit status 1exit status 1exit status 1