fix(attachments): extend upload file size to form data (#1577)

Resolves https://github.com/go-vikunja/vikunja/issues/1494

pkg/config/config.go

@@ -31,6 +31,7 @@ import (
 
 	"code.vikunja.io/api/pkg/log"
 
+	"github.com/c2h5oh/datasize"
 	"github.com/spf13/viper"
 )
 
@@ -213,6 +214,8 @@ const (
 	PluginsDir     Key = `plugins.dir`
 )
 
+var maxFileSizeInBytes uint64
+
 // GetString returns a string config value
 func (k Key) GetString() string {
 	return viper.GetString(string(k))
@@ -622,6 +625,11 @@ func InitConfig() {
 
 	publicURL := strings.TrimSuffix(ServicePublicURL.GetString(), "/")
 	CorsOrigins.Set(append(CorsOrigins.GetStringSlice(), publicURL))
+
+	err = SetMaxFileSizeMBytesFromString(FilesMaxSize.GetString())
+	if err != nil {
+		log.Fatalf("Could not parse files.maxsize: %s", err)
+	}
 }
 
 func random(length int) (string, error) {
@@ -632,3 +640,21 @@ func random(length int) (string, error) {
 
 	return fmt.Sprintf("%X", b), nil
 }
+
+func SetMaxFileSizeMBytesFromString(size string) error {
+	var maxSize datasize.ByteSize
+	err := maxSize.UnmarshalText([]byte(size))
+	if err != nil {
+		return err
+	}
+
+	maxFileSizeInBytes = uint64(maxSize.MBytes())
+	return nil
+}
+
+func GetMaxFileSizeInMBytes() uint64 {
+	if maxFileSizeInBytes == 0 {
+		return 20
+	}
+	return maxFileSizeInBytes
+}