Download: Add Disabled, Originals, MediaRaw & MediaSidecar Flags #2234

Extends DownloadSettings with 4 additional options:
- Name: File name pattern for downloaded files (existed)
- Disabled: Disables downloads
- Originals: Only download files stored in "originals" folder
- MediaRaw: Include RAW image files
- MediaSidecar: Include metadata sidecar files (JSON, XMP, YAML)

pkg/rnd/validation.go

@@ -0,0 +1,100 @@
+package rnd
+
+import "strings"
+
+// ValidID checks if the string is a valid unique ID.
+func ValidID(s string, prefix byte) bool {
+	// Regular UUID.
+	if ValidUUID(s) {
+		return true
+	}
+
+	// Not a known GenerateUID format.
+	if len(s) != 16 {
+		return false
+	}
+
+	return EntityUID(s, prefix)
+}
+
+// ValidIDs checks if a slice of strings contains ValidIDs only.
+func ValidIDs(s []string, prefix byte) bool {
+	if len(s) < 1 {
+		return false
+	}
+
+	for _, id := range s {
+		if !ValidID(id, prefix) {
+			return false
+		}
+	}
+
+	return true
+}
+
+// EntityUID returns true if string is a unique id as generated by PhotoPrism.
+func EntityUID(s string, prefix byte) bool {
+	if len(s) != 16 {
+		return false
+	}
+
+	if !IsAlnum(s) {
+		return false
+	}
+
+	return prefix == 0 || s[0] == prefix
+}
+
+// ValidUUID tests if the string looks like a standard UUID.
+func ValidUUID(s string) bool {
+	return len(s) == 36 && IsHex(s)
+}
+
+// SanitizeUUID normalizes UUIDs found in XMP or Exif metadata.
+func SanitizeUUID(s string) string {
+	if s == "" {
+		return ""
+	}
+
+	s = strings.Replace(strings.TrimSpace(s), "\"", "", -1)
+
+	if start := strings.LastIndex(s, ":"); start != -1 {
+		s = s[start+1:]
+	}
+
+	if !ValidUUID(s) {
+		return ""
+	}
+
+	return strings.ToLower(s)
+}
+
+// IsAlnum returns true if the string only contains alphanumeric ascii chars without whitespace.
+func IsAlnum(s string) bool {
+	if s == "" {
+		return false
+	}
+
+	for _, r := range s {
+		if (r < 48 || r > 57) && (r < 97 || r > 122) {
+			return false
+		}
+	}
+
+	return true
+}
+
+// IsHex returns true if the string only contains hex numbers, dashes and letters without whitespace.
+func IsHex(s string) bool {
+	if s == "" {
+		return false
+	}
+
+	for _, r := range s {
+		if (r < 48 || r > 57) && (r < 97 || r > 102) && (r < 65 || r > 70) && r != 45 {
+			return false
+		}
+	}
+
+	return true
+}