初始提交：短剧库源码（含转码优化 ultrafast）

internal/app/playback_history_source.go

@@ -0,0 +1,17 @@
+package app
+
+import "strings"
+
+func playbackHistoryIdentity(id string) (string, string, bool) {
+	id = strings.TrimSpace(id)
+	if id == "" || len(id) > 512 || strings.ContainsAny(id, "\x00\r\n\t /\\?#") {
+		return "", "", false
+	}
+	if source, sourceID, ok := splitProviderDramaID(id); ok {
+		return providerDramaID(source, sourceID), source, true
+	}
+	if !strings.Contains(id, ":") {
+		return id, "cloudfront", true
+	}
+	return "", "", false
+}