feat(app): add internal components batch 6

internal/app/media_playlist.go

@@ -0,0 +1,49 @@
+package app
+
+import (
+	"math"
+	"net/url"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func m3u8Duration(raw string) time.Duration {
+	var total time.Duration
+	for _, line := range strings.Split(raw, "\n") {
+		line = strings.TrimSpace(line)
+		if !strings.HasPrefix(line, "#EXTINF:") {
+			continue
+		}
+		value := strings.TrimSpace(strings.TrimPrefix(line, "#EXTINF:"))
+		if comma := strings.IndexByte(value, ','); comma >= 0 {
+			value = value[:comma]
+		}
+		seconds, err := strconv.ParseFloat(strings.TrimSpace(value), 64)
+		if err != nil || seconds < 0 || math.IsNaN(seconds) || math.IsInf(seconds, 0) {
+			continue
+		}
+		total += time.Duration(seconds * float64(time.Second))
+	}
+	return total
+}
+
+func rewriteM3U8(raw, playlistURL string) string {
+	base, err := url.Parse(playlistURL)
+	lines := strings.Split(raw, "\n")
+	for i, line := range lines {
+		trimmed := strings.TrimSpace(line)
+		if strings.Contains(trimmed, "URI=") && strings.Contains(trimmed, "/api/app/vid/sec") {
+			lines[i] = regexp.MustCompile(`URI="[^"]+"`).ReplaceAllString(line, `URI="key.bin"`)
+			continue
+		}
+		if err == nil && trimmed != "" && !strings.HasPrefix(trimmed, "#") && !strings.HasPrefix(trimmed, "http://") && !strings.HasPrefix(trimmed, "https://") {
+			ref, refErr := url.Parse(trimmed)
+			if refErr == nil {
+				lines[i] = base.ResolveReference(ref).String()
+			}
+		}
+	}
+	return strings.Join(lines, "\n")
+}