refactor(media): centralize temp media dir path

pkg/channels/feishu/feishu_64.go

@@ -618,7 +618,7 @@ func (c *FeishuChannel) downloadResource(
 	}
 
 	// Write to the shared picoclaw_media directory using a unique name to avoid collisions.
-	mediaDir := filepath.Join(os.TempDir(), "picoclaw_media")
+	mediaDir := media.TempDir()
 	if mkdirErr := os.MkdirAll(mediaDir, 0o700); mkdirErr != nil {
 		logger.ErrorCF("feishu", "Failed to create media directory", map[string]any{
 			"error": mkdirErr.Error(),

pkg/channels/matrix/matrix.go

@@ -35,8 +35,6 @@ const (
 	roomKindCacheTTL           = 5 * time.Minute
 	roomKindCacheCleanupPeriod = 1 * time.Minute
 	roomKindCacheMaxEntries    = 2048
-
-	matrixMediaTempDirName = "picoclaw_media"
 )
 
 var matrixMentionHrefRegexp = regexp.MustCompile(`(?i)<a[^>]+href=["']([^"']+)["']`)
@@ -1105,7 +1103,7 @@ func (c *MatrixChannel) stripSelfMention(text string) string {
 }
 
 func matrixMediaTempDir() (string, error) {
-	mediaDir := filepath.Join(os.TempDir(), matrixMediaTempDirName)
+	mediaDir := media.TempDir()
 	if err := os.MkdirAll(mediaDir, 0o700); err != nil {
 		return "", err
 	}

pkg/channels/matrix/matrix_test.go

@@ -15,6 +15,7 @@ import (
 	"maunium.net/go/mautrix/id"
 
 	"github.com/sipeed/picoclaw/pkg/config"
+	"github.com/sipeed/picoclaw/pkg/media"
 )
 
 func TestMatrixLocalpartMentionRegexp(t *testing.T) {
@@ -165,7 +166,7 @@ func TestMatrixMediaTempDir(t *testing.T) {
 	if err != nil {
 		t.Fatalf("matrixMediaTempDir failed: %v", err)
 	}
-	if filepath.Base(dir) != matrixMediaTempDirName {
+	if filepath.Base(dir) != media.TempDirName {
 		t.Fatalf("unexpected media dir base: %q", filepath.Base(dir))
 	}
 

pkg/media/tempdir.go

@@ -0,0 +1,13 @@
+package media
+
+import (
+	"os"
+	"path/filepath"
+)
+
+const TempDirName = "picoclaw_media"
+
+// TempDir returns the shared temporary directory used for downloaded media.
+func TempDir() string {
+	return filepath.Join(os.TempDir(), TempDirName)
+}

pkg/utils/media.go

@@ -12,6 +12,7 @@ import (
 	"github.com/google/uuid"
 
 	"github.com/sipeed/picoclaw/pkg/logger"
+	"github.com/sipeed/picoclaw/pkg/media"
 )
 
 // IsAudioFile checks if a file is an audio file based on its filename extension and content type.
@@ -67,7 +68,7 @@ func DownloadFile(urlStr, filename string, opts DownloadOptions) string {
 		opts.LoggerPrefix = "utils"
 	}
 
-	mediaDir := filepath.Join(os.TempDir(), "picoclaw_media")
+	mediaDir := media.TempDir()
 	if err := os.MkdirAll(mediaDir, 0o700); err != nil {
 		logger.ErrorCF(opts.LoggerPrefix, "Failed to create media directory", map[string]any{
 			"error": err.Error(),