fix(dingtalk): strip leaked internal source handles

internal/channels/dingtalk/display_sanitizer.go

@@ -8,7 +8,11 @@ import (
 const displayReferenceMarkerPattern = `\[\[ref[\t ]+id[\t ]*=[\t ]*["']c[0-9]+["'][\t ]*\]\]`
 
 var (
-	displayReferenceMarkerRE      = regexp.MustCompile(displayReferenceMarkerPattern)
+	displayReferenceMarkerRE = regexp.MustCompile(displayReferenceMarkerPattern)
+	// bareInternalSourceHandleRE matches WeKnora request-local source aliases
+	// leaked by a model (for example [d21], [c12], or [w3]). It intentionally
+	// does not match ordinary Markdown links or arbitrary bracketed content.
+	bareInternalSourceHandleRE    = regexp.MustCompile(`(?i)\[(?:[dcw][0-9]+)(?:[	 ]*[,，][	 ]*(?:[dcw][0-9]+))*\]`)
 	leadingReferenceGroupColonRE  = regexp.MustCompile(`(?m)^[	 ]*(?:` + displayReferenceMarkerPattern + `[	 ]*)+[：:][	 ]*`)
 	spacedReferenceGroupRE        = regexp.MustCompile(`[	 ]+(?:` + displayReferenceMarkerPattern + `[	 ]*)+`)
 	spaceBeforeDisplayPunctuation = regexp.MustCompile(`[	 ]+([，。；：！？、,.;:!?])`)
@@ -19,12 +23,13 @@ func sanitizeDisplayAnswer(content string) string {
 	if index := strings.LastIndex(content, "[[ref"); index >= 0 && !strings.Contains(content[index:], "]]") {
 		content = content[:index]
 	}
-	if !displayReferenceMarkerRE.MatchString(content) {
+	if !displayReferenceMarkerRE.MatchString(content) && !bareInternalSourceHandleRE.MatchString(content) {
 		return content
 	}
 	content = leadingReferenceGroupColonRE.ReplaceAllString(content, "")
 	content = spacedReferenceGroupRE.ReplaceAllString(content, " ")
 	content = displayReferenceMarkerRE.ReplaceAllString(content, "")
+	content = bareInternalSourceHandleRE.ReplaceAllString(content, "")
 	content = spaceBeforeDisplayPunctuation.ReplaceAllString(content, "$1")
 	content = spaceAfterDisplayColon.ReplaceAllString(content, "$1")
 	return content

internal/channels/dingtalk/display_sanitizer_test.go

@@ -34,10 +34,20 @@ func TestSanitizeDisplayAnswerRemovesInternalReferenceMarkers(t *testing.T) {
 			want:  "Feature A remains supported.",
 		},
 		{
-			name:  "unrelated double bracket syntax is preserved",
+			name:  "unrelated double bracket syntax and ordinary link are preserved",
 			input: "请保留 [[wiki|页面名称]] 和 [普通链接](https://example.com)。",
 			want:  "请保留 [[wiki|页面名称]] 和 [普通链接](https://example.com)。",
 		},
+		{
+			name:  "bare internal source handles",
+			input: "Nova支持虚拟控制器离线仿真[d21]，并可搭配VX500[w3]。",
+			want:  "Nova支持虚拟控制器离线仿真，并可搭配VX500。",
+		},
+		{
+			name:  "grouped bare internal source handles",
+			input: "该结论由多个资料支持 [d21, c12，w3]。",
+			want:  "该结论由多个资料支持。",
+		},
 		{
 			name:  "content without references remains byte for byte unchanged",
 			input: "Protocol: value ; keep  spacing\n  indented",