Separate original and target account choices

backend/08-viewer.go

@@ -283,6 +283,7 @@ func findForwardedCopy(account, targetAccount string, raw []byte) (forwardedMatc
 	if id == "" {
 		return forwardedMatch{}, false
 	}
+	allowedTargets := targetMboxDirs(targetAccount)
 	entries, err := os.ReadDir(Cfg.MboxRoot)
 	if err != nil {
 		return forwardedMatch{}, false
@@ -291,7 +292,7 @@ func findForwardedCopy(account, targetAccount string, raw []byte) (forwardedMatc
 		if !entry.IsDir() || entry.Name() == account {
 			continue
 		}
-		if targetAccount != "" && entry.Name() != targetAccount {
+		if targetAccount != "" && !allowedTargets[entry.Name()] {
 			continue
 		}
 		mboxes, _ := filepath.Glob(filepath.Join(Cfg.MboxRoot, entry.Name(), "*.mbox"))
@@ -328,10 +329,7 @@ func messageIDHeader(raw []byte) string {
 }
 
 func renderTargetAccountSelect(account, folder, selected string, index int) string {
-	accounts := viewerAccounts()
+	options := targetAccountOptions()
-	if selected == account {
-		selected = ""
-	}
 	var b strings.Builder
 	fmt.Fprintf(&b, `<div class="pane-head target-head"><span>Zielkopie</span><form class="target-select-form"`)
 	if account != "" && folder != "" && index >= 0 {
@@ -343,15 +341,12 @@ func renderTargetAccountSelect(account, folder, selected string, index int) stri
 <input type="hidden" name="index" value="%d">
 <select id="target-account-select" name="target_account" class="target-select">
 <option value="">Automatisch</option>`, html.EscapeString(account), html.EscapeString(folder), index)
-	for _, a := range accounts {
+	for _, opt := range options {
-		if a.Name == account {
-			continue
-		}
 		attr := ""
-		if a.Name == selected {
+		if opt.Value == selected {
 			attr = ` selected`
 		}
-		fmt.Fprintf(&b, `<option value="%s"%s>%s</option>`, html.EscapeString(a.Name), attr, html.EscapeString(a.TargetLabel))
+		fmt.Fprintf(&b, `<option value="%s"%s>%s</option>`, html.EscapeString(opt.Value), attr, html.EscapeString(opt.Label))
 	}
 	b.WriteString(`</select></form></div>`)
 	return b.String()
@@ -360,7 +355,11 @@ func renderTargetAccountSelect(account, folder, selected string, index int) stri
 type viewerAccount struct {
 	Name        string
 	SourceLabel string
-	TargetLabel string
+}
+
+type targetAccountOption struct {
+	Value string
+	Label string
 }
 
 func viewerAccounts() []viewerAccount {
@@ -380,7 +379,7 @@ func viewerAccounts() []viewerAccount {
 		}
 		a := labels[entry.Name()]
 		if a.Name == "" {
-			a = viewerAccount{Name: entry.Name(), SourceLabel: entry.Name(), TargetLabel: entry.Name()}
+			a = viewerAccount{Name: entry.Name(), SourceLabel: entry.Name()}
 		}
 		out = append(out, a)
 	}
@@ -409,14 +408,45 @@ func accountLabels() map[string]viewerAccount {
 		if source == "" {
 			source = a.Name
 		}
-		target := a.DstUser
+		out[dir] = viewerAccount{Name: dir, SourceLabel: source}
-		if target == "" {
-			target = a.Name
 	}
-		if a.Name != "" {
+	return out
-			target = target + " (" + a.Name + ")"
+}
+
+func targetAccountOptions() []targetAccountOption {
+	if DB == nil {
+		return nil
+	}
+	accounts, err := ListAccounts()
+	if err != nil {
+		return nil
+	}
+	seen := map[string]bool{}
+	var out []targetAccountOption
+	for _, a := range accounts {
+		target := strings.TrimSpace(a.DstUser)
+		if target == "" || seen[target] {
+			continue
+		}
+		seen[target] = true
+		out = append(out, targetAccountOption{Value: target, Label: target})
+	}
+	return out
+}
+
+func targetMboxDirs(targetUser string) map[string]bool {
+	out := map[string]bool{}
+	if targetUser == "" || DB == nil {
+		return out
+	}
+	accounts, err := ListAccounts()
+	if err != nil {
+		return out
+	}
+	for _, a := range accounts {
+		if strings.EqualFold(strings.TrimSpace(a.DstUser), targetUser) {
+			out[accountMboxDir(a)] = true
 		}
-		out[dir] = viewerAccount{Name: dir, SourceLabel: source, TargetLabel: target}
 	}
 	return out
 }