fix: add telegram custom commands (#860) (thanks @nachoiacovino)

Co-authored-by: Nacho Iacovino <50103937+nachoiacovino@users.noreply.github.com>

src/config/telegram-custom-commands.ts

@@ -0,0 +1,93 @@
+export const TELEGRAM_COMMAND_NAME_PATTERN = /^[a-z0-9_]{1,32}$/;
+
+export type TelegramCustomCommandInput = {
+  command?: string | null;
+  description?: string | null;
+};
+
+export type TelegramCustomCommandIssue = {
+  index: number;
+  field: "command" | "description";
+  message: string;
+};
+
+export function normalizeTelegramCommandName(value: string): string {
+  const trimmed = value.trim();
+  if (!trimmed) return "";
+  const withoutSlash = trimmed.startsWith("/") ? trimmed.slice(1) : trimmed;
+  return withoutSlash.trim().toLowerCase();
+}
+
+export function normalizeTelegramCommandDescription(value: string): string {
+  return value.trim();
+}
+
+export function resolveTelegramCustomCommands(params: {
+  commands?: TelegramCustomCommandInput[] | null;
+  reservedCommands?: Set<string>;
+  checkReserved?: boolean;
+  checkDuplicates?: boolean;
+}): {
+  commands: Array<{ command: string; description: string }>;
+  issues: TelegramCustomCommandIssue[];
+} {
+  const entries = Array.isArray(params.commands) ? params.commands : [];
+  const reserved = params.reservedCommands ?? new Set<string>();
+  const checkReserved = params.checkReserved !== false;
+  const checkDuplicates = params.checkDuplicates !== false;
+  const seen = new Set<string>();
+  const resolved: Array<{ command: string; description: string }> = [];
+  const issues: TelegramCustomCommandIssue[] = [];
+
+  for (let index = 0; index < entries.length; index += 1) {
+    const entry = entries[index];
+    const normalized = normalizeTelegramCommandName(String(entry?.command ?? ""));
+    if (!normalized) {
+      issues.push({
+        index,
+        field: "command",
+        message: "Telegram custom command is missing a command name.",
+      });
+      continue;
+    }
+    if (!TELEGRAM_COMMAND_NAME_PATTERN.test(normalized)) {
+      issues.push({
+        index,
+        field: "command",
+        message: `Telegram custom command "/${normalized}" is invalid (use a-z, 0-9, underscore; max 32 chars).`,
+      });
+      continue;
+    }
+    if (checkReserved && reserved.has(normalized)) {
+      issues.push({
+        index,
+        field: "command",
+        message: `Telegram custom command "/${normalized}" conflicts with a native command.`,
+      });
+      continue;
+    }
+    if (checkDuplicates && seen.has(normalized)) {
+      issues.push({
+        index,
+        field: "command",
+        message: `Telegram custom command "/${normalized}" is duplicated.`,
+      });
+      continue;
+    }
+    const description = normalizeTelegramCommandDescription(String(entry?.description ?? ""));
+    if (!description) {
+      issues.push({
+        index,
+        field: "description",
+        message: `Telegram custom command "/${normalized}" is missing a description.`,
+      });
+      continue;
+    }
+    if (checkDuplicates) {
+      seen.add(normalized);
+    }
+    resolved.push({ command: normalized, description });
+  }
+
+  return { commands: resolved, issues };
+}