refactor: dedupe extension lowercase helpers

extensions/feishu/src/bot-sender-name.ts

@@ -1,3 +1,4 @@
+import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/text-runtime";
 import { createFeishuClient } from "./client.js";
 import type { ResolvedFeishuAccount } from "./types.js";
 
@@ -37,7 +38,7 @@ function correctFeishuScopeInUrl(url: string): string {
 }
 
 function shouldSuppressPermissionErrorNotice(permissionError: FeishuPermissionError): boolean {
-  const message = permissionError.message.toLowerCase();
+  const message = normalizeLowercaseStringOrEmpty(permissionError.message);
   return IGNORED_PERMISSION_SCOPE_TOKENS.some((token) => message.includes(token));
 }
 

extensions/feishu/src/monitor.startup.ts

@@ -1,3 +1,4 @@
+import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/text-runtime";
 import type { RuntimeEnv } from "../runtime-api.js";
 import { probeFeishu } from "./probe.js";
 import type { ResolvedFeishuAccount } from "./types.js";
@@ -33,13 +34,12 @@ export type FeishuMonitorBotIdentity = {
 };
 
 function isTimeoutErrorMessage(message: string | undefined): boolean {
-  return !!(
-    message?.toLowerCase().includes("timeout") || message?.toLowerCase().includes("timed out")
-  );
+  const lower = normalizeLowercaseStringOrEmpty(message);
+  return lower.includes("timeout") || lower.includes("timed out");
 }
 
 function isAbortErrorMessage(message: string | undefined): boolean {
-  return message?.toLowerCase().includes("aborted") ?? false;
+  return normalizeLowercaseStringOrEmpty(message).includes("aborted");
 }
 
 export async function fetchBotIdentityForMonitor(

extensions/feishu/src/setup-surface.ts

@@ -12,6 +12,7 @@ import {
   type OpenClawConfig,
   type SecretInput,
 } from "openclaw/plugin-sdk/setup";
+import { normalizeOptionalLowercaseString } from "openclaw/plugin-sdk/text-runtime";
 import {
   inspectFeishuCredentials,
   resolveDefaultFeishuAccountId,
@@ -102,7 +103,7 @@ function isFeishuConfigured(cfg: OpenClawConfig, accountId?: string | null): boo
       return false;
     }
     const rec = value as Record<string, unknown>;
-    const source = normalizeString(rec.source)?.toLowerCase();
+    const source = normalizeOptionalLowercaseString(normalizeString(rec.source));
     const id = normalizeString(rec.id);
     if (source === "env" && id) {
       return Boolean(normalizeString(process.env[id]));

extensions/imessage/src/normalize.ts

@@ -47,7 +47,7 @@ export function normalizeIMessageHandle(raw: string): string {
       return "";
     }
     const value = trimmed.slice(prefix.length).trim();
-    return `${prefix.toLowerCase()}${value}`;
+    return `${normalizeLowercaseStringOrEmpty(prefix)}${value}`;
   }
   if (trimmed.includes("@")) {
     return normalizeLowercaseStringOrEmpty(trimmed);

extensions/imessage/src/probe.ts

@@ -3,6 +3,7 @@ import { loadConfig } from "openclaw/plugin-sdk/config-runtime";
 import { runCommandWithTimeout } from "openclaw/plugin-sdk/process-runtime";
 import type { RuntimeEnv } from "openclaw/plugin-sdk/runtime-env";
 import { detectBinary } from "openclaw/plugin-sdk/setup";
+import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/text-runtime";
 import { createIMessageRpcClient } from "./client.js";
 import { DEFAULT_IMESSAGE_PROBE_TIMEOUT_MS } from "./constants.js";
 
@@ -35,7 +36,7 @@ async function probeRpcSupport(cliPath: string, timeoutMs: number): Promise<RpcS
   try {
     const result = await runCommandWithTimeout([cliPath, "rpc", "--help"], { timeoutMs });
     const combined = `${result.stdout}\n${result.stderr}`.trim();
-    const normalized = combined.toLowerCase();
+    const normalized = normalizeLowercaseStringOrEmpty(combined);
     if (normalized.includes("unknown command") && normalized.includes("rpc")) {
       const fatal = {
         supported: false,

extensions/imessage/src/test-plugin.ts

@@ -21,7 +21,7 @@ function normalizeIMessageTestHandle(raw: string): string {
   }
   if (/^(chat_id:|chat_guid:|chat_identifier:)/i.test(trimmed)) {
     return trimmed.replace(/^(chat_id:|chat_guid:|chat_identifier:)/i, (match) =>
-      match.toLowerCase(),
+      normalizeLowercaseStringOrEmpty(match),
     );
   }
   if (trimmed.includes("@")) {

extensions/nextcloud-talk/src/approval-auth.ts

@@ -2,16 +2,16 @@ import {
   createResolvedApproverActionAuthAdapter,
   resolveApprovalApprovers,
 } from "openclaw/plugin-sdk/approval-auth-runtime";
+import { normalizeOptionalLowercaseString } from "openclaw/plugin-sdk/text-runtime";
 import { resolveNextcloudTalkAccount } from "./accounts.js";
 import type { CoreConfig } from "./types.js";
 
 function normalizeNextcloudTalkApproverId(value: string | number): string | undefined {
-  const normalized = String(value)
-    .trim()
-    .replace(/^(nextcloud-talk|nc-talk|nc):/i, "")
-    .trim()
-    .toLowerCase();
-  return normalized || undefined;
+  return normalizeOptionalLowercaseString(
+    String(value)
+      .trim()
+      .replace(/^(nextcloud-talk|nc-talk|nc):/i, ""),
+  );
 }
 
 export const nextcloudTalkApprovalAuth = createResolvedApproverActionAuthAdapter({

extensions/nextcloud-talk/src/channel.adapters.ts

@@ -39,11 +39,7 @@ export const nextcloudTalkSecurityAdapter = {
     resolveAllowFrom: (account) => account.config.allowFrom,
     policyPathSuffix: "dmPolicy",
     normalizeEntry: (raw) =>
-      raw
-        .trim()
-        .replace(/^(nextcloud-talk|nc-talk|nc):/i, "")
-        .trim()
-        .toLowerCase(),
+      normalizeLowercaseStringOrEmpty(raw.trim().replace(/^(nextcloud-talk|nc-talk|nc):/i, "")),
   }),
 };
 

extensions/nextcloud-talk/src/policy.ts

@@ -1,4 +1,5 @@
 import { resolveInboundMentionDecision } from "openclaw/plugin-sdk/channel-inbound";
+import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/text-runtime";
 import type {
   AllowlistMatch,
   ChannelGroupContext,
@@ -15,10 +16,7 @@ import {
 import type { NextcloudTalkRoomConfig } from "./types.js";
 
 function normalizeAllowEntry(raw: string): string {
-  return raw
-    .trim()
-    .toLowerCase()
-    .replace(/^(nextcloud-talk|nc-talk|nc):/i, "");
+  return normalizeLowercaseStringOrEmpty(raw.trim().replace(/^(nextcloud-talk|nc-talk|nc):/i, ""));
 }
 
 export function normalizeNextcloudTalkAllowlist(

extensions/nextcloud-talk/src/signature.ts

@@ -1,4 +1,5 @@
 import { createHmac, randomBytes } from "node:crypto";
+import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/text-runtime";
 import type { NextcloudTalkWebhookHeaders } from "./types.js";
 
 const SIGNATURE_HEADER = "x-nextcloud-talk-signature";
@@ -41,7 +42,7 @@ export function extractNextcloudTalkHeaders(
   headers: Record<string, string | string[] | undefined>,
 ): NextcloudTalkWebhookHeaders | null {
   const getHeader = (name: string): string | undefined => {
-    const value = headers[name] ?? headers[name.toLowerCase()];
+    const value = headers[name] ?? headers[normalizeLowercaseStringOrEmpty(name)];
     return Array.isArray(value) ? value[0] : value;
   };
 

extensions/openai/openai-codex-provider.ts

@@ -19,7 +19,7 @@ import {
 } from "openclaw/plugin-sdk/provider-model-shared";
 import { buildProviderStreamFamilyHooks } from "openclaw/plugin-sdk/provider-stream-family";
 import { fetchCodexUsage } from "openclaw/plugin-sdk/provider-usage";
-import { readStringValue } from "openclaw/plugin-sdk/text-runtime";
+import { normalizeLowercaseStringOrEmpty, readStringValue } from "openclaw/plugin-sdk/text-runtime";
 import { OPENAI_CODEX_DEFAULT_MODEL } from "./default-models.js";
 import { resolveCodexAuthIdentity } from "./openai-codex-auth-identity.js";
 import { buildOpenAICodexProvider } from "./openai-codex-catalog.js";
@@ -110,7 +110,7 @@ function resolveCodexForwardCompatModel(
   ctx: ProviderResolveDynamicModelContext,
 ): ProviderRuntimeModel | undefined {
   const trimmedModelId = ctx.modelId.trim();
-  const lower = trimmedModelId.toLowerCase();
+  const lower = normalizeLowercaseStringOrEmpty(trimmedModelId);
 
   let templateIds: readonly string[];
   let patch: Partial<ProviderRuntimeModel> | undefined;

extensions/openai/openai-provider.ts

@@ -10,6 +10,7 @@ import {
   type ProviderPlugin,
 } from "openclaw/plugin-sdk/provider-model-shared";
 import { buildProviderStreamFamilyHooks } from "openclaw/plugin-sdk/provider-stream-family";
+import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/text-runtime";
 import { applyOpenAIConfig, OPENAI_DEFAULT_MODEL } from "./default-models.js";
 import { buildOpenAIReplayPolicy } from "./replay-policy.js";
 import {
@@ -106,7 +107,7 @@ function resolveOpenAIGpt54ForwardCompatModel(
   ctx: ProviderResolveDynamicModelContext,
 ): ProviderRuntimeModel | undefined {
   const trimmedModelId = ctx.modelId.trim();
-  const lower = trimmedModelId.toLowerCase();
+  const lower = normalizeLowercaseStringOrEmpty(trimmedModelId);
   let templateIds: readonly string[];
   let patch: Partial<ProviderRuntimeModel>;
   if (lower === OPENAI_GPT_54_MODEL_ID) {
@@ -252,7 +253,7 @@ export function buildOpenAIProvider(): ProviderPlugin {
     suppressBuiltInModel: (ctx) => {
       if (
         !SUPPRESSED_SPARK_PROVIDERS.has(normalizeProviderId(ctx.provider)) ||
-        ctx.modelId.toLowerCase() !== OPENAI_DIRECT_SPARK_MODEL_ID
+        normalizeLowercaseStringOrEmpty(ctx.modelId) !== OPENAI_DIRECT_SPARK_MODEL_ID
       ) {
         return undefined;
       }

extensions/openai/transport-policy.ts

@@ -5,6 +5,7 @@ import type {
   ProviderWebSocketSessionPolicy,
 } from "openclaw/plugin-sdk/plugin-entry";
 import { normalizeProviderId } from "openclaw/plugin-sdk/provider-model-shared";
+import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/text-runtime";
 import { isOpenAIApiBaseUrl, isOpenAICodexBaseUrl } from "./shared.js";
 
 const DEFAULT_OPENAI_WS_DEGRADE_COOLDOWN_MS = 60_000;
@@ -17,7 +18,7 @@ function isAzureOpenAIBaseUrl(baseUrl?: string): boolean {
     return false;
   }
   try {
-    return new URL(trimmed).hostname.toLowerCase().endsWith(".openai.azure.com");
+    return normalizeLowercaseStringOrEmpty(new URL(trimmed).hostname).endsWith(".openai.azure.com");
   } catch {
     return false;
   }

extensions/slack/src/approval-native.ts

@@ -35,7 +35,8 @@ function extractSlackSessionKind(
     return null;
   }
   const match = sessionKey.match(/slack:(direct|channel|group):/i);
-  return match?.[1] ? (match[1].toLowerCase() as "direct" | "channel" | "group") : null;
+  const kind = normalizeLowercaseStringOrEmpty(match?.[1]);
+  return kind ? (kind as "direct" | "channel" | "group") : null;
 }
 
 function normalizeComparableTarget(value: string): string {

extensions/slack/src/monitor/channel-config.ts

@@ -5,6 +5,7 @@ import {
   type ChannelMatchSource,
 } from "openclaw/plugin-sdk/channel-targets";
 import type { SlackReactionNotificationMode } from "openclaw/plugin-sdk/config-runtime";
+import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/text-runtime";
 import type { SlackMessageEvent } from "../types.js";
 import { allowListMatches, normalizeAllowListLower, normalizeSlackSlug } from "./allow-list.js";
 
@@ -108,7 +109,7 @@ export function resolveSlackChannelConfig(params: {
   // operators commonly write them in lowercase in their config. Add both
   // case variants so the lookup is case-insensitive without requiring a full
   // entry-scan. buildChannelKeyCandidates deduplicates identical keys.
-  const channelIdLower = channelId.toLowerCase();
+  const channelIdLower = normalizeLowercaseStringOrEmpty(channelId);
   const channelIdUpper = channelId.toUpperCase();
   const candidates = buildChannelKeyCandidates(
     channelId,

extensions/slack/src/monitor/context.ts

@@ -12,6 +12,7 @@ import { resolveAgentRoute } from "openclaw/plugin-sdk/routing";
 import { logVerbose } from "openclaw/plugin-sdk/runtime-env";
 import { getChildLogger } from "openclaw/plugin-sdk/runtime-env";
 import type { RuntimeEnv } from "openclaw/plugin-sdk/runtime-env";
+import { normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/text-runtime";
 import type { SlackMessageEvent } from "../types.js";
 import { normalizeAllowList, normalizeAllowListLower, normalizeSlackSlug } from "./allow-list.js";
 import type { SlackChannelConfigEntries } from "./channel-config.js";
@@ -314,7 +315,7 @@ export function createSlackMonitorContext(params: {
         p.channelName ? normalizeSlackSlug(p.channelName) : undefined,
       ]
         .filter((value): value is string => Boolean(value))
-        .map((value) => value.toLowerCase());
+        .map((value) => normalizeLowercaseStringOrEmpty(value));
       const permitted =
         groupDmChannelsLower.includes("*") ||
         candidates.some((candidate) => groupDmChannelsLower.includes(candidate));

extensions/slack/src/monitor/message-handler/prepare.ts

@@ -25,7 +25,10 @@ import { resolveAgentRoute } from "openclaw/plugin-sdk/routing";
 import { resolveThreadSessionKeys } from "openclaw/plugin-sdk/routing";
 import { logVerbose, shouldLogVerbose } from "openclaw/plugin-sdk/runtime-env";
 import { resolvePinnedMainDmOwnerFromAllowlist } from "openclaw/plugin-sdk/security-runtime";
-import { normalizeOptionalString } from "openclaw/plugin-sdk/text-runtime";
+import {
+  normalizeLowercaseStringOrEmpty,
+  normalizeOptionalString,
+} from "openclaw/plugin-sdk/text-runtime";
 import { resolveSlackReplyToMode, type ResolvedSlackAccount } from "../../accounts.js";
 import { reactSlackMessage } from "../../actions.js";
 import { hasSlackThreadParticipation } from "../../sent-thread-cache.js";
@@ -788,7 +791,7 @@ export async function prepareSlackMessage(params: {
             pinnedMainDmOwner && message.user
               ? {
                   ownerRecipient: pinnedMainDmOwner,
-                  senderRecipient: message.user.toLowerCase(),
+                  senderRecipient: normalizeLowercaseStringOrEmpty(message.user),
                   onSkip: ({ ownerRecipient, senderRecipient }) => {
                     logVerbose(
                       `slack: skip main-session last route for ${senderRecipient} (pinned owner ${ownerRecipient})`,