support bot, simplex-chat-nodejs: fix bot command parsing (#6964)

ciBotCommand's regex was unanchored, so a customer message like
"follow/read blog posts?" parsed as a /read command and the Grok
handler silently dropped the message. Anchor the regex with ^ so a
command requires `/` at the start of the (trimmed) message.

In the support bot, filter customer command parsing by the registered
keyword set: any unknown `/word` from a customer (e.g. /help) is now
routed as plain text instead of being silently dropped by Grok. This
also makes /grok when Grok is disabled behave consistently as text,
removing the previous ad-hoc workaround.

packages/simplex-chat-nodejs/src/util.ts

@@ -78,7 +78,7 @@ export interface BotCommand {
 export function ciBotCommand(chatItem: T.ChatItem): BotCommand | undefined {
   const msg = ciContentText(chatItem)?.trim()
   if (msg) {
-    const r = msg.match(/\/([^\s]+)(.*)/)
+    const r = msg.match(/^\/([^\s]+)(.*)/)
     if (r && r.length >= 3) {
       return {keyword: r[1], params: r[2].trim()}
     }

packages/simplex-chat-nodejs/tests/util.test.ts

@@ -0,0 +1,37 @@
+import {T} from "@simplex-chat/types"
+import {ciBotCommand} from "../src/util"
+
+function rcvText(text: string): T.ChatItem {
+  return {content: {type: "rcvMsgContent", msgContent: {type: "text", text}}} as T.ChatItem
+}
+
+describe("ciBotCommand", () => {
+  it("parses a command at the start of the message", () => {
+    expect(ciBotCommand(rcvText("/grok hello"))).toEqual({keyword: "grok", params: "hello"})
+  })
+
+  it("returns undefined for a slash in the middle of a word", () => {
+    expect(ciBotCommand(rcvText("What follow/read blog posts?"))).toBeUndefined()
+  })
+
+  it("returns undefined for a slash after a space", () => {
+    expect(ciBotCommand(rcvText("see /home for details"))).toBeUndefined()
+  })
+
+  it("strips leading whitespace before matching", () => {
+    expect(ciBotCommand(rcvText("   /grok ask this"))).toEqual({keyword: "grok", params: "ask this"})
+  })
+
+  it("returns command with empty params when only the keyword is present", () => {
+    expect(ciBotCommand(rcvText("/team"))).toEqual({keyword: "team", params: ""})
+  })
+
+  it("returns undefined for plain text without slash", () => {
+    expect(ciBotCommand(rcvText("hello there"))).toBeUndefined()
+  })
+
+  it("returns undefined for non-text chat item content", () => {
+    const ci = {content: {type: "rcvDeleted"}} as T.ChatItem
+    expect(ciBotCommand(ci)).toBeUndefined()
+  })
+})