feat: add tlon channel plugin

extensions/tlon/src/urbit/send.ts

@@ -0,0 +1,114 @@
+import { unixToDa, formatUd } from "@urbit/aura";
+
+export type TlonPokeApi = {
+  poke: (params: { app: string; mark: string; json: unknown }) => Promise<unknown>;
+};
+
+type SendTextParams = {
+  api: TlonPokeApi;
+  fromShip: string;
+  toShip: string;
+  text: string;
+};
+
+export async function sendDm({ api, fromShip, toShip, text }: SendTextParams) {
+  const story = [{ inline: [text] }];
+  const sentAt = Date.now();
+  const idUd = formatUd(unixToDa(sentAt));
+  const id = `${fromShip}/${idUd}`;
+
+  const delta = {
+    add: {
+      memo: {
+        content: story,
+        author: fromShip,
+        sent: sentAt,
+      },
+      kind: null,
+      time: null,
+    },
+  };
+
+  const action = {
+    ship: toShip,
+    diff: { id, delta },
+  };
+
+  await api.poke({
+    app: "chat",
+    mark: "chat-dm-action",
+    json: action,
+  });
+
+  return { channel: "tlon", messageId: id };
+}
+
+type SendGroupParams = {
+  api: TlonPokeApi;
+  fromShip: string;
+  hostShip: string;
+  channelName: string;
+  text: string;
+  replyToId?: string | null;
+};
+
+export async function sendGroupMessage({
+  api,
+  fromShip,
+  hostShip,
+  channelName,
+  text,
+  replyToId,
+}: SendGroupParams) {
+  const story = [{ inline: [text] }];
+  const sentAt = Date.now();
+
+  const action = {
+    channel: {
+      nest: `chat/${hostShip}/${channelName}`,
+      action: replyToId
+        ? {
+            reply: {
+              id: replyToId,
+              delta: {
+                add: {
+                  memo: {
+                    content: story,
+                    author: fromShip,
+                    sent: sentAt,
+                  },
+                },
+              },
+            },
+          }
+        : {
+            post: {
+              add: {
+                content: story,
+                author: fromShip,
+                sent: sentAt,
+                kind: "/chat",
+                blob: null,
+                meta: null,
+              },
+            },
+          },
+    },
+  };
+
+  await api.poke({
+    app: "channels",
+    mark: "channel-action-1",
+    json: action,
+  });
+
+  return { channel: "tlon", messageId: `${fromShip}/${sentAt}` };
+}
+
+export function buildMediaText(text: string | undefined, mediaUrl: string | undefined): string {
+  const cleanText = text?.trim() ?? "";
+  const cleanUrl = mediaUrl?.trim() ?? "";
+  if (cleanText && cleanUrl) return `${cleanText}\n${cleanUrl}`;
+  if (cleanUrl) return cleanUrl;
+  return cleanText;
+}