Use the SDK in Node.js

import { DirectSecp256k1HdWallet } from "@cosmjs/proto-signing";
import { Secp256k1HdWallet, makeSignDoc as makeAminoSignDoc } from "@cosmjs/amino";

export async function createNodeSigner(mnemonic: string) {
  const directWallet = await DirectSecp256k1HdWallet.fromMnemonic(mnemonic, { prefix: "lumera" });
  const aminoWallet = await Secp256k1HdWallet.fromMnemonic(mnemonic, { prefix: "lumera" });
  const [account] = await directWallet.getAccounts();

  const signer = {
    getAccounts: () => directWallet.getAccounts(),
    signDirect: (addr: string, doc: any) => directWallet.signDirect(addr, doc),
    signAmino: (addr: string, doc: any) => aminoWallet.signAmino(addr, doc),
    async signArbitrary(chainId: string, signerAddress: string, data: string) {
      const signDoc = makeAminoSignDoc(
        [{
          type: "sign/MsgSignData",
          value: {
            signer: signerAddress,
            data: Buffer.from(data).toString("base64"),
          },
        }],
        { gas: "0", amount: [] },
        "",
        "",
        0,
        0
      );
      const { signature } = await aminoWallet.signAmino(signerAddress, signDoc);
      return { signed: data, signature: signature.signature, pub_key: signature.pub_key };
    },
  };

  return { signer, account };
}

import fs from "node:fs";
import { createLumeraClient } from "@lumera-protocol/sdk-js";
import { createNodeSigner } from "./signer";

const { signer, account } = await createNodeSigner(process.env.LUMERA_MNEMONIC!);

const client = await createLumeraClient({
  preset: "testnet",
  signer: signer as any,
  address: account.address,
  gasPrice: "0.025ulume",
});

const file = await fs.promises.readFile("./my-document.pdf");
const expirationTime = String(Math.floor(Date.now() / 1000) + 24 * 60 * 60);

const result = await client.Cascade.uploader.uploadFile(new Uint8Array(file), {
  fileName: "my-document.pdf",
  isPublic: true,
  expirationTime,
  taskOptions: { pollInterval: 2000, timeout: 300000 },
});

console.log("Stored with action ID:", result.action_id);

import fs from "node:fs";
import { createLumeraClient } from "@lumera-protocol/sdk-js";
import { createNodeSigner } from "./signer";

const { signer, account } = await createNodeSigner(process.env.LUMERA_MNEMONIC!);

const client = await createLumeraClient({
  preset: "testnet",
  signer: signer as any,
  address: account.address,
  gasPrice: "0.025ulume",
});

const stream = await client.Cascade.downloader.download("your-action-id");
const reader = stream.getReader();
const chunks: Uint8Array[] = [];

while (true) {
  const { done, value } = await reader.read();
  if (done) break;
  if (value) chunks.push(value);
}

const fileBytes = new Uint8Array(chunks.reduce((acc, c) => acc + c.length, 0));
let offset = 0;
for (const chunk of chunks) {
  fileBytes.set(chunk, offset);
  offset += chunk.length;
}

await fs.promises.writeFile("./downloaded-file.pdf", fileBytes);