feat: add arweave upload service

Author: PierreJeanjacquot

packages/sdk/src/config/config.ts

@@ -27,6 +27,8 @@ export const CHAIN_CONFIG: Record<ChainId, ChainConfig> = {
 };
 
 export const DEFAULT_CHAIN_ID = 134;
+export const DEFAULT_ARWEAVE_UPLOAD_API = 'http://localhost:3000'; // TODO change this
+export const DEFAULT_ARWEAVE_GATEWAY = 'https://arweave.net';
 export const DEFAULT_DATA_NAME = '';
 export const SCONE_TAG = ['tee', 'scone'];
 export const DEFAULT_MAX_PRICE = 0;

packages/sdk/src/services/arweave.ts

@@ -0,0 +1,58 @@
+import {
+  DEFAULT_ARWEAVE_GATEWAY,
+  DEFAULT_ARWEAVE_UPLOAD_API,
+} from '../config/config.js';
+
+interface AddOptions {
+  arweaveUploadApi?: string;
+  arweaveGateway?: string;
+}
+
+const add = async (
+  content: Uint8Array,
+  { arweaveGateway, arweaveUploadApi }: AddOptions = {}
+): Promise<string> => {
+  let arweaveId: string;
+
+  try {
+    const payload = new FormData();
+    payload.append('file', new Blob([content]));
+    const res = await fetch(
+      `${arweaveUploadApi || DEFAULT_ARWEAVE_UPLOAD_API}/upload`,
+      {
+        method: 'POST',
+        body: payload,
+      }
+    );
+    if (!res.ok) {
+      throw Error(`Arweave upload API answered with status ${res.status}`);
+    }
+    try {
+      const data = await res.json();
+      arweaveId = data?.arweaveId;
+      if (!arweaveId) {
+        throw Error('missing arweaveId');
+      }
+    } catch (e) {
+      throw Error('Arweave upload API answered with an invalid response', {
+        cause: e,
+      });
+    }
+  } catch (e) {
+    throw Error('Failed to add file on Arweave', { cause: e });
+  }
+  const publicUrl = `${arweaveGateway || DEFAULT_ARWEAVE_GATEWAY}/${arweaveId}`;
+  await fetch(publicUrl)
+    .then((res) => {
+      if (!res.ok) {
+        throw Error(`Arweave gateway answered with status ${res.status}`);
+      }
+    })
+    .catch((e) => {
+      throw Error(`Failed to load uploaded file at ${publicUrl}`, { cause: e });
+    });
+
+  return arweaveId;
+};
+
+export { add };