Mantra tx crafting sdk (#175)

* mantra sdk example and sign fx

* remove ts ignore example mantra

* remove ts ignore example mantra

* remove restake rewards from example

* bump v4.0.5

examples/mantra.ts

@@ -0,0 +1,45 @@
+import { omToUom, Kiln } from '../src/kiln.ts';
+import fs from 'node:fs';
+import 'dotenv/config';
+import type { FireblocksIntegration } from '../src/fireblocks.ts';
+
+const apiSecret = fs.readFileSync(`${__dirname}/fireblocks_secret_prod.key`, 'utf8');
+
+const k = new Kiln({
+  baseUrl: process.env.KILN_API_URL as string,
+  apiToken: process.env.KILN_API_KEY as string,
+});
+
+const vault: FireblocksIntegration = {
+  provider: 'fireblocks',
+  fireblocksApiKey: process.env.FIREBLOCKS_API_KEY as string,
+  fireblocksSecretKey: apiSecret,
+  vaultId: 17,
+};
+
+try {
+  console.log('crafting...');
+  const tx = await k.client.POST('/mantra/transaction/stake', {
+    body: {
+      account_id: process.env.KILN_ACCOUNT_ID as string,
+      pubkey: '028dfa6f41c655e38a0f8f2e3f3aa3e1246907a9bb299933f11996e2a345a21e10',
+      validator: 'mantravaloper146mj09yzu3mvz7pmy4dvs4z9wr2mst7ram37xw',
+      amount_uom: omToUom('0.01').toString(),
+    },
+  });
+
+  console.log(tx);
+  console.log('signing...');
+  if (!tx.data?.data) throw new Error('No data in response');
+  const signResponse = await k.fireblocks.signMantraTx(vault, tx.data.data);
+  console.log('broadcasting...');
+  if (!signResponse.signed_tx?.data?.signed_tx_serialized) throw new Error('No signed_tx in response');
+  const broadcastedTx = await k.client.POST('/mantra/transaction/broadcast', {
+    body: {
+      tx_serialized: signResponse.signed_tx.data.signed_tx_serialized,
+    },
+  });
+  console.log(broadcastedTx);
+} catch (err) {
+  console.log(err);
+}

src/fireblocks.ts

@@ -345,6 +345,61 @@ export class FireblocksService {
     };
   }
 
+  /**
+   * Sign a MANTRA transaction on Fireblocks
+   */
+  async signMantraTx(
+    integration: FireblocksIntegration,
+    tx: components['schemas']['MANTRAUnsignedTx'] | components['schemas']['MANTRAStakeUnsignedTx'],
+    note?: string,
+  ): Promise<{
+    signed_tx: { data: components['schemas']['MANTRASignedTx'] };
+    fireblocks_tx: TransactionResponse;
+  }> {
+    const payload = {
+      rawMessageData: {
+        messages: [
+          {
+            content: tx.unsigned_tx_hash,
+            derivationPath: [44, 118, integration.vaultId, 0, 0],
+            preHash: {
+              content: tx.unsigned_tx_serialized,
+              hashAlgorithm: 'SHA256',
+            },
+          },
+        ],
+        algorithm: SigningAlgorithm.MPC_ECDSA_SECP256K1,
+      },
+    };
+
+    const fbSigner = this.getSigner(integration);
+    const fbNote = note ? note : 'MANTRA tx from @kilnfi/sdk';
+    const fbTx = await fbSigner.sign(payload, undefined, fbNote);
+    const signature = fbTx.signedMessages?.[0]?.signature.fullSig;
+
+    if (!signature) {
+      throw new Error('Fireblocks signature is missing');
+    }
+
+    const preparedTx = await this.client.POST('/mantra/transaction/prepare', {
+      body: {
+        pubkey: tx.pubkey,
+        tx_body: tx.tx_body,
+        tx_auth_info: tx.tx_auth_info,
+        signature: signature,
+      },
+    });
+
+    if (preparedTx.error) {
+      throw new Error('Failed to prepare transaction');
+    }
+
+    return {
+      signed_tx: preparedTx.data,
+      fireblocks_tx: fbTx,
+    };
+  }
+
   /**
    * Sign a INJ transaction on Fireblocks
    */

src/utils.ts

@@ -71,6 +71,13 @@ export const kavaToUkava = (kava: string): bigint => {
   return parseUnits(kava, 6);
 };
 
+/**
+ * Convert OM to uOM
+ */
+export const omToUom = (om: string): bigint => {
+  return parseUnits(om, 6);
+};
+
 /**
  * Convert uZETA to ZETA
  */
@@ -176,6 +183,13 @@ export const ukavaToKava = (ukava: bigint): string => {
   return formatUnits(ukava, 6);
 };
 
+/**
+ * Convert uOM to OM
+ */
+export const uomToOm = (uom: bigint): string => {
+  return formatUnits(uom, 6);
+};
+
 /**
  * Get a cosmos address from its public key and prefix
  * @param pubkey