Backend Todo1

server/api.js

@@ -1,6 +1,9 @@
 const express = require("express");
 const bodyParser = require("body-parser");
 const Wallet = require("./wallet");
+const Transaction = require("./transaction")
+const Blockchain = require("./blockchain");
+const Block = require("./block");
 
 //get the port from the user or set the default port
 const HTTP_PORT = process.env.HTTP_PORT || 3001;
@@ -29,3 +32,23 @@ app.post("/mine", (req, res) => {
 app.listen(HTTP_PORT, () => {
   console.log(`listening on port ${HTTP_PORT}`);
 });
+
+app.post("/transact", (req, res) =>{
+  try{
+    const wallet=new Wallet(req.body.senderPrivateKey);
+    const trans=new Transaction();
+    trans.newTransaction(wallet, req.body.recipientPublicKey, req.body.amount);
+    const bc=Blockchain(Block.genesis());
+    bc.addBlock(trans);
+
+    res.json({
+      "status": 200,
+   });
+  }
+  catch(err) {
+    res.json({
+        "status": 400,
+        "error": err.message,
+     });
+  }
+});

server/blockchain.js

@@ -1,8 +1,9 @@
 const Block = require("./block.js");
+const mysql = require('mysql');
 
 class Blockchain {
-  constructor() {
-    this.chain = [Block.genesis()];
+  constructor(chain) {
+    this.chain = chain;
   }
 
   addBlock(data) {
@@ -12,6 +13,11 @@ class Blockchain {
     return block;
   }
 
+  /**
+   * Given a chain, return true if it is valid
+   * @param {array} chain
+   * @returns {boolean}
+   */
   isValidChain(chain) {
     if (JSON.stringify(chain[0]) !== JSON.stringify(Block.genesis()))
       return false;
@@ -22,7 +28,7 @@ class Blockchain {
       if (
         block.lastHash !== lastBlock.hash ||
         block.hash !== Block.blockHash(block)
-      )
+      ) 
         return false;
     }