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rest_api.js
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rest_api.js
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// import required node js libraries
const fs = require("fs");
const path = require("path");
const express = require("express");
const jwt = require("jsonwebtoken");
const bodyParser = require("body-parser");
const https = require("https");
var crypto = require("crypto");
// import fabric node sdk helper functions
const enrollAdmin = require("./fabric_node_sdk_helper/enrollAdmin");
const registerUser = require("./fabric_node_sdk_helper/registerUser");
const querychaincode = require("./fabric_node_sdk_helper/query");
const invokechaincode = require("./fabric_node_sdk_helper/invoke");
const { load_certificates_from_wallet } = require("./fileread");
const { sqlite_json_insert } = require("./db_query");
// Global variables;
const API_CONFIG_FILE = "api_config.json";
const DB_NAME = "rest_api_db.sqlite";
const WALLET_DIRECTORY = "./wallet";
// Global variable to store the api config from file
let apiConfigJson;
// Load api config from json file
try {
const apiConfigFilePath = path.resolve(__dirname, ".", API_CONFIG_FILE);
const apiConfigFileContent = fs.readFileSync(apiConfigFilePath, "utf8");
apiConfigJson = JSON.parse(apiConfigFileContent);
console.log(apiConfigJson);
} catch (e) {
console.log(e);
throw Error("API Start Error - Error while reading API config", e);
}
// Declare a express app object
const app = express();
// Body-parser - to support JSON-encoded bodies
app.use(express.json());
app.use(
express.urlencoded({
// to support URL-encoded bodies
extended: true,
})
);
app.get("/", (req, res) => res.send("tic Restful Api"));
app.post("/jwt", (req, res) => {
let jsonResponse = {};
let postRequestData;
try {
postRequestData = req.body;
console.log("postRequestData");
if (
postRequestData["Rest_Api_Admin_User_Name"] ===
apiConfigJson["rest_api_admin_user_name"] &&
postRequestData["Rest_Api_Admin_Password"] ===
apiConfigJson["rest_api_admin_password"]
) {
console.log("inside if");
let privateKey =
apiConfigJson["rest_api_admin_user_name"] +
apiConfigJson["rest_api_admin_password"];
let privateKeyHash = crypto
.createHash("md5")
.update(privateKey)
.digest("hex");
console.log(privateKeyHash);
let token = jwt.sign({ body: "stuff" }, privateKeyHash, {
algorithm: "HS256",
});
jsonResponse["status"] = "success";
jsonResponse["response"] = token;
} else {
jsonResponse["status"] = "fail";
jsonResponse["error"] = "Not Authorised - User Name and Password wrong";
}
} catch (error) {
jsonResponse["status"] = "fail";
jsonResponse["error"] = error;
} finally {
console.log("########### jwt Response #################");
console.log(jsonResponse);
res.json(jsonResponse);
}
});
app.post("/register", isAuthorized, async (req, res) => {
console.log("inside register");
let postRequestData;
let registerStatus = "success";
let registeredUserInfo;
let fabricRegisterStatus;
let jsonResponse = {};
try {
postRequestData = req.body;
console.log(postRequestData);
fabricRegisterStatus = JSON.parse(
await registerUser(
postRequestData["User_Name"],
postRequestData["User_Password"],
postRequestData["User_Role"]
)
);
console.log(fabricRegisterStatus);
if (fabricRegisterStatus["registerStatus"].includes("success")) {
let userCertificatesJson = await load_certificates_from_wallet(
postRequestData["User_Name"]
);
let currentTimestamp = { Registered_Timestamp: new Date() };
registeredUserInfo = {
...postRequestData,
...userCertificatesJson,
...currentTimestamp,
};
let insertStatus = await sqlite_json_insert(
DB_NAME,
registeredUserInfo,
"User"
);
registerStatus = insertStatus;
jsonResponse["status"] = registerStatus;
registeredUserInfo["registerStatus"] =
fabricRegisterStatus["registerStatus"];
jsonResponse["response"] = registeredUserInfo;
} else {
jsonResponse["status"] = "fail";
jsonResponse["response"] = fabricRegisterStatus;
}
} catch (e) {
console.log(e);
registerStatus = e;
jsonResponse["status"] = "fail";
jsonResponse["error"] = e;
} finally {
res.json(jsonResponse);
}
});
app.post("/query", isAuthorized, async (req, res) => {
let jsonResponse = {};
let postRequestData;
try {
postRequestData = req.body;
console.log(postRequestData);
let functionArguments = generate_function_arguments(postRequestData);
let fabricQueryResult = await querychaincode.apply(this, functionArguments);
jsonResponse["status"] = "success";
jsonResponse["response"] = JSON.parse(fabricQueryResult);
} catch (e) {
console.log(e);
jsonResponse["status"] = "fail";
jsonResponse["error"] = e;
} finally {
res.json(jsonResponse);
}
});
app.post("/invoke", isAuthorized, async (req, res) => {
let jsonResponse = {};
let postRequestData;
try {
postRequestData = req.body;
console.log(postRequestData);
let functionArguments = generate_function_arguments(postRequestData);
let fabricInvokeResult = await invokechaincode.apply(
this,
functionArguments
);
jsonResponse["status"] = "success";
jsonResponse["response"] = fabricInvokeResult;
} catch (e) {
console.log(e);
jsonResponse["status"] = "fail";
jsonResponse["error"] = e;
} finally {
res.json(jsonResponse);
}
});
function generate_function_arguments(postRequestData) {
let functionArguments = [];
functionArguments.push(apiConfigJson["rest_api_admin_user_name"]);
functionArguments.push(postRequestData["Channel_Name"]);
functionArguments.push(postRequestData["Chaincode_Name"]);
functionArguments.push(postRequestData["Chaincode_Function_Name"]);
let chaincodeFunctionArguments = JSON.parse(
postRequestData["Chaincode_Function_Json_Arguments"]
);
console.log("chaincodeFunctionArguments");
console.log(chaincodeFunctionArguments);
if (Array.isArray(chaincodeFunctionArguments)) {
functionArguments.push(...chaincodeFunctionArguments);
} else {
functionArguments.push(chaincodeFunctionArguments);
}
console.log("functionArguments");
console.log(functionArguments);
return functionArguments;
}
function isAuthorized(req, res, next) {
if (typeof req.headers.authorization !== "undefined") {
// retrieve the authorization header and parse out the
// JWT using the split function
let token = req.headers.authorization.split(" ")[1];
// Generate rest api privateKeyHash to generate token
let privateKey =
apiConfigJson["rest_api_admin_user_name"] +
apiConfigJson["rest_api_admin_password"];
let privateKeyHash = crypto
.createHash("md5")
.update(privateKey)
.digest("hex");
console.log(privateKeyHash);
// Here we validate that the JSON Web Token is valid and has been
// created using the same private pass phrase
jwt.verify(token, privateKeyHash, { algorithm: "HS256" }, (err, user) => {
// if there has been an error...
if (err) {
// shut them out!
res.status(500).json({ error: "Not Authorized" });
}
// if the JWT is valid, allow them to hit
// the intended endpoint
return next();
});
} else {
// No authorization header exists on the incoming
// request, return not authorized
res.status(500).json({ error: "Not Authorized" });
}
}
async function enrollAdminUserForFabricClient() {
let adminWalletDirectory = WALLET_DIRECTORY + "/admin";
if (fs.existsSync(adminWalletDirectory)) {
console.log("Admin User wallet exists.");
} else {
console.log("Admin User wallet Directory does not exists.");
const admin_enroll_status = await enrollAdmin(
apiConfigJson["fabric_ca_admin_user_name"],
apiConfigJson["fabric_ca_admin_password"],
apiConfigJson["fabric_organisation_msp_name"],
apiConfigJson["fabric_ca_organisation_name"]
);
console.log(admin_enroll_status);
}
}
async function registerRestApiAdminUser() {
let restApiAdminUserWalletDirectory =
WALLET_DIRECTORY + "/" + apiConfigJson["rest_api_admin_user_name"];
if (fs.existsSync(restApiAdminUserWalletDirectory)) {
console.log("Rest Api Admin User wallet Directory exists.");
} else {
console.log("Rest Api Admin User wallet Directory does not exist.");
const apiAdminUserRegisterStatus = await registerUser(
apiConfigJson["rest_api_admin_user_name"],
apiConfigJson["rest_api_admin_password"],
apiConfigJson["rest_api_admin_user_role"]
);
console.log(apiAdminUserRegisterStatus);
}
}
function startHttpsServer() {
// Setting up https
var options = {
key: fs.readFileSync(
"./fabric_node_sdk_helper/hlft-store/orgca/admin1/msp/keystore/server.key"
),
cert: fs.readFileSync(
"./fabric_node_sdk_helper/hlft-store/orgca/admin1/msp/signcerts/cert.pem"
),
ca: fs.readFileSync(
"./fabric_node_sdk_helper/hlft-store/orgca/admin1/msp/cacerts/orgca-7054.pem"
),
};
const port = apiConfigJson["rest_api_port"];
var server = https.createServer(options, app);
server.listen(port, function () {
console.log(`Rest Api listening on port ${port}!`);
});
}
function startHttpServer() {
const port = apiConfigJson["rest_api_port"];
app.listen(port, () => console.log(`Rest Api listening on port ${port}!`));
}
async function main() {
try {
await enrollAdminUserForFabricClient();
await registerRestApiAdminUser();
} catch (error) {
throw Error("API Start Error - Error while enrolling admin", e);
} finally {
if (apiConfigJson["enable_https"] === "y") {
startHttpsServer();
} else {
startHttpServer();
}
}
}
main();