1 files changed, 83 insertions, 0 deletions
diff --git a/src/app/services/authentication/helpers.js b/src/app/services/authentication/helpers.js
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+++ b/src/app/services/authentication/helpers.js
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+/**
+ * Authentication helper functions.
+ * @module app/services/authentication/helpers
+ */
+
+import jsonwebtoken from "jsonwebtoken";
+import expressJwt from "express-jwt";
+import { createHmac, createHash, randomBytes } from "crypto";
+
+/**
+ * Generate a random secret
+ * @return {string} a random 64-byte secret token
+ */
+export const generateSecret = () => randomBytes(64).toString("hex");
+
+/**
+ * Store a password as SHA256 using the secret token
+ * @param  {string} plainPassword  the plaintext password
+ * @return {string} the sha256 of the password
+ */
+export const encryptPassword = (plainPassword) =>
+  createHmac("sha256", process.env.TOKEN_SECRET)
+    .update(plainPassword, "utf8")
+    .digest("hex");
+
+/**
+ * Generate a JSON web token with the desired payload.
+ * @param  {Object} payload  the object to attach to the JWT
+ * @return {string} a JSON web token
+ */
+export const generateAccessToken = (payload) =>
+  jsonwebtoken.sign(payload, process.env.TOKEN_SECRET);
+
+/**
+ * Middleware to encrypt any passwords before they hit the database.
+ */
+export const storeEncryptedPassword = (request, response, next) => {
+  if (request.body.password) {
+    request.body.password = encryptPassword(request.body.password);
+  }
+  next();
+};
+
+/**
+ * Hash a password, used in testing and when seeding the databse.
+ * Typically the passwords are hashed on the client side before being transmitted,
+ * and then hashed again before being inserted into the database.
+ * @param  {string}  plaintext  the plaintext password
+ * @return {string}  the SHA256 of the password
+ */
+export function hashPassword(plaintext) {
+  return createHash("sha256").update(plaintext, "utf8").digest("base64");
+}
+
+/**
+ * Express JWT middleware.
+ * @param {object} options  options to pass to express-jwt
+ * @return {Function} the express-jwt middleware
+ */
+export function checkAccessToken(options = {}) {
+  if (!process.env.TOKEN_SECRET) return null;
+  return expressJwt({
+    secret: process.env.TOKEN_SECRET,
+    algorithms: ["HS256"],
+    credentialsRequired: true,
+    ...options,
+  });
+}
+
+/**
+ * Middleware to check if a user is active before performing an API call.
+ */
+export async function checkUserIsActive(request, response, next) {
+  const User = request.bookshelf.model("User");
+  const user = await new User({
+    user_id: request.user.user_id,
+  }).fetch();
+  if (!user.get("is_active")) {
+    next(new Error("UserNotActive"));
+  } else {
+    next();
+  }
+}