Docs: add username & password guide (#993)

* add user-password guide

* small changes

* move username-password file to guides

* fix links in username-password guide

web/docs/guides/username-password.md

@@ -0,0 +1,181 @@
+---
+title: Username & Password
+---
+
+import useBaseUrl from '@docusaurus/useBaseUrl';
+
+# Username & Password
+
+### Configuration
+
+To get started with a simple Username & Password Auth strategy, you'll need to add the Auth object with the following configuration to your `main.wasp` file:
+```c title="main.wasp"
+app Example {
+  wasp: {
+    version: "^0.11.0"
+  },
+
+  title: "Example",
+
+  auth: {
+    userEntity: User,
+    methods: {
+      usernameAndPassword: {},
+    },
+    onAuthFailedRedirectTo: "/login"
+  }
+}
+
+// Wasp requires the userEntity to have at least the following fields
+entity User {=psl
+    id                        Int           @id @default(autoincrement())
+    username                  String        @unique
+    password                  String
+psl=}
+
+// ...
+```
+For more info on the specific fields, check out this [Auth](/docs/language/features#authentication--authorization) section of the docs.
+
+If you're adding a new entity to your `.wasp` file for the first time, make sure to create the table for it in your database:
+```shell
+wasp db migrate-dev
+```
+
+You'll also need to add these environment variables to your `.env.server` file at the root of your project:
+
+```bash title=".env.server"
+JWT_SECRET=random-string-at-least-32-characters-long.
+```
+
+With `auth` now defined, Wasp offers a number of handy features out of the box:
+- ["AuthUI" Login and Signup forms](/docs/guides/auth-ui) located at `@wasp/auth/forms/Login` and `@wasp/auth/forms/Signup` paths, ready to be styled and used.
+- The `logout()` action.
+- The `useAuth()` hook to access the logged-in user client-side.
+- The `context.user` object as an argument server-side within [Operations](/docs/language/features#queries-and-actions-aka-operations).
+
+:::tip Customizing Auth
+This is a very high-level API for auth which makes it very easy to get started quickly, but is
+not very flexible. If you require more control (e.g. want to execute some custom code on the server
+during signup, check out the [lower-level auth API](/docs/language/features#lower-level-api).
+:::
+
+### Client-side
+
+To access the logged-in user client-side, you have two options:
+
+1. You can use the `user` object that Wasp passes to all pages by default:
+
+```jsx
+const Page = ({ user }) => {
+  const username = user.username
+
+  //...
+}
+```
+
+
+2. Use the `useAuth()` hook: 
+
+```jsx 
+import useAuth from '@wasp/auth/useAuth.js'
+
+const Page = () => {
+  const { data: user, isLoading, isError } = useAuth();
+
+  //...
+}
+```
+
+You can then do things like displaying some of the user information on the page. Here's an example:
+
+
+```jsx 
+import useAuth from '@wasp/auth/useAuth.js'
+import logout from '@wasp/auth/logout.js'
+import Todo from '../Todo.js'
+
+const Page = () => {
+  const { data: user } = useAuth()
+
+  return (
+    <>
+      <h1>Welcome {user.username}!</h1>
+      <Todo />
+      <button onClick={logout}>Logout</button>
+    </>
+  )
+}
+
+export default Page
+```
+
+You don't need to use the `useAuth()` hook if you're trying to protect a page from unauthorized users. Wasp takes care of that for you with its [higher-level API](/docs/language/features#authentication--authorization):
+
+```c title="main.wasp" {28}
+app Example {
+  wasp: {
+    version: "^0.8.0"
+  },
+
+  title: "Example",
+
+  auth: {
+    userEntity: User,
+    methods: {
+      usernameAndPassword: {},
+    },
+    onAuthFailedRedirectTo: "/login"
+  }
+}
+
+// Wasp requires the userEntity to have at least the following fields
+entity User {=psl
+    id                        Int           @id @default(autoincrement())
+    username                  String        @unique
+    password                  String
+psl=}
+
+// By adding `authRequired: true` to a page, Wasp will automatically
+// redirect unauthenticated users to the `onAuthFailedRedirectTo` route 
+route MainRoute { path: "/", to: MainPage }
+page MainPage {
+  authRequired: true,
+  component: import Main from "@client/MainPage"
+}
+
+route LoginRoute { path: "/login", to: LoginPage }
+page LoginPage {
+  component: import Login from "@client/LoginPage"
+}
+
+route SignupRoute { path: "/signup", to: SignupPage }
+page SignupPage {
+  component: import Signup from "@client/SignupPage"
+}
+```
+
+### Server-side
+
+To access the logged-in user server-side, you can use the `context.user` object within [Operations (i.e. *queries and actions*)](/docs/language/features#queries-and-actions-aka-operations):
+
+
+```js title="src/server/actions.js" {4}
+import HttpError from '@wasp/core/HttpError.js'
+
+export const createTask = async (task, context) => {
+  if (!context.user) {
+    throw new HttpError(401, 'You need to be logged in to create a task.')
+  }
+
+  return context.entities.Task.create({
+    data: {
+      description: task.description,
+      user: {
+        connect: { id: context.user.id }
+      }
+    }
+  })
+}
+```
+

web/docs/integrations/github.md

@@ -46,12 +46,18 @@ psl=}
 
 For more info on the specific fields, check out this [Auth](../language/features#social-login-providers-oauth-20) section of the docs.
 
+If you're adding a new entity to your `.wasp` file, make sure you migrate your database schema:
+```shell
+wasp db migrate-dev
+```
 
 You'll also need to add these environment variables to your `.env.server` file at the root of your project:
 
 ```bash title=".env.server"
 GITHUB_CLIENT_ID=your-github-client-id
 GITHUB_CLIENT_SECRET=your-github-client-secret
+
+JWT_SECRET=random-string-at-least-32-characters-long.
 ```
 We will cover how to get these values in the next section.
 

web/docs/integrations/google.md

@@ -46,12 +46,18 @@ psl=}
 
 For more info on the specific fields, check out this [Auth](../language/features#social-login-providers-oauth-20) section of the docs.
 
+If you're adding a new entity to your `.wasp` file, make sure you migrate your database schema:
+```shell
+wasp db migrate-dev
+```
 
 You'll also need to add these environment variables to your `.env.server` file at the root of your project:
 
 ```bash title=".env.server"
 GOOGLE_CLIENT_ID=your-google-client-id
 GOOGLE_CLIENT_SECRET=your-google-client-secret
+
+JWT_SECRET=random-string-at-least-32-characters-long.
 ```
 We will cover how to get these values in the next section.
 

web/docs/language/features.md

@@ -1072,7 +1072,7 @@ If you require more control in your authentication flow, you can achieve that in
 - If you want to execute custom code on the server during sign up, create your own sign up action which invokes Prisma client as `context.entities.[USER_ENTITY].create()` function, along with your custom code.
 
 The code of your custom sign-up action would look like this (your user entity being `User` in this instance):
-```js
+```js title="src/server/auth/signup.js"
 export const signUp = async (args, context) => {
   // Your custom code before sign-up.
   // ...

web/sidebars.js

@@ -50,11 +50,8 @@ module.exports = {
           type: "category",
           label: "Auth Providers",
           collapsed: false,
-          items: [
-            "integrations/github",
-            "integrations/google",
-            "guides/email-auth",
-          ],
+          items: ["integrations/github", "integrations/google",
+            "guides/email-auth", "guides/username-password"],
         },
         "integrations/css-frameworks",
         "deploying",