Accel Web

This is a library for integrating Astro and Accel Record.

Pagination

paginate is a function that generates pagination components. It takes a query and options as arguments.

---
import { paginate } from "accel-web";
import { Account } from "src/models";

const url = new URL(Astro.request.url);
const page = Number(url.searchParams.get("p")) || 1;

const { Nav, PageEntriesInfo } = paginate(Account.order("id", "desc"), { page, per: 10, window: 1 });
---

<!-- nav -->
<Nav />

<!-- info -->
<PageEntriesInfo />

The above code will render a result like:

<!-- nav -->
<nav>
  <ul class="pagination">
    <li class="page-item first">
      <a href="/?p=1" class="page-link">« First</a>
    </li>
    <li class="page-item prev">
      <a rel="prev" href="/?p=2" class="page-link">‹ Prev</a>
    </li>
    <li class="page-item disabled gap">
      <span class="page-link">…</span>
    </li>
    <li class="page-item page">
      <a href="/?p=2" class="page-link"> 2 </a>
    </li>
    <li class="page-item page active">
      <span class="page-link">3</span>
    </li>
    <li class="page-item page">
      <a href="/?p=4" class="page-link"> 4 </a>
    </li>
    <li class="page-item disabled gap">
      <span class="page-link">…</span>
    </li>
    <li class="page-item next">
      <a rel="next" href="/?p=4" class="page-link">Next ›</a>
    </li>
    <li class="page-item last">
      <a href="/?p=6" class="page-link">Last »</a>
    </li>
  </ul>
</nav>

<!-- info -->
<div class="page-entries-info">Displaying <b>21 - 30</b> of <b>55</b> in total</div>

The following styles will be applied when Bootstrap 5 is used. You can override the styles by adding your own CSS.

Form and Request Parameters

formFor is a function that generates form components. It takes a record as an argument. RequestParameters is a class that parses the request parameters.

These tools make it easy to create forms and retrieve request parameters. Below is an example of a sign-up form.

---
// src/pages/signup.astro
import { formFor, RequestParameters } from "accel-web";
import Layout from "../layouts/Layout.astro";
import { Account } from "../models";
import { z } from "astro/zod";

const account = Account.build({});

if (Astro.request.method === "POST") {
  const params = await RequestParameters.from(Astro.request, Astro.params);
  // Using zod, you can validate request parameters and extract them with type information
  const accountParams = params.require("account").parseWith(
    z.object({
      email: z.string(),
      password: z.string(),
      passwordConfirmation: z.string(),
    })
  );
  // If strict type information is not required, you can write it as follows
  // const accountParams = params.require("account").permit("email", "password", "passwordConfirmation");
  if (account.update(accountParams)) {
    return Astro.redirect("/");
  }
}

// `formFor` is a helper function that creates a form object for the model
const { Form, Submit, Label, TextField, PasswordField } = formFor(account);
---

<Layout title="Sign Up">
  <main class="container" style="max-width: 700px; min-width: 400px;">
    <h1>Sign Up</h1>
    <Form method="post" class="form">
      {
        account.errors.fullMessages.length > 0 && (
          <div class="alert alert-danger">
            {account.errors.fullMessages.map((message) => (
              <div>{message}</div>
            ))}
          </div>
        )
      }
      <div class="mb-3">
        <!--
          The value of Label will be set according to the i18n settings configured in i18next.
          `accelrecord.attributes.Account.email` is the key to be translated.
        -->
        <Label for="email" />
        <!-- The value of TextField will be pre-filled with the value of account.email -->
        <TextField attr="email" class="form-control" />
      </div>
      <div class="mb-3">
        <Label for="password" />
        <PasswordField attr="password" class="form-control" />
      </div>
      <div class="mb-3">
        <Label for="passwordConfirmation" />
        <PasswordField attr="passwordConfirmation" class="form-control" />
      </div>
      <div class="d-flex justify-content-between">
        <Submit class="btn btn-secondary">Sign Up</Submit>
        <a href="/" class="btn btn-link">Back</a>
      </div>
    </Form>
  </main>
</Layout>

SearchFormFor

searchFormFor is a function that generates a search form component.

The following is an example of a search form using searchFormFor. You can implement a search form and pagination by combining it with the previously introduced paginate.

---
// src/pages/todos/index.astro
import { paginate, RequestParameters, searchFormFor } from "accel-web";
import { Todo } from "src/models";
import Layout from "../../layouts/Layout.astro";

const params = await RequestParameters.from(Astro.request);
const page = Number(params.p) || 1;

// Model.search() returns a search object.
// params.q is a search query object from query parameters.
// Example:
//  Path like "/todos?q.id_eq=1&q.title_cont=foo" is parsed as follows:
//  { q: { id_eq: 1, title_cont: "foo" } }
const search = Todo.search(params.q);
// searchFormFor() returns form fields for search.
const { NumberField, TextField } = searchFormFor(search);

const { Nav, PageEntriesInfo, records } = paginate(search.result().order("id", "desc"), { page });
---

<Layout title="TODOs">
  <main class="container" style="max-width: 700px; min-width: 550px;">
    <h1 class="text-center">All TODOs</h1>
    <div class="d-flex justify-content-end">
      <a href="/todos/new" class="btn btn-link">Add a new todo</a>
    </div>
    <form method="get" class="row">
      <div class="col mb-3">
        <NumberField attr="id_eq" placeholder="Search by ID" class="form-control" />
      </div>
      <div class="col mb-3">
        <TextField attr="title_cont" placeholder="Search by Title" class="form-control" />
      </div>
      <div class="col-md-auto mb-3">
        <button type="submit" class="btn btn-dark">Search</button>
        <a href="/todos" class="btn btn-secondary">Clear</a>
      </div>
    </form>
    <ul>
      {
        records.map((todo) => (
          <li>
            <span>{todo.id}</span>
            <span>{todo.title}</span>
            {todo.estimate ? <span>｜{todo.estimate}</span> : null}
            {todo.dueDate ? <span>{todo.dueDate.toISOString().slice(0, 10)}迄</span> : null}
            <span>({todo.status})</span>
          </li>
        ))
      }
    </ul>
    <div class="d-flex justify-content-center">
      <Nav />
    </div>
    <div class="d-flex justify-content-center">
      <PageEntriesInfo />
    </div>
  </main>
</Layout>

SortLink

SortLink is a component that generates a link for sorting. It takes a query and options as arguments.

---
import { RequestParameters, SortLink } from "accel-web";
import { Account } from "src/models";

const params = await RequestParameters.from(Astro.request);
const search = Account.search(params.q);
---
<table>
  <thead>
    <tr>
      <th>
        <!-- Basic Usage -->
        <SortLink q={search} key="id" />
      </th>
      <th>
        <!--
          Customization Examples
          - Specifying multiple sort attributes
          - Changing the appearance of ascending/descending arrows (default is "▲" and "▼")
          - Custom text
        -->
        <SortLink q={search} key={["email", "id desc"]} asc="↓" desc="↑">
          Email Address
        </SortLink>
      </th>
    </tr>
  </thead>
  <tbody>
    {
      search.result().map((account) => (
        <tr>
          <td>{account.id}</td>
          <td>{account.email}</td>
        </tr>
      ))
    }
  </tbody>
</table>

Session

createCookieSessionStorage is a function that generates a session storage object. This is a thin wrapper around the function of the same name provided by astro-cookie-session, so please refer to its documentation for basic usage. The difference from the original is that it adds the ability to save Accel Record models as sessions.

// src/session.ts
import { createCookieSessionStorage } from "accel-web";
import type { Account } from "./models";

export type SessionData = {
  // You can store the Accel Record model in the session
  account: Account;
};

export const { getSession } = createCookieSessionStorage<SessionData>();

export type Session = ReturnType<typeof getSession>;

---
// src/pages/login.astro
import { getSession } from "../session";
import { Account } from "../models";

const session = getSession(Astro.cookies);
// Read an Account model from the session
if (session.account) {
  return Astro.redirect("/");
}
let message = '';

if (Astro.request.method === "POST") {
  const params = await RequestParameters.from(Astro.request, Astro.params);
  // Account model is assumed to have password authentication implemented.
  // https://github.com/koyopro/accella/tree/main/packages/accel-record#password-authentication
  const account = Account.findBy({ email: params['email'] });
  if (account?.authenticate(params['password'])) {
    // Save an Account model in the session
    session.account = account;
    return Astro.redirect("/");
  } else {
    message = "Invalid email or password";
  }
}
---
<form method="post">
  {message && <div>{message}</div>}
  <div>
    <label for="email">Email</label>
    <input type="email" id="email" name="email" required />
  </div>
  <div>
    <label for="password">Password</label>
    <input type="password" id="password" name="password" required />
  </div>
  <div>
    <button type="submit">Login</button>
  </div>
</form>

CSRF Protection

We provide helper functions for CSRF protection using tokens.

Use defineAuthenticityToken and validateAuthenticityToken in Astro middleware to prepare and validate tokens for requests.

// src/middleware.ts
import { RequestParameters } from "accel-web";
import { defineAuthenticityToken, validateAuthenticityToken } from "accel-web/csrf";
import { APIContext } from "astro";
import { getSession } from "./session";

export const onRequest = async (context: APIContext, next: any) => {
  const { cookies, request, params, locals } = context;
  locals.session = getSession(cookies);
  locals.params = await RequestParameters.from(request, params);

  defineAuthenticityToken(locals, locals.session);
  validateAuthenticityToken(locals.params, locals.session, request);

  return await next();
};

When defineAuthenticityToken is executed, the token can be accessed via Astro.locals.authenticityToken. This token is automatically embedded when generating forms using formFor. If you are creating a form manually, use the CsrfTokenField component to include the token as shown below.

---
import CsrfTokenField from "accel-web/form/CsrfTokenField.astro";
---

<form method="POST">
  <CsrfTokenField />
  <!-- ... -->
</form>

validateAuthenticityToken validates the authenticity token for POST, PUT, PATCH, and DELETE requests. If the tokens do not match, an InvalidAuthenticityToken exception is thrown.

For Ajax Requests

Use the CsrfMetaTags component in your layout file to generate meta tags. Set the token from these meta tags in the X-CSRF-Token request header.

---
import { CsrfMetaTags } from "accel-web";
---

<!-- ... -->
  <head>
    <CsrfMetaTags />
    <!-- Meta tags like the following will be generated:
    <meta name="csrf-param" content="authenticity_token">
    <meta name="csrf-token" content="xxxx">
    -->
  </head>
<!-- ... -->