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472 lines
12 KiB
Markdown
472 lines
12 KiB
Markdown
# Helpers
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Strapi provides helpers so you don't have to develop again and again the same generic functions.
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## Auth
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`auth.js` lets you get, set and delete data in either the browser's `localStorage` or `sessionStorage`.
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### Methods
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| Name | Description |
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| ---- | ----------- |
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| clear(key) | Remove the data in either `localStorage` or `sessionStorage` |
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| clearAppStorage() | Remove all data from both storage |
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| clearToken() | Remove the user's `jwt Token` in the appropriate browser's storage |
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| clearUserInfo() | Remove the user's info from storage |
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| get(key) | Get the item in the browser's storage |
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| getToken() | Get the user's `jwtToken` |
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| getUserInfo() | Get the user's infos |
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| set(value, key, isLocalStorage) | Set an item in the `sessionStorage`. If `true` is passed as the 3rd parameter it sets the value in the `localStorage` |
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| setToken(value, isLocalStorage) | Set the user's `jwtToken` in the `sessionStorage`. If `true` is passed as the 2nd parameter it sets the value in the `localStorage` |
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| setUserInfo(value, isLocalStorage) | Set the user's info in the `sessionStorage`. If `true` is passed as the 2nd parameter it sets the value in the `localStorage` |
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```js
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import auth from 'utils/auth';
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// ...
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//
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auth.setToken('12345', true); // This will set 1234 in the browser's localStorage associated with the key: jwtToken
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```
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## Colors
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This function allows to darken a color.
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### Usage
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```js
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import { darken } from 'utils/colors';
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const linkColor = darken('#f5f5f5', 1.5); // Will darken #F5F5F5 by 1.5% which gives #f2f2f2.
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```
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## Get URL Query Parameters
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The helpers allows to retrieve the query parameters in the URL.
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### Example
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```js
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import getQueryParameters from 'utils/getQueryParameters';
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const URL = '/create?source=users-permissions';
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const source = getQueryParameters(URL, 'source');
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console.log(source); // users-permissions
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```
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## Request helper
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A request helper is available to handle all requests inside a plugin.
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It takes three arguments:
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- `requestUrl`: The url we want to fetch.
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- `options`: Please refer to this [documentation](https://github.com/github/fetch).
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- `true`: This third argument is optional. If true is passed the response will be sent only if the server has restarted check out the [example](#example-with-server-autoreload-watcher).
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### Usage
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**Path -** `/plugins/my-plugin/admin/src/containers/**/sagas.js`.
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```js
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import { call, fork, put, takeLatest } from 'redux-saga/effects';
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// Our request helper
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import request from 'utils/request';
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import { dataFetchSucceeded, dataFetchError } from './actions';
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import { DATA_FETCH } from './constants';
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export function* fetchData(action) {
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try {
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const opts = {
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method: 'GET',
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};
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const requestUrl = `/my-plugin/${action.endPoint}`;
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const data = yield call(request, requestUrl, opts);
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yield put(dataFetchSucceeded(data));
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} catch(error) {
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yield put(dataFetchError(error))
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}
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}
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// Individual exports for testing
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function* defaultSaga() {
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yield fork(takeLatest, DATA_FETCH, fetchData);
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}
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export default defaultSaga;
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```
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### Simple example
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Let's say that we have a container that fetches Content Type configurations depending on URL change.
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#### Routing declaration:
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Here we want to create a route `/content-type/:contentTypeName` for the `ContentTypePage` container.
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**Path —** `./plugins/my-plugin/admin/src/container/App/index.js`.
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```js
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import React from 'react';
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import { connect } from 'react-redux';
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import { bindActionCreators, compose } from 'redux';
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import { createStructuredSelector } from 'reselect';
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import { Switch, Route, withRouter } from 'react-router-dom';
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import PropTypes from 'prop-types';
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import { pluginId } from 'app';
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import ContentTypePage from 'containers/ContentTypePage';
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import styles from './styles.scss';
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class App extends React.Component {
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render() {
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return (
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<div className={`${pluginId} ${styles.app}`}>
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<Switch>
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<Route exact path="/plugins/my-plugin/content-type/:contentTypeName" component={ContentTypePage} />
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</Switch>
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</div>
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);
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}
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}
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App.contextTypes = {
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router: PropTypes.object.isRequired,
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};
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export function mapDispatchToProps(dispatch) {
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return bindActionCreators(
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{},
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dispatch
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);
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}
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const mapStateToProps = createStructuredSelector({});
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const withConnect = connect(mapStateToProps, mapDispatchToProps);
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export default compose(
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withConnect,
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)(App);
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```
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***
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#### Constants declaration:
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Let's declare the needed constants to handle fetching data:
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**Path —** `./plugins/my-plugin/admin/src/containers/ContentTypePage/constants.js`.
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```js
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export const DATA_FETCH = 'myPlugin/ContentTypePage/DATA_FETCH';
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export const DATA_FETCH_ERROR = 'myPlugin/ContentTypePage/DATA_FETCH_ERROR';
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export const DATA_FETCH_SUCCEEDED = 'myPlugin/ContentTypePage/DATA_FETCH_SUCCEEDED';
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```
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***
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#### Actions declaration:
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Let's declare our actions.
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**Path —** `./plugins/my-plugin/admin/src/containers/ContentTypePage/actions.js`.
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```js
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import {
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DATA_FETCH,
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DATA_FETCH_ERROR,
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DATA_FETCH_SUCCEEDED,
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} from './constants';
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export function dataFetch(contentTypeName) {
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return {
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type: DATA_FETCH,
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contentTypeName,
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};
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}
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export function dataFetchError(errorMessage) {
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return {
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type: DATA_FETCH_ERROR,
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errorMessage,
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};
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}
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export function dataFetchSucceeded(data) {
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// data will look like { data: { name: 'User', description: 'Some description' } }
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return {
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type: DATA_FETCH_SUCCEEDED,
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data,
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};
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}
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```
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***
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#### Reducer setup:
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Please refer to the [Immutable documentation](https://facebook.github.io/immutable-js/docs/#/) for informations about data structure.
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**Path —** `./plugins/my-plugin/admin/src/containers/ContentTypePage/reducer.js`.
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```js
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import { fromJS, Map } from 'immutable';
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import {
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DATA_FETCH,
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DATA_FETCH_ERROR,
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DATA_FETCH_SUCCEEDED
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} from './constants';
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const initialState = fromJS({
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contentTypeName,
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error: false,
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errorMessage: '',
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data: Map({}),
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});
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function contentTypePageReducer(state = initialState, action) {
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switch (action.type) {
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case DATA_FETCH:
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return state.set('contentTypeName', action.contentTypeName);
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case DATA_FETCH_ERROR:
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return state
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.set('error', true)
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.set('errorMessage', action.errorMessage);
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case DATA_FETCH_SUCCEEDED:
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return state
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.set('error', false)
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.set('data', Map(action.data.data));
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default:
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return state;
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}
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}
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export default contentTypePageReducer;
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```
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***
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#### Selectors setup:
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**Path —** `./plugins/my-plugin/admin/src/containers/ContentTypePage/selectors.js`.
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```js
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import { createSelector } from 'reselect';
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/**
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* Direct selector to the contentTypePage state domain
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*/
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const selectContentTypePageDomain = () => state => state.get('contentTypePage');
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/**
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* Other specific selectors
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*/
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/**
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* Default selector used by ContentTypePage
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*/
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const selectContentTypePage = () => createSelector(
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selectContentTypePageDomain(),
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(substate) => substate.toJS()
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);
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const makeSelectContentTypeName = () => createSelector(
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selectContentTypePageDomain(),
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(substate) => substate.get('contentTypeName');
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)
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export default selectContentTypePage;
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export { makeSelectContentTypeName, selectContentTypePageDomain };
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```
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***
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#### Handling route change:
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**Path —** `./plugins/my-plugin/admin/src/containers/ContentTypePage/index.js`.
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```js
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import React from 'react';
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import { connect } from 'react-redux';
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import { createStructuredSelector } from 'reselect';
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import { bindActionCreators, compose } from 'redux';
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import { NavLink } from 'react-router-dom';
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import PropTypes from 'prop-types';
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import { map } from 'lodash';
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// Utils to create the container's store
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import injectSaga from 'utils/injectSaga';
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import injectReducer from 'utils/injectReducer';
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import { dataFetch } from './actions';
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import { selectContentTypePage } from './selectors';
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import saga from './sagas';
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import reducer from './reducer';
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import styles from './styles.scss';
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export class ContentTypePage extends React.Component { // eslint-disable-line react/prefer-stateless-function
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constructor(props) {
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super(props);
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this.links = [
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{
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to: 'plugin/my-plugin/content-type/product',
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info: 'Product',
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},
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{
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to: 'plugin/my-plugin/content-type/user',
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info: 'User',
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},
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];
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}
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componentDidMount() {
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this.props.dataFetch(this.props.match.params.contentTypeName);
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}
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componentWillReceiveProps(nextProps) {
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if (nextProps.match.params.contentTypeName !== this.props.match.params.contentTypeName) {
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this.props.dataFetch(nextProps.match.params.contentTypeName);
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}
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}
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render() {
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return (
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<div className={styles.contentTypePage}>
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<div>
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<ul>
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{map(this.links, (link, key) => (
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<li key={key}>
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<NavLink to={link.to}>{link.info}</NavLink>
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</li>
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))}
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</ul>
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</div>
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<div>
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<h1>{this.props.data.name}</h1>
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<p>{this.props.data.description}</p>
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</div>
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</div>
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);
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}
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}
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const mapStateToProps = selectContentTypePage();
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function mapDispatchToProps(dispatch) {
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return bindActionCreators(
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{
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dataFetch,
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},
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dispatch,
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);
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}
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ContentTypePage.propTypes = {
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data: PropTypes.object.isRequired,
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dataFetch: PropTypes.func.isRequired,
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match: PropTypes.object.isRequired,
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};
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const withConnect = connect(mapStateToProps, mapDispatchToProps);
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const withSaga = injectSaga({ key: 'contentTypePage', saga });
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const withReducer = injectReducer({ key: 'contentTypePage', reducer });
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export default compose(
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withReducer,
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withSaga,
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withConnect,
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)(ContentTypePage);
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```
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***
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#### Fetching data:
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The `sagas.js` file is in charge of fetching data.
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**Path —** `./plugins/my-plugin/admin/src/containers/ContentTypePage/sagas.js`.
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```js
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import { LOCATION_CHANGE } from 'react-router-redux';
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import { takeLatest, call, take, put, fork, cancel, select } from 'redux-saga/effects';
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import request from 'utils/request';
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import {
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dataFetchError,
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dataFetchSucceeded,
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} from './actions';
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import { DATA_FETCH } from './constants';
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import { makeSelectContentTypeName } from './selectors';
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export function* fetchData() {
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try {
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const opts = { method: 'GET' };
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// To make a POST request { method: 'POST', body: {Object} }
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const endPoint = yield select(makeSelectContentTypeName());
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const requestUrl = `my-plugin/**/${endPoint}`;
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// Fetching data with our request helper
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const data = yield call(request, requestUrl, opts);
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yield put(dataFetchSucceeded(data));
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} catch(error) {
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yield put(dataFetchError(error.message));
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}
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}
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function* defaultSaga() {
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const loadDataWatcher = yield fork(takeLatest, DATA_FETCH, fetchData);
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yield take(LOCATION_CHANGE);
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yield cancel(loadDataWatcher);
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}
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export default defaultSaga;
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```
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***
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### Example with server autoReload watcher
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Let's say that you want to develop a plugin that needs server restart on file change (like the settings-manager plugin) and you want to be aware of that to display some stuff..., you just have to send a third argument: `true` to our request helper and it will ping a dedicated route and send the response when the server has restarted.
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**Path —** `./plugins/my-plugin/admin/src/containers/**/sagas.js`.
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```js
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import { takeLatest, call, take, put, fork, cancel, select } from 'redux-saga/effects';
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import request from 'utils/request';
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import {
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submitSucceeded,
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submitError,
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} from './actions';
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import { SUBMIT } from './constants';
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// Other useful imports like selectors...
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// ...
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export function* postData() {
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try {
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const body = { data: 'someData' };
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const opts = { method: 'POST', body };
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const requestUrl = `**yourUrl**`;
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const response = yield call(request, requestUrl, opts, true);
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if (response.ok) {
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yield put(submitSucceeded());
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} else {
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yield put(submitError('An error occurred'));
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}
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} catch(error) {
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yield put(submitError(error.message));
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}
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}
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function* defaultSaga() {
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yield fork(takeLatest, SUBMIT, postData);
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// ...
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}
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export default defaultSaga;
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```
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