Plugins Development Guide

Plugins are a way to extend the functionality of the Answer project. You can create your own plugins to meet your own needs.

tip

Viewing the official plugin code will make you to quickly understand and learn plugin development.

Introduction

Plugin template types

Currently we have three types of plugins:

• Backend plugin
• Standard UI plugin
• Builtin plugin

Plugin type

We classify plugins into different types. Different types of plugins have different functions. Plugins of the same type have the same effect, but are implemented differently.

Plugin Name	Template Type	Description
Connector	Backend Plugin	The Connector plugin helps us to implement third-party login functionality
Storage	Backend Plugin	The Storage plugin helps us to upload files to third-party storage.
Cache	Backend Plugin	Support for using different caching middleware.
Search	Backend Plugin	Support for using search engines to speed up the search for question answers.
User Center	Backend Plugin	Using the third-party user system to manage users.
Notification	Backend Plugin	The Notification plugin helps us to send messages to third-party notification systems.
Route	Standard UI Plugin	Provides support for custom routing.
Editor	Standard UI Plugin	Supports extending the markdown editor's toolbar.
Captcha	Standard UI Plugin	Provides support for captcha.
Reviewer	Backend Plugin	Allows customizing the reviewer functionality.
Filter	Backend Plugin	Filter out illegal questions or answers. (coming soon)
Render	Standard UI Plugin	Parsers for different content formats. (coming soon)

Create a Plugin

info

The name field in package.json is the name of the package we add dependencies to; do not use _ to connect this field naming, please use -; for example:

"editor-chart" ✅
"editor_chart" ❌

1. Go to the ui > src > plugin directory of the project.

2. Execute the following commands in that directory:

npx create-answer-plugin <pluginName>

3. Select the type of plugin you want to create.

Run the Plugin

Run the Backend Plugin

1. First, execute make ui to compile the front-end code.

2. In the cmd > answer > main.go file, import your plugin.

   import (
     answercmd "github.com/apache/incubator-answer/cmd"
   
     // Import the plugins
     _ "github.com/apache/incubator-answer-plugins/my-plugin"
   )

3. Use go mod edit to add the plugin to the go.mod file.

   go mod edit -replace=github.com/apache/incubator-answer-plugins/my-plugin=./ui/src/plugins/my-plugin

4. Update the dependencies.

   go mod tidy

5. Start the project.

   go run cmd/answer/main.go run -C ./answer-data

Run the Standard UI Plugin

1. Go to the ui directory.

2. Install the dependencies.

   pnpm pre-install

3. Start the project.

   pnpm start

4. Refer to the Run the Backend Plugin and add the plugin to the project.

Backend Plugin Development

Implement the Base interface

The Base interface contains basic information about the plugin and is used to display.

// Info presents the plugin information
type Info struct {
    Name        Translator
    SlugName    string
    Description Translator
    Author      string
    Version     string
    Link        string
}

// Base is the base plugin
type Base interface {
    // Info returns the plugin information
    Info() Info
}

caution

The SlugName of the plugin must be unique. Two plugins with the same SlugName will panic when registering.

Implement the function interface

note

Different plugin types require different interfaces of implementation.

For example, following is the Connector plugin interface.

type Connector interface {
    Base
    
    // ConnectorLogoSVG presents the logo in svg format
    ConnectorLogoSVG() string
    
    // ConnectorName presents the name of the connector
    // e.g. Facebook, Twitter, Instagram
    ConnectorName() Translator
    
    // ConnectorSlugName presents the slug name of the connector
    // Please use lowercase and hyphen as the separator
    // e.g. facebook, twitter, instagram
    ConnectorSlugName() string
    
    // ConnectorSender presents the sender of the connector
    // It handles the start endpoint of the connector
    // receiverURL is the whole URL of the receiver
    ConnectorSender(ctx *GinContext, receiverURL string) (redirectURL string)
    
    // ConnectorReceiver presents the receiver of the connector
    // It handles the callback endpoint of the connector, and returns the
    ConnectorReceiver(ctx *GinContext, receiverURL string) (userInfo ExternalLoginUserInfo, err error)
}

tip

Translator is a struct for translation. Please refer to the documentation for details.

Implement the configuration interface

For details on the description of each configuration item, please refer to the documentation.

type Config interface {
    Base

    // ConfigFields returns the list of config fields
    ConfigFields() []ConfigField

    // ConfigReceiver receives the config data, it calls when the config is saved or initialized.
    // We recommend to unmarshal the data to a struct, and then use the struct to do something.
    // The config is encoded in JSON format.
    // It depends on the definition of ConfigFields.
    ConfigReceiver(config []byte) error
}

Register initialization function

import "github.com/apache/incubator-answer/plugin"

func init() {
    plugin.Register(&GitHubConnector{
        Config: &GitHubConnectorConfig{},
    })
}

Standard UI plugin Development

The default configuration is as follows:

slug_name: <slug_name> 
type: <type>
version: 0.0.1
author: 

import i18nConfig from './i18n';
import Component from './Component';
import info from './info.yaml';

export default {
  info: {
    slug_name: info.slug_name,
    type: info.type, 
  },
  i18nConfig,
  component: Component, 
};

Among them, type、slug_name and component are required fields. i18nConfig and hooks are optional fields.

Currently the front end supports the following types of plugins:

• editor
• route
• captcha

Editor plugin

Refer to editor-chart for details.

Route plugin

The plugin configuration of the routing type adds the route field to the configuration file.

slug_name: <slug_name>
route: /<route>
type: route
version: 0.0.1
author: 

import i18nConfig from './i18n';
import Component from './Component';
import info from './info.yaml';

export default {
  info: {
    slug_name: info.slug_name,
    type: info.type,
    route: info.route,
  },
  i18nConfig,
  component: Component,
};

Captcha plugin

Refer to captcha-basic for details.

Builtin plugin Development

It is not so different from React component, this plugin is more suitable for the following scenarios:

1. There are complex business logics that cannot be separated from the code (such as Oauth).
2. Some back-end plugins require UI support for business purposes (such as Search).
3. This plugin has extremely low requirements for developers and requires no additional configuration work.

How to develop builtin plugin

1. Get familiar with the directory structure. Go to the ui/src/plugins/builtin directory and create a directory, such as Demo. Then refer to the existing plugins to create the necessary files to start development.

// ui/src/plugins/builtin
.
├── ...
├── Demo
      ├── i18n (language file)
            ├── en_US.yaml (default language required)
            ├── index.ts (required)
            ├── zh_CN.ts (any language you want to provide)
      ├── index.tsx (component required)
      ├── info.yaml (plugin information required)
      ├── services.ts (api)

2. Export the plugins you have just defined in the plugins list file plugins/builtin/index.ts

import Demo from './Demo'

export default {
  ...(exists plugins),
  Demo,
};

3. Now you can use the PluginRender component to render the just-defined plugin where you want it!

  <PluginRender
    type="connector"
    slug_name="third_party_connector"
  />

4. Publish plugin: initiate the PR process normally and describe the plugin function and scope of influence in detail.