nextcloud app文件夹目录结构

+---appinfo
+---css
+---js
+---l10n
+---lib
|   +---AppInfo (必须)
|   +---Command
|   +---Controller  (必须)
|   +---Cron
|   +---Db
|   +---Exceptions
|   +---Listeners
|   +---Migration
|   +---Model
|   +---Plugins
|   +---Service
|   +---Storage
|   \---Tools
|       +---Db
|       +---Exceptions
|       +---Traits
+---screenshots
+---vendor

目录结构解析

* appinfo
    * info.xml 信息说明文件
        ```
        <?xml version="1.0"?>
        <info xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:noNamespaceSchemaLocation="https://apps.nextcloud.com/schema/apps/info.xsd">
            <id>ai_test</id> // id
            <name>AI测试</name> // 名称
            <summary>对接AI测试</summary> // 摘要
            <description>对接AI测试</description> //  描述
            <version>1.0</version> //  版本
            <licence>agpl</licence> //  开源许可
            <author>Eason</author> // 作者
            <namespace>AiTest</namespace> //  代码命名空间
            <types> //  类型
                <filesystem/>
            </types>
            <documentation> //  文档地址
                <admin>https://github.com/nextcloud/files_lock/blob/master/README.md</admin>
            </documentation>
            <category>tools</category> //  分类
            <category>files</category> //  分类
            <website>https://github.com/nextcloud/files_lock</website> // web站点
            <bugs>https://github.com/nextcloud/files_lock/issues</bugs> // bug提交地址
            <repository>https://github.com/nextcloud/files_lock.git</repository> //  代码仓库
            <screenshot>https://raw.githubusercontent.com/nextcloud/files_lock/master/screenshots/0.7.0.png</screenshot> //  预览图
            <dependencies> 
                <nextcloud min-version="21" max-version="23"/> //  兼容nc的版本
            </dependencies>
        </info>
        ```
    * routes.php 路由文件
        ```
　　　　　declare(strict_types=1);
        return [
            'routes' => [
                ['name' => 'AiTest#doRun', 'url' => '/{ownerId}/{fileId}', 'verb' => 'PUT'],
            ]
        ];
        ```
* css 样式文件
* js javascript脚本
    * main.js
        ```
        /** AI测试 **/
        (function() {
        
            _.extend(OC.Files.Client, {
                PROPERTY_AI_TEST: '{' + OC.Files.Client.NS_NEXTCLOUD + '}test',
            });
        
            var AIPlugin = {
                /** 文件列表渲染时 **/
                attach: function(fileList) {
                    var self = this;
        
                    /** 增加 webdav属性 **/
                    var oldGetWebdavProperties = fileList._getWebdavProperties;
                    fileList._getWebdavProperties = function() {
                        var props = oldGetWebdavProperties.apply(this, arguments);
                        props.push(OC.Files.Client.PROPERTY_AI_TEST);
                        return props
                    };
                    /** 注册右边三个点中的菜单选择 **/
                    fileList.fileActions.registerAction({
                        name: 'test',
                        displayName: function(context) {
                            if (context && context.$file) {
                                return "AI测试"
                            }
                            return '';
                        },
                        mime: 'all',
                        order: -999,
                        iconClass: 'icon-details',
                        permissions: OC.PERMISSION_UPDATE,
                        actionHandler: function (filename,context) {
                            var fileId         = context.$file.data("id");
                            var fileOwnerId    = typeof context.$file.data("shareOwnerId") == 'undefined' ?
                                OC.getCurrentUser().uid :
                                context.$file.data("shareOwnerId");
        
                            $.ajax({
                                method: 'PUT',
                                url: OC.generateUrl('/apps/ai_test/' + fileOwnerId + '/' + fileId)
                            }).done(function(res) {
                                console.log(res);
                            }).fail(function(res) {
                                OCP.Toast.warning(res.responseJSON.message)
                            });
                        }
                    })
                },
            };
            /** 向全局的插件对象注册该插件 **/
            OC.Plugins.register('OCA.Files.FileList', AIPlugin)
        
        })();
        ```
* l10n 语言文件
* lib
    * AppInfo
        * Application.php
            ```
　　　　　　  declare(strict_types=1);
            
            namespace OCA\AiTest\AppInfo;
            
            use OCA\DAV\Connector\Sabre\Node as SabreNode;
            use OCA\Files\Event\LoadAdditionalScriptsEvent;
            use OCA\AiTest\Listeners\LoadAdditionalScripts;
            use OCP\AppFramework\App;
            use OCP\AppFramework\Bootstrap\IBootContext;
            use OCP\AppFramework\Bootstrap\IBootstrap;
            use OCP\AppFramework\Bootstrap\IRegistrationContext;
            use OCP\IServerContainer;
            use OCP\SabrePluginEvent;
            use Sabre\DAV\INode;
            use Sabre\DAV\PropFind;
            use Throwable;
            use Closure
            class Application extends App implements IBootstrap {
                const APP_ID    = 'ai_test';
                //向文件 webdav中添加属性的固定格式：{http://nextcloud.org/ns} = nc 在系统中定义好了的
                const AI_TEST   = '{http://nextcloud.org/ns}test';
                
                /**
                 * @param array $params
                 */
                public function __construct(array $params = array()) {
                    parent::__construct(self::APP_ID, $params);
                }
                
                /**
                 * @param IRegistrationContext $context
                 * 注册事件监听
                 * event  OCA\Files\Event\LoadAdditionalScriptsEvent::class 访问 /apps/files*路由 会触发
                 * handle 事件处理 在此处 将app的css、js等静态文件加载进去
                 */
                public function register(IRegistrationContext $context): void {
                    $context->registerEventListener(
                        LoadAdditionalScriptsEvent::class,
                        LoadAdditionalScripts::class
                    );
                }
                
                /**
                 * @param IBootContext $context
                 * 在服务启动后，会触发方法
                 * @throws Throwable
                 */
                public function boot(IBootContext $context): void {
                    $context->injectFn(Closure::fromCallable([$this, 'registerHooks']));
                }
                
                /**
                 * @param IServerContainer $container 服务器容器，可以通过类获取相应的对象
                 */
                public function registerHooks(IServerContainer $container) {
                    $eventDispatcher = \OC::$server->getEventDispatcher();
                    $eventDispatcher->addListener(
                        'OCA\DAV\Connector\Sabre::addPlugin', function (SabrePluginEvent $e) {
                            $server = $e->getServer();
            
                            //注册文件的webdav属性
                            $server->on('propFind', function(PropFind $propFind, INode $node){
                                if (!$node instanceof SabreNode) {
                                    return;
                                }
                                $nodeId = $node->getId();
                                //注册webdav属性的处理方法
                                $propFind->handle(
                                    Application::AI_TEST, function () use ($nodeId) {
                                        return $nodeId;
                                    }
                                );
                            });
                        }
                    );
                }
                
            }
            ```
    * Command cli命令
    * Controller 控制器
    * Cron  后台任务
    * Db 
    * Exceptions 异常处理
    * Listeners 事件处理
    * Migration 数据迁移
    * Model
    * Plugins 
    * Service
    * Storage
    * Tools
* screenshots 预览图
* vendor 第三方库

未完待续...