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Table of Contents

 

In this tutorial, we will follow the guideline for developing a plugin to develop our Slack Notification plugin. Please also refer to the very first tutorial 如何开发一个Bean Shell Hash Variable插件 for more details steps.

1. What is the problem?

We want to send message to Slack to notify user when there is an assignment created for them in Joget Workflow.

2. How to solve the problem?

We will develop an 审计追踪插件 to send message to Slack

3. What is the input needed for your plugin?

To develop a Slack Notification plugin, we will consider providing the properties options similar to User Notification plugin.

4. What is the output and expected outcome of your plugin?

When an assignment is created for an user, a message with assignment link will send to his/her Slack account based on the configuration.

5. Are there any resources/API that can be reused?

We can use slack-webhook library to integrate with Slack. We can also extend the 在本教程中,我们将遵循开发插件  来开发我们的Slack Notification插件的  指导原则。 有关更多详细信息步骤,请参阅第一个教程  如何开发一个Bean Shell哈希变量插件

1.什么问题?

我们希望发送消息给  Slack  ,以便在Joget Workflow中为他们创建任务时通知用户。

2.如何解决问题?

我们将开发一个  审计追踪插件  发送消息给  Slack。 

3.你的插件需要什么输入?

为了开发一个Slack Notification插件,我们将考虑提供类似于User Notification插件的属性选项  。

4.你的插件的输出和预期结果是什么?

当为用户创建分配时,具有分配链接的消息将根据配置发送到他/她的Slack帐户。

5.是否有任何资源/ API可以重复使用?

我们可以使用  slack-webhook  库来与Slack集成。我们还可以扩展  org.joget.apps.app.lib.UserNotificationAuditTrail to save our time on re-implement similar methods.来节省我们重新实现类似方法的时间。

6.

...

We need to always have our Joget Workflow Source Code ready and builded by following this guideline

The following tutorial is prepared with a Macbook Pro and the Joget Source Code is version 5.0.1. Please refer to the 如何开发插件 article for other platform commands.

...

准备你的开发环境

我们需要始终准备好我们的Joget工作流程源代码,并按照  这个指导方针建立。 

下面的教程是用Macbook Pro编写的,Joget源代码是5.0.1版本。 其他平台命令请参阅  如何开发插件文章。

假设我们的文件夹目录如下所示。 

Code Block
- Home
  - joget
    - plugins
    - jw-community
      -5.0.1

The "plugins" directory is the folder we will create and store all our plugins and the "jw-community" directory is where the Joget Workflow Source code is stored.

Run the following command to create a maven project in "plugins" directory.“插件”目录是我们将创建和存储我们所有插件的文件夹,“jw-community”目录是Joget Workflow源代码的存储位置。

运行以下命令在“plugins”目录下创建一个maven项目。

Code Block
languagebash
cd joget/plugins/
~/joget/jw-community/5.0.1/wflow-plugin-archetype/create-plugin.sh org.joget slack_notification 5.0.1

Then, the shell script will ask us to key in a version number for the plugin and ask us for a confirmation before it generates the maven project.然后,shell脚本会要求我们输入插件的版本号,并在生成maven项目之前要求我们确认。

Code Block
languagebash
Define value for property 'version':  1.0-SNAPSHOT: : 5.0.0
[INFO] Using property: package = org.joget
Confirm properties configuration:
groupId: org.joget
artifactId: slack_notification
version: 5.0.0
package: org.joget
Y: : y

We should get a "BUILD SUCCESS" message shown in our terminal and a "slack_notification" folder created in the "plugins" folder.

Open the maven project with your favourite IDE. I will be using NetBeans.  

7. Just code it!

a. Extending the abstract class of a plugin type

Create a "SlackNotification" class under "org.joget" package. Then, extend the class with 我们应该在终端上显示“BUILD SUCCESS”消息,在“plugins”文件夹中创建一个“slack_notification”文件夹。

用你最喜欢的IDE打开maven项目。我将使用  NetBeans。  

7. 开始编码吧!

a. 扩展插件类型的抽象类

在“org.joget”包下创建一个“SlackNotification”类。然后,使用  org.joget.apps.app.lib.UserNotificationAuditTrail class which is extends   类扩展org.joget.plugin.base.DefaultAuditTrailPlugin abstract class. Please refer to 审计追踪插件. We will need to implement   抽象类。请参考  审计追踪插件。我们还需要实现  org.joget.plugin.base.PluginWebSupport interface class as well to provide a send test message button in plugin properties page. Please refer to   接口类,并在插件属性页面提供一个发送测试消息按钮。请参考  Web Service 插件.

b.

...

实现所有的抽象方法

像往常一样,我们必须执行所有的抽象方法。我们将使用AppPluginUtil.getMessage方法来支持i18n,并使用常量变量MESSAGE_PATH作为消息资源包目录。

Code Block
languagejava
titleImplementation of all basic abstract methods
collapsetrue
package org.joget;
 
import org.joget.apps.app.lib.UserNotificationAuditTrail;
import org.joget.apps.app.service.AppPluginUtil;
import org.joget.apps.app.service.AppUtil;
 
public class SlackNotification extends UserNotificationAuditTrail {
    private final static String MESSAGE_PATH = "message/SlackNotification";
    
    @Override
    public String getName() {
        return "Slack Notification";
    }
    @Override
    public String getVersion() {
        return "5.0.0";
    }
    
    @Override
    public String getClassName() {
        return getClass().getName();
    }
    
    @Override
    public String getLabel() {
        //support i18n
        return AppPluginUtil.getMessage("org.joget.SlackNotification.pluginLabel", getClassName(), MESSAGE_PATH);
    }
    @Override
    public String getDescription() {
        //support i18n
        return AppPluginUtil.getMessage("org.joget.SlackNotification.pluginDesc", getClassName(), MESSAGE_PATH);
    }
    
    @Override
    public String getPropertyOptions() {
        return AppUtil.readPluginResource(getClass().getName(), "/properties/slackNotification.json", null, true, MESSAGE_PATH);
    }
}

Now, we have to create a UI for admin user to provide inputs for our plugin. In getPropertyOptions method, we already specify our 插件属性选项与配置 definition file is located at "现在,我们必须为管理员用户创建一个UI,为我们的插件提供输入。在getPropertyOptions方法中,我们已经指定了我们的  插件属性选项和配置  定义文件位于“/properties/slackNotification.json". Let us create a directory "resources/properties" under "slackjson”。让我们在“slack_notification / src / main" directory. After creating the directory, create a file named "slackNotification.json" in the "properties" folder.In the properties definition options file, we will need to provide options as below. Please note that we can use "@@message.key@@" syntax to support i18n in our properties options. Here, we can actually copy the properties options of User Notification plugin and modify from there. Please refer to userNotificationAuditTrail.json.main”目录下创建一个目录“resources / properties”。创建目录后,在“properties”文件夹中创建一个名为“slackNotification.json”的文件。

在属性定义选项文件中,我们需要提供如下的选项。请注意,我们可以在我们的属性选项中使用“@@ message.key @@”语法来支持i18n。在这里,我们实际上可以复制用户通知插件的属性选项,并从那里修改。请参阅  userNotificationAuditTrail.json

Code Block
languagejs
[{
    title : '@@SlackNotification.config@@',
    properties : [
    {
        name : 'apiurl',
        label : '@@SlackNotification.url@@',
        type : 'textfield',
        required : 'true'
    },
    {
        label : '@@SlackNotification.from@@',
        type : 'header'
    },
    {
        name : 'username',
        label : '@@SlackNotification.fromUsername@@',
        type : 'textfield',
        value : '@@SlackNotification.fromUsername.value@@'
    },
    {
        name : 'customIcon',
        label : '@@SlackNotification.customIcon@@',
        type : 'selectbox',
        value : 'joget',
        options : [{
            value : '',
            label : '@@SlackNotification.customIcon.none@@'
        },
        {
            value : 'joget',
            label : '@@SlackNotification.customIcon.joget@@'
        },
        {
            value : 'url',
            label : '@@SlackNotification.customIcon.url@@'
        },
        {
            value : 'emoji',
            label : '@@SlackNotification.customIcon.emoji@@'
        }]
    },
    {
        name : 'iconUrl',
        label : '@@SlackNotification.customIcon.url@@',
        type : 'textfield',
        required : 'true',
        control_field: 'customIcon',
        control_value: 'url',
        control_use_regex: 'false'
    },
    {
        name : 'iconEmoji',
        label : '@@SlackNotification.customIcon.emoji@@',
        type : 'textfield',
        required : 'true',
        control_field: 'customIcon',
        control_value: 'emoji',
        control_use_regex: 'false'
    },
    {
        label : '@@SlackNotification.to@@',
        type : 'header'
    },
    {
        name : 'usernameTransform',
        label : '@@SlackNotification.usernameTransform@@',
        description : '@@SlackNotification.usernameTransform.desc@@',
        type : 'textfield',
        value : '@@SlackNotification.usernameTransform.value@@',
        required : 'True'
    },
    {
        label : '@@SlackNotification.message@@',
        type : 'header'
    },
    {
        name : 'text',
        label : '@@SlackNotification.text@@',
        description : '@@SlackNotification.text.desc@@',
        type : 'codeeditor',
        required : 'True'
    },
    {
        name : 'unfurl_links',
        label : '@@SlackNotification.unfurl_links@@',
        description : '@@SlackNotification.unfurl_links.desc@@',
        type : 'checkbox',
        value : 'true',
        options : [{
            value : 'true',
            label : ''
        }]
    },
    {
        name : 'unfurl_media',
        label : '@@SlackNotification.unfurl_media@@',
        description : '@@SlackNotification.unfurl_media.desc@@',
        type : 'checkbox',
        value : 'true',
        options : [{
            value : 'true',
            label : ''
        }]
    }],
    buttons : [{
        name : 'sendTestMessage',    
        label : '@@SlackNotification.sendTestMessage@@',
        ajax_url : '[CONTEXT_PATH]/web/json/app[APP_PATH]/plugin/org.joget.SlackNotification/service?action=sendTestMessage',
        fields : ['url'],
        addition_fields : [
            {
                name : 'testChannel',
                label : '@@SlackNotification.sendTestMessage.testChannel@@',
                type : 'textfield'
            }
        ]
    }]
},
{
    title : '@@app.usernotificationaudittrail.notificationLink@@',
    properties : [
    {
        name : 'base',
        label : '@@app.usernotificationaudittrail.baseUrl@@',
        type : 'textfield',
        description : '@@app.usernotificationaudittrail.baseUrl.desc@@',
        required : 'True'
    },
    {
        name : 'url',
        label : '@@app.usernotificationaudittrail.url@@',
        type : 'textfield'
    },
    {
        name : 'urlName',
        label : '@@app.usernotificationaudittrail.urlName@@',
        type : 'textfield'
    },
    {
        name : 'parameterName',
        label : '@@app.usernotificationaudittrail.parameterName@@',
        description : '@@app.usernotificationaudittrail.parameterName.desc@@',
        type : 'textfield',
        value : 'activityId'
    },
    {
        name : 'passoverMethod',
        label : '@@app.usernotificationaudittrail.passoverMethod@@',
        type : 'selectbox',
        value : 'param',
        options : [{
            value : 'none',
            label : '@@app.usernotificationaudittrail.passoverMethod.none@@'
        },
        {
            value : 'append',
            label : '@@app.usernotificationaudittrail.passoverMethod.append@@'
        },
        {
            value : 'param',
            label : '@@app.usernotificationaudittrail.passoverMethod.param@@'
        }]
    }]
},
{
    title : '@@app.usernotificationaudittrail.advanced@@',
    properties : [{
        name : 'exclusion',
        label : '@@app.usernotificationaudittrail.activityExclusion@@',
        type : 'multiselect',
        size : '10',
        options_ajax : '[CONTEXT_PATH]/web/json/app[APP_PATH]/plugin/org.joget.apps.app.lib.UserNotificationAuditTrail/service?action=getActivities'
    }]
}]

After completing the properties option to collect inputs, we can work on the main methods of the plugin which is execute method. But, since we extended UserNotificationAuditTrail class, we just need to override the sendEmail method which used to send out email by UserNotificationAuditTrail class.在完成属性选项以收集输入之后,我们可以处理作为执行方法的插件的主要方法。但是,由于我们扩展了UserNotificationAuditTrail类,因此我们只需要重写用于通过UserNotificationAuditTrail类发送电子邮件的sendEmail方法。

Code Block
languagejava
    private SlackApi api = null;
 
    @Override
    protected void sendEmail (final Map props, final AuditTrail auditTrail, final WorkflowManager workflowManager, final List<String> users, final WorkflowActivity wfActivity) {
        new PluginThread(new Runnable() {
            public void run() {
                WorkflowUserManager workflowUserManager = (WorkflowUserManager) AppUtil.getApplicationContext().getBean("workflowUserManager");
                String base = (String) props.get("base");
                String url = (String) props.get("url");
                String urlName = (String) props.get("urlName");
                String parameterName = (String) props.get("parameterName");
                String passoverMethod = (String) props.get("passoverMethod");
                String text = (String) props.get("text");
                String linkLabel = AppPluginUtil.getMessage("SlackNotification.viewAssignment", getClassName(), MESSAGE_PATH);
                String activityInstanceId = wfActivity.getId();
                String link = getLink(base, url, passoverMethod, parameterName, activityInstanceId);
                if (!link.startsWith("http")) {
                    if (!link.startsWith("/")) {
                        link = "/" + link;
                    }
                    link = base + link;
                }
                
                SlackMessage message = createMessage();
                try {
                    for (String username : users) {
                        workflowUserManager.setCurrentThreadUser(username);
                        WorkflowAssignment wfAssignment = null;
                        int count = 0;
                        do {
                            wfAssignment = workflowManager.getAssignment(activityInstanceId);
                            if (wfAssignment == null) {
                                Thread.sleep(4000); //wait for assignment creation
                            }
                            count++;
                        } while (wfAssignment == null && count < 5); // try max 5 times
                        if (wfAssignment != null) {
                            String channel = getSlackUsername(username, wfAssignment);
                            if (channel != null && !channel.isEmpty()) {
                                message.setText(AppUtil.processHashVariable(text, wfAssignment, null, null));
                                message.setAttachments(new ArrayList<SlackAttachment>());
                                SlackAttachment attachment = new SlackAttachment();
                                attachment.setFallback(link);
                                if (urlName != null && !urlName.isEmpty()) {
                                    attachment.setTitle(AppUtil.processHashVariable(urlName, wfAssignment, null, null));
                                } else {
                                    attachment.setTitle(linkLabel);
                                }
                                attachment.setTitleLink(link);
                                message.addAttachments(attachment);
                                try {
                                    LogUtil.info(SlackNotification.class.getName(), "Sending slack message to " + username);
                                    sendMessage(channel, message);
                                    LogUtil.info(SlackNotification.class.getName(), "Sending slack message completed to " + username);
                                } catch (Exception ex) {
                                    LogUtil.error(UserNotificationAuditTrail.class.getName(), ex, "Error sending slack message");
                                }
                            }
                        } else {
                            LogUtil.debug(UserNotificationAuditTrail.class.getName(), "Fail to retrieve assignment for " + username);
                        }
                    }
                } catch (Exception e) {
                    LogUtil.error(UserNotificationAuditTrail.class.getName(), e, "Error executing plugin");
                }
            }
        }).start();
    }
    
    protected SlackApi getApi() {
        if (api == null) {
            api = new SlackApi(getPropertyString("apiurl"));
        }
        return api;
    }
    
    protected String getSlackUsername(String username, WorkflowAssignment assignment) {
        String syntax = getPropertyString("usernameTransform");
        syntax = syntax.replaceAll(StringUtil.escapeRegex("{username}"), StringUtil.escapeRegex(username));
        return AppUtil.processHashVariable(syntax, assignment, null, null);
    }
    
    protected void sendMessage(String channel, SlackMessage message) {
        if (message == null) {
            message = createMessage();
        }
        if (channel != null && !channel.isEmpty()) {
            message.setChannel(channel);
        }
        
        getApi().call(message);
    }
    
    protected SlackMessage createMessage() {
        SlackMessage message = new SlackMessage();
        
        String username = getPropertyString("username");
        if (!username.isEmpty()) {
            message.setUsername(username);
        }
        
        String customIcon = getPropertyString("customIcon");
        if (!customIcon.isEmpty()) {
            if ("joget".equals(customIcon)) {
                HttpServletRequest request = WorkflowUtil.getHttpServletRequest();
                if (request != null) {
                    String url = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() + "/images/v3/logo.png";
                    message.setIcon(url);
                }
            } else if ("url".equals(customIcon)) {
                message.setIcon(getPropertyString("iconUrl"));
            } else {
                message.setIcon(getPropertyString("iconEmoji"));
            }
        }
        
        message.setUnfurlLinks("true".equalsIgnoreCase(getPropertyString("unfurl_links")));
        message.setUnfurlMedia("true".equalsIgnoreCase(getPropertyString("unfurl_media")));
        
        return message;
    }

In our plugin properties, we have a button to send test message. Let implement the webService method to provide an API to send test message.在我们的插件属性中,我们有一个按钮来发送测试消息。让我们实现webService方法来提供一个API来发送测试消息。

Code Block
languagexml
    public void webService(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        boolean isAdmin = WorkflowUtil.isCurrentUserInRole(WorkflowUserManager.ROLE_ADMIN);
        if (!isAdmin) {
            response.sendError(HttpServletResponse.SC_UNAUTHORIZED);
            return;
        }
        
        String action = request.getParameter("action");
        if ("sendTestMessage".equals(action)) {
            String message = "";
            try {
                AppDefinition appDef = AppUtil.getCurrentAppDefinition();
                
                String url = AppUtil.processHashVariable(request.getParameter("url"), null, null, null, appDef);
                String testChannel = AppUtil.processHashVariable(request.getParameter("testChannel"), null, null, null, appDef);
                
                setProperty("apiurl", url);
                setProperty("text", AppPluginUtil.getMessage("SlackWebhookTool.testMessage", getClassName(), MESSAGE_PATH));
                
                if (testChannel != null && !testChannel.isEmpty()) {
                    sendMessage(testChannel, null);
                } else {
                    sendMessage(null, null);
                }
                
                message = AppPluginUtil.getMessage("SlackWebhookTool.sendTestMessage.success", getClassName(), MESSAGE_PATH);
            } catch (Exception e) {
                LogUtil.error(this.getClassName(), e, "Fail to send Test Message to Slack");
                message = AppPluginUtil.getMessage("SlackWebhookTool.sendTestMessage.fail", getClassName(), MESSAGE_PATH) + "\n" + StringEscapeUtils.escapeJavaScript(e.getMessage());
            }
            try {
                JSONObject jsonObject = new JSONObject();
                jsonObject.accumulate("message", message);
                jsonObject.write(response.getWriter());
            } catch (Exception e) {
                //ignore
            }
        } else {
            response.setStatus(HttpServletResponse.SC_NO_CONTENT);
        }
    }

c.

...

管理你的插件的依赖库

我们需要在我们的POM文件中包含“jsp-api”和“slack-webhook”库。

Code Block
        <!-- Change plugin specific dependencies here -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
        </dependency>
        <dependency>
            <groupId>net.gpedro.integrations.slack</groupId>
            <artifactId>slack-webhook</artifactId>
            <version>1.1.1</version>
        </dependency>
        <!-- End change plugin specific dependencies here -->

d.

...

We are using i18n message key in getLabel and getDescription method. We will use i18n message key in our properties options definition as well. Then, we will need to create a message resource bundle properties file for our plugin.

...

让你的插件国际化(国际化)

我们在getLabel和getDescription方法中使用i18n消息密钥。我们将在我们的属性选项定义中使用i18n消息密钥。然后,我们将需要为我们的插件创建一个消息资源包属性文件。

在“slack_webhook / src / main" directory. Then, create a "SlackWebhookTool.properties" file in the folder. In the properties file, add all the message keys and its label as below.main”目录下创建一个目录“resources / message”。然后,在该文件夹中创建一个“SlackWebhookTool.properties”文件。在属性文件中,添加所有消息密钥及其标签,如下所示。

Code Block
org.joget.SlackNotification.pluginLabel=Slack Notification
org.joget.SlackNotification.pluginDesc=Send notification message to Slack user when an assignment is available.
SlackNotification.config=Configure Slack Notification
SlackNotification.url=Webhook URL
SlackNotification.from=From
SlackNotification.fromUsername=Username
SlackNotification.fromUsername.value=Joget Workflow
SlackNotification.customIcon=Custom Icon
SlackNotification.customIcon.none=None
SlackNotification.customIcon.joget=Joget Workflow Logo
SlackNotification.customIcon.url=Image URL
SlackNotification.customIcon.emoji=Emoji Code
SlackNotification.to=To
SlackNotification.usernameTransform=Transform username to Slack username
SlackNotification.usernameTransform.desc=Hash Variable can be used to transform username to Slack username. Eg. @#form.slack.username[{username}]#
SlackNotification.usernameTransform.value=@{username}
SlackNotification.message=Message
SlackNotification.text=Text
SlackNotification.text.desc=Refer to <a href="https://api.slack.com/docs/formatting" target="_blank">Slack Message Formatting</a>.
SlackNotification.unfurl_links=Unfurling Links
SlackNotification.unfurl_links.desc=Automatically find URLs in a message and create attachments based on the content of those URLs
SlackNotification.unfurl_media=Unfurling Media
SlackNotification.unfurl_media.desc=Automatically find Media URLs in a message and create attachments based on the media of those URLs
SlackNotification.sendTestMessage=Send Test Message
SlackNotification.sendTestMessage.testChannel=Test Channel
SlackNotification.sendTestMessage.success=Test message sent.
SlackNotification.sendTestMessage.fail=Fail to sent test message. Error:
SlackNotification.testMessage=Test Message
SlackNotification.viewAssignment=View Assignment

e.

...

注册你的插件到Felix框架

接下来,我们将需要在Activator类(在同一个类包中自动生成)中注册我们的插件类,以告诉Felix框架这是一个插件。

Code Block
languagejava
    public void start(BundleContext context) {
        registrationList = new ArrayList<ServiceRegistration>();
        //Register plugin here
        registrationList.add(context.registerService(SlackNotification.class.getName(), new SlackNotification(), null));
    }

f.

...

构建它并测试

让我们建立我们的插件。构建过程完成后,我们将在“slack_notification / target”目录下找到一个“slack_notification-5.0.0.jar" file created under "slack_notification/target" directory.

Then, let's upload the plugin jar to Manage Plugins. After uploading the jar file, double check that the plugin is uploaded and activated correctly.

Image Removed

Check the Slack Notification plugin is available in 插件默认属性.

Image Removed

Now, let us configure the Incoming Webhooks in Slack platform.

...

jar”文件。

然后,让我们上传插件jar到  管理插件。上传jar文件后,再次检查插件是否正确上传并激活。

Image Added

检查 插件默认属性. 是否提供了Slack Notification插件。

Image Added

现在,让我们在Slack平台上配置Incoming Webhooks。

  1. 转到  your_team.slack.com/services/new.
  2. Search for Incoming WebHook and click in Add
  3. Choose Channel to Post and press 
  4. 搜索  传入WebHook  并点击 Add
  5. 选择要发布的频道并按 Add Incoming WebHooks Integration
  6. Into Setup Instructions, you've a WebHook URL. This is the argument will use for the "Webhook URL" later. Then, copy it.

...

  1. 进入  设置说明,你有一个WebHook网址。这是稍后将用于“ Webhook URL ” 的参数。然后,复制它。

配置Slack Notification插件。我们可以看到属性选项与用户通知插件非常相似。

When test running a process, the message is received in Slack once a new assignment is created.在测试运行一个进程时,一旦创建了一个新的任务,就会在Slack中接收到这个消息。

8.

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再进一步,分享或出售

您可以从 slack_notification_src.zip.To download the ready-to-use plugin jar, please find it in  下载源代码  

要下载现成的插件jar,请在  http://marketplace.joget.org/. (Coming Soon)

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