9.3. 创建自定义连接器

在 Editor 视图中打开 syndesis-extension-definition.json 文件，编写定义全局属性的代码，自定义连接器可以执行的操作以及每个操作的属性。

每个 全局 属性都对应 Fuse Online 中的连接配置参数。每个 action 属性都对应于 Fuse Online connection action 配置参数。在 Fuse Online 中，当用户选择自定义连接器时，Fuse Online 会提示输入每个连接配置参数的值。自定义连接器可用于使用 OAuth 协议的应用程序。在这种情况下，请确保为 OAuth 客户端 ID 指定全局属性，以及 OAuth 客户端 secret 的另一个全局属性。Fuse Online 用户需要为这些参数指定值，以便从此连接器创建的连接正常工作。

每个连接器操作都会 声明一个基本 Camel 组件方案。

New Fuse Online Extension Project 向导提供的示例使用 telegram Camel 组件方案：

{
  "schemaVersion" : "v1",
  "name" : "Example Fuse Online Extension",
  "extensionId" : "fuse.online.extension.example",
  "version" : "1.0.0",
  "actions" : [ {
    "id" : "io.syndesis:telegram-chat-from-action",
    "name" : "Chat Messages",
    "description" : "Receive all messages sent to the chat bot",
    "descriptor" : {
      "componentScheme" : "telegram",
      "inputDataShape" : {
        "kind" : "none"
      },
      "outputDataShape" : {
        "kind" : "java",
        "type" : "org.apache.camel.component.telegram.model.IncomingMessage"
      },
      "configuredProperties" : {
        "type" : "bots"
      }
    },
    "actionType" : "connector",
    "pattern" : "From"
  }, {
    "id" : "io.syndesis:telegram-chat-to-action",
    "name" : "Send a chat Messages",
    "description" : "Send messages to the chat (through the bot).",
    "descriptor" : {
      "componentScheme" : "telegram",
      "inputDataShape" : {
        "kind" : "java",
        "type" : "java.lang.String"
      },
      "outputDataShape" : {
        "kind" : "none"
      },
      "propertyDefinitionSteps" : [ {
        "description" : "Chat id",
        "name" : "chatId",
        "properties" : {
          "chatId" : {
            "kind" : "parameter",
            "displayName" : "Chat Id",
            "type" : "string",
            "javaType" : "String",
            "description" : "The telegram's Chat Id, if not set will use CamelTelegramChatId from the incoming exchange."
          }
        }
      } ],
      "configuredProperties" : {
        "type" : "bots"
      }
    },
    "actionType" : "connector",
    "pattern" : "To"
  } ],
  "properties" : {
    "authorizationToken" : {
      "kind" : "property",
      "displayName" : "Authorization Token",
      "group" : "security",
      "label" : "security",
      "required" : true,
      "type" : "string",
      "javaType" : "java.lang.String",
      "secret" : true,
      "description" : "Telegram Bot Authorization Token"
    }
  }
}

如果自定义连接器需要额外的依赖项，请将它们添加到项目的 pom.xml 文件中。依赖项的默认范围是 runtime。如果您添加了红帽提供的依赖项，请自行定义其范围，例如：

<dependencies>
    <dependency>
          <groupId>org.apache.camel</groupId>
          <artifactId>camel-telegram</artifactId>
          <scope>provided</scope>
    </dependency>
      </dependencies>