Google Chat でスラッシュ コマンドに応答する

// The ID of the slash command "/about".
// It's not enabled by default, set to the actual ID to enable it. You must
// use the same ID as set in the Google Chat API configuration.
const ABOUT_COMMAND_ID = 0;

/**
 * Google Cloud Function that responds to events sent from a
 * Google Chat space.
 *
 * @param {Object} req Request sent from Google Chat space
 * @param {Object} res Response to send back
 */
exports.avatarApp = function avatarApp(req, res) {
    if (req.method === 'GET' || !req.body.chat) {
        return res.send('Hello! This function is meant to be used ' +
            'in a Google Chat Space.');
    }
    // Stores the Google Chat event as a variable.
    const chatEvent = req.body.chat;

    // Handles APP_COMMAND events
    if (chatEvent.appCommandPayload) {

        // Stores the Google Chat app command metadata as a variable.
        const appCommandMetadata = chatEvent.appCommandPayload.appCommandMetadata;

        if (appCommandMetadata.appCommandType === "SLASH_COMMAND") {
            // Executes the slash command logic based on its ID.
            // Slash command IDs are set in the Google Chat API configuration.
            switch (appCommandMetadata.appCommandId) {
                case ABOUT_COMMAND_ID:
                    return res.send({ hostAppDataAction: { chatDataAction: { createMessageAction: { message: {
                        text: 'The Avatar app replies to Google Chat messages.'
                    }}}}});
            }
        }
    // Handles MESSAGE events
    } else if (chatEvent.messagePayload) {

        // Stores the Google Chat event as a variable.
        const chatMessage = chatEvent.messagePayload.message;

        // Replies with the sender's avatar in a card otherwise.
        const displayName = chatMessage.sender.displayName;
        const avatarUrl = chatMessage.sender.avatarUrl;
        res.send({ hostAppDataAction: { chatDataAction: { createMessageAction: { message: {
            text: 'Here\'s your avatar',
            cardsV2: [{
                cardId: 'avatarCard',
                card: {
                    name: 'Avatar Card',
                    header: {
                        title: `Hello ${displayName}!`,
                    },
                    sections: [{
                        widgets: [{
                            textParagraph: { text: 'Your avatar picture: ' }
                        }, {
                            image: { imageUrl: avatarUrl }
                        }]
                    }]
                }
            }]
        }}}}});
    }
};

// The ID of the slash command "/about".
// It's not enabled by default, set to the actual ID to enable it. You must
// use the same ID as set in the Google Chat API configuration.
const ABOUT_COMMAND_ID = 0;

/**
 * Responds to a MESSAGE event in Google Chat.
 *
 * @param {Object} event the event object from Google Chat
 */
function onMessage(event) {

    // Stores the Google Chat event as a variable.
    const chatMessage = event.chat.messagePayload.message;

    // Replies with the sender's avatar in a card otherwise.
    const displayName = chatMessage.sender.displayName;
    const avatarUrl = chatMessage.sender.avatarUrl;
    return { hostAppDataAction: { chatDataAction: { createMessageAction: { message: {
        text: 'Here\'s your avatar',
        cardsV2: [{
            cardId: 'avatarCard',
            card: {
                name: 'Avatar Card',
                header: {
                    title: `Hello ${displayName}!`,
                },
                sections: [{
                    widgets: [{
                        textParagraph: { text: 'Your avatar picture: ' }
                    }, {
                        image: { imageUrl: avatarUrl }
                    }]
                }]
            }
        }]
    }}}}};
}

/**
 * Responds to an APP_COMMAND event in Google Chat.
 *
 * @param {Object} event the event object from Google Chat
 */
function onAppCommand(event) {

    // Stores the Google Chat app command metadata as a variable.
    const appCommandMetadata = event.chat.appCommandPayload.appCommandMetadata;

    if (appCommandMetadata.appCommandType == "SLASH_COMMAND") {

        // Executes the slash command logic based on its ID.
        // Slash command IDs are set in the Google Chat API configuration.
        switch (appCommandMetadata.appCommandId) {
            case ABOUT_COMMAND_ID:
                return { hostAppDataAction: { chatDataAction: { createMessageAction: { message: {
                    text: 'The Avatar app replies to Google Chat messages.'
                }}}}};
        }
    }
}