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 messages 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 chatMessage = req.body.chat.messagePayload.message;

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

    // 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;

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

    // 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 }
                    }]
                }]
            }
        }]
    }}}}};
}