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Lab 02 - Handling a Command

Objective

To create a function that handles a command coming from Slack.

NOTE: The weather API used in this lab will only be temporarily available and will have to be remplaced by another API after CASCON 2018 closes

References

https://console.bluemix.net/docs/services/Weather/weather_tutorials_samples.html#using_location_services

Steps

Modify the slackapp-command.js

  1. The weather can be obtained by calling the following API:
https://casconweather.mybluemix.net/weather?address=${address}

where the ${address} will be an address for which you want the weather.

Note that this API is a simplified API that does not require an API key or authentication which would be the case with a real API.

Inspire your code from the code created in the slackapp-command.js and call the API listed above, process the results and respond back to the user with the requested weather information.

Solution to call the Weather API:

  const getWeather = (address, callback) => {
    request({
      url: `https://casconweather.mybluemix.net/weather?address=${address}`,
      json: true
    }, (error, response, body) => {

      if (error) {
        return callback("Unable to connect to Cascon Weather Server");
      } else if (response.statusCode === 400) {
        return callback("Invalid geolocation.");
      } else if (response.statusCode === 200) {
        console.log("Response: ", response);
        console.log("Body: ", body);
        try {
          return callback(undefined, {
            message: body.message,
            address: body.address,
            summary: body.weatherSummary,
            temperature: body.temperature
          });
        } catch (e) {
          return callback(e);
        }
      }
    });
  };

Solution to provide a response:

// Reply to the message
function (registration, user, callback) {
    if (command.command === "/weather") {
    getWeather(command.text, (errorMessage2, resultingWeather) => {
        if (errorMessage2) {
        return callback(errorMessage2);
        }
        console.log("Before Reply: ", JSON.stringify(resultingWeather, undefined, 2));
        return callback(null, `Hey ${user.real_name}, the temperature at ${resultingWeather.address} is ${resultingWeather.summary} and ${resultingWeather.temperature} Celcius`);
    });
    } else {
    return callback("Un-implemented slash command!");
    }
}

Modify the deployment script

  1. Modify the deploy.sh script to include the command deployment (Uncomment the commands that refer to the slackapp-command.js)

  2. Reuse the parameters.json configurations previously prepared from lab0, copying it to the same directory as your deploy.sh

    cp ../../lab00-preparation/parameters.json .

  3. Deploy the command: ./deploy.sh --install

Create a new Slash command

  1. Go to https://api.slack.com and select Your apps

  2. Select your application

  3. Under Slash Commands, Create New Command

  4. Set the values

    1. Command: /weather

    2. Request URL: URL of the slackapp-command web action. The URL should look like https://us-south.functions.cloud.ibm.com/api/v1/web/your-org_your-space/slackapp/slackapp-command

    3. Short Description: A command that displays the weather for the address provided

    4. Usage Hint: [address]

  5. Save

  6. If you see the following prompt (yellow), click the link to reinstall the app

  7. And confirm the identity of the service by clicking Authorize

  8. Navigate to your Slack workspace and test your newly created Slash Command by typing

    /weather <some city>

    The Slash command executes and returns the weather for the city specified and responds with a message that looks:

    Hey <user name>, the temperature at <city> is <weather information returned>

Next Step

You are now ready to continue with one of the following: