Pebble Master Key

Master Key makes it easier than ever to ask your users to provide their own API keys for services with strict rate-limits. Rather than asking for a long Weather Underground API Key, for example, all you need from your user is their email address and 5-digit Master Key PIN. Requirements
The only requirements for integrating Master Key into your app are to:
• Include "pmkey.xyz" in your Appstore Description so that your watchface or app shows up when users search for Master Key-enabled watchfaces or apps.
• Not abuse the API by attempting to scrape or manipulate data in any way. This API is a free service for the benefit of Pebble developers and users, and will be shut down if it is abused. API Endpoint
To get the relevant API keys, simply call the following URL via HTTP GET, passing the user's email and PIN as parameters:

https://pmkey.xyz/search/[email protected]&pin=10000

The JSON response will look like the following:

  {
    "success" : true,
    "lastUpdated" : "2016-06-02 14:25:42",
    "keys" : {
      "weather" : {
        "owm" : "OWM-API-KEY",
        "wu" : "WU-API-KEY",
        "forecast" : "FORECAST-API-KEY"
      },
      "web" : {
        "ifttt" : "IFTTT-MAKER-KEY",
        "wolfram" : "WOLFRAM-API-KEY"
      },
      "pebble" : {
        "habits" : "MY-HABITS-API-KEY"
      }
    }
  }

Keep in mind that any one of these keys could be returned as an empty string, or null if the user has created an account but not attempted to save any API keys.

If there is an error with your request, the JSON response will look like the following:

  {
    "success" : false,
    "error" : "Could not locate any keys for that PIN."
  }

Simple Settings Page Example
Below is the Javascript code for a simple implementation of Master Key, using the "webviewclosed" event handler in PebbleKit JS.

  Pebble.addEventListener("webviewclosed", function(e){
    //Use the provided Master Key PIN to get relevant API keys, 
    //then store in localstorage.
    var config = JSON.parse(decodeURIComponent(e.response));

    var xhr = new XMLHttpRequest();
    var url = "https://pmkey.xyz/search/?email=" + config.Email + "&pin=" + config.MasterKeyPIN;
  
    xhr.open("GET", url, true);
  
    xhr.onreadystatechange = function(){
      if(xhr.readyState == 4 && xhr.status == 200){
        var result = JSON.parse(xhr.responseText);
        if(result.success && result.keys.weather.wu !== ""){
          localStorage.setItem("wuKey", result.keys.weather.wu);
        }
      }
    };
  
    xhr.send();
  }

Advanced Settings Page Example
Below is HTML and Javascript code for a more advanced implementation of Master Key, using Slate, directly in your Settings page.

  <html>
    <head>
      <title>My App Settings</title>
      <link rel="stylesheet" href="/dist/css/slate.min.css">
      <script type="text/javascript" src="/dist/js/slate.min.js"></script>
    </head>
    <body>
      <div class="item-container">
        <div class="item-container-content">
          <div class="item">
            Master Key allows your favorite Pebble watchfaces and apps to grab all your API keys via email and a simple 5-digit PIN code.<br />
            To sign up, visit the Pebble Master Key Website (pmkey.xyz).
          </div>
          <label class="item">
            <div class="item-input-wrapper item-input-wrapper-button">
              <input type="text" class="item-input" id="email">
            </div>
            <div class="item-input-wrapper item-input-wrapper-button">
              <input type="number" class="item-input" id="master">
            </div>
            <input type="button" class="item-button item-input-button" id="master-button" onclick="sync" value="SYNC">
          </label>
        </div>
        <label class="item">
          <div class="item-input-wrapper">
            <input type="text" class="item-input" id="wu">
          </div>
        </label>
      </div>

      <script>
        function sync(){
          var xhr = new XMLHttpRequest();
          var url = "https://pmkey.xyz/search/?email=" document.getElementById("email").value + "&pin=" + document.getElementById("master").value;

          xhr.open("GET", url, true);

          var masterSync = document.getElementById("master-button");
          masterSync.value = "LOADING...";

          xhr.onreadystatechange = function(){
            if(xhr.readyState == 4 && xhr.status == 200){
              if(result.success){
                masterSync.value = "SUCCESS";
                document.getElementById("wu").value = result.keys.weather.wu;
              }
              else{
                masterSync.value = "FAIL";
              }
            }
          };
        }
      </script>
    </body>
  </html>