QX/DayOne.js

let isPremium = true; // if false, will use plus

let feature_enrollments = [{
    "id": 0,
    "feature": "publish",
    "createDate": "2011-11-11T00:00:00.000Z",
    "status": "active",
    "isActive": true
  },
  {
    "id": 0,
    "feature": "backup",
    "createDate": "2011-11-11T00:00:00.000Z",
    "status": "active",
    "isActive": true
  },
  {
    "id": 0,
    "feature": "sync",
    "createDate": "2011-11-11T00:00:00.000Z",
    "status": "active",
    "isActive": true
  }
]

let subscription = {
  "premium": isPremium,
  "plus_on_ios": true,
  "plus_on_mac": true,
  "source": [
    "Receipt"
  ],
  "auto_renew": false,
  "is_trial": false,
  "expires": (isPremium ? "2099-12-31T23:59:59.999Z" : null),
  "product_id": (isPremium ? "com.bloombuilt.dayoneios.subscription.premium.yearly" : null),
  "is_eligible_for_trial": true,
  "is_in_billing_retry_period": false
}

let bundle = {
  "bundleName": (isPremium ? "premium" : "grandfathered"),
  "reason": "purchase",
  "features": [{
      "name": "imagesPerEntry",
      "limit": (isPremium ? 30 : 10),
      "canUpgrade": !isPremium
    },
    {
      "name": "imagesPerSharedEntry",
      "limit": 30,
      "canUpgrade": false
    },
    {
      "name": "journalLimit",
      "limit": (isPremium ? 200 : 10),
      "canUpgrade": !isPremium
    },
    ...(isPremium ? [{
      "name": "audioPerEntry",
      "limit": 10,
      "canUpgrade": false
    }] : []),
    {
      "name": "sync",
      "limit": null,
      "canUpgrade": false
    },
    {
      "name": "backup",
      "limit": null,
      "canUpgrade": false
    },
    ...(!isPremium ? [{
      "name": "discountedSubscription",
      "limit": null,
      "canUpgrade": false
    }] : []),
    ...(isPremium ? [{
      "name": "printingDiscount",
      "limit": null,
      "canUpgrade": false
    }, {
      "name": "prioritySupport",
      "limit": null,
      "canUpgrade": false
    }, {
      "name": "drawingsPerEntry",
      "limit": 30,
      "canUpgrade": false
    }, {
      "name": "scanToPDF",
      "limit": 30,
      "canUpgrade": false
    }, {
      "name": "videosPerEntry",
      "limit": 30,
      "canUpgrade": false
    }, {
      "name": "journalViaSMS",
      "limit": null,
      "canUpgrade": false
    }] : [])
  ],
  "featuresFull": [{
      "name": "journalLimit",
      "limit": (isPremium ? 200 : 10),
      "canUpgrade": !isPremium
    },
    {
      "name": "backup",
      "enabled": true,
      "canUpgrade": false
    },
    {
      "name": "sync",
      "enabled": true,
      "canUpgrade": false
    },
    {
      "name": "discountedSubscription",
      "enabled": !isPremium,
      "canUpgrade": false
    },
    {
      "name": "printingDiscount",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "prioritySupport",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "scanToPDF",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "attachmentsPerEntry",
      "limit": (isPremium ? 30 : 10),
      "canUpgrade": !isPremium
    },
    {
      "name": "journalViaSMS",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "canAttachPhoto",
      "enabled": true,
      "canUpgrade": false
    },
    {
      "name": "canAttachVideo",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "canAttachAudio",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "canAttachDrawing",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "canAttachPDF",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "canAttachSharedPhoto",
      "enabled": true,
      "canUpgrade": false
    },
    {
      "name": "canAttachSharedVideo",
      "enabled": true,
      "canUpgrade": false
    },
    {
      "name": "canAttachSharedAudio",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "canAttachSharedDrawing",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "canAttachSharedPDF",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "attachmentsPerSharedEntry",
      "limit": 30,
      "canUpgrade": false
    },
    {
      "name": "instagram",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "ifttt",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "colors",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "emailToJournal",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "appIcons",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "moonPhase",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "foursquareNearbyVenues",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    },
    {
      "name": "createSharedJournal",
      "enabled": isPremium,
      "canUpgrade": !isPremium
    }
  ]
}

let account_status = {
  "subscriptionName": (isPremium ? "premium" : "grandfathered"),
  "bundleReason": "purchase",
  "expirationDate": (isPremium ? 4102415999999 : null),
  "giftedByName": null,
  "source": (isPremium ? "receipt" : "min")
}

async function onResponse(context, url, request, response) {
  response.headers["Content-Type"] = "application/json";
  response.statusCode = 200;
  response.statusPhrase = "OK";

  let body = response.body;

  if (url.includes("account-status")) { // /account-status
    body = account_status;
  } else { // /users OR /v2/users/receipt
    body.subscription = subscription;
    if (url.includes("v2")) { // /v2/users/receipt
      body.bundle = bundle;
    } else { // /users
      body.featureBundle = bundle;
      body.featureEnrollments = feature_enrollments;
    }
  }

  response.body = body;
  return response;
}


const isSurge = typeof $httpClient != "undefined";
const isQuanX = typeof $task != "undefined";
const isLoon = typeof $loon != "undefined";
const isJSBox = typeof $app != "undefined" && typeof $http != "undefined";
const isNode = typeof require == "function" && !isJSBox;

if (isSurge || isQuanX) {
  url = $request.url;

  $request.body = typeof $request.body != "undefined" ? JSON.parse($request.body) : {};
  $response.body = typeof $response.body != "undefined" ? JSON.parse($response.body) : {};

  response = onResponse(null, url, $request, $response);

  if (isQuanX) {
    $request.status = "HTTP/1.1 " + $request.statusCode + " " + $request.statusPhrase;
    $response.status = "HTTP/1.1 " + $response.statusCode + " " + $response.statusPhrase;
    $request.body = JSON.stringify($request.body);
    $response.body = JSON.stringify($response.body);
  }

  $done({
    status: $response.status,
    headers: $response.headers,
    body: $response.body
  });
}