Asteroids - Feed Function

Author: Jeffrey Brown

gulpfile.js

@@ -2,3 +2,4 @@
 
 // export modules
 module.exports = require('./lib/apod.js')
+module.exports = require ('./lib/asteroids.js')

index.js

@@ -1,62 +1,67 @@
 // import libraries //
-const axios = require('axios');
-const Joi = require('joi');
-
-// define validation schema for payload processing //
-const validationSchema = Joi.object({
-  count: Joi.number().integer(),
-  date: Joi.date(),
-  end_date: Joi.date(),
-  key: Joi.string().required(),
-  start_date: Joi.date().less(Joi.ref('end_date')),
-  thumbs: Joi.boolean()
-});
-
-// NeoWs (Near Earth Object Web Service) //
-function asteroids(payload, callback) {
+const axios = require('axios')
+const Joi = require('joi')
+
+// import utilities //
+const dateUtils = require('../utils/dates.js')
 
-  // payload logic validation //
-  if (payload.end_date && !payload.start_date) throw new Error('Start Date must be included if using End Date');
+// neows (near earth object web service) //
+function asteroids(payload, callback) {
+  let request, start, end, key, type;
 
-  let request;
   // neo request type is feed //
   if (payload.type == 'feed') {
 
+    // define validation schema //
+    const validationSchema = Joi.object({
+      end_date: Joi.string().regex(/\d{4}-\d{2}-\d{2}/, { name: 'endDate' }).optional(),
+      key: Joi.string().required(),
+      start_date: Joi.string().regex(/\d{4}-\d{2}-\d{2}/, { name: 'startDate' }).optional(),
+      type: Joi.string().regex(/\w{4,6}/, { name: 'requestType' }).required(),
+    })
+
+    type = payload.type;
+    key = payload.key;
+
+    // validate the payload input //
+    const { error } = validationSchema.validate(payload)
+    if (error) throw error
+
+    // payload logic validation //
+    if (payload.end_date && (payload.start_date > payload.end_date)) throw  new Error('Start date cannot come after the end date provided')
+    if (payload.end_date && !payload.start_date) throw new Error('Start Date must be included if using End Date')
+
     // function to add days to a given date //
     function addDays(date, days) {
-      const res = new Date(Number(date));
+      let res = new Date(date);
       res.setDate(date.getDate() + days);
       return res;
     }
 
-
     // calculate seven days from the start date //
-    let endLimit = addDays(new Date(payload.start_date), 7);
+    let endLimit = addDays(dateUtils.formatStringToDate(payload.start_date), 7);
+    
+    // if there is no current end date, set the end date to the end limit (seven days from the start date) //
+    if (!payload.end_date) {
+      end = endLimit
+    } else {
+      end = new Date(payload.end_date);
+    }
 
     // throw an error if the end date is later than the cutoff date //
-    if (!(new Date(payload.end_date) < endLimit)) throw new Error ('Start and End dates cannot be more than seven days apart')
-
-    // define validation schema //
-    const validationSchema = Joi.object({
-      end_date: Joi.date(),
-      key: Joi.string().required(),
-      start_date: Joi.date().less(Joi.ref('end_date')),
-      type: Joi.string()
-    });
-
-    // validate the payload input //
-    const { error, value } = validationSchema.validate(payload);
-    if (error) throw error;
-
-    // calculate seven days from start_date //
+    if (end > endLimit) { 
+      throw new Error ('Start and End dates cannot be more than seven days apart')
+    }
 
+    // define url request parameters //
     let requestURLParameters = `api_key=${payload.key}`;
     if (payload.start_date) requestURLParameters = requestURLParameters.concat(`&start_date=${payload.start_date}`);
     if (payload.end_date) requestURLParameters = requestURLParameters.concat(`&end_date=${payload.end_date}`);
 
+    // define request url //
     request = `https://api.nasa.gov/neo/rest/v1/feed?${requestURLParameters}`;
-  } 
-
+    console.log(request)
+  }
 
   // neo request type is lookup //
   else if (payload.type == 'lookup') {
@@ -80,7 +85,6 @@ function asteroids(payload, callback) {
   else if (payload.type == 'browse') {
     let requestURLParameters = `api_key=${payload.key}`;
     request = `https://api.nasa.gov/neo/rest/v1/neo/browse/?${requestURLParameters}`;
-    
   }
 
   // api request //

lib/asteroids.js

@@ -1,11 +1,14 @@
 const celestial = require('./index');
 
-// get 10 random results //
+// get results for 04/20/2021 //
 const payload = {
+  end_date: '2021-04-27',
   key: 'DEMO_KEY',
-  count: 10,
+  start_date: '2021-04-20',
+  type: 'feed'
 };
 
-celestial.apod(payload, asteroids => {
-  console.log(asteroids);
-});
+celestial.asteroids(payload, neows => {
+  console.log(neows)
+  return neows;
+});

testing.js

@@ -0,0 +1,19 @@
+// global operational functions for controlling the format of dates //
+
+// function to take date as iso string and return in yyyy-mm-dd format //
+function formatDateToString(date) {
+  let year = date.getUTCFullYear()
+  let month = (date.getUTCMonth() + 1)
+  let day = date.getUTCDate()
+  return `${year}-${month}-${day}`
+}
+
+// function to take date as yyyy-mm-dd and return in iso format //
+function formatStringToDate(date) {
+  let res = new Date(date);
+  return res;
+}
+
+// export module //
+module.exports.formatDateToString = formatDateToString
+module.exports.formatStringToDate = formatStringToDate