API access test

main.go

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"net/url"
)

var (
	hostName = "aerial-valor-93012.appspot.com"
)

type parameters struct {
	Token  string
	Values []json.Number
}

// This is really just a sequential execution of the task description without any cosmetics.
// considering: "we will not be examining your code for quality." :)
func main() {
	u := url.URL{
		Scheme: "http",
		Host:   hostName,
		Path:   "/challenge",
	}

	resp, err := http.Get(u.String())
	if err != nil {
		log.Println(err)
		return
	}

	if resp.StatusCode != http.StatusOK {
		log.Println("Failed to GET parameters")
		return
	}

	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Println(err)
		return
	}

	params := &parameters{}
	err = json.Unmarshal(body, params)
	if err != nil {
		log.Println(err)
		return
	}

	u.Path, err = generatePath(params)
	if err != nil {
		log.Println(err)
		return
	}

	resp, err = http.Get(u.String())
	if err != nil {
		log.Println(err)
		return
	}

	result, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Println(err)
		return
	}

	fmt.Println(string(result))
}

func generatePath(params *parameters) (string, error) {
	var n float64 // since not stated in the task, we use float64 to be on the safe side.
	for _, number := range params.Values {
		value, err := number.Float64()
		if err != nil {
			return "", err
		}
		n += value
	}

	return fmt.Sprintf("/challenge/%s/%v", params.Token, n), nil
}