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package nasa
import (
"encoding/json"
"fmt"
"io/ioutil"
"math/rand"
"net/http"
"regexp"
"time"
)
// APOD holds responses
type APOD struct {
Copyright string `json:"copyright"`
Date string `json:"date"`
Explanation string `json:"explanation"`
HDURL string `json:"hdurl"`
MediaType string `json:"media_type"`
ServiceVersion string `json:"service_version"`
Title string `json:"title"`
URL string `json:"url"`
Code int `json:"code"`
Msg string `json:"msg"`
}
// RandDate returns a random date between 1995-06-16 & today
func RandDate() string {
var (
min int64
max int64
sec int64
delta int64
date string
)
min = time.Date(1995, 6, 16, 0, 0, 0, 0, time.UTC).Unix()
max = time.Now().UTC().Unix()
delta = max - min
sec = rand.Int63n(delta) + min
date = time.Unix(sec, 0).Format("2006-01-02")
return date
}
// APODPath returns Astronomy Picture of the Day path
func APODPath(apodInfo map[string]string, timeout time.Duration) (APOD, error) {
var err error
apodRes := APOD{}
// validate date
re := regexp.MustCompile("((19|20)\\d\\d)-(0?[1-9]|1[012])-(0?[1-9]|[12][0-9]|3[01])")
if !re.MatchString(apodInfo["date"]) {
return apodRes, fmt.Errorf("%s does not match format 'YYYY-MM-DD'", apodInfo["date"])
}
client := http.Client{
Timeout: time.Second * timeout,
}
req, err := http.NewRequest(http.MethodGet, apodInfo["api"], nil)
if err != nil {
return apodRes, err
}
q := req.URL.Query()
q.Add("api_key", apodInfo["apiKey"])
q.Add("date", apodInfo["date"])
req.URL.RawQuery = q.Encode()
res, err := client.Do(req)
if err != nil {
fmt.Printf("Error: GET %s\n", apodInfo["api"])
return apodRes, err
}
defer res.Body.Close()
resBody, err := ioutil.ReadAll(res.Body)
if err != nil {
return apodRes, err
}
err = json.Unmarshal([]byte(resBody), &apodRes)
if err != nil {
return apodRes, err
}
if res.StatusCode != 200 {
return apodRes, fmt.Errorf("Unexpected response status code received: %d %s",
res.StatusCode, http.StatusText(res.StatusCode))
}
return apodRes, err
}
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