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apod.go
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apod.go
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package apod
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"strings"
)
// NewAPOD returns an APOD with the specified API Key.
// If no API Key is given we use the DEMO_KEY.
func NewAPOD(key ...string) *APOD {
apiKey := "DEMO_KEY"
if len(key) > 0 {
apiKey = key[0]
}
return &APOD{
apiUrl: fmt.Sprintf("https://api.nasa.gov/planetary/apod?api_key=%s", apiKey),
}
}
// Query takes an ApodQueryInput and returns an slice of ApodQueryOutput
func (a *APOD) Query(queryParams *ApodQueryInput) ([]ApodQueryOutput, error) {
var queryOutput []ApodQueryOutput
// It doesn't matter what the value of thumbs is so we always include it.
// If the user leaves it blank it defaults to false.
queryUrl := fmt.Sprintf("%s&thumbs=%t", a.apiUrl, queryParams.Thumbs)
if queryParams.Count != 0 {
if !queryParams.Date.IsZero() || !queryParams.StartDate.IsZero() || !queryParams.EndDate.IsZero() {
return queryOutput, fmt.Errorf("cannot use the following params with 'Count': 'Date', 'StartDate', 'EndDate'")
}
queryUrl += fmt.Sprintf("&count=%d", queryParams.Count)
}
if !queryParams.Date.IsZero() {
if !queryParams.StartDate.IsZero() || !queryParams.EndDate.IsZero() {
return queryOutput, fmt.Errorf("cannot use params 'Date' and 'StartDate' or 'EndDate' together")
}
queryUrl += fmt.Sprintf("&date=%s", queryParams.Date.Format("2006-01-02"))
}
if !queryParams.StartDate.IsZero() {
queryUrl += fmt.Sprintf("&start_date=%s", queryParams.StartDate.Format("2006-01-02"))
}
if !queryParams.EndDate.IsZero() {
queryUrl += fmt.Sprintf("&end_date=%s", queryParams.EndDate.Format("2006-01-02"))
}
// Do the actual query
resp, err := http.Get(queryUrl)
if err != nil {
return queryOutput, err
}
defer resp.Body.Close()
if resp.Header.Get("X-RateLimit-Remaining") == "0" {
return queryOutput, fmt.Errorf("you have exceeded your rate limit")
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return queryOutput, err
}
// Sometimes the header doesn't update properly so we have a second check for this here.
if strings.Contains(string(body), "You have exceeded your rate limit.") {
return queryOutput, fmt.Errorf("you have exceeded your rate limit")
}
// Since we're always returning an array we have to do a check for if it's not returning an array
// We get the results, append to an empty array, and then return it back to the user.
if !queryParams.Date.IsZero() {
var queryOutputSingle ApodQueryOutput
err = json.Unmarshal(body, &queryOutputSingle)
queryOutput = append(queryOutput, queryOutputSingle)
} else {
err = json.Unmarshal(body, &queryOutput)
}
return queryOutput, err
}