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onwater.go
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/
onwater.go
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package onwater
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/http"
"os"
)
const apiEndpoint = "https://api.onwater.io/api/v1/results/"
// Client struct
type Client struct {
apiKey string
}
// New client initalizes and returns new Client object that you can use to make API calls.
// If apiKey is empty, it tries to load key from $ONWATER_API_KEY environment variable.
func New(apiKey string) *Client {
if apiKey == "" {
apiKey = os.Getenv("ONWATER_API_KEY")
}
return &Client{apiKey}
}
// OnWater makes an API call and returns true if lat/lng is on water.
func (c *Client) OnWater(ctx context.Context, lat float64, lng float64) (bool, error) {
url := fmt.Sprintf("%s/%v,%v", apiEndpoint, lat, lng)
if c.apiKey != "" {
url += "?access_token=" + c.apiKey
}
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return false, err
}
if ctx != nil {
req = req.WithContext(ctx)
}
req.Header.Add("User-Agent", "github.com/andy/onwater-1.0.0")
res, err := http.DefaultClient.Do(req)
if err != nil {
return false, err
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
return false, errors.New(res.Status)
}
var reply struct {
Lat float32 `json:"lat"`
Lon float32 `json:"lon"`
Water bool `json:"water"`
}
if err := json.NewDecoder(res.Body).Decode(&reply); err != nil {
return false, err
}
return reply.Water, nil
}
// OnLand returns true if lat/lng is on land
func (c *Client) OnLand(ctx context.Context, lat float64, lng float64) (bool, error) {
ok, err := c.OnWater(ctx, lat, lng)
if err != nil {
return ok, err
}
return !ok, err
}