go-urlshortener/urlshortener.go at master · mattn/go-urlshortener · GitHub

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package urlshortener

import (
	"bytes"
	"json"
	"http"
	"io/ioutil"
	"os"
	"strings"
)

func ShortenURL(longUrl string) (shortenUrl string, err os.Error) {
	var encbuf bytes.Buffer
	enc := json.NewEncoder(&encbuf)
	err = enc.Encode(map[string]string{"longUrl": longUrl})
	if err != nil {
		return
	}
	res, err := http.Post("https://www.googleapis.com/urlshortener/v1/url", "application/json", strings.NewReader(encbuf.String()))
	if err != nil {
		return
	}
	if res.StatusCode != 200 {
		err = os.NewError("failed to post")
		return
	}
	b, err := ioutil.ReadAll(res.Body)
	if err != nil {
		return
	}
	var decbuf bytes.Buffer
	decbuf.Write(b)
	dec := json.NewDecoder(&decbuf)
	var out map[string]interface{}
	err = dec.Decode(&out)
	if err != nil {
		return
	}
	shortenUrl = out["id"].(string)
	return
}

func ExpandURL(shortUrl string) (expandedUrl string, err os.Error) {
	param := http.EncodeQuery(map[string][]string{"shortUrl": {shortUrl}})
	res, _, err := http.Get("https://www.googleapis.com/urlshortener/v1/url?" + param)
	if err != nil {
		return
	}
	if res.StatusCode != 200 {
		err = os.NewError("failed to post")
		return
	}
	b, err := ioutil.ReadAll(res.Body)
	if err != nil {
		return
	}
	var decbuf bytes.Buffer
	decbuf.Write(b)
	dec := json.NewDecoder(&decbuf)
	var out map[string]interface{}
	err = dec.Decode(&out)
	if err != nil {
		return
	}
	expandedUrl = out["longUrl"].(string)
	return
}

type AnalyticsCount struct {
	Count string
	Id    string
}

type AnalyticsItem struct {
	ShortUrlClicks string
	LongUrlClicks  string
	Referrers      []AnalyticsCount
	Countries      []AnalyticsCount
	Browsers       []AnalyticsCount
	Platforms      []AnalyticsCount
}

type AnalyticsInfo struct {
	Kind      string
	Id        string
	LongUrl   string
	Status    string
	Created   string
	Analytics struct {
		AllTime  AnalyticsItem
		Month    AnalyticsItem
		Week     AnalyticsItem
		Day      AnalyticsItem
		TwoHours AnalyticsItem
	}
}

func AnalyticsURL(shortUrl string) (info AnalyticsInfo, err os.Error) {
	param := http.EncodeQuery(map[string][]string{"shortUrl": {shortUrl}, "projection": {"FULL"}})
	var res *http.Response
	res, _, err = http.Get("https://www.googleapis.com/urlshortener/v1/url?" + param)
	if err != nil {
		return
	}
	if res.StatusCode != 200 {
		err = os.NewError("failed to post")
		return
	}
	b, err := ioutil.ReadAll(res.Body)
	if err != nil {
		return
	}
	err = json.Unmarshal(b, &info)
	return
}