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Go example of working with google api url shortener.
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// Follow instructions here to create credentials to access google api shortener service: | |
// https://developers.google.com/identity/protocols/application-default-credentials | |
// I set the env variable GOOGLE_APPLICATION_CREDENTIALS with the path of the json credential file. | |
package main | |
import ( | |
"fmt" | |
"golang.org/x/net/context" | |
"golang.org/x/oauth2/google" | |
"google.golang.org/api/urlshortener/v1" | |
"net/http" | |
"text/template" | |
) | |
func main() { | |
http.HandleFunc("/", handleRoot) | |
http.HandleFunc("/shorten", handleShorten) | |
http.HandleFunc("/lengthen", handleLengthen) | |
http.ListenAndServe("localhost:8080", nil) | |
} | |
var rootHtmlTmpl = template.Must(template.New("rootHtml").Parse(` | |
<html><body> | |
<h1>My URL Shrtnr</h1> | |
{{if .}}{{.}}<br /><br />{{end}} | |
<form action="/shorten" type="POST"> | |
Shorten this: <input type="text" name="longUrl" /> | |
<input type="submit" value="Give me short URL" /> | |
</form> | |
<br /> | |
<form action="/lengthen" type="POST"> | |
Expand this: http://goo.gl/<input type="text" name="shortUrl" /> | |
<input type="submit" value="Give me long URL" /> | |
</form> | |
</body></html> | |
`)) | |
func handleRoot(w http.ResponseWriter, r *http.Request) { | |
rootHtmlTmpl.Execute(w, nil) | |
} | |
func handleShorten(w http.ResponseWriter, r *http.Request) { | |
longUrl := r.FormValue("longUrl") | |
ctx := context.Background() | |
client, err := google.DefaultClient(ctx, urlshortener.UrlshortenerScope) | |
if err != nil { | |
fmt.Printf("Error: %s", err.Error()) | |
return | |
} | |
urlshortenerSvc, _ := urlshortener.New(client | |
url, _ := urlshortenerSvc.Url.Insert(&urlshortener.Url{LongUrl: longUrl}).Do() | |
rootHtmlTmpl.Execute(w, fmt.Sprintf("Shortened version of `%s` is: %s", longUrl, url.Id)) | |
} | |
func handleLengthen(w http.ResponseWriter, r *http.Request) { | |
shortUrl := "http://goo.gl/" + r.FormValue("shortUrl") | |
ctx := context.Background() | |
client, err := google.DefaultClient(ctx, urlshortener.UrlshortenerScope) | |
if err != nil { | |
fmt.Printf("Error: %s", err.Error()) | |
return | |
} | |
urlshortenerSvc, _ := urlshortener.New(client) | |
url, _ := urlshortenerSvc.Url.Get(shortUrl).Do() | |
rootHtmlTmpl.Execute(w, fmt.Sprintf("Longer version of %s is: %s", shortUrl, url.LongUrl)) | |
} |
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