teaplanet · December 19, 2015 12:58
diff --git a/main.go b/main.go
 package main

 import (
 	"fmt"
 	"net/http"
 	"html/template"
 	"code.google.com/p/goauth2/oauth"
 )

 var notAuthenticatedTemplate = template.Must(template.New("").Parse(`
 <html><body>
 You have currently not given permissions to access your data. Please authenticate this app with the Google OAuth provider.
 <form action="/auth/google" method="POST"><input type="submit" value="Ok, authorize this app with my id"/></form>
 </body></html>
 `))

 var userInfoTemplate = template.Must(template.New("").Parse(`
 <html><body>
 This app is now authenticated to access your Google user info.  Your details are:<br />
 {{.}}
 </body></html>
 `))

 // variables used during oauth protocol flow of authentication
 var (
 	code = ""
 	token = ""
 )

 var oauthCfg = &oauth.Config {
 	//TODO: put your project's Client Id here.  To be got from https://code.google.com/apis/console
 	ClientId: "CLIENT ID",

 	//TODO: put your project's Client Secret value here https://code.google.com/apis/console
 	ClientSecret: "CLIENT SECRET",

 	//For Google's oauth2 authentication, use this defined URL
 	AuthURL: "https://accounts.google.com/o/oauth2/auth",

 	//For Google's oauth2 authentication, use this defined URL
 	TokenURL: "https://accounts.google.com/o/oauth2/token",

 	//To return your oauth2 code, Google will redirect the browser to this page that you have defined
 	//TODO: This exact URL should also be added in your Google API console for this project within "API Access"->"Redirect URIs"
 	RedirectURL: "http://localhost:3000/auth/google/callback",

 	//This is the 'scope' of the data that you are asking the user's permission to access. For getting user's info, this is the url that Google has defined.
 	//	Scope: "https://www.googleapis.com/auth/userinfo.profile",
 	Scope: "https://www.googleapis.com/auth/userinfo.profile https://www.googleapis.com/auth/userinfo.email https://www.googleapis.com/auth/calendar.readonly",
 }

 //This is the URL that Google has defined so that an authenticated application may obtain the user's info in json format
 const profileInfoURL = "https://www.googleapis.com/oauth2/v1/userinfo?alt=json"

 func main() {
 	fmt.Println("start")
 	http.HandleFunc("/", handleRoot)
 	http.HandleFunc("/auth/google", handleAuthorize)

 	//Google will redirect to this page to return your code, so handle it appropriately
 	http.HandleFunc("/auth/google/callback", handleOAuth2Callback)

 	fmt.Println("listen:3000")
 	http.ListenAndServe("localhost:3000", nil)
 }

 func handleRoot(w http.ResponseWriter, r *http.Request) {
 	notAuthenticatedTemplate.Execute(w, nil)
 }

 // Start the authorization process
 func handleAuthorize(w http.ResponseWriter, r *http.Request) {
 	//Get the Google URL which shows the Authentication page to the user
 	url := oauthCfg.AuthCodeURL("")

 	//redirect user to that page
 	http.Redirect(w, r, url, http.StatusFound)
 }

 // Function that handles the callback from the Google server
 func handleOAuth2Callback(w http.ResponseWriter, r *http.Request) {
 	//Get the code from the response
 	code := r.FormValue("code")

 	t := &oauth.Transport{Config: oauthCfg}

 	// Exchange the received code for a token
 	t.Exchange(code)

 	//now get user data based on the Transport which has the token
 	resp, _ := t.Client().Get(profileInfoURL)

 	buf := make([]byte, 1024)
 	resp.Body.Read(buf)
 	userInfoTemplate.Execute(w, string(buf))
 }
	package main

	import (
	"fmt"
	"net/http"
	"html/template"
	"code.google.com/p/goauth2/oauth"
	)

	var notAuthenticatedTemplate = template.Must(template.New("").Parse(`
	<html><body>
	You have currently not given permissions to access your data. Please authenticate this app with the Google OAuth provider.
	<form action="/auth/google" method="POST"><input type="submit" value="Ok, authorize this app with my id"/></form>
	</body></html>
	`))

	var userInfoTemplate = template.Must(template.New("").Parse(`
	<html><body>
	This app is now authenticated to access your Google user info. Your details are:<br />
	{{.}}
	</body></html>
	`))

	// variables used during oauth protocol flow of authentication
	var (
	code = ""
	token = ""
	)

	var oauthCfg = &oauth.Config {
	//TODO: put your project's Client Id here. To be got from https://code.google.com/apis/console
	ClientId: "CLIENT ID",

	//TODO: put your project's Client Secret value here https://code.google.com/apis/console
	ClientSecret: "CLIENT SECRET",

	//For Google's oauth2 authentication, use this defined URL
	AuthURL: "https://accounts.google.com/o/oauth2/auth",

	//For Google's oauth2 authentication, use this defined URL
	TokenURL: "https://accounts.google.com/o/oauth2/token",

	//To return your oauth2 code, Google will redirect the browser to this page that you have defined
	//TODO: This exact URL should also be added in your Google API console for this project within "API Access"->"Redirect URIs"
	RedirectURL: "http://localhost:3000/auth/google/callback",

	//This is the 'scope' of the data that you are asking the user's permission to access. For getting user's info, this is the url that Google has defined.
	// Scope: "https://www.googleapis.com/auth/userinfo.profile",
	Scope: "https://www.googleapis.com/auth/userinfo.profile https://www.googleapis.com/auth/userinfo.email https://www.googleapis.com/auth/calendar.readonly",
	}

	//This is the URL that Google has defined so that an authenticated application may obtain the user's info in json format
	const profileInfoURL = "https://www.googleapis.com/oauth2/v1/userinfo?alt=json"

	func main() {
	fmt.Println("start")
	http.HandleFunc("/", handleRoot)
	http.HandleFunc("/auth/google", handleAuthorize)

	//Google will redirect to this page to return your code, so handle it appropriately
	http.HandleFunc("/auth/google/callback", handleOAuth2Callback)

	fmt.Println("listen:3000")
	http.ListenAndServe("localhost:3000", nil)
	}

	func handleRoot(w http.ResponseWriter, r *http.Request) {
	notAuthenticatedTemplate.Execute(w, nil)
	}

	// Start the authorization process
	func handleAuthorize(w http.ResponseWriter, r *http.Request) {
	//Get the Google URL which shows the Authentication page to the user
	url := oauthCfg.AuthCodeURL("")

	//redirect user to that page
	http.Redirect(w, r, url, http.StatusFound)
	}

	// Function that handles the callback from the Google server
	func handleOAuth2Callback(w http.ResponseWriter, r *http.Request) {
	//Get the code from the response
	code := r.FormValue("code")

	t := &oauth.Transport{Config: oauthCfg}

	// Exchange the received code for a token
	t.Exchange(code)

	//now get user data based on the Transport which has the token
	resp, _ := t.Client().Get(profileInfoURL)

	buf := make([]byte, 1024)
	resp.Body.Read(buf)
	userInfoTemplate.Execute(w, string(buf))
	}
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