IndianGuru/githuboq.go

## githuboq.go
package main

import (
	"fmt"
	"net/http"

	"github.com/google/go-github/github"
	"golang.org/x/oauth2"
	githuboauth "golang.org/x/oauth2/github"
	"html/template"
)

var (
	// You must register the app at https://github.com/settings/applications
	// Set callback to http://127.0.0.1:7000/githuboa_cb
	// Set ClientId and ClientSecret to the values you got
	// after registering your app
	oauthConf = &oauth2.Config{
		ClientID:     "00dd2026980943db89e3",
		ClientSecret: "199a2a05e29f30c547e1525c549bf89d3bdbc51c",

		// select level of access you want https://developer.github.com/v3/oauth/#scopes
		Scopes: []string{"user:email"},

		// Endpoint contains the resource server's token endpoint
		// URLs. These are constants specific to each server and are
		// often available via site-specific packages, such as
		// google.Endpoint or github.Endpoint.
		Endpoint: githuboauth.Endpoint,
	}
	// An unguessable random string. It is used to protect against
	// cross-site request forgery attacks
	oauthStateString = "arandomstring"
)

const htmlIndex = `<html><body><p>Well, hello there!</p>
<p>We're going to now talk to the GitHub API. Ready?</p>
<p>Log into <a href="/login">GitHub</a></p>
</body></html>
`

var userInfoTemplate = template.Must(template.New("").Parse(`
<html><body>
<p>This app is now authenticated to access your GitHub user info.</p>
<p>User details are:</p><p>
{{.}}
</p>
<p>That's it!</p>
</body></html>
`))

func main() {
	http.HandleFunc("/", handleMain)
	http.HandleFunc("/login", handleGitHubLogin)
	http.HandleFunc("/githuboa_cb", handleGitHubCallback)

	fmt.Print("Started running on http://127.0.0.1:7000\n")
	fmt.Println(http.ListenAndServe(":7000", nil))
}

func handleMain(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	w.WriteHeader(http.StatusOK)
	w.Write([]byte(htmlIndex))
}

// /login
func handleGitHubLogin(w http.ResponseWriter, r *http.Request) {
	url := oauthConf.AuthCodeURL(oauthStateString, oauth2.AccessTypeOnline)
	http.Redirect(w, r, url, http.StatusTemporaryRedirect)
}

// githuboa_cb. Called by github after authorization is granted
func handleGitHubCallback(w http.ResponseWriter, r *http.Request) {
	// If the user accepts your request, GitHub redirects back
	// to your site with a temporary code in a code parameter
	// as well as the state you provided in the previous step
	// in a state parameter. If the states don't match, the
	// request has been created by a third party and the process
	// should be aborted.
	state := r.FormValue("state")
	if state != oauthStateString {
		fmt.Printf("invalid oauth state, expected '%s', got '%s'\n", oauthStateString, state)
		http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
		return
	}

	code := r.FormValue("code")

	// On success, exchange this for an access token
	token, err := oauthConf.Exchange(oauth2.NoContext, code)
	if err != nil {
		fmt.Printf("oauthConf.Exchange() failed with '%s'\n", err)
		http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
		return
	}

	oauthClient := oauthConf.Client(oauth2.NoContext, token)

	// https://godoc.org/github.com/google/go-github/github
	client := github.NewClient(oauthClient)

	user, _, err := client.Users.Get("")
	if err != nil {
		fmt.Printf("client.Users.Get() failed with '%s'\n", err)
		http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
		return
	}

	buf := []string{"GitHub login id: ", *user.Login, "| GitHub email id: ", *user.Email}

	userInfoTemplate.Execute(w, buf)
}
	package main

	import (
	"fmt"
	"net/http"

	"github.com/google/go-github/github"
	"golang.org/x/oauth2"
	githuboauth "golang.org/x/oauth2/github"
	"html/template"
	)

	var (
	// You must register the app at https://github.com/settings/applications
	// Set callback to http://127.0.0.1:7000/githuboa_cb
	// Set ClientId and ClientSecret to the values you got
	// after registering your app
	oauthConf = &oauth2.Config{
	ClientID: "00dd2026980943db89e3",
	ClientSecret: "199a2a05e29f30c547e1525c549bf89d3bdbc51c",

	// select level of access you want https://developer.github.com/v3/oauth/#scopes
	Scopes: []string{"user:email"},

	// Endpoint contains the resource server's token endpoint
	// URLs. These are constants specific to each server and are
	// often available via site-specific packages, such as
	// google.Endpoint or github.Endpoint.
	Endpoint: githuboauth.Endpoint,
	}
	// An unguessable random string. It is used to protect against
	// cross-site request forgery attacks
	oauthStateString = "arandomstring"
	)

	const htmlIndex = `<html><body><p>Well, hello there!</p>
	<p>We're going to now talk to the GitHub API. Ready?</p>
	<p>Log into <a href="/login">GitHub</a></p>
	</body></html>
	`

	var userInfoTemplate = template.Must(template.New("").Parse(`
	<html><body>
	<p>This app is now authenticated to access your GitHub user info.</p>
	<p>User details are:</p><p>
	{{.}}
	</p>
	<p>That's it!</p>
	</body></html>
	`))

	func main() {
	http.HandleFunc("/", handleMain)
	http.HandleFunc("/login", handleGitHubLogin)
	http.HandleFunc("/githuboa_cb", handleGitHubCallback)

	fmt.Print("Started running on http://127.0.0.1:7000\n")
	fmt.Println(http.ListenAndServe(":7000", nil))
	}

	func handleMain(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	w.WriteHeader(http.StatusOK)
	w.Write([]byte(htmlIndex))
	}

	// /login
	func handleGitHubLogin(w http.ResponseWriter, r *http.Request) {
	url := oauthConf.AuthCodeURL(oauthStateString, oauth2.AccessTypeOnline)
	http.Redirect(w, r, url, http.StatusTemporaryRedirect)
	}

	// githuboa_cb. Called by github after authorization is granted
	func handleGitHubCallback(w http.ResponseWriter, r *http.Request) {
	// If the user accepts your request, GitHub redirects back
	// to your site with a temporary code in a code parameter
	// as well as the state you provided in the previous step
	// in a state parameter. If the states don't match, the
	// request has been created by a third party and the process
	// should be aborted.
	state := r.FormValue("state")
	if state != oauthStateString {
	fmt.Printf("invalid oauth state, expected '%s', got '%s'\n", oauthStateString, state)
	http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
	return
	}

	code := r.FormValue("code")

	// On success, exchange this for an access token
	token, err := oauthConf.Exchange(oauth2.NoContext, code)
	if err != nil {
	fmt.Printf("oauthConf.Exchange() failed with '%s'\n", err)
	http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
	return
	}

	oauthClient := oauthConf.Client(oauth2.NoContext, token)

	// https://godoc.org/github.com/google/go-github/github
	client := github.NewClient(oauthClient)

	user, _, err := client.Users.Get("")
	if err != nil {
	fmt.Printf("client.Users.Get() failed with '%s'\n", err)
	http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
	return
	}

	buf := []string{"GitHub login id: ", user.Login, "\| GitHub email id: ", user.Email}

	userInfoTemplate.Execute(w, buf)
	}