Get OAuth2 token, call API

bouquins/bouquins.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"html/template"
+	"io/ioutil"
 	"log"
 	"net/http"
 	"net/url"
@@ -38,6 +39,8 @@ const (
 	URLIndex = "/"
 	// URLLogin url of login page (OAuth 2)
 	URLLogin = "/login"
+	// URLCallback url of OAuth callback
+	URLCallback = "/callback"
 	// URLBooks url of books page
 	URLBooks = "/books/"
 	// URLAuthors url of authors page
@@ -429,11 +432,37 @@ func (app *Bouquins) AboutPage(res http.ResponseWriter, req *http.Request) error
 
 // LoginPage redirects to OAuth login page (github)
 func (app *Bouquins) LoginPage(res http.ResponseWriter, req *http.Request) error {
-	url := app.OAuthConf.AuthCodeURL("state", oauth2.AccessTypeOffline)
+	url := app.OAuthConf.AuthCodeURL("state") // FIXME random state
 	http.Redirect(res, req, url, http.StatusTemporaryRedirect)
 	return nil
 }
 
+// CallbackPage handle OAuth 2 callback
+func (app *Bouquins) CallbackPage(res http.ResponseWriter, req *http.Request) error {
+	state := req.FormValue("state")
+	if state != "state" { // FIXME random state
+		fmt.Printf("invalid oauth state, expected '%s', got '%s'\n", "state", state)
+		http.Redirect(res, req, "/", http.StatusTemporaryRedirect)
+		return nil
+	}
+
+	code := req.FormValue("code")
+	token, err := app.OAuthConf.Exchange(oauth2.NoContext, code)
+	if err != nil {
+		fmt.Println("Code exchange failed with '%s'\n", err)
+		http.Redirect(res, req, "/", http.StatusTemporaryRedirect)
+		return nil
+	}
+
+	response, err := http.Get("https://api.github.com/user?access_token=" + token.AccessToken)
+
+	defer response.Body.Close()
+	contents, err := ioutil.ReadAll(response.Body)
+	fmt.Fprintf(res, "Content: %s\n", contents)
+	// TODO
+	return nil
+}
+
 // IndexPage displays index page: list of books/authors/series
 func (app *Bouquins) IndexPage(res http.ResponseWriter, req *http.Request) error {
 	count, err := app.BookCount()

main.go

@@ -110,6 +110,7 @@ func handleURL(url string, f func(res http.ResponseWriter, req *http.Request) er
 func router(app *bouquins.Bouquins) {
 	handleURL(bouquins.URLIndex, app.IndexPage)
 	handleURL(bouquins.URLLogin, app.LoginPage)
+	handleURL(bouquins.URLCallback, app.CallbackPage)
 	handleURL(bouquins.URLBooks, app.BooksPage)
 	handleURL(bouquins.URLAuthors, app.AuthorsPage)
 	handleURL(bouquins.URLSeries, app.SeriesPage)