Add: facebook oauth2

auth/socialFacebook.go

@@ -0,0 +1,135 @@
+package auth
+
+import (
+	"encoding/json"
+	"errors"
+	"io/ioutil"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"golang.org/x/oauth2"
+)
+
+const SocialFacebook string = "socialFacebook"
+
+const FacebookProfileUrl string = "https://graph.facebook.com/v2.2/me?fields=id,name,email,picture,first_name,last_name"
+
+var passportOauth *oauth2.Config
+
+type FacebookProfile struct {
+	Id        string `json:"id"`
+	Email     string `json:"email"`
+	FirstName string `json:"first_name"`
+	LastName  string `json:"last_name"`
+	Hd        string `json:"hd"`
+	Locale    string `json:"locale"`
+	Name      string `json:"name"`
+	Picture   struct {
+		Data struct {
+			Url string `json:"url"`
+		} `json:"data"`
+	} `json:"picture"`
+}
+
+func ConfigFacebook(r *gin.RouterGroup, clientId string, secretKey string, redirectUrl string) {
+	facebookConfig := &oauth2.Config{
+		// ClientId: FBAppID(string), ClientSecret : FBSecret(string)
+		// Example - ClientId: "1234567890", ClientSecret: "red2drdff6e2321e51aedcc94e19c76ee"
+
+		ClientID:     clientId, // change this to yours
+		ClientSecret: secretKey,
+		RedirectURL:  redirectUrl, // change this to your webserver adddress
+		Scopes:       []string{"email", "user_birthday", "user_location", "user_about_me"},
+		Endpoint: oauth2.Endpoint{
+			AuthURL:  "https://www.facebook.com/dialog/oauth",
+			TokenURL: "https://graph.facebook.com/oauth/access_token",
+		},
+	}
+
+	passportOauth = facebookConfig
+
+	r.GET("/login", func(c *gin.Context) {
+		Login(facebookConfig, c)
+	})
+	r.GET("/callback", MiddlewareFacebook(), func(c *gin.Context) {
+		user, err := GetFacebookProfile(c)
+		if user == nil || err != nil {
+			c.AbortWithStatus(500)
+			return
+		}
+
+		c.JSON(http.StatusOK, *user)
+	})
+
+}
+
+func Routes(oauth *oauth2.Config, r *gin.RouterGroup) {
+	passportOauth = oauth
+
+	r.GET("/login", func(c *gin.Context) {
+		Login(oauth, c)
+	})
+}
+
+func Login(oauth *oauth2.Config, c *gin.Context) {
+	url := oauth.AuthCodeURL("")
+	c.Redirect(http.StatusFound, url)
+}
+
+func MiddlewareFacebook() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		getProfile(c)
+	}
+}
+
+func GetFacebookProfile(c *gin.Context) (*FacebookProfile, error) {
+	user, exists := c.Get(SocialFacebook)
+	if !exists {
+		return nil, errors.New("GinPassportFacebook namespace key doesn't exist")
+	}
+
+	return user.(*FacebookProfile), nil
+}
+
+func getProfile(c *gin.Context) {
+	c.Request.ParseForm()
+
+	config := passportOauth
+	code := c.Request.Form.Get("code")
+
+	t, err := config.Exchange(oauth2.NoContext, code)
+
+	if t == nil {
+		c.Redirect(301, "/")
+		return
+	} else if err != nil {
+		c.AbortWithError(http.StatusInternalServerError, err)
+		return
+	}
+
+	client := config.Client(oauth2.NoContext, t)
+
+	resp, err := client.Get(FacebookProfileUrl)
+	if err != nil {
+		c.AbortWithError(http.StatusInternalServerError, err)
+		return
+	}
+
+	defer resp.Body.Close()
+	contents, err := ioutil.ReadAll(resp.Body)
+
+	if err != nil {
+		c.AbortWithError(http.StatusInternalServerError, err)
+		return
+	}
+
+	var userInformation FacebookProfile
+	err = json.Unmarshal(contents, &userInformation)
+	if err != nil {
+		c.AbortWithError(http.StatusInternalServerError, err)
+		return
+	}
+
+	c.Set(SocialFacebook, &userInformation)
+	c.Next()
+}

config.json

@@ -4,5 +4,9 @@
 			{"Address":"[email protected]", "Password":"testing","Host":"mail.google.com","Port":465},
 			{"Address":"[email protected]", "Password":"testing","Host":"mail.google.com","Port":465}
 		],
-	"Jwtkey":"testing"
+	"Jwtkey":"testing",
+	"Facebook":{
+		"ClientID":"yourid",
+		"ClientSecret":"yoursecret"
+	}
 }

config/config.go

@@ -15,6 +15,8 @@ type Configuration struct{
 	MongoDBUrl 	string
 	Emails		[]Email
 	Jwtkey		string
+
+	Facebook 	FacebookClient
 }
 
 type Email struct{
@@ -24,6 +26,11 @@ type Email struct{
 	Port 		int
 }
 
+type FacebookClient struct{
+	ClientID 		string
+	ClientSecret 	string
+}
+
 
 
 func GetConfig(){
@@ -43,6 +50,7 @@ func GetConfig(){
 	// remove the two line below
 	fmt.Println("JWTKey: ",Config.Jwtkey)
 	fmt.Println("Emails: ",Config.Emails)
+	fmt.Println("Facebook:",Config.Facebook.ClientID)
 }
 
 func GetJwtKey() string{
@@ -59,4 +67,12 @@ func GetAnEmail() (Email,error) {
 
 func GetMongoDBUrl() string{
 	return Config.MongoDBUrl
+}
+
+func GetFacebookClientId() string{
+	return Config.Facebook.ClientID
+}
+
+func GetFacebookClientSecret() string {
+	return Config.Facebook.ClientSecret
 }

main.go

@@ -42,7 +42,8 @@ func main() {
 	r.POST("/login", auth.LoginUserWithEmail)
 	r.POST("/signup/email", auth.SignUpWithEmail)
 	r.POST("/signup/email/verify-email", auth.ActivateAccountAfterEmailSignup)
-
+	facebookR := r.Group("facebook")
+	auth.ConfigFacebook(facebookR, Config.GetFacebookClientId(), Config.GetFacebookClientSecret(), "http://localhost:8080/facebook/callback")
 
 	/*
 		api requiring authentication