add validations for app state

server/handlers/app.go

@@ -1,18 +1,55 @@
 package handlers
 
 import (
+	"encoding/base64"
+	"encoding/json"
 	"log"
 	"net/http"
 
+	"github.com/authorizerdev/authorizer/server/utils"
 	"github.com/gin-gonic/gin"
 )
 
-// TODO read query param = state which is base64 encoded
-// make sure url is present in allowed origins
-// set that in redirect_url
+type State struct {
+	AuthorizerURL string `json:"authorizerURL"`
+	RedirectURL   string `json:"redirectURL"`
+}
+
 func AppHandler() gin.HandlerFunc {
 	return func(c *gin.Context) {
-		log.Println("Host:", c.Request.Host)
+		host := c.Request.Host
+		state := c.Query("state")
+		if state == "" {
+			c.JSON(400, gin.H{"error": "invalid state"})
+			return
+		}
+
+		decodedState, err := base64.StdEncoding.DecodeString(state)
+		if err != nil {
+			c.JSON(400, gin.H{"error": "[unable to decode state] invalid state"})
+			return
+		}
+		var stateObj State
+		err = json.Unmarshal(decodedState, &stateObj)
+		if err != nil {
+			c.JSON(400, gin.H{"error": "[unable to parse state] invalid state"})
+			return
+		}
+
+		// validate redirect url with allowed origins
+		if !utils.IsValidRedirectURL(stateObj.RedirectURL) {
+			c.JSON(400, gin.H{"error": "invalid redirect url"})
+			return
+		}
+
+		log.Println(stateObj)
+		log.Println(host, utils.GetDomainName(stateObj.AuthorizerURL), utils.GetDomainName(host))
+		// validate host and domain of authorizer url
+		if utils.GetDomainName(stateObj.AuthorizerURL) != utils.GetDomainName(host) {
+			c.JSON(400, gin.H{"error": "invalid host url"})
+			return
+		}
+
 		// debug the request state
 		if pusher := c.Writer.Pusher(); pusher != nil {
 			// use pusher.Push() to do server push
@@ -22,8 +59,8 @@ func AppHandler() gin.HandlerFunc {
 		}
 		c.HTML(http.StatusOK, "app.tmpl", gin.H{
 			"data": map[string]string{
-				"authorizerURL": c.Request.Host,
-				"redirect_url":  "http://localhost:8080/app",
+				"authorizerURL": stateObj.AuthorizerURL,
+				"redirectURL":   stateObj.RedirectURL,
 			},
 		})
 	}

server/handlers/oauthCallback.go

@@ -174,11 +174,12 @@ func OAuthCallbackHandler() gin.HandlerFunc {
 		}
 
 		var err error
+		code := c.Request.FormValue("code")
 		switch provider {
 		case enum.Google.String():
-			err = processGoogleUserInfo(c.Request.FormValue("code"), c)
+			err = processGoogleUserInfo(code, c)
 		case enum.Github.String():
-			err = processGithubUserInfo(c.Request.FormValue("code"), c)
+			err = processGithubUserInfo(code, c)
 		default:
 			err = fmt.Errorf(`invalid oauth provider`)
 		}

server/handlers/oauthLogin.go

@@ -15,7 +15,7 @@ import (
 func OAuthLoginHandler() gin.HandlerFunc {
 	return func(c *gin.Context) {
 		// TODO validate redirect URL
-		redirectURL := c.Query("redirect_url")
+		redirectURL := c.Query("redirectURL")
 
 		if redirectURL == "" {
 			c.JSON(400, gin.H{

server/utils/cookie.go

@@ -12,7 +12,7 @@ func SetCookie(gc *gin.Context, token string) {
 	secure := true
 	httpOnly := true
 
-	host := GetDomainName(gc.Request.Host)
+	host := GetHostName(gc.Request.Host)
 	log.Println("=> host", host)
 	gc.SetSameSite(http.SameSiteNoneMode)
 	gc.SetCookie(constants.COOKIE_NAME, token, 3600, "/", host, secure, httpOnly)
@@ -35,7 +35,7 @@ func DeleteCookie(gc *gin.Context) {
 		secure = false
 	}
 
-	host := GetDomainName(gc.Request.Host)
+	host := GetHostName(gc.Request.Host)
 	gc.SetSameSite(http.SameSiteNoneMode)
 	gc.SetCookie(constants.COOKIE_NAME, "", -1, "/", host, secure, httpOnly)
 }

server/utils/urls.go

@@ -1,11 +1,13 @@
 package utils
 
 import (
+	"log"
 	"net/url"
+	"strings"
 )
 
 // function to get hostname
-func GetDomainName(auth_url string) string {
+func GetHostName(auth_url string) string {
 	u, err := url.Parse("//" + auth_url)
 	if err != nil {
 		return `localhost`
@@ -13,25 +15,38 @@ func GetDomainName(auth_url string) string {
 
 	host := u.Hostname()
 
+	return host
+}
+
+// function to get domain name
+func GetDomainName(auth_url string) string {
+	u, err := url.Parse("//" + auth_url)
+	if err != nil {
+		return `localhost`
+	}
+
+	host := u.Hostname()
+	log.Println("=> host", host)
+
 	// code to get root domain in case of sub-domains
-	// hostParts := strings.Split(host, ".")
-	// hostPartsLen := len(hostParts)
+	hostParts := strings.Split(host, ".")
+	hostPartsLen := len(hostParts)
 
-	// if hostPartsLen == 1 {
-	// 	return host
-	// }
+	if hostPartsLen == 1 {
+		return host
+	}
 
-	// if hostPartsLen == 2 {
-	// 	if hostParts[0] == "www" {
-	// 		return hostParts[1]
-	// 	} else {
-	// 		return host
-	// 	}
-	// }
+	if hostPartsLen == 2 {
+		if hostParts[0] == "www" {
+			return hostParts[1]
+		} else {
+			return host
+		}
+	}
 
-	// if hostPartsLen > 2 {
-	// 	return strings.Join(hostParts[hostPartsLen-2:], ".")
-	// }
+	if hostPartsLen > 2 {
+		return strings.Join(hostParts[hostPartsLen-2:], ".")
+	}
 
 	return host
 }

server/utils/validator.go

@@ -1,8 +1,31 @@
 package utils
 
-import "net/mail"
+import (
+	"net/mail"
+	"strings"
+
+	"github.com/authorizerdev/authorizer/server/constants"
+)
 
 func IsValidEmail(email string) bool {
 	_, err := mail.ParseAddress(email)
 	return err == nil
 }
+
+func IsValidRedirectURL(url string) bool {
+	if len(constants.ALLOWED_ORIGINS) == 1 && constants.ALLOWED_ORIGINS[0] == "*" {
+		return true
+	}
+
+	hasValidURL := false
+	urlDomain := GetDomainName(url)
+
+	for _, val := range constants.ALLOWED_ORIGINS {
+		if strings.Contains(val, urlDomain) {
+			hasValidURL = true
+			break
+		}
+	}
+
+	return hasValidURL
+}

templates/app.tmpl

@@ -6,12 +6,12 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Document</title>
     <link rel="stylesheet" href="/app/build/bundle.css">
+    <script>
+     window.__authorizer__ = {{.data}}
+    </script>
   </head>
   <body>
     <div id="root"></div>
     <script src="/app/build/bundle.js"></script>
-    <script>
-	window.__authorizer__ = {{.data}}
-    </script>
   </body>
 </html>