Exchange token and fetch userinfo

server/auth.go

@@ -24,6 +24,7 @@ type UserAuth struct {
 type SessionData struct {
 	ID          string
 	DisplayName string
+	UserInfo    map[string]any
 }
 
 func (u UserAuth) IsGuest() bool {

server/login.go

@@ -1,6 +1,12 @@
 package server
 
 import (
+	"context"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/json"
 	"github.com/1f349/lavender/pages"
 	"github.com/google/uuid"
 	"github.com/julienschmidt/httprouter"
@@ -11,7 +17,12 @@ import (
 	"time"
 )
 
-func (h *HttpServer) loginGet(rw http.ResponseWriter, req *http.Request, _ httprouter.Params) {
+func (h *HttpServer) loginGet(rw http.ResponseWriter, req *http.Request, _ httprouter.Params, auth UserAuth) {
+	if !auth.IsGuest() {
+		h.SafeRedirect(rw, req)
+		return
+	}
+
 	cookie, err := req.Cookie("lavender-login-name")
 	if err == nil && cookie.Valid() == nil {
 		pages.RenderPageTemplate(rw, "login-memory", map[string]any{
@@ -27,7 +38,12 @@ func (h *HttpServer) loginGet(rw http.ResponseWriter, req *http.Request, _ httpr
 	})
 }
 
-func (h *HttpServer) loginPost(rw http.ResponseWriter, req *http.Request, _ httprouter.Params) {
+func (h *HttpServer) loginPost(rw http.ResponseWriter, req *http.Request, _ httprouter.Params, auth UserAuth) {
+	if !auth.IsGuest() {
+		h.SafeRedirect(rw, req)
+		return
+	}
+
 	if req.PostFormValue("not-you") == "1" {
 		http.SetCookie(rw, &http.Cookie{
 			Name:     "lavender-login-name",
@@ -77,3 +93,79 @@ func (h *HttpServer) loginPost(rw http.ResponseWriter, req *http.Request, _ http
 	nextUrl := oa2conf.AuthCodeURL(state, oauth2.SetAuthURLParam("login_name", loginUn))
 	http.Redirect(rw, req, nextUrl, http.StatusFound)
 }
+
+func (h *HttpServer) loginCallback(rw http.ResponseWriter, req *http.Request, _ httprouter.Params, auth UserAuth) {
+	flowState, ok := h.flowState.Get(req.FormValue("state"))
+	if !ok {
+		http.Error(rw, "Invalid flow state", http.StatusBadRequest)
+		return
+	}
+	token, err := flowState.sso.OAuth2Config.Exchange(context.Background(), req.FormValue("code"), oauth2.SetAuthURLParam("redirect_uri", h.conf.BaseUrl+"/callback"))
+	if err != nil {
+		http.Error(rw, "Failed to exchange code for token", http.StatusInternalServerError)
+		return
+	}
+
+	res, err := flowState.sso.OAuth2Config.Client(context.Background(), token).Get(flowState.sso.UserInfoEndpoint)
+	if err != nil || res.StatusCode != 200 {
+		rw.WriteHeader(http.StatusInternalServerError)
+		if err != nil {
+			_, _ = rw.Write([]byte(err.Error()))
+		} else {
+			_, _ = rw.Write([]byte(res.Status))
+		}
+		return
+	}
+	defer res.Body.Close()
+
+	var userInfoJson map[string]any
+	if err := json.NewDecoder(res.Body).Decode(&userInfoJson); err != nil {
+		http.Error(rw, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	subject, ok := userInfoJson["sub"].(string)
+	if !ok {
+		http.Error(rw, "Invalid subject", http.StatusInternalServerError)
+		return
+	}
+	subject += "@" + flowState.sso.Config.Namespace
+
+	displayName, ok := userInfoJson["name"].(string)
+	if !ok {
+		displayName = "Unknown Name"
+	}
+
+	// only continues if the above tx succeeds
+	auth.Data = SessionData{
+		ID:          subject,
+		DisplayName: displayName,
+		UserInfo:    userInfoJson,
+	}
+	if auth.SaveSessionData() != nil {
+		http.Error(rw, "Failed to save session", http.StatusInternalServerError)
+		return
+	}
+
+	if h.setLoginDataCookie(rw, auth.Data.ID) {
+		http.Error(rw, "Internal Server Error", http.StatusInternalServerError)
+		return
+	}
+	h.SafeRedirect(rw, req)
+}
+
+func (h *HttpServer) setLoginDataCookie(rw http.ResponseWriter, userId string) bool {
+	encryptedData, err := rsa.EncryptOAEP(sha256.New(), rand.Reader, h.signingKey.PublicKey(), []byte(userId), []byte("login-data"))
+	if err != nil {
+		return true
+	}
+	encryptedString := base64.RawStdEncoding.EncodeToString(encryptedData)
+	http.SetCookie(rw, &http.Cookie{
+		Name:     "login-data",
+		Value:    encryptedString,
+		Path:     "/",
+		Expires:  time.Now().AddDate(0, 3, 0),
+		Secure:   true,
+		SameSite: http.SameSiteStrictMode,
+	})
+	return false
+}

server/server.go

@@ -18,6 +18,7 @@ import (
 	"github.com/go-oauth2/oauth2/v4/manage"
 	"github.com/go-oauth2/oauth2/v4/server"
 	"github.com/go-oauth2/oauth2/v4/store"
+	"github.com/go-session/session"
 	"github.com/julienschmidt/httprouter"
 	"log"
 	"net/http"
@@ -44,6 +45,8 @@ type flowStateData struct {
 }
 
 func NewHttpServer(conf Conf, db *database.DB, signingKey mjwt.Signer) *http.Server {
+	session.InitManager(session.SetCookieName("lavender_session"))
+
 	r := httprouter.New()
 
 	// remove last slash from baseUrl
@@ -117,8 +120,9 @@ func NewHttpServer(conf Conf, db *database.DB, signingKey mjwt.Signer) *http.Ser
 	r.GET("/", hs.OptionalAuthentication(hs.Home))
 
 	// login
-	r.GET("/login", hs.loginGet)
+	r.GET("/login", hs.OptionalAuthentication(hs.loginGet))
-	r.POST("/login", hs.loginPost)
+	r.POST("/login", hs.OptionalAuthentication(hs.loginPost))
+	r.GET("/callback", hs.OptionalAuthentication(hs.loginCallback))
 	r.POST("/logout", hs.RequireAuthentication(func(rw http.ResponseWriter, req *http.Request, params httprouter.Params, auth UserAuth) {
 		lNonce, ok := auth.Session.Get("action-nonce")
 		if !ok {

test-client/index.html

@@ -2,11 +2,13 @@
 <html lang="en">
 <head>
     <title>Test Client</title>
+    <script src="popup.js"></script>
     <script>
-      let currentLoginPopup = null;
         let currentTokens = null;
         const ssoService = "http://localhost:9090";
 
+        POP2.init(ssoService + "/authorize", "a", "openid profile", 500, 600);
+
         function updateTokenInfo(data) {
             currentTokens = data.tokens;
             data.tokens = {
@@ -30,17 +32,6 @@
             }
         }
 
-      window.addEventListener("message", function (event) {
-          if (event.origin !== ssoService) return;
-          if (isObject(event.data)) {
-              updateTokenInfo(event.data);
-
-              if (currentLoginPopup) currentLoginPopup.close();
-              return;
-          }
-          alert("Failed to log user in: the login data was probably corrupted");
-      });
-
         function parseJwt(token) {
             const base64Url = token.split('.')[1];
             const base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/');
@@ -50,59 +41,19 @@
             return JSON.parse(jsonPayload);
         }
 
-      function isObject(obj) {
-          return obj != null && obj.constructor.name === "Object"
-      }
-
-      function popupCenterScreen(url, title, w, h, focus) {
-          const top = (screen.availHeight - h) / 4, left = (screen.availWidth - w) / 2;
-          const popup = openWindow(url, title, `scrollbars=yes,width=${w},height=${h},top=${top},left=${left}`);
-          if (focus === true && window.focus) popup.focus();
-          return popup;
-      }
-
-      function openWindow(url, winnm, options) {
-          var wTop = firstAvailableValue([window.screen.availTop, window.screenY, window.screenTop, 0]);
-          var wLeft = firstAvailableValue([window.screen.availLeft, window.screenX, window.screenLeft, 0]);
-          var top = 0, left = 0;
-          var result;
-          if ((result = /top=(\d+)/g.exec(options))) top = parseInt(result[1]);
-          if ((result = /left=(\d+)/g.exec(options))) left = parseInt(result[1]);
-          if (options) {
-              options = options.replace("top=" + top, "top=" + (parseInt(top) + wTop));
-              options = options.replace("left=" + left, "left=" + (parseInt(left) + wLeft));
-              w = window.open(url, winnm, options);
-          } else w = window.open(url, winnm);
-          return w;
-      }
-
-      function firstAvailableValue(arr) {
-          for (var i = 0; i < arr.length; i++)
-              if (typeof arr[i] != 'undefined')
-                  return arr[i];
-      }
-
         function doThisThing() {
-          if (currentLoginPopup) currentLoginPopup.close();
+            POP2.getToken(function (token) {
-          currentLoginPopup = popupCenterScreen(ssoService + '/popup?origin=' + encodeURIComponent(location.origin), 'Login with Lavender', 500, 500, false);
+                console.log(token);
+            });
         }
 
-      async function refreshAllTokens() {
+
-          let req = await fetch(ssoService + '/refresh', {
-              method: 'POST',
-              mode: 'cors',
-              cache: 'no-cache',
-              credentials: 'include',
-              headers: {
-                  "Content-Type": "application/json",
-              },
-              body: JSON.stringify({"token": currentTokens.refresh}),
-          });
-          let reqJson = await req.json();
-          updateTokenInfo(reqJson);
-      }
     </script>
     <style>
+        :root {
+            color-scheme: light dark;
+        }
+
         #someTextArea {
             width: 400px;
             height: 400px;
@@ -121,7 +72,6 @@
 <main>
     <div>
         <button onclick="doThisThing();">Login</button>
-    <button onclick="refreshAllTokens();">Refresh</button>
     </div>
     <div style="display:flex; gap: 2em;">
         <div>

test-client/popup.js

@@ -0,0 +1,134 @@
+/* Simple OAuth 2.0 Client flow library
+
+  Author: MrMelon54, timdream
+
+  Usage:
+  POP2.init(client_id, scope)
+  	Initialize the library.
+    redirect_uri is the current page (window.location.href).
+    This function should be put before Analytics so that the second click won't result a page view register.
+  POP2.getToken(callback)
+    Send access token to the callback function as the first argument.
+    If not logged in this triggers login popup and execute login after logged in.
+    Be sure to call this function in user-triggered event (such as click) to prevent popup blocker.
+    If not sure do use isLoggedIn() below to check first.
+  POP2.isLoggedIn()
+    boolean
+
+*/
+
+"use strict";
+
+(function (w) {
+    const windowName = 'pop2_oauth2_login_popup';
+
+    if (window.name === windowName) {
+        if (
+            window.opener &&
+            window.opener.POP2
+        ) {
+            if (window.location.hash.indexOf('access_token') !== -1) {
+                window.opener.POP2.receiveToken(
+                    window.location.hash.replace(/^.*access_token=([^&]+).*$/, '$1'),
+                    parseInt(window.location.hash.replace(/^.*expires_in=([^&]+).*$/, '$1'))
+                );
+            }
+            if (window.location.search.indexOf('error=')) {
+                window.opener.POP2.receiveToken('ERROR');
+            }
+        }
+        window.close();
+    }
+
+    function popupCenterScreen(url, title, w, h) {
+        const top = (screen.availHeight - h) / 4, left = (screen.availWidth - w) / 2;
+        return openWindow(url, title, `scrollbars=yes,width=${w},height=${h},top=${top},left=${left}`);
+    }
+
+    function openWindow(url, winnm, options) {
+        const wTop = firstAvailableValue([window.screen.availTop, window.screenY, window.screenTop, 0]);
+        const wLeft = firstAvailableValue([window.screen.availLeft, window.screenX, window.screenLeft, 0]);
+        let top = "0",
+            left = "0",
+            result;
+        if ((result = /top=(\d+)/g.exec(options))) top = parseInt(result[1]);
+        if ((result = /left=(\d+)/g.exec(options))) left = parseInt(result[1]);
+        if (options) {
+            options = options.replace("top=" + top, "top=" + (parseInt(top) + wTop));
+            options = options.replace("left=" + left, "left=" + (parseInt(left) + wLeft));
+            w = window.open(url, winnm, options);
+        } else w = window.open(url, winnm);
+        return w;
+    }
+
+    function firstAvailableValue(arr) {
+        for (let i = 0; i < arr.length; i++)
+            if (typeof arr[i] != 'undefined')
+                return arr[i];
+    }
+
+    let client_endpoint,
+        client_id,
+        scope = '',
+        redirect_uri = window.location.href.substr(0, window.location.href.length - window.location.hash.length).replace(/#$/, ''),
+        access_token,
+        callbackWaitForToken,
+        w_width = 400,
+        w_height = 360;
+
+    w.POP2 = {
+        // init
+        init: function (f_client_endpoint, f_client_id, f_scope, width, height) {
+            if (!f_client_endpoint) return false;
+            if (!f_client_id) return false;
+            client_endpoint = f_client_endpoint;
+            client_id = f_client_id;
+            if (f_scope) scope = f_scope;
+            if (width) w_width = width;
+            if (height) w_height = height;
+        },
+        // receive token from popup
+        receiveToken: function (token, expires_in) {
+            if (token !== 'ERROR') {
+                access_token = token;
+                if (callbackWaitForToken) callbackWaitForToken(access_token);
+                setTimeout(
+                    function () {
+                        access_token = undefined;
+                    },
+                    expires_in * 1000
+                );
+            } else if (token === false) {
+                callbackWaitForToken = undefined;
+            }
+        },
+        // boolean, indicate logged in or not
+        isLoggedIn: function () {
+            return !!access_token;
+        },
+        // pass the access token to callback
+        // if not logged in this triggers login popup;
+        // use isLoggedIn to check login first to prevent popup blocker
+        getToken: function (callback) {
+            if (!client_id || !redirect_uri || !scope) {
+                alert('You need init() first. Check the program flow.');
+                return false;
+            }
+            if (!access_token) {
+                callbackWaitForToken = callback;
+                popupCenterScreen(
+                    client_endpoint
+                    + '?response_type=token'
+                    + '&redirect_uri=' + encodeURIComponent(redirect_uri)
+                    + '&scope=' + encodeURIComponent(scope)
+                    + '&client_id=' + encodeURIComponent(client_id),
+                    windowName,
+                    w_width,
+                    w_height
+                );
+            } else {
+                return callback(access_token);
+            }
+        }
+    };
+})(this);