Implemented oauth attach functionality, oauth detach functionality, and required data migration. T713

account.go

@@ -1038,18 +1038,30 @@ func viewSettings(app *App, u *User, w http.ResponseWriter, r *http.Request) err
 
 	flashes, _ := getSessionFlashes(app, w, r, nil)
 
+	oauthAccounts, err := app.db.GetOauthAccounts(r.Context(), u.ID)
+	if err != nil {
+		log.Error("Unable to get oauth accounts for settings: %s", err)
+		return impart.HTTPError{http.StatusInternalServerError, "Unable to retrieve user data. The humans have been alerted."}
+	}
+
 	obj := struct {
 		*UserPage
-		Email     string
-		HasPass   bool
-		IsLogOut  bool
-		Suspended bool
+		Email         string
+		HasPass       bool
+		IsLogOut      bool
+		Suspended     bool
+		OauthAccounts []oauthAccountInfo
+		OauthSlack    bool
+		OauthWriteAs  bool
 	}{
-		UserPage:  NewUserPage(app, r, u, "Account Settings", flashes),
-		Email:     fullUser.EmailClear(app.keys),
-		HasPass:   passIsSet,
-		IsLogOut:  r.FormValue("logout") == "1",
-		Suspended: fullUser.IsSilenced(),
+		UserPage:      NewUserPage(app, r, u, "Account Settings", flashes),
+		Email:         fullUser.EmailClear(app.keys),
+		HasPass:       passIsSet,
+		IsLogOut:      r.FormValue("logout") == "1",
+		Suspended:     fullUser.IsSilenced(),
+		OauthAccounts: oauthAccounts,
+		OauthSlack:    app.Config().SlackOauth.ClientID != "",
+		OauthWriteAs:  app.Config().WriteAsOauth.ClientID != "",
 	}
 
 	showUserPage(w, "settings", obj)
@@ -1094,6 +1106,19 @@ func getTempInfo(app *App, key string, r *http.Request, w http.ResponseWriter) s
 	return s
 }
 
+func removeOauth(app *App, u *User, w http.ResponseWriter, r *http.Request) error {
+	provider := r.FormValue("provider")
+	clientID := r.FormValue("client_id")
+	remoteUserID := r.FormValue("remote_user_id")
+
+	err := app.db.RemoveOauth(r.Context(), u.ID, provider, clientID, remoteUserID)
+	if err != nil {
+		return impart.HTTPError{Status: http.StatusInternalServerError, Message: err.Error()}
+	}
+
+	return impart.HTTPError{Status: http.StatusFound, Message: "/me/settings"}
+}
+
 func prepareUserEmail(input string, emailKey []byte) zero.String {
 	email := zero.NewString("", input != "")
 	if len(input) > 0 {

database.go

@@ -128,8 +128,10 @@ type writestore interface {
 
 	GetIDForRemoteUser(context.Context, string, string, string) (int64, error)
 	RecordRemoteUserID(context.Context, int64, string, string, string, string) error
-	ValidateOAuthState(context.Context, string) (string, string, error)
-	GenerateOAuthState(context.Context, string, string) (string, error)
+	ValidateOAuthState(context.Context, string) (string, string, int64, error)
+	GenerateOAuthState(context.Context, string, string, int64) (string, error)
+	GetOauthAccounts(ctx context.Context, userID int64) ([]oauthAccountInfo, error)
+	RemoveOauth(ctx context.Context, userID int64, provider string, clientID string, remoteUserID string) error
 
 	DatabaseInitialized() bool
 }
@@ -2462,20 +2464,23 @@ func (db *datastore) GetCollectionLastPostTime(id int64) (*time.Time, error) {
 	return &t, nil
 }
 
-func (db *datastore) GenerateOAuthState(ctx context.Context, provider, clientID string) (string, error) {
+func (db *datastore) GenerateOAuthState(ctx context.Context, provider string, clientID string, attachUser int64) (string, error) {
 	state := store.Generate62RandomString(24)
-	_, err := db.ExecContext(ctx, "INSERT INTO oauth_client_states (state, provider, client_id, used, created_at) VALUES (?, ?, ?, FALSE, NOW())", state, provider, clientID)
+	_, err := db.ExecContext(ctx, "INSERT INTO oauth_client_states (state, provider, client_id, used, created_at, attach_user_id) VALUES (?, ?, ?, FALSE, NOW(), ?)", state, provider, clientID, attachUser)
 	if err != nil {
 		return "", fmt.Errorf("unable to record oauth client state: %w", err)
 	}
 	return state, nil
 }
 
-func (db *datastore) ValidateOAuthState(ctx context.Context, state string) (string, string, error) {
+func (db *datastore) ValidateOAuthState(ctx context.Context, state string) (string, string, int64, error) {
 	var provider string
 	var clientID string
+	var attachUserID int64
 	err := wf_db.RunTransactionWithOptions(ctx, db.DB, &sql.TxOptions{}, func(ctx context.Context, tx *sql.Tx) error {
-		err := tx.QueryRow("SELECT provider, client_id FROM oauth_client_states WHERE state = ? AND used = FALSE", state).Scan(&provider, &clientID)
+		err := tx.
+			QueryRowContext(ctx, "SELECT provider, client_id, attach_user_id FROM oauth_client_states WHERE state = ? AND used = FALSE", state).
+			Scan(&provider, &clientID, &attachUserID)
 		if err != nil {
 			return err
 		}
@@ -2494,9 +2499,9 @@ func (db *datastore) ValidateOAuthState(ctx context.Context, state string) (stri
 		return nil
 	})
 	if err != nil {
-		return "", "", nil
+		return "", "", 0, nil
 	}
-	return provider, clientID, nil
+	return provider, clientID, attachUserID, nil
 }
 
 func (db *datastore) RecordRemoteUserID(ctx context.Context, localUserID int64, remoteUserID, provider, clientID, accessToken string) error {
@@ -2525,6 +2530,33 @@ func (db *datastore) GetIDForRemoteUser(ctx context.Context, remoteUserID, provi
 	return userID, nil
 }
 
+type oauthAccountInfo struct {
+	Provider     string
+	ClientID     string
+	RemoteUserID string
+}
+
+func (db *datastore) GetOauthAccounts(ctx context.Context, userID int64) ([]oauthAccountInfo, error) {
+	rows, err := db.QueryContext(ctx, "SELECT provider, client_id, remote_user_id FROM oauth_users WHERE user_id = ? ", userID)
+	if err != nil {
+		log.Error("Failed selecting from oauth_users: %v", err)
+		return nil, impart.HTTPError{http.StatusInternalServerError, "Couldn't retrieve user oauth accounts."}
+	}
+	defer rows.Close()
+
+	var records []oauthAccountInfo
+	for rows.Next() {
+		info := oauthAccountInfo{}
+		err = rows.Scan(&info.Provider, &info.ClientID, &info.RemoteUserID)
+		if err != nil {
+			log.Error("Failed scanning GetAllUsers() row: %v", err)
+			break
+		}
+		records = append(records, info)
+	}
+	return records, nil
+}
+
 // DatabaseInitialized returns whether or not the current datastore has been
 // initialized with the correct schema.
 // Currently, it checks to see if the `users` table exists.
@@ -2547,6 +2579,11 @@ func (db *datastore) DatabaseInitialized() bool {
 	return true
 }
 
+func (db *datastore) RemoveOauth(ctx context.Context, userID int64, provider string, clientID string, remoteUserID string) error {
+	_, err := db.ExecContext(ctx, `DELETE FROM oauth_users WHERE user_id = ? AND provider = ? AND client_id = ? AND remote_user_id = ?`, userID, provider, clientID, remoteUserID)
+	return err
+}
+
 func stringLogln(log *string, s string, v ...interface{}) {
 	*log += fmt.Sprintf(s+"\n", v...)
 }

database_test.go

@@ -18,13 +18,13 @@ func TestOAuthDatastore(t *testing.T) {
 			driverName: "",
 		}
 
-		state, err := ds.GenerateOAuthState(ctx, "test", "development")
+		state, err := ds.GenerateOAuthState(ctx, "test", "development", 0)
 		assert.NoError(t, err)
 		assert.Len(t, state, 24)
 
 		countRows(t, ctx, db, 1, "SELECT COUNT(*) FROM `oauth_client_states` WHERE `state` = ? AND `used` = false", state)
 
-		_, _, err = ds.ValidateOAuthState(ctx, state)
+		_, _, _, err = ds.ValidateOAuthState(ctx, state)
 		assert.NoError(t, err)
 
 		countRows(t, ctx, db, 1, "SELECT COUNT(*) FROM `oauth_client_states` WHERE `state` = ? AND `used` = true", state)

migrations/migrations.go

@@ -61,6 +61,7 @@ var migrations = []Migration{
 	New("support users suspension", supportUserStatus),          // V2 -> V3 (v0.11.0)
 	New("support oauth", oauth),                                 // V3 -> V4
 	New("support slack oauth", oauthSlack),                      // V4 -> v5
+	New("support oauth attach", oauthAttach),                    // V5 -> V6
 }
 
 // CurrentVer returns the current migration version the application is on

migrations/v6.go

@@ -0,0 +1,36 @@
+package migrations
+
+import (
+	"context"
+	"database/sql"
+
+	wf_db "github.com/writeas/writefreely/db"
+)
+
+func oauthAttach(db *datastore) error {
+	dialect := wf_db.DialectMySQL
+	if db.driverName == driverSQLite {
+		dialect = wf_db.DialectSQLite
+	}
+	return wf_db.RunTransactionWithOptions(context.Background(), db.DB, &sql.TxOptions{}, func(ctx context.Context, tx *sql.Tx) error {
+		builders := []wf_db.SQLBuilder{
+			dialect.
+				AlterTable("oauth_client_states").
+				AddColumn(dialect.
+					Column(
+						"attach_user_id",
+						wf_db.ColumnTypeInteger,
+						wf_db.OptionalInt{Set: true, Value: 24,}).SetNullable(false).SetDefault("0")),
+		}
+		for _, builder := range builders {
+			query, err := builder.ToSQL()
+			if err != nil {
+				return err
+			}
+			if _, err := tx.ExecContext(ctx, query); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+}

oauth.go

@@ -59,8 +59,8 @@ type OAuthDatastoreProvider interface {
 type OAuthDatastore interface {
 	GetIDForRemoteUser(context.Context, string, string, string) (int64, error)
 	RecordRemoteUserID(context.Context, int64, string, string, string, string) error
-	ValidateOAuthState(context.Context, string) (string, string, error)
-	GenerateOAuthState(context.Context, string, string) (string, error)
+	ValidateOAuthState(context.Context, string) (string, string, int64, error)
+	GenerateOAuthState(context.Context, string, string, int64) (string, error)
 
 	CreateUser(*config.Config, *User, string) error
 	GetUserByID(int64) (*User, error)
@@ -96,19 +96,32 @@ type oauthHandler struct {
 
 func (h oauthHandler) viewOauthInit(app *App, w http.ResponseWriter, r *http.Request) error {
 	ctx := r.Context()
-	state, err := h.DB.GenerateOAuthState(ctx, h.oauthClient.GetProvider(), h.oauthClient.GetClientID())
+
+	var attachUser int64
+	if attach := r.URL.Query().Get("attach"); attach == "t" {
+		user, _ := getUserAndSession(app, r)
+		if user == nil {
+			return impart.HTTPError{http.StatusInternalServerError, "cannot attach auth to user: user not found in session"}
+		}
+		attachUser = user.ID
+	}
+
+	state, err := h.DB.GenerateOAuthState(ctx, h.oauthClient.GetProvider(), h.oauthClient.GetClientID(), attachUser)
 	if err != nil {
+		log.Error("viewOauthInit error: %s", err)
 		return impart.HTTPError{http.StatusInternalServerError, "could not prepare oauth redirect url"}
 	}
 
 	if h.callbackProxy != nil {
 		if err := h.callbackProxy.register(ctx, state); err != nil {
+			log.Error("viewOauthInit error: %s", err)
 			return impart.HTTPError{http.StatusInternalServerError, "could not register state server"}
 		}
 	}
 
 	location, err := h.oauthClient.buildLoginURL(state)
 	if err != nil {
+		log.Error("viewOauthInit error: %s", err)
 		return impart.HTTPError{http.StatusInternalServerError, "could not prepare oauth redirect url"}
 	}
 	return impart.HTTPError{http.StatusTemporaryRedirect, location}
@@ -185,7 +198,7 @@ func (h oauthHandler) viewOauthCallback(app *App, w http.ResponseWriter, r *http
 	code := r.FormValue("code")
 	state := r.FormValue("state")
 
-	provider, clientID, err := h.DB.ValidateOAuthState(ctx, state)
+	provider, clientID, attachUserID, err := h.DB.ValidateOAuthState(ctx, state)
 	if err != nil {
 		log.Error("Unable to ValidateOAuthState: %s", err)
 		return impart.HTTPError{http.StatusInternalServerError, err.Error()}
@@ -223,6 +236,14 @@ func (h oauthHandler) viewOauthCallback(app *App, w http.ResponseWriter, r *http
 		}
 		return nil
 	}
+	if attachUserID > 0 {
+		log.Info("attaching to user %d", attachUserID)
+		err = h.DB.RecordRemoteUserID(r.Context(), attachUserID, tokenInfo.UserID, provider, clientID, tokenResponse.AccessToken)
+		if err != nil {
+			return impart.HTTPError{http.StatusInternalServerError, err.Error()}
+		}
+		return impart.HTTPError{http.StatusFound, "/me/settings"}
+	}
 
 	displayName := tokenInfo.DisplayName
 	if len(displayName) == 0 {

oauth_test.go

@@ -22,8 +22,8 @@ type MockOAuthDatastoreProvider struct {
 }
 
 type MockOAuthDatastore struct {
-	DoGenerateOAuthState func(context.Context, string, string) (string, error)
-	DoValidateOAuthState func(context.Context, string) (string, string, error)
+	DoGenerateOAuthState func(context.Context, string, string, int64) (string, error)
+	DoValidateOAuthState func(context.Context, string) (string, string, int64, error)
 	DoGetIDForRemoteUser func(context.Context, string, string, string) (int64, error)
 	DoCreateUser         func(*config.Config, *User, string) error
 	DoRecordRemoteUserID func(context.Context, int64, string, string, string, string) error
@@ -86,11 +86,11 @@ func (m *MockOAuthDatastoreProvider) Config() *config.Config {
 	return cfg
 }
 
-func (m *MockOAuthDatastore) ValidateOAuthState(ctx context.Context, state string) (string, string, error) {
+func (m *MockOAuthDatastore) ValidateOAuthState(ctx context.Context, state string) (string, string, int64, error) {
 	if m.DoValidateOAuthState != nil {
 		return m.DoValidateOAuthState(ctx, state)
 	}
-	return "", "", nil
+	return "", "", 0, nil
 }
 
 func (m *MockOAuthDatastore) GetIDForRemoteUser(ctx context.Context, remoteUserID, provider, clientID string) (int64, error) {
@@ -125,9 +125,9 @@ func (m *MockOAuthDatastore) GetUserByID(userID int64) (*User, error) {
 	return user, nil
 }
 
-func (m *MockOAuthDatastore) GenerateOAuthState(ctx context.Context, provider string, clientID string) (string, error) {
+func (m *MockOAuthDatastore) GenerateOAuthState(ctx context.Context, provider string, clientID string, attachUserID int64) (string, error) {
 	if m.DoGenerateOAuthState != nil {
-		return m.DoGenerateOAuthState(ctx, provider, clientID)
+		return m.DoGenerateOAuthState(ctx, provider, clientID, attachUserID)
 	}
 	return store.Generate62RandomString(14), nil
 }
@@ -173,7 +173,7 @@ func TestViewOauthInit(t *testing.T) {
 		app := &MockOAuthDatastoreProvider{
 			DoDB: func() OAuthDatastore {
 				return &MockOAuthDatastore{
-					DoGenerateOAuthState: func(ctx context.Context, provider, clientID string) (string, error) {
+					DoGenerateOAuthState: func(ctx context.Context, provider, clientID string, attachUserID int64) (string, error) {
 						return "", fmt.Errorf("pretend unable to write state error")
 					},
 				}

routes.go

@@ -101,6 +101,7 @@ func InitRoutes(apper Apper, r *mux.Router) *mux.Router {
 	me.HandleFunc("/settings", handler.User(viewSettings)).Methods("GET")
 	me.HandleFunc("/invites", handler.User(handleViewUserInvites)).Methods("GET")
 	me.HandleFunc("/logout", handler.Web(viewLogout, UserLevelNone)).Methods("GET")
+	me.HandleFunc("/oauth/remove", handler.User(removeOauth)).Methods("POST")
 
 	write.HandleFunc("/api/me", handler.All(viewMeAPI)).Methods("GET")
 	apiMe := write.PathPrefix("/api/me/").Subrouter()

templates/user/settings.tmpl

@@ -66,6 +66,28 @@ h3 { font-weight: normal; }
 			<input type="submit" value="Save changes" tabindex="4" />
 		</div>
 	</form>
+
+	{{ if .OauthAccounts }}
+	    {{ range $oauth_account := .OauthAccounts }}
+		    <form method="post" action="/me/oauth/remove" autocomplete="false">
+		        <input type="hidden" name="provider" value="{{ $oauth_account.Provider }}" />
+		        <input type="hidden" name="client_id" value="{{ $oauth_account.ClientID }}" />
+		        <input type="hidden" name="remote_user_id" value="{{ $oauth_account.RemoteUserID }}" />
+    		    <div class="option">
+    			    <h3>{{ $oauth_account.Provider }} </h3>
+    			    <div class="section">
+    				    <input type="submit" value="Remove" style="margin-left: 1em;" />
+    			    </div>
+    		    </div>
+    	    </form>
+        {{ end }}
+	{{ end }}
+	{{ if .OauthSlack }}
+    	<a class="loginbtn" href="/oauth/slack?attach=t"><img alt="Sign in with Slack" height="40" width="172" src="/img/sign_in_with_slack.png" srcset="/img/sign_in_with_slack.png 1x, /img/sign_in_with_slack@2x.png 2x" /></a>
+    {{ end }}
+    {{ if .OauthWriteAs }}
+        <a class="btn cta loginbtn" id="writeas-login" href="/oauth/write.as?attach=t">Link your <strong>Write.as</strong> account.</a>
+    {{ end }}
 </div>
 
 <script>