Add OAuth integration for multiple providers and implement user linking

- Created OAuth credentials setup guide for Google, Microsoft, Keycloak, ORY, and ZITADEL.
- Added migration for oauth_identity table to store OAuth identities linked to users.
- Implemented OAuthIdentity model for managing OAuth identities in the database.
- Developed oauthService to handle OAuth login, user creation, and identity linking.
- Created OAuthCallbackView and OAuthUserCallbackView components for handling OAuth responses in the frontend.
- Added error handling and user feedback during the OAuth process.

backend/models/associations.js

@@ -6,6 +6,7 @@ import Room from './chat/room.js';
 import User from './community/user.js';
 import UserParam from './community/user_param.js';
 import UserDashboard from './community/user_dashboard.js';
+import OAuthIdentity from './community/oauth_identity.js';
 import UserParamType from './type/user_param.js';
 import UserRightType from './type/user_right.js';
 import UserRight from './community/user_right.js';
@@ -182,6 +183,9 @@ export default function setupAssociations() {
   User.hasOne(UserDashboard, { foreignKey: 'userId', as: 'dashboard' });
   UserDashboard.belongsTo(User, { foreignKey: 'userId', as: 'user' });
 
+  User.hasMany(OAuthIdentity, { foreignKey: 'userId', as: 'oauthIdentities' });
+  OAuthIdentity.belongsTo(User, { foreignKey: 'userId', as: 'user' });
+
   UserParamValue.belongsTo(UserParamType, { foreignKey: 'userParamTypeId', as: 'user_param_value_type' });
   UserParamType.hasMany(UserParamValue, { foreignKey: 'userParamTypeId', as: 'user_param_type_value' });
 

backend/models/community/oauth_identity.js

@@ -0,0 +1,54 @@
+import { sequelize } from '../../utils/sequelize.js';
+import { DataTypes } from 'sequelize';
+
+const OAuthIdentity = sequelize.define('oauth_identity', {
+    userId: {
+        type: DataTypes.INTEGER,
+        allowNull: false,
+        field: 'user_id'
+    },
+    provider: {
+        type: DataTypes.STRING(64),
+        allowNull: false
+    },
+    issuer: {
+        type: DataTypes.TEXT,
+        allowNull: false
+    },
+    subject: {
+        type: DataTypes.TEXT,
+        allowNull: false
+    },
+    email: {
+        type: DataTypes.TEXT,
+        allowNull: true
+    },
+    createdAt: {
+        type: DataTypes.DATE,
+        allowNull: false,
+        field: 'created_at',
+        defaultValue: DataTypes.NOW
+    },
+    updatedAt: {
+        type: DataTypes.DATE,
+        allowNull: false,
+        field: 'updated_at',
+        defaultValue: DataTypes.NOW
+    }
+}, {
+    tableName: 'oauth_identity',
+    schema: 'community',
+    underscored: true,
+    timestamps: false,
+    indexes: [
+        {
+            unique: true,
+            fields: ['provider', 'subject']
+        },
+        {
+            fields: ['user_id']
+        }
+    ]
+});
+
+export default OAuthIdentity;

backend/models/index.js

@@ -8,6 +8,7 @@ import WidgetType from './type/widget_type.js';
 import User from './community/user.js';
 import UserParam from './community/user_param.js';
 import UserDashboard from './community/user_dashboard.js';
+import OAuthIdentity from './community/oauth_identity.js';
 import Login from './logs/login.js';
 import UserRight from './community/user_right.js';
 import InterestType from './type/interest.js';
@@ -168,6 +169,7 @@ const models = {
   User,
   UserParam,
   UserDashboard,
+  OAuthIdentity,
   Login,
   UserRight,
   InterestType,