模拟和用户切换

这是 GraphQL 库版本 6 的文档。对于长期支持 (LTS) 版本 5，请参阅 GraphQL 库版本 5 LTS。

模拟和用户切换是 Neo4j 数据库和驱动程序的功能，允许在与初始连接不同的上下文中执行查询。

模拟

模拟仍然以原始配置的用户身份对数据库进行身份验证，但以模拟用户的上下文运行查询。模拟用户时，查询将在模拟用户的完整安全上下文中运行，而不是已验证的用户（主数据库、权限等）。

以下是如何根据请求模拟不同用户的示例。此处要模拟的用户取自 HTTP 标头 User

import { ApolloServer } from "@apollo/server";
import { startStandaloneServer } from "@apollo/server/standalone";
import { Neo4jGraphQL } from "@neo4j/graphql";
import neo4j from "neo4j-driver";

const typeDefs = `#graphql
    type Movie @node {
        title: String!
    }
`;

const driver =  neo4j.driver(
    "neo4j://localhost:7687",
    neo4j.auth.basic("username", "password")
);

const neo4jGraphql = new Neo4jGraphQL({
    typeDefs,
    driver,
});

const schema = await neo4jGraphql.getSchema();

const server = new ApolloServer({
  schema,
});

const { url } = await startStandaloneServer(server, {
  // Your async context function should async and return an object
  context: async ({ req }) => ({
    sessionConfig: {
        impersonatedUser: req.headers.user,
    },
  }),
});

console.log(`🚀  Server ready at: ${url}`);

import { ApolloServer } from "@apollo/server";
import { startStandaloneServer } from "@apollo/server/standalone";
import { Neo4jGraphQL, Neo4jGraphQLContext } from "@neo4j/graphql";
import neo4j from "neo4j-driver";

const typeDefs = `#graphql
    type Movie @node {
        title: String!
    }
`;

const driver =  neo4j.driver(
    "neo4j://localhost:7687",
    neo4j.auth.basic("username", "password")
);

const neo4jGraphql = new Neo4jGraphQL({
    typeDefs,
    driver,
});

const schema = await neo4jGraphql.getSchema();

const server = new ApolloServer<Neo4jGraphQLContext>({
  schema,
});

const { url } = await startStandaloneServer(server, {
  // Your async context function should async and return an object
  context: async ({ req }) => ({
    sessionConfig: {
        impersonatedUser: req.headers.user,
    },
  }),
});

console.log(`🚀  Server ready at: ${url}`);

用户切换

用户切换完全切换了在给定会话中使用数据库进行身份验证的用户，而无需实例化全新的驱动程序实例的性能成本。

在下面的示例中可以找到在每个请求的基础上配置用户切换的示例。请注意，用户名和密码在 HTTP 标头 User 和 Password 中提供，但这不建议用于生产环境

import { ApolloServer } from "@apollo/server";
import { startStandaloneServer } from "@apollo/server/standalone";
import { Neo4jGraphQL } from "@neo4j/graphql";
import neo4j from "neo4j-driver";

const typeDefs = `#graphql
    type Movie @node {
        title: String!
    }
`;

const driver =  neo4j.driver(
    "neo4j://localhost:7687",
    neo4j.auth.basic("username", "password")
);

const neo4jGraphql = new Neo4jGraphQL({
    typeDefs,
    driver,
});

const schema = await neo4jGraphql.getSchema();

const server = new ApolloServer({
  schema,
});

const { url } = await startStandaloneServer(server, {
  // Your async context function should async and return an object
  context: async ({ req }) => ({
    sessionConfig: {
        auth: neo4j.auth.basic(req.headers.user, req.headers.password),
    },
  }),
});

console.log(`🚀  Server ready at: ${url}`);

import { ApolloServer } from "@apollo/server";
import { startStandaloneServer } from "@apollo/server/standalone";
import { Neo4jGraphQL, Neo4jGraphQLContext } from "@neo4j/graphql";
import neo4j from "neo4j-driver";

const typeDefs = `#graphql
    type Movie @node {
        title: String!
    }
`;

const driver =  neo4j.driver(
    "neo4j://localhost:7687",
    neo4j.auth.basic("username", "password")
);

const neo4jGraphql = new Neo4jGraphQL({
    typeDefs,
    driver,
});

const schema = await neo4jGraphql.getSchema();

const server = new ApolloServer<Neo4jGraphQLContext>({
  schema,
});

const { url } = await startStandaloneServer(server, {
  // Your async context function should async and return an object
  context: async ({ req }) => ({
    sessionConfig: {
        auth: neo4j.auth.basic(req.headers.user, req.headers.password),
    },
  }),
});

console.log(`🚀  Server ready at: ${url}`);