java - 如何使用 graphql-java 从请求 header 设置上下文

Question

我希望能够从从请求收到的 http 请求 header 中设置上下文变量。这将是一个 jwt token ，因此我可以在每次查询时识别我的用户。

package br.com.b2breservas.api;

import com.google.common.base.Charsets;
import com.google.common.io.Resources;
import graphql.GraphQL;
import graphql.schema.GraphQLSchema;
import graphql.schema.idl.RuntimeWiring;
import graphql.schema.idl.SchemaGenerator;
import graphql.schema.idl.SchemaParser;
import graphql.schema.idl.TypeDefinitionRegistry;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import java.io.IOException;
import java.net.URL;

import static graphql.schema.idl.TypeRuntimeWiring.newTypeWiring;

@Component
public class GraphQLProvider   {


    @Autowired
    GraphQLDataFetchers graphQLDataFetchers;

    private GraphQL graphQL;

    @PostConstruct
    public void init() throws IOException {
        URL url = Resources.getResource("schema.graphqls");
        String sdl = Resources.toString(url, Charsets.UTF_8);
        GraphQLSchema graphQLSchema = buildSchema(sdl);
        this.graphQL = GraphQL.newGraphQL(graphQLSchema).build();
    }

    private GraphQLSchema buildSchema(String sdl) {
        TypeDefinitionRegistry typeRegistry = new SchemaParser().parse(sdl);
        RuntimeWiring runtimeWiring = buildWiring();
        SchemaGenerator schemaGenerator = new SchemaGenerator();
        return schemaGenerator.makeExecutableSchema(typeRegistry, runtimeWiring);
    }

    private RuntimeWiring buildWiring() {
        return RuntimeWiring.newRuntimeWiring()
                .type(newTypeWiring("Query")
                        .dataFetcher("books", graphQLDataFetchers.getBooks()))
                .type(newTypeWiring("Query")
                        .dataFetcher("bookById", graphQLDataFetchers.getBookByIdDataFetcher()))
                .type(newTypeWiring("Book")
                        .dataFetcher("author", graphQLDataFetchers.getAuthorDataFetcher()))
                .build();
    }

    @Bean
    public GraphQL graphQL() {
        return graphQL;
    }

}

Answer 1

您可以创建一个内部包含 JWT 或仅包含 HttpServletRequest 的自定义对象:

public class GraphQLContext {
    private HttpServletRequest httpServletRequest;
} 

执行 GraphQL 查询时，您创建此上下文对象并将其设置为 ExecutionInput。大多数Web框架应该提供一些方法来轻松访问当前的HttpServletRequest:

GraphQLContext context = new GraphQLContext(httpServletRequest);
ExecutionInput executionInput = ExecutionInput.newExecutionInput()
                .query(query)
                .context(context)
                .build();

ExecutionResult result = graphQL.execute(executionInput);

然后在数据 getter 中，可以通过以下方式获取上下文:

@Override
public Object get(DataFetchingEnvironment env) throws Exception {

    GraphQLContext context = env.getContext();
    HttpServletRequest httpServletRequest = context.getHttpServletRequest();

}