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GraphQLEndpoint.java
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GraphQLEndpoint.java
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package com.howtographql.hackernews;
import com.coxautodev.graphql.tools.SchemaParser;
import com.mongodb.MongoClient;
import com.mongodb.client.MongoDatabase;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import graphql.ExceptionWhileDataFetching;
import graphql.GraphQLError;
import graphql.schema.GraphQLSchema;
import graphql.servlet.GraphQLContext;
import graphql.servlet.SimpleGraphQLServlet;
/**
* The servlet acting as the GraphQL endpoint
*/
@WebServlet(urlPatterns = "/graphql")
public class GraphQLEndpoint extends SimpleGraphQLServlet {
private static final LinkRepository linkRepository;
private static final UserRepository userRepository;
private static final VoteRepository voteRepository;
static {
MongoDatabase mongo = new MongoClient().getDatabase("hackernews");
linkRepository = new LinkRepository(mongo.getCollection("links"));
userRepository = new UserRepository(mongo.getCollection("users"));
voteRepository = new VoteRepository(mongo.getCollection("votes"));
}
public GraphQLEndpoint() {
super(buildSchema());
}
private static GraphQLSchema buildSchema() {
return SchemaParser.newParser()
.file("schema.graphqls")
.resolvers(
new Query(linkRepository),
new Mutation(linkRepository, userRepository, voteRepository),
new SigninResolver(),
new LinkResolver(userRepository),
new VoteResolver(linkRepository, userRepository))
.scalars(Scalars.dateTime)
.build()
.makeExecutableSchema();
}
@Override
protected GraphQLContext createContext(Optional<HttpServletRequest> request, Optional<HttpServletResponse> response) {
User user = request
.map(req -> req.getHeader("Authorization"))
.filter(id -> !id.isEmpty())
.map(id -> id.replace("Bearer ", ""))
.map(userRepository::findById)
.orElse(null);
return new AuthContext(user, request, response);
}
@Override
protected List<GraphQLError> filterGraphQLErrors(List<GraphQLError> errors) {
return errors.stream()
.filter(e -> e instanceof ExceptionWhileDataFetching || super.isClientError(e))
.map(e -> e instanceof ExceptionWhileDataFetching ? new SanitizedError((ExceptionWhileDataFetching) e) : e)
.collect(Collectors.toList());
}
}