graphql-spring-boot upload binary

Question

I am trying to upload a GraphQL mutation and an image as application/form-data. The GraphQL part is working, but I would like to \'save\' the uploaded binary and add the pat

Answer 1

Spring boot's embedded Tomcat is defaulted to Servlet 3.x multipart support. GraphQL java servlet supports commons FileUpload. To make things work you have to disable Spring boots default multipart config, like:

Add maven dependency for commons-fileupload in pom.xml

    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.3</version>
    </dependency>

Application.yml

spring:
    servlet:
      multipart:
         enabled: false

Spring Boot Application class

@EnableAutoConfiguration(exclude={MultipartAutoConfiguration.class})

And in your @Configuration add a @Bean

@Bean(name = "multipartResolver")
public CommonsMultipartResolver multipartResolver() {
    CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
    multipartResolver.setMaxUploadSize(100000);
    return multipartResolver;
}

Now you can find the uploaded multipart files in the GraphQL Context because they are automatically mapped to:

environment -> context -> files

Accessible from the DataFetchingEnvironment

And the implementation example of the mutation:

@Component
public class Mutation implements GraphQLMutationResolver {

    @Autowired
    private TokenService tokenService;

    @Autowired
    private UserRepository userRepository;

    @Autowired
    private UserService userService;

    @Autowired
    private ProjectRepository repository;

    @Autowired
    @Qualifier( value = "modeshape" )
    private StorageService storageService;

    @GraphQLField @GraphQLRelayMutation
    public ProjectItem createProject( CreateProjectInput input, DataFetchingEnvironment environment ) {
        Project project = new Project( input.getName() );
        project.setDescription( input.getDescription() );
        GraphQLContext context = environment.getContext();
        Optional<Map<String, List<FileItem>>> files = context.getFiles();
        files.ifPresent( keys -> {
            List<FileItem> file = keys.get( "file" );
            List<StorageService.FileInfo> storedFiles = file.stream().map( f -> storageService.store( f, "files", true ) ).collect( Collectors.toList() );
            project.setFile( storedFiles.get( 0 ).getUuid() );
        } );
        repository.save( project );
        return new ProjectItem( project );
    }
class CreateProjectInput {
    private String name;
    private String description;
    private String clientMutationId;

    @GraphQLField
    public String getName() {
        return name;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription( String description ) {
        this.description = description;
    }

    @GraphQLField
    public String getClientMutationId() {
        return clientMutationId;
    }
}