How to Upload files with Spring GraphQlClient? - spring-graphql

Question

I'm looking at the docs, but it does not mention file Upload.
The GraphQl Upload service I need to consume is this one.
Would it be possible with GraphQlClient?

Answer 1

I believe it is possible indeed.
You should build your GraphQlClient or reuse a previous one. Then, you should write the the document (or refer to an existing one using documentName) specifying the variables required. Finally, you assign that variable to a value, which can be any Object (in your case, a file; in my example, an Integer number 1), using the variable method of the RequestSpec.
graphQlClient
.mutate()
.header("Authorization","Basic XXXXX")
.build()
.document("""
query artistaPorId($unId:ID){
artistaPorId(id:$unId){
apellido
}
}
""")
.variable("unId",1)
.retrieve("artistaPorId")
.toEntity(Artista.class)
.subscribe( // handle onNext, onError, etc
);
My schema.graphqls:
type Query {
artistaPorId(id:ID): Artista
}
type Artista {
id: ID
apellido: String
estilo: String
}

Answer 2

I have figured it out with the help of this answner.
This uses Spring WebClient. I just need to figure it out how to extract data from the response (it's a graphql response).
var variables = new LinkedHashMap<String, Object>();
variables.put("cartao", cartao);
variables.put("mime", MediaType.APPLICATION_PDF_VALUE);
variables.put("file", null);
var query = StreamUtils.copyToString(new ClassPathResource("/graphql-documents/UploadPrescriptionMutation.graphql").getInputStream(),
Charset.defaultCharset());
var params = new LinkedHashMap<String, Object>();
params.put("operationName", "upload");
params.put("query", query);
params.put("variables", variables);
MultipartBodyBuilder builder = new MultipartBodyBuilder();
builder.part("operations", objectMapper.writeValueAsString(params));
builder.part("map", "{\"uploaded_file\": [\"variables.file\"]}");
builder.part("uploaded_file", new FileSystemResource(file));
return webClient.post()
.headers(h -> h.setBearerAuth(token))
.contentType(MediaType.MULTIPART_FORM_DATA)
.body(BodyInserters.fromMultipartData(builder.build()))
.retrieve()
.bodyToMono(Prescription_AddPrescriptionDto.class)
.block();
GraphQL file:
mutation upload($file: Prescription_Upload!, $cartao: String!, $mime: String!) {
Prescription_uploadPrescription(
file: $file uploadInfo: {
cardNumber: $cartao
source: UNKNOWN
mime: $mime })
{
id
uploadedAt
deletedAt
expiresAt
source
file
name
cardNumber
identity
status
storage
originalName
extension
}
}