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SPARQL Endpoint of the qendpoint.

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package com.the_qa_company.qendpoint.controller;

import com.the_qa_company.qendpoint.store.EndpointStoreUtils;
import com.the_qa_company.qendpoint.store.exception.EndpointStoreInputException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.apache.tomcat.util.http.fileupload.MultipartStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.server.ServerWebInputException;

import java.io.IOException;
import java.io.PipedInputStream;
import java.io.PipedOutputStream;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.Map;
import java.util.concurrent.atomic.AtomicReference;

@CrossOrigin(origins = "*")
@RestController
@RequestMapping("/api/endpoint")
public class EndpointController {
	public record FormatReturn(String query) {}

	private static final Logger logger = LoggerFactory.getLogger(EndpointController.class);

	@Autowired
	Sparql sparql;

	@RequestMapping(value = "/sparql")
	public void sparqlEndpoint(@RequestParam(value = "query", required = false) final String query,
			@RequestParam(value = "update", required = false) final String updateQuery,
			@RequestParam(value = "format", defaultValue = "json") final String format,
			@RequestHeader(value = "Accept", defaultValue = "application/sparql-results+json") String acceptHeader,
			@RequestHeader(value = "Accept-Language", defaultValue = "en") String acceptLanguageHeader,
			@RequestHeader(value = "QueryConfig", defaultValue = "") String queryConfig,
			@RequestHeader(value = "timeout", defaultValue = "-1") int timeout,
			@RequestHeader(value = "Content-Type", defaultValue = "text/plain") String content,

			@RequestBody(required = false) String body, HttpServletResponse response) throws IOException {
		try {
			if (query != null) {
				sparql.execute(query, timeout, acceptHeader, acceptLanguageHeader, response::setContentType,
						response.getOutputStream(), queryConfig);
			} else if (body != null && content.equals("application/sparql-query")) {
				sparql.execute(body, timeout, acceptHeader, acceptLanguageHeader, response::setContentType,
						response.getOutputStream(), queryConfig);
			} else if (updateQuery != null) {
				sparql.executeUpdate(updateQuery, timeout, response.getOutputStream());
			} else if (body != null) {
				sparql.executeUpdate(body, timeout, response.getOutputStream());
			} else {
				throw new ServerWebInputException("Query not specified");
			}
		} catch (EndpointStoreInputException e) {
			throw new ServerWebInputException(e.getMessage());
		}
	}

	@RequestMapping(value = "/update")
	public void sparqlUpdate(@RequestParam(value = "query") final String query,
			@RequestParam(value = "format", defaultValue = "json") final String format,
			@RequestHeader(value = "Accept", defaultValue = "application/sparql-results+json") String acceptHeader,
			@RequestParam(value = "timeout", defaultValue = "-1") int timeout, HttpServletResponse response)
			throws IOException {
		logger.info("Query " + query);
		if (format.equals("json")) {
			sparql.executeUpdate(query, timeout, response.getOutputStream());
		} else {
			throw new ServerWebInputException("Format not supported");
		}
	}

	private String extractBoundary(HttpServletRequest request) {
		String boundaryHeader = "boundary=";
		int i = request.getContentType().indexOf(boundaryHeader);
		if (i == -1) {
			throw new IllegalArgumentException("Can't find boundary= multipart");
		}
		return request.getContentType().substring(i + boundaryHeader.length());
	}

	private String[][] readContentDispositionHeader(String header) {
		return Arrays.stream(header.split("[\n\r]")).filter(s -> !s.isEmpty())
				.filter(s -> s.startsWith("Content-Disposition: "))
				.map(s -> s.substring("Content-Disposition: ".length())).flatMap(s -> Arrays.stream(s.split("; ")))
				.map(s -> s.split("=", 2)).toArray(String[][]::new);
	}

	@PostMapping(value = "/load", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
	public ResponseEntity clearData(HttpServletRequest request) throws IOException {
		// Files.copy(request.getInputStream(),Path.of("dump.bin"),
		// StandardCopyOption.REPLACE_EXISTING);
		String boundary = extractBoundary(request);
		MultipartStream multipartStream = new MultipartStream(request.getInputStream(),
				boundary.getBytes(StandardCharsets.UTF_8), 1024, null);
		boolean nextPart = multipartStream.skipPreamble();
		if (!nextPart) {
			throw new IllegalArgumentException("empty stream");
		}
		do {
			String header = multipartStream.readHeaders();
			String[][] cdHeader = readContentDispositionHeader(header);

			System.out.println("cdHeader:" + Arrays.deepToString(cdHeader));
			if (cdHeader.length == 0) {
				nextPart = multipartStream.readBoundary();
				continue; // not content-disposition header
			}

			String name = Arrays.stream(cdHeader).filter(s -> s[0].equals("name")).map(s -> s[1])
					.map(s -> s.startsWith("\"") ? s.substring(1, s.length() - 1) : s).findFirst().orElse(null);
			System.out.println("field:" + name);
			if (name == null || !name.equals("file")) {
				nextPart = multipartStream.readBoundary();
				continue; // not the file field
			}

			String filename = Arrays.stream(cdHeader).filter(s -> s[0].equals("filename")).map(s -> s[1])
					.map(s -> s.startsWith("\"") ? s.substring(1, s.length() - 1) : s).findFirst().orElse(null);

			PipedInputStream pipedInputStream = new PipedInputStream();
			PipedOutputStream pipedOutputStream = new PipedOutputStream();
			pipedInputStream.connect(pipedOutputStream);
			AtomicReference exception = new AtomicReference<>(null);
			Thread readingThread = new Thread(() -> {
				try {
					multipartStream.readBodyData(pipedOutputStream);
				} catch (IOException e) {
					exception.set(e);
				} finally {
					try {
						pipedOutputStream.close();
					} catch (IOException e) {
						exception.set(e);
					}
				}
			}, "ClearDataReadThread");
			readingThread.start();

			logger.info("Trying to index {}", filename);
			Sparql.LoadFileResult out;
			try {
				out = sparql.loadFile(pipedInputStream, filename);
			} catch (EndpointStoreInputException e) {
				throw new ServerWebInputException(e.getMessage());
			}
			try {
				readingThread.join();
			} catch (InterruptedException e) {
				//
			}
			// throw IOException of the read thread if required
			IOException e = exception.get();
			if (e != null) {
				throw e;
			}
			return ResponseEntity.status(HttpStatus.OK).body(out);
		} while (nextPart);
		throw new IllegalArgumentException("no stream field");
	}

	@GetMapping("/merge")
	public ResponseEntity mergeStore() {
		return ResponseEntity.status(HttpStatus.OK).body(sparql.askForAMerge());
	}

	@GetMapping("/dump")
	public ResponseEntity dumpStore() {
		return ResponseEntity.status(HttpStatus.OK).body(sparql.askForADump());
	}

	@GetMapping("/is_dumping")
	public ResponseEntity isDumping() {
		return ResponseEntity.status(HttpStatus.OK).body(sparql.isDumping());
	}

	@GetMapping("/reindex")
	public ResponseEntity reindex(
			@RequestParam(value = "index", defaultValue = "all") final String index) throws Exception {
		return ResponseEntity.status(HttpStatus.OK)
				.body(index == null || index.equals("all") ? sparql.reindexLucene() : sparql.reindexLucene(index));
	}

	@GetMapping("/lucenes")
	public ResponseEntity lucenes() {
		return ResponseEntity.status(HttpStatus.OK).body(sparql.lucenes());
	}

	@GetMapping("/has_index")
	public ResponseEntity hasIndex() {
		return ResponseEntity.status(HttpStatus.OK).body(sparql.hasLuceneSail());
	}

	@GetMapping("/is_merging")
	public ResponseEntity isMerging() {
		return ResponseEntity.status(HttpStatus.OK).body(sparql.isMerging());
	}

	@GetMapping("/prefixes")
	public ResponseEntity> prefixes() {
		return ResponseEntity.status(HttpStatus.OK).body(sparql.getPrefixes());
	}

	@PostMapping("/setprefixes")
	public ResponseEntity> setPrefixes(@RequestBody final Map prefixes)
			throws IOException {
		sparql.setPrefixes(prefixes);
		return prefixes();
	}

	@RequestMapping(path = "format", method = { RequestMethod.POST, RequestMethod.GET })
	public ResponseEntity format(@RequestBody(required = false) final String query,
			@RequestParam(value = "query", required = false) final String paramQuery,
			@RequestParam(value = "baseURI", required = false) final String baseURI) throws Exception {
		String q;
		if (query != null) {
			q = query;
		} else if (paramQuery != null) {
			q = paramQuery;
		} else {
			return ResponseEntity.badRequest().build();
		}
		return ResponseEntity.ok(new FormatReturn(EndpointStoreUtils.formatSPARQLQuery(q, baseURI)));
	}

	@GetMapping("/")
	public ResponseEntity home() {
		return ResponseEntity.status(HttpStatus.OK).body("ok");
	}
}




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