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package org.apache.james.webadmin.routes;

import static org.apache.james.webadmin.routes.MailboxesRoutes.TASK_PARAMETER;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.nio.charset.StandardCharsets;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;

import javax.inject.Inject;
import javax.inject.Named;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;

import org.apache.james.core.Domain;
import org.apache.james.core.Username;
import org.apache.james.core.quota.QuotaCountLimit;
import org.apache.james.core.quota.QuotaSizeLimit;
import org.apache.james.mailbox.quota.task.RecomputeCurrentQuotasService;
import org.apache.james.mailbox.quota.task.RecomputeCurrentQuotasService.RunningOptions;
import org.apache.james.mailbox.quota.task.RecomputeCurrentQuotasTask;
import org.apache.james.quota.search.Limit;
import org.apache.james.quota.search.Offset;
import org.apache.james.quota.search.QuotaBoundary;
import org.apache.james.quota.search.QuotaQuery;
import org.apache.james.task.TaskManager;
import org.apache.james.user.api.UsersRepository;
import org.apache.james.user.api.UsersRepositoryException;
import org.apache.james.webadmin.Routes;
import org.apache.james.webadmin.dto.QuotaDTO;
import org.apache.james.webadmin.dto.QuotaDetailsDTO;
import org.apache.james.webadmin.dto.ValidatedQuotaDTO;
import org.apache.james.webadmin.service.UserQuotaService;
import org.apache.james.webadmin.tasks.TaskFromRequestRegistry;
import org.apache.james.webadmin.tasks.TaskIdDto;
import org.apache.james.webadmin.tasks.TaskRegistrationKey;
import org.apache.james.webadmin.utils.ErrorResponder;
import org.apache.james.webadmin.utils.ErrorResponder.ErrorType;
import org.apache.james.webadmin.utils.JsonExtractException;
import org.apache.james.webadmin.utils.JsonExtractor;
import org.apache.james.webadmin.utils.JsonTransformer;
import org.apache.james.webadmin.utils.JsonTransformerModule;
import org.apache.james.webadmin.utils.ParametersExtractor;
import org.apache.james.webadmin.utils.Responses;
import org.apache.james.webadmin.validation.QuotaDTOValidator;
import org.apache.james.webadmin.validation.Quotas;
import org.eclipse.jetty.http.HttpStatus;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiResponse;
import io.swagger.annotations.ApiResponses;
import spark.Request;
import spark.Route;
import spark.Service;

@Api(tags = "UserQuota")
@Path(UserQuotaRoutes.USERS_QUOTA_ENDPOINT)
@Produces("application/json")
public class UserQuotaRoutes implements Routes {

    public static final String USER_QUOTAS_OPERATIONS_INJECTION_KEY = "userQuotasOperations";

    public static class RecomputeCurrentQuotasRequestToTask extends TaskFromRequestRegistry.TaskRegistration {
        private static final String USERS_PER_SECOND = "usersPerSecond";

        @Inject
        public RecomputeCurrentQuotasRequestToTask(RecomputeCurrentQuotasService service) {
            super(RECOMPUTE_CURRENT_QUOTAS, request -> new RecomputeCurrentQuotasTask(service,parseRunningOptions(request)));
        }

        private static RunningOptions parseRunningOptions(Request request) {
            return intQueryParameter(request)
                .map(RunningOptions::withUsersPerSecond)
                .orElse(RunningOptions.DEFAULT);
        }

        private static Optional intQueryParameter(Request request) {
            try {
                return Optional.ofNullable(request.queryParams(USERS_PER_SECOND))
                    .map(Integer::parseInt);
            } catch (NumberFormatException e) {
                throw new IllegalArgumentException(String.format("Illegal value supplied for query parameter '%s', expecting a " +
                    "strictly positive optional integer", USERS_PER_SECOND), e);
            }
        }
    }

    private static final TaskRegistrationKey RECOMPUTE_CURRENT_QUOTAS = TaskRegistrationKey.of("RecomputeCurrentQuotas");
    private static final String USER = "user";
    private static final String MIN_OCCUPATION_RATIO = "minOccupationRatio";
    private static final String MAX_OCCUPATION_RATIO = "maxOccupationRatio";
    private static final String DOMAIN = "domain";
    public static final String USERS_QUOTA_ENDPOINT = "/quota/users";
    private static final String QUOTA_ENDPOINT = USERS_QUOTA_ENDPOINT + "/:" + USER;
    private static final String COUNT_ENDPOINT = QUOTA_ENDPOINT + "/count";
    private static final String SIZE_ENDPOINT = QUOTA_ENDPOINT + "/size";

    private final UsersRepository usersRepository;
    private final UserQuotaService userQuotaService;
    private final JsonTransformer jsonTransformer;
    private final JsonExtractor jsonExtractor;
    private final QuotaDTOValidator quotaDTOValidator;
    private final TaskManager taskManager;
    private final Set usersQuotasTaskRegistration;
    private Service service;

    @Inject
    public UserQuotaRoutes(UsersRepository usersRepository,
                           UserQuotaService userQuotaService,
                           JsonTransformer jsonTransformer,
                           Set modules,
                           TaskManager taskManager,
                           @Named(USER_QUOTAS_OPERATIONS_INJECTION_KEY) Set usersQuotasTaskRegistration) {
        this.usersRepository = usersRepository;
        this.userQuotaService = userQuotaService;
        this.jsonTransformer = jsonTransformer;
        this.jsonExtractor = new JsonExtractor<>(QuotaDTO.class, modules.stream().map(JsonTransformerModule::asJacksonModule).collect(Collectors.toList()));
        this.quotaDTOValidator = new QuotaDTOValidator();
        this.taskManager = taskManager;
        this.usersQuotasTaskRegistration = usersQuotasTaskRegistration;
    }

    @Override
    public String getBasePath() {
        return USERS_QUOTA_ENDPOINT;
    }

    @Override
    public void define(Service service) {
        this.service = service;

        defineGetQuotaCount();
        defineDeleteQuotaCount();
        defineUpdateQuotaCount();

        defineGetQuotaSize();
        defineDeleteQuotaSize();
        defineUpdateQuotaSize();

        defineGetQuota();
        defineUpdateQuota();

        defineGetUsersQuota();
        definePostUsersQuota();
        definePostUsersQuota()
            .ifPresent(route -> service.post(USERS_QUOTA_ENDPOINT, route, jsonTransformer));
    }

    @POST
    @ApiOperation(value = "Recomputing current quotas of users")
    @ApiImplicitParams({
        @ApiImplicitParam(
            required = true,
            name = "task",
            paramType = "query parameter",
            dataType = "String",
            defaultValue = "none",
            example = "?task=RecomputeCurrentQuotas",
            value = "Compulsory. Only supported value is `RecomputeCurrentQuotas`")
    })
    @ApiResponses(value = {
        @ApiResponse(code = HttpStatus.CREATED_201, message = "Task is created", response = TaskIdDto.class),
        @ApiResponse(code = HttpStatus.INTERNAL_SERVER_ERROR_500, message = "Internal server error - Something went bad on the server side."),
        @ApiResponse(code = HttpStatus.BAD_REQUEST_400, message = "Bad request - details in the returned error message")
    })
    public Optional definePostUsersQuota() {
        return TaskFromRequestRegistry.builder()
            .parameterName(TASK_PARAMETER)
            .registrations(usersQuotasTaskRegistration)
            .buildAsRouteOptional(taskManager);
    }

    @PUT
    @ApiOperation(value = "Updating count and size at the same time")
    @ApiImplicitParams({
            @ApiImplicitParam(required = true, dataTypeClass = QuotaDTO.class, paramType = "body")
    })
    @ApiResponses(value = {
            @ApiResponse(code = HttpStatus.NO_CONTENT_204, message = "OK. The value has been updated."),
            @ApiResponse(code = HttpStatus.BAD_REQUEST_400, message = "The body is not a positive integer or not unlimited value (-1)."),
            @ApiResponse(code = HttpStatus.NOT_FOUND_404, message = "The user name does not exist."),
            @ApiResponse(code = HttpStatus.INTERNAL_SERVER_ERROR_500, message = "Internal server error - Something went bad on the server side.")
    })
    public void defineUpdateQuota() {
        service.put(QUOTA_ENDPOINT, ((request, response) -> {
            try {
                Username username = checkUserExist(request);
                QuotaDTO quotaDTO = jsonExtractor.parse(request.body());
                ValidatedQuotaDTO validatedQuotaDTO = quotaDTOValidator.validatedQuotaDTO(quotaDTO);
                userQuotaService.defineQuota(username, validatedQuotaDTO);
                return Responses.returnNoContent(response);
            } catch (IllegalArgumentException e) {
                throw ErrorResponder.builder()
                    .statusCode(HttpStatus.BAD_REQUEST_400)
                    .type(ErrorType.INVALID_ARGUMENT)
                    .message("Quota should be positive or unlimited (-1)")
                    .cause(e)
                    .haltError();
            }
        }));
    }

    @GET
    @ApiOperation(
        value = "Reading count and size at the same time",
        notes = "If there is no limitation for count and/or size, the returned value will be -1"
    )
    @ApiResponses(value = {
            @ApiResponse(code = HttpStatus.OK_200, message = "OK", response = QuotaDetailsDTO.class),
            @ApiResponse(code = HttpStatus.NOT_FOUND_404, message = "The user name does not exist."),
            @ApiResponse(code = HttpStatus.INTERNAL_SERVER_ERROR_500, message = "Internal server error - Something went bad on the server side.")
    })
    public void defineGetQuota() {
        service.get(QUOTA_ENDPOINT, (request, response) -> {
            Username username = checkUserExist(request);
            return userQuotaService.getQuota(username);
        }, jsonTransformer);
    }

    @GET
    @ApiOperation(
        value = "Reading count and size at the same time",
        notes = "If there is no limitation for count and/or size, the returned value will be -1"
    )
    @ApiImplicitParams({
        @ApiImplicitParam(
                required = false,
                name = "minOccuptationRatio",
                paramType = "query parameter",
                dataType = "Double",
                example = "?minOccuptationRatio=0.8",
                value = "If present, filter the users with occupation ratio lesser than this value."),
        @ApiImplicitParam(
                required = false,
                name = "maxOccupationRatio",
                paramType = "query parameter",
                dataType = "Double",
                example = "?maxOccupationRatio=0.99",
                value = "If present, filter the users with occupation ratio greater than this value."),
        @ApiImplicitParam(
                required = false,
                paramType = "query parameter",
                name = "limit",
                dataType = "Integer",
                example = "?limit=100",
                value = "If present, fixes the maximal number of key returned in that call. Must be more than zero if specified."),
        @ApiImplicitParam(
                required = false,
                name = "offset",
                paramType = "query parameter",
                dataType = "Integer",
                example = "?offset=100",
                value = "If present, skips the given number of key in the output."),
        @ApiImplicitParam(
                required = false,
                name = "domain",
                paramType = "query parameter",
                dataType = "String",
                example = "?domain=james.org",
                value = "If present, filter the users by this domain.")
    })
    @ApiResponses(value = {
            @ApiResponse(code = HttpStatus.OK_200, message = "OK", response = QuotaDetailsDTO.class),
            @ApiResponse(code = HttpStatus.BAD_REQUEST_400, message = "Validation issues with parameters"),
            @ApiResponse(code = HttpStatus.INTERNAL_SERVER_ERROR_500, message = "Internal server error - Something went bad on the server side.")
    })
    public void defineGetUsersQuota() {
        service.get(USERS_QUOTA_ENDPOINT, (request, response) -> {
            QuotaQuery quotaQuery = QuotaQuery.builder()
                .lessThan(extractQuotaBoundary(request, MAX_OCCUPATION_RATIO))
                .moreThan(extractQuotaBoundary(request, MIN_OCCUPATION_RATIO))
                .hasDomain(extractDomain(request, DOMAIN))
                .withLimit(extractLimit(request))
                .withOffset(extractOffset(request))
                .build();

            return userQuotaService.getUsersQuota(quotaQuery);
        }, jsonTransformer);
    }

    public Optional extractDomain(Request request, String parameterName) {
        return Optional.ofNullable(request.queryParams(parameterName)).map(Domain::of);
    }

    public Optional extractQuotaBoundary(Request request, String parameterName) {
        return ParametersExtractor.extractPositiveDouble(request, parameterName)
            .map(QuotaBoundary::new);
    }

    public Limit extractLimit(Request request) {
        return ParametersExtractor.extractLimit(request)
            .getLimit()
            .map(Limit::of)
            .orElse(Limit.unlimited());
    }

    public Offset extractOffset(Request request) {
        return Offset.of(ParametersExtractor.extractOffset(request)
            .getOffset());
    }

    @DELETE
    @Path("/size")
    @ApiOperation(value = "Removing per user mail size limitation by updating to unlimited value")
    @ApiResponses(value = {
            @ApiResponse(code = HttpStatus.NO_CONTENT_204, message = "The value is updated to unlimited value."),
            @ApiResponse(code = HttpStatus.NOT_FOUND_404, message = "The user name does not exist."),
            @ApiResponse(code = HttpStatus.INTERNAL_SERVER_ERROR_500, message = "Internal server error - Something went bad on the server side.")
    })
    public void defineDeleteQuotaSize() {
        service.delete(SIZE_ENDPOINT, (request, response) -> {
            Username username = checkUserExist(request);
            userQuotaService.deleteMaxSizeQuota(username);
            return Responses.returnNoContent(response);
        });
    }

    @PUT
    @Path("/size")
    @ApiOperation(value = "Updating per user mail size limitation")
    @ApiImplicitParams({
            @ApiImplicitParam(required = true, dataType = "integer", paramType = "body")
    })
    @ApiResponses(value = {
            @ApiResponse(code = HttpStatus.NO_CONTENT_204, message = "OK. The value has been updated."),
            @ApiResponse(code = HttpStatus.BAD_REQUEST_400, message = "The body is not a positive integer nor -1."),
            @ApiResponse(code = HttpStatus.NOT_FOUND_404, message = "The user name does not exist."),
            @ApiResponse(code = HttpStatus.INTERNAL_SERVER_ERROR_500, message = "Internal server error - Something went bad on the server side.")
    })
    public void defineUpdateQuotaSize() {
        service.put(SIZE_ENDPOINT, (request, response) -> {
            Username username = checkUserExist(request);
            QuotaSizeLimit quotaSize = Quotas.quotaSize(request.body());
            userQuotaService.defineMaxSizeQuota(username, quotaSize);
            return Responses.returnNoContent(response);
        });
    }

    @GET
    @Path("/size")
    @ApiOperation(value = "Reading per user mail size limitation")
    @ApiResponses(value = {
            @ApiResponse(code = HttpStatus.OK_200, message = "OK", response = Long.class),
            @ApiResponse(code = HttpStatus.NO_CONTENT_204, message = "No value defined"),
            @ApiResponse(code = HttpStatus.NOT_FOUND_404, message = "The user name does not exist."),
            @ApiResponse(code = HttpStatus.INTERNAL_SERVER_ERROR_500, message = "Internal server error - Something went bad on the server side.")
    })
    public void defineGetQuotaSize() {
        service.get(SIZE_ENDPOINT, (request, response) -> {
            Username username = checkUserExist(request);
            Optional maxSizeQuota = userQuotaService.getMaxSizeQuota(username);
            if (maxSizeQuota.isPresent()) {
                return maxSizeQuota;
            }
            return Responses.returnNoContent(response);
        }, jsonTransformer);
    }

    @DELETE
    @Path("/count")
    @ApiOperation(value = "Removing per user mail count limitation by updating to unlimited value")
    @ApiResponses(value = {
            @ApiResponse(code = HttpStatus.NO_CONTENT_204, message = "The value is updated to unlimited value."),
            @ApiResponse(code = HttpStatus.NOT_FOUND_404, message = "The user name does not exist."),
            @ApiResponse(code = HttpStatus.INTERNAL_SERVER_ERROR_500, message = "Internal server error - Something went bad on the server side.")
    })
    public void defineDeleteQuotaCount() {
        service.delete(COUNT_ENDPOINT, (request, response) -> {
            Username username = checkUserExist(request);
            userQuotaService.deleteMaxCountQuota(username);
            return Responses.returnNoContent(response);
        });
    }

    @PUT
    @Path("/count")
    @ApiOperation(value = "Updating per user mail count limitation")
    @ApiImplicitParams({
            @ApiImplicitParam(required = true, dataType = "integer", paramType = "body")
    })
    @ApiResponses(value = {
            @ApiResponse(code = HttpStatus.NO_CONTENT_204, message = "OK. The value has been updated."),
            @ApiResponse(code = HttpStatus.BAD_REQUEST_400, message = "The body is not a positive integer nor -1."),
            @ApiResponse(code = HttpStatus.NOT_FOUND_404, message = "The user name does not exist."),
            @ApiResponse(code = HttpStatus.INTERNAL_SERVER_ERROR_500, message = "Internal server error - Something went bad on the server side.")
    })
    public void defineUpdateQuotaCount() {
        service.put(COUNT_ENDPOINT, (request, response) -> {
            Username username = checkUserExist(request);
            QuotaCountLimit quotaCount = Quotas.quotaCount(request.body());
            userQuotaService.defineMaxCountQuota(username, quotaCount);
            return Responses.returnNoContent(response);
        });
    }

    @GET
    @Path("/count")
    @ApiOperation(value = "Reading per user mail count limitation")
    @ApiResponses(value = {
            @ApiResponse(code = HttpStatus.OK_200, message = "OK", response = Long.class),
            @ApiResponse(code = HttpStatus.NO_CONTENT_204, message = "No value defined"),
            @ApiResponse(code = HttpStatus.NOT_FOUND_404, message = "The user name does not exist."),
            @ApiResponse(code = HttpStatus.INTERNAL_SERVER_ERROR_500, message = "Internal server error - Something went bad on the server side.")
    })
    public void defineGetQuotaCount() {
        service.get(COUNT_ENDPOINT, (request, response) -> {
            Username username = checkUserExist(request);
            Optional maxCountQuota = userQuotaService.getMaxCountQuota(username);
            if (maxCountQuota.isPresent()) {
                return maxCountQuota;
            }
            return Responses.returnNoContent(response);
        }, jsonTransformer);
    }

    private Username checkUserExist(Request request) throws UsersRepositoryException, UnsupportedEncodingException {
        String user = URLDecoder.decode(request.params(USER),
            StandardCharsets.UTF_8.displayName());

        Username username = Username.of(user);

        if (!usersRepository.contains(username)) {
            throw ErrorResponder.builder()
                .statusCode(HttpStatus.NOT_FOUND_404)
                .type(ErrorType.NOT_FOUND)
                .message("User not found")
                .haltError();
        }
        return username;
    }

    private QuotaDTO parseQuotaDTO(Request request) {
        try {
            return jsonExtractor.parse(request.body());
        } catch (IllegalArgumentException e) {
            throw ErrorResponder.builder()
                .statusCode(HttpStatus.BAD_REQUEST_400)
                .type(ErrorType.INVALID_ARGUMENT)
                .message("Quota should be positive or unlimited (-1)")
                .cause(e)
                .haltError();
        } catch (JsonExtractException e) {
            throw ErrorResponder.builder()
                .statusCode(HttpStatus.BAD_REQUEST_400)
                .type(ErrorType.INVALID_ARGUMENT)
                .message("Malformed JSON input")
                .cause(e)
                .haltError();
        }
    }

}




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