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/*
 * Copyright (C) 2016 FormKiQ Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.formkiq.server.api;

import static javax.servlet.http.HttpServletResponse.SC_FORBIDDEN;
import static javax.servlet.http.HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
import static javax.servlet.http.HttpServletResponse.SC_NOT_FOUND;
import static javax.servlet.http.HttpServletResponse.SC_OK;
import static javax.servlet.http.HttpServletResponse.SC_UNAUTHORIZED;
import static org.springframework.web.bind.annotation.RequestMethod.GET;
import static org.springframework.web.bind.annotation.RequestMethod.POST;

import java.io.IOException;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.transaction.Transactional;

import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpEntity;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.web.bind.MissingServletRequestParameterException;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

import com.formkiq.server.domain.type.FolderFormStatus;
import com.formkiq.server.domain.type.FolderFormsListDTO;
import com.formkiq.server.domain.type.FormDTO;
import com.formkiq.server.domain.type.FormOrderByField;
import com.formkiq.server.domain.type.SortDirection;
import com.formkiq.server.service.FolderService;
import com.formkiq.server.service.PreconditionFailedException;
import com.formkiq.server.service.SpringSecurityService;
import com.formkiq.server.util.Strings;

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;

/**
 * FoldersController rest services.
 *
 */
@RestController
public class FolderFilesController extends AbstractRestController {

    /** Root URI. */
    private static final String ROOT = "/api/folders/files";

    /** GET Folder File url. */
    public static final String API_FOLDER_FILE_GET      = ROOT + "/get";
    /** SYNC url. */
    public static final String API_FOLDER_FILE_SAVE     = ROOT + "/save";
    /** LIST url. */
    public static final String API_FOLDER_FILE_LIST     = ROOT + "/list";
    /** DELETE Folder File url. */
    public static final String API_FOLDER_FILE_DELETE   = ROOT + "/delete";

    /** FolderService. */
    @Autowired
    private FolderService folderservice;

    /** SpringSecurityService. */
    @Autowired
    private SpringSecurityService securityService;

    /**
     * Deletes a Folder File.
     * @param request {@link HttpServletRequest}
     * @param folder {@link String}
     * @param parentuuid {@link String}
     * @param uuid {@link String}
     * @return {@link ApiMessageResponse}
     */
    @ApiOperation(value = "delete", nickname = "Folder File Delete")
    @ApiResponses(value = {
            @ApiResponse(code = SC_OK, message = "Success",
                    response = ApiMessageResponse.class),
            @ApiResponse(code = SC_UNAUTHORIZED, message = "Unauthorized"),
            @ApiResponse(code = SC_FORBIDDEN, message = "Forbidden"),
            @ApiResponse(code = SC_NOT_FOUND, message = "Not Found"),
            @ApiResponse(code = SC_INTERNAL_SERVER_ERROR,
                    message = "Failure") })
    @Transactional
    @RequestMapping(value = API_FOLDER_FILE_DELETE, method = POST)
    public ApiMessageResponse delete(
            final HttpServletRequest request,
            @RequestParam(value = "folder", required = true)
            final String folder,
            @RequestParam(value = "parent_uuid", required = false)
            final String parentuuid,
            @RequestParam(value = "uuid", required = false)
            final String uuid) {

        getApiVersion(request);

        UserDetails user = this.securityService.getUserDetails();

        if (!Strings.isEmpty(parentuuid)) {

            this.folderservice.deleteFolderFile(user, folder, parentuuid, true);

        } else if (!Strings.isEmpty(uuid)) {

            this.folderservice.deleteFolderFile(user, folder, uuid, false);

        } else {
            throw new PreconditionFailedException(
                    "'parent_uuid' or 'uuid' is required");
        }

        return new ApiMessageResponse("Deleted successful");
    }

    /**
     * Folder File List.
     * @param request {@link HttpServletRequest}
     * @return {@link FolderFormsListDTO}
     * @throws MissingServletRequestParameterException Exception
     */
    @ApiOperation(value = "list", nickname = "Folder File List")
    @ApiImplicitParams({
        @ApiImplicitParam(name = "folder", value = "Folder",
                required = true, dataType = "string", paramType = "query"),
        @ApiImplicitParam(name = "text", value = "Text to search for",
                required = false, dataType = "string", paramType = "query"),
        @ApiImplicitParam(name = "uuid",
                value = "UUID to look for records under",
                required = true, dataType = "string", paramType = "query"),
        @ApiImplicitParam(name = "token", value = "Paging token",
                required = false, dataType = "string", paramType = "query"),
      })
    @ApiResponses(value = {
            @ApiResponse(code = SC_OK, message = "Success",
                    response = FolderFormsListDTO.class),
            @ApiResponse(code = SC_UNAUTHORIZED, message = "Unauthorized"),
            @ApiResponse(code = SC_FORBIDDEN, message = "Forbidden"),
            @ApiResponse(code = SC_NOT_FOUND, message = "Not Found"),
            @ApiResponse(code = SC_INTERNAL_SERVER_ERROR,
                    message = "Failure") })
    @Transactional
    @RequestMapping(value = API_FOLDER_FILE_LIST, method = GET)
    public FolderFormsListDTO filelist(final HttpServletRequest request)
            throws MissingServletRequestParameterException {

        Map map = request.getParameterMap();

        String folder = getParameter(map, "folder", true);
        String text = getParameter(map, "text", false);
        String uuid = getParameter(map, "uuid", false);
        String token = getParameter(map, "token", false);

        List status = getParameters(map, "status",
                Arrays.asList(FolderFormStatus.ACTIVE, FolderFormStatus.DRAFT),
                FolderFormStatus.class);

        SortDirection dir = getParameter(map, "orderdir", SortDirection.ASC,
                SortDirection.class);

        FormOrderByField orderby = getParameter(map, "order",
                FormOrderByField.NAME, FormOrderByField.class);

        return this.folderservice.findForms(folder, uuid, text, orderby,
                dir, status, token);
    }

    /**
     * Gets a File.
     * @param request {@link HttpServletRequest}
     * @param response {@link HttpServletResponse}
     * @param folder {@link String}
     * @param uuid {@link String}
     * @throws IOException IOException
     */
    @ApiOperation(value = "get", nickname = "Folder File Get")
    @ApiResponses(value = {
            @ApiResponse(code = SC_OK, message = "Success"),
            @ApiResponse(code = SC_UNAUTHORIZED, message = "Unauthorized"),
            @ApiResponse(code = SC_FORBIDDEN, message = "Forbidden"),
            @ApiResponse(code = SC_NOT_FOUND, message = "Not Found"),
            @ApiResponse(code = SC_INTERNAL_SERVER_ERROR,
                    message = "Failure") })
    @Transactional
    @RequestMapping(value = API_FOLDER_FILE_GET, method = GET)
    public void get(
            final HttpServletRequest request,
            final HttpServletResponse response,
            @RequestParam(value = "folder", required = true)
            final String folder,
            @RequestParam(value = "uuid", required = true) final String uuid)
            throws IOException {

        getApiVersion(request);

        UserDetails user = this.securityService.getUserDetails();
        FormDTO dto = this.folderservice.findForm(user, folder, uuid);

        response.addHeader("sha1hash", dto.getSha1hash());
        response.setContentType("application/zip");
        response.setContentLengthLong(dto.getData().length);
        IOUtils.write(dto.getData(), response.getOutputStream());
    }

    /**
     * Save File to Folder.
     * @param request {@link HttpServletRequest}
     * @param response {@link HttpServletResponse}
     * @param folder {@link String}
     * @param entity HttpEntity<byte[]>
     * @param lastSha1hash {@link String}
     * @return {@link ApiMessageResponse}
     * @throws IOException IOException
     */
    @ApiOperation(value = "save", nickname = "Folder File Save")
    @ApiResponses(value = {
            @ApiResponse(code = SC_OK, message = "Success",
                    response = ApiMessageResponse.class),
            @ApiResponse(code = SC_UNAUTHORIZED, message = "Unauthorized"),
            @ApiResponse(code = SC_FORBIDDEN, message = "Forbidden"),
            @ApiResponse(code = SC_NOT_FOUND, message = "Not Found"),
            @ApiResponse(code = SC_INTERNAL_SERVER_ERROR,
                    message = "Failure") })
    @Transactional
    @RequestMapping(value = API_FOLDER_FILE_SAVE, method = POST)
    public ApiMessageResponse saveFolderFile(
            final HttpServletRequest request,
            final HttpServletResponse response,
            @RequestParam(value = "folder", required = true)
            final String folder,
            @RequestParam(value = "sha1hash", required = false)
            final String lastSha1hash,
            final HttpEntity entity)
            throws IOException {

        getApiVersion(request);

        ApiMessageResponse msg = new ApiMessageResponse("Save successful");

        if (request instanceof MultipartHttpServletRequest) {

            MultipartHttpServletRequest rr =
                    (MultipartHttpServletRequest) request;

            Iterator itr =  rr.getFileNames();
            MultipartFile mpf = rr.getFile(itr.next());
            String sha1hash = this.folderservice.saveForm(folder,
                    mpf.getBytes(), lastSha1hash);
            response.addHeader("sha1hash", sha1hash);

        } else {

            String sha1hash = this.folderservice.saveForm(folder,
                    entity.getBody(), lastSha1hash);
            response.addHeader("sha1hash", sha1hash);
        }

        return msg;
    }
}




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