salix/back/methods/docuware/download.js

const got = require('got');
const fs = require('fs-extra');
const path = require('path');
const UserError = require('vn-loopback/util/user-error');
const {promisify} = require('util');
const nodeStream = require('stream');

module.exports = Self => {
    Self.remoteMethodCtx('download', {
        description: 'Download an docuware PDF',
        accessType: 'READ',
        accepts: [
            {
                arg: 'id',
                type: 'number',
                description: 'The ticket id',
                http: {source: 'path'}
            }
        ],
        returns: [
            {
                arg: 'body',
                type: 'file',
                root: true
            }, {
                arg: 'Content-Type',
                type: 'String',
                http: {target: 'header'}
            }, {
                arg: 'Content-Disposition',
                type: 'String',
                http: {target: 'header'}
            }
        ],
        http: {
            path: `/:id/download`,
            verb: 'GET'
        }
    });

    Self.download = async function(ctx, id) {
        // const fileCabinet = 'ad2c49df-8976-4941-bb19-9b30685f14a4';
        // hay que crear tambien una busqueda por cada fileCabinet
        // columnas necesarias. seccion, fileCabinet, DBName, dialog
        /* const myUserId = ctx.req.accessToken.userId;
        if (!myUserId)
            throw new UserError(`You don't have enough privileges`);*/

        const models = Self.app.models;
        const docuwareConfig = await models.DocuwareConfig.findOne();
        const docuwareInfo = await models.Docuware.findOne({
            where: {
                name: 'deliveryClient',
                dialogName: 'findTicket'
            }
        });

        const docuwareUrl = docuwareConfig.url;
        const cookie = docuwareConfig.token;
        const fileCabinetName = docuwareInfo.fileCabinetName;
        const find = docuwareInfo.find;

        const options = {
            'headers': {
                'Accept': 'application/json',
                'Content-Type': 'application/json',
                'Cookie': cookie
            }
        };
        // get fileCabinetId
        const fileCabinetResponse = await got.get(`${docuwareUrl}/FileCabinets`, options).json();
        const fileCabinetId = fileCabinetResponse.FileCabinet.find(dialogs => dialogs.Name === fileCabinetName).Id;

        // get dialog
        const dialogResponse = await got.get(`${docuwareUrl}/FileCabinets/${fileCabinetId}/dialogs`, options).json();
        const dialogId = dialogResponse.Dialog.find(dialogs => dialogs.DisplayName === 'find').Id;

        // get docuwareID
        const docuwareOptions = {
            'headers': {
                'Accept': 'application/json',
                'Content-Type': 'application/json',
                'Cookie': cookie
            },
            'body': JSON.stringify({'Condition': [{DBName: find, Value: [0]}]})
        };
        const response = await got.post(
            `${docuwareUrl}/FileCabinets/${fileCabinetId}/Query/DialogExpression?dialogId=${dialogId}`,
            docuwareOptions
        );
        const docuwareId = JSON.parse(response.body).Items[0].Id;

        // download file
        const downloadUrl = `${docuwareUrl}/FileCabinets/${fileCabinetId}/Documents/${docuwareId}/FileDownload?targetFileType=Auto&keepAnnotations=false`;
        const downloadOptions = {
            'headers': {
                'Cookie': cookie
            }
        };

        try {
            // save file
            const ticket = await models.Ticket.findById(id);

            const shipped = ticket.shipped;
            const year = shipped.getFullYear().toString();
            const month = (shipped.getMonth() + 1).toString();
            const day = shipped.getDate().toString();
            const fileName = `${year}${id}.pdf`;

            const container = await models.DocuwareContainer.container(year);
            const rootPath = container.client.root;
            const src = path.join(rootPath, year, month, day);
            const fileSrc = path.join(src, fileName);

            await fs.mkdir(src, {recursive: true});

            const pipeline = promisify(nodeStream.pipeline);
            await pipeline(
                got.stream(downloadUrl, downloadOptions),
                fs.createWriteStream(fileSrc)
            );

            // open file
            const file = {
                path: fileSrc,
                contentType: 'application/pdf',
                name: fileName
            };

            await fs.access(file.path);
            let stream = fs.createReadStream(file.path);

            return [stream, file.contentType, `filename="${file.name}"`];
        } catch (error) {
            if (error.code === 'ENOENT')
                throw new UserError('The DOCUWARE PDF document does not exists');

            throw error;
        }
    };
};