opt-cc/api/signature-tool/signature-tool.js

"use strict";

// modules used for graphic manipulation
const jimp = require('jimp');
const imagemin = require('imagemin');
const imageminpngquant = require('imagemin-pngquant');
const SHA1 = require('node-sha1');
const async = require('async');

// Mongoose Model using mongoDB
const UserModel = require('../models/user');
const AwardingModel = require('../models/awarding');
const RankModel = require('../models/rank');

// http error code table
const codes = require('../routes/http-codes');

// standard input/output file extension
const fileExt = '.png';
const resourceDir = __dirname + '/../resource/';


let createSignature = (userId, res, next) => {

  let loadedImage;
  let user;

  if (!String(userId).match(/^[0-9a-fA-F]{24}$/)) {
    let error = new Error('no valid ID ' + userId);
    error.status = codes.wrongdatatyperequest;
    return next(error);
  }
  UserModel.findById(userId, ['username', 'rankLvl', 'squadId'])
    .populate('squadId', ['name', 'fraction'])
    .exec()
    .then((resUser) => {
      user = resUser;
      let platePath;
      if (resUser && resUser.squadId && resUser.squadId.fraction === 'BLUFOR') {
        platePath = __dirname + '/backplate/blufor' + fileExt;
      } else if (resUser && resUser.squadId && resUser.squadId.fraction === 'OPFOR') {
        platePath = __dirname + '/backplate/opfor' + fileExt;
      }

      // kill process on undefined platePath
      if (!platePath) {
        throw new Error('Fraction not defined for user with id ' + userId);
      }
      return jimp.read(platePath)
    })
    .then((image) => {
      loadedImage = image;
    }).then(() => {
    return jimp.loadFont(__dirname + '/font/DEVAJU_SANS_19.fnt');
  })
    .then((font) => {
      loadedImage.print(font, 128, 8, user.username)
    })
    .then(() => {
      return jimp.loadFont(__dirname + '/font/DEJAVU_SANS_13.fnt');
    })
    .then((font) => {
      loadedImage.print(font, 128, 35, user.squadId.name);
      return font;
    })
    .then((font) => {
      let rankH, rankW, rankX, rankY;

      RankModel.findOne({'level': user.rankLvl, 'fraction': user.squadId.fraction}, (err, result) => {
        if (err) {
          return next(err)
        }

        if (result) {
          if (user.squadId.fraction === 'BLUFOR') {
            rankW = 25;
            rankH = 60;
            rankX = 36;
            rankY = 34;
          } else {
            rankW = 37;
            rankH = 58;
            rankX = 30;
            rankY = 34;
          }

          jimp.read(resourceDir + 'rank/' + result._id + fileExt)
            .then((rankImage) => {
              rankImage.resize(rankW, rankH);
              loadedImage
                .print(font, 128, 55, result.name)
                .composite(rankImage, rankX, rankY)
            })
            .then(() => {
              addDecorationsAndSave(userId, loadedImage, res, next);
            })
        } else {
          // user has not any assignable rank in his fraction at this point,
          // e.g. assigned rank has been deleted or switched fraction so rankLvl is not defined
          addDecorationsAndSave(userId, loadedImage, res, next);
        }
      })
    })
    .catch((err) => {
      next(err);
    })
};


/**
 * query decorations according to user id and
 * add all graphics into given image
 *
 * @param userId
 * @param loadedImage - background image
 * @param res
 * @param next
 */
let addDecorationsAndSave = (userId, loadedImage, res, next) => {
  const medalW = 21;
  const medalH = 40;
  const ribbonW = 53;
  const ribbonH = 15;
  let medalPx = 630;
  let medalPy = 5;
  let ribbonPx = 598;
  let ribbonPy = 95;

  AwardingModel.find({
    'userId': userId,
    'confirmed': 1
  }, ['decorationId', 'date']).populate('decorationId', ['isMedal', 'fraction'])
    .exec((err, awardings) => {
        if (err) {
          return next(err);
        }
        if (awardings.length > 0) {

          //TODO: simplify this sorting hell
          awardings.sort((a1, a2) => {
            if (!a1.decorationId.isMedal && !a2.decorationId.isMedal) {
              if (a1.decorationId.fraction === a2.decorationId.fraction) {
                if (a1.date !== a2.date) {
                  if (a1.date < a2.date) {
                    return -1;
                  }
                  if (a1.date > a2.date) {
                    return 1;
                  }
                }
                return 0;
              } else {
                if (a1.decorationId.fraction === 'GLOBAL' && a2.decorationId.fraction !== 'GLOBAL') {
                  return -1;
                }
                if (a2.decorationId.fraction === 'GLOBAL' && a1.decorationId.fraction !== 'GLOBAL') {
                  return 1;
                }
              }
            }
            if (a1.decorationId.isMedal !== a2.decorationId.isMedal) {
              if (a1.decorationId.isMedal && !a2.decorationId.isMedal) {
                return 1;
              }
              if (!a1.decorationId.isMedal && a2.decorationId.isMedal) {
                return -1;
              }
            }
            if (a1.decorationId.isMedal && a2.decorationId.isMedal) {
              if (a1.date !== a2.date) {
                if (a1.date < a2.date) {
                  return -1;
                }
                if (a1.date > a2.date) {
                  return 1;
                }
              }
              return 0;
            }
          });

          // use synchronized call to keep correct order of decorations
          async.eachSeries(awardings, (award, callback) => {
            jimp.read(resourceDir + 'decoration/' + award.decorationId._id + fileExt).then((decorationImage) => {
              if (award.decorationId.isMedal) {
                decorationImage.resize(medalW, medalH);
                loadedImage.composite(decorationImage, medalPx, medalPy);
                if (medalPy === 5) {
                  medalPx = medalPx - 1 - medalW;
                } else {
                  medalPx = medalPx + 1 + medalW;
                }
                if (medalPx <= 300) {
                  medalPy = medalPy + 3 + medalH;
                }
              } else {
                decorationImage.resize(ribbonW, ribbonH);
                loadedImage.composite(decorationImage, ribbonPx, ribbonPy);
                ribbonPx = ribbonPx - 2 - ribbonW;
                if (ribbonPx <= 154) {
                  ribbonPy = ribbonPy - 3 - ribbonH;
                  ribbonPx = 598;
                }
              }
              callback();
            })
          }, (err) => {
            if (err) {
              throw err;
            }
            compareImagesAndSave(loadedImage, userId, res, next);
          });
        } else {
          compareImagesAndSave(loadedImage, userId, res, next);
        }
      }
    )
};

let compareImagesAndSave = (generatedImage, userId, res, next) => {

  return jimp.read(resourceDir + 'signature/big/' + userId + fileExt)
    .then((oldImage) => {
      // compare hashes of image map to recognize difference
      const sig1 = SHA1(generatedImage.bitmap.data);
      const sig2 = SHA1(oldImage.bitmap.data);
      if (sig1 !== sig2) {
        saveJimpImageAndCompress(generatedImage, userId, res, next)
      } else {
        res.locals.items = {status: 'nothing to do'};
        next();
      }
    })
    .catch((err) => {
      saveJimpImageAndCompress(generatedImage, userId, res, next);
    })

};

/**
 *
 * Write Jimp image to file system
 * Gets minified after 3 seconds timeout
 *
 * @param image - Jimp image
 * @param userId - user id of signature owner
 * @param res - express response object
 * @param next - express next-function
 */
let saveJimpImageAndCompress = (image, userId, res, next) => {
  image.write(resourceDir + 'signature/big/' + userId + fileExt);
  setTimeout(() => {
    imagemin([resourceDir + 'signature/big/' + userId + fileExt], resourceDir + 'signature/', {
      plugins: [
        imageminpngquant({quality: '65-80'})
      ]
    }).then((files) => {
      res.locals.items = {status: 'success'};
      return next();
    }).catch((error) => {
      console.log(error)
    })
  }, 3000);
};


module.exports = createSignature;