@riturajgc/upload-manager-service/src/functions/utils.js

Upload manager service for bitnudge

const sharp = require('sharp');
const md5File = require('md5-file');
const _ = require('lodash');

const { errorObject } = require("./../lib/utils/index.js");

const createThumbnail = async(model,document,fileName,filePath,size) => {
    try{
        if(!filePath || !size){
            return {status:false,message:"Please provide valid fields"};
        }
        return sharp(filePath).rotate().resize(size).toBuffer().then( thumbnailData => {
            saveData(model,document,fileName,thumbnailData); 
        }).catch( err => {
            console.error("Error in createThumbnail",err);
        });
    }catch(err){
        console.error("Error in createThumbnail",err);
    }
};

const saveData = async(model,document,fileName,thumbnailData) => {
    const result = await model.update({
        _id:document._id
    },{
        $set:{
            thumbnail:{
                name:fileName,
                content:thumbnailData,
            },
            isThumbnailAvailable:true
        }  
    })
}

const createHash = async(filePath) => {
    if(!filePath){
        return errorObject({message:"Please provide valid fields"});
    }
    const hash = md5File.sync(filePath);
    return {status:true,data:hash};
};

const getInBytes = (size) => {
  let sizeInBytes = 0;
  const mult = 1024;
  if(size && size.toLowerCase().endsWith('kb')){
    sizeInBytes = parseFloat(size.replace('kb','')) * mult;
  }else if(size && size.toLowerCase().endsWith('mb')) {
    sizeInBytes = parseFloat(size.replace('mb', '')) * mult * mult;
  }
  return sizeInBytes;
};

const isValidImage = (imageParameter, thresholds) => {
    let message = "";
    let threshold = thresholds.find((threshold) => {
        return threshold.fileType.includes(imageParameter.type.toString());
    });
    if(imageParameter.height < threshold.validation.minHeight){
        message = `${threshold.errorMessages.errMsgMinHeight}`;
    }
    if(imageParameter.height > threshold.validation.maxHeight){
        message += `${message?', ':''}${threshold.errorMessages.errMsgMaxHeight}`;
    }
    if(imageParameter.width < threshold.validation.minWidth){
        message += `${message?', ':''}${threshold.errorMessages.errMsgMinWidth}`;
    }
    if(imageParameter.width > threshold.validation.maxWidth){
      message += `${message?', ':''}${threshold.errorMessages.errMsgMaxWidth}`;
    }

    const minSize = getInBytes(threshold.validation.minSize);
    const maxSize = getInBytes(threshold.validation.maxSize);
    if(imageParameter.size < minSize){
        message += `${message?', ':''}${threshold.errorMessages.errMsgMinSize}`;
    }
    if(imageParameter.size > maxSize){
        message += `${message?', ':''}${threshold.errorMessages.errMsgMaxSize}`;
    }
    if(message){
        return errorObject({ message });
    }
    return {status:true};
};

const isValidFileSize = ({size,fileType, thresholds}) => {
    let message = "";
    const threshold = thresholds.find((threshold) => {
        return threshold.fileType.includes(fileType.toString());
    });
    const minSize = getInBytes(threshold.validation.minSize);
    const maxSize = getInBytes(threshold.validation.maxSize);
    if(size < minSize){
        message += `${message?', ':''}${threshold.errorMessages.errMsgMinSize}`;
    }
    if(size > maxSize){
        message += `${message?', ':''}${threshold.errorMessages.errMsgMaxSize}`;
    }
    if(message){
        return errorObject({ message });
    }
    return {status:true};
}

module.exports = {
    createThumbnail,
    createHash,
    isValidImage,
    isValidFileSize
};