pdf2pic/dist/index.js

A utility for converting pdf to image formats. Supports different outputs: directly to file, base64 or buffer.

"use strict";var e=require("gm"),t=require("path"),s=require("fs"),i=require("stream");const r={quality:0,format:"png",width:768,height:512,density:72,preserveAspectRatio:!1,savePath:"./",saveFilename:"untitled",compression:"jpeg",units:"PixelsPerInch"};function n(e,t,s,i){return new(s||(s=Promise))((function(r,n){function a(e){try{h(i.next(e))}catch(e){n(e)}}function o(e){try{h(i.throw(e))}catch(e){n(e)}}function h(e){var t;e.done?r(e.value):(t=e.value,t instanceof s?t:new s((function(e){e(t)}))).then(a,o)}h((i=i.apply(e,t||[])).next())}))}"function"==typeof SuppressedError&&SuppressedError;class a{constructor(){this.quality=0,this.format="png",this.width=768,this.height=512,this.preserveAspectRatio=!1,this.density=72,this.savePath="./",this.saveFilename="untitled",this.compression="jpeg",this.units="PixelsPerInch",this.gm=e.subClass({imageMagick:!1})}generateValidFilename(e){let s=t.join(this.savePath,this.saveFilename);return this.savePath.startsWith("./")&&(s=`./${s}`),"number"==typeof e&&(s=`${s}.${e+1}`),`${s}.${this.format}`}gmBaseCommand(e,t){return this.gm(e,t).density(this.density,this.density).units(this.units).resize(this.width,this.height,this.preserveAspectRatio?"^":"!").quality(this.quality).compress(this.compression)}toBase64(e,t){return n(this,void 0,void 0,(function*(){const{buffer:s,size:i,page:r}=yield this.toBuffer(e,t);return{base64:s.toString("base64"),size:i,page:r}}))}toBuffer(e,t){const s=`${e.path}[${t}]`;return new Promise(((i,r)=>{this.gmBaseCommand(e,s).stream(this.format,((e,s)=>{const n=[];if(e)return r(e);s.on("data",(e=>{n.push(e)})).on("end",(()=>i({buffer:Buffer.concat(n),size:`${this.width}x${this.height}`,page:t+1})))}))}))}writeImage(e,i){const r=this.generateValidFilename(i),n=`${e.path}[${i}]`;return new Promise(((a,o)=>{this.gmBaseCommand(e,n).write(r,(e=>e?o(e):a({name:t.basename(r),size:`${this.width}x${this.height}`,fileSize:s.statSync(r).size/1e3,path:r,page:i+1})))}))}identify(e,t){const s=this.gm(e);return new Promise(((e,i)=>{t?s.identify(t,((t,s)=>t?i(t):e(s.replace(/^[\w\W]*?1/,"1")))):s.identify(((t,s)=>t?i(t):e(s)))}))}setQuality(e){return this.quality=e,this}setFormat(e){return this.format=e,this}setSize(e,t){return this.width=e,this.height=this.preserveAspectRatio||t?t:e,this}setPreserveAspectRatio(e){return this.preserveAspectRatio=e,this}setDensity(e){return this.density=e,this}setSavePath(e){return this.savePath=e,this}setSaveFilename(e){return this.saveFilename=e,this}setUnits(e){return this.units=e,this}setCompression(e){return this.compression=e,this}setGMClass(t){return"boolean"==typeof t?(this.gm=e.subClass({imageMagick:t}),this):"imagemagick"===t.toLocaleLowerCase()?(this.gm=e.subClass({imageMagick:!0}),this):(this.gm=e.subClass({appPath:t}),this)}getOptions(){return{quality:this.quality,format:this.format,width:this.width,height:this.height,preserveAspectRatio:this.preserveAspectRatio,density:this.density,savePath:this.savePath,saveFilename:this.saveFilename,compression:this.compression,units:this.units}}}function o(e){return new i.Readable({read(){this.push(e),this.push(null)}})}function h(e,t){if("buffer"===e)return o(t);if("path"===e)return s.createReadStream(t);if("base64"===e)return i=t,o(Buffer.from(i,"base64"));var i;throw new Error("Cannot recognize specified source")}function u(e,t,i=r){const u=new a;i=Object.assign(Object.assign({},r),i);const c=(e,t,s)=>{if(t<1)throw new Error("Page number should be more than or equal 1");const i=(e=>{var t;if(e&&"object"!=typeof e)throw new Error(`Invalid convertOptions type: ${e}`);return null!==(t=null==e?void 0:e.responseType)&&void 0!==t?t:"image"})(s);switch(i){case"base64":return u.toBase64(e,t-1);case"image":return u.writeImage(e,t-1);case"buffer":return u.toBuffer(e,t-1);default:throw new Error(`Invalid responseType: ${i}`)}},f=(e,t,s)=>Promise.all(t.map((t=>c(e,t,s)))),p=(s=1,i)=>{const r=h(e,t);return c(r,s,i)};return p.bulk=(i,r)=>n(this,void 0,void 0,(function*(){const a=yield function(e,t){return n(this,void 0,void 0,(function*(){if("buffer"===e)return t;if("path"===e)return yield s.promises.readFile(t);if("base64"===e)return Buffer.from(t,"base64");throw new Error("Cannot recognize specified source")}))}(e,t),h=-1===i?yield function(e,t){return n(this,void 0,void 0,(function*(){return(yield e.identify(t,"%p ")).split(" ").map((e=>parseInt(e,10)))}))}(u,o(a)):Array.isArray(i)?i:[i],c=[];for(let e=0;e<h.length;e+=10)c.push(...yield f(o(a),h.slice(e,e+10),r));return c})),p.setOptions=()=>function(e,t){return void e.setQuality(t.quality).setFormat(t.format).setPreserveAspectRatio(t.preserveAspectRatio).setSize(t.width,t.height).setDensity(t.density).setSavePath(t.savePath).setSaveFilename(t.saveFilename).setCompression(t.compression).setUnits(t.units)}(u,i),p.setGMClass=e=>{u.setGMClass(e)},p.setOptions(),p}exports.fromBase64=function(e,t=r){return u("base64",e,t)},exports.fromBuffer=function(e,t=r){return u("buffer",e,t)},exports.fromPath=function(e,t=r){return u("path",e,t)};