kato
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kato.cafe
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PDF -> PNG Convertor 

* DockerFile Addditions
+ Helper Functions
This commit is contained in:
Daniel Legt 2022-05-10 02:32:55 +03:00
parent 31292b0d17
commit 7306bf607a
9 changed files with 608 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
Dockerfile
View File

@ -1,5 +1,7 @@
FROM node:18-buster FROM node:18-buster
ENV DEBIAN_FRONTEND=noninteractive
# Create app directory # Create app directory
WORKDIR /app WORKDIR /app
@ -9,5 +11,11 @@ COPY . .
# Install Requirements and build the app # Install Requirements and build the app
RUN npm install && npm run build; RUN npm install && npm run build;
# Install required dependencies
RUN apt update && apt install -y \
poppler-utils poppler-data \
&& rm -rf /var/lib/apt/lists/*
EXPOSE 5386 EXPOSE 5386
CMD [ "npm", "run", "start" ] CMD [ "npm", "run", "start" ]

451
package-lock.json generated
View File

@ -6,10 +6,14 @@
"": { "": {
"dependencies": { "dependencies": {
"@types/express": "^4.17.13", "@types/express": "^4.17.13",
"@types/express-handlebars": "^6.0.0", "@types/mmmagic": "^0.4.30",
"@types/multer": "^1.4.7",
"dotenv": "^16.0.0", "dotenv": "^16.0.0",
"express": "^4.18.1", "express": "^4.18.1",
"express-handlebars": "^6.0.5", "express-handlebars": "^6.0.5",
"mmmagic": "^0.5.3",
"multer": "^1.4.4",
"node-poppler": "^5.1.4",
"ts-node": "^10.7.0", "ts-node": "^10.7.0",
"typescript": "^4.6.4" "typescript": "^4.6.4"
}, },
@ -84,15 +88,6 @@
"@types/serve-static": "*" "@types/serve-static": "*"
} }
}, },
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"deprecated": "This is a stub types definition. express-handlebars provides its own type definitions, so you do not need this installed.",
"dependencies": {
"express-handlebars": "*"
}
},
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@ -108,6 +103,22 @@
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@ -188,6 +199,11 @@
"node": ">= 8" "node": ">= 8"
} }
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@ -260,8 +276,19 @@
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"dev": true },
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"integrity": "sha1-bCpiLvz0fFe7vh4qnDetNseSVFM=",
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"node_modules/bytes": { "node_modules/bytes": {
"version": "3.1.2", "version": "3.1.2",
@ -283,6 +310,17 @@
"url": "https://github.com/sponsors/ljharb" "url": "https://github.com/sponsors/ljharb"
} }
}, },
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"engines": {
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},
"funding": {
"url": "https://github.com/sponsors/sindresorhus"
}
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"dependencies": {
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@ -348,6 +432,11 @@
"resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz", "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
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@ -378,6 +467,18 @@
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} }
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@ -962,6 +1134,11 @@
"url": "https://github.com/sponsors/jonschlinkert" "url": "https://github.com/sponsors/jonschlinkert"
} }
}, },
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"integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==", "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ=="
"dev": true
}, },
"yn": { "yn": {
"version": "3.1.1", "version": "3.1.1",

7
package.json
View File

@ -1,7 +1,7 @@
{ {
"scripts": { "scripts": {
"start": "node ./dist/app.js", "start": "node ./dist/app.js",
"test": "cd src && ts-node-dev --respawn app.ts", "test": "ts-node-dev --respawn src/app.ts",
"build": "tsc" "build": "tsc"
}, },
"devDependencies": { "devDependencies": {
@ -9,9 +9,14 @@
}, },
"dependencies": { "dependencies": {
"@types/express": "^4.17.13", "@types/express": "^4.17.13",
"@types/mmmagic": "^0.4.30",
"@types/multer": "^1.4.7",
"dotenv": "^16.0.0", "dotenv": "^16.0.0",
"express": "^4.18.1", "express": "^4.18.1",
"express-handlebars": "^6.0.5", "express-handlebars": "^6.0.5",
"mmmagic": "^0.5.3",
"multer": "^1.4.4",
"node-poppler": "^5.1.4",
"ts-node": "^10.7.0", "ts-node": "^10.7.0",
"typescript": "^4.6.4" "typescript": "^4.6.4"
} }

86
src/Controllers/Convert.ts Normal file
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@ -0,0 +1,86 @@
import { Request, Response, NextFunction, Router } from 'express';
import { Magic, MAGIC_MIME_TYPE } from 'mmmagic';
import { findFile, returnError } from '../Helpers/ApiHelper';
import { convertFileToPNG } from '../Models/ConversionModel';
const magic = new Magic(MAGIC_MIME_TYPE);
const convertController = async (req: Request, res: Response, next: NextFunction) => {
// Check if any files were sent over.
if ( !req.files || req.files?.length <= 0 ) {
return returnError(res, {
"message": "No files have been provided, this api endpoint requres files to be able to process them",
"error": "Empty files array"
})
}
// Get our file
const inputFile = findFile('inputFile', req.files as Express.Multer.File[]);
// Check if we have an input File
if ( inputFile == null ) {
return returnError(res, {
"message": "Broken file name in request, please try again.",
"error": "Files are in the call, but we require the name inputFile to be sent over."
})
}
let inputFileType: string | null = null;
// Get the input file format
await new Promise<string | string[]>((_r, _e) => {
magic.detectFile(inputFile.path, (err, fileType) => {
if ( err ) {
return _e(err);
} else {
return _r(fileType);
}
})
})
.then( ftype => {
console.log(ftype);
if ( typeof ftype != 'object' ) {
inputFileType = ftype;
} else {
inputFileType = ftype[0];
}
})
.catch( err => {
console.error(err);
})
if ( !!!inputFileType ) {
return returnError(res, {
message: "Could not determine a valid input file type",
error: "Could not determine a valid input file type",
})
}
// Check if we have the target Format
const targetFormat = req.body.targetFormat
// Predefine the result
let result: string | null = null;
// Check for the input/output formats
if ( targetFormat == 'png' && inputFileType == 'application/pdf' ) {
await convertFileToPNG(inputFile)
.then( data => {
result = data.toString(`base64`);
})
.catch( err => {
console.error(err);
})
}
res.status(200).send({
message: `Conversion completed`,
result: result,
});
}
export { convertController }

2
src/Controllers/Homepage.ts
View File

@ -1,6 +1,6 @@
import { Request, Response, NextFunction, Router } from 'express'; import { Request, Response, NextFunction, Router } from 'express';
const homepageController = ( req:Request, res:Response, next:NextFunction ) => { const homepageController = ( req: Request, res: Response, next: NextFunction ) => {
// Make sure that the browser isn't caching this // Make sure that the browser isn't caching this
res.setHeader(`Cache-Control`, `no-cache, must-revalidate`); res.setHeader(`Cache-Control`, `no-cache, must-revalidate`);

19
src/Helpers/ApiHelper.ts Normal file
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@ -0,0 +1,19 @@
import { Response } from "express";
export function returnError(res: Response, content: any, status: number = 400) {
res.status(status).send(content);
}
export function findFile(fieldName: string, fileList: Express.Multer.File[]): Express.Multer.File | null {
// Go through all files
for ( let file of fileList ) {
// Check if the field name matches
if ( file.fieldname == fieldName) {
// Return the found file
return file;
}
}
return null;
}

36
src/Models/ConversionModel.ts Normal file
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@ -0,0 +1,36 @@
import { Poppler } from "node-poppler";
import fs from "fs/promises";
export function convertFileToPNG(file: Express.Multer.File): Promise<Buffer> {
return new Promise<Buffer>((_r, _e) => {
console.log(file);
// Read the file
fs.readFile(file.path)
.then( fileBuffer => {
let p = new Poppler(`/usr/bin`);
p.pdfToCairo(fileBuffer, undefined, {
pngFile: true,
singleFile: true,
})
.then( buff => {
if ( buff instanceof Error ) {
return _e(buff);
}
_r(Buffer.from(buff));
})
.catch(err => {
_e(err);
})
})
.catch( err => {
return _e(err);
})
})
}

23
src/Routes/Api.ts Normal file
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@ -0,0 +1,23 @@
// Imports
import express from 'express';
import multer from 'multer';
import { convertController } from '../Controllers/Convert';
const upload = multer({ dest: '/tmp' });
// Get the router
const router = express.Router();
router.get(`/`, (req, res, next) => {
res.status(200).send({
status: "Healthy",
healthStatus: "100%",
version: "1.0.0",
});
})
// Set the route
router.post("/convert", upload.any(), convertController);
// Export the reouter
export {router as apiRouter};

3
src/app.ts
View File

@ -4,6 +4,7 @@ import express from 'express';
import config from './Config/config'; import config from './Config/config';
import { engine } from 'express-handlebars'; import { engine } from 'express-handlebars';
import { homepageRouter } from './Routes/Homepage'; import { homepageRouter } from './Routes/Homepage';
import { apiRouter } from './Routes/Api';
//#endregion //#endregion
@ -58,6 +59,8 @@ router.use((req, res, next) => {
router.use(`/public`, express.static('./src/public/')); router.use(`/public`, express.static('./src/public/'));
// Handle the homepage // Handle the homepage
router.use("/api", apiRouter);
router.get("/", homepageRouter); router.get("/", homepageRouter);
{ // Error handling { // Error handling