backend: Première route /functions/:functionName + Gestion des erreurs 404 et 500

README.md

@@ -8,7 +8,5 @@
 
 Le projet est disponible sur [function.divlo.fr](https://function.divlo.fr/).
 
-[![FunctionProject](./img/FunctionProject.png)](https://function.divlo.fr/)
-
 ## Licence 
 Ce projet est sous licence MIT - voir le fichier [LICENSE](./LICENSE) pour plus de détails.

backend/app.js

@@ -1,19 +1,27 @@
 /* Modules */
-const express  = require('express');
-const cors     = require('cors');
-const morgan   = require('morgan');
+const express = require('express');
+const helmet  = require('helmet');
+const cors    = require('cors');
+const morgan  = require('morgan');
 
 /* Files Imports & Variables */
-const { PORT } = require('./assets/config/config');
-const app      = express();
+const { PORT }        = require('./assets/config/config');
+const { serverError } = require('./assets/config/errors');
+const sendResponse    = require('./assets/utils/sendResponse');
+const app             = express();
 
 /* Middlewares */
+app.use(helmet());
 app.use(cors());
 app.use(morgan('dev'));
 app.use(express.json());
 
 /* Routes */ 
-app.get('/', (_req, res) => res.send('Hello world!'));
+app.use('/functions', require('./routes/functions'));
+
+/* Errors Handling */
+app.use((_req, res, _next) => sendResponse(res, { result: "La route n'existe pas!", httpStatus: 404 })); // 404
+app.use((error, _req, res, _next) => { console.log(error); return sendResponse(res, serverError); }); // 500
 
 /* Server */
 app.listen(PORT, () => console.log('\x1b[36m%s\x1b[0m', `Started on port ${PORT}.`));

backend/assets/config/config.js

@@ -1,3 +1,5 @@
-module.exports = {
+const config = {
     PORT: process.env.PORT || 8080
 };
+
+module.exports = config;

backend/assets/config/errors.js

@@ -0,0 +1,18 @@
+const errors = {
+    generalError: {
+        result: "Vous n'avez pas rentré de valeur valide.",
+        httpStatus: 400
+    },
+
+    serverError: {
+        result: "Le serveur n'a pas pu traiter votre requête.",
+        httpStatus: 500
+    },
+
+    requiredFields: {
+        result: "Vous devez remplir tous les champs...",
+        httpStatus: 400
+    }
+};
+
+module.exports = errors;

backend/assets/functions/functionObject.js

@@ -0,0 +1,24 @@
+const { randomNumberOutput }                                     = require('./main/randomNumber');
+const { convertArabicToRomanOutput, convertRomanToArabicOutput } = require('./main/convertRomanArabicNumbers');
+
+const functionObject = {
+    randomNumber: {
+        functionOutput: randomNumberOutput,
+        args:  ["min", "max"]
+    },
+    convertArabicToRoman: {
+        functionOutput: convertArabicToRomanOutput,
+        args: ["number"]
+    },
+    convertRomanToArabic: {
+        functionOutput: convertRomanToArabicOutput,
+        args: ["romanNumber"]
+    }
+};
+
+// Choisi la fonction à exécuter
+function functionToExecute(option) {
+    return functionObject[option];
+}
+
+module.exports = functionToExecute;

backend/assets/functions/main/convertRomanArabicNumbers.js

@@ -0,0 +1,109 @@
+const sendResponse                     = require('../../utils/sendResponse');
+const { requiredFields, generalError } = require('../../config/errors');
+
+/* Variable pour convertRomanArabicNumbers */
+const correspondancesRomainArabe = [
+    [1000, "M"],
+    [900, "CM"],
+    [500, "D"],
+    [400, "CD"],
+    [100, "C"],
+    [90, "XC"],
+    [50, "L"],
+    [40, "XL"],
+    [10, "X"],
+    [9, "IX"],
+    [5, "V"],
+    [4, "IV"],
+    [1, "I"],
+];
+
+/** 
+ * @description Convertis un nombre arabe en nombre romain.
+ * @requires {@link correspondancesRomainArabe}
+ * @param {Number} nombre - Le nombre arabe à convertir
+ * @returns {String}
+ * @examples convertArabicToRoman(24) → 'XXIV'
+ */
+function convertArabicToRoman(nombre) {
+    // Initialisation de la variable qui va contenir le résultat de la conversion
+    let chiffresRomains = "";
+
+    function extraireChiffreRomain(valeurLettre, lettres) {
+        while (nombre >= valeurLettre) {
+            chiffresRomains = chiffresRomains + lettres;
+            nombre = nombre - valeurLettre;
+        }
+    }
+
+    correspondancesRomainArabe.forEach(correspondance => {
+        extraireChiffreRomain(correspondance[0], correspondance[1]);
+    });
+
+    return chiffresRomains;
+} 
+
+/** 
+ * @description Convertis un nombre romain en nombre arabe.
+ * @requires {@link correspondancesRomainArabe}
+ * @param {String} str - Le nombre romain à convertir
+ * @returns {Number}
+ * @examples convertRomanToArabic('XXIV') → 24
+ */
+function convertRomanToArabic(str) {
+    let result = 0;
+    for (let i = 0;i < correspondancesRomainArabe.length; i++) {
+        while (str.indexOf(correspondancesRomainArabe[i][1]) === 0) {
+            // Ajout de la valeur décimale au résultat
+            result += correspondancesRomainArabe[i][0];
+            // Supprimer la lettre romaine correspondante du début
+            str = str.replace(correspondancesRomainArabe[i][1],'');
+        }
+    }
+    if (str != '') {
+        result = 0;
+    }
+    return result;
+} 
+
+/* OUTPUTS */
+exports.convertRomanToArabicOutput = (res, argsObject) => {
+    let { romanNumber } = argsObject;
+    
+    // S'il n'y a pas les champs obligatoire
+    if (!(romanNumber)) {
+        return sendResponse(res, requiredFields);
+    }
+
+    // Formate le paramètre
+    try { 
+        romanNumber = romanNumber.toUpperCase(); 
+    } 
+    catch { 
+        return sendResponse(res, generalError); 
+    }
+
+    const result = convertRomanToArabic(romanNumber);
+    if (result === 0) {
+        return sendResponse(res, generalError);
+    }
+        
+    return sendResponse(res, { result, httpStatus: 200 }, true);
+}
+
+exports.convertArabicToRomanOutput = (res, argsObject) => {
+    let { number } = argsObject;
+    number = parseInt(number);
+
+    // S'il n'y a pas les champs obligatoire
+    if (!(number)) {
+        return sendResponse(res, requiredFields);
+    }
+
+    // Si ce n'est pas un nombre
+    if (isNaN(number)) {
+        return sendResponse(res, { result: "Veuillez rentré un nombre valide.", httpStatus: 400 });
+    }
+
+    return sendResponse(res, { result: convertArabicToRoman(number) }, true);
+}

backend/assets/functions/main/randomNumber.js

@@ -0,0 +1,32 @@
+const sendResponse       = require('../../utils/sendResponse');
+const { requiredFields } = require('../../config/errors');
+
+/** 
+ * @description Génère un nombre aléatoire entre un minimum inclus et un maximum inclus. 
+ * @param {Number} min Nombre Minimum 
+ * @param {Number} max Nombre Maximum 
+ * @returns {Number} Nombre aléatoire 
+ * @examples randomNumber(1, 2) → retourne soit 1 ou 2
+ */ 
+function randomNumber(min, max) {
+    return Math.floor(Math.random() * (max - min +1)) + min;
+}
+
+/* OUTPUTS */
+exports.randomNumberOutput = (res, argsObject) => {
+    let { min, max } = argsObject;
+    min = parseInt(min);
+    max = parseInt(max);
+
+    // S'il n'y a pas les champs obligatoire
+    if (!(min && max)) {
+        return sendResponse(res, requiredFields);
+    }
+
+    // Si ce n'est pas des nombres
+    if (isNaN(min) || isNaN(max)) {
+        return sendResponse(res, { result: "Les paramètres min et max doivent être des nombres...", httpStatus: 400 });
+    }
+
+    return sendResponse(res, { result: randomNumber(min, max) }, true);
+}

backend/assets/utils/sendResponse.js

@@ -2,7 +2,7 @@
  * @description Envoie la réponse au client
  * @param {Response} res Objet réponse d'une réponse http/express
  * @param {Object} object { httpStatus, customProperties{Object}, result }
- * @param {Boolean} isSuccess
+ * @param {Boolean} isSuccess (false par defaut)
  */
 function sendResponse (res, object, isSuccess = false) {
     res.status(object.httpStatus || 200).send({ isSuccess, ...object.customProperties, result: object.result }); 

backend/controllers/functions.js

@@ -0,0 +1,10 @@
+const functionToExecute = require('../assets/functions/functionObject');
+const sendResponse      = require('../assets/utils/sendResponse');
+
+exports.executeFunctionName = (req, res, _next) => {
+    const functionObject = functionToExecute(req.params.functionName);
+    if (functionObject !== undefined) {
+        return functionObject.functionOutput(res, req.body);
+    }  
+    return sendResponse(res, { result: "La fonction n'existe pas.", httpStatus: 404 });
+}

backend/package-lock.json

@@ -96,6 +96,11 @@
         "type-is": "~1.6.17"
       }
     },
+    "bowser": {
+      "version": "2.9.0",
+      "resolved": "https://registry.npmjs.org/bowser/-/bowser-2.9.0.tgz",
+      "integrity": "sha512-2ld76tuLBNFekRgmJfT2+3j5MIrP6bFict8WAIT3beq+srz1gcKNAdNKMqHqauQt63NmAa88HfP1/Ypa9Er3HA=="
+    },
     "boxen": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/boxen/-/boxen-1.3.0.tgz",
@@ -141,6 +146,11 @@
       "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=",
       "dev": true
     },
+    "camelize": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/camelize/-/camelize-1.0.0.tgz",
+      "integrity": "sha1-FkpUg+Yw+kMh5a8HAg5TGDGyYJs="
+    },
     "capture-stack-trace": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/capture-stack-trace/-/capture-stack-trace-1.0.1.tgz",
@@ -229,6 +239,11 @@
         "safe-buffer": "5.1.2"
       }
     },
+    "content-security-policy-builder": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/content-security-policy-builder/-/content-security-policy-builder-2.1.0.tgz",
+      "integrity": "sha512-/MtLWhJVvJNkA9dVLAp6fg9LxD2gfI6R2Fi1hPmfjYXSahJJzcfvoeDOxSyp4NvxMuwWv3WMssE9o31DoULHrQ=="
+    },
     "content-type": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
@@ -279,6 +294,11 @@
       "integrity": "sha1-ojD2T1aDEOFJgAmUB5DsmVRbyn4=",
       "dev": true
     },
+    "dasherize": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/dasherize/-/dasherize-2.0.0.tgz",
+      "integrity": "sha1-bYCcnNDPe7iVLYD8hPoT1H3bEwg="
+    },
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@@ -303,6 +323,16 @@
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       "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA="
     },
+    "dns-prefetch-control": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/dns-prefetch-control/-/dns-prefetch-control-0.2.0.tgz",
+      "integrity": "sha512-hvSnros73+qyZXhHFjx2CMLwoj3Fe7eR9EJsFsqmcI1bB2OBWL/+0YzaEaKssCHnj/6crawNnUyw74Gm2EKe+Q=="
+    },
+    "dont-sniff-mimetype": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/dont-sniff-mimetype/-/dont-sniff-mimetype-1.1.0.tgz",
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+    },
     "dot-prop": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/dot-prop/-/dot-prop-4.2.0.tgz",
@@ -359,6 +389,11 @@
         "strip-eof": "^1.0.0"
       }
     },
+    "expect-ct": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/expect-ct/-/expect-ct-0.2.0.tgz",
+      "integrity": "sha512-6SK3MG/Bbhm8MsgyJAylg+ucIOU71/FzyFalcfu5nY19dH8y/z0tBJU0wrNBXD4B27EoQtqPF/9wqH0iYAd04g=="
+    },
     "express": {
       "version": "4.17.1",
       "resolved": "https://registry.npmjs.org/express/-/express-4.17.1.tgz",
@@ -396,6 +431,11 @@
         "vary": "~1.1.2"
       }
     },
+    "feature-policy": {
+      "version": "0.3.0",
+      "resolved": "https://registry.npmjs.org/feature-policy/-/feature-policy-0.3.0.tgz",
+      "integrity": "sha512-ZtijOTFN7TzCujt1fnNhfWPFPSHeZkesff9AXZj+UEjYBynWNUIYpC87Ve4wHzyexQsImicLu7WsC2LHq7/xrQ=="
+    },
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       "version": "7.0.1",
       "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.0.1.tgz",
@@ -424,6 +464,11 @@
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       "integrity": "sha1-mMI9qxF1ZXuMBXPozszZGw/xjIQ="
     },
+    "frameguard": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/frameguard/-/frameguard-3.1.0.tgz",
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+    },
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@@ -491,6 +536,76 @@
       "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
       "dev": true
     },
+    "helmet": {
+      "version": "3.21.3",
+      "resolved": "https://registry.npmjs.org/helmet/-/helmet-3.21.3.tgz",
+      "integrity": "sha512-8OjGNdpG3WQhPO71fSy2fT4X3FSNutU1LDeAf+YS+Vil6r+fE7w8per5mNed6egGYbZl3QhKXgFzMYSwys+YQw==",
+      "requires": {
+        "depd": "2.0.0",
+        "dns-prefetch-control": "0.2.0",
+        "dont-sniff-mimetype": "1.1.0",
+        "expect-ct": "0.2.0",
+        "feature-policy": "0.3.0",
+        "frameguard": "3.1.0",
+        "helmet-crossdomain": "0.4.0",
+        "helmet-csp": "2.9.5",
+        "hide-powered-by": "1.1.0",
+        "hpkp": "2.0.0",
+        "hsts": "2.2.0",
+        "ienoopen": "1.1.0",
+        "nocache": "2.1.0",
+        "referrer-policy": "1.2.0",
+        "x-xss-protection": "1.3.0"
+      },
+      "dependencies": {
+        "depd": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
+          "integrity": "sha512-g7nH6P6dyDioJogAAGprGpCtVImJhpPk/roCzdb3fIh61/s/nPsfR6onyMwkCAR/OlC3yBC0lESvUoQEAssIrw=="
+        }
+      }
+    },
+    "helmet-crossdomain": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/helmet-crossdomain/-/helmet-crossdomain-0.4.0.tgz",
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+    },
+    "helmet-csp": {
+      "version": "2.9.5",
+      "resolved": "https://registry.npmjs.org/helmet-csp/-/helmet-csp-2.9.5.tgz",
+      "integrity": "sha512-w9nps5adqFQwgktVPDbXkARmZot/nr8aegzQas9AXdBSwBFBBefPpDSTV0wtgHlAUdDwY6MZo7qAl9yts3ppJg==",
+      "requires": {
+        "bowser": "2.9.0",
+        "camelize": "1.0.0",
+        "content-security-policy-builder": "2.1.0",
+        "dasherize": "2.0.0"
+      }
+    },
+    "hide-powered-by": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/hide-powered-by/-/hide-powered-by-1.1.0.tgz",
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+    },
+    "hpkp": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/hpkp/-/hpkp-2.0.0.tgz",
+      "integrity": "sha1-EOFCJk52IVpdMMROxD3mTe5tFnI="
+    },
+    "hsts": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/hsts/-/hsts-2.2.0.tgz",
+      "integrity": "sha512-ToaTnQ2TbJkochoVcdXYm4HOCliNozlviNsg+X2XQLQvZNI/kCHR9rZxVYpJB3UPcHz80PgxRyWQ7PdU1r+VBQ==",
+      "requires": {
+        "depd": "2.0.0"
+      },
+      "dependencies": {
+        "depd": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
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+        }
+      }
+    },
     "http-errors": {
       "version": "1.7.2",
       "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.7.2.tgz",
@@ -511,6 +626,11 @@
         "safer-buffer": ">= 2.1.2 < 3"
       }
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+    "ienoopen": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/ienoopen/-/ienoopen-1.1.0.tgz",
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+    },
     "ignore-by-default": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/ignore-by-default/-/ignore-by-default-1.0.1.tgz",
@@ -750,6 +870,11 @@
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     },
+    "nocache": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/nocache/-/nocache-2.1.0.tgz",
+      "integrity": "sha512-0L9FvHG3nfnnmaEQPjT9xhfN4ISk0A8/2j4M37Np4mcDesJjHgEUfgPhdCyZuFI954tjokaIj/A3NdpFNdEh4Q=="
+    },
     "nodemon": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/nodemon/-/nodemon-2.0.2.tgz",
@@ -949,6 +1074,11 @@
         "picomatch": "^2.0.7"
       }
     },
+    "referrer-policy": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/referrer-policy/-/referrer-policy-1.2.0.tgz",
+      "integrity": "sha512-LgQJIuS6nAy1Jd88DCQRemyE3mS+ispwlqMk3b0yjZ257fI1v9c+/p6SD5gP5FGyXUIgrNOAfmyioHwZtYv2VA=="
+    },
     "registry-auth-token": {
       "version": "3.4.0",
       "resolved": "https://registry.npmjs.org/registry-auth-token/-/registry-auth-token-3.4.0.tgz",
@@ -1244,6 +1374,11 @@
         "signal-exit": "^3.0.2"
       }
     },
+    "x-xss-protection": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/x-xss-protection/-/x-xss-protection-1.3.0.tgz",
+      "integrity": "sha512-kpyBI9TlVipZO4diReZMAHWtS0MMa/7Kgx8hwG/EuZLiA6sg4Ah/4TRdASHhRRN3boobzcYgFRUFSgHRge6Qhg=="
+    },
     "xdg-basedir": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-3.0.0.tgz",

backend/package.json

@@ -11,7 +11,8 @@
   "license": "MIT",
   "dependencies": {
     "cors": "^2.8.5",
-    "express": "^4.17.1"
+    "express": "^4.17.1",
+    "helmet": "^3.21.3"
   },
   "devDependencies": {
     "morgan": "^1.9.1",

backend/routes/functions.js

@@ -0,0 +1,11 @@
+const { Router } = require('express');
+const { executeFunctionName } = require('../controllers/functions');
+
+const FunctionsRouter = Router();
+
+FunctionsRouter.route('/:functionName')
+
+    // Exécute la fonction demandée en paramètre
+    .post(executeFunctionName);
+
+module.exports = FunctionsRouter;