refactor: update multiform-validator to version 2.2.7

- Updated the CDN links in the README.md file to use the latest version (2.2.7) of multiform-validator.
- Updated the version number in the package.json file to 2.2.7.
- Refactored the type definitions and error messages in the validateEmail.ts file.
- Updated the module code generation in the tsconfig.json file to use CommonJS instead of ES6.
- Added new test cases for invalid PNG, JPEG, and GIF images in the tests folder.
- Generated fake PNG, JPEG, and GIF images for testing purposes.

Author: gabriel-logan

.yarn/install-state.gz

@@ -20,12 +20,12 @@ Feel free to find bugs and report them to me. Your feedback is highly appreciate
 jsDelivr:
 
 ```bash
-https://cdn.jsdelivr.net/npm/multiform-validator@2.2.3/+esm
+https://cdn.jsdelivr.net/npm/multiform-validator@2.2.7/+esm
 ```
 
 ```html
 <script type="module">
-	import multiform-validator from "https://cdn.jsdelivr.net/npm/multiform-validator@2.2.3/+esm"
+	import multiform-validator from "https://cdn.jsdelivr.net/npm/multiform-validator@2.2.7/+esm"
 </script>
 ```
 
@@ -71,7 +71,7 @@ using esm:
 
 ```html
 <script type="module">
-	import multiformValidator from "https://cdn.jsdelivr.net/npm/multiform-validator@2.2.3/+esm";
+	import multiformValidator from "https://cdn.jsdelivr.net/npm/multiform-validator@2.2.7/+esm";
 	const emailResult = multiformValidator.isEmail("123456");
 	const cpfResult = multiformValidator.cpfIsValid("123456");
 

README.md

@@ -1,6 +1,6 @@
 {
 	"name": "multiform-validator",
-	"version": "2.2.6",
+	"version": "2.2.7",
 	"description": "Javascript library made to validate, several form fields, such as: email, images, phone, password, cpf etc.",
 	"main": "./dist/cjs/index.cjs",
 	"module": "./dist/esm/index.mjs",

package.json

@@ -1,9 +1,23 @@
 export default function validateGif(fileBuffer: Buffer): boolean {
-	const isGif: boolean =
-		fileBuffer[0] == 0x47 &&
-		fileBuffer[1] == 0x49 &&
-		fileBuffer[2] == 0x46 &&
-		fileBuffer[3] == 0x38;
+	const isGifSignature: boolean =
+		fileBuffer[0] === 0x47 && // 'G'
+		fileBuffer[1] === 0x49 && // 'I'
+		fileBuffer[2] === 0x46 && // 'F'
+		fileBuffer[3] === 0x38 && // '8'
+		(fileBuffer[4] === 0x39 || fileBuffer[4] === 0x37) && // '9' ou '7'
+		fileBuffer[5] === 0x61; // 'a'
 
-	return isGif;
+	if (isGifSignature) {
+		const fileSize: number = fileBuffer.length;
+		// The GIF ends with 0x00 0x3B (end marker)
+		if (
+			fileBuffer[fileSize - 2] === 0x00 &&
+			fileBuffer[fileSize - 1] === 0x3b
+		) {
+			return true;
+		}
+		return false; // Corrupted or invalid GIF file
+	}
+
+	return isGifSignature;
 }

src/isValidImage/validateGif.ts

@@ -1,6 +1,9 @@
 export default function validateIco(fileBuffer: Buffer): boolean {
 	const isIco: boolean =
-		fileBuffer[0] === 0x00 && fileBuffer[1] === 0x00 && fileBuffer[2] === 0x01;
+		fileBuffer[0] === 0x00 &&
+		fileBuffer[1] === 0x00 &&
+		fileBuffer[2] === 0x01 &&
+		fileBuffer[3] === 0x00;
 
 	return isIco;
 }

src/isValidImage/validateIco.ts

@@ -1,6 +1,21 @@
 export default function validateJpeg(fileBuffer: Buffer): boolean {
-	const isJpeg: boolean =
+	const jpegSignature: boolean =
 		fileBuffer[0] === 0xff && fileBuffer[1] === 0xd8 && fileBuffer[2] === 0xff;
 
-	return isJpeg;
+	if (jpegSignature) {
+		const fileSize: number = fileBuffer.length;
+		// Valid JPEG ends with marker 0xFF, 0xD9
+
+		// Check if the last two bytes are 0xFF, 0xD9
+		if (
+			fileBuffer[fileSize - 2] !== 0xff ||
+			fileBuffer[fileSize - 1] !== 0xd9
+		) {
+			return false;
+		}
+
+		return true;
+	}
+
+	return jpegSignature;
 }

src/isValidImage/validateJpeg.ts

@@ -1,9 +1,26 @@
 export default function validatePng(fileBuffer: Buffer): boolean {
-	const isPng: boolean =
+	const pngSignature: boolean =
 		fileBuffer[0] === 0x89 &&
 		fileBuffer[1] === 0x50 &&
 		fileBuffer[2] === 0x4e &&
-		fileBuffer[3] === 0x47;
+		fileBuffer[3] === 0x47 &&
+		fileBuffer[4] === 0x0d &&
+		fileBuffer[5] === 0x0a &&
+		fileBuffer[6] === 0x1a &&
+		fileBuffer[7] === 0x0a;
 
-	return isPng;
+	if (pngSignature) {
+		const fileSize: number = fileBuffer.length;
+		// A valid PNG structure has a specific byte sequence at the end
+		const pngEndSignature: number[] = [
+			0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 0x82,
+		];
+		for (let i: number = 0; i < pngEndSignature.length; i++) {
+			if (fileBuffer[fileSize - 8 + i] !== pngEndSignature[i]) {
+				return false; // PNG file is corrupt or invalid
+			}
+		}
+	}
+
+	return pngSignature;
 }