feat: add user profile picture, region, and timezone update functionality

src/guards/profile.picture.guard.ts

@@ -0,0 +1,45 @@
+import { CanActivate, ExecutionContext, Injectable } from '@nestjs/common';
+import { BadRequestException } from '@nestjs/common';
+
+@Injectable()
+export class CheckProfilePictureGuard implements CanActivate {
+  async canActivate(context: ExecutionContext): Promise<boolean> {
+    const req = context.switchToHttp().getRequest();
+
+    try {
+      if (req.body) {
+        const { profilePicture } = req.body;
+        if (profilePicture) {
+          const isBase64 = /^data:image\/[a-z]+;base64,/.test(profilePicture);
+          if (!isBase64) {
+            throw new BadRequestException(
+              'Profile picture must be in base64 format.',
+            );
+          }
+
+          // Get the size of the base64 string (in bytes)
+          const base64StringLength =
+            profilePicture.length - 'data:image/[a-z]+;base64,'.length;
+          const base64ImageSizeInBytes = base64StringLength * 0.75; // Base64 encoding expands data by 33%
+          const maxSizeInBytes = 1 * 1024 * 1024; // 1 MB
+
+          // Check if the size exceeds the limit
+          if (base64ImageSizeInBytes > maxSizeInBytes) {
+            throw new BadRequestException(
+              'Profile picture size exceeds the allowed limit.',
+            );
+          }
+        }
+        // Check if profilePicture is a base64 string
+      } else {
+        throw new BadRequestException('Invalid request parameters');
+      }
+
+      return true;
+    } catch (error) {
+      console.log('Profile picture guard error: ', error);
+
+      throw error;
+    }
+  }
+}