Add endpoints, services, and security controls for particle file management, including save and download APIs.

frontend/src/app/particles/particles.component.ts

@@ -22,6 +22,7 @@ import {ParticleComponent} from './components/particle/particle.component';
 import {FramesComponent} from './components/frames/frames.component';
 import {MatSnackBar} from '@angular/material/snack-bar';
 import {RenderContainerComponent} from './components/render-container/render-container.component';
+import {ParticlesService} from '../../api';
 
 @Component({
   selector: 'app-particles',
@@ -55,6 +56,7 @@ export class ParticlesComponent {
     private intersectionPlaneService: IntersectionPlaneService,
     private particleManagerService: ParticleManagerService,
     private matSnackBar: MatSnackBar,
+    private particlesService: ParticlesService,
   ) {
   }
 
@@ -93,9 +95,38 @@ export class ParticlesComponent {
     return this.particleManagerService.generateJson();
   }
 
+  public getJsonFile(): Blob {
+    const jsonContent = this.generateJson();
+    return new Blob([jsonContent], {type: 'application/json'});
+  }
+
+  public saveJsonToFile(): void {
+    const jsonContent = this.generateJson();
+    const blob = new Blob([jsonContent], {type: 'application/json'});
+    const url = window.URL.createObjectURL(blob);
+
+    // Create a temporary link element
+    const a = document.createElement('a');
+    a.href = url;
+    a.download = 'particle-data.json';
+
+    // Append to the document, click it, and remove it
+    document.body.appendChild(a);
+    a.click();
+
+    // Clean up
+    window.URL.revokeObjectURL(url);
+    document.body.removeChild(a);
+
+    this.matSnackBar.open('JSON file downloaded', '', {duration: 2000});
+  }
+
+
   public copyJson() {
     navigator.clipboard.writeText(this.generateJson()).then(() => {
       this.matSnackBar.open('Copied to clipboard', '', {duration: 2000})
     });
+    //TODO validation
+    this.particlesService.saveFile(this.particleManagerService.getParticleData().particle_name, this.getJsonFile());
   }
 }