feat: load local session file by its URL

refs #476

src/app/app.module.ts

@@ -118,6 +118,7 @@ import {
     JalhydModelValidationStepDirective
 } from "./directives/jalhyd-model-validation.directive";
 import { ImmediateErrorStateMatcher } from "./formulaire/immediate-error-state-matcher";
+import { LoadSessionURLComponent } from "./components/load-session-url/load-session-url.component";
 
 const appRoutes: Routes = [
     { path: "list/search", component: CalculatorListComponent },
@@ -126,6 +127,7 @@ const appRoutes: Routes = [
     { path: "setup", component: ApplicationSetupComponent },
     { path: "diagram", component: ModulesDiagramComponent },
     { path: "properties", component: SessionPropertiesComponent },
+    { path: "loadsession/:path", component: LoadSessionURLComponent },
     { path: "**", redirectTo: "list", pathMatch: "full" }
 ];
 
@@ -217,6 +219,7 @@ const appRoutes: Routes = [
         JalhydModelValidationStepDirective,
         JetResultsComponent,
         JetTrajectoryChartComponent,
+        LoadSessionURLComponent,
         LogComponent,
         LogDrawerComponent,
         LogEntryComponent,

src/app/components/load-session-url/load-session-url.component.ts

+import { Component, forwardRef, Inject } from "@angular/core";
+import { ActivatedRoute } from "@angular/router";
+import { AppComponent } from "app/app.component";
+import { HttpService } from "app/services/http.service";
+
+// load a session file by its URL (either local or remote)
+
+@Component({
+    selector: "load-session-url",
+    template: ""
+})
+export class LoadSessionURLComponent {
+    private path: string;
+
+    constructor(
+        @Inject(forwardRef(() => AppComponent)) private appComponent: AppComponent,
+        private route: ActivatedRoute,
+        private httpService: HttpService
+    ) {
+    }
+
+    ngOnInit() {
+        // get "path" argument from URL
+        const path = this.route.snapshot.params.path;
+
+        if (path.startsWith("http")) {
+            // general URL path
+        }
+        else {
+            // local path
+
+            // input URL example : http://localhost:4200/#/loadsession/app%2Fexamples%2Fpab-complete-chain.json
+            // extracted path : app/examples/pab-complete-chain.json
+
+            this.loadLocalSession(path);
+        }
+    }
+
+    /**
+     * load a locally stored session file
+     * @param path local path in the form eg. app/examples/pab-complete-chain.json
+     */
+    private async loadLocalSession(path: string) {
+        try {
+            const d = await this.httpService.httpGetBlobRequestPromise(path);
+            const f: any = new Blob([d], { type: "application/json" });
+            this.appComponent.loadSessionFile(f);
+        } catch (e) {
+            alert("ERROR: session " + path + " does not exist");
+        }
+    }
+}