Add todo list request service.

1 files changed, 50 insertions, 0 deletions

diff --git a/Timeline/ClientApp/src/app/todo-list.service.ts b/Timeline/ClientApp/src/app/todo-list.service.ts
new file mode 100644
index 00000000..e92a11c9
--- /dev/null
+++ b/Timeline/ClientApp/src/app/todo-list.service.ts
@@ -0,0 +1,50 @@
+import { Injectable } from '@angular/core';
+import { HttpClient, HttpHeaders } from '@angular/common/http';
+import { Observable } from 'rxjs';
+import { switchMap, concatMap, map, toArray } from 'rxjs/operators';
+
+interface WiqlWorkItemResult {
+  id: number;
+  url: string;
+}
+
+interface WiqlResult {
+  workItems: WiqlWorkItemResult[];
+}
+
+interface WorkItemResult {
+  id: number;
+  fields: { [name: string]: any };
+}
+
+@Injectable({
+  providedIn: 'root'
+})
+export class TodoListService {
+
+  private username = 'crupest';
+  private pat = 'ehnmegogmk6r7qlkpy6zdl2hnfl6ntqbvggzxvvgp4a5vhr7lmnq';
+  private organization = 'crupest-web';
+  private project = 'Timeline';
+  private fieldId = 'System.Title';
+
+  private headers: HttpHeaders;
+
+  constructor(private client: HttpClient) {
+    this.headers = new HttpHeaders({
+      'Accept': 'application/json',
+      'Authorization': `Basic ${btoa(this.username + ':' + this.pat)}`
+    });
+  }
+
+  getWorkItemList(): Observable<string[]> {
+    return this.client.post<WiqlResult>(`https://dev.azure.com/${this.organization}/${this.project}/_apis/wit/wiql?api-version=5.0`, {
+      query: 'SELECT [System.Id] FROM workitems WHERE [System.TeamProject] = @project'
+    }, { headers: this.headers }).pipe(
+      switchMap(result => result.workItems),
+      concatMap(result => this.client.get<WorkItemResult>(result.url, {headers: this.headers})),
+      map(result => <string>(result.fields[this.fieldId])),
+      toArray()
+    );
+  }
+}