EW-995 added tsp rest client

apps/server/src/infra/tsp-client/tsp-rest-client.ts

@@ -0,0 +1,66 @@
+import { HttpService } from '@nestjs/axios';
+import moment from 'moment';
+import { v4 as uuidv4 } from 'uuid';
+import * as jwt from 'jsonwebtoken';
+
+export class TSPRestClient {
+	// private readonly TSP_API_BASE_URL: string;
+	// private readonly TSP_API_CLIENT_ID: string;
+	// private readonly TSP_API_CLIENT_SECRET: string;
+	// private readonly TSP_API_TOKEN_ENDPOINT: string;
+
+	private lastToken!: string;
+
+	private lastTokenExpires!: number;
+
+	constructor(private readonly httpService: HttpService) {}
+
+	private getJwt(lifetime = 30000): string {
+		const issueDate = Date.now();
+
+		// check if the current token is still valid
+		if (issueDate < this.lastTokenExpires - 1000) {
+			return this.lastToken;
+		}
+
+		// update the token and expiration date
+		this.lastTokenExpires = issueDate + lifetime;
+
+		// create the payload for the jwt
+		const payload = {
+			apiClientSecret: 'secret', // TSP_API_CLIENT_SECRET
+			iss: 'locahost', // process.env.SC_DOMAIN
+			aud: 'base_url', // TSP_API_BASE_URL
+			sub: 'host', // process.env.HOST
+			exp: issueDate + lifetime,
+			iat: issueDate,
+			jti: uuidv4(),
+		};
+
+		const token: string = jwt.sign(payload, 'secret');
+
+		// store the token for future use
+		this.lastToken = token;
+
+		return token;
+	}
+
+	private getHeaders(): Record<string, string> {
+		const token = this.getJwt();
+		return { Authorization: `AUTH-JWT apiClientId=${'client_id'},jwt=${token}` };
+	}
+
+	public request<T>(path: string, lastChange: Date = new Date(0)): Promise<T> {
+		const lastChangeDate = moment(lastChange).format('YYYY-MM-DD HH:mm:ss.SSS');
+		const requestUrl = new URL('base_url', path); // TSP_API_BASE_URL
+
+		const response = this.httpService.get(requestUrl.toString(), {
+			headers: this.getHeaders(),
+			params: {
+				dtLetzteAenderung: lastChangeDate,
+			},
+		});
+
+		return response.data;
+	}
+}