fix: added dependencies for development. feat: added axios as dependency. feat: added some initial modeals. feat: setup unit testing

src/OnspringClient.ts

@@ -1,9 +1,25 @@
-class OnspringClient {
-  private readonly _baseUrl: string;
-  private readonly _apiKey: string;
+import { AxiosInstance } from "axios";
+import axios from "axios";
+import { ArgumentValidator } from "./models/ArgumentValidator";
 
-  constructor(baseUrl: string, apiKey: string) {
-    this._baseUrl = baseUrl;
-    this._apiKey = apiKey;
+export class OnspringClient {
+  protected readonly client: AxiosInstance;
+
+  constructor(baseUrl: string | undefined | null, apiKey: string | undefined | null) {
+    if (ArgumentValidator.isValidUrl(baseUrl) === false) {
+      throw new Error("baseUrl must be an absolute and well-formed URI.");
+    }
+
+    if (ArgumentValidator.isNullOrWhiteSpace(apiKey)) { 
+      throw new Error("apiKey cannot be null/empty/whitespace.");
+    }
+
+    this.client = axios.create({
+      baseURL: baseUrl,
+      headers: {
+        "x-apikey": apiKey,
+        "x-api-version": "2",
+      },
+    });
   }
 }

src/models/ApiResponse.ts

@@ -0,0 +1,13 @@
+export class ApiResponse<T> {
+  readonly statusCode: number;
+  readonly isSuccessful: boolean;
+  readonly message: string;
+  readonly data: T;
+
+  constructor(statusCode: number, isSuccessful: boolean, message: string, data: T) {
+    this.statusCode = statusCode;
+    this.isSuccessful = statusCode < 400;
+    this.message = message;
+    this.data = data;
+  }
+}

src/models/App.ts

@@ -0,0 +1,5 @@
+class App {
+  href: string;
+  id: number;
+  name: string;
+}

src/models/ArgumentValidator.ts

@@ -0,0 +1,17 @@
+export class ArgumentValidator {
+    public static isNullOrWhiteSpace(value: string | null | undefined): boolean {
+      return value === null || value === undefined || (/^\s*$/).test(value);
+    }
+
+    public static isValidUrl(value: string | null | undefined): boolean {
+      let url: URL;
+
+      try {
+        url = new URL(value);
+      } catch (error) {
+        return false;
+      }
+
+      return url.protocol === 'http:' || url.protocol === 'https:';
+    }
+}

src/models/PagingRequest.ts

@@ -0,0 +1,9 @@
+export class PagingRequest {
+  pageNumber: number;
+  pageSize: number;
+
+  constructor(pageNumber: number, pageSize: number) {
+    this.pageNumber = pageNumber;
+    this.pageSize = pageSize;
+  }
+}