Managed to load server configuration from WebUI

remote_frontend/src/api/ApiClient.ts

@@ -0,0 +1,174 @@
+interface RequestParams {
+  uri: string;
+  method: "GET" | "POST" | "DELETE" | "PATCH" | "PUT";
+  allowFail?: boolean;
+  jsonData?: any;
+  formData?: FormData;
+  upProgress?: (progress: number) => void;
+  downProgress?: (e: { progress: number; total: number }) => void;
+}
+
+interface APIResponse {
+  data: any;
+  status: number;
+}
+
+export class ApiError extends Error {
+  constructor(message: string, public code: number, public data: any) {
+    super(`HTTP status: ${code}\nMessage: ${message}\nData=${data}`);
+  }
+}
+
+export class APIClient {
+  /**
+   * Get backend URL
+   */
+  static backendURL(): string {
+    const URL = import.meta.env.VITE_APP_BACKEND ?? "";
+    if (URL.length === 0) throw new Error("Backend URL undefined!");
+    return URL;
+  }
+
+  /**
+   * Check out whether the backend is accessed through
+   * HTTPS or not
+   */
+  static IsBackendSecure(): boolean {
+    return this.backendURL().startsWith("https");
+  }
+
+  /**
+   * Perform a request on the backend
+   */
+  static async exec(args: RequestParams): Promise<APIResponse> {
+    let body: string | undefined | FormData = undefined;
+    let headers: any = {};
+
+    // JSON request
+    if (args.jsonData) {
+      headers["Content-Type"] = "application/json";
+      body = JSON.stringify(args.jsonData);
+    }
+
+    // Form data request
+    else if (args.formData) {
+      body = args.formData;
+    }
+
+    const url = this.backendURL() + args.uri;
+
+    let data;
+    let status: number;
+
+    // Make the request with XMLHttpRequest
+    if (args.upProgress) {
+      const res: XMLHttpRequest = await new Promise((resolve, reject) => {
+        const xhr = new XMLHttpRequest();
+        xhr.upload.addEventListener("progress", (e) =>
+          args.upProgress!(e.loaded / e.total)
+        );
+        xhr.addEventListener("load", () => resolve(xhr));
+        xhr.addEventListener("error", () =>
+          reject(new Error("File upload failed"))
+        );
+        xhr.addEventListener("abort", () =>
+          reject(new Error("File upload aborted"))
+        );
+        xhr.addEventListener("timeout", () =>
+          reject(new Error("File upload timeout"))
+        );
+        xhr.open(args.method, url, true);
+        xhr.withCredentials = true;
+        for (const key in headers) {
+          if (headers.hasOwnProperty(key))
+            xhr.setRequestHeader(key, headers[key]);
+        }
+        xhr.send(body);
+      });
+
+      status = res.status;
+      if (res.responseType === "json") data = JSON.parse(res.responseText);
+      else data = res.response;
+    }
+
+    // Make the request with fetch
+    else {
+      const res = await fetch(url, {
+        method: args.method,
+        body: body,
+        headers: headers,
+        credentials: "include",
+      });
+
+      // Process response
+      // JSON response
+      if (res.headers.get("content-type") === "application/json")
+        data = await res.json();
+      // Text / XML response
+      else if (
+        ["application/xml", "text/plain"].includes(
+          res.headers.get("content-type") ?? ""
+        )
+      )
+        data = await res.text();
+      // Binary file, tracking download progress
+      else if (res.body !== null && args.downProgress) {
+        // Track download progress
+        const contentEncoding = res.headers.get("content-encoding");
+        const contentLength = contentEncoding
+          ? null
+          : res.headers.get("content-length");
+
+        const total = parseInt(contentLength ?? "0", 10);
+        let loaded = 0;
+
+        const resInt = new Response(
+          new ReadableStream({
+            start(controller) {
+              const reader = res.body!.getReader();
+
+              const read = async () => {
+                try {
+                  const ret = await reader.read();
+                  if (ret.done) {
+                    controller.close();
+                    return;
+                  }
+                  loaded += ret.value.byteLength;
+                  args.downProgress!({ progress: loaded, total });
+                  controller.enqueue(ret.value);
+                  read();
+                } catch (e) {
+                  console.error(e);
+                  controller.error(e);
+                }
+              };
+
+              read();
+            },
+          })
+        );
+
+        data = await resInt.blob();
+      }
+
+      // Do not track progress (binary file)
+      else data = await res.blob();
+
+      status = res.status;
+    }
+
+    // Handle expired tokens
+    if (status === 412) {
+      window.location.href = "/";
+    }
+
+    if (!args.allowFail && (status < 200 || status > 299))
+      throw new ApiError("Request failed!", status, data);
+
+    return {
+      data: data,
+      status: status,
+    };
+  }
+}

remote_frontend/src/api/ServerApi.ts

@@ -0,0 +1,30 @@
+import { APIClient } from "./ApiClient";
+
+export interface ServerConfig {
+  authenticated: boolean;
+  disable_auth: boolean;
+}
+
+let config: ServerConfig | null = null;
+
+export class ServerApi {
+  /**
+   * Get server configuration
+   */
+  static async LoadConfig(): Promise<void> {
+    config = (
+      await APIClient.exec({
+        uri: "/server/config",
+        method: "GET",
+      })
+    ).data;
+  }
+
+  /**
+   * Get cached configuration
+   */
+  static get Config(): ServerConfig {
+    if (config === null) throw new Error("Missing configuration!");
+    return config;
+  }
+}