Add authentication layer

central_frontend/src/App.tsx

@@ -1,5 +1,10 @@
+import { AuthApi } from "./api/AuthApi";
+import { ServerApi } from "./api/ServerApi";
 import { LoginRoute } from "./routes/LoginRoute";
 
 export function App() {
-  return <LoginRoute />;
+  if (!AuthApi.SignedIn && !ServerApi.Config.auth_disabled)
+    return <LoginRoute />;
+
+  return <>logged in todo</>;
 }

central_frontend/src/api/ApiClient.ts

@@ -0,0 +1,177 @@
+import { AuthApi } from "./AuthApi";
+
+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) {
+      AuthApi.UnsetAuthenticated();
+      window.location.href = import.meta.env.VITE_APP_BASENAME;
+    }
+
+    if (!args.allowFail && (status < 200 || status > 299))
+      throw new ApiError("Request failed!", status, data);
+
+    return {
+      data: data,
+      status: status,
+    };
+  }
+}

central_frontend/src/api/AuthApi.ts

@@ -0,0 +1,70 @@
+import { APIClient } from "./ApiClient";
+
+export interface AuthInfo {
+  name: string;
+}
+
+const TokenStateKey = "auth-state";
+
+export class AuthApi {
+  /**
+   * Check out whether user is signed in or not
+   */
+  static get SignedIn(): boolean {
+    return localStorage.getItem(TokenStateKey) !== null;
+  }
+
+  /**
+   * Mark user as authenticated
+   */
+  static SetAuthenticated() {
+    localStorage.setItem(TokenStateKey, "");
+  }
+
+  /**
+   * Un-mark user as authenticated
+   */
+  static UnsetAuthenticated() {
+    localStorage.removeItem(TokenStateKey);
+  }
+
+  /**
+   * Authenticate using user and password
+   */
+  static async AuthWithPassword(user: string, password: string): Promise<void> {
+    await APIClient.exec({
+      uri: "/auth/password_auth",
+      method: "POST",
+      jsonData: {
+        user,
+        password,
+      },
+    });
+
+    this.SetAuthenticated();
+  }
+
+  /**
+   * Get auth information
+   */
+  static async GetAuthInfo(): Promise<AuthInfo> {
+    return (
+      await APIClient.exec({
+        uri: "/auth/info",
+        method: "GET",
+      })
+    ).data;
+  }
+
+  /**
+   * Sign out
+   */
+  static async SignOut(): Promise<void> {
+    await APIClient.exec({
+      uri: "/auth/sign_out",
+      method: "GET",
+    });
+
+    this.UnsetAuthenticated();
+  }
+}

central_frontend/src/api/ServerApi.ts

@@ -0,0 +1,29 @@
+import { APIClient } from "./ApiClient";
+
+export interface ServerConfig {
+  auth_disabled: 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;
+  }
+}

central_frontend/src/hooks/context_providers/ConfirmDialogProvider.tsx

@@ -72,10 +72,10 @@ export function ConfirmDialogProvider(
         </DialogContent>
         <DialogActions>
           <Button onClick={() => handleClose(false)} autoFocus>
-            Annuler
+            Cancel
           </Button>
           <Button onClick={() => handleClose(true)} color="error">
-            {confirmButton ?? "Confirmer"}
+            {confirmButton ?? "Confirm"}
           </Button>
         </DialogActions>
       </Dialog>

central_frontend/src/main.tsx

@@ -11,6 +11,8 @@ import { DarkThemeProvider } from "./hooks/context_providers/DarkThemeProvider";
 import { LoadingMessageProvider } from "./hooks/context_providers/LoadingMessageProvider";
 import { SnackbarProvider } from "./hooks/context_providers/SnackbarProvider";
 import "./index.css";
+import { ServerApi } from "./api/ServerApi";
+import { AsyncWidget } from "./widgets/AsyncWidget";
 
 ReactDOM.createRoot(document.getElementById("root")!).render(
   <React.StrictMode>
@@ -19,7 +21,12 @@ ReactDOM.createRoot(document.getElementById("root")!).render(
         <ConfirmDialogProvider>
           <SnackbarProvider>
             <LoadingMessageProvider>
-              <App />
+              <AsyncWidget
+                loadKey={1}
+                load={async () => await ServerApi.LoadConfig()}
+                errMsg="Failed to connect to backend to retrieve static config!"
+                build={() => <App />}
+              />
             </LoadingMessageProvider>
           </SnackbarProvider>
         </ConfirmDialogProvider>

central_frontend/src/routes/LoginRoute.tsx

@@ -1,16 +1,18 @@
-import * as React from "react";
+import LockOutlinedIcon from "@mui/icons-material/LockOutlined";
+import { Alert } from "@mui/material";
 import Avatar from "@mui/material/Avatar";
+import Box from "@mui/material/Box";
 import Button from "@mui/material/Button";
 import CssBaseline from "@mui/material/CssBaseline";
-import TextField from "@mui/material/TextField";
-import FormControlLabel from "@mui/material/FormControlLabel";
-import Checkbox from "@mui/material/Checkbox";
+import Grid from "@mui/material/Grid";
 import Link from "@mui/material/Link";
 import Paper from "@mui/material/Paper";
-import Box from "@mui/material/Box";
-import Grid from "@mui/material/Grid";
-import LockOutlinedIcon from "@mui/icons-material/LockOutlined";
+import TextField from "@mui/material/TextField";
 import Typography from "@mui/material/Typography";
+import * as React from "react";
+import { useAlert } from "../hooks/context_providers/AlertDialogProvider";
+import { useLoadingMessage } from "../hooks/context_providers/LoadingMessageProvider";
+import { AuthApi } from "../api/AuthApi";
 
 function Copyright(props: any) {
   return (
@@ -31,12 +33,28 @@ function Copyright(props: any) {
 }
 
 export function LoginRoute() {
+  const loadingMessage = useLoadingMessage();
+
   const [user, setUser] = React.useState("");
   const [password, setPassword] = React.useState("");
 
-  const handleSubmit = (event: React.FormEvent<HTMLFormElement>) => {
+  const [error, setError] = React.useState<string | undefined>();
+
+  const handleSubmit = async (event: React.FormEvent<HTMLFormElement>) => {
     event.preventDefault();
-    // TODO
+    try {
+      loadingMessage.show("Signing in...");
+      setError(undefined);
+
+      await AuthApi.AuthWithPassword(user, password);
+
+      location.href = "/";
+    } catch (e) {
+      console.error("Failed to perform login!", e);
+      setError(`Failed to authenticate! ${e}`);
+    } finally {
+      loadingMessage.hide();
+    }
   };
 
   return (
@@ -73,6 +91,9 @@ export function LoginRoute() {
           <Typography component="h1" variant="h5">
             SolarEnergy
           </Typography>
+
+          {error && <Alert severity="error">{error}</Alert>}
+
           <Box
             component="form"
             noValidate

central_frontend/src/widgets/AsyncWidget.tsx

@@ -0,0 +1,92 @@
+import { Alert, Box, Button, CircularProgress } from "@mui/material";
+import { useEffect, useRef, useState } from "react";
+
+enum State {
+  Loading,
+  Ready,
+  Error,
+}
+
+export function AsyncWidget(p: {
+  loadKey: any;
+  load: () => Promise<void>;
+  errMsg: string;
+  build: () => React.ReactElement;
+  ready?: boolean;
+  errAdditionalElement?: () => React.ReactElement;
+}): React.ReactElement {
+  const [state, setState] = useState(State.Loading);
+
+  const counter = useRef<any | null>(null);
+
+  const load = async () => {
+    try {
+      setState(State.Loading);
+      await p.load();
+      setState(State.Ready);
+    } catch (e) {
+      console.error(e);
+      setState(State.Error);
+    }
+  };
+
+  useEffect(() => {
+    if (counter.current === p.loadKey) return;
+    counter.current = p.loadKey;
+
+    load();
+  });
+
+  if (state === State.Error)
+    return (
+      <Box
+        component="div"
+        sx={{
+          display: "flex",
+          justifyContent: "center",
+          alignItems: "center",
+          height: "100%",
+          flex: "1",
+          flexDirection: "column",
+          backgroundColor: (theme) =>
+            theme.palette.mode === "light"
+              ? theme.palette.grey[100]
+              : theme.palette.grey[900],
+        }}
+      >
+        <Alert
+          variant="outlined"
+          severity="error"
+          style={{ margin: "0px 15px 15px 15px" }}
+        >
+          {p.errMsg}
+        </Alert>
+
+        <Button onClick={load}>Try again</Button>
+
+        {p.errAdditionalElement && p.errAdditionalElement()}
+      </Box>
+    );
+
+  if (state === State.Loading || p.ready === false)
+    return (
+      <Box
+        component="div"
+        sx={{
+          display: "flex",
+          justifyContent: "center",
+          alignItems: "center",
+          height: "100%",
+          flex: "1",
+          backgroundColor: (theme) =>
+            theme.palette.mode === "light"
+              ? theme.palette.grey[100]
+              : theme.palette.grey[900],
+        }}
+      >
+        <CircularProgress />
+      </Box>
+    );
+
+  return p.build();
+}