fix launch code

src/components/Launch.js

@@ -1,68 +1,73 @@
-import React from 'react';
-import FHIR from 'fhirclient';
-import Box from '@mui/material/Box';
-import CircularProgress from '@mui/material/CircularProgress';
-import Error from './Error';
-import {queryPatientIdKey} from '../util/util.js';
-import '../style/App.scss';
+import React from "react";
+import FHIR from "fhirclient";
+import Stack from "@mui/material/Stack";
+import CircularProgress from "@mui/material/CircularProgress";
+import Error from "./Error";
+import { getEnv, queryPatientIdKey } from "../util/util.js";
+import "../style/App.scss";
 
 export default function Launch() {
+  const [error, setError] = React.useState("");
 
-    const [error, setError] = React.useState('');
+  React.useEffect(() => {
+    let authURL = "launch-context.json";
+    const backendURL = getEnv("REACT_APP_BACKEND_URL");
+    if (backendURL) {
+      authURL = `${backendURL}/auth/auth-info`;
+    }
+    const urlParams = new URLSearchParams(window.location.search);
+    //retrieve patient id from URL querystring if any
+    let patientId = urlParams.get("patient");
+    console.log("patient id from url query string: ", patientId);
+    console.log("Auth url ", authURL);
 
-    React.useEffect(() => {
-        let authURL = 'launch-context.json';
-        if (process.env.REACT_APP_BACKEND_URL) {
-            authURL = `${process.env.REACT_APP_BACKEND_URL}/auth/auth-info`;
+    fetch(authURL, {
+      // include cookies in request
+      credentials: "include",
+    })
+      .then((result) => {
+        if (!result.ok) {
+          throw Error(result.status);
         }
-        const urlParams = new URLSearchParams(window.location.search);
-         //retrieve patient id from URL querystring if any
-        let patientId = urlParams.get('patient');
-        console.log("patient id from url query string: ", patientId);
-	    console.log("authURL: ", authURL);
-
-        fetch(authURL, {
-            // include cookies in request
-            credentials: 'include'
-        })
-        .then(result => {
-            if (!result.ok) {
-                throw Error(result.status);
-            }
-            return result.json();
-        })
-        .catch(e => setError(e))
-        .then(json => {
-            if (patientId) {
-                //only do this IF patient id comes from url queryString
-                json.patientId = patientId;
-                sessionStorage.setItem(queryPatientIdKey, patientId);
-            }
-	    //allow auth scopes to be updated via environment variable
-	    //see https://build.fhir.org/ig/HL7/smart-app-launch/scopes-and-launch-context.html
-	    const envAuthScopes = process.env.REACT_APP_AUTH_SCOPES;
-	    if (envAuthScopes) json.scope = envAuthScopes;
-
-            console.log("launch context json ", json);
-            FHIR.oauth2.authorize(json).catch((e) => {
-                setError(e);
-            });
+        return result.json();
+      })
+      .catch((e) => setError(e))
+      .then((json) => {
+        if (patientId) {
+          //only do this IF patient id comes from url queryString
+          json.patientId = patientId;
+          sessionStorage.setItem(queryPatientIdKey, patientId);
+        }
+        //allow auth scopes to be updated via environment variable
+        //see https://build.fhir.org/ig/HL7/smart-app-launch/scopes-and-launch-context.html
+        const envAuthScopes = getEnv("REACT_APP_AUTH_SCOPES");
+        if (envAuthScopes) json.scope = envAuthScopes;
 
-        })
-        .catch(e => {
-            setError(e);
-            console.log('launch error ', e);
+        console.log("launch context json ", json);
+        FHIR.oauth2.authorize(json).catch((e) => {
+          setError(e);
         });
-    }, []);
+      })
+      .catch((e) => {
+        setError(e);
+        console.log("launch error ", e);
+      });
+  }, []);
 
-    return (
-        <React.Fragment>
-            {error && <Error message={error.message}></Error>}
-            {!error && <Box style={{ padding: "1rem" }}>
-                <CircularProgress></CircularProgress>
-                <span>Launching ...</span>
-            </Box>}
-        </React.Fragment>
-    );
+  return (
+    <React.Fragment>
+      {error && <Error message={error.message}></Error>}
+      {!error && (
+        <Stack
+          spacing={2}
+          direction="row"
+          style={{ padding: "24px" }}
+          alignItems="center"
+        >
+          <CircularProgress></CircularProgress>
+          <div>Launching ...</div>
+        </Stack>
+      )}
+    </React.Fragment>
+  );
 }
-

src/util/util.js

@@ -23,4 +23,9 @@ export function getFHIRResourcePaths(patientId) {
   });
 }
 
+export const getEnv = (key) => {
+  if (!process || !process.env) return "";
+  return process.env[key];
+};
+
 export const queryPatientIdKey = 'launch_queryPatientId';