frontend: load config.json at runtime from public dir, to be overwritable

.gitignore

@@ -1,4 +1,2 @@
 local
-config.json
-src/config.json
 data

docker-compose.yaml

@@ -1,3 +1,9 @@
+# This docker-compose file is intended for development use.  You can simply run
+# `docker-compose up -d` in the repository and it should build and run all
+# required parts of the application. See README.md for details.
+#
+# For a production docker setup, please check the corresponding documentation.
+
 version: '3'
 
 services:
@@ -75,7 +81,9 @@ services:
       - ./frontend/public:/opt/obs/frontend/public
       - ./frontend/tsconfig.json:/opt/obs/frontend/tsconfig.json
       - ./frontend/package.json:/opt/obs/frontend/package.json
-      - ./frontend/src/config.dev.json:/opt/obs/frontend/src/config.json
+
+      # Overwrite the default config with the development mode configuration
+      - ./frontend/config.dev.json:/opt/obs/frontend/public/config.json
     environment:
       - PORT=3000
     links:

frontend/src/App.js

@@ -6,7 +6,7 @@ import {useObservable} from 'rxjs-hooks'
 import {from} from 'rxjs'
 import {pluck} from 'rxjs/operators'
 
-import config from 'config.json'
+import {useConfig} from 'config'
 import styles from './App.module.scss'
 
 import {
@@ -38,6 +38,7 @@ function DropdownItemForLink({navigate, ...props}) {
 }
 
 const App = connect((state) => ({login: state.login}))(function App({login}) {
+  const config = useConfig()
   const apiVersion = useObservable(() => from(api.get('/info')).pipe(pluck('version')))
 
   return (
@@ -148,12 +149,12 @@ const App = connect((state) => ({login: state.login}))(function App({login}) {
                 <Header as="h5">This installation</Header>
                 <List>
                   <List.Item>
-                    <a href={config.privacyPolicyUrl} target="_blank" rel="noreferrer">
+                    <a href={config?.privacyPolicyUrl} target="_blank" rel="noreferrer">
                       Privacy policy
                     </a>
                   </List.Item>
                   <List.Item>
-                    <a href={config.imprintUrl} target="_blank" rel="noreferrer">
+                    <a href={config?.imprintUrl} target="_blank" rel="noreferrer">
                       Imprint
                     </a>
                   </List.Item>

frontend/src/api.js

@@ -2,7 +2,7 @@ import {stringifyParams} from 'query'
 import globalStore from 'store'
 import {setAuth, invalidateAccessToken, resetAuth} from 'reducers/auth'
 import {setLogin} from 'reducers/login'
-import config from 'config.json'
+import configPromise from 'config'
 import {create as createPkce} from 'pkce'
 import download from 'downloadjs'
 
@@ -39,6 +39,7 @@ class API {
    * it supports PKCE.
    */
   async getAuthorizationServerMetadata() {
+    const config = await configPromise
     const url = new URL(config.auth.server)
     const pathSuffix = url.pathname.replace(/^\/+|\/+$/, '')
     url.pathname = '/.well-known/oauth-authorization-server' + (pathSuffix ? '/' + pathSuffix : '')
@@ -117,6 +118,7 @@ class API {
 
     //  Try to use the refresh token
     const {tokenEndpoint} = await this.getAuthorizationServerMetadata()
+    const config = await configPromise
     const url = new URL(tokenEndpoint)
     url.searchParams.append('refresh_token', refreshToken)
     url.searchParams.append('grant_type', 'refresh_token')
@@ -142,6 +144,7 @@ class API {
     }
 
     const {tokenEndpoint} = await this.getAuthorizationServerMetadata()
+    const config = await configPromise
     const url = new URL(tokenEndpoint)
     url.searchParams.append('code', code)
     url.searchParams.append('grant_type', 'authorization_code')
@@ -178,6 +181,7 @@ class API {
 
   async makeLoginUrl() {
     const {authorizationEndpoint} = await this.getAuthorizationServerMetadata()
+    const config = await configPromise
 
     const {codeVerifier, codeChallenge} = createPkce()
     localStorage.setItem('codeVerifier', codeVerifier)
@@ -197,6 +201,7 @@ class API {
 
   async fetch(url, options = {}) {
     const accessToken = await this.getValidAccessToken()
+    const config = await configPromise
 
     const {returnResponse = false, ...fetchOptions} = options
 

frontend/src/components/Map/index.js

@@ -13,7 +13,7 @@ import {fromLonLat} from 'ol/proj'
 // Import styles for open layers + addons
 import 'ol/ol.css'
 
-import config from 'config.json'
+import {useConfig} from 'config'
 
 // Prepare projection
 proj4.defs(
@@ -86,6 +86,11 @@ export function TileLayer({osm, ...props}) {
 }
 
 export function BaseLayer(props) {
+  const config = useConfig()
+  if (!config) {
+    return null
+  }
+
   return (
     <TileLayer
       osm={{
@@ -117,26 +122,30 @@ function FitView({extent}) {
   return null
 }
 
-const minZoom = config.mapTileset?.minZoom ?? 0
-const maxZoom = config.mapTileset?.maxZoom ?? 18
-const mapHomeZoom = config.mapHome?.zoom ?? 15
-const mapHomeLongitude = config.mapHome?.longitude ?? 9.1797
-const mapHomeLatitude = config.mapHome?.latitude ?? 48.7784
-
 function View({...options}) {
   const map = React.useContext(MapContext)
+  const config = useConfig()
 
   const view = React.useMemo(
-    () =>
-      new OlView({
+    () => {
+      if (!config) return null
+
+      const minZoom = config.mapTileset?.minZoom ?? 0
+      const maxZoom = config.mapTileset?.maxZoom ?? 18
+      const mapHomeZoom = config.mapHome?.zoom ?? 15
+      const mapHomeLongitude = config.mapHome?.longitude ?? 9.1797
+      const mapHomeLatitude = config.mapHome?.latitude ?? 48.7784
+
+      return new OlView({
         minZoom,
         maxZoom,
         zoom: Math.max(Math.min(mapHomeZoom, maxZoom), minZoom),
         center: fromLonLat([mapHomeLongitude, mapHomeLatitude]),
         ...options,
-      }),
+      })
+    },
     // eslint-disable-next-line react-hooks/exhaustive-deps
-    []
+    [config]
   )
 
   React.useEffect(() => {

frontend/src/config.ts

@@ -0,0 +1,26 @@
+import React from 'react'
+
+interface Config {
+  apiUrl: string
+}
+
+async function loadConfig(): Promise<Config> {
+  const response = await fetch('./config.json')
+  const config = await response.json()
+  return config
+}
+
+let _configPromise: Promise<Config> = loadConfig()
+let _configCache: null | Config = null
+
+export function useConfig() {
+  const [config, setConfig] = React.useState<Config>(_configCache)
+  React.useEffect(() => {
+    if (!_configCache) {
+      _configPromise.then(setConfig)
+    }
+  }, [])
+  return config
+}
+
+export default _configPromise

frontend/src/pages/SettingsPage.tsx

@@ -7,7 +7,7 @@ import {setLogin} from 'reducers/login'
 import {Page, Stats} from 'components'
 import api from 'api'
 import {findInput} from 'utils'
-import config from 'config.json'
+import {useConfig} from 'config'
 
 const SettingsPage = connect((state) => ({login: state.login}), {setLogin})(function SettingsPage({login, setLogin}) {
   const {register, handleSubmit} = useForm()
@@ -102,6 +102,7 @@ function CopyInput({value, ...props}) {
 const selectField = findInput((ref) => ref?.select())
 
 function ApiKeyDialog({login}) {
+  const config = useConfig()
   const [show, setShow] = React.useState(false)
   const onClick = React.useCallback(
     (e) => {
@@ -131,7 +132,7 @@ function ApiKeyDialog({login}) {
         )}
       </div>
       <p>The API URL should be set to:</p>
-      <CopyInput label="API URL" value={config.apiUrl} />
+      <CopyInput label="API URL" value={config?.apiUrl ?? '...'} />
     </>
   )
 }

frontend/src/pages/TrackPage/TrackMap.tsx

@@ -7,7 +7,6 @@ import {Fill, Stroke, Style, Text, Circle} from 'ol/style'
 
 import {Map} from 'components'
 import type {TrackData, TrackPoint} from 'types'
-import config from 'config.json'
 
 const isValidTrackPoint = (point: TrackPoint): boolean => {
   const longitude = point.geometry?.coordinates?.[0]

frontend/src/pages/UploadPage.tsx

@@ -6,7 +6,7 @@ import {Link} from 'react-router-dom'
 import {FileUploadField, Page} from 'components'
 import type {Track} from 'types'
 import api from 'api'
-import config from '../config.json'
+import configPromise from 'config'
 
 function isSameFile(a: File, b: File) {
   return a.name === b.name && a.size === b.size
@@ -56,34 +56,41 @@ export function FileUploadStatus({
 
   React.useEffect(
     () => {
-      const formData = new FormData()
-      formData.append('body', file)
+      let xhr
 
-      const xhr = new XMLHttpRequest()
+      async function _work() {
+        const formData = new FormData()
+        formData.append('body', file)
 
-      const onProgress = (e) => {
-        const progress = (e.loaded || 0) / (e.total || 1)
-        setProgress(progress)
-      }
+        xhr = new XMLHttpRequest()
 
-      const onLoad = (e) => {
-        onComplete(id, xhr.response)
-      }
+        const onProgress = (e) => {
+          const progress = (e.loaded || 0) / (e.total || 1)
+          setProgress(progress)
+        }
 
-      xhr.responseType = 'json'
-      xhr.onload = onLoad
-      xhr.upload.onprogress = onProgress
-      if (slug) {
-        xhr.open('PUT', `${config.apiUrl}/api/tracks/${slug}`)
-      } else {
-        xhr.open('POST', `${config.apiUrl}/api/tracks`)
-      }
+        const onLoad = (e) => {
+          onComplete(id, xhr.response)
+        }
+
+        xhr.responseType = 'json'
+        xhr.onload = onLoad
+        xhr.upload.onprogress = onProgress
+
+        const config = await configPromise
+        if (slug) {
+          xhr.open('PUT', `${config.apiUrl}/api/tracks/${slug}`)
+        } else {
+          xhr.open('POST', `${config.apiUrl}/api/tracks`)
+        }
+
+        const accessToken = await api.getValidAccessToken()
 
-      api.getValidAccessToken().then((accessToken) => {
         xhr.setRequestHeader('Authorization', accessToken)
         xhr.send(formData)
-      })
+      }
 
+      _work()
       return () => xhr.abort()
     },
     // eslint-disable-next-line react-hooks/exhaustive-deps