Storing imported tracks in local "forage".

src/App.tsx

@@ -22,13 +22,16 @@ import '@ionic/react/css/display.css';
 import './theme/variables.css';
 
 import Map from './components/map/map';
+import DbContextProvider from './db/db-context-provider';
 
 setupIonicReact();
 
 const App: React.FC = () => (
   <IonApp>
     <Provider store={store}>
-      <Map />
+      <DbContextProvider>
+        <Map />
+      </DbContextProvider>
     </Provider>
   </IonApp>
 );

src/components/map/gpx-import.tsx

@@ -14,7 +14,7 @@ const GpxImport: React.FC<{}> = () => {
 
   const onChangeHandler = (event: any) => {
     console.log('On change handler');
-    const file = event.target.files[0];
+    const file: File = event.target.files[0];
     const fileReader = new FileReader();
     fileReader.readAsText(file);
 
@@ -24,7 +24,18 @@ const GpxImport: React.FC<{}> = () => {
         // this will then display a text file
         console.log(fileReader.result);
         const track = GPX.parse(fileReader.result);
-        dispatch(tracksActions.push(JSON.parse(JSON.stringify(track))));
+        dispatch(
+          tracksActions.push({
+            track: JSON.parse(JSON.stringify(track)),
+            metadata: {
+              lastModified: new Date(file.lastModified).toISOString(),
+              importDate: new Date().toISOString(),
+              name: file.name,
+              size: file.size,
+              type: file.type,
+            },
+          })
+        );
       },
       false
     );

src/components/map/track.tsx

@@ -1,11 +1,31 @@
-import React from 'react';
+import React, { useContext, useEffect } from 'react';
 
+import { DbContext } from '../../db/db-context-provider';
 import { lat2tile, lon2tile } from '../../lib/geo';
 import { zoom0 } from '../../store/map';
 
-const Track: React.FC<{ track: any }> = (props) => {
-  const trkseg = props.track.trk[0].trkseg[0];
+const Track: React.FC<{ track: any; id: string }> = (props) => {
+  const dbContext = useContext(DbContext);
 
+  useEffect(() => {
+    const store = dbContext.tracksStore;
+    const checkDb = async () => {
+      store.getItem(props.id).then((value) => {
+        if (value === null) {
+          store.setItem(props.id, props.track).then((value) => {
+            console.log(
+              `Track ${props.id} saved in the ${store.driver()} Database.`
+            );
+          });
+        }
+      });
+    };
+    if (dbContext.ready) {
+      checkDb();
+    }
+  }, [dbContext, props]);
+
+  const trkseg = props.track.track.trk[0].trkseg[0];
   const d = trkseg.trkpt.reduce(
     (previous: string, current: any, index: number) => {
       const action = index === 0 ? 'M' : index === 1 ? 'L' : '';

src/components/map/tracks.tsx

@@ -1,33 +1,15 @@
-import React, { Fragment, useEffect } from 'react';
+import React, { Fragment, useContext } from 'react';
 
 import { useSelector } from 'react-redux';
 
-import { Drivers, Storage } from '@ionic/storage';
-import * as CordovaSQLiteDriver from 'localforage-cordovasqlitedriver';
-
 import Track from './track';
 
-var store: Storage;
-
 const Tracks: React.FC<{}> = () => {
-  useEffect(() => {
-    store = new Storage({
-      driverOrder: [
-        CordovaSQLiteDriver._driver,
-        Drivers.IndexedDB,
-        Drivers.LocalStorage,
-      ],
-    });
-    store
-      .defineDriver(CordovaSQLiteDriver)
-      .then(() => console.log('CordovaSQLiteDriver registered'));
-  }, []);
-
   const tracks = useSelector((state: { tracks: any }) => state.tracks.tracks);
   return (
     <Fragment>
       {Object.keys(tracks).map((key: any) => (
-        <Track key={key} track={tracks[key]} />
+        <Track key={key} id={key} track={tracks[key]} />
       ))}
     </Fragment>
   );

src/db/db-context-provider.tsx

@@ -0,0 +1,40 @@
+import react, { useEffect, useState } from 'react';
+
+import * as CordovaSQLiteDriver from 'localforage-cordovasqlitedriver';
+import localforage from 'localforage';
+
+const initialDbContext = { ready: false, tracksStore: localforage };
+export const DbContext = react.createContext(initialDbContext);
+
+const DbContextProvider: react.FC<{
+  children?: JSX.Element;
+}> = (props: { children?: JSX.Element }) => {
+  const [store, setStore] = useState(localforage);
+  const [ready, setReady] = useState(false);
+
+  useEffect(() => {
+    const config = {
+      name: 'dyomedea',
+      driver: [
+        CordovaSQLiteDriver._driver,
+        localforage.INDEXEDDB,
+        localforage.WEBSQL,
+        localforage.LOCALSTORAGE,
+      ],
+    };
+    const newStore = localforage.createInstance({
+      storeName: 'tracks',
+      ...config,
+    });
+    setStore(newStore);
+    setReady(true);
+  }, []);
+
+  return (
+    <DbContext.Provider value={{ ready, tracksStore: store }}>
+      {props.children}
+    </DbContext.Provider>
+  );
+};
+
+export default DbContextProvider;

src/store/tracks.ts

@@ -1,5 +1,12 @@
 import { createSlice } from '@reduxjs/toolkit';
 
+import {
+  Sha256,
+  Sha512,
+  string_to_bytes,
+  bytes_to_base64,
+} from '@openpgp/asmcrypto.js';
+
 interface TracksState {
   tracks: { [index: string]: any };
 }
@@ -13,10 +20,29 @@ const tracksSlice = createSlice({
   initialState: initialTracks,
   reducers: {
     add: (state, action) => {
-      state.tracks[action.payload.id] = action.payload.track;
+      const { id, ...data } = action.payload;
+      state.tracks[action.payload.id] = data;
     },
     push: (state, action) => {
-      state.tracks[crypto.randomUUID()] = action.payload;
+      const sha = new Sha512();
+      const result = sha
+        .process(string_to_bytes(JSON.stringify(action.payload.track)))
+        .finish().result;
+      var id;
+      if (result === null) {
+        console.log(`Can't hash`);
+        id = crypto.randomUUID();
+      } else {
+        id = bytes_to_base64(result);
+        console.log(`Digest: ${id}`);
+      }
+      if (state.tracks.hasOwnProperty(id)) {
+        console.log('Track had already been imported');
+      } else {
+        state.tracks[id] = {
+          ...action.payload,
+        };
+      }
     },
   },
 });