Storing imported tracks in local "forage".

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,
+        };
+      }
     },
   },
 });