Don't use localStorage when the browser doesn't support it

CHANGELOG.md

@@ -10,6 +10,7 @@ All notable changes to this project will be documented in this file.
 
 ### Fixed
 - Fix weekly report time range plausible/analytics#951
+- Make sure embedded dashboards can run when user has blocked third-party cookies plausible/analytics#971
 
 ### Removed
 - Removes AppSignal monitoring package

assets/js/dashboard/query.js

@@ -1,6 +1,7 @@
 import React from 'react'
 import { Link, withRouter } from 'react-router-dom'
 import {formatDay, formatMonthYYYY, nowForSite, parseUTCDate} from './date'
+import * as storage from './storage'
 
 const PERIODS = ['realtime', 'day', 'month', '7d', '30d', '6mo', '12mo', 'custom']
 
@@ -10,9 +11,9 @@ export function parseQuery(querystring, site) {
   const periodKey = `period__${  site.domain}`
 
   if (PERIODS.includes(period)) {
-    if (period !== 'custom' && period !== 'realtime') window.localStorage[periodKey] = period
-  } else if (window.localStorage[periodKey]) {
-      period = window.localStorage[periodKey]
+    if (period !== 'custom' && period !== 'realtime') storage.setItem(periodKey, period)
+  } else if (storage.getItem(periodKey)) {
+      period = storage.getItem(periodKey)
     } else {
       period = '30d'
     }

assets/js/dashboard/stats/conversions/prop-breakdown.js

@@ -1,6 +1,7 @@
 import React from 'react';
 import { Link } from 'react-router-dom'
 
+import * as storage from '../../storage'
 import Bar from '../bar'
 import numberFormatter from '../../number-formatter'
 import * as api from '../../api'
@@ -10,7 +11,7 @@ export default class PropertyBreakdown extends React.Component {
     super(props)
     let propKey = props.goal.prop_names[0]
     this.storageKey = 'goalPropTab__' + props.site.domain + props.goal.name
-    const storedKey = window.localStorage[this.storageKey]
+    const storedKey = storage.getItem(this.storageKey)
     if (props.goal.prop_names.includes(storedKey)) {
       propKey = storedKey
     }
@@ -70,7 +71,7 @@ export default class PropertyBreakdown extends React.Component {
   }
 
   changePropKey(newKey) {
-    window.localStorage[this.storageKey] = newKey
+    storage.setItem(this.storageKey, newKey)
     this.setState({propKey: newKey, loading: true}, this.fetchPropBreakdown)
   }
 

assets/js/dashboard/stats/devices/index.js

@@ -1,6 +1,7 @@
 import React from 'react';
 import { Link } from 'react-router-dom'
 
+import * as storage from '../../storage'
 import LazyLoader from '../../lazy-loader'
 import Browsers from './browsers'
 import OperatingSystems from './operating-systems'
@@ -117,7 +118,7 @@ export default class Devices extends React.Component {
   constructor(props) {
     super(props)
     this.tabKey = 'deviceTab__' + props.site.domain
-    const storedTab = window.localStorage[this.tabKey]
+    const storedTab = storage.getItem(this.tabKey)
     this.state = {
       mode: storedTab || 'size'
     }
@@ -135,7 +136,7 @@ export default class Devices extends React.Component {
 
   setMode(mode) {
     return () => {
-      window.localStorage[this.tabKey] = mode
+      storage.setItem(this.tabKey, mode)
       this.setState({mode})
     }
   }

assets/js/dashboard/stats/pages/index.js

@@ -1,6 +1,7 @@
 import React from 'react';
 import { Link } from 'react-router-dom'
 
+import * as storage from '../../storage'
 import Visits from './pages'
 import EntryPages from './entry-pages'
 import ExitPages from './exit-pages'
@@ -16,7 +17,7 @@ export default class Pages extends React.Component {
   constructor(props) {
     super(props)
     this.tabKey = 'pageTab__' + props.site.domain
-    const storedTab = window.localStorage[this.tabKey]
+    const storedTab = storage.getItem(this.tabKey)
     this.state = {
       mode: storedTab || 'pages'
     }
@@ -34,7 +35,7 @@ export default class Pages extends React.Component {
 
   setMode(mode) {
     return () => {
-      window.localStorage[this.tabKey] = mode
+      storage.setItem(this.tabKey, mode)
       this.setState({mode})
     }
   }

assets/js/dashboard/stats/sources/source-list.js

@@ -2,6 +2,7 @@ import React from 'react';
 import { Link } from 'react-router-dom'
 import FlipMove from 'react-flip-move';
 
+import * as storage from '../../storage'
 import FadeIn from '../../fade-in'
 import Bar from '../bar'
 import MoreLink from '../more-link'
@@ -210,15 +211,15 @@ export default class SourceList extends React.Component {
   constructor(props) {
     super(props)
     this.tabKey = 'sourceTab__' + props.site.domain
-    const storedTab = window.localStorage[this.tabKey]
+    const storedTab = storage.getItem(this.tabKey)
     this.state = {
       tab: storedTab || 'all'
     }
   }
 
   setTab(tab) {
     return () => {
-      window.localStorage[this.tabKey] = tab
+      storage.setItem(this.tabKey, tab)
       this.setState({tab})
     }
   }

assets/js/dashboard/storage.js

@@ -0,0 +1,35 @@
+// This module checks if localStorage is available and uses it for persistent frontend storage
+// if possible. Localstorage can be blocked by browsers when people block third-party cookies and
+// the dashboard is running in embedded mode. In those cases, store stuff in a regular object instead.
+
+const memStore = {}
+
+// https://stackoverflow.com/a/16427747
+function testLocalStorageAvailability(){
+  try {
+    const testItem = 'test';
+    localStorage.setItem(testItem, testItem);
+    localStorage.removeItem(testItem);
+    return true;
+  } catch(e) {
+    return false;
+  }
+}
+
+const isLocalStorageAvailable = testLocalStorageAvailability()
+
+export function setItem(key, value) {
+  if (isLocalStorageAvailable) {
+    window.localStorage.setItem(key, value)
+  } else {
+    memStore[key] = value
+  }
+}
+
+export function getItem(key) {
+  if (isLocalStorageAvailable) {
+    return window.localStorage.getItem(key)
+  } else {
+    return memStore[key]
+  }
+}