software caching thumbnails in javascript

web/src/components/AuthenticatedImage.vue

@@ -7,7 +7,7 @@
 
 <script>
 
-import {mapActions} from "vuex";
+import {mapActions, mapGetters, mapMutations} from "vuex";
 
 export default {
     name: "AuthenticatedImage",
@@ -16,6 +16,7 @@ export default {
             type: String,
             required: true
         },
+        cached: Boolean
     },
     data() {
         return {
@@ -23,21 +24,37 @@ export default {
             servers: []
         }
     },
+    computed: {
+        ...mapGetters(['getThumbnail']),
+    },
     methods: {
         ...mapActions(['fetchImage']),
-        loadImage() {
-            this.fetchImage(this.src).then((response) => {
-                const mime_type = response.headers.get("content-type");
-                response.arrayBuffer().then((buf) => {
-                    const base64 = btoa(new Uint8Array(buf)
-                        .reduce((data, byte) => data + String.fromCharCode(byte), ""));
-                    this.image_data = "data:" + mime_type + ";base64," + base64;
+        ...mapMutations(['setThumbnail']),
+        async loadImage() {
+            const response = await this.fetchImage(this.src);
+            const mime_type = response.headers.get("content-type");
+            const buf = await response.arrayBuffer();
+            const base64 = btoa(new Uint8Array(buf)
+                .reduce((data, byte) => data + String.fromCharCode(byte), ""));
+            this.image_data = "data:" + mime_type + ";base64," + base64;
+            if (this.cached)
+                this.setThumbnail({
+                    url: this.src,
+                    data: this.image_data
                 });
-            })
         }
     },
     mounted() {
-        this.loadImage();
+        setTimeout(() => {
+            if (this.cached) {
+                const c = this.getThumbnail(this.src);
+                if (c) {
+                    this.image_data = c;
+                    return;
+                }
+            }
+            this.loadImage();
+        }, 0);
     }
 }
 </script>

web/src/components/TimelineMail.vue

@@ -25,8 +25,8 @@
                 <ul>
                     <li v-for="attachment in item.attachments" @click="openLightboxModalWith(attachment)">
                         <AuthenticatedImage :src="`/media/2/256/${attachment.hash}/`" :alt="attachment.name"
-                                            v-if="attachment.mime_type.startsWith('image/')"/>
-                        <AuthenticatedDataLink :href="`/media/2/256/${attachment.hash}/`" :download="attachment.name"
+                                            v-if="attachment.mime_type.startsWith('image/')" cached/>
+                        <AuthenticatedDataLink :href="`/media/2/${attachment.hash}/`" :download="attachment.name"
                                                v-else/>
                     </li>
                 </ul>

web/src/persistent-state-plugin/index.js

@@ -0,0 +1,71 @@
+import {isProxy, toRaw} from 'vue';
+
+export default (config) => (store) => {
+    if (!('isLoadedKey' in config)) {
+        throw new Error("isLoadedKey not defined in config");
+    }
+
+    const initialize = () => {
+        config.state.forEach(k => {
+            try {
+                if (config.debug) console.log("localStorage init", k, localStorage.getItem(config.prefix + k));
+                const parsed = JSON.parse(localStorage.getItem(config.prefix + k));
+                if (parsed !== store.state[k] && parsed !== null) {
+                    store.state[k] = parsed;
+                } else {
+                    if (config.debug) console.log("localStorage not loaded", k, localStorage.getItem(config.prefix + k));
+                }
+            } catch (e) {
+                if (config.debug) console.log("localStorage parse error", k, e);
+            }
+        });
+        store.state[config.isLoadedKey] = true;
+    }
+
+    const reload = initialize;
+
+    if (store.state[config.isLoadedKey] !== true)
+        initialize();
+
+    addEventListener('storage', reload);
+
+    if ('state' in config) {
+        config.state.forEach((member) => {
+            store.watch((state, getters) => state[member], (newValue, oldValue) => {
+                try {
+                    if (config.debug) console.log('watch', member,
+                        isProxy(newValue) ? toRaw(newValue) : newValue,
+                        isProxy(oldValue) ? toRaw(oldValue) : oldValue);
+                    const key = config.prefix + member;
+                    const encoded = JSON.stringify(isProxy(newValue) ? toRaw(newValue) : newValue);
+                    if (encoded !== localStorage.getItem(key)) {
+                        if (config.debug) console.log("localStorage replace", member, localStorage.getItem(key), encoded);
+                        if (newValue === null)
+                            localStorage.removeItem(key);
+                        else
+                            localStorage.setItem(key, encoded);
+                    } else {
+                        if (config.debug) console.log("localStorage not saved", member, localStorage.getItem(key), encoded);
+                    }
+                } catch (e) {
+                    if (config.debug) console.log("localsorage save error", member, e);
+                }
+            });
+        });
+    }
+
+    if ('clearingMutation' in config) {
+        store.subscribe((mutation, state) => {
+            if (mutation.type === config.clearingMutation) {
+                removeEventListener('storage', reload)
+                for (let key in config.state) {
+                    localStorage.removeItem(config.prefix + key);
+                }
+                for (let key in config.state) {
+                    store.state[key] = null;
+                }
+                addEventListener('storage', reload)
+            }
+        });
+    }
+};

web/src/store.js

@@ -5,6 +5,8 @@ import * as base64 from 'base-64';
 import * as utf8 from 'utf8';
 import {ticketStateColorLookup, ticketStateIconLookup, http} from "@/utils";
 
+import persistentStatePlugin from "@/persistent-state-plugin";
+
 const store = createStore({
     state: {
         keyIncrement: 0,
@@ -17,10 +19,8 @@ const store = createStore({
         users: [],
         groups: [],
         state_options: [],
-        lastEvent: localStorage.getItem('lf_lastEvent') || '37C3',
-        lastUsed: JSON.parse(localStorage.getItem('lf_lastUsed') || '{}'),
+        lastEvent: '37C3',
         remember: false,
-
         user: {
             username: null,
             password: null,
@@ -29,7 +29,8 @@ const store = createStore({
             expiry: null,
         },
 
-        local_loaded: false,
+        thumbnailCache: {},
+        persistent_loaded: false,
         showAddBoxModal: false,
     },
     getters: {
@@ -38,8 +39,10 @@ const store = createStore({
         getActiveView: state => router.currentRoute.value.name || 'items',
         getFilters: state => router.currentRoute.value.query,
         getBoxes: state => state.loadedBoxes,
-        checkPermission: state => (event, perm) => state.user.permissions.includes(`${event}:${perm}`) || state.user.permissions.includes(`*:${perm}`),
-        hasPermissions: state => state.user.permissions.length > 0,
+        checkPermission: state => (event, perm) => state.user.permissions &&
+            (state.user.permissions.includes(`${event}:${perm}`) || state.user.permissions.includes(`*:${perm}`)),
+        hasPermissions: state => state.user.permissions && state.user.permissions.length > 0,
+        activeUser: state => state.user.username || 'anonymous',
         stateInfo: state => (slug) => {
             const obj = state.state_options.filter((s) => s.value === slug)[0];
             if (obj) {
@@ -67,27 +70,18 @@ const store = createStore({
                 return 'tasks';
         },
         isLoggedIn(state) {
-            if (!state.local_loaded) {
-                state.remember = localStorage.getItem('remember') === 'true';
-                state.user.username = localStorage.getItem('user');
-                //state.password = localStorage.getItem('password');
-                state.user.permissions = JSON.parse(localStorage.getItem('permissions') || '[]');
-                state.user.token = localStorage.getItem('token');
-                state.user.expiry = localStorage.getItem('token_expiry');
-                state.local_loaded = true;
-            }
-
             return state.user && state.user.username !== null && state.user.token !== null;
         },
+        getThumbnail: (state) => (url) => {
+            if (!url) return null;
+            if (!(url in state.thumbnailCache))
+                return null;
+            return state.thumbnailCache[url];
+        },
     },
     mutations: {
-        updateLastUsed(state, diff) {
-            state.lastUsed = {...state.lastUsed, ...diff};
-            localStorage.setItem('lf_lastUsed', JSON.stringify(state.lastUsed));
-        },
         updateLastEvent(state, slug) {
             state.lastEvent = slug;
-            localStorage.setItem('lf_lastEvent', slug);
         },
         replaceEvents(state, events) {
             state.events = events;
@@ -147,29 +141,21 @@ const store = createStore({
         },
         setRemember(state, remember) {
             state.remember = remember;
-            localStorage.setItem('remember', remember);
         },
         setUser(state, user) {
             state.user.username = user;
-            if (user)
-                localStorage.setItem('user', user);
         },
         setPassword(state, password) {
             state.user.password = password;
         },
         setPermissions(state, permissions) {
             state.user.permissions = permissions;
-            if (permissions)
-                localStorage.setItem('permissions', JSON.stringify(permissions));
         },
         setToken(state, {token, expiry}) {
             const user = {...state.user};
             user.token = token;
             user.expiry = expiry;
             state.user = user;
-            if (token)
-                localStorage.setItem('token', token);
-            localStorage.setItem('token_expiry', expiry);
         },
         setUserInfo(state, user) {
             state.user = user;
@@ -183,9 +169,12 @@ const store = createStore({
             user.permissions = null;
             state.user = user;
         },
+        setThumbnail(state, {url, data}) {
+            state.thumbnailCache[url] = data;
+        },
     },
     actions: {
-        async login({commit, dispatch, state}, {username, password, remember}) {
+        async login({commit}, {username, password, remember}) {
             commit('setRemember', remember);
             try {
                 const data = await fetch('/api/2/login/', {
@@ -195,10 +184,8 @@ const store = createStore({
                     credentials: 'omit'
                 }).then(r => r.json())
                 if (data && data.token) {
-                    commit('setToken', data);
-                    commit('setUser', username);
-                    commit('setPassword', password);
-                    dispatch('afterLogin');
+                    const {data: {permissions}} = await http.get('/2/self/', data.token);
+                    commit('setUserInfo', {...data, permissions, username, password});
                     return true;
                 } else {
                     return false;
@@ -372,10 +359,21 @@ const store = createStore({
             commit('updateTicket', data);
         }
     },
+    plugins: [
+        persistentStatePlugin({ // TODO change remember to some kind of enable field
+            prefix: "lf_",
+            debug: false,
+            isLoadedKey: "persistent_loaded",
+            state: [
+                "remember",
+                "user",
+                "events",
+            ]
+        }),
+    ],
 });
 
 store.watch((state) => state.user, (user) => {
-    console.log('user changed', user);
     if (store.getters.isLoggedIn) {
         if (router.currentRoute.value.name === 'login' && router.currentRoute.value.query.redirect)
             router.push(router.currentRoute.value.query.redirect);

web/src/views/Empty.vue

@@ -4,9 +4,16 @@
             <div class="col-xl-8 offset-xl-2">
                 <div class="card bg-dark text-light mb-2" id="filters">
                     <div class="card-header">
-                        <h3 class="text-center">User: {{user}}</h3>
+                        <h3 class="text-center">User: {{ activeUser }}</h3>
                     </div>
-                    <div class="card-body">
+                    <div class="card-body" v-if="hasPermissions">
+                        <p>Your Account is activated. Got to
+                            <router-link :to="{name: 'items', params: {event: getEventSlug}}">Items</router-link>
+                            or
+                            <router-link :to="{name: 'tickets', params: {event: getEventSlug}}">Tickets</router-link>
+                        </p>
+                    </div>
+                    <div class="card-body" v-else>
                         <p>Your Account is not yet activated. Please contact an admin.</p>
                     </div>
                 </div>
@@ -16,11 +23,13 @@
 </template>
 
 <script>
-import {mapState} from "vuex";
+import {mapGetters, mapState} from "vuex";
 
 export default {
     name: 'Empty',
-    computed: mapState(['user']),
+    computed: {
+        ...mapGetters(['hasPermissions', 'getEventSlug', 'activeUser']),
+    },
 };
 </script>
 

web/src/views/Items.vue

@@ -45,7 +45,7 @@
             v-slot="{ item }"
             @itemActivated="openLightboxModalWith($event)"
         >
-            <AuthenticatedImage v-if="item.file"
+            <AuthenticatedImage v-if="item.file" cached
                                 :src="`/media/2/256/${item.file}/`"
                                 class="card-img-top img-fluid"
             />