feat: |Doc| use shadow DOM render mail html (#604)

frontend/src/components/MailBox.vue

@@ -7,6 +7,7 @@ import { CloudDownloadRound, ReplyFilled, ForwardFilled } from '@vicons/material
 import { useIsMobile } from '../utils/composables'
 import { processItem, getDownloadEmlUrl } from '../utils/email-parser'
 import { utcToLocalDate } from '../utils';
+import ShadowHtmlComponent from "./ShadowHtmlComponent.vue";
 
 const message = useMessage()
 const isMobile = useIsMobile()
@@ -171,7 +172,7 @@ const refresh = async () => {
   }
 };
 
-const backFirstPageAndRefresh =  async () =>{
+const backFirstPageAndRefresh = async () => {
   page.value = 1;
   await refresh();
 }
@@ -380,7 +381,7 @@ onBeforeUnmount(() => {
       <n-split class="left" direction="horizontal" :max="0.75" :min="0.25" :default-size="mailboxSplitSize"
         :on-update:size="onSpiltSizeChange">
         <template #1>
-          <div style="overflow: auto; height: 80vh;">
+          <div style="overflow: auto; min-height: 50vh; max-height: 100vh;">
             <n-list hoverable clickable>
               <n-list-item v-for="row in data" v-bind:key="row.id" @click="() => clickRow(row)"
                 :class="mailItemClass(row)">
@@ -396,10 +397,14 @@ onBeforeUnmount(() => {
                       {{ utcToLocalDate(row.created_at, useUTCDate) }}
                     </n-tag>
                     <n-tag type="info">
-                      FROM: {{ row.source }}
+                      <n-ellipsis style="max-width: 240px;">
+                        {{ showEMailTo ? "FROM: " + row.source : row.source }}
+                      </n-ellipsis>
                     </n-tag>
                     <n-tag v-if="showEMailTo" type="info">
-                      TO: {{ row.address }}
+                      <n-ellipsis style="max-width: 240px;">
+                        TO: {{ row.address }}
+                      </n-ellipsis>
                     </n-tag>
                   </template>
                 </n-thing>
@@ -460,7 +465,7 @@ onBeforeUnmount(() => {
             <iframe v-else-if="useIframeShowMail" :srcdoc="curMail.message"
               style="margin-top: 10px;width: 100%; height: 100%;">
             </iframe>
-            <div v-else v-html="curMail.message" style="margin-top: 10px;"></div>
+            <ShadowHtmlComponent v-else :htmlContent="curMail.message" style="margin-top: 10px;" />
           </n-card>
           <n-card :bordered="false" embedded class="mail-item" v-else>
             <n-result status="info" :title="t('pleaseSelectMail')">
@@ -498,7 +503,7 @@ onBeforeUnmount(() => {
                   {{ utcToLocalDate(row.created_at, useUTCDate) }}
                 </n-tag>
                 <n-tag type="info">
-                  FROM: {{ row.source }}
+                  {{ showEMailTo ? "FROM: " + row.source : row.source }}
                 </n-tag>
                 <n-tag v-if="showEMailTo" type="info">
                   TO: {{ row.address }}
@@ -560,7 +565,7 @@ onBeforeUnmount(() => {
             <iframe v-else-if="useIframeShowMail" :srcdoc="curMail.message"
               style="margin-top: 10px;width: 100%; height: 100%;">
             </iframe>
-            <div v-else v-html="curMail.message" style="margin-top: 10px;"></div>
+            <ShadowHtmlComponent :key="curMail.id" v-else :htmlContent="curMail.message" style="margin-top: 10px;" />
           </n-card>
         </n-drawer-content>
       </n-drawer>

frontend/src/components/ShadowHtmlComponent.vue

@@ -0,0 +1,75 @@
+<template>
+    <div v-if="useFallback" v-html="htmlContent"></div>
+    <div v-else ref="shadowHost"></div>
+</template>
+
+<script setup>
+import { ref, watch, onMounted, onBeforeUnmount, defineProps } from 'vue';
+
+const props = defineProps({
+    htmlContent: {
+        type: String,
+        required: true,
+    },
+});
+
+const shadowHost = ref(null);
+let shadowRoot = null;
+const useFallback = ref(false);
+
+/**
+ * Renders content into Shadow DOM with fallback to v-html
+ */
+const renderShadowDom = () => {
+    if (!shadowHost.value && !useFallback.value) return;
+
+    try {
+        // Don't attempt to use Shadow DOM if already in fallback mode
+        if (useFallback.value) return;
+
+        // Initialize Shadow DOM if not already created
+        if (!shadowRoot && shadowHost.value) {
+            try {
+                shadowRoot = shadowHost.value.attachShadow({ mode: 'open' });
+            } catch (error) {
+                console.warn('Shadow DOM not supported, falling back to v-html:', error);
+                useFallback.value = true;
+                return;
+            }
+        }
+
+        // Update content if Shadow DOM exists
+        if (shadowRoot) {
+            shadowRoot.innerHTML = props.htmlContent;
+        }
+    } catch (error) {
+        console.error('Failed to render Shadow DOM, falling back to v-html:', error);
+        useFallback.value = true;
+    }
+};
+
+// Initial render when component is mounted
+onMounted(() => {
+    // Check if Shadow DOM is supported in this browser
+    if (typeof Element.prototype.attachShadow !== 'function') {
+        console.warn('Shadow DOM is not supported in this browser, using v-html fallback');
+        useFallback.value = true;
+        return;
+    }
+
+    renderShadowDom();
+});
+
+// Clean up resources when component is unmounted
+onBeforeUnmount(() => {
+    if (shadowRoot) {
+        shadowRoot.innerHTML = '';
+    }
+    shadowRoot = null;
+});
+
+// Update Shadow DOM when htmlContent changes
+watch(() => props.htmlContent, () => {
+    renderShadowDom();
+}, { flush: 'post' });
+</script>