Implement remote account resolution

48 files changed, 346 insertions, 174 deletions

diff --git a/src/web/app/ch/tags/channel.tag b/src/web/app/ch/tags/channel.tag
index face824cfc..dc4b8e1426 100644
--- a/src/web/app/ch/tags/channel.tag
+++ b/src/web/app/ch/tags/channel.tag
@@ -165,10 +165,10 @@
 <mk-channel-post>
 	<header>
 		<a class="index" @click="reply">{ post.index }:</a>
-		<a class="name" href={ _URL_ + '/@' + post.user.username }><b>{ post.user.name }</b></a>
+		<a class="name" href={ _URL_ + '/@' + acct }><b>{ post.user.name }</b></a>
 		<mk-time time={ post.created_at }/>
 		<mk-time time={ post.created_at } mode="detail"/>
-		<span>ID:<i>{ post.user.username }</i></span>
+		<span>ID:<i>{ acct }</i></span>
 	</header>
 	<div>
 		<a v-if="post.reply">&gt;&gt;{ post.reply.index }</a>
@@ -229,8 +229,11 @@
 
 	</style>
 	<script lang="typescript">
+		import getAcct from '../../../../common/user/get-acct';
+
 		this.post = this.opts.post;
 		this.form = this.opts.form;
+		this.acct = getAcct(this.post.user);
 
 		this.reply = () => {
 			this.form.update({
diff --git a/src/web/app/common/views/components/autocomplete.vue b/src/web/app/common/views/components/autocomplete.vue
index 6d7d5cd1b1..8afa291e3c 100644
--- a/src/web/app/common/views/components/autocomplete.vue
+++ b/src/web/app/common/views/components/autocomplete.vue
@@ -4,7 +4,7 @@
 		<li v-for="user in users" @click="complete(type, user)" @keydown="onKeydown" tabindex="-1">
 			<img class="avatar" :src="`${user.avatar_url}?thumbnail&size=32`" alt=""/>
 			<span class="name">{{ user.name }}</span>
-			<span class="username">@{{ user.username }}</span>
+			<span class="username">@{{ getAcct(user) }}</span>
 		</li>
 	</ol>
 	<ol class="emojis" ref="suggests" v-if="emojis.length > 0">
@@ -21,6 +21,7 @@
 import Vue from 'vue';
 import * as emojilib from 'emojilib';
 import contains from '../../../common/scripts/contains';
+import getAcct from '../../../../../common/user/get-acct';
 
 const lib = Object.entries(emojilib.lib).filter((x: any) => {
 	return x[1].category != 'flags';
@@ -105,6 +106,7 @@ export default Vue.extend({
 		});
 	},
 	methods: {
+		getAcct,
 		exec() {
 			this.select = -1;
 			if (this.$refs.suggests) {
diff --git a/src/web/app/common/views/components/messaging-room.message.vue b/src/web/app/common/views/components/messaging-room.message.vue
index 647e39a756..5f2eb1ba86 100644
--- a/src/web/app/common/views/components/messaging-room.message.vue
+++ b/src/web/app/common/views/components/messaging-room.message.vue
@@ -1,6 +1,6 @@
 <template>
 <div class="message" :data-is-me="isMe">
-	<router-link class="avatar-anchor" :to="`/@${message.user.username}`" :title="message.user.username" target="_blank">
+	<router-link class="avatar-anchor" :to="`/@${acct}`" :title="acct" target="_blank">
 		<img class="avatar" :src="`${message.user.avatar_url}?thumbnail&size=80`" alt=""/>
 	</router-link>
 	<div class="content">
@@ -34,10 +34,14 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../common/user/get-acct';
 
 export default Vue.extend({
 	props: ['message'],
 	computed: {
+		acct() {
+			return getAcct(this.message.user);
+		},
 		isMe(): boolean {
 			return this.message.user_id == (this as any).os.i.id;
 		},
diff --git a/src/web/app/common/views/components/messaging.vue b/src/web/app/common/views/components/messaging.vue
index db60e9259a..88574b94d1 100644
--- a/src/web/app/common/views/components/messaging.vue
+++ b/src/web/app/common/views/components/messaging.vue
@@ -15,7 +15,7 @@
 				>
 					<img class="avatar" :src="`${user.avatar_url}?thumbnail&size=32`" alt=""/>
 					<span class="name">{{ user.name }}</span>
-					<span class="username">@{{ user.username }}</span>
+					<span class="username">@{{ getAcct(user) }}</span>
 				</li>
 			</ol>
 		</div>
@@ -24,7 +24,7 @@
 		<template>
 			<a v-for="message in messages"
 				class="user"
-				:href="`/i/messaging/${isMe(message) ? message.recipient.username : message.user.username}`"
+				:href="`/i/messaging/${getAcct(isMe(message) ? message.recipient : message.user)}`"
 				:data-is-me="isMe(message)"
 				:data-is-read="message.is_read"
 				@click.prevent="navigate(isMe(message) ? message.recipient : message.user)"
@@ -34,7 +34,7 @@
 					<img class="avatar" :src="`${isMe(message) ? message.recipient.avatar_url : message.user.avatar_url}?thumbnail&size=64`" alt=""/>
 					<header>
 						<span class="name">{{ isMe(message) ? message.recipient.name : message.user.name }}</span>
-						<span class="username">@{{ isMe(message) ? message.recipient.username : message.user.username }}</span>
+						<span class="username">@{{ getAcct(isMe(message) ? message.recipient : message.user) }}</span>
 						<mk-time :time="message.created_at"/>
 					</header>
 					<div class="body">
@@ -51,6 +51,7 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../common/user/get-acct';
 
 export default Vue.extend({
 	props: {
@@ -92,6 +93,7 @@ export default Vue.extend({
 		(this as any).os.streams.messagingIndexStream.dispose(this.connectionId);
 	},
 	methods: {
+		getAcct,
 		isMe(message) {
 			return message.user_id == (this as any).os.i.id;
 		},
diff --git a/src/web/app/common/views/components/post-html.ts b/src/web/app/common/views/components/post-html.ts
index 56ee97d388..98da86617d 100644
--- a/src/web/app/common/views/components/post-html.ts
+++ b/src/web/app/common/views/components/post-html.ts
@@ -1,5 +1,6 @@
 import Vue from 'vue';
 import * as emojilib from 'emojilib';
+import getAcct from '../../../../../common/user/get-acct';
 import { url } from '../../../config';
 import MkUrl from './url.vue';
 
@@ -61,9 +62,9 @@ export default Vue.component('mk-post-html', {
 				case 'mention':
 					return (createElement as any)('a', {
 						attrs: {
-							href: `${url}/@${token.username}`,
+							href: `${url}/@${getAcct(token)}`,
 							target: '_blank',
-							dataIsMe: (this as any).i && (this as any).i.username == token.username
+							dataIsMe: (this as any).i && getAcct((this as any).i) == getAcct(token)
 						},
 						directives: [{
 							name: 'user-preview',
diff --git a/src/web/app/common/views/components/welcome-timeline.vue b/src/web/app/common/views/components/welcome-timeline.vue
index 062ccda324..7586e9264e 100644
--- a/src/web/app/common/views/components/welcome-timeline.vue
+++ b/src/web/app/common/views/components/welcome-timeline.vue
@@ -1,15 +1,15 @@
 <template>
 <div class="mk-welcome-timeline">
 	<div v-for="post in posts">
-		<router-link class="avatar-anchor" :to="`/@${post.user.username}`" v-user-preview="post.user.id">
+		<router-link class="avatar-anchor" :to="`/@${getAcct(post.user)}`" v-user-preview="post.user.id">
 			<img class="avatar" :src="`${post.user.avatar_url}?thumbnail&size=96`" alt="avatar"/>
 		</router-link>
 		<div class="body">
 			<header>
-				<router-link class="name" :to="`/@${post.user.username}`" v-user-preview="post.user.id">{{ post.user.name }}</router-link>
-				<span class="username">@{{ post.user.username }}</span>
+				<router-link class="name" :to="`/@${getAcct(post.user)}`" v-user-preview="post.user.id">{{ post.user.name }}</router-link>
+				<span class="username">@{{ getAcct(post.user) }}</span>
 				<div class="info">
-					<router-link class="created-at" :to="`/@${post.user.username}/${post.id}`">
+					<router-link class="created-at" :to="`/@${getAcct(post.user)}/${post.id}`">
 						<mk-time :time="post.created_at"/>
 					</router-link>
 				</div>
@@ -24,6 +24,7 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../common/user/get-acct';
 
 export default Vue.extend({
 	data() {
@@ -36,6 +37,7 @@ export default Vue.extend({
 		this.fetch();
 	},
 	methods: {
+		getAcct,
 		fetch(cb?) {
 			this.fetching = true;
 			(this as any).api('posts', {
diff --git a/src/web/app/desktop/script.ts b/src/web/app/desktop/script.ts
index 145cc45db2..b95e168544 100644
--- a/src/web/app/desktop/script.ts
+++ b/src/web/app/desktop/script.ts
@@ -49,7 +49,7 @@ init(async (launch) => {
 		routes: [
 			{ path: '/', name: 'index', component: MkIndex },
 			{ path: '/i/customize-home', component: MkHomeCustomize },
-			{ path: '/i/messaging/:username', component: MkMessagingRoom },
+			{ path: '/i/messaging/:user', component: MkMessagingRoom },
 			{ path: '/i/drive', component: MkDrive },
 			{ path: '/i/drive/folder/:folder', component: MkDrive },
 			{ path: '/selectdrive', component: MkSelectDrive },
diff --git a/src/web/app/desktop/views/components/friends-maker.vue b/src/web/app/desktop/views/components/friends-maker.vue
index 65adff7cec..eed15e0773 100644
--- a/src/web/app/desktop/views/components/friends-maker.vue
+++ b/src/web/app/desktop/views/components/friends-maker.vue
@@ -3,12 +3,12 @@
 	<p class="title">気になるユーザーをフォロー:</p>
 	<div class="users" v-if="!fetching && users.length > 0">
 		<div class="user" v-for="user in users" :key="user.id">
-			<router-link class="avatar-anchor" :to="`/@${user.username}`">
+			<router-link class="avatar-anchor" :to="`/@${getAcct(user)}`">
 				<img class="avatar" :src="`${user.avatar_url}?thumbnail&size=42`" alt="" v-user-preview="user.id"/>
 			</router-link>
 			<div class="body">
-				<router-link class="name" :to="`/@${user.username}`" v-user-preview="user.id">{{ user.name }}</router-link>
-				<p class="username">@{{ user.username }}</p>
+				<router-link class="name" :to="`/@${getAcct(user)}`" v-user-preview="user.id">{{ user.name }}</router-link>
+				<p class="username">@{{ getAcct(user) }}</p>
 			</div>
 			<mk-follow-button :user="user"/>
 		</div>
@@ -22,6 +22,8 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../common/user/get-acct';
+
 export default Vue.extend({
 	data() {
 		return {
@@ -35,6 +37,7 @@ export default Vue.extend({
 		this.fetch();
 	},
 	methods: {
+		getAcct,
 		fetch() {
 			this.fetching = true;
 			this.users = [];
diff --git a/src/web/app/desktop/views/components/messaging-room-window.vue b/src/web/app/desktop/views/components/messaging-room-window.vue
index 66a9aa0036..3735267811 100644
--- a/src/web/app/desktop/views/components/messaging-room-window.vue
+++ b/src/web/app/desktop/views/components/messaging-room-window.vue
@@ -8,12 +8,13 @@
 <script lang="ts">
 import Vue from 'vue';
 import { url } from '../../../config';
+import getAcct from '../../../../../common/user/get-acct';
 
 export default Vue.extend({
 	props: ['user'],
 	computed: {
 		popout(): string {
-			return `${url}/i/messaging/${this.user.username}`;
+			return `${url}/i/messaging/${getAcct(this.user)}`;
 		}
 	}
 });
diff --git a/src/web/app/desktop/views/components/notifications.vue b/src/web/app/desktop/views/components/notifications.vue
index 86cd1ba4f6..b48ffc1746 100644
--- a/src/web/app/desktop/views/components/notifications.vue
+++ b/src/web/app/desktop/views/components/notifications.vue
@@ -5,82 +5,82 @@
 			<div class="notification" :class="notification.type" :key="notification.id">
 				<mk-time :time="notification.created_at"/>
 				<template v-if="notification.type == 'reaction'">
-					<router-link class="avatar-anchor" :to="`/@${notification.user.username}`" v-user-preview="notification.user.id">
+					<router-link class="avatar-anchor" :to="`/@${getAcct(notification.user)}`" v-user-preview="notification.user.id">
 						<img class="avatar" :src="`${notification.user.avatar_url}?thumbnail&size=48`" alt="avatar"/>
 					</router-link>
 					<div class="text">
 						<p>
 							<mk-reaction-icon :reaction="notification.reaction"/>
-							<router-link :to="`/@${notification.user.username}`" v-user-preview="notification.user.id">{{ notification.user.name }}</router-link>
+							<router-link :to="`/@${getAcct(notification.user)}`" v-user-preview="notification.user.id">{{ notification.user.name }}</router-link>
 						</p>
-						<router-link class="post-ref" :to="`/@${notification.post.user.username}/${notification.post.id}`">
+						<router-link class="post-ref" :to="`/@${getAcct(notification.post.user)}/${notification.post.id}`">
 							%fa:quote-left%{{ getPostSummary(notification.post) }}%fa:quote-right%
 						</router-link>
 					</div>
 				</template>
 				<template v-if="notification.type == 'repost'">
-					<router-link class="avatar-anchor" :to="`/@${notification.post.user.username}`" v-user-preview="notification.post.user_id">
+					<router-link class="avatar-anchor" :to="`/@${getAcct(notification.post.user)}`" v-user-preview="notification.post.user_id">
 						<img class="avatar" :src="`${notification.post.user.avatar_url}?thumbnail&size=48`" alt="avatar"/>
 					</router-link>
 					<div class="text">
 						<p>%fa:retweet%
-							<router-link :to="`/@${notification.post.user.username}`" v-user-preview="notification.post.user_id">{{ notification.post.user.name }}</router-link>
+							<router-link :to="`/@${getAcct(notification.post.user)}`" v-user-preview="notification.post.user_id">{{ notification.post.user.name }}</router-link>
 						</p>
-						<router-link class="post-ref" :to="`/@${notification.post.user.username}/${notification.post.id}`">
+						<router-link class="post-ref" :to="`/@${getAcct(notification.post.user)}/${notification.post.id}`">
 							%fa:quote-left%{{ getPostSummary(notification.post.repost) }}%fa:quote-right%
 						</router-link>
 					</div>
 				</template>
 				<template v-if="notification.type == 'quote'">
-					<router-link class="avatar-anchor" :to="`/@${notification.post.user.username}`" v-user-preview="notification.post.user_id">
+					<router-link class="avatar-anchor" :to="`/@${getAcct(notification.post.user)}`" v-user-preview="notification.post.user_id">
 						<img class="avatar" :src="`${notification.post.user.avatar_url}?thumbnail&size=48`" alt="avatar"/>
 					</router-link>
 					<div class="text">
 						<p>%fa:quote-left%
-							<router-link :to="`/@${notification.post.user.username}`" v-user-preview="notification.post.user_id">{{ notification.post.user.name }}</router-link>
+							<router-link :to="`/@${getAcct(notification.post.user)}`" v-user-preview="notification.post.user_id">{{ notification.post.user.name }}</router-link>
 						</p>
-						<router-link class="post-preview" :to="`/@${notification.post.user.username}/${notification.post.id}`">{{ getPostSummary(notification.post) }}</router-link>
+						<router-link class="post-preview" :to="`/@${getAcct(notification.post.user)}/${notification.post.id}`">{{ getPostSummary(notification.post) }}</router-link>
 					</div>
 				</template>
 				<template v-if="notification.type == 'follow'">
-					<router-link class="avatar-anchor" :to="`/@${notification.user.username}`" v-user-preview="notification.user.id">
+					<router-link class="avatar-anchor" :to="`/@${getAcct(notification.user)}`" v-user-preview="notification.user.id">
 						<img class="avatar" :src="`${notification.user.avatar_url}?thumbnail&size=48`" alt="avatar"/>
 					</router-link>
 					<div class="text">
 						<p>%fa:user-plus%
-							<router-link :to="`/@${notification.user.username}`" v-user-preview="notification.user.id">{{ notification.user.name }}</router-link>
+							<router-link :to="`/@${getAcct(notification.user)}`" v-user-preview="notification.user.id">{{ notification.user.name }}</router-link>
 						</p>
 					</div>
 				</template>
 				<template v-if="notification.type == 'reply'">
-					<router-link class="avatar-anchor" :to="`/@${notification.post.user.username}`" v-user-preview="notification.post.user_id">
+					<router-link class="avatar-anchor" :to="`/@${getAcct(notification.post.user)}`" v-user-preview="notification.post.user_id">
 						<img class="avatar" :src="`${notification.post.user.avatar_url}?thumbnail&size=48`" alt="avatar"/>
 					</router-link>
 					<div class="text">
 						<p>%fa:reply%
-							<router-link :to="`/@${notification.post.user.username}`" v-user-preview="notification.post.user_id">{{ notification.post.user.name }}</router-link>
+							<router-link :to="`/@${getAcct(notification.post.user)}`" v-user-preview="notification.post.user_id">{{ notification.post.user.name }}</router-link>
 						</p>
-						<router-link class="post-preview" :to="`/@${notification.post.user.username}/${notification.post.id}`">{{ getPostSummary(notification.post) }}</router-link>
+						<router-link class="post-preview" :to="`/@${getAcct(notification.post.user)}/${notification.post.id}`">{{ getPostSummary(notification.post) }}</router-link>
 					</div>
 				</template>
 				<template v-if="notification.type == 'mention'">
-					<router-link class="avatar-anchor" :to="`/@${notification.post.user.username}`" v-user-preview="notification.post.user_id">
+					<router-link class="avatar-anchor" :to="`/@${getAcct(notification.post.user)}`" v-user-preview="notification.post.user_id">
 						<img class="avatar" :src="`${notification.post.user.avatar_url}?thumbnail&size=48`" alt="avatar"/>
 					</router-link>
 					<div class="text">
 						<p>%fa:at%
-							<router-link :to="`/@${notification.post.user.username}`" v-user-preview="notification.post.user_id">{{ notification.post.user.name }}</router-link>
+							<router-link :to="`/@${getAcct(notification.post.user)}`" v-user-preview="notification.post.user_id">{{ notification.post.user.name }}</router-link>
 						</p>
-						<a class="post-preview" :href="`/@${notification.post.user.username}/${notification.post.id}`">{{ getPostSummary(notification.post) }}</a>
+						<a class="post-preview" :href="`/@${getAcct(notification.post.user)}/${notification.post.id}`">{{ getPostSummary(notification.post) }}</a>
 					</div>
 				</template>
 				<template v-if="notification.type == 'poll_vote'">
-					<router-link class="avatar-anchor" :to="`/@${notification.user.username}`" v-user-preview="notification.user.id">
+					<router-link class="avatar-anchor" :to="`/@${getAcct(notification.user)}`" v-user-preview="notification.user.id">
 						<img class="avatar" :src="`${notification.user.avatar_url}?thumbnail&size=48`" alt="avatar"/>
 					</router-link>
 					<div class="text">
-						<p>%fa:chart-pie%<a :href="`/@${notification.user.username}`" v-user-preview="notification.user.id">{{ notification.user.name }}</a></p>
-						<router-link class="post-ref" :to="`/@${notification.post.user.username}/${notification.post.id}`">
+						<p>%fa:chart-pie%<a :href="`/@${getAcct(notification.user)}`" v-user-preview="notification.user.id">{{ notification.user.name }}</a></p>
+						<router-link class="post-ref" :to="`/@${getAcct(notification.post.user)}/${notification.post.id}`">
 							%fa:quote-left%{{ getPostSummary(notification.post) }}%fa:quote-right%
 						</router-link>
 					</div>
@@ -102,6 +102,7 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../common/user/get-acct';
 import getPostSummary from '../../../../../common/get-post-summary';
 
 export default Vue.extend({
@@ -152,6 +153,7 @@ export default Vue.extend({
 		(this as any).os.stream.dispose(this.connectionId);
 	},
 	methods: {
+		getAcct,
 		fetchMoreNotifications() {
 			this.fetchingMoreNotifications = true;
 
diff --git a/src/web/app/desktop/views/components/post-detail.sub.vue b/src/web/app/desktop/views/components/post-detail.sub.vue
index 53fc724fc6..59d8db04ce 100644
--- a/src/web/app/desktop/views/components/post-detail.sub.vue
+++ b/src/web/app/desktop/views/components/post-detail.sub.vue
@@ -1,16 +1,16 @@
 <template>
 <div class="sub" :title="title">
-	<router-link class="avatar-anchor" :to="`/@${post.user.username}`">
+	<router-link class="avatar-anchor" :to="`/@${acct}`">
 		<img class="avatar" :src="`${post.user.avatar_url}?thumbnail&size=64`" alt="avatar" v-user-preview="post.user_id"/>
 	</router-link>
 	<div class="main">
 		<header>
 			<div class="left">
-				<router-link class="name" :to="`/@${post.user.username}`" v-user-preview="post.user_id">{{ post.user.name }}</router-link>
-				<span class="username">@{{ post.user.username }}</span>
+				<router-link class="name" :to="`/@${acct}`" v-user-preview="post.user_id">{{ post.user.name }}</router-link>
+				<span class="username">@{{ acct }}</span>
 			</div>
 			<div class="right">
-				<router-link class="time" :to="`/@${post.user.username}/${post.id}`">
+				<router-link class="time" :to="`/@${acct}/${post.id}`">
 					<mk-time :time="post.created_at"/>
 				</router-link>
 			</div>
@@ -28,10 +28,14 @@
 <script lang="ts">
 import Vue from 'vue';
 import dateStringify from '../../../common/scripts/date-stringify';
+import getAcct from '../../../../../common/user/get-acct';
 
 export default Vue.extend({
 	props: ['post'],
 	computed: {
+		acct() {
+			return getAcct(this.post.user);
+		},
 		title(): string {
 			return dateStringify(this.post.created_at);
 		}
diff --git a/src/web/app/desktop/views/components/post-detail.vue b/src/web/app/desktop/views/components/post-detail.vue
index 9a8958679c..f09bf4cbd5 100644
--- a/src/web/app/desktop/views/components/post-detail.vue
+++ b/src/web/app/desktop/views/components/post-detail.vue
@@ -18,22 +18,22 @@
 	</div>
 	<div class="repost" v-if="isRepost">
 		<p>
-			<router-link class="avatar-anchor" :to="`/@${post.user.username}`" v-user-preview="post.user_id">
+			<router-link class="avatar-anchor" :to="`/@${acct}`" v-user-preview="post.user_id">
 				<img class="avatar" :src="`${post.user.avatar_url}?thumbnail&size=32`" alt="avatar"/>
 			</router-link>
 			%fa:retweet%
-			<router-link class="name" :href="`/@${post.user.username}`">{{ post.user.name }}</router-link>
+			<router-link class="name" :href="`/@${acct}`">{{ post.user.name }}</router-link>
 			がRepost
 		</p>
 	</div>
 	<article>
-		<router-link class="avatar-anchor" :to="`/@${p.user.username}`">
+		<router-link class="avatar-anchor" :to="`/@${acct}`">
 			<img class="avatar" :src="`${p.user.avatar_url}?thumbnail&size=64`" alt="avatar" v-user-preview="p.user.id"/>
 		</router-link>
 		<header>
-			<router-link class="name" :to="`/@${p.user.username}`" v-user-preview="p.user.id">{{ p.user.name }}</router-link>
-			<span class="username">@{{ p.user.username }}</span>
-			<router-link class="time" :to="`/@${p.user.username}/${p.id}`">
+			<router-link class="name" :to="`/@${acct}`" v-user-preview="p.user.id">{{ p.user.name }}</router-link>
+			<span class="username">@{{ acct }}</span>
+			<router-link class="time" :to="`/@${acct}/${p.id}`">
 				<mk-time :time="p.created_at"/>
 			</router-link>
 		</header>
@@ -78,6 +78,7 @@
 <script lang="ts">
 import Vue from 'vue';
 import dateStringify from '../../../common/scripts/date-stringify';
+import getAcct from '../../../../../common/user/get-acct';
 
 import MkPostFormWindow from './post-form-window.vue';
 import MkRepostFormWindow from './repost-form-window.vue';
@@ -98,6 +99,11 @@ export default Vue.extend({
 			default: false
 		}
 	},
+	computed: {
+		acct() {
+			return getAcct(this.post.user);
+		}
+	},
 	data() {
 		return {
 			context: [],
diff --git a/src/web/app/desktop/views/components/post-preview.vue b/src/web/app/desktop/views/components/post-preview.vue
index edb593457e..808220c0e0 100644
--- a/src/web/app/desktop/views/components/post-preview.vue
+++ b/src/web/app/desktop/views/components/post-preview.vue
@@ -1,13 +1,13 @@
 <template>
 <div class="mk-post-preview" :title="title">
-	<router-link class="avatar-anchor" :to="`/@${post.user.username}`">
+	<router-link class="avatar-anchor" :to="`/@${acct}`">
 		<img class="avatar" :src="`${post.user.avatar_url}?thumbnail&size=64`" alt="avatar" v-user-preview="post.user_id"/>
 	</router-link>
 	<div class="main">
 		<header>
-			<router-link class="name" :to="`/@${post.user.username}`" v-user-preview="post.user_id">{{ post.user.name }}</router-link>
-			<span class="username">@{{ post.user.username }}</span>
-			<router-link class="time" :to="`/@${post.user.username}/${post.id}`">
+			<router-link class="name" :to="`/@${acct}`" v-user-preview="post.user_id">{{ post.user.name }}</router-link>
+			<span class="username">@{{ acct }}</span>
+			<router-link class="time" :to="`/@${acct}/${post.id}`">
 				<mk-time :time="post.created_at"/>
 			</router-link>
 		</header>
@@ -21,10 +21,14 @@
 <script lang="ts">
 import Vue from 'vue';
 import dateStringify from '../../../common/scripts/date-stringify';
+import getAcct from '../../../../../common/user/get-acct';
 
 export default Vue.extend({
 	props: ['post'],
 	computed: {
+		acct() {
+			return getAcct(this.post.user);
+		},
 		title(): string {
 			return dateStringify(this.post.created_at);
 		}
diff --git a/src/web/app/desktop/views/components/posts.post.sub.vue b/src/web/app/desktop/views/components/posts.post.sub.vue
index 2fd8a9865f..120700877c 100644
--- a/src/web/app/desktop/views/components/posts.post.sub.vue
+++ b/src/web/app/desktop/views/components/posts.post.sub.vue
@@ -1,13 +1,13 @@
 <template>
 <div class="sub" :title="title">
-	<router-link class="avatar-anchor" :to="`/@${post.user.username}`">
+	<router-link class="avatar-anchor" :to="`/@${acct}`">
 		<img class="avatar" :src="`${post.user.avatar_url}?thumbnail&size=64`" alt="avatar" v-user-preview="post.user_id"/>
 	</router-link>
 	<div class="main">
 		<header>
-			<router-link class="name" :to="`/@${post.user.username}`" v-user-preview="post.user_id">{{ post.user.name }}</router-link>
-			<span class="username">@{{ post.user.username }}</span>
-			<router-link class="created-at" :to="`/@${post.user.username}/${post.id}`">
+			<router-link class="name" :to="`/@${acct}`" v-user-preview="post.user_id">{{ post.user.name }}</router-link>
+			<span class="username">@{{ acct }}</span>
+			<router-link class="created-at" :to="`/@${acct}/${post.id}`">
 				<mk-time :time="post.created_at"/>
 			</router-link>
 		</header>
@@ -21,10 +21,14 @@
 <script lang="ts">
 import Vue from 'vue';
 import dateStringify from '../../../common/scripts/date-stringify';
+import getAcct from '../../../../../common/user/get-acct';
 
 export default Vue.extend({
 	props: ['post'],
 	computed: {
+		acct() {
+			return getAcct(this.post.user);
+		},
 		title(): string {
 			return dateStringify(this.post.created_at);
 		}
diff --git a/src/web/app/desktop/views/components/posts.post.vue b/src/web/app/desktop/views/components/posts.post.vue
index a525900b95..6b4d3d2789 100644
--- a/src/web/app/desktop/views/components/posts.post.vue
+++ b/src/web/app/desktop/views/components/posts.post.vue
@@ -5,25 +5,25 @@
 	</div>
 	<div class="repost" v-if="isRepost">
 		<p>
-			<router-link class="avatar-anchor" :to="`/@${post.user.username}`" v-user-preview="post.user_id">
+			<router-link class="avatar-anchor" :to="`/@${acct}`" v-user-preview="post.user_id">
 				<img class="avatar" :src="`${post.user.avatar_url}?thumbnail&size=32`" alt="avatar"/>
 			</router-link>
 			%fa:retweet%
 			<span>{{ '%i18n:desktop.tags.mk-timeline-post.reposted-by%'.substr(0, '%i18n:desktop.tags.mk-timeline-post.reposted-by%'.indexOf('{')) }}</span>
-			<a class="name" :href="`/@${post.user.username}`" v-user-preview="post.user_id">{{ post.user.name }}</a>
+			<a class="name" :href="`/@${acct}`" v-user-preview="post.user_id">{{ post.user.name }}</a>
 			<span>{{ '%i18n:desktop.tags.mk-timeline-post.reposted-by%'.substr('%i18n:desktop.tags.mk-timeline-post.reposted-by%'.indexOf('}') + 1) }}</span>
 		</p>
 		<mk-time :time="post.created_at"/>
 	</div>
 	<article>
-		<router-link class="avatar-anchor" :to="`/@${p.user.username}`">
+		<router-link class="avatar-anchor" :to="`/@${acct}`">
 			<img class="avatar" :src="`${p.user.avatar_url}?thumbnail&size=64`" alt="avatar" v-user-preview="p.user.id"/>
 		</router-link>
 		<div class="main">
 			<header>
-				<router-link class="name" :to="`/@${p.user.username}`" v-user-preview="p.user.id">{{ p.user.name }}</router-link>
-				<span class="is-bot" v-if="p.user.account.is_bot">bot</span>
-				<span class="username">@{{ p.user.username }}</span>
+				<router-link class="name" :to="`/@${acct}`" v-user-preview="p.user.id">{{ acct }}</router-link>
+				<span class="is-bot" v-if="p.user.host === null && p.user.account.is_bot">bot</span>
+				<span class="username">@{{ acct }}</span>
 				<div class="info">
 					<span class="app" v-if="p.app">via <b>{{ p.app.name }}</b></span>
 					<span class="mobile" v-if="p.via_mobile">%fa:mobile-alt%</span>
@@ -85,6 +85,7 @@
 <script lang="ts">
 import Vue from 'vue';
 import dateStringify from '../../../common/scripts/date-stringify';
+import getAcct from '../../../../../common/user/get-acct';
 import MkPostFormWindow from './post-form-window.vue';
 import MkRepostFormWindow from './repost-form-window.vue';
 import MkPostMenu from '../../../common/views/components/post-menu.vue';
@@ -115,6 +116,9 @@ export default Vue.extend({
 		};
 	},
 	computed: {
+		acct() {
+			return getAcct(this.p.user);
+		},
 		isRepost(): boolean {
 			return (this.post.repost &&
 				this.post.text == null &&
@@ -135,7 +139,7 @@ export default Vue.extend({
 			return dateStringify(this.p.created_at);
 		},
 		url(): string {
-			return `/@${this.p.user.username}/${this.p.id}`;
+			return `/@${this.acct}/${this.p.id}`;
 		},
 		urls(): string[] {
 			if (this.p.ast) {
diff --git a/src/web/app/desktop/views/components/settings.mute.vue b/src/web/app/desktop/views/components/settings.mute.vue
index 0768b54ef8..a8dfe10604 100644
--- a/src/web/app/desktop/views/components/settings.mute.vue
+++ b/src/web/app/desktop/views/components/settings.mute.vue
@@ -5,7 +5,7 @@
 	</div>
 	<div class="users" v-if="users.length != 0">
 		<div v-for="user in users" :key="user.id">
-			<p><b>{{ user.name }}</b> @{{ user.username }}</p>
+			<p><b>{{ user.name }}</b> @{{ getAcct(user) }}</p>
 		</div>
 	</div>
 </div>
@@ -13,6 +13,7 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../common/user/get-acct';
 
 export default Vue.extend({
 	data() {
@@ -21,6 +22,9 @@ export default Vue.extend({
 			users: []
 		};
 	},
+	methods: {
+		getAcct
+	},
 	mounted() {
 		(this as any).api('mute/list').then(x => {
 			this.users = x.users;
diff --git a/src/web/app/desktop/views/components/user-preview.vue b/src/web/app/desktop/views/components/user-preview.vue
index ffc959fac5..24d613f120 100644
--- a/src/web/app/desktop/views/components/user-preview.vue
+++ b/src/web/app/desktop/views/components/user-preview.vue
@@ -2,12 +2,12 @@
 <div class="mk-user-preview">
 	<template v-if="u != null">
 		<div class="banner" :style="u.banner_url ? `background-image: url(${u.banner_url}?thumbnail&size=512)` : ''"></div>
-		<router-link class="avatar" :to="`/@${u.username}`">
+		<router-link class="avatar" :to="`/@${acct}`">
 			<img :src="`${u.avatar_url}?thumbnail&size=64`" alt="avatar"/>
 		</router-link>
 		<div class="title">
-			<router-link class="name" :to="`/@${u.username}`">{{ u.name }}</router-link>
-			<p class="username">@{{ u.username }}</p>
+			<router-link class="name" :to="`/@${acct}`">{{ u.name }}</router-link>
+			<p class="username">@{{ acct }}</p>
 		</div>
 		<div class="description">{{ u.description }}</div>
 		<div class="status">
@@ -29,6 +29,8 @@
 <script lang="ts">
 import Vue from 'vue';
 import * as anime from 'animejs';
+import getAcct from '../../../../../common/user/get-acct';
+import parseAcct from '../../../../../common/user/parse-acct';
 
 export default Vue.extend({
 	props: {
@@ -37,6 +39,11 @@ export default Vue.extend({
 			required: true
 		}
 	},
+	computed: {
+		acct() {
+			return getAcct(this.u);
+		}
+	},
 	data() {
 		return {
 			u: null
@@ -49,10 +56,11 @@ export default Vue.extend({
 				this.open();
 			});
 		} else {
-			(this as any).api('users/show', {
-				user_id: this.user[0] == '@' ? undefined : this.user,
-				username: this.user[0] == '@' ? this.user.substr(1) : undefined
-			}).then(user => {
+			const query = this.user[0] == '@' ?
+				parseAcct(this.user[0].substr(1)) :
+				{ user_id: this.user[0] };
+
+			(this as any).api('users/show', query).then(user => {
 				this.u = user;
 				this.open();
 			});
diff --git a/src/web/app/desktop/views/components/users-list.item.vue b/src/web/app/desktop/views/components/users-list.item.vue
index 2d1e133473..e02d1311d2 100644
--- a/src/web/app/desktop/views/components/users-list.item.vue
+++ b/src/web/app/desktop/views/components/users-list.item.vue
@@ -1,12 +1,12 @@
 <template>
 <div class="root item">
-	<router-link class="avatar-anchor" :to="`/@${user.username}`" v-user-preview="user.id">
+	<router-link class="avatar-anchor" :to="`/@${acct}`" v-user-preview="user.id">
 		<img class="avatar" :src="`${user.avatar_url}?thumbnail&size=64`" alt="avatar"/>
 	</router-link>
 	<div class="main">
 		<header>
-			<router-link class="name" :to="`/@${user.username}`" v-user-preview="user.id">{{ user.name }}</router-link>
-			<span class="username">@{{ user.username }}</span>
+			<router-link class="name" :to="`/@${acct}`" v-user-preview="user.id">{{ user.name }}</router-link>
+			<span class="username">@{{ acct }}</span>
 		</header>
 		<div class="body">
 			<p class="followed" v-if="user.is_followed">フォローされています</p>
@@ -19,8 +19,15 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../common/user/get-acct';
+
 export default Vue.extend({
-	props: ['user']
+	props: ['user'],
+	computed: {
+		acct() {
+			return getAcct(this.user);
+		}
+	}
 });
 </script>
 
diff --git a/src/web/app/desktop/views/pages/messaging-room.vue b/src/web/app/desktop/views/pages/messaging-room.vue
index 99279dc07b..0cab1e0d10 100644
--- a/src/web/app/desktop/views/pages/messaging-room.vue
+++ b/src/web/app/desktop/views/pages/messaging-room.vue
@@ -7,6 +7,7 @@
 <script lang="ts">
 import Vue from 'vue';
 import Progress from '../../../common/scripts/loading';
+import parseAcct from '../../../../../common/user/parse-acct';
 
 export default Vue.extend({
 	data() {
@@ -29,9 +30,7 @@ export default Vue.extend({
 			Progress.start();
 			this.fetching = true;
 
-			(this as any).api('users/show', {
-				username: this.$route.params.username
-			}).then(user => {
+			(this as any).api('users/show', parseAcct(this.$route.params.user)).then(user => {
 				this.user = user;
 				this.fetching = false;
 
diff --git a/src/web/app/desktop/views/pages/user/user.followers-you-know.vue b/src/web/app/desktop/views/pages/user/user.followers-you-know.vue
index 20675c454e..80b38e8acc 100644
--- a/src/web/app/desktop/views/pages/user/user.followers-you-know.vue
+++ b/src/web/app/desktop/views/pages/user/user.followers-you-know.vue
@@ -3,7 +3,7 @@
 	<p class="title">%fa:users%%i18n:desktop.tags.mk-user.followers-you-know.title%</p>
 	<p class="initializing" v-if="fetching">%fa:spinner .pulse .fw%%i18n:desktop.tags.mk-user.followers-you-know.loading%<mk-ellipsis/></p>
 	<div v-if="!fetching && users.length > 0">
-	<router-link v-for="user in users" :to="`/@${user.username}`" :key="user.id">
+	<router-link v-for="user in users" :to="`/@${getAcct(user)}`" :key="user.id">
 		<img :src="`${user.avatar_url}?thumbnail&size=64`" :alt="user.name" v-user-preview="user.id"/>
 	</router-link>
 	</div>
@@ -13,6 +13,8 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../../common/user/get-acct';
+
 export default Vue.extend({
 	props: ['user'],
 	data() {
@@ -21,6 +23,9 @@ export default Vue.extend({
 			fetching: true
 		};
 	},
+	method() {
+		getAcct
+	},
 	mounted() {
 		(this as any).api('users/followers', {
 			user_id: this.user.id,
diff --git a/src/web/app/desktop/views/pages/user/user.friends.vue b/src/web/app/desktop/views/pages/user/user.friends.vue
index a60020f59a..57e6def27b 100644
--- a/src/web/app/desktop/views/pages/user/user.friends.vue
+++ b/src/web/app/desktop/views/pages/user/user.friends.vue
@@ -4,12 +4,12 @@
 	<p class="initializing" v-if="fetching">%fa:spinner .pulse .fw%%i18n:desktop.tags.mk-user.frequently-replied-users.loading%<mk-ellipsis/></p>
 	<template v-if="!fetching && users.length != 0">
 		<div class="user" v-for="friend in users">
-			<router-link class="avatar-anchor" :to="`/@${friend.username}`">
+			<router-link class="avatar-anchor" :to="`/@${getAcct(friend)}`">
 				<img class="avatar" :src="`${friend.avatar_url}?thumbnail&size=42`" alt="" v-user-preview="friend.id"/>
 			</router-link>
 			<div class="body">
-				<router-link class="name" :to="`/@${friend.username}`" v-user-preview="friend.id">{{ friend.name }}</router-link>
-				<p class="username">@{{ friend.username }}</p>
+				<router-link class="name" :to="`/@${getAcct(friend)}`" v-user-preview="friend.id">{{ friend.name }}</router-link>
+				<p class="username">@{{ getAcct(friend) }}</p>
 			</div>
 			<mk-follow-button :user="friend"/>
 		</div>
@@ -20,6 +20,8 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../../common/user/get-acct';
+
 export default Vue.extend({
 	props: ['user'],
 	data() {
@@ -28,6 +30,9 @@ export default Vue.extend({
 			fetching: true
 		};
 	},
+	method() {
+		getAcct
+	},
 	mounted() {
 		(this as any).api('users/get_frequently_replied_users', {
 			user_id: this.user.id,
diff --git a/src/web/app/desktop/views/pages/user/user.header.vue b/src/web/app/desktop/views/pages/user/user.header.vue
index e60b312ca8..3522e76bdb 100644
--- a/src/web/app/desktop/views/pages/user/user.header.vue
+++ b/src/web/app/desktop/views/pages/user/user.header.vue
@@ -8,13 +8,13 @@
 		<img class="avatar" :src="`${user.avatar_url}?thumbnail&size=150`" alt="avatar"/>
 		<div class="title">
 			<p class="name">{{ user.name }}</p>
-			<p class="username">@{{ user.username }}</p>
-			<p class="location" v-if="user.account.profile.location">%fa:map-marker%{{ user.account.profile.location }}</p>
+			<p class="username">@{{ acct }}</p>
+			<p class="location" v-if="user.host === null && user.account.profile.location">%fa:map-marker%{{ user.account.profile.location }}</p>
 		</div>
 		<footer>
-			<router-link :to="`/@${user.username}`" :data-active="$parent.page == 'home'">%fa:home%概要</router-link>
-			<router-link :to="`/@${user.username}/media`" :data-active="$parent.page == 'media'">%fa:image%メディア</router-link>
-			<router-link :to="`/@${user.username}/graphs`" :data-active="$parent.page == 'graphs'">%fa:chart-bar%グラフ</router-link>
+			<router-link :to="`/@${acct}`" :data-active="$parent.page == 'home'">%fa:home%概要</router-link>
+			<router-link :to="`/@${acct}/media`" :data-active="$parent.page == 'media'">%fa:image%メディア</router-link>
+			<router-link :to="`/@${acct}/graphs`" :data-active="$parent.page == 'graphs'">%fa:chart-bar%グラフ</router-link>
 		</footer>
 	</div>
 </div>
@@ -22,9 +22,15 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../../common/user/get-acct';
 
 export default Vue.extend({
 	props: ['user'],
+	computed: {
+		acct() {
+			return getAcct(this.user);
+		}
+	},
 	mounted() {
 		window.addEventListener('load', this.onScroll);
 		window.addEventListener('scroll', this.onScroll);
diff --git a/src/web/app/desktop/views/pages/user/user.home.vue b/src/web/app/desktop/views/pages/user/user.home.vue
index 592d5cca62..2483a6c726 100644
--- a/src/web/app/desktop/views/pages/user/user.home.vue
+++ b/src/web/app/desktop/views/pages/user/user.home.vue
@@ -5,7 +5,7 @@
 			<x-profile :user="user"/>
 			<x-photos :user="user"/>
 			<x-followers-you-know v-if="os.isSignedIn && os.i.id != user.id" :user="user"/>
-			<p>%i18n:desktop.tags.mk-user.last-used-at%: <b><mk-time :time="user.account.last_used_at"/></b></p>
+			<p v-if="user.host === null">%i18n:desktop.tags.mk-user.last-used-at%: <b><mk-time :time="user.account.last_used_at"/></b></p>
 		</div>
 	</div>
 	<main>
diff --git a/src/web/app/desktop/views/pages/user/user.profile.vue b/src/web/app/desktop/views/pages/user/user.profile.vue
index 1e7cb455b0..b51aae18fa 100644
--- a/src/web/app/desktop/views/pages/user/user.profile.vue
+++ b/src/web/app/desktop/views/pages/user/user.profile.vue
@@ -7,10 +7,10 @@
 		<p v-if="!user.is_muted"><a @click="mute">%i18n:desktop.tags.mk-user.mute%</a></p>
 	</div>
 	<div class="description" v-if="user.description">{{ user.description }}</div>
-	<div class="birthday" v-if="user.account.profile.birthday">
+	<div class="birthday" v-if="user.host === null && user.account.profile.birthday">
 		<p>%fa:birthday-cake%{{ user.account.profile.birthday.replace('-', '年').replace('-', '月') + '日' }} ({{ age }}歳)</p>
 	</div>
-	<div class="twitter" v-if="user.account.twitter">
+	<div class="twitter" v-if="user.host === null && user.account.twitter">
 		<p>%fa:B twitter%<a :href="`https://twitter.com/${user.account.twitter.screen_name}`" target="_blank">@{{ user.account.twitter.screen_name }}</a></p>
 	</div>
 	<div class="status">
diff --git a/src/web/app/desktop/views/pages/user/user.vue b/src/web/app/desktop/views/pages/user/user.vue
index 1ce3fa27e7..67cef93269 100644
--- a/src/web/app/desktop/views/pages/user/user.vue
+++ b/src/web/app/desktop/views/pages/user/user.vue
@@ -9,6 +9,7 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import parseAcct from '../../../../../../common/user/parse-acct';
 import Progress from '../../../../common/scripts/loading';
 import XHeader from './user.header.vue';
 import XHome from './user.home.vue';
@@ -39,9 +40,7 @@ export default Vue.extend({
 		fetch() {
 			this.fetching = true;
 			Progress.start();
-			(this as any).api('users/show', {
-				username: this.$route.params.user
-			}).then(user => {
+			(this as any).api('users/show', parseAcct(this.$route.params.user)).then(user => {
 				this.user = user;
 				this.fetching = false;
 				Progress.done();
diff --git a/src/web/app/desktop/views/pages/welcome.vue b/src/web/app/desktop/views/pages/welcome.vue
index c514500b2d..927ddf575b 100644
--- a/src/web/app/desktop/views/pages/welcome.vue
+++ b/src/web/app/desktop/views/pages/welcome.vue
@@ -8,7 +8,7 @@
 					<p>ようこそ！ <b>Misskey</b>はTwitter風ミニブログSNSです。思ったことや皆と共有したいことを投稿しましょう。タイムラインを見れば、皆の関心事をすぐにチェックすることもできます。<a :href="aboutUrl">詳しく...</a></p>
 					<p><button class="signup" @click="signup">はじめる</button><button class="signin" @click="signin">ログイン</button></p>
 					<div class="users">
-						<router-link v-for="user in users" :key="user.id" class="avatar-anchor" :to="`/@${user.username}`" v-user-preview="user.id">
+						<router-link v-for="user in users" :key="user.id" class="avatar-anchor" :to="`/@${getAcct(user)}`" v-user-preview="user.id">
 							<img class="avatar" :src="`${user.avatar_url}?thumbnail&size=64`" alt="avatar"/>
 						</router-link>
 					</div>
@@ -43,6 +43,7 @@
 <script lang="ts">
 import Vue from 'vue';
 import { docsUrl, copyright, lang } from '../../../config';
+import getAcct from '../../../../../common/user/get-acct';
 
 const shares = [
 	'Everything!',
@@ -97,6 +98,7 @@ export default Vue.extend({
 		clearInterval(this.clock);
 	},
 	methods: {
+		getAcct,
 		signup() {
 			this.$modal.show('signup');
 		},
diff --git a/src/web/app/desktop/views/widgets/channel.channel.post.vue b/src/web/app/desktop/views/widgets/channel.channel.post.vue
index b2fa92ad43..433f9a00aa 100644
--- a/src/web/app/desktop/views/widgets/channel.channel.post.vue
+++ b/src/web/app/desktop/views/widgets/channel.channel.post.vue
@@ -2,8 +2,8 @@
 <div class="post">
 	<header>
 		<a class="index" @click="reply">{{ post.index }}:</a>
-		<router-link class="name" :to="`/@${post.user.username}`" v-user-preview="post.user.id"><b>{{ post.user.name }}</b></router-link>
-		<span>ID:<i>{{ post.user.username }}</i></span>
+		<router-link class="name" :to="`/@${acct}`" v-user-preview="post.user.id"><b>{{ post.user.name }}</b></router-link>
+		<span>ID:<i>{{ acct }}</i></span>
 	</header>
 	<div>
 		<a v-if="post.reply">&gt;&gt;{{ post.reply.index }}</a>
@@ -19,8 +19,15 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../common/user/get-acct';
+
 export default Vue.extend({
 	props: ['post'],
+	computed: {
+		acct() {
+			return getAcct(this.post.user);
+		}
+	},
 	methods: {
 		reply() {
 			this.$emit('reply', this.post);
diff --git a/src/web/app/desktop/views/widgets/polls.vue b/src/web/app/desktop/views/widgets/polls.vue
index 636378d0bb..e5db34fc7a 100644
--- a/src/web/app/desktop/views/widgets/polls.vue
+++ b/src/web/app/desktop/views/widgets/polls.vue
@@ -5,8 +5,8 @@
 		<button @click="fetch" title="%i18n:desktop.tags.mk-recommended-polls-home-widget.refresh%">%fa:sync%</button>
 	</template>
 	<div class="poll" v-if="!fetching && poll != null">
-		<p v-if="poll.text"><router-link to="`/@${ poll.user.username }/${ poll.id }`">{{ poll.text }}</router-link></p>
-		<p v-if="!poll.text"><router-link to="`/@${ poll.user.username }/${ poll.id }`">%fa:link%</router-link></p>
+		<p v-if="poll.text"><router-link to="`/@${ acct }/${ poll.id }`">{{ poll.text }}</router-link></p>
+		<p v-if="!poll.text"><router-link to="`/@${ acct }/${ poll.id }`">%fa:link%</router-link></p>
 		<mk-poll :post="poll"/>
 	</div>
 	<p class="empty" v-if="!fetching && poll == null">%i18n:desktop.tags.mk-recommended-polls-home-widget.nothing%</p>
@@ -16,12 +16,19 @@
 
 <script lang="ts">
 import define from '../../../common/define-widget';
+import getAcct from '../../../../../common/user/get-acct';
+
 export default define({
 	name: 'polls',
 	props: () => ({
 		compact: false
 	})
 }).extend({
+	computed: {
+		acct() {
+			return getAcct(this.poll.user);
+		},
+	},
 	data() {
 		return {
 			poll: null,
diff --git a/src/web/app/desktop/views/widgets/trends.vue b/src/web/app/desktop/views/widgets/trends.vue
index c006c811d6..77779787ee 100644
--- a/src/web/app/desktop/views/widgets/trends.vue
+++ b/src/web/app/desktop/views/widgets/trends.vue
@@ -6,8 +6,8 @@
 	</template>
 	<p class="fetching" v-if="fetching">%fa:spinner .pulse .fw%%i18n:common.loading%<mk-ellipsis/></p>
 	<div class="post" v-else-if="post != null">
-		<p class="text"><router-link :to="`/@${ post.user.username }/${ post.id }`">{{ post.text }}</router-link></p>
-		<p class="author">―<router-link :to="`/@${ post.user.username }`">@{{ post.user.username }}</router-link></p>
+		<p class="text"><router-link :to="`/@${ acct }/${ post.id }`">{{ post.text }}</router-link></p>
+		<p class="author">―<router-link :to="`/@${ acct }`">@{{ acct }}</router-link></p>
 	</div>
 	<p class="empty" v-else>%i18n:desktop.tags.mk-trends-home-widget.nothing%</p>
 </div>
@@ -15,12 +15,19 @@
 
 <script lang="ts">
 import define from '../../../common/define-widget';
+import getAcct from '../../../../../common/user/get-acct';
+
 export default define({
 	name: 'trends',
 	props: () => ({
 		compact: false
 	})
 }).extend({
+	computed: {
+		acct() {
+			return getAcct(this.post.user);
+		},
+	},
 	data() {
 		return {
 			post: null,
diff --git a/src/web/app/desktop/views/widgets/users.vue b/src/web/app/desktop/views/widgets/users.vue
index c0a85a08e2..10e3c529ee 100644
--- a/src/web/app/desktop/views/widgets/users.vue
+++ b/src/web/app/desktop/views/widgets/users.vue
@@ -7,12 +7,12 @@
 	<p class="fetching" v-if="fetching">%fa:spinner .pulse .fw%%i18n:common.loading%<mk-ellipsis/></p>
 	<template v-else-if="users.length != 0">
 		<div class="user" v-for="_user in users">
-			<router-link class="avatar-anchor" :to="`/@${_user.username}`">
+			<router-link class="avatar-anchor" :to="`/@${getAcct(_user)}`">
 				<img class="avatar" :src="`${_user.avatar_url}?thumbnail&size=42`" alt="" v-user-preview="_user.id"/>
 			</router-link>
 			<div class="body">
-				<router-link class="name" :to="`/@${_user.username}`" v-user-preview="_user.id">{{ _user.name }}</router-link>
-				<p class="username">@{{ _user.username }}</p>
+				<router-link class="name" :to="`/@${getAcct(_user)}`" v-user-preview="_user.id">{{ _user.name }}</router-link>
+				<p class="username">@{{ getAcct(_user) }}</p>
 			</div>
 			<mk-follow-button :user="_user"/>
 		</div>
@@ -23,6 +23,7 @@
 
 <script lang="ts">
 import define from '../../../common/define-widget';
+import getAcct from '../../../../../common/user/get-acct';
 
 const limit = 3;
 
@@ -43,6 +44,7 @@ export default define({
 		this.fetch();
 	},
 	methods: {
+		getAcct,
 		func() {
 			this.props.compact = !this.props.compact;
 		},
diff --git a/src/web/app/mobile/script.ts b/src/web/app/mobile/script.ts
index 062a6d83d4..4776fccddb 100644
--- a/src/web/app/mobile/script.ts
+++ b/src/web/app/mobile/script.ts
@@ -57,7 +57,7 @@ init((launch) => {
 			{ path: '/i/settings/profile', component: MkProfileSetting },
 			{ path: '/i/notifications', component: MkNotifications },
 			{ path: '/i/messaging', component: MkMessaging },
-			{ path: '/i/messaging/:username', component: MkMessagingRoom },
+			{ path: '/i/messaging/:user', component: MkMessagingRoom },
 			{ path: '/i/drive', component: MkDrive },
 			{ path: '/i/drive/folder/:folder', component: MkDrive },
 			{ path: '/i/drive/file/:file', component: MkDrive },
diff --git a/src/web/app/mobile/views/components/notification.vue b/src/web/app/mobile/views/components/notification.vue
index 301fb81ddb..150ac0fd8b 100644
--- a/src/web/app/mobile/views/components/notification.vue
+++ b/src/web/app/mobile/views/components/notification.vue
@@ -2,15 +2,15 @@
 <div class="mk-notification">
 	<div class="notification reaction" v-if="notification.type == 'reaction'">
 		<mk-time :time="notification.created_at"/>
-		<router-link class="avatar-anchor" :to="`/@${notification.user.username}`">
+		<router-link class="avatar-anchor" :to="`/@${acct}`">
 			<img class="avatar" :src="`${notification.user.avatar_url}?thumbnail&size=64`" alt="avatar"/>
 		</router-link>
 		<div class="text">
 			<p>
 				<mk-reaction-icon :reaction="notification.reaction"/>
-				<router-link :to="`/@${notification.user.username}`">{{ notification.user.name }}</router-link>
+				<router-link :to="`/@${acct}`">{{ notification.user.name }}</router-link>
 			</p>
-			<router-link class="post-ref" :to="`/@${notification.post.user.username}/${notification.post.id}`">
+			<router-link class="post-ref" :to="`/@${acct}/${notification.post.id}`">
 				%fa:quote-left%{{ getPostSummary(notification.post) }}
 				%fa:quote-right%
 			</router-link>
@@ -19,15 +19,15 @@
 
 	<div class="notification repost" v-if="notification.type == 'repost'">
 		<mk-time :time="notification.created_at"/>
-		<router-link class="avatar-anchor" :to="`/@${notification.post.user.username}`">
+		<router-link class="avatar-anchor" :to="`/@${acct}`">
 			<img class="avatar" :src="`${notification.post.user.avatar_url}?thumbnail&size=64`" alt="avatar"/>
 		</router-link>
 		<div class="text">
 			<p>
 				%fa:retweet%
-				<router-link :to="`/@${notification.post.user.username}`">{{ notification.post.user.name }}</router-link>
+				<router-link :to="`/@${acct}`">{{ notification.post.user.name }}</router-link>
 			</p>
-			<router-link class="post-ref" :to="`/@${notification.post.user.username}/${notification.post.id}`">
+			<router-link class="post-ref" :to="`/@${acct}/${notification.post.id}`">
 				%fa:quote-left%{{ getPostSummary(notification.post.repost) }}%fa:quote-right%
 			</router-link>
 		</div>
@@ -39,13 +39,13 @@
 
 	<div class="notification follow" v-if="notification.type == 'follow'">
 		<mk-time :time="notification.created_at"/>
-		<router-link class="avatar-anchor" :to="`/@${notification.user.username}`">
+		<router-link class="avatar-anchor" :to="`/@${acct}`">
 			<img class="avatar" :src="`${notification.user.avatar_url}?thumbnail&size=64`" alt="avatar"/>
 		</router-link>
 		<div class="text">
 			<p>
 				%fa:user-plus%
-				<router-link :to="`/@${notification.user.username}`">{{ notification.user.name }}</router-link>
+				<router-link :to="`/@${acct}`">{{ notification.user.name }}</router-link>
 			</p>
 		</div>
 	</div>
@@ -60,15 +60,15 @@
 
 	<div class="notification poll_vote" v-if="notification.type == 'poll_vote'">
 		<mk-time :time="notification.created_at"/>
-		<router-link class="avatar-anchor" :to="`/@${notification.user.username}`">
+		<router-link class="avatar-anchor" :to="`/@${acct}`">
 			<img class="avatar" :src="`${notification.user.avatar_url}?thumbnail&size=64`" alt="avatar"/>
 		</router-link>
 		<div class="text">
 			<p>
 				%fa:chart-pie%
-				<router-link :to="`/@${notification.user.username}`">{{ notification.user.name }}</router-link>
+				<router-link :to="`/@${acct}`">{{ notification.user.name }}</router-link>
 			</p>
-			<router-link class="post-ref" :to="`/@${notification.post.user.username}/${notification.post.id}`">
+			<router-link class="post-ref" :to="`/@${acct}/${notification.post.id}`">
 				%fa:quote-left%{{ getPostSummary(notification.post) }}%fa:quote-right%
 			</router-link>
 		</div>
@@ -79,9 +79,15 @@
 <script lang="ts">
 import Vue from 'vue';
 import getPostSummary from '../../../../../common/get-post-summary';
+import getAcct from '../../../../../common/user/get-acct';
 
 export default Vue.extend({
 	props: ['notification'],
+	computed: {
+		acct() {
+			return getAcct(this.notification.user);
+		}
+	},
 	data() {
 		return {
 			getPostSummary
diff --git a/src/web/app/mobile/views/components/post-card.vue b/src/web/app/mobile/views/components/post-card.vue
index 1b3b20d88f..8ca7550c2e 100644
--- a/src/web/app/mobile/views/components/post-card.vue
+++ b/src/web/app/mobile/views/components/post-card.vue
@@ -1,8 +1,8 @@
 <template>
 <div class="mk-post-card">
-	<a :href="`/@${post.user.username}/${post.id}`">
+	<a :href="`/@${acct}/${post.id}`">
 		<header>
-			<img :src="`${post.user.avatar_url}?thumbnail&size=64`" alt="avatar"/><h3>{{ post.user.name }}</h3>
+			<img :src="`${acct}?thumbnail&size=64`" alt="avatar"/><h3>{{ post.user.name }}</h3>
 		</header>
 		<div>
 			{{ text }}
@@ -15,10 +15,14 @@
 <script lang="ts">
 import Vue from 'vue';
 import summary from '../../../../../common/get-post-summary';
+import getAcct from '../../../../../common/user/get-acct';
 
 export default Vue.extend({
 	props: ['post'],
 	computed: {
+		acct() {
+			return getAcct(this.post.user);
+		},
 		text(): string {
 			return summary(this.post);
 		}
diff --git a/src/web/app/mobile/views/components/post-detail.sub.vue b/src/web/app/mobile/views/components/post-detail.sub.vue
index 153acf78e7..6906cf570e 100644
--- a/src/web/app/mobile/views/components/post-detail.sub.vue
+++ b/src/web/app/mobile/views/components/post-detail.sub.vue
@@ -1,13 +1,13 @@
 <template>
 <div class="root sub">
-	<router-link class="avatar-anchor" :to="`/@${post.user.username}`">
+	<router-link class="avatar-anchor" :to="`/@${acct}`">
 		<img class="avatar" :src="`${post.user.avatar_url}?thumbnail&size=64`" alt="avatar"/>
 	</router-link>
 	<div class="main">
 		<header>
-			<router-link class="name" :to="`/@${post.user.username}`">{{ post.user.name }}</router-link>
-			<span class="username">@{{ post.user.username }}</span>
-			<router-link class="time" :to="`/@${post.user.username}/${post.id}`">
+			<router-link class="name" :to="`/@${acct}`">{{ post.user.name }}</router-link>
+			<span class="username">@{{ acct }}</span>
+			<router-link class="time" :to="`/@${acct}/${post.id}`">
 				<mk-time :time="post.created_at"/>
 			</router-link>
 		</header>
@@ -20,8 +20,15 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../common/user/get-acct';
+
 export default Vue.extend({
-	props: ['post']
+	props: ['post'],
+	computed: {
+		acct() {
+			return getAcct(this.post.user);
+		}
+	}
 });
 </script>
 
diff --git a/src/web/app/mobile/views/components/post-detail.vue b/src/web/app/mobile/views/components/post-detail.vue
index f7af71eea5..b5c9158300 100644
--- a/src/web/app/mobile/views/components/post-detail.vue
+++ b/src/web/app/mobile/views/components/post-detail.vue
@@ -17,11 +17,11 @@
 	</div>
 	<div class="repost" v-if="isRepost">
 		<p>
-			<router-link class="avatar-anchor" :to="`/@${post.user.username}`">
+			<router-link class="avatar-anchor" :to="`/@${acct}`">
 				<img class="avatar" :src="`${post.user.avatar_url}?thumbnail&size=32`" alt="avatar"/>
 			</router-link>
 			%fa:retweet%
-			<router-link class="name" :to="`/@${post.user.username}`">
+			<router-link class="name" :to="`/@${acct}`">
 				{{ post.user.name }}
 			</router-link>
 			がRepost
@@ -29,12 +29,12 @@
 	</div>
 	<article>
 		<header>
-			<router-link class="avatar-anchor" :to="`/@${p.user.username}`">
+			<router-link class="avatar-anchor" :to="`/@${pAcct}`">
 				<img class="avatar" :src="`${p.user.avatar_url}?thumbnail&size=64`" alt="avatar"/>
 			</router-link>
 			<div>
-				<router-link class="name" :to="`/@${p.user.username}`">{{ p.user.name }}</router-link>
-				<span class="username">@{{ p.user.username }}</span>
+				<router-link class="name" :to="`/@${pAcct}`">{{ p.user.name }}</router-link>
+				<span class="username">@{{ pAcct }}</span>
 			</div>
 		</header>
 		<div class="body">
@@ -53,7 +53,7 @@
 				<mk-post-preview :post="p.repost"/>
 			</div>
 		</div>
-		<router-link class="time" :to="`/@${p.user.username}/${p.id}`">
+		<router-link class="time" :to="`/@${pAcct}/${p.id}`">
 			<mk-time :time="p.created_at" mode="detail"/>
 		</router-link>
 		<footer>
@@ -80,6 +80,7 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../common/user/get-acct';
 import MkPostMenu from '../../../common/views/components/post-menu.vue';
 import MkReactionPicker from '../../../common/views/components/reaction-picker.vue';
 import XSub from './post-detail.sub.vue';
@@ -105,6 +106,12 @@ export default Vue.extend({
 		};
 	},
 	computed: {
+		acct() {
+			return getAcct(this.post.user);
+		},
+		pAcct() {
+			return getAcct(this.p.user);
+		},
 		isRepost(): boolean {
 			return (this.post.repost &&
 				this.post.text == null &&
diff --git a/src/web/app/mobile/views/components/post-preview.vue b/src/web/app/mobile/views/components/post-preview.vue
index 787e1a3a74..0bd0a355b3 100644
--- a/src/web/app/mobile/views/components/post-preview.vue
+++ b/src/web/app/mobile/views/components/post-preview.vue
@@ -1,13 +1,13 @@
 <template>
 <div class="mk-post-preview">
-	<router-link class="avatar-anchor" :to="`/@${post.user.username}`">
+	<router-link class="avatar-anchor" :to="`/@${acct}`">
 		<img class="avatar" :src="`${post.user.avatar_url}?thumbnail&size=64`" alt="avatar"/>
 	</router-link>
 	<div class="main">
 		<header>
-			<router-link class="name" :to="`/@${post.user.username}`">{{ post.user.name }}</router-link>
-			<span class="username">@{{ post.user.username }}</span>
-			<router-link class="time" :to="`/@${post.user.username}/${post.id}`">
+			<router-link class="name" :to="`/@${acct}`">{{ post.user.name }}</router-link>
+			<span class="username">@{{ acct }}</span>
+			<router-link class="time" :to="`/@${acct}/${post.id}`">
 				<mk-time :time="post.created_at"/>
 			</router-link>
 		</header>
@@ -20,8 +20,15 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../common/user/get-acct';
+
 export default Vue.extend({
-	props: ['post']
+	props: ['post'],
+	computed: {
+		acct() {
+			return getAcct(this.post.user);
+		}
+	}
 });
 </script>
 
diff --git a/src/web/app/mobile/views/components/post.sub.vue b/src/web/app/mobile/views/components/post.sub.vue
index 2427cefeb6..b6ee7c1e08 100644
--- a/src/web/app/mobile/views/components/post.sub.vue
+++ b/src/web/app/mobile/views/components/post.sub.vue
@@ -1,13 +1,13 @@
 <template>
 <div class="sub">
-	<router-link class="avatar-anchor" :to="`/@${post.user.username}`">
+	<router-link class="avatar-anchor" :to="`/@${acct}`">
 		<img class="avatar" :src="`${post.user.avatar_url}?thumbnail&size=96`" alt="avatar"/>
 	</router-link>
 	<div class="main">
 		<header>
-			<router-link class="name" :to="`/@${post.user.username}`">{{ post.user.name }}</router-link>
-			<span class="username">@{{ post.user.username }}</span>
-			<router-link class="created-at" :to="`/@${post.user.username}/${post.id}`">
+			<router-link class="name" :to="`/@${acct}`">{{ post.user.name }}</router-link>
+			<span class="username">@{{ acct }}</span>
+			<router-link class="created-at" :to="`/@${acct}/${post.id}`">
 				<mk-time :time="post.created_at"/>
 			</router-link>
 		</header>
@@ -20,8 +20,15 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../common/user/get-acct';
+
 export default Vue.extend({
-	props: ['post']
+	props: ['post'],
+	computed: {
+		acct() {
+			return getAcct(this.post.user);
+		}
+	}
 });
 </script>
 
diff --git a/src/web/app/mobile/views/components/post.vue b/src/web/app/mobile/views/components/post.vue
index b8f9e95eee..e5bc964792 100644
--- a/src/web/app/mobile/views/components/post.vue
+++ b/src/web/app/mobile/views/components/post.vue
@@ -5,25 +5,25 @@
 	</div>
 	<div class="repost" v-if="isRepost">
 		<p>
-			<router-link class="avatar-anchor" :to="`/@${post.user.username}`">
+			<router-link class="avatar-anchor" :to="`/@${acct}`">
 				<img class="avatar" :src="`${post.user.avatar_url}?thumbnail&size=64`" alt="avatar"/>
 			</router-link>
 			%fa:retweet%
 			<span>{{ '%i18n:mobile.tags.mk-timeline-post.reposted-by%'.substr(0, '%i18n:mobile.tags.mk-timeline-post.reposted-by%'.indexOf('{')) }}</span>
-			<router-link class="name" :to="`/@${post.user.username}`">{{ post.user.name }}</router-link>
+			<router-link class="name" :to="`/@${acct}`">{{ post.user.name }}</router-link>
 			<span>{{ '%i18n:mobile.tags.mk-timeline-post.reposted-by%'.substr('%i18n:mobile.tags.mk-timeline-post.reposted-by%'.indexOf('}') + 1) }}</span>
 		</p>
 		<mk-time :time="post.created_at"/>
 	</div>
 	<article>
-		<router-link class="avatar-anchor" :to="`/@${p.user.username}`">
+		<router-link class="avatar-anchor" :to="`/@${pAcct}`">
 			<img class="avatar" :src="`${p.user.avatar_url}?thumbnail&size=96`" alt="avatar"/>
 		</router-link>
 		<div class="main">
 			<header>
-				<router-link class="name" :to="`/@${p.user.username}`">{{ p.user.name }}</router-link>
-				<span class="is-bot" v-if="p.user.account.is_bot">bot</span>
-				<span class="username">@{{ p.user.username }}</span>
+				<router-link class="name" :to="`/@${pAcct}`">{{ p.user.name }}</router-link>
+				<span class="is-bot" v-if="p.user.host === null && p.user.account.is_bot">bot</span>
+				<span class="username">@{{ pAcct }}</span>
 				<div class="info">
 					<span class="mobile" v-if="p.via_mobile">%fa:mobile-alt%</span>
 					<router-link class="created-at" :to="url">
@@ -77,6 +77,7 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../common/user/get-acct';
 import MkPostMenu from '../../../common/views/components/post-menu.vue';
 import MkReactionPicker from '../../../common/views/components/reaction-picker.vue';
 import XSub from './post.sub.vue';
@@ -93,6 +94,12 @@ export default Vue.extend({
 		};
 	},
 	computed: {
+		acct() {
+			return getAcct(this.post.user);
+		},
+		pAcct() {
+			return getAcct(this.p.user);
+		},
 		isRepost(): boolean {
 			return (this.post.repost &&
 				this.post.text == null &&
@@ -110,7 +117,7 @@ export default Vue.extend({
 				: 0;
 		},
 		url(): string {
-			return `/@${this.p.user.username}/${this.p.id}`;
+			return `/@${this.pAcct}/${this.p.id}`;
 		},
 		urls(): string[] {
 			if (this.p.ast) {
diff --git a/src/web/app/mobile/views/components/user-card.vue b/src/web/app/mobile/views/components/user-card.vue
index bfc748866a..5a7309cfd3 100644
--- a/src/web/app/mobile/views/components/user-card.vue
+++ b/src/web/app/mobile/views/components/user-card.vue
@@ -1,20 +1,27 @@
 <template>
 <div class="mk-user-card">
 	<header :style="user.banner_url ? `background-image: url(${user.banner_url}?thumbnail&size=1024)` : ''">
-		<a :href="`/@${user.username}`">
+		<a :href="`/@${acct}`">
 			<img :src="`${user.avatar_url}?thumbnail&size=200`" alt="avatar"/>
 		</a>
 	</header>
-	<a class="name" :href="`/@${user.username}`" target="_blank">{{ user.name }}</a>
-	<p class="username">@{{ user.username }}</p>
+	<a class="name" :href="`/@${acct}`" target="_blank">{{ user.name }}</a>
+	<p class="username">@{{ acct }}</p>
 	<mk-follow-button :user="user"/>
 </div>
 </template>
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../common/user/get-acct';
+
 export default Vue.extend({
-	props: ['user']
+	props: ['user'],
+	computed: {
+		acct() {
+			return getAcct(this.user);
+		}
+	}
 });
 </script>
 
diff --git a/src/web/app/mobile/views/components/user-preview.vue b/src/web/app/mobile/views/components/user-preview.vue
index a3db311d12..be80582cac 100644
--- a/src/web/app/mobile/views/components/user-preview.vue
+++ b/src/web/app/mobile/views/components/user-preview.vue
@@ -1,12 +1,12 @@
 <template>
 <div class="mk-user-preview">
-	<router-link class="avatar-anchor" :to="`/@${user.username}`">
+	<router-link class="avatar-anchor" :to="`/@${acct}`">
 		<img class="avatar" :src="`${user.avatar_url}?thumbnail&size=64`" alt="avatar"/>
 	</router-link>
 	<div class="main">
 		<header>
-			<router-link class="name" :to="`/@${user.username}`">{{ user.name }}</router-link>
-			<span class="username">@{{ user.username }}</span>
+			<router-link class="name" :to="`/@${acct}`">{{ user.name }}</router-link>
+			<span class="username">@{{ acct }}</span>
 		</header>
 		<div class="body">
 			<div class="description">{{ user.description }}</div>
@@ -17,8 +17,15 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../common/user/get-acct';
+
 export default Vue.extend({
-	props: ['user']
+	props: ['user'],
+	computed: {
+		acct() {
+			return getAcct(this.user);
+		}
+	}
 });
 </script>
 
diff --git a/src/web/app/mobile/views/pages/followers.vue b/src/web/app/mobile/views/pages/followers.vue
index c2b6b90e29..1edf4e38ad 100644
--- a/src/web/app/mobile/views/pages/followers.vue
+++ b/src/web/app/mobile/views/pages/followers.vue
@@ -19,6 +19,7 @@
 <script lang="ts">
 import Vue from 'vue';
 import Progress from '../../../common/scripts/loading';
+import parseAcct from '../../../../../common/user/parse-acct';
 
 export default Vue.extend({
 	data() {
@@ -41,9 +42,7 @@ export default Vue.extend({
 			Progress.start();
 			this.fetching = true;
 
-			(this as any).api('users/show', {
-				username: this.$route.params.user
-			}).then(user => {
+			(this as any).api('users/show', parseAcct(this.$route.params.user)).then(user => {
 				this.user = user;
 				this.fetching = false;
 
diff --git a/src/web/app/mobile/views/pages/following.vue b/src/web/app/mobile/views/pages/following.vue
index 6365d3b370..0dd171cce1 100644
--- a/src/web/app/mobile/views/pages/following.vue
+++ b/src/web/app/mobile/views/pages/following.vue
@@ -19,6 +19,7 @@
 <script lang="ts">
 import Vue from 'vue';
 import Progress from '../../../common/scripts/loading';
+import parseAcct from '../../../../../common/user/parse-acct';
 
 export default Vue.extend({
 	data() {
@@ -41,9 +42,7 @@ export default Vue.extend({
 			Progress.start();
 			this.fetching = true;
 
-			(this as any).api('users/show', {
-				username: this.$route.params.user
-			}).then(user => {
+			(this as any).api('users/show', parseAcct(this.$route.params.user)).then(user => {
 				this.user = user;
 				this.fetching = false;
 
diff --git a/src/web/app/mobile/views/pages/messaging-room.vue b/src/web/app/mobile/views/pages/messaging-room.vue
index eb5439915a..193c41179c 100644
--- a/src/web/app/mobile/views/pages/messaging-room.vue
+++ b/src/web/app/mobile/views/pages/messaging-room.vue
@@ -10,6 +10,8 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import parseAcct from '../../../../../common/user/parse-acct';
+
 export default Vue.extend({
 	data() {
 		return {
@@ -27,9 +29,7 @@ export default Vue.extend({
 	methods: {
 		fetch() {
 			this.fetching = true;
-			(this as any).api('users/show', {
-				username: (this as any).$route.params.username
-			}).then(user => {
+			(this as any).api('users/show', parseAcct(this.$route.params.user)).then(user => {
 				this.user = user;
 				this.fetching = false;
 
diff --git a/src/web/app/mobile/views/pages/messaging.vue b/src/web/app/mobile/views/pages/messaging.vue
index e0fdb4944d..e92068eda5 100644
--- a/src/web/app/mobile/views/pages/messaging.vue
+++ b/src/web/app/mobile/views/pages/messaging.vue
@@ -7,6 +7,8 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../common/user/get-acct';
+
 export default Vue.extend({
 	mounted() {
 		document.title = 'Misskey %i18n:mobile.tags.mk-messaging-page.message%';
@@ -14,7 +16,7 @@ export default Vue.extend({
 	},
 	methods: {
 		navigate(user) {
-			(this as any).$router.push(`/i/messaging/${user.username}`);
+			(this as any).$router.push(`/i/messaging/${getAcct(user)}`);
 		}
 	}
 });
diff --git a/src/web/app/mobile/views/pages/user.vue b/src/web/app/mobile/views/pages/user.vue
index ba66052e04..7ff897e42d 100644
--- a/src/web/app/mobile/views/pages/user.vue
+++ b/src/web/app/mobile/views/pages/user.vue
@@ -13,15 +13,15 @@
 				</div>
 				<div class="title">
 					<h1>{{ user.name }}</h1>
-					<span class="username">@{{ user.username }}</span>
+					<span class="username">@{{ acct }}</span>
 					<span class="followed" v-if="user.is_followed">%i18n:mobile.tags.mk-user.follows-you%</span>
 				</div>
 				<div class="description">{{ user.description }}</div>
 				<div class="info">
-					<p class="location" v-if="user.account.profile.location">
+					<p class="location" v-if="user.host === null && user.account.profile.location">
 						%fa:map-marker%{{ user.account.profile.location }}
 					</p>
-					<p class="birthday" v-if="user.account.profile.birthday">
+					<p class="birthday" v-if="user.host === null && user.account.profile.birthday">
 						%fa:birthday-cake%{{ user.account.profile.birthday.replace('-', '年').replace('-', '月') + '日' }} ({{ age }}歳)
 					</p>
 				</div>
@@ -30,11 +30,11 @@
 						<b>{{ user.posts_count | number }}</b>
 						<i>%i18n:mobile.tags.mk-user.posts%</i>
 					</a>
-					<a :href="`@${user.username}/following`">
+					<a :href="`@${acct}/following`">
 						<b>{{ user.following_count | number }}</b>
 						<i>%i18n:mobile.tags.mk-user.following%</i>
 					</a>
-					<a :href="`@${user.username}/followers`">
+					<a :href="`@${acct}/followers`">
 						<b>{{ user.followers_count | number }}</b>
 						<i>%i18n:mobile.tags.mk-user.followers%</i>
 					</a>
@@ -60,6 +60,8 @@
 <script lang="ts">
 import Vue from 'vue';
 import * as age from 's-age';
+import getAcct from '../../../../../common/user/get-acct';
+import getAcct from '../../../../../common/user/parse-acct';
 import Progress from '../../../common/scripts/loading';
 import XHome from './user/home.vue';
 
@@ -75,6 +77,9 @@ export default Vue.extend({
 		};
 	},
 	computed: {
+		acct() {
+			return this.getAcct(this.user);
+		},
 		age(): number {
 			return age(this.user.account.profile.birthday);
 		}
@@ -92,9 +97,7 @@ export default Vue.extend({
 		fetch() {
 			Progress.start();
 
-			(this as any).api('users/show', {
-				username: this.$route.params.user
-			}).then(user => {
+			(this as any).api('users/show', parseAcct(this.$route.params.user)).then(user => {
 				this.user = user;
 				this.fetching = false;
 
diff --git a/src/web/app/mobile/views/pages/user/home.followers-you-know.vue b/src/web/app/mobile/views/pages/user/home.followers-you-know.vue
index 7b02020b10..1a2b8f7083 100644
--- a/src/web/app/mobile/views/pages/user/home.followers-you-know.vue
+++ b/src/web/app/mobile/views/pages/user/home.followers-you-know.vue
@@ -2,7 +2,7 @@
 <div class="root followers-you-know">
 	<p class="initializing" v-if="fetching">%fa:spinner .pulse .fw%%i18n:mobile.tags.mk-user-overview-followers-you-know.loading%<mk-ellipsis/></p>
 	<div v-if="!fetching && users.length > 0">
-		<a v-for="user in users" :key="user.id" :href="`/@${user.username}`">
+		<a v-for="user in users" :key="user.id" :href="`/@${getAcct(user)}`">
 			<img :src="`${user.avatar_url}?thumbnail&size=64`" :alt="user.name"/>
 		</a>
 	</div>
@@ -12,6 +12,8 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../../common/user/get-acct';
+
 export default Vue.extend({
 	props: ['user'],
 	data() {
@@ -20,6 +22,9 @@ export default Vue.extend({
 			users: []
 		};
 	},
+	methods: {
+		getAcct
+	},
 	mounted() {
 		(this as any).api('users/followers', {
 			user_id: this.user.id,
diff --git a/src/web/app/mobile/views/pages/user/home.photos.vue b/src/web/app/mobile/views/pages/user/home.photos.vue
index 385e5b8dd6..f12f59a407 100644
--- a/src/web/app/mobile/views/pages/user/home.photos.vue
+++ b/src/web/app/mobile/views/pages/user/home.photos.vue
@@ -5,7 +5,7 @@
 		<a v-for="image in images"
 			class="img"
 			:style="`background-image: url(${image.media.url}?thumbnail&size=256)`"
-			:href="`/@${image.post.user.username}/${image.post.id}`"
+			:href="`/@${getAcct(image.post.user)}/${image.post.id}`"
 		></a>
 	</div>
 	<p class="empty" v-if="!fetching && images.length == 0">%i18n:mobile.tags.mk-user-overview-photos.no-photos%</p>
@@ -14,6 +14,8 @@
 
 <script lang="ts">
 import Vue from 'vue';
+import getAcct from '../../../../../../common/user/get-acct';
+
 export default Vue.extend({
 	props: ['user'],
 	data() {
@@ -22,6 +24,9 @@ export default Vue.extend({
 			images: []
 		};
 	},
+	methods: {
+		getAcct
+	},
 	mounted() {
 		(this as any).api('users/posts', {
 			user_id: this.user.id,
diff --git a/src/web/app/mobile/views/pages/user/home.vue b/src/web/app/mobile/views/pages/user/home.vue
index dabb3f60b8..e3def61512 100644
--- a/src/web/app/mobile/views/pages/user/home.vue
+++ b/src/web/app/mobile/views/pages/user/home.vue
@@ -31,7 +31,7 @@
 			<x-followers-you-know :user="user"/>
 		</div>
 	</section>
-	<p>%i18n:mobile.tags.mk-user-overview.last-used-at%: <b><mk-time :time="user.account.last_used_at"/></b></p>
+	<p v-if="user.host === null">%i18n:mobile.tags.mk-user-overview.last-used-at%: <b><mk-time :time="user.account.last_used_at"/></b></p>
 </div>
 </template>