redirect /remote-users/:username@:hostname -> /users/:id, /remote-users/:hostname/:username -> /users/:id

src/components/remote_user_resolver/remote_user_resolver.js

@@ -0,0 +1,31 @@
+const RemoteUserResolver = {
+  data: () => ({
+    error: false
+  }),
+  mounted () {
+    this.redirect()
+  },
+  methods: {
+    redirect () {
+      const acct = this.$route.params.username + '@' + this.$route.params.hostname
+      this.$store.state.api.backendInteractor.fetchUser({ id: acct })
+        .then((externalUser) => {
+          if (externalUser.error) {
+            this.error = true
+          } else {
+            this.$store.commit('addNewUsers', [externalUser])
+            const id = externalUser.id
+            this.$router.replace({
+              name: 'external-user-profile',
+              params: { id }
+            })
+          }
+        })
+        .catch(() => {
+          this.error = true
+        })
+    }
+  }
+}
+
+export default RemoteUserResolver

src/components/remote_user_resolver/remote_user_resolver.vue

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+<template>
+  <div class="panel panel-default">
+    <div class="panel-heading">
+      {{ $t('remote_user_resolver.remote_user_resolver') }}
+    </div>
+    <div class="panel-body">
+      <p>
+        {{ $t('remote_user_resolver.searching_for') }} @{{ $route.params.username }}@{{ $route.params.hostname }}
+      </p>
+      <p v-if="error">
+        {{ $t('remote_user_resolver.error') }}
+      </p>
+    </div>
+  </div>
+</template>
+
+<script src="./remote_user_resolver.js"></script>
+
+<style lang="scss">
+</style>