Add media viewer module and media module component, modify attachment behavior

src/components/media_modal/media_modal.js

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+import StillImage from '../still-image/still-image.vue'
+import fileTypeService from '../../services/file_type/file_type.service.js'
+
+const MediaModal = {
+  data () {
+    return {
+      loopVideo: this.$store.state.config.loopVideo
+    }
+  },
+  components: {
+    StillImage
+  },
+  computed: {
+    showing () {
+      return this.$store.state.mediaViewer.activated
+    },
+    currentIndex () {
+      return this.$store.state.mediaViewer.currentIndex
+    },
+    currentMedia () {
+      return this.$store.state.mediaViewer.media[this.currentIndex]
+    },
+    type () {
+      return this.currentMedia ? fileTypeService.fileType(this.currentMedia.mimetype) : null
+    }
+  },
+  methods: {
+    hide () {
+      this.$store.dispatch('closeMediaViewer')
+    },
+    onVideoDataLoad (e) {
+      if (typeof e.srcElement.webkitAudioDecodedByteCount !== 'undefined') {
+        // non-zero if video has audio track
+        if (e.srcElement.webkitAudioDecodedByteCount > 0) {
+          this.loopVideo = this.loopVideo && !this.$store.state.config.loopVideoSilentOnly
+        }
+      } else if (typeof e.srcElement.mozHasAudio !== 'undefined') {
+        // true if video has audio track
+        if (e.srcElement.mozHasAudio) {
+          this.loopVideo = this.loopVideo && !this.$store.state.config.loopVideoSilentOnly
+        }
+      } else if (typeof e.srcElement.audioTracks !== 'undefined') {
+        if (e.srcElement.audioTracks.length > 0) {
+          this.loopVideo = this.loopVideo && !this.$store.state.config.loopVideoSilentOnly
+        }
+      }
+    }
+  }
+}
+
+export default MediaModal

src/components/media_modal/media_modal.vue

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+<template>
+  <div class="modal-view" v-if="showing" @click.prevent="hide">
+    <img class="modal-image" v-if="type === 'image'" :src="currentMedia.url"></img>
+    <video
+      class="modal-image"
+      v-if="type === 'video'"
+      :src="currentMedia.url"
+      @click.stop=""
+      controls autoplay
+      :loop="loopVideo"
+      @loadeddata="onVideoDataLoad">
+    </video>
+  </div>
+</template>
+
+<script src="./media_modal.js"></script>
+
+<style lang="scss">
+@import '../../_variables.scss';
+
+.modal-view {
+  z-index: 1005;
+  position: fixed;
+  width: 100vw;
+  height: 100vh;
+  top: 0;
+  left: 0;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  background-color: rgba(0, 0, 0, 0.5);
+  cursor: pointer;
+}
+
+.modal-image {
+  max-width: 90%;
+  max-height: 90%;
+  box-shadow: 0px 5px 15px 0 rgba(0, 0, 0, 0.5);
+}
+</style>