From 4e9aecc30467a2a3eff622aaa051fe93b8da5f3d Mon Sep 17 00:00:00 2001
From: N Pex <npexdev@gmail.com>
Date: Wed, 18 Oct 2023 15:05:50 +0000
Subject: [PATCH] Support chat backgrounds

---
 README.md                     | 13 ++++++
 src/assets/css/chat.scss      | 80 +++++++++++++----------------------
 src/components/Chat.vue       | 58 ++++++++++++++++++++++---
 src/components/RoomExport.vue |  2 +-
 4 files changed, 97 insertions(+), 56 deletions(-)

diff --git a/README.md b/README.md
index e100dcd..72b3262 100644
--- a/README.md
+++ b/README.md
@@ -59,5 +59,18 @@ The app loads runtime configutation from the server at "./config.json" and merge
 * Insert the resulting config blob into the "shortCodeStickers" value of the config file (assets/config.json)
 * Rearrange order of sticker packs by editing the config blob above.
 
+### Chat backgrounds
+Chat backgrounds can be set using the **chat_backgrounds** config value. It can be set per room type, "direct", "invite" and "public". If no background is set for the current room type, the app will also check if a default "all" value has any backgrounds specified.
+    Backgrounds are entered as an array. Which of the backgrounds in the array is used for a given room is calculated from the room ID, so that it is constant across the lifetime of the room.
+
+```
+chat_backgrounds: {
+    "direct": ["https://example.com/dm1.png", "data:image/png;base64,yadiyada..."],
+    "all": ["/default_background.png"]
+}
+```
+
+
+
 ### Attributions
 Sounds from [Notification Sounds](https://notificationsounds.com)
\ No newline at end of file
diff --git a/src/assets/css/chat.scss b/src/assets/css/chat.scss
index 650e324..7a6bca8 100644
--- a/src/assets/css/chat.scss
+++ b/src/assets/css/chat.scss
@@ -8,7 +8,7 @@ $admin-fg: white;
 
 body {
   --v-app-background: $app-background;
-  --v-background-color: white;
+  --v-background-color: rgba(255, 255, 255, 0.8);
   --v-foreground-color: black;
   --v-secondary-color: #242424;
   --v-divider-color: #eeeeee;
@@ -233,20 +233,15 @@ body {
     }
   }
 
-  .input-area {
-    background-color: #e2e2e2;
-    margin: 0;
-    padding-left: $chat-standard-padding-s;
-    padding-right: $chat-standard-padding-s;
-  }
-
   .input-area-outer {
     position: relative;
-    background-color: #ffffff;
+    background-color: var(--v-background-color);
     margin: 0;
+    margin-bottom: -10px;
     padding-left: 2 * $chat-standard-padding-s;
     padding-right: 2 * $chat-standard-padding-s;
     padding-top: 0;
+    padding-bottom: 10px;
 
     &.reply-to {
       padding: 0;
@@ -283,9 +278,9 @@ body {
       background-color: white;
       border: 1px solid #d4d4d4;
       border-radius: 32px;
-
+      margin-bottom: 10px;
       @media #{map-get($display-breakpoints, 'sm-and-down')} {
-        margin-bottom: 2px;
+        margin-bottom: 12px;
       }
     }
     .input-area-button {
@@ -423,7 +418,7 @@ body {
   }
   position: relative;
   .bubble {
-    background-color: #ededed;
+    background-color: rgba(#ededed,0.8);
     border-radius: 0px 10px 10px 10px;
     [dir="rtl"] & {
       border-radius: 10px 0px 10px 0px;
@@ -437,7 +432,7 @@ body {
     max-width: 70%;
   }
   &.from-admin .bubble {
-    background-color: $admin-bg;
+    background-color: rgba($admin-bg,0.8);
   }
   .audio-bubble {
     width: 70%;
@@ -516,7 +511,7 @@ body {
   }
   position: relative;
   .bubble {
-    background-color: #e5e5e5;
+    background-color: rgba(#e5e5e5,0.8);
     border-radius: 10px 10px 0 10px;
     [dir="rtl"] & {
       border-radius: 10px 10px 10px 0px;
@@ -527,7 +522,7 @@ body {
     max-width: 70%;
   }
   .audio-bubble {
-    background-color: #e5e5e5;
+    background-color: rgba(#e5e5e5,0.8);
     border-radius: 10px 10px 0 10px;
     [dir="rtl"] & {
       border-radius: 10px 10px 10px 0px;
@@ -539,13 +534,6 @@ body {
     width: 70%;
     height: 50px;
   }
-  .video2-bubble {
-    background-color: #e5e5e5;
-    border-radius: 10px 10px 0 10px;
-    [dir="rtl"] & {
-      border-radius: 10px 10px 10px 0px;
-    }
-  }
   .bubble.image-bubble {
     padding: 0px;
     display: inline-block;
@@ -824,11 +812,8 @@ body {
 .read-marker {
   margin-left: 20px;
   margin-right: 20px;
-  height: 1px;
   width: calc(100% - 40px);
   line-height: var(--v-theme-title-featured-line-height);
-  position: absolute;
-  bottom: 0;
   font-family: sans-serif;
   font-style: normal;
   font-weight: normal;
@@ -837,19 +822,18 @@ body {
   /* identical to box height, or 14px */
   letter-spacing: 0.29px;
   color: #c0c0c0;
-  background-color: #c0c0c0;
   text-align: center;
-  &::after {
-    position: absolute;
-    top: -4px;
-    background: white;
-    transform: translate(-50%, 0);
-    [dir="rtl"] & {
-      transform: translate(50%, 0);
-    }
-    padding-left: 4px;
-    padding-right: 4px;
-    content: attr(title);
+  display: flex;
+  align-items: center;
+  & div.text {
+    flex: 0 0 auto;
+    padding-left: 10px;
+    padding-right: 10px;
+  }
+  & div.line {
+    background: #c0c0c0;
+    height: 1px;
+    flex: 1 1 auto;
   }
 }
 
@@ -858,7 +842,6 @@ body {
   margin-right: 20px;
   margin-top: 20px;
   margin-bottom: 20px;
-  height: 1px;
   line-height: var(--v-theme-title-featured-line-height);
   font-family: sans-serif;
   font-style: normal;
@@ -868,20 +851,17 @@ body {
   /* identical to box height, or 14px */
   letter-spacing: 0.29px;
   color: black;
-  background-color: black;
-  text-align: center;
-  position: relative;
-  &::after {
-    position: absolute;
-    top: -8px;
-    background: white;
-    transform: translate(-50%, 0);
-    [dir="rtl"] & {
-      transform: translate(50%, 0);
-    }
+  display: flex;
+  align-items: center;
+  & div.text {
+    flex: 0 0 auto;
     padding-left: 10px;
     padding-right: 10px;
-    content: attr(title);
+  }
+  & div.line {
+    background: black;
+    height: 1px;
+    flex: 1 1 auto;
   }
 }
 
diff --git a/src/components/Chat.vue b/src/components/Chat.vue
index 64d365b..c21c6ed 100644
--- a/src/components/Chat.vue
+++ b/src/components/Chat.vue
@@ -1,5 +1,5 @@
 <template>
-  <div class="chat-root fill-height d-flex flex-column">
+  <div class="chat-root fill-height d-flex flex-column" :style="chatContainerStyle">
     <ChatHeaderPrivate class="chat-header flex-grow-0 flex-shrink-0"
       v-on:header-click="onHeaderClick"
       v-on:view-room-details="viewRoomDetails"
@@ -62,7 +62,7 @@
 
       <div v-for="(event, index) in filteredEvents" :key="event.getId()" :eventId="event.getId()">
         <!-- DAY Marker, shown for every new day in the timeline -->
-        <div v-if="showDayMarkerBeforeEvent(event) && !!componentForEvent(event, isForExport = false)" class="day-marker" :title="dayForEvent(event)" />
+        <div v-if="showDayMarkerBeforeEvent(event) && !!componentForEvent(event, isForExport = false)" class="day-marker"><div class="line"></div><div class="text">{{ dayForEvent(event) }}</div><div class="line"></div></div>
 
         <div v-if="!event.isRelation() && !event.isRedaction()" :ref="event.getId()">
           <div class="message-wrapper" v-on:touchstart="
@@ -82,8 +82,7 @@
               />
             <!-- <div v-if="debugging" style="user-select:text">EventID: {{ event.getId() }}</div> -->
             <!-- <div v-if="debugging" style="user-select:text">Event: {{ JSON.stringify(event) }}</div> -->
-            <div v-if="event.getId() == readMarker && index < filteredEvents.length - 1" class="read-marker"
-              :title="$t('message.unread_messages')" />
+            <div v-if="event.getId() == readMarker && index < filteredEvents.length - 1" class="read-marker"><div class="line"></div><div class="text">{{ $t('message.unread_messages') }}</div><div class="line"></div></div>
           </div>
         </div>
       </div>
@@ -727,7 +726,11 @@ export default {
     },
 
     isDirectRoom() {
-      return this.room.getJoinRule() == "invite" && this.joinedAndInvitedMembers.length == 2;
+      return this.room && this.room.getJoinRule() == "invite" && this.joinedAndInvitedMembers.length == 2;
+    },
+
+    isPublicRoom() {
+      return this.room && this.room.getJoinRule() == "public";
     },
 
     showCreatedRoomWelcomeHeader() {
@@ -736,6 +739,51 @@ export default {
 
     showDirectChatWelcomeHeader() {
       return !this.hideDirectChatWelcomeHeader && this.roomCreatedByUsRecently && this.isDirectRoom;
+    },
+
+    chatContainerStyle() {
+      if (this.$config.chat_backgrounds && this.room && this.roomId) {
+        const roomType =  this.isDirectRoom ? "direct" : this.isPublicRoom ? "public" : "invite";
+        let backgrounds = this.$config.chat_backgrounds[roomType] || this.$config.chat_backgrounds["all"];
+        if (backgrounds) {
+          const numBackgrounds = backgrounds.length;
+
+          // If we have several backgrounds set, use the room ID to calculate
+          // an int hash value, then take mod of that to select a background to use.
+          // That way, we always get the same one, since room IDs don't change.
+
+          // From: https://stackoverflow.com/questions/7616461/generate-a-hash-from-string-in-javascript
+          const hashCode = function (s) {
+            var hash = 0,
+              i, chr;
+            if (s.length === 0) return hash;
+            for (i = 0; i < s.length; i++) {
+              chr = s.charCodeAt(i);
+              hash = ((hash << 5) - hash) + chr;
+              hash |= 0; // Convert to 32bit integer
+            }
+            return hash;
+          }
+
+          // Adapted from: https://stackoverflow.com/questions/5717093/check-if-a-javascript-string-is-a-url
+          const validUrl = function (s) {
+            let url;
+            try {
+              url = new URL(s, window.location);
+            } catch (err) {
+              return false;
+            }
+            return url.protocol === "http:" || url.protocol === "https:" || url.protocol === "data:";
+          }
+
+          const index = Math.abs(hashCode(this.roomId)) % numBackgrounds;
+          const background = backgrounds[index];
+          if (background && validUrl(background)) {
+            return "background-image: url(" + background + ");background-repeat: repeat";
+          }
+        }
+      }
+      return "";
     }
   },
 
diff --git a/src/components/RoomExport.vue b/src/components/RoomExport.vue
index 38639a5..486ebc5 100644
--- a/src/components/RoomExport.vue
+++ b/src/components/RoomExport.vue
@@ -18,7 +18,7 @@
       <div class="chat-content flex-grow-1 flex-shrink-1" ref="chatContainer">
         <div v-for="(event, index) in events" :key="event.getId()" :eventId="event.getId()">
           <!-- DAY Marker, shown for every new day in the timeline -->
-          <div v-if="showDayMarkerBeforeEvent(event)" class="day-marker" :title="dateForEvent(event)" />
+          <div v-if="showDayMarkerBeforeEvent(event)" class="day-marker"><div class="line"></div><div class="text">{{ dayForEvent(event) }}</div><div class="line"></div></div>
 
           <div v-if="!event.isRelation() && !event.isRedacted() && !event.isRedaction()" :ref="event.getId()">
             <div class="message-wrapper">