Emojis in notifications; server caching

README.md

@@ -213,6 +213,6 @@ Third party libraries and resources:
 * [GoReleaser](https://goreleaser.com/) (MIT) is used to create releases
 * [github.com/mattn/go-sqlite3](https://github.com/mattn/go-sqlite3) (MIT) is used to provide the persistent message cache
 * [Firebase Admin SDK](https://github.com/firebase/firebase-admin-go) (Apache 2.0) is used to send FCM messages
-* [emoji-java](https://github.com/vdurmont/emoji-java) (MIT) is used for emoji support (the emoji.json file only) 
+* [github/gemoji](https://github.com/github/gemoji) (MIT) is used for emoji support (specifically the [emoji.json](https://raw.githubusercontent.com/github/gemoji/master/db/emoji.json) file)
 * [Lightbox with vanilla JS](https://yossiabramov.com/blog/vanilla-js-lightbox) 
 * [Statically linking go-sqlite3](https://www.arp242.net/static-go.html)

server/index.gohtml

@@ -85,7 +85,7 @@
         curl \<br/>
         &nbsp;&nbsp;-H "Title: Unauthorized access detected" \<br/>
         &nbsp;&nbsp;-H "Priority: urgent" \<br/>
-        &nbsp;&nbsp;-H "Tags: warn,skull" \<br/>
+        &nbsp;&nbsp;-H "Tags: warning,skull" \<br/>
         &nbsp;&nbsp;-d "Remote access to $(hostname) detected. Act right away." \<br/>
         &nbsp;&nbsp;<span class="ntfyUrl">ntfy.sh</span>/mytopic
     </code>
@@ -228,16 +228,22 @@
         curl -H "Title: Dogs are better than cats" -d "Oh my ..." <span class="ntfyUrl">ntfy.sh</span>/mytopic<br/>
     </code>
 
-    <h3 id="tags" class="anchor">Tagging messages (<tt>X-Tags</tt>, <tt>Tags</tt>, or <tt>ta</tt>)</h3>
+    <h3 id="tags" class="anchor">Tags &amp; emojis 🥳 🎉 (<tt>X-Tags</tt>, <tt>Tags</tt>, or <tt>ta</tt>)</h3>
+    <p>
+        You can tag messages with emojis (or other relevant strings). If a tag matches a <a href="https://raw.githubusercontent.com/github/gemoji/master/db/emoji.json">known emoji short code</a>,
+        it will be converted to an emoji. If it doesn't match, it will be listed below the notification. This is useful
+        for things like warnings and such (⚠️, ️🚨, or 🚩), but also to simply tag messages otherwise (e.g. which script the
+        message came from, ...).
+    </p>
     <p class="smallMarginBottom">
-        You can tag notifications with emojis (or other relevant strings). In the phone app, the tags will be converted
+        You can set tags with the <tt>X-Tags</tt> header (or any of its aliases: <tt>Tags</tt>, or <tt>ta</tt>).
-        to emojis and prepended to the message or title in the notification. You can set tags with the <tt>X-Tags</tt> header
+        Use <a href="https://raw.githubusercontent.com/github/gemoji/master/db/emoji.json">this reference</a>
-        (or any of its aliases: <tt>Tags</tt>, or <tt>ta</tt>). Use <a href="https://github.com/vdurmont/emoji-java/blob/master/EMOJIS.md">this reference</a>
+        to figure out what tags can be converted to emojis. In the example below, the tag "warning" matches the emoji ⚠️,
-        to figure out what tags you can use to send emojis.
+        the tag "ssh-login" doesn't match and will be displayed below the message.
     </p>
     <code>
-        curl -H "Tags: warn,skull" -d "Unauthorized SSH access" <span class="ntfyUrl">ntfy.sh</span>/mytopic<br/>
+        $ curl -H "Tags: warning,ssh-login" -d "Unauthorized SSH access" <span class="ntfyUrl">ntfy.sh</span>/mytopic<br/>
-        curl -H tags:thumbsup -d "Backup successful" <span class="ntfyUrl">ntfy.sh</span>/mytopic<br/>
+        {"id":"ZEIwjfHlSS",...,"tags":["warning","ssh-login"],"message":"Unauthorized SSH access"}
     </code>
 
     <h2 id="examples" class="anchor">Examples</h2>
@@ -257,7 +263,7 @@
         rsync -a root@laptop /backups/laptop \<br/>
         &nbsp;&nbsp;&& zfs snapshot ... \<br/>
         &nbsp;&nbsp;&& curl -d "Laptop backup succeeded" <span class="ntfyUrl">ntfy.sh</span>/backups \<br/>
-        &nbsp;&nbsp;|| curl -H tags:warn -H prio:high -d "Laptop backup failed" <span class="ntfyUrl">ntfy.sh</span>/backups
+        &nbsp;&nbsp;|| curl -H tags:warning -H prio:high -d "Laptop backup failed" <span class="ntfyUrl">ntfy.sh</span>/backups
     </code>
 
     <h3 id="example-web" class="anchor">Example: Server-sent messages in your web app</h3>
@@ -284,7 +290,7 @@
     <code>
         #!/bin/bash<br/>
         if [ "${PAM_TYPE}" = "open_session" ]; then<br/>
-        &nbsp;&nbsp;curl -H tags:warn -d "SSH login: ${PAM_USER} from ${PAM_RHOST}" <span class="ntfyUrl">ntfy.sh</span>/alerts<br/>
+        &nbsp;&nbsp;curl -H tags:warning -d "SSH login: ${PAM_USER} from ${PAM_RHOST}" <span class="ntfyUrl">ntfy.sh</span>/alerts<br/>
         fi
     </code>
 
@@ -405,6 +411,7 @@
     </div>
 </div>
 <div id="lightbox" class="lightbox"></div>
+<script src="static/js/emoji.js"></script>
 <script src="static/js/app.js"></script>
 </body>
 </html>

server/server.go

@@ -93,6 +93,7 @@ var (
 
 	//go:embed static
 	webStaticFs       embed.FS
+	webStaticFsCached = &util.CachingEmbedFS{ModTime: time.Now(), FS: webStaticFs}
 
 	errHTTPBadRequest      = &errHTTP{http.StatusBadRequest, http.StatusText(http.StatusBadRequest)}
 	errHTTPNotFound        = &errHTTP{http.StatusNotFound, http.StatusText(http.StatusNotFound)}
@@ -231,7 +232,7 @@ func (s *Server) handleExample(w http.ResponseWriter, r *http.Request) error {
 }
 
 func (s *Server) handleStatic(w http.ResponseWriter, r *http.Request) error {
-	http.FileServer(http.FS(webStaticFs)).ServeHTTP(w, r)
+	http.FileServer(http.FS(webStaticFsCached)).ServeHTTP(w, r)
 	return nil
 }
 

server/static/js/app.js

@@ -86,9 +86,10 @@ const subscribeInternal = (topic, persist, delaySec) => {
             }
             if (Notification.permission === "granted") {
                 notifySound.play();
-                const title = (event.title) ? event.title : `${location.host}/${topic}`;
+                const title = formatTitle(event);
+                const message = formatMessage(event);
                 const notification = new Notification(title, {
-                    body: event.message,
+                    body: message,
                     icon: '/static/img/favicon.png'
                 });
                 notification.onclick = (e) => {
@@ -158,56 +159,28 @@ const rerenderDetailView = () => {
         const messageDiv = document.createElement('div');
         const tagsDiv = document.createElement('div');
 
-        // Figure out mapped emojis (and unmapped tags)
-        let mappedEmojiTags = '';
-        let unmappedTags = '';
-        if (m.tags) {
-            mappedEmojiTags = m.tags
-                .filter(tag => tag in emojis)
-                .map(tag => emojis[tag])
-                .join("");
-            unmappedTags = m.tags
-                .filter(tag => !(tag in emojis))
-                .join(", ");
-        }
-
-        // Figure out title and message
-        let title = '';
-        let message = m.message;
-        if (m.title) {
-            if (mappedEmojiTags) {
-                title = `${mappedEmojiTags} ${m.title}`;
-            } else {
-                title = m.title;
-            }
-        } else {
-            if (mappedEmojiTags) {
-                message = `${mappedEmojiTags} ${m.message}`;
-            } else {
-                message = m.message;
-            }
-        }
-
         entryDiv.classList.add('detailEntry');
         dateDiv.classList.add('detailDate');
+        titleDiv.classList.add('detailTitle');
+        messageDiv.classList.add('detailMessage');
+        tagsDiv.classList.add('detailTags');
+
         const dateStr = new Date(m.time * 1000).toLocaleString();
         if (m.priority && [1,2,4,5].includes(m.priority)) {
             dateDiv.innerHTML = `${dateStr} <img src="static/img/priority-${m.priority}.svg"/>`;
         } else {
             dateDiv.innerHTML = `${dateStr}`;
         }
-        messageDiv.classList.add('detailMessage');
+        messageDiv.innerText = formatMessage(m);
-        messageDiv.innerText = message;
         entryDiv.appendChild(dateDiv);
         if (m.title) {
-            titleDiv.classList.add('detailTitle');
+            titleDiv.innerText = formatTitleA(m);
-            titleDiv.innerText = title;
             entryDiv.appendChild(titleDiv);
         }
         entryDiv.appendChild(messageDiv);
-        if (unmappedTags) {
+        const otherTags = unmatchedTags(m.tags);
-            tagsDiv.classList.add('detailTags');
+        if (otherTags.length > 0) {
-            tagsDiv.innerText = `Tags: ${unmappedTags}`;
+            tagsDiv.innerText = `Tags: ${otherTags.join(", ")}`;
             entryDiv.appendChild(tagsDiv);
         }
         detailEventsList.appendChild(entryDiv);
@@ -311,10 +284,46 @@ const nextScreenshotKeyboardListener = (e) => {
     }
 };
 
-const toEmoji = (tag) => {
+const formatTitle = (m) => {
-    emojis
+    if (m.title) {
+        return formatTitleA(m);
+    } else {
+        return `${location.host}/${m.topic}`;
+    }
 };
 
+const formatTitleA = (m) => {
+    const emojiList = toEmojis(m.tags);
+    if (emojiList) {
+        return `${emojiList.join(" ")} ${m.title}`;
+    } else {
+        return m.title;
+    }
+};
+
+const formatMessage = (m) => {
+    if (m.title) {
+        return m.message;
+    } else {
+        const emojiList = toEmojis(m.tags);
+        if (emojiList) {
+            return `${emojiList.join(" ")} ${m.message}`;
+        } else {
+            return m.message;
+        }
+    }
+};
+
+const toEmojis = (tags) => {
+    if (!tags) return [];
+    else return tags.filter(tag => tag in emojis).map(tag => emojis[tag]);
+}
+
+const unmatchedTags = (tags) => {
+    if (!tags) return [];
+    else return tags.filter(tag => !(tag in emojis));
+}
+
 // From: https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API/Using_Fetch
 async function* makeTextFileLineIterator(fileURL) {
     const utf8Decoder = new TextDecoder('utf-8');
@@ -417,14 +426,10 @@ document.querySelectorAll('.ntfyProtocol').forEach((el) => {
     el.innerHTML = window.location.protocol + "//";
 });
 
-// Fetch emojis
+// Format emojis (see emoji.js)
 const emojis = {};
-fetch('static/js/emoji.json')
+rawEmojis.forEach(emoji => {
-    .then(response => response.json())
-    .then(data => {
-        data.forEach(emoji => {
     emoji.aliases.forEach(alias => {
         emojis[alias] = emoji.emoji;
     });
 });
-    });

server/static/js/emoji.js

@@ -1,4 +1,7 @@
-[
+// Original data source: https://github.com/github/gemoji/blob/master/db/emoji.json
+// Manually prepended "const rawEmojis = " to make it play nice with JS/HTML.
+
+const rawEmojis = [
   {
     "emoji": "😀"
   , "description": "grinning face"

util/embedfs.go

@@ -0,0 +1,79 @@
+package util
+
+import (
+	"embed"
+	"errors"
+	"io"
+	"io/fs"
+	"time"
+)
+
+type CachingEmbedFS struct {
+	ModTime time.Time
+	FS      embed.FS
+}
+
+func (e CachingEmbedFS) Open(name string) (fs.File, error) {
+	f, err := e.FS.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	return &cachingEmbedFile{f, e.ModTime}, nil
+}
+
+type cachingEmbedFile struct {
+	file    fs.File
+	modTime time.Time
+}
+
+func (f cachingEmbedFile) Stat() (fs.FileInfo, error) {
+	s, err := f.file.Stat()
+	if err != nil {
+		return nil, err
+	}
+	return &etagEmbedFileInfo{s, f.modTime}, nil
+}
+
+func (f cachingEmbedFile) Read(bytes []byte) (int, error) {
+	return f.file.Read(bytes)
+}
+
+func (f *cachingEmbedFile) Seek(offset int64, whence int) (int64, error) {
+	if seeker, ok := f.file.(io.Seeker); ok {
+		return seeker.Seek(offset, whence)
+	}
+	return 0, errors.New("io.Seeker not implemented")
+}
+
+func (f cachingEmbedFile) Close() error {
+	return f.file.Close()
+}
+
+type etagEmbedFileInfo struct {
+	file    fs.FileInfo
+	modTime time.Time
+}
+
+func (e etagEmbedFileInfo) Name() string {
+	return e.file.Name()
+}
+
+func (e etagEmbedFileInfo) Size() int64 {
+	return e.file.Size()
+}
+
+func (e etagEmbedFileInfo) Mode() fs.FileMode {
+	return e.file.Mode()
+}
+
+func (e etagEmbedFileInfo) ModTime() time.Time {
+	return e.modTime // We override this!
+}
+
+func (e etagEmbedFileInfo) IsDir() bool {
+	return e.file.IsDir()
+}
+
+func (e etagEmbedFileInfo) Sys() interface{} {
+	return e.file.Sys()
+}