add mentions notifications

src/devhub/entity/community/Compose.jsx

@@ -22,6 +22,36 @@ const content = {
   text: state.text,
 };
 
+function extractMentions(text) {
+  const mentionRegex =
+    /@((?:(?:[a-z\d]+[-_])*[a-z\d]+\.)*(?:[a-z\d]+[-_])*[a-z\d]+)/gi;
+  mentionRegex.lastIndex = 0;
+  const accountIds = new Set();
+  for (const match of text.matchAll(mentionRegex)) {
+    if (
+      !/[\w`]/.test(match.input.charAt(match.index - 1)) &&
+      !/[/\w`]/.test(match.input.charAt(match.index + match[0].length)) &&
+      match[1].length >= 2 &&
+      match[1].length <= 64
+    ) {
+      accountIds.add(match[1].toLowerCase());
+    }
+  }
+  return [...accountIds];
+}
+
+function extractTagNotifications(text, item) {
+  return extractMentions(text || "")
+    .filter((accountId) => accountId !== context.accountId)
+    .map((accountId) => ({
+      key: accountId,
+      value: {
+        type: "mention",
+        item,
+      },
+    }));
+}
+
 function composeData() {
   const data = {
     post: {
@@ -37,6 +67,17 @@ function composeData() {
     },
   };
 
+  const notifications = extractTagNotifications(state.text, {
+    type: "social",
+    path: `${context.accountId}/post/main`,
+  });
+
+  if (notifications.length) {
+    data.index.notify = JSON.stringify(
+      notifications.length > 1 ? notifications : notifications[0]
+    );
+  }
+
   return data;
 }