Introduce new comment payload (only used in Facebook integration)

packages/mask/background/services/crypto/comment.ts

@@ -2,15 +2,17 @@ import { encodeArrayBuffer, decodeText, decodeArrayBuffer, encodeText } from '@m
 import type { AESCryptoKey } from '@masknet/shared-base'
 
 // * Payload format: 🎶2/4|encrypted_comment:||
+// * Payload format: 🎶3/4|iv|encrypted_comment:||
 export async function encryptComment(
     postIV: Uint8Array<ArrayBuffer>,
     postContent: string,
     comment: string,
 ): Promise<string> {
     const key = await getCommentKey(postIV, postContent)
+    const commentIV = crypto.getRandomValues(new Uint8Array(16))
 
-    const encrypted = await crypto.subtle.encrypt({ name: 'AES-GCM', iv: postIV }, key, encodeText(comment))
-    return `\u{1F3B6}2/4|${encodeArrayBuffer(encrypted)}:||`
+    const encrypted = await crypto.subtle.encrypt({ name: 'AES-GCM', iv: commentIV }, key, encodeText(comment))
+    return `\u{1F3B6}3/4|${encodeArrayBuffer(commentIV)}|${encodeArrayBuffer(encrypted)}:||`
 }
 export async function decryptComment(
     postIV: Uint8Array<ArrayBuffer>,
@@ -21,7 +23,11 @@ export async function decryptComment(
     if (!payload) return null
 
     const key = await getCommentKey(postIV, postContent)
-    const result = await crypto.subtle.decrypt({ name: 'AES-GCM', iv: postIV }, key, decodeArrayBuffer(payload))
+    const result = await crypto.subtle.decrypt(
+        { name: 'AES-GCM', iv: payload[0] || postIV },
+        key,
+        decodeArrayBuffer(payload[1]),
+    )
     return decodeText(result)
 }
 
@@ -39,9 +45,14 @@ async function getCommentKey(postIV: Uint8Array<ArrayBuffer>, postContent: strin
     )) as AESCryptoKey
 }
 
-function extractCommentPayload(text: string) {
-    const [_, toEnd] = text.split('\u{1F3B6}2/4|')
-    const [content, _2] = (toEnd || '').split(':||')
-    if (content.length) return content
-    return
+function extractCommentPayload(text: string): [iv: undefined | Uint8Array<ArrayBuffer>, encrypted: string] | null {
+    const version2Header = text.indexOf('\u{1F3B6}3/4|')
+    const version1Header = text.indexOf('\u{1F3B6}2/4|')
+    if (version2Header === -1 && version1Header === -1) return null
+    const untilEnd = text.slice(version2Header !== -1 ? version2Header : version1Header).split(':||')
+    if (untilEnd.length === 0) return null
+    if (version1Header !== -1) return [undefined, untilEnd[0].slice('\u{1F3B6}2/4|'.length)]
+    const fields = untilEnd[0].split('|')
+    if (fields.length !== 3) return null
+    return [new Uint8Array(decodeArrayBuffer(fields[1])), fields[2]]
 }