Сделать DM body opaque для сервера и улучшить fallback UI

shine-UI/js/services/auth-service.js

@@ -239,6 +239,9 @@ const DM_MAX_ENCRYPTED_BODY_BYTES = 16384;
 const DM_CRYPTO_METHOD_X25519_HKDF_AES_GCM = 1;
 const DM_CRYPTO_VERSION_1_0 = 0;
 const DM_HKDF_INFO = utf8Bytes('SHiNE_DM|1|0|X25519+HKDF-SHA256+AES-256-GCM');
+const DM_DECRYPT_ERROR_UNSUPPORTED_FORMAT = 'unsupported_format';
+const DM_DECRYPT_ERROR_DECRYPT_FAILED = 'decrypt_failed';
+const DM_DECRYPT_ERROR_CORRUPTED = 'corrupted';
 
 function ensureAsciiBytes(value, field, min = 1, max = 60) {
   const text = String(value || '').trim();
@@ -330,6 +333,14 @@ function parseEncryptedDmBodyBytes(payloadBytes) {
   };
 }
 
+function classifyDmDecryptFailure(error) {
+  const code = String(error?.message || '').trim();
+  if (code === 'BAD_ENCRYPTED_BODY') return DM_DECRYPT_ERROR_CORRUPTED;
+  if (code === 'Неподдерживаемый метод шифрования DM') return DM_DECRYPT_ERROR_UNSUPPORTED_FORMAT;
+  if (code === 'OperationError') return DM_DECRYPT_ERROR_DECRYPT_FAILED;
+  return DM_DECRYPT_ERROR_DECRYPT_FAILED;
+}
+
 function parseReadReceiptBodyBytes(payloadBytes) {
   if (!(payloadBytes instanceof Uint8Array)) throw new Error('BAD_RECEIPT_PAYLOAD_LEN');
   let o = 0;
@@ -435,7 +446,6 @@ function parseSignedMessageBlockBytes(bytes) {
   let readReceiptPayload = null;
   if (messageType === DM_TYPE_INCOMING || messageType === DM_TYPE_OUTGOING_COPY) {
     if (bodyBytes.length === 0) throw new Error('BAD_MESSAGE_LEN');
-    encryptedBodyPayload = parseEncryptedDmBodyBytes(bodyBytes);
   } else if (messageType === DM_TYPE_READ_INCOMING || messageType === DM_TYPE_READ_OUTGOING_COPY) {
     if (bodyBytes.length === 0) throw new Error('BAD_RECEIPT_PAYLOAD_LEN');
     if (revisionTimeMs !== 0 || reencryptedAtMs !== 0) throw new Error('BAD_RECEIPT_REVISION');
@@ -2334,6 +2344,10 @@ export class AuthService {
     return parseReadReceiptBodyBytes(payloadBytes);
   }
 
+  classifyDmDecryptFailure(error) {
+    return classifyDmDecryptFailure(error);
+  }
+
   async decryptSignedMessageContent({ parsed, blobB64 = '', login, storagePwd }) {
     const parsedBlock = parsed || this.parseSignedMessageBlob(blobB64);
     const messageType = Number(parsedBlock?.messageType || 0);