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# 06. Channels Read API
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## Человеко-читаемое объяснение
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Эти функции — это **чтение данных каналов** для UI:
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1. `ListSubscriptionsFeed` — отдает данные для экрана списка каналов:
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- ваши каналы (личный + созданные вами),
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- каналы пользователей, на кого вы подписаны,
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- отдельные каналы, на которые вы подписаны напрямую.
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2. `GetChannelMessages` — отдает полную ленту одного канала (пока без курсоров, загружается сразу целиком),
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включая версии сообщений, лайки и ответы.
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3. `GetMessageThread` — отдает дерево обсуждения вокруг конкретного сообщения:
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предки, фокус-сообщение, потомки.
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4. `GetChannelsCounters` — отдает счетчики разделов каналов для пользователя.
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5. `ListGroupChats200` — отдает список групповых чатов типа `200`.
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6. `GetGroupDialog` — отдает сообщения конкретного группового чата типа `200`.
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> На первом этапе мы **не используем курсоры** (`nextCursor`) и загружаем полные списки.
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---
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## 1) ListSubscriptionsFeed
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### Request
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```json
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{
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"op": "ListSubscriptionsFeed",
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"requestId": "req-1",
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"payload": {
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"login": "Alice",
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"limit": 200
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}
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}
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```
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### Response (success)
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```json
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{
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"op": "ListSubscriptionsFeed",
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"requestId": "req-1",
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"status": 200,
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"ok": true,
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"payload": {
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"login": "Alice",
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"ownedChannels": [
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{
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"channel": {
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"ownerLogin": "Alice",
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"ownerBlockchainName": "alice-001",
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"channelName": "0",
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"personal": true,
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"channelRoot": { "blockNumber": 0, "blockHash": "..." }
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},
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"messagesCount": 120,
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"lastMessage": {
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"messageRef": { "blockNumber": 921, "blockHash": "..." },
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"text": "последняя версия текста",
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"createdAtMs": 1760000000000,
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"authorLogin": "Alice",
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"authorBlockchainName": "alice-001"
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}
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}
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],
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"followedUsersChannels": [
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{
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"channel": {
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"ownerLogin": "Bob",
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"ownerBlockchainName": "bob-001",
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"channelName": "0",
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"personal": true,
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"channelRoot": { "blockNumber": 0, "blockHash": "..." }
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},
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"messagesCount": 540,
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"lastMessage": {
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"messageRef": { "blockNumber": 922, "blockHash": "..." },
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"text": "последняя версия текста",
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"createdAtMs": 1760000100000,
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"authorLogin": "Bob",
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"authorBlockchainName": "bob-001"
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}
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}
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],
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"followedChannels": [
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{
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"channel": {
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"ownerLogin": "Carl",
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"ownerBlockchainName": "carl-001",
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"channelName": "market",
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"personal": false,
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"channelRoot": { "blockNumber": 456, "blockHash": "..." }
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},
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"messagesCount": 90,
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"lastMessage": {
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"messageRef": { "blockNumber": 1002, "blockHash": "..." },
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"text": "актуальный текст",
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"createdAtMs": 1760001000000,
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"authorLogin": "Carl",
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"authorBlockchainName": "carl-001"
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}
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}
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]
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}
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}
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```
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---
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## 2) GetChannelMessages
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### Request
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```json
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{
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"op": "GetChannelMessages",
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"requestId": "req-2",
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"payload": {
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"channel": {
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"ownerBlockchainName": "bob-001",
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"channelRootBlockNumber": 123,
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"channelRootBlockHash": "..."
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},
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"limit": 200,
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"sort": "asc"
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}
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}
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```
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### Response (success)
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```json
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{
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"op": "GetChannelMessages",
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"requestId": "req-2",
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"status": 200,
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"ok": true,
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"payload": {
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"channel": {
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"ownerLogin": "Bob",
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"ownerBlockchainName": "bob-001",
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"channelName": "news",
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"channelRoot": { "blockNumber": 123, "blockHash": "..." }
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},
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"messages": [
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{
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"messageRef": { "blockNumber": 140, "blockHash": "..." },
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"authorLogin": "Bob",
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"authorBlockchainName": "bob-001",
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"createdAtMs": 1760000000000,
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"text": "текущая версия",
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"likesCount": 12,
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"repliesCount": 3,
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"versionsTotal": 4,
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"versions": [
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{ "versionIndex": 1, "blockNumber": 140, "blockHash": "...", "text": "v1", "createdAtMs": 1760000000000 },
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{ "versionIndex": 2, "blockNumber": 155, "blockHash": "...", "text": "v2", "createdAtMs": 1760001000000 },
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{ "versionIndex": 3, "blockNumber": 170, "blockHash": "...", "text": "v3", "createdAtMs": 1760002000000 },
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{ "versionIndex": 4, "blockNumber": 199, "blockHash": "...", "text": "v4", "createdAtMs": 1760003000000 }
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]
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}
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]
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}
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}
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```
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---
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## 3) GetMessageThread
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### Request
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```json
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{
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"op": "GetMessageThread",
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"requestId": "req-3",
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"payload": {
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"message": {
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"blockchainName": "bob-001",
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"blockNumber": 333,
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"blockHash": "..."
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},
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"depthUp": 20,
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"depthDown": 2,
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"limitChildrenPerNode": 50
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}
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}
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```
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### Response (success)
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```json
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{
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"op": "GetMessageThread",
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"requestId": "req-3",
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"status": 200,
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"ok": true,
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"payload": {
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"ancestors": [MessageNode],
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"focus": MessageNode,
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"descendants": [MessageNodeTree]
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}
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}
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```
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### MessageNode (дополнение)
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- `MessageNode` расширяет формат сообщения из `GetChannelMessages` и дополнительно содержит:
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- `channelInfo` — мета-информация о канале (если применимо);
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- `rawBlockB64` — сырой `block_bytes` текущего блока в Base64.
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- Поле `rawBlockB64` присутствует у узлов во всех частях ответа `GetMessageThread`: `focus`, `ancestors[]`, `descendants[]`.
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- В `GetChannelMessages` поле `rawBlockB64` **не добавляется** (лента канала без сырого блока, чтобы не раздувать ответ).
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---
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## 4) GetChannelsCounters
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### Request
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```json
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{
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"op": "GetChannelsCounters",
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"requestId": "req-4",
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"payload": {
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"login": "Alice"
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}
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}
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```
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### Response (success)
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```json
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{
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"op": "GetChannelsCounters",
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"requestId": "req-4",
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"status": 200,
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"ok": true,
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"payload": {
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"login": "Alice",
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"feedCount": 12,
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"dialogs100Count": 3,
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"groupChats200Count": 4,
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"myChannelsCount": 2
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}
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}
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```
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---
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## 5) ListGroupChats200
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### Request
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```json
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{
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"op": "ListGroupChats200",
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"requestId": "req-5",
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"payload": {
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"login": "Alice"
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}
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}
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```
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### Response (success)
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```json
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{
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"op": "ListGroupChats200",
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"requestId": "req-5",
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"status": 200,
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"ok": true,
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"payload": {
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"login": "Alice",
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"chats": [
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{
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"ownerLogin": "Alice",
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"ownerBlockchainName": "alice-001",
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"channelRootBlockNumber": 123,
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"channelRootBlockHash": "...",
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"channelName": "team",
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"chatTitle": "Team chat",
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"membersCount": 3,
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"updatedAtMs": 1760000000000
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}
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]
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}
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}
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```
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---
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## 6) GetGroupDialog
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### Request
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```json
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{
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"op": "GetGroupDialog",
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"requestId": "req-6",
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"payload": {
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"login": "Alice",
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"group": {
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"ownerBlockchainName": "alice-001",
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"channelRootBlockNumber": 123
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}
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}
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}
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```
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### Response (success)
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```json
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{
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"op": "GetGroupDialog",
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"requestId": "req-6",
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"status": 200,
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"ok": true,
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"payload": {
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"group": {
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"ownerLogin": "Alice",
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"ownerBlockchainName": "alice-001",
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"channelRootBlockNumber": 123,
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"channelName": "team",
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"chatTitle": "Team chat"
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},
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"messages": [
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{
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"authorLogin": "Bob",
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"authorBlockchainName": "bob-001",
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"blockNumber": 140,
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"blockHash": "...",
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"createdAtMs": 1760000000000,
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"text": "Привет"
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}
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]
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}
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}
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```
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---
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## Reason codes
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- `bad_fields`
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- `user_not_found`
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- `channel_not_found`
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- `message_not_found`
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- `limit_too_large`
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- `channel_name_already_exists`
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- `internal_error`
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