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Restructurize Basic Chat document, describe history sync

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CPEs/proposed/CPE4 - Basic chats.md
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# CPE#4 - Basic chats # CPE#4 - Basic chats
## 0. Table of content
- [CPE#4 - Basic chats](#cpe4---basic-chats)
- [0. Table of content](#0-table-of-content)
- [1. Introduction](#1-introduction)
- [2. Requirements](#2-requirements)
- [3. Message type identifiers](#3-message-type-identifiers)
- [4. Errors](#4-errors)
- [4.1. Error types](#41-error-types)
- [5. Event types](#5-event-types)
- [5.1. Media types](#51-media-types)
- [6. Use cases](#6-use-cases)
- [6.1. Exchanging messages](#61-exchanging-messages)
- [6.2. Exchanging media](#62-exchanging-media)
- [6.3. Read messages](#63-read-messages)
- [6.4. Typing message](#64-typing-message)
- [6.5. Message history API](#65-message-history-api)
- [6.5.1. History retrieving](#651-history-retrieving)
- [7. Business Rules](#7-business-rules)
- [7.1. Typing message notification](#71-typing-message-notification)
- [7.2. Message/Media ID](#72-messagemedia-id)
- [8. JSON Schema](#8-json-schema)
- [Event Entity](#event-entity)
- [Content sections](#content-sections)
- [Send message (`urn:cadmium:chat:message`)](#send-message-urncadmiumchatmessage)
- [Request](#request)
- [Response](#response)
- [Read message notification (`urn:cadmium:chat:read`)](#read-message-notification-urncadmiumchatread)
- [Request](#request-1)
- [Edit message notification (`urn:cadmium:chat:message:edit`)](#edit-message-notification-urncadmiumchatmessageedit)
- [Request](#request-2)
- [Delete message notification (`urn:cadmium:chat:message:delete`)](#delete-message-notification-urncadmiumchatmessagedelete)
- [Request](#request-3)
- [Sync history of user chats (`urn:cadmium:chat:history:sync`)](#sync-history-of-user-chats-urncadmiumchathistorysync)
- [Request](#request-4)
- [Response](#response-1)
## 1. Introduction ## 1. Introduction
This extension is intended for organizing chats between some entities. This extension is intended for organizing chats between some entities.
@ -16,9 +53,12 @@ This extension is intended for organizing chats between some entities.
## 3. Message type identifiers ## 3. Message type identifiers
- `urn:cadmium:chats:message` - regular message - `urn:cadmium:chat:message` - regular message
- `urn:cadmium:chats:read` - read message system - `urn:cadmium:chat:read` - read message notification
- `urn:cadmium:chats:typing` - typing message system - `urn:cadmium:chat:typing` - typing message notification
- `urn:cadmium:chat:message:edit` - edit message notification
- `urn:cadmium:chat:message:delete` - delete message notification
- `urn:cadmium:chat:history:sync` - sync history of user chats
## 4. Errors ## 4. Errors
@ -27,35 +67,34 @@ This extension is intended for organizing chats between some entities.
### 4.1. Error types ### 4.1. Error types
- `urn:cadmium:chats:private:banned` - Sending messages to user is prohibited, because he banned the sender of current message - in case if we send the message to user entity. - `urn:cadmium:chat:private:banned` - Sending messages to user is prohibited, because he banned the sender of current message - in case if we send the message to user entity.
## 5. Chat message types ## 5. Event types
- `urn:cadmium:chats:message:types:general` - message with text and optional media - `urn:cadmium:chat:event:message` - message with text and optional media
- `urn:cadmium:chats:message:types:geolocation` - message with geolocation (coordinates)
### 5.1. Media types ### 5.1. Media types
- `urn:cadmium:chats:media:photo` - a photo - `urn:cadmium:chat:media:photo` - a photo
- `urn:cadmium:chats:media:audio` - an audio or voice message - `urn:cadmium:chat:media:audio` - an audio or voice message
- `urn:cadmium:chats:media:video` - a video or rounded video message - `urn:cadmium:chat:media:video` - a video or rounded video message
- `urn:cadmium:chats:media:file` - any other file type - `urn:cadmium:chat:media:file` - any other file type
- `urn:cadmium:chats:media:sticker` - a sticker - `urn:cadmium:chat:media:sticker` - a sticker
- `urn:cadmium:chats:media:gif` - an animated GIF - `urn:cadmium:chat:media:gif` - an animated GIF
## 6. Use cases ## 6. Use cases
### 6.1. Exchanging messages ### 6.1. Exchanging messages
1. Sending message: 1. C1->S - Sending message:
```json ```json
{ {
"id": "abcd", "id": "abcd",
"type": "urn:cadmium:chats:message", "type": "urn:cadmium:chat:message",
"to": ["@user2@cadmium.org"], "to": ["@user2@cadmium.org"],
"payload": { "payload": {
"type": "urn:cadmium:chats:message:types:general", "type": "urn:cadmium:chat:event:message",
"content": { "content": {
"text": "hello world", "text": "hello world",
} }
@ -63,48 +102,48 @@ This extension is intended for organizing chats between some entities.
} }
``` ```
**Successful response**: S->C1 - Successful response:
```json ```json
{ {
"id": "abcd", "id": "abcd",
"type": "urn:cadmium:chats:message", "type": "urn:cadmium:chat:message",
"from": "cadmium.org", "from": "cadmium.org",
"ok": true, "ok": true,
"payload": { "payload": {
"messageID": "3b5135a5-aff5-4396-a629-a254f383e82f", "eventID": "3b5135a5-aff5-4396-a629-a254f383e82f",
"originServerTimestamp": 1599327584 "originServerTimestamp": 1599327584
} }
} }
``` ```
**Error response**: S->C1 - **Error** response:
```json ```json
{ {
"id": "abcd", "id": "abcd",
"type": "urn:cadmium:chats:message", "type": "urn:cadmium:chat:message",
"from": "cadmium.org", "from": "cadmium.org",
"ok": false, "ok": false,
"payload": { "payload": {
"errID": "urn:cadmium:chats:private:banned", "errID": "urn:cadmium:chat:private:banned",
"errText": "The user banned you" "errText": "The user has banned you"
} }
} }
``` ```
2. Receiving message on other side: 2. S->C2:
```json ```json
{ {
"id": "abcd", "id": "abcd",
"type": "urn:cadmium:chats:message", "type": "urn:cadmium:chat:message",
"from": "@user1@cadmium.im", "from": "@user1@cadmium.im",
"ok": true, "ok": true,
"payload": { "payload": {
"messageID": "3b5135a5-aff5-4396-a629-a254f383e82f", "eventID": "3b5135a5-aff5-4396-a629-a254f383e82f",
"originServerTimestamp": 1599327584, "originServerTimestamp": 1599327584,
"type": "urn:cadmium:chats:message:types:general", "type": "urn:cadmium:chat:event:message",
"content": { "content": {
"text": "hello world", "text": "hello world",
} }
@ -117,13 +156,14 @@ This extension is intended for organizing chats between some entities.
1. Upload the media to Content Service (explanation out of scope of this document) 1. Upload the media to Content Service (explanation out of scope of this document)
2. Send message containing the metadata of uploaded media: 2. Send message containing the metadata of uploaded media:
C1->S:
```json ```json
{ {
"id": "abcd", "id": "abcd",
"type": "urn:cadmium:chats:message", "type": "urn:cadmium:chat:message",
"to": ["@user2@cadmium.im"], "to": ["@user2@cadmium.im"],
"payload": { "payload": {
"type": "urn:cadmium:chats:message-types:general", "type": "urn:cadmium:chat:event:message",
"content": { "content": {
"text": "", "text": "",
"media": [ "media": [
@ -137,12 +177,11 @@ This extension is intended for organizing chats between some entities.
} }
``` ```
**Response**: S->C1:
```json ```json
{ {
"id": "abcd", "id": "abcd",
"type": "urn:cadmium:chats:message", "type": "urn:cadmium:chat:message",
"from": "cadmium.im", "from": "cadmium.im",
"ok": true, "ok": true,
"payload": { "payload": {
@ -156,22 +195,24 @@ This extension is intended for organizing chats between some entities.
3. Receive message with media on other side: 3. Receive message with media on other side:
S->C2:
```json ```json
{ {
"id": "defg", "id": "defg",
"type": "urn:cadmium:chats:message", "type": "urn:cadmium:chat:message",
"from": "@user1@cadmium.im", "from": "@user1@cadmium.im",
"ok": true, "ok": true,
"payload": { "payload": {
"messageID": "7a1b9a72-1677-4476-9b22-ef7fdbcff52e", "messageID": "7a1b9a72-1677-4476-9b22-ef7fdbcff52e",
"originServerTimestamp": 1599329232, "originServerTimestamp": 1599329232,
"type": "urn:cadmium:chats:message:types:general", "type": "urn:cadmium:chat:event:message",
"content": { "content": {
"text": "", "text": "",
"media": [ "media": [
{ {
"id": "4a771ac1-f0b2-4a4a-9700-f2a26fa2bb67@content.cadmium.im", "id": "4a771ac1-f0b2-4a4a-9700-f2a26fa2bb67@content.cadmium.im",
"type": "urn:cadmium:chats:media:photo", "type": "urn:cadmium:chat:media:photo",
"attrs": { "attrs": {
"width": 512, "width": 512,
"height": 512 "height": 512
@ -191,7 +232,7 @@ This extension is intended for organizing chats between some entities.
```json ```json
{ {
"id": "abcd", "id": "abcd",
"type": "urn:cadmium:chats:read", "type": "urn:cadmium:chat:read",
"to": ["@user1@cadmium.org"], "to": ["@user1@cadmium.org"],
"payload": { "payload": {
"messageID": "7a1b9a72-1677-4476-9b22-ef7fdbcff52e", "messageID": "7a1b9a72-1677-4476-9b22-ef7fdbcff52e",
@ -204,7 +245,7 @@ This extension is intended for organizing chats between some entities.
```json ```json
{ {
"id": "abcd", "id": "abcd",
"type": "urn:cadmium:chats:read", "type": "urn:cadmium:chat:read",
"from": "cadmium.im", "from": "cadmium.im",
"ok": true, "ok": true,
"payload": {} "payload": {}
@ -216,7 +257,7 @@ This extension is intended for organizing chats between some entities.
```json ```json
{ {
"id": "defg", "id": "defg",
"type": "urn:cadmium:chats:read", "type": "urn:cadmium:chat:read",
"from": "@user2@cadmium.im", "from": "@user2@cadmium.im",
"ok": true, "ok": true,
"payload": { "payload": {
@ -232,9 +273,8 @@ This extension is intended for organizing chats between some entities.
```json ```json
{ {
"id": "abcd", "id": "abcd",
"type": "urn:cadmium:chats:typing", "type": "urn:cadmium:chat:typing",
"to": ["@user1@cadmium.org"], "to": ["@user1@cadmium.org"],
"payload": {}
} }
``` ```
@ -243,12 +283,19 @@ This extension is intended for organizing chats between some entities.
```json ```json
{ {
"id": "defg", "id": "defg",
"type": "urn:cadmium:chats:typing", "type": "urn:cadmium:chat:typing",
"from": "@user2@cadmium.im", "from": "@user2@cadmium.im",
"ok": true, "ok": true
"payload": {}
} }
``` ```
### 6.5. Message history API
#### 6.5.1. History retrieving
## 7. Business Rules ## 7. Business Rules
@ -262,39 +309,30 @@ This extension is intended for organizing chats between some entities.
## 8. JSON Schema ## 8. JSON Schema
### Message (`urn:cadmium:chats:message`) ### Event Entity
**Request**:
```typescript ```typescript
interface MessagePayload { interface Event {
messageID?: EntityID; // the message id (stored in chat timeline) - not required when sending id: EntityID; // the message id (stored in chat timeline) - not required when sending
type: string; // the type of message type: string; // the type of event
replyTo?: EntityID; // message id to which this message is replying originServerTimestamp: number; // unix timestamp of received message on the origin server (not required when sending)
originServerTimestamp?: number; // unix timestamp of received message on the origin server (not required when sending) content: Content; // the payload of message (depends on type)
forwardedFrom?: EntityID | string; // entity from which this message was forwarded (may be hidden, so instead client need to show the display name of entity)
content: Content // the payload of message (depends on type)
} }
```
**Response**: interface Content {}
```typescript
interface SendMessageResponsePayload {
messageID: EntityID; // the message id (stored in chat timeline)
originServerTimestamp: number; // unix timestamp of sent message on the origin server
}
``` ```
#### Content sections #### Content sections
- `urn:cadmium:chats:message:types:general`: - `urn:cadmium:chat:events:types:message`:
```typescript ```typescript
interface GeneralMessageContent { interface MessageContent : Content {
text: string; // the text (body) of message text: string; // the text (body) of message
mentioned?: boolean; // is current entity was mentioned in this message mentioned?: boolean; // is current entity was mentioned in this message
media?: Media[]; // media content media?: Media[]; // media content
forwardedFrom?: EntityID | string; // entity from which this message was forwarded (may be hidden, so instead client need to show the display name of entity)
replyTo?: EntityID; // message id to which this message is replying
} }
interface Media { interface Media {
@ -338,21 +376,101 @@ interface SendMessageResponsePayload {
width: number; // width of photo width: number; // width of photo
height: number; // height of photo height: number; // height of photo
} }
```
- `urn:cadmium:chats:message:types:geolocation`: interface GeolocationAttrs : MediaAttrs {
lat: number; // the GPS latitude
```typescript
interface GeolocationMessageContent {
lat: number; // the GPS latitude
lon: number; // the GPS longitude lon: number; // the GPS longitude
} }
``` ```
### Read message notification (`urn:cadmium:chats:read`)
### Send message (`urn:cadmium:chat:message`)
#### Request
```typescript ```typescript
interface ReadMessageNotifPayload { interface SendMessageReq {
messageID: EntityID; // the message id of read message type: string;
content: Content;
}
```
#### Response
```typescript
interface SendMessageResponsePayload {
id: EntityID; // the message id (stored in chat timeline)
originServerTimestamp: number; // unix timestamp of sent message on the origin server
}
```
### Read message notification (`urn:cadmium:chat:read`)
#### Request
```typescript
interface ReadMessageNotif {
eventID: EntityID; // the read message id
}
```
### Edit message notification (`urn:cadmium:chat:message:edit`)
#### Request
```typescript
interface EditMessageNotif {
eventID: EntityID; // edited message id
updatedContent: Content; // new content of message
}
```
### Delete message notification (`urn:cadmium:chat:message:delete`)
#### Request
```typescript
interface DeleteMessageNotif {
eventID: EntityID; // deleted message id
}
```
### Sync history of user chats (`urn:cadmium:chat:history:sync`)
#### Request
```typescript
interface ChatsHistorySyncReq {
since: EntityID; // event from which need to sync the history
limit: number; // count of events which need to return
includeChatInfo: boolean; // include chat/user info mentioned in events into response
chatID?: EntityID; // get history of specific chat
direction?: SyncDirection; // in case of getting history of specific chat
}
enum SyncDirection {
Up = "UP", // previous events from 'since' event
Down = "DOWN" // next events from 'since' event
}
```
#### Response
```typescript
interface ChatsHistorySyncResp {
nextBatch: EntityID; // next 'since' value for client
events: Event[]; // synced events
chats?: Chat[]; // chats mentioned in events
users?: User[]; // users mentioned in events
}
interface Event {
eventID: EntityID; // event id in timeline
from: EntityID; // event author
chatID: EntityID; // related chat id
type: string; // type of event
timestamp: number; // origin timestamp of event
originServer: EntityID; // origin server author of event
content: Content; // content of event
} }
``` ```