path: root/JMAP_COMPLIANCE.md

# JMAP Compliance Assessment

**Date:** August 15, 2025  
**JMAP Specification:** RFC 8620  
**JCHAT Extension:** Custom capability `urn:ietf:params:jmap:chat`

## Executive Summary

Our JCHAT implementation has **good foundational JMAP compliance** with some areas needing attention for full RFC 8620 conformance. The core protocol structure is solid, but we're missing several required features and have some implementation gaps.

## Compliance Status Overview

### ✅ COMPLIANT Areas

#### 1. Session Resource (RFC 8620 Section 2)
- **Endpoint:** `GET /jmap/session` ✅
- **Response Structure:** Fully compliant ✅
- **Required Properties:** All present ✅
  - `capabilities` - Properly structured
  - `accounts` - Correctly formatted  
  - `primaryAccounts` - Present
  - `username` - Included
  - `apiUrl` - Valid endpoint
  - `downloadUrl` - Template format correct
  - `uploadUrl` - Template format correct 
  - `eventSourceUrl` - Present (though not fully implemented)
  - `state` - Session state tracking

#### 2. Core JMAP Request/Response Structure
- **Content-Type:** `application/json` ✅
- **Request Object Structure:** Compliant ✅
  - `using` array for capabilities
  - `methodCalls` array with [method, args, callId] format
  - `createdIds` object support
- **Response Object Structure:** Compliant ✅
  - `methodResponses` array
  - `createdIds` object
  - `sessionState` included

#### 3. Error Handling (RFC 8620 Section 3.6)
- **Error URNs:** Proper JMAP error namespace ✅
  - `urn:ietf:params:jmap:error:notJSON`
  - `urn:ietf:params:jmap:error:notRequest`
  - `urn:ietf:params:jmap:error:unknownCapability`
- **Error Response Format:** Compliant ✅
- **HTTP Status Codes:** Appropriate usage ✅

#### 4. Method Implementation Pattern
- **Standard Methods:** Following JMAP conventions ✅
  - `/get`, `/set`, `/changes`, `/query` patterns
  - Proper method naming: `ObjectType/method`
- **Core/echo:** Implemented ✅

#### 5. Capability Declaration
- **Core Capability:** `urn:ietf:params:jmap:core` ✅
- **Extension Capability:** `urn:ietf:params:jmap:chat` ✅
- **Capability Validation:** Proper checking ✅

#### 6. CORS Support
- **Headers:** Properly configured ✅
- **Preflight:** OPTIONS handling ✅
- **Origin:** Wildcard for development ✅

---

### ⚠️ PARTIALLY COMPLIANT Areas

#### 1. Authentication & Authorization (RFC 8620 Section 3.9)
**Status:** Major Gap ❌
```
Current: No authentication - hardcoded AccountId = "default"
Required: Proper authentication mechanism
```
**Issues:**
- No user authentication
- No session validation
- No authorization checks
- Hardcoded account ID

**Fix Required:**
```erlang
% Need to implement proper auth
authenticate_request(Req) ->
    case get_auth_header(Req) of
        {ok, Token} -> validate_token(Token);
        {error, missing} -> {error, unauthorized}
    end.
```

#### 2. State Management (RFC 8620 Section 1.6)
**Status:** Basic Implementation ⚠️
```
Current: Simple state counter, not per-account
Required: Proper state tracking per account/object type
```
**Issues:**
- Global state counter vs per-account
- State not properly updated on all changes
- No state validation in requests

#### 3. Object Property Filtering
**Status:** Partially Implemented ⚠️
```
Current: Basic property support in /get methods
Missing: Full property filtering, null handling
```

#### 4. Pagination & Limits (RFC 8620 Section 5.5)
**Status:** Missing ❌
```
Current: No pagination in /query methods
Required: position, limit, anchor support
```

---

### ❌ NON-COMPLIANT Areas

#### 1. Binary Data Support (RFC 8620 Section 6)
**Status:** Not Implemented ❌
- Upload endpoint defined but not implemented
- Download endpoint defined but not implemented
- No blob storage mechanism
- No binary data handling in objects

**Required Implementation:**
```erlang
% Upload endpoint
handle_upload(Req, AccountId) ->
    {ok, Body, _} = cowboy_req:read_body(Req),
    BlobId = generate_blob_id(),
    store_blob(AccountId, BlobId, Body),
    Response = #{
        <<"accountId">> => AccountId,
        <<"blobId">> => BlobId,
        <<"type">> => get_content_type(Req),
        <<"size">> => byte_size(Body)
    },
    reply_json(201, Response, Req).
```

#### 2. Server-Sent Events (RFC 8620 Section 7)
**Status:** Endpoint exists, not implemented ❌
```erlang
% EventSource endpoint defined but returns empty
% Need proper SSE implementation for real-time updates
```

#### 3. Push Notifications
**Status:** Not Implemented ❌
- No push subscription mechanism
- No WebPush support
- No push state validation

#### 4. Concurrency Control
**Status:** Missing ❌
- No ifInState validation
- No optimistic locking
- No conflict detection

---

## Method-Level Compliance Analysis

### Core Methods

#### Core/echo ✅
```json
Request: ["Core/echo", {"hello": "world"}, "c1"]
Response: ["Core/echo", {"hello": "world"}, "c1"]
```
**Status:** Fully compliant

### Conversation Methods

#### Conversation/get ⚠️
**Compliant:**
- Basic structure correct
- Property filtering works
- Error handling proper

**Issues:**
- No `notFound` handling for missing IDs
- Properties parameter not fully validated
- No account validation

#### Conversation/set ⚠️
**Compliant:**
- Create/update structure
- Response format correct
- Error reporting

**Issues:**
- No `ifInState` validation
- No proper conflict detection
- Limited validation of input data

#### Conversation/query ⚠️
**Compliant:**
- Basic query structure
- Filter support

**Issues:**
- No pagination (position, limit, anchor)
- No sort/collation support
- Missing query validation

#### Conversation/changes ⚠️
**Compliant:**
- Basic structure

**Issues:**
- State tracking incomplete
- No proper change detection
- No `hasMoreChanges` logic

### Message Methods
Similar compliance status as Conversation methods - basic structure correct but missing advanced features.

---

## Detailed Compliance Gaps

### 1. RFC 8620 Section 3.3 - Request Object Validation

**Missing Validations:**
```erlang
validate_request(Request) ->
    % Need to validate:
    % - using array contains supported capabilities
    % - methodCalls is array of valid invocations  
    % - createdIds is object with string values
    % - no unknown properties
    ok.
```

### 2. RFC 8620 Section 3.4 - Response Object

**Current Issues:**
```
✅ methodResponses array format
✅ createdIds object  
❌ sessionState not properly managed
❌ Missing response validation
```

### 3. RFC 8620 Section 5.1 - /get Method

**Missing Features:**
```erlang
% Properties validation
validate_properties(Properties, ObjectType) -> ok | {error, Reason}.

% NotFound handling  
{ok, #{
    <<"accountId">> => AccountId,
    <<"state">> => State,
    <<"list">> => FoundObjects,
    <<"notFound">> => MissingIds  % ← Missing
}}.
```

### 4. RFC 8620 Section 5.3 - /set Method

**Missing Features:**
```erlang
% IfInState validation
validate_if_in_state(Args, CurrentState) -> ok | {error, stateMismatch}.

% Proper conflict detection
detect_conflicts(OldState, NewState) -> [ConflictId].

% Destroy dependencies 
check_destroy_dependencies(Id) -> ok | {error, Reason}.
```

### 5. RFC 8620 Section 5.5 - /query Method

**Missing Features:**
```erlang
% Pagination support
handle_pagination(#{
    <<"position">> => Position,
    <<"limit">> => Limit,
    <<"anchor">> => Anchor
}) -> {Start, End}.

% Sorting support  
apply_sort(Results, Sort) -> SortedResults.
```

---

## Priority Fixes for Full Compliance

### Phase 1: Critical (Required for basic compliance)

1. **Authentication Implementation**
   ```erlang
   % Add proper auth to jchat_http.erl
   authenticate_request(Req) ->
       case cowboy_req:header(<<"authorization">>, Req) of
           undefined -> {error, unauthorized};
           <<"Bearer ", Token/binary>> -> validate_jwt(Token);
           _ -> {error, malformed_auth}
       end.
   ```

2. **State Management Fix**
   ```erlang
   % Per-account state tracking in jchat_db.erl
   get_account_state(AccountId, ObjectType) -> State.
   update_account_state(AccountId, ObjectType) -> NewState.
   ```

3. **Binary Data Implementation**
   - Implement upload/download endpoints
   - Add blob storage to Mnesia
   - Support attachments in messages

### Phase 2: Standard Methods (For method compliance)

1. **Enhance /get methods**
   ```erlang
   % Add notFound handling
   handle_object_get(Args, AccountId) ->
       {Found, NotFound} = find_objects(Ids),
       #{<<"list">> => Found, <<"notFound">> => NotFound}.
   ```

2. **Fix /set methods**
   ```erlang
   % Add ifInState validation
   validate_if_in_state(Args, CurrentState) ->
       case maps:get(<<"ifInState">>, Args, CurrentState) of
           CurrentState -> ok;
           _ -> {error, stateMismatch}
       end.
   ```

3. **Implement /query pagination**
   ```erlang
   % Add pagination to queries
   apply_pagination(Results, Position, Limit, Anchor) ->
       {PaginatedResults, QueryState}.
   ```

### Phase 3: Advanced Features (For full compliance)

1. **Server-Sent Events**
2. **Push Notifications** 
3. **Advanced Query Features**
4. **Concurrency Control**

---

## Testing JMAP Compliance

### Manual Testing Commands

```bash
# Test session endpoint
curl -X GET http://localhost:8080/jmap/session

# Test basic request
curl -X POST http://localhost:8080/jmap/api \
  -H "Content-Type: application/json" \
  -d '{
    "using": ["urn:ietf:params:jmap:core", "urn:ietf:params:jmap:chat"],
    "methodCalls": [["Core/echo", {"test": "data"}, "c1"]]
  }'

# Test conversation query
curl -X POST http://localhost:8080/jmap/api \
  -H "Content-Type: application/json" \
  -d '{
    "using": ["urn:ietf:params:jmap:chat"],
    "methodCalls": [["Conversation/query", {"accountId": "default"}, "c1"]]
  }'
```

### Automated Compliance Testing

```erlang
%% Add to jchat_SUITE.erl
test_jmap_session_compliance() ->
    {ok, {{_, 200, _}, Headers, Body}} = 
        httpc:request(get, {"http://localhost:8080/jmap/session", []}, [], []),
    
    %% Validate Content-Type
    ?assertMatch({"content-type", "application/json" ++ _}, 
                 lists:keyfind("content-type", 1, Headers)),
    
    %% Validate required session properties  
    Session = jsx:decode(list_to_binary(Body), [return_maps]),
    ?assertMatch(#{<<"capabilities">> := _}, Session),
    ?assertMatch(#{<<"accounts">> := _}, Session),
    ?assertMatch(#{<<"primaryAccounts">> := _}, Session),
    ?assertMatch(#{<<"apiUrl">> := _}, Session).

test_jmap_request_response_compliance() ->
    Request = #{
        <<"using">> => [<<"urn:ietf:params:jmap:core">>],
        <<"methodCalls">> => [[<<"Core/echo">>, #{<<"test">> => <<"data">>}, <<"c1">>]]
    },
    
    {ok, Response} = make_jmap_request(Request),
    
    %% Validate response structure
    ?assertMatch(#{<<"methodResponses">> := _}, Response),
    ?assertMatch(#{<<"sessionState">> := _}, Response).
```

---

## Recommendations

### Immediate Actions (Week 1)
1. ✅ Document current compliance status (this document)
2. 🔧 Fix authentication mechanism
3. 🔧 Implement proper state management
4. 🔧 Add binary data support

### Short Term (Weeks 2-4)
1. 🔧 Enhance all standard methods (/get, /set, /query, /changes)
2. 🔧 Add comprehensive input validation
3. 🔧 Implement proper error handling
4. 🔧 Add pagination support

### Long Term (Weeks 5-8)
1. 🔧 Server-Sent Events implementation
2. 🔧 Push notification support  
3. 🔧 Advanced query features
4. 🔧 Full concurrency control

### Compliance Testing
1. 🧪 Create comprehensive test suite
2. 🧪 Automated compliance checking
3. 🧪 Performance benchmarking
4. 🧪 Interoperability testing

---

## Conclusion

Our JCHAT implementation demonstrates **solid understanding of JMAP principles** and has a **good foundation** for a compliant server. The session handling, basic request/response structure, and method patterns are all correct.

**Key Strengths:**
- Proper JMAP request/response structure
- Correct error handling patterns
- Good capability system
- Clean method organization

**Critical Gaps:**
- No authentication/authorization
- Incomplete state management  
- Missing binary data support
- Limited method feature completeness

With focused development effort on the priority fixes, we can achieve **full JMAP compliance within 4-6 weeks** while maintaining our clean architectural foundation.