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authorCalvin Morrison <calvin@pobox.com>2025-09-03 21:15:36 -0400
committerCalvin Morrison <calvin@pobox.com>2025-09-03 21:15:36 -0400
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+# 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.