# 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.