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+# JMAP Standards Compliance Improvements
+
+**Date:** August 15, 2025  
+**Based on:** JMAP Crash Course and RFC 8620
+
+## Summary of Improvements Made
+
+After reviewing the JMAP crash course, I've implemented several key improvements to make our JCHAT server more standards-compliant with RFC 8620.
+
+## Core Improvements
+
+### 1. Enhanced Request/Response Structure Validation
+
+**Previous:**
+- Basic validation of `using` and `methodCalls`
+- Limited error handling
+
+**Improved:**
+```erlang
+% Now validates complete JMAP request structure
+validate_jmap_request(#{<<"using">> := Using, <<"methodCalls">> := MethodCalls}) ->
+    case validate_using_array(Using) of
+        ok -> validate_method_calls_array(MethodCalls);
+        Error -> Error
+    end.
+
+% Ensures method call IDs are unique within request
+validate_unique_call_ids(MethodCalls) ->
+    CallIds = [CallId || [_, _, CallId] <- MethodCalls],
+    case length(CallIds) =:= length(lists:usort(CallIds)) of
+        true -> ok;
+        false -> {error, "Method call IDs must be unique"}
+    end.
+```
+
+### 2. Proper Content-Type Handling
+
+**Previous:**
+- Loose content type checking
+
+**Improved:**
+```erlang
+validate_content_type(Req) ->
+    case cowboy_req:header(<<"content-type">>, Req) of
+        <<"application/json", _/binary>> -> ok;
+        _ -> {error, invalid_content_type}
+    end.
+```
+
+**Now returns proper content-type:**
+```
+Content-Type: application/json; charset=utf-8
+```
+
+### 3. Comprehensive Error Response Format
+
+**Previous:**
+- Basic error types
+
+**Improved:**
+- All standard JMAP error types from RFC 8620:
+```erlang
+format_error(invalid_arguments) -> #{type => <<"invalidArguments">>};
+format_error(account_not_found) -> #{type => <<"accountNotFound">>};
+format_error(forbidden) -> #{type => <<"forbidden">>};
+format_error(invalid_result_reference) -> #{type => <<"invalidResultReference">>};
+format_error(anchor_not_found) -> #{type => <<"anchorNotFound">>};
+format_error(unsupported_sort) -> #{type => <<"unsupportedSort">>};
+format_error(unsupported_filter) -> #{type => <<"unsupportedFilter">>};
+format_error(cannot_calculate_changes) -> #{type => <<"cannotCalculateChanges">>};
+format_error(too_large) -> #{type => <<"tooLarge">>};
+format_error(rate_limited) -> #{type => <<"rateLimited">>};
+format_error(state_mismatch) -> #{type => <<"stateMismatch">>};
+% ... and more
+```
+
+### 4. Authentication Framework
+
+**Previous:**
+- Hardcoded account ID
+
+**Improved:**
+```erlang
+% Extract Bearer token from Authorization header
+extract_auth_token(<<"Bearer ", Token/binary>>) -> {ok, Token};
+
+% Session endpoint now handles authentication
+authenticate_session_request(<<"Bearer ", _Token/binary>>) ->
+    {ok, <<"demo@example.com">>}; % In production, validate token
+
+% Account ID determination from auth context
+determine_account_id(_AuthHeader) ->
+    <<"default">>. % In production, extract from validated JWT token
+```
+
+### 5. Method Call Validation
+
+**Added comprehensive method call structure validation:**
+```erlang
+validate_method_call([Method, Args, CallId]) 
+  when is_binary(Method), is_map(Args), is_binary(CallId) ->
+    case validate_method_name(Method) of
+        true -> ok;
+        false -> {error, invalid_method_name}
+    end.
+
+validate_method_name(Method) ->
+    case binary:split(Method, <<"/">>) of
+        [Type, Operation] when byte_size(Type) > 0, byte_size(Operation) > 0 ->
+            validate_method_chars(Method);
+        _ -> false
+    end.
+```
+
+### 6. Session Object Improvements
+
+**Previous:**
+- Static session state
+- Fixed username
+
+**Improved:**
+```erlang
+build_session_object(Username) ->
+    #{
+        <<"capabilities">> => #{...},
+        <<"accounts">> => #{
+            <<"default">> => #{
+                <<"name">> => Username,  % Dynamic username
+                <<"isPersonal">> => true,
+                <<"isReadOnly">> => false,
+                <<"accountCapabilities">> => #{...}
+            }
+        },
+        <<"username">> => Username,
+        <<"state">> => jchat_utils:generate_id() % Unique session state
+    }.
+```
+
+## Standards Compliance Checklist
+
+### ✅ Now Compliant
+
+1. **Request Structure Validation**
+   - ✅ Validates `using` array is non-empty and contains only strings
+   - ✅ Validates `methodCalls` array structure
+   - ✅ Ensures method call IDs are unique within request
+   - ✅ Proper method name format validation (`Type/operation`)
+
+2. **Content-Type Handling**
+   - ✅ Validates `application/json` content type
+   - ✅ Returns `application/json; charset=utf-8` in responses
+
+3. **Error Handling**
+   - ✅ All standard JMAP error types implemented
+   - ✅ Proper error response structure
+   - ✅ URN-based error type identifiers
+
+4. **Session Endpoint**
+   - ✅ Authentication framework in place
+   - ✅ Dynamic session state generation
+   - ✅ Proper CORS handling
+   - ✅ Method validation (GET/OPTIONS only)
+
+5. **HTTP Method Handling**
+   - ✅ Proper OPTIONS preflight support
+   - ✅ Method not allowed responses
+   - ✅ Authorization header extraction
+
+### ⚠️ Still Needs Work
+
+1. **Real Authentication**
+   - Currently returns demo session regardless of auth
+   - Need JWT token validation implementation
+   - Need user lookup from token
+
+2. **Account Management**
+   - Still using hardcoded "default" account
+   - Need proper account ID extraction from auth context
+   - Need multi-account support
+
+3. **State Management**
+   - Session state is generated but not tracked
+   - Need persistent state tracking per account/object type
+   - Need state validation in method calls
+
+4. **Binary Data**
+   - Upload/download endpoints defined but not implemented
+   - Need blob storage system
+   - Need proper multipart handling
+
+## Example: Standards-Compliant Request Flow
+
+### 1. Client Session Request
+```http
+GET /jmap/session HTTP/1.1
+Authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9...
+```
+
+### 2. Server Session Response
+```json
+{
+  "capabilities": {
+    "urn:ietf:params:jmap:core": {
+      "maxSizeUpload": 50000000,
+      "maxConcurrentRequests": 4,
+      "maxCallsInRequest": 16
+    },
+    "urn:ietf:params:jmap:chat": {
+      "maxMessageLength": 10000,
+      "maxParticipantsPerConversation": 100
+    }
+  },
+  "accounts": {
+    "default": {
+      "name": "user@example.com",
+      "isPersonal": true,
+      "isReadOnly": false,
+      "accountCapabilities": {
+        "urn:ietf:params:jmap:core": {},
+        "urn:ietf:params:jmap:chat": {}
+      }
+    }
+  },
+  "primaryAccounts": {
+    "urn:ietf:params:jmap:chat": "default"
+  },
+  "username": "user@example.com",
+  "apiUrl": "http://localhost:8080/jmap/api",
+  "state": "b3e91c7a-8f2d-4c1e-9a5b-7d3e2f1c8b9a"
+}
+```
+
+### 3. Client API Request
+```http
+POST /jmap/api HTTP/1.1
+Content-Type: application/json; charset=utf-8
+Authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9...
+
+{
+  "using": ["urn:ietf:params:jmap:core", "urn:ietf:params:jmap:chat"],
+  "methodCalls": [
+    ["Conversation/query", {"accountId": "default"}, "c1"],
+    ["Message/query", {"accountId": "default", "filter": {"conversationId": "#c1"}}, "c2"]
+  ]
+}
+```
+
+### 4. Server API Response
+```json
+{
+  "methodResponses": [
+    ["Conversation/query", {"accountId": "default", "ids": ["conv1", "conv2"]}, "c1"],
+    ["Message/query", {"accountId": "default", "ids": ["msg1", "msg2", "msg3"]}, "c2"]
+  ],
+  "sessionState": "b3e91c7a-8f2d-4c1e-9a5b-7d3e2f1c8b9a"
+}
+```
+
+## Testing the Improvements
+
+### Manual Testing
+```bash
+# Test session endpoint with proper headers
+curl -X GET http://localhost:8080/jmap/session \
+  -H "Authorization: Bearer test-token"
+
+# Test API endpoint with proper content type
+curl -X POST http://localhost:8080/jmap/api \
+  -H "Content-Type: application/json; charset=utf-8" \
+  -H "Authorization: Bearer test-token" \
+  -d '{
+    "using": ["urn:ietf:params:jmap:core", "urn:ietf:params:jmap:chat"],
+    "methodCalls": [["Core/echo", {"test": "data"}, "c1"]]
+  }'
+
+# Test error handling with invalid content type
+curl -X POST http://localhost:8080/jmap/api \
+  -H "Content-Type: text/plain" \
+  -d '{"invalid": "request"}'
+```
+
+### Expected Error Response
+```json
+{
+  "type": "urn:ietf:params:jmap:error:notJSON",
+  "status": 400,
+  "detail": "Content-Type must be application/json"
+}
+```
+
+## Next Steps for Full Compliance
+
+1. **Implement Real Authentication**
+   - JWT token validation
+   - User database lookup
+   - Session management
+
+2. **Add Binary Data Support**
+   - Upload endpoint implementation
+   - Download endpoint implementation
+   - Blob storage in Mnesia
+
+3. **Enhanced State Management**
+   - Per-account state tracking
+   - State validation in method calls
+   - Proper change detection
+
+4. **Method Enhancements**
+   - Better property filtering
+   - Pagination support
+   - Advanced query features
+
+These improvements move us significantly closer to full JMAP RFC 8620 compliance while maintaining our clean architecture and extensibility.