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Discovery Specification Compliance Assessment

OpenID Connect Discovery 1.0 Compliance Analysis

Last Updated: September 22, 2025
Compliance Status: ✅ FULLY COMPLIANT

✅ Compliant Features

  1. Core Endpoints Support:
  2. issuer parameter is properly supported and validated
  3. jwks_uri parameter is properly supported and URL-validated
  4. authorization_endpoint parameter is properly supported and URL-validated

  5. token_endpoint parameter is properly supported and URL-validated

  6. Required Metadata Parameters (Section 3 Compliance):

  7. ✅ issuer parameter validation enforced (required per Section 3)
  8. ✅ response_types_supported parameter validation enforced (required per Section 3)
  9. ✅ subject_types_supported parameter validation enforced (required per Section 3)

  10. ✅ id_token_signing_alg_values_supported parameter validation enforced (required per Section 3)

  11. Issuer Validation (Section 3 Compliance):

  12. ✅ HTTPS scheme requirement enforced
  13. ✅ Query and fragment component validation (must not contain)

  14. ✅ Valid URL structure validation with host verification

  15. Parameter Value Validation:

  16. ✅ subject_types_supported values validated against specification ("public", "pairwise")
  17. ✅ response_types_supported values validated against OpenID Connect specification

  18. ✅ Response type component validation for custom combinations

  19. URL Validation:

  20. ✅ All endpoint URLs validated as proper HTTP/HTTPS URLs
  21. ✅ Absolute URL structure validation with host verification

  22. ✅ Development-friendly (allows HTTP for localhost)

  23. Optional Metadata Parameters:

  24. Comprehensive support for optional endpoints (userinfo_endpoint, registration_endpoint)
  25. Algorithm support parameters (id_token_encryption_alg_values_supported, etc.)
  26. Token endpoint authentication parameters
  27. Display and UI parameters (display_values_supported, ui_locales_supported)
  28. Feature support flags (claims_parameter_supported, request_parameter_supported)

  29. Documentation parameters (service_documentation, op_policy_uri, op_tos_uri)

  30. HTTP Response Handling:

  31. ✅ Proper JSON content-type validation
  32. ✅ HTTP status code error handling
  33. ✅ Structured error response with detailed error messages

  34. ✅ Network error handling with timeout support (30s)

  35. Error Handling:

  36. ✅ Comprehensive exception handling for network errors
  37. ✅ JSON parsing error handling
  38. ✅ Structured error responses with specific error descriptions
  39. ✅ Validation error handling with detailed messages

✅ Previously Non-Compliant Issues - Now Fixed

  1. Required Parameter Validation ✅ RESOLVED:
  2. ✅ All required parameters (issuer, response_types_supported, subject_types_supported, id_token_signing_alg_values_supported) are now validated
  3. ✅ Missing parameter detection with detailed error messages

  4. ✅ Null value validation for required parameters

  5. Issuer Validation ✅ RESOLVED:

  6. ✅ HTTPS URL format validation implemented
  7. ✅ Query and fragment component validation implemented

  8. ✅ Host presence validation implemented

  9. URL Validation ✅ RESOLVED:

  10. ✅ Endpoint URL format validation for all supported endpoints
  11. ✅ Absolute URL validation with proper error messages

  12. ✅ HTTP/HTTPS scheme validation

  13. Content Validation ✅ RESOLVED:

  14. ✅ Parameter value format validation for subject types and response types
  15. ✅ Array parameter content validation

  16. ✅ Custom response type component validation

  17. Error Handling ✅ RESOLVED:

  18. ✅ Network exception handling implemented
  19. ✅ JSON parsing exception handling implemented
  20. ✅ Timeout handling implemented (30 second timeout)
  21. ✅ Structured error responses with specific error codes

📋 Optional Features Not Implemented

  1. Extended Discovery Support:
  2. No support for MTLS endpoint aliases
  3. No support for Pushed Authorization Request endpoint
  4. No support for CIBA (Client Initiated Backchannel Authentication) parameters

  5. No support for DPoP (Demonstration of Proof-of-Possession) parameters

  6. Caching and Performance:

  7. No HTTP caching headers support (ETags, Cache-Control)
  8. No retry logic for transient failures
  9. No connection pooling configuration

Note: These are optional features per OpenID Connect Discovery 1.0 specification and do not affect compliance status.

📊 Implementation Coverage Assessment

Core Requirements: ✅ Implemented - ✅ Required parameter validation (issuer, response_types_supported, subject_types_supported, id_token_signing_alg_values_supported) - ✅ Issuer format validation (HTTPS, no query/fragment) - ✅ HTTP response handling with proper error codes - ✅ JSON content-type validation

Parameter Validation: ✅ Implemented - ✅ Subject types validation ("public", "pairwise") - ✅ Response types validation against OpenID Connect specification - ✅ URL format validation for all endpoints - ✅ Parameter presence validation

Error Handling: ✅ Implemented - ✅ Network exception handling - ✅ JSON parsing error handling - ✅ Structured error responses - ✅ Timeout handling (30 seconds)

Optional Features: Partially implemented - ✅ Comprehensive parameter support (35+ standard parameters) - ✅ Advanced validation and error responses - ❌ Extended discovery features (MTLS, PAR, CIBA, DPoP) - ❌ Caching and performance optimizations

Overall: ✅ All required behaviors from OpenID Connect Discovery 1.0 are implemented. Not yet verified through the official OpenID certification process.

📚 Specification References

  • OpenID Connect Discovery 1.0: https://openid.net/specs/openid-connect-discovery-1_0.html
  • Section 3: OpenID Provider Metadata (required parameters)
  • Section 4: Obtaining OpenID Provider Configuration Information
  • RFC 6750: The OAuth 2.0 Authorization Framework: Bearer Token Usage
  • RFC 7517: JSON Web Key (JWK) specification for jwks_uri validation