Adds minimal infrastructure for http, httpApiKey, and oauth2 security…

… schemes.

asynction/common_types.py

@@ -0,0 +1,5 @@
+from typing import Any, Mapping
+
+JSONMappingValue = Any
+JSONMapping = Mapping[str, JSONMappingValue]
+JSONSchema = JSONMapping

asynction/loader.py

@@ -0,0 +1,9 @@
+from importlib import import_module
+from typing import Callable
+
+
+def load_handler(handler_id: str) -> Callable:
+    *module_path_elements, object_name = handler_id.split(".")
+    module = import_module(".".join(module_path_elements))
+
+    return getattr(module, object_name)

asynction/mock_server.py

@@ -37,6 +37,7 @@
 from asynction.types import JSONMapping
 from asynction.types import JSONSchema
 from asynction.types import Message
+from asynction.types import SecurityRequirement
 from asynction.validation import bindings_validator_factory
 from asynction.validation import publish_message_validator_factory
 
@@ -210,7 +211,9 @@ def from_spec(
         )
 
     def _register_handlers(
-        self, default_error_handler: Optional[ErrorHandler] = None
+        self,
+        default_error_handler: Optional[ErrorHandler] = None,
+        server_security: Optional[Sequence[SecurityRequirement]] = None
     ) -> None:
         for namespace, channel in self.spec.channels.items():
             if channel.publish is not None:

asynction/security/__init__.py

@@ -0,0 +1,56 @@
+from typing import Sequence
+
+from asynction.common_types import JSONMapping
+
+from .exceptions import UnregisteredSecurityScheme
+from .exceptions import UnsupportedSecurityScheme
+from .types import SecurityRequirement
+from .types import SecurityScheme
+from .types import SecuritySchemesType
+from .validation import security_handler_factory
+
+
+def _resolve_security_scheme(
+    security: Sequence[JSONMapping], schemes: JSONMapping
+) -> Sequence[JSONMapping]:
+    new_security = []
+    for item in security:
+        for scheme_name, scopes in item.items():
+            if scheme_name not in schemes:
+                raise UnregisteredSecurityScheme
+            scheme = schemes[scheme_name]
+            new_security.append(dict(name=scheme_name, scopes=scopes, scheme=scheme))
+
+    return new_security
+
+
+def _resolve_server_security_schemes(
+    raw_spec: JSONMapping, schemes: JSONMapping
+) -> JSONMapping:
+    for name, server in raw_spec.get("servers", {}).items():
+        if "security" in server:
+            server["security"] = (
+                _resolve_security_scheme(server["security"], schemes) or None
+            )
+
+    return raw_spec
+
+
+def resolve_security_schemes(raw_spec: JSONMapping) -> JSONMapping:
+    schemes = raw_spec.get("components", {}).get("securitySchemes", {})
+    if not schemes:
+        return raw_spec
+    raw_spec = _resolve_server_security_schemes(raw_spec, schemes)
+
+    return raw_spec
+
+
+__all__ = [
+    "SecurityRequirement",
+    "SecurityScheme",
+    "SecuritySchemesType",
+    "security_handler_factory",
+    "resolve_security_schemes",
+    "UnregisteredSecurityScheme",
+    "UnsupportedSecurityScheme",
+]

asynction/security/exceptions.py

@@ -0,0 +1,23 @@
+from asynction.exceptions import AsynctionException
+
+
+class SecurityException(AsynctionException):
+    """
+    Base Security Exception type.
+    """
+    pass
+
+
+class UnregisteredSecurityScheme(SecurityException):
+    """
+    Raised when a security scheme not listed in the securitySchemes section of the
+    spec is used in a ``security`` or ``x-security`` specification
+    """
+    pass
+
+
+class UnsupportedSecurityScheme(SecurityException):
+    """
+    Raised when a specified security scheme is not supported by asynction
+    """
+    pass

asynction/security/types.py

@@ -0,0 +1,190 @@
+from dataclasses import dataclass
+from enum import Enum
+from typing import Mapping, Optional, Sequence, Type
+
+from svarog import register_forge
+from svarog.types import Forge
+
+from asynction.common_types import JSONMapping
+from .exceptions import UnsupportedSecurityScheme
+
+
+class HTTPSecuritySchemeType(Enum):
+    BASIC = "basic"
+    DIGEST = "digest"
+    BEARER = "bearer"
+
+
+class OAuth2FlowType(Enum):
+    """
+    https://www.asyncapi.com/docs/specifications/v2.2.0#oauthFlowsObject
+    """
+    IMPLICIT = "implicit"
+    PASSWORD = "password"
+    CLIENT_CREDENTIALS = "clientCredentials	"
+    AUTHORIZATION_CODE = "authorizationCode"
+
+
+@dataclass
+class OAuth2Flow:
+    """
+    https://www.asyncapi.com/docs/specifications/v2.2.0#oauthFlowObject
+    """
+    scopes: Sequence[str]
+    authorization_url: Optional[str] = None
+    token_url: Optional[str] = None
+    refresh_url: Optional[str] = None
+
+    @staticmethod
+    def forge(
+        type_: Type["OAuth2Flow"],
+        data: JSONMapping,
+        forge: Forge
+    ) -> "OAuth2Flow":
+        return type_(
+            scopes=forge(
+                type_.__annotations__["scopes"],
+                data.get("scopes")
+            ),
+            authorization_url=forge(
+                type_.__annotations__["authorization_url"],
+                data.get("authorizationUrl")
+            ),
+            token_url=forge(
+                type_.__annotations__["token_url"],
+                data.get("tokenUrl")
+            ),
+            refresh_url=forge(
+                type_.__annotations__["refresh_url"],
+                data.get("refreshUrl")
+            )
+        )
+
+
+register_forge(OAuth2Flow, OAuth2Flow.forge)
+
+
+class SecuritySchemesType(Enum):
+    """
+    https://www.asyncapi.com/docs/specifications/v2.2.0#securitySchemeObject
+    """
+    USER_PASSWORD = "userPassword"
+    API_KEY = "apiKey"
+    X509 = "X509"
+    SYMMETRIC_ENCRYPTION = "symmetricEncryption"
+    ASYMMETRIC_ENCRYPTION = "asymmetricEncryption"
+    HTTP_API_KEY = "httpApiKey"
+    HTTP = "http"
+    OAUTH2 = "oauth2"
+    OPENID_CONNECT = "openIdConnect"
+    PLAIN = "plain"
+    SCRAM_SHA256 = "scramSha256"
+    SCRAM_SHA512 = "scramSha512"
+    GSSAPI = "gssapi"
+
+
+@dataclass
+class SecurityScheme:
+    """
+    https://www.asyncapi.com/docs/specifications/v2.2.0#securitySchemeObject
+    """
+    type: SecuritySchemesType
+    description: Optional[str] = None
+    name: Optional[str] = None  # Required for httpApiKey
+    in_: Optional[str] = None  # Required for httpApiKey | apiKey
+    scheme: Optional[HTTPSecuritySchemeType] = None  # Required for http
+    bearer_format: Optional[str] = None  # Optional for http ("bearer")
+    flows: Optional[Mapping[OAuth2FlowType, OAuth2Flow]] = None  # Required for oauth2
+    open_id_connect_url: Optional[str] = None  # Required for openIdConnect
+
+    x_basic_info_func: Optional[str] = None  # Required for http(basic)
+    x_token_info_func: Optional[str] = None  # Required for oauth2
+    x_api_key_info_func: Optional[str] = None  # Required for apiKey
+
+    @staticmethod
+    def forge(
+        type_: Type["SecurityScheme"],
+        data: JSONMapping,
+        forge: Forge
+    ) -> "SecurityScheme":
+
+        scheme_type_raw = data.get("type")
+        if not scheme_type_raw:
+            raise UnsupportedSecurityScheme
+        try:
+            SecuritySchemesType(scheme_type_raw)
+        except ValueError:
+            raise UnsupportedSecurityScheme(scheme_type_raw)
+
+        return type_(
+            type=forge(
+                type_.__annotations__["type"],
+                data.get("type")
+            ),
+            description=forge(
+                type_.__annotations__["description"],
+                data.get("description")
+            ),
+            name=forge(
+                type_.__annotations__["name"],
+                data.get("name")
+            ),
+            in_=forge(
+                type_.__annotations__["in_"],
+                data.get("in")
+            ),
+            scheme=forge(
+                type_.__annotations__["scheme"],
+                data.get("scheme")
+            ),
+            bearer_format=forge(
+                type_.__annotations__["bearer_format"],
+                data.get("bearerFormat")
+            ),
+            flows=forge(
+                type_.__annotations__["flows"],
+                data.get("flows")
+            ),
+            open_id_connect_url=forge(
+                type_.__annotations__["open_id_connect_url"],
+                data.get("openIdConnectUrl")
+            ),
+            x_basic_info_func=forge(
+                type_.__annotations__["x_basic_info_func"],
+                data.get("x-basicInfoFunc")
+            ),
+            x_token_info_func=forge(
+                type_.__annotations__["x_token_info_func"],
+                data.get("x-tokenInfoFunc")
+            ),
+            x_api_key_info_func=forge(
+                type_.__annotations__["x_api_key_info_func"],
+                data.get("x-apiKeyInfoFunc")
+            )
+        )
+
+
+register_forge(SecurityScheme, SecurityScheme.forge)
+
+
+@dataclass
+class SecurityRequirement:
+    # https://www.asyncapi.com/docs/specifications/v2.2.0#securityRequirementObject
+    name: str
+    scopes: Sequence[str]
+    scheme: SecurityScheme
+
+    @staticmethod
+    def forge(
+        type_: Type["SecurityRequirement"],
+        data: JSONMapping,
+        forge: Forge
+    ) -> "SecurityRequirement":
+        return type_(
+            name=forge(type_.__annotations__["name"], data.get("name")),
+            scopes=forge(type_.__annotations__["scopes"], data.get("scopes")),
+            scheme=forge(type_.__annotations__["scheme"], data.get("scheme"))
+        )
+
+
+register_forge(SecurityRequirement, SecurityRequirement.forge)