feat(flagd): use json schema validation instead of custom validation

Signed-off-by: Simon Schrottner <simon.schrottner@dynatrace.com>

Author: aepfli

providers/openfeature-provider-flagd/openfeature/schemas

@@ -24,7 +24,8 @@ dependencies = [
   "panzi-json-logic>=1.0.1",
   "semver>=3,<4",
   "pyyaml>=6.0.1",
-  "cachebox"
+  "cachebox",
+  "jsonschema"
 ]
 requires-python = ">=3.9"
 
@@ -96,7 +97,9 @@ outputs = ["{proto_path}/{proto_name}_pb2_grpc.pyi"]
 [tool.hatch.build.targets.sdist]
 exclude = [
   ".gitignore",
-  "/openfeature",
+]
+include = [
+    "/openfeature/schemas/json/*.json"
 ]
 
 [tool.hatch.build.targets.wheel]

providers/openfeature-provider-flagd/pyproject.toml

@@ -2,24 +2,30 @@
 import re
 import typing
 from dataclasses import dataclass
+from pathlib import Path
+
+from jsonschema import Draft7Validator, ValidationError
+from referencing import Registry, Resource
 
 from openfeature.event import ProviderEventDetails
 from openfeature.exception import ParseError
 
+project_root = Path(__file__).resolve().parents[7]
+SCHEMAS = project_root / "openfeature/schemas/json"
+
+
+def retrieve_from_filesystem(uri: str) -> Resource:
+    path = SCHEMAS / Path(uri.removeprefix("https://flagd.dev/schema/v0/"))
+    contents = json.loads(path.read_text())
+    return Resource.from_contents(contents)
 
-def _validate_metadata(key: str, value: typing.Union[float, int, str, bool]) -> None:
-    if key is None:
-        raise ParseError("Metadata key must be set")
-    elif not isinstance(key, str):
-        raise ParseError(f"Metadata key {key} must be of type str, but is {type(key)}")
-    elif not key:
-        raise ParseError("key must not be empty")
-    if value is None:
-        raise ParseError(f"Metadata value for key {key} must be set")
-    elif not isinstance(value, (float, int, str, bool)):
-        raise ParseError(
-            f"Metadata value {value} for key  {key} must be of type float, int, str or bool, but is {type(value)}"
-        )
+
+registry = Registry(retrieve=retrieve_from_filesystem)  # type: ignore[call-arg]
+
+validator = Draft7Validator(
+    registry=registry,
+    schema={"$ref": "https://flagd.dev/schema/v0/flags.json"},
+)
 
 
 class FlagStore:
@@ -39,6 +45,11 @@ def get_flag(self, key: str) -> typing.Optional["Flag"]:
         return self.flags.get(key)
 
     def update(self, flags_data: dict) -> None:
+        try:
+            validator.validate(flags_data)
+        except ValidationError as e:
+            raise ParseError(e.message) from e
+
         flags = flags_data.get("flags", {})
         metadata = flags_data.get("metadata", {})
         evaluators: typing.Optional[dict] = flags_data.get("$evaluators")
@@ -54,8 +65,6 @@ def update(self, flags_data: dict) -> None:
             raise ParseError("`flags` key of configuration must be a dictionary")
         if not isinstance(metadata, dict):
             raise ParseError("`metadata` key of configuration must be a dictionary")
-        for key, value in metadata.items():
-            _validate_metadata(key, value)
 
         self.flags = {key: Flag.from_dict(key, data) for key, data in flags.items()}
         self.flag_set_metadata = metadata
@@ -79,29 +88,9 @@ class Flag:
     ] = None
 
     def __post_init__(self) -> None:
-        if not self.state or not isinstance(self.state, str):
-            raise ParseError("Incorrect 'state' value provided in flag config")
-
-        if not self.variants or not isinstance(self.variants, dict):
-            raise ParseError("Incorrect 'variants' value provided in flag config")
-
-        if not self.default_variant or not isinstance(
-            self.default_variant, (str, bool)
-        ):
-            raise ParseError("Incorrect 'defaultVariant' value provided in flag config")
-
-        if self.targeting and not isinstance(self.targeting, dict):
-            raise ParseError("Incorrect 'targeting' value provided in flag config")
-
-        if self.default_variant not in self.variants:
+        if self.default_variant and self.default_variant not in self.variants:
             raise ParseError("Default variant does not match set of variants")
 
-        if self.metadata:
-            if not isinstance(self.metadata, dict):
-                raise ParseError("Flag metadata is not a valid json object")
-            for key, value in self.metadata.items():
-                _validate_metadata(key, value)
-
     @classmethod
     def from_dict(cls, key: str, data: dict) -> "Flag":
         if "defaultVariant" in data:

providers/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/resolvers/process/flags.py

@@ -7,11 +7,8 @@
 from openfeature import api
 from openfeature.contrib.provider.flagd import FlagdProvider
 from openfeature.contrib.provider.flagd.config import ResolverType
-from openfeature.contrib.provider.flagd.resolvers.process.flags import (
-    _validate_metadata,
-)
 from openfeature.event import EventDetails, ProviderEvent
-from openfeature.exception import ErrorCode, ParseError
+from openfeature.exception import ErrorCode
 
 
 def create_client(file_name):
@@ -106,43 +103,3 @@ def test_invalid_flag_set_metadata(file_name):
         if now - start > max_timeout:
             raise AssertionError()
         sleep(0.01)
-
-
-def test_validate_metadata_with_none_key():
-    try:
-        _validate_metadata(None, "a")
-    except ParseError:
-        return
-    raise AssertionError()
-
-
-def test_validate_metadata_with_empty_key():
-    try:
-        _validate_metadata("", "a")
-    except ParseError:
-        return
-    raise AssertionError()
-
-
-def test_validate_metadata_with_non_string_key():
-    try:
-        _validate_metadata(1, "a")
-    except ParseError:
-        return
-    raise AssertionError()
-
-
-def test_validate_metadata_with_non_string_value():
-    try:
-        _validate_metadata("a", [])
-    except ParseError:
-        return
-    raise AssertionError()
-
-
-def test_validate_metadata_with_none_value():
-    try:
-        _validate_metadata("a", None)
-    except ParseError:
-        return
-    raise AssertionError()