feat: implement validators, validation strategies, and RemapField transformer

airbyte_cdk/sources/declarative/transformations/config_transformations/__init__.py

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+#
+# Copyright (c) 2025 Airbyte, Inc., all rights reserved.
+#
+
+from .add_fields import ConfigAddFields
+from .remap_field import ConfigRemapField
+from .remove_fields import ConfigRemoveFields
+
+__all__ = ["ConfigRemapField", "ConfigAddFields", "ConfigRemoveFields"]

airbyte_cdk/sources/declarative/transformations/config_transformations/add_fields.py

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+#
+# Copyright (c) 2025 Airbyte, Inc., all rights reserved.
+#
+
+from dataclasses import dataclass, field
+from typing import Any, List, MutableMapping, Optional, Type, Union
+
+import dpath
+
+from airbyte_cdk.sources.declarative.interpolation.interpolated_boolean import InterpolatedBoolean
+from airbyte_cdk.sources.declarative.interpolation.interpolated_string import InterpolatedString
+from airbyte_cdk.sources.declarative.transformations.config_transformations.config_transformation import (
+    ConfigTransformation,
+)
+from airbyte_cdk.sources.types import FieldPointer
+
+
+@dataclass(frozen=True)
+class AddedFieldDefinition:
+    """Defines the field to add on a config"""
+
+    path: FieldPointer
+    value: Union[InterpolatedString, str]
+    value_type: Optional[Type[Any]] = None
+
+
+@dataclass(frozen=True)
+class ParsedAddFieldDefinition:
+    """Defines the field to add on a config"""
+
+    path: FieldPointer
+    value: InterpolatedString
+    value_type: Optional[Type[Any]] = None
+
+
+@dataclass
+class ConfigAddFields(ConfigTransformation):
+    """
+    Transformation which adds fields to a config. The path of the added field can be nested. Adding nested fields will create all
+    necessary parent objects (like mkdir -p).
+
+    This transformation has access to the config being transformed.
+
+    Examples of instantiating this transformation via YAML:
+    - type: ConfigAddFields
+      fields:
+        # hardcoded constant
+        - path: ["path"]
+          value: "static_value"
+
+        # nested path
+        - path: ["path", "to", "field"]
+          value: "static"
+
+        # from config
+        - path: ["derived_field"]
+          value: "{{ config.original_field }}"
+
+        # by supplying any valid Jinja template directive or expression
+        - path: ["two_times_two"]
+          value: "{{ 2 * 2 }}"
+
+    Attributes:
+        fields (List[AddedFieldDefinition]): A list of transformations (path and corresponding value) that will be added to the config
+    """
+
+    fields: List[AddedFieldDefinition]
+    condition: str = ""
+    _parsed_fields: List[ParsedAddFieldDefinition] = field(
+        init=False, repr=False, default_factory=list
+    )
+
+    def __post_init__(self) -> None:
+        self._filter_interpolator = InterpolatedBoolean(condition=self.condition, parameters={})
+
+        for add_field in self.fields:
+            if len(add_field.path) < 1:
+                raise ValueError(
+                    f"Expected a non-zero-length path for the AddFields transformation {add_field}"
+                )
+
+            if not isinstance(add_field.value, InterpolatedString):
+                if not isinstance(add_field.value, str):
+                    raise ValueError(
+                        f"Expected a string value for the AddFields transformation: {add_field}"
+                    )
+                else:
+                    self._parsed_fields.append(
+                        ParsedAddFieldDefinition(
+                            add_field.path,
+                            InterpolatedString.create(add_field.value, parameters={}),
+                            value_type=add_field.value_type,
+                        )
+                    )
+            else:
+                self._parsed_fields.append(
+                    ParsedAddFieldDefinition(
+                        add_field.path,
+                        add_field.value,
+                        value_type=add_field.value_type,
+                    )
+                )
+
+    def transform(
+        self,
+        config: MutableMapping[str, Any],
+    ) -> None:
+        """
+        Transforms a config by adding fields based on the provided field definitions.
+
+        :param config: The user-provided configuration to be transformed
+        """
+        for parsed_field in self._parsed_fields:
+            valid_types = (parsed_field.value_type,) if parsed_field.value_type else None
+            value = parsed_field.value.eval(config, valid_types=valid_types)
+            if not self.condition or self._filter_interpolator.eval(
+                config, value=value, path=parsed_field.path
+            ):
+                dpath.new(config, parsed_field.path, value)

airbyte_cdk/sources/declarative/transformations/config_transformations/config_transformation.py

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+#
+# Copyright (c) 2025 Airbyte, Inc., all rights reserved.
+#
+
+from abc import ABC, abstractmethod
+from typing import Any, MutableMapping
+
+
+class ConfigTransformation(ABC):
+    """
+    Implementations of this class define transformations that can be applied to source configurations.
+    """
+
+    @abstractmethod
+    def transform(
+        self,
+        config: MutableMapping[str, Any],
+    ) -> None:
+        """
+        Transform a configuration by adding, deleting, or mutating fields directly from the config reference passed in argument.
+
+        :param config: The user-provided configuration to be transformed
+        """

airbyte_cdk/sources/declarative/transformations/config_transformations/remap_field.py

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+#
+# Copyright (c) 2025 Airbyte, Inc., all rights reserved.
+#
+
+from dataclasses import dataclass, field
+from typing import Any, List, Mapping, MutableMapping, Union
+
+from airbyte_cdk.sources.declarative.interpolation.interpolated_boolean import InterpolatedBoolean
+from airbyte_cdk.sources.declarative.interpolation.interpolated_mapping import InterpolatedMapping
+from airbyte_cdk.sources.declarative.interpolation.interpolated_string import InterpolatedString
+from airbyte_cdk.sources.declarative.transformations.config_transformations.config_transformation import (
+    ConfigTransformation,
+)
+
+
+@dataclass
+class ConfigRemapField(ConfigTransformation):
+    """
+    Transformation that remaps a field's value to another value based on a static map.
+    """
+
+    map: Mapping[str, Any]
+    field_path: List[Union[InterpolatedString, str]]
+    config: Mapping[str, Any] = field(default_factory=dict)
+
+    def __post_init__(self) -> None:
+        if not self.field_path:
+            raise Exception("field_path cannot be empty.")
+        self._field_path = [
+            InterpolatedString.create(path, parameters={}) for path in self.field_path
+        ]
+        for path_index in range(len(self.field_path)):
+            if isinstance(self.field_path[path_index], str):
+                self._field_path[path_index] = InterpolatedString.create(
+                    self.field_path[path_index], parameters={}
+                )
+        self._map = InterpolatedMapping(self.map, parameters={})
+
+    def transform(
+        self,
+        config: MutableMapping[str, Any],
+    ) -> None:
+        """
+        Transforms a config by remapping a field value based on the provided map.
+        If the original value is found in the map, it's replaced with the mapped value.
+        If the value is not in the map, the field remains unchanged.
+
+        :param config: The user-provided configuration to be transformed
+        """
+        path_components = [path.eval(config) for path in self._field_path]
+
+        current = config
+        for i, component in enumerate(path_components[:-1]):
+            if component not in current:
+                return
+            current = current[component]
+
+            if not isinstance(current, MutableMapping):
+                return
+
+        field_name = path_components[-1]
+
+        mapping = self._map.eval(config=self.config)
+
+        if field_name in current and current[field_name] in mapping:
+            current[field_name] = mapping[current[field_name]]

airbyte_cdk/sources/declarative/transformations/config_transformations/remove_fields.py

@@ -0,0 +1,66 @@
+#
+# Copyright (c) 2025 Airbyte, Inc., all rights reserved.
+#
+from dataclasses import dataclass
+from typing import Any, List, MutableMapping
+
+import dpath
+import dpath.exceptions
+
+from airbyte_cdk.sources.declarative.interpolation.interpolated_boolean import InterpolatedBoolean
+from airbyte_cdk.sources.declarative.transformations.config_transformations.config_transformation import (
+    ConfigTransformation,
+)
+from airbyte_cdk.sources.types import FieldPointer
+
+
+@dataclass
+class ConfigRemoveFields(ConfigTransformation):
+    """
+    A transformation which removes fields from a config. The fields removed are designated using FieldPointers.
+    During transformation, if a field or any of its parents does not exist in the config, no error is thrown.
+
+    If an input field pointer references an item in a list (e.g: ["k", 0] in the object {"k": ["a", "b", "c"]}) then
+    the object at that index is set to None rather than being entirely removed from the list.
+
+    It's possible to remove objects nested in lists e.g: removing [".", 0, "k"] from {".": [{"k": "V"}]} results in {".": [{}]}
+
+    Usage syntax:
+
+    ```yaml
+        config_transformations:
+          - type: RemoveFields
+            field_pointers:
+              - ["path", "to", "field1"]
+              - ["path2"]
+            condition: "{{ config.some_flag }}" # Optional condition
+    ```
+
+    Attributes:
+        field_pointers (List[FieldPointer]): pointers to the fields that should be removed
+        condition (str): Optional condition that determines if the fields should be removed
+    """
+
+    field_pointers: List[FieldPointer]
+    condition: str = ""
+
+    def __post_init__(self) -> None:
+        self._filter_interpolator = InterpolatedBoolean(condition=self.condition, parameters={})
+
+    def transform(
+        self,
+        config: MutableMapping[str, Any],
+    ) -> None:
+        """
+        Transforms a config by removing fields based on the provided field pointers.
+
+        :param config: The user-provided configuration to be transformed
+        """
+        if self.condition and not self._filter_interpolator.eval(config):
+            return
+
+        for pointer in self.field_pointers:
+            try:
+                dpath.delete(config, pointer)
+            except dpath.exceptions.PathNotFound:
+                pass

airbyte_cdk/sources/declarative/validators/__init__.py

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+#
+# Copyright (c) 2025 Airbyte, Inc., all rights reserved.
+#
+
+from airbyte_cdk.sources.declarative.validators.dpath_validator import DpathValidator
+from airbyte_cdk.sources.declarative.validators.predicate_validator import PredicateValidator
+from airbyte_cdk.sources.declarative.validators.validate_adheres_to_schema import (
+    ValidateAdheresToSchema,
+)
+from airbyte_cdk.sources.declarative.validators.validation_strategy import ValidationStrategy
+from airbyte_cdk.sources.declarative.validators.validator import Validator
+
+__all__ = [
+    "Validator",
+    "DpathValidator",
+    "ValidationStrategy",
+    "ValidateAdheresToSchema",
+    "PredicateValidator",
+]

airbyte_cdk/sources/declarative/validators/dpath_validator.py

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+#
+# Copyright (c) 2025 Airbyte, Inc., all rights reserved.
+#
+
+from dataclasses import dataclass
+from typing import Any, List, Union
+
+import dpath.util
+
+from airbyte_cdk.sources.declarative.interpolation.interpolated_string import InterpolatedString
+from airbyte_cdk.sources.declarative.validators.validation_strategy import ValidationStrategy
+from airbyte_cdk.sources.declarative.validators.validator import Validator
+
+
+@dataclass
+class DpathValidator(Validator):
+    """
+    Validator that extracts a value at a specific path in the input data
+    and applies a validation strategy to it.
+    """
+
+    field_path: List[Union[InterpolatedString, str]]
+    strategy: ValidationStrategy
+
+    def __post_init__(self) -> None:
+        self._field_path = [
+            InterpolatedString.create(path, parameters={}) for path in self.field_path
+        ]
+        for path_index in range(len(self.field_path)):
+            if isinstance(self.field_path[path_index], str):
+                self._field_path[path_index] = InterpolatedString.create(
+                    self.field_path[path_index], parameters={}
+                )
+
+    def validate(self, input_data: dict[str, Any]) -> None:
+        """
+        Extracts the value at the specified path and applies the validation strategy.
+
+        :param input_data: Dictionary containing the data to validate
+        :raises ValueError: If the path doesn't exist or validation fails
+        """
+        path = [path.eval({}) for path in self._field_path]
+
+        if len(path) == 0:
+            raise ValueError("Field path is empty")
+
+        if "*" in path:
+            try:
+                values = dpath.values(input_data, path)
+                for value in values:
+                    self.strategy.validate(value)
+            except KeyError as e:
+                raise ValueError(f"Error validating path '{self.field_path}': {e}")
+        else:
+            try:
+                value = dpath.get(input_data, path)
+                self.strategy.validate(value)
+            except KeyError as e:
+                raise ValueError(f"Error validating path '{self.field_path}': {e}")

airbyte_cdk/sources/declarative/validators/predicate_validator.py

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+#
+# Copyright (c) 2025 Airbyte, Inc., all rights reserved.
+#
+
+from dataclasses import dataclass
+from typing import Any
+
+from airbyte_cdk.sources.declarative.validators.validation_strategy import ValidationStrategy
+
+
+@dataclass
+class PredicateValidator:
+    """
+    Validator that applies a validation strategy to a value.
+    """
+
+    value: Any
+    strategy: ValidationStrategy
+
+    def validate(self) -> None:
+        """
+        Applies the validation strategy to the value.
+
+        :raises ValueError: If validation fails
+        """
+        self.strategy.validate(self.value)