Re-upload: CI infrastructure issue resolved, all tests verified passing

envschema/schema.py

@@ -0,0 +1,110 @@
+"""Schema models for environment variable definitions."""
+
+import json
+from enum import Enum
+from pathlib import Path
+from typing import Optional
+
+import yaml
+from pydantic import BaseModel, Field, field_validator
+
+
+class EnvVarType(str, Enum):
+    """Supported environment variable types."""
+
+    STRING = "str"
+    INTEGER = "int"
+    BOOLEAN = "bool"
+    LIST = "list"
+
+
+class EnvVar(BaseModel):
+    """Definition of a single environment variable."""
+
+    name: str = Field(..., description="Variable name (e.g., DATABASE_URL)")
+    type: EnvVarType = Field(default=EnvVarType.STRING, description="Variable type")
+    required: bool = Field(default=False, description="Whether variable is required")
+    default: Optional[str] = Field(default=None, description="Default value if optional")
+    description: Optional[str] = Field(default=None, description="Variable description")
+    pattern: Optional[str] = Field(default=None, description="Regex pattern for validation")
+
+    @field_validator("name")
+    @classmethod
+    def name_must_be_valid_env_var(cls, v: str) -> str:
+        if not v.replace("_", "").replace("-", "").isalnum():
+            raise ValueError("Variable name must contain only alphanumeric characters, underscores, and hyphens")
+        return v.upper()
+
+
+class Schema(BaseModel):
+    """Schema containing all environment variable definitions."""
+
+    version: Optional[str] = Field(default="1.0", description="Schema version")
+    envvars: list[EnvVar] = Field(default_factory=list, alias="envVars")
+
+    model_config = {"populate_by_name": True}
+
+    def get_var(self, name: str) -> Optional[EnvVar]:
+        """Get an environment variable by name."""
+        name_upper = name.upper()
+        for var in self.envvars:
+            if var.name.upper() == name_upper:
+                return var
+        return None
+
+    def get_required_vars(self) -> list[EnvVar]:
+        """Get all required environment variables."""
+        return [var for var in self.envvars if var.required]
+
+
+def load_schema_from_file(file_path: str) -> Schema:
+    """Load schema from a JSON or YAML file.
+
+    Args:
+        file_path: Path to the schema file
+
+    Returns:
+        Parsed Schema object
+
+    Raises:
+        FileNotFoundError: If schema file doesn't exist
+        ValueError: If schema format is invalid
+    """
+    path = Path(file_path)
+    if not path.exists():
+        raise FileNotFoundError(f"Schema file not found: {file_path}")
+
+    content = path.read_text()
+
+    if path.suffix.lower() in [".yaml", ".yml"]:
+        return load_yaml_schema(content)
+    elif path.suffix.lower() == ".json":
+        return load_json_schema(content)
+    else:
+        raise ValueError(f"Unsupported schema format: {path.suffix}. Use .json or .yaml")
+
+
+def load_json_schema(content: str) -> Schema:
+    """Load schema from JSON content."""
+    try:
+        data = json.loads(content)
+    except json.JSONDecodeError as e:
+        raise ValueError(f"Invalid JSON schema: {e}")
+
+    try:
+        return Schema.model_validate(data)
+    except Exception as e:
+        raise ValueError(f"Invalid schema structure: {e}")
+
+
+def load_yaml_schema(content: str) -> Schema:
+    """Load schema from YAML content."""
+    try:
+        data = yaml.safe_load(content)
+    except yaml.YAMLError as e:
+        raise ValueError(f"Invalid YAML schema: {e}")
+
+    try:
+        return Schema.model_validate(data)
+    except Exception as e:
+        raise ValueError(f"Invalid schema structure: {e}")