envresolve 0.1.4

Resolve env vars from secret stores.

envresolve

Resolve environment variables from secret stores like Azure Key Vault.

Features

• Variable expansion: Expand ${VAR} and $VAR syntax in strings
• Secret resolution: Fetch secrets from Azure Key Vault (more providers coming)
• Circular reference detection: Prevents infinite loops in variable chains
• Type-safe: Full mypy type checking support

Quick Start

Variable Expansion

Expand variables without connecting to external services:

from envresolve import expand_variables

env = {"VAULT": "corp-kv", "SECRET": "db-password"}
result = expand_variables("akv://${VAULT}/${SECRET}", env)
print(result)  # akv://corp-kv/db-password

Load from .env File

Load environment variables from a .env file with automatic secret resolution:

import envresolve

# .env file content:
# VAULT_NAME=my-vault
# DATABASE_URL=akv://${VAULT_NAME}/db-url
# API_KEY=akv://${VAULT_NAME}/api-key

# Requires: pip install envresolve[azure]
# Requires: Azure authentication (az login, Managed Identity, etc.)
envresolve.register_azure_kv_provider()

# Load .env and resolve all secret URIs
# By default, exports to os.environ
resolved_vars = envresolve.load_env(".env")

# Or load without exporting
resolved_vars = envresolve.load_env(".env", export=False)

Direct Secret Resolution

Fetch individual secrets from Azure Key Vault:

import envresolve

# Requires: pip install envresolve[azure]
# Requires: Azure authentication (az login, Managed Identity, etc.)
try:
    envresolve.register_azure_kv_provider()
    secret_value = envresolve.resolve_secret("akv://corp-vault/db-password")
    print(secret_value)
except envresolve.ProviderRegistrationError as e:
    print(f"Azure SDK not available: {e}")
except envresolve.SecretResolutionError as e:
    print(f"Failed to fetch secret: {e}")

Custom Provider Configuration

Inject custom provider instances for advanced scenarios (testing, custom credentials, etc.):

import envresolve
from envresolve.providers.azure_kv import AzureKVProvider
from azure.identity import ManagedIdentityCredential

# Create custom provider with specific credential
custom_provider = AzureKVProvider(
    credential=ManagedIdentityCredential(client_id="your-client-id")
)

# Register the custom provider
envresolve.register_azure_kv_provider(provider=custom_provider)

# Now use envresolve as normal
secret = envresolve.resolve_secret("akv://vault/secret")

This is particularly useful for:

• Testing: Inject mock providers without patching internal implementation details
• Custom authentication: Use specific Azure credentials (service principal, managed identity, etc.)
• Provider configuration: Pre-configure providers with custom settings

Resolve Existing Environment Variables

Resolve secret URIs already set in os.environ (useful for containerized applications):

import os
import envresolve

# Environment variables set by container orchestrator or parent process
os.environ["API_KEY"] = "akv://prod-vault/api-key"
os.environ["DB_PASSWORD"] = "akv://prod-vault/db-password"

# Requires: pip install envresolve[azure]
envresolve.register_azure_kv_provider()

# Resolve all environment variables containing secret URIs
resolved = envresolve.resolve_os_environ()

# Resolve only specific keys
resolved = envresolve.resolve_os_environ(keys=["API_KEY"])

# Resolve variables with prefix and strip the prefix
# DEV_API_KEY -> API_KEY, DEV_DB_URL -> DB_URL
os.environ["DEV_API_KEY"] = "akv://dev-vault/api-key"
os.environ["DEV_DB_URL"] = "akv://dev-vault/db-url"
resolved = envresolve.resolve_os_environ(prefix="DEV_")

Installation

# Basic installation (variable expansion only)
pip install envresolve

# With Azure Key Vault support
pip install envresolve[azure]

Documentation

Full documentation: https://osoekawaitlab.github.io/envresolve/

Development

Setup

This project uses uv for dependency management and nox for task automation:

# Install uv (if not already installed)
pip install uv

# Clone the repository
git clone https://github.com/osoekawaitlab/envresolve.git
cd envresolve

# Install dependencies (including dev dependencies)
uv pip install -e ".[azure]" --group=dev

Running Tests

# Quick test during development
nox -s tests_unit      # Unit tests only (fast)
nox -s tests_e2e       # E2E tests with mocked Azure SDK

# Full test suite
nox -s tests           # All tests with coverage report (HTML in htmlcov/)

# Test across Python versions
nox -s tests_all_versions  # Test on Python 3.10-3.14

# Test without Azure SDK
nox -s tests_without_azure  # For environments without Azure dependencies

Code Quality

# Run all quality checks
nox -s quality         # Type checking (mypy) + linting (ruff)

# Individual checks
nox -s mypy            # Type checking only
nox -s lint            # Linting only
nox -s format_code     # Auto-format code

# Run everything
nox -s check_all       # Tests + quality checks

Live Azure Tests

Optional integration tests against real Azure Key Vault:

# One-time setup
cd infra/terraform
cp terraform.tfvars.example terraform.tfvars
# Edit terraform.tfvars with your Azure credentials
terraform init
terraform apply

# Before running tests
az login
source scripts/setup_live_tests.sh

# Run live tests
nox -s tests_live

See Live Azure Tests documentation for detailed setup instructions.

Build Documentation

# Build documentation
nox -s docs_build

# Serve documentation locally (with live reload)
nox -s docs_serve      # Open http://localhost:8000

Contributing

See Contributing Guide for guidelines on:

• Code style and conventions
• Test-driven development workflow
• Creating issues and pull requests
• Architecture Decision Records (ADRs)