anyuri

Polymorphic URI types for Python. AnyUri auto-dispatches to the right subclass based on the input string, works as a plain str, and integrates with Pydantic v1/v2.

The Problem

Python data pipelines routinely handle assets from multiple backends — a thumbnail might live at gs://bucket/img.jpg, a report at s3://bucket/report.pdf, and a local fixture at /tmp/test.png. Without a shared abstraction, code degrades into scattered if uri.startswith("gs://") checks, duplicated normalization logic, and type annotations that lie (str accepts anything).

Cloud storage also has a dual-representation problem: the same GCS object is gs://bucket/key in SDK calls but https://storage.googleapis.com/bucket/key in HTTP clients and CDNs. Converting between them by hand is error-prone and leaks storage-specific logic everywhere.

anyuri solves both:

• Polymorphic dispatch — AnyUri(value) returns the right subtype for the scheme; your code branches on type, not string prefixes.
• Dual representation — as_uri() gives the canonical SDK form; str(uri) gives the HTTPS form accepted by any HTTP client. Conversion is automatic.
• Zero friction — every AnyUri subclass is a str, so it passes to any existing API without casting or adapters.

from anyuri import AnyUri
from anyuri.providers import GSUri, S3Uri  # registers cloud providers

AnyUri("https://example.com/1.jpg")    # → HttpUri
AnyUri("gs://bucket/key.jpg")          # → GSUri
AnyUri("s3://bucket/key.jpg")          # → S3Uri
AnyUri("/local/path.jpg")              # → FileUri

uri = AnyUri("gs://bucket/key.jpg")
uri.as_uri()     # "gs://bucket/key.jpg"
uri.as_source()  # "https://storage.googleapis.com/bucket/key.jpg"
str(uri)         # "https://storage.googleapis.com/bucket/key.jpg"
uri == "https://storage.googleapis.com/bucket/key.jpg"  # True

Installation

pip install anyuri                  # core only (HttpUri, FileUri)
pip install anyuri[gcs]             # + GSUri
pip install anyuri[s3]              # + S3Uri
pip install anyuri[azure]           # + AzureUri
pip install anyuri[all]             # all cloud providers
pip install anyuri[all,pydantic]    # + Pydantic integration

Supported URI Types

Custom URI Types

from anyuri import AnyUri
from anyuri._exceptions import UriSchemaError

@AnyUri.register
class SFTPUri(AnyUri):
    def __new__(cls, value):
        return str.__new__(cls, cls._validate(value))

    @classmethod
    def _validate(cls, value):
        v = str(value)
        if not v.startswith("sftp://"):
            raise UriSchemaError(f"Not an SFTP URI: {v!r}")
        return v

    @classmethod
    def validate(cls, value):
        return cls(cls._validate(value))

AnyUri("sftp://host/path")  # → SFTPUri

Acknowledgements

This project would not exist without the support of my wife, Agnes, whose patience and encouragement make everything possible.

Pydantic Integration

from pydantic import BaseModel
from anyuri import AnyUri
from anyuri.providers import GSUri

class Asset(BaseModel):
    uri: AnyUri

Asset(uri="gs://bucket/key.jpg").uri  # GSUri instance
Asset(uri="https://example.com").uri  # HttpUri instance