reflex-r2-upload 0.1.0

Browser-direct Cloudflare R2 uploads for Reflex

reflex-r2-upload

Language: English · 中文

A Reflex custom component for browser-direct uploads to Cloudflare R2 (presigned PUT). Large files never pass through your Python backend.

What it does

• upload_zone — upload UI (styled or headless via .root)
• wrap_app(app) — one-line Reflex integration
• parse_upload_payload — typed callback after upload (path, filename, optional public URL)
• Public CDN URLs or private-bucket signed_read_url for temporary reads

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Installation

pip install reflex-r2-upload

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Configuration

Cloudflare R2 credentials are required. Use either method below.

Option 1: Environment variables

Set in the process environment (export, .env + load_dotenv(), or your host's secret manager):

Variable	Required	Description
R2_ACCOUNT_ID	Yes	Cloudflare account ID
R2_ACCESS_KEY_ID	Yes	R2 API token access key
R2_SECRET_ACCESS_KEY	Yes	R2 API token secret
R2_BUCKET_NAME	Yes	Bucket name
R2_PUBLIC_BASE_URL	No	Public CDN / custom domain (see examples)
REFLEX_R2_PRESIGN_EXPIRES	No	Upload URL TTL (seconds), default 600
REFLEX_R2_GET_EXPIRES	No	Private read URL TTL (seconds), default 3600

Configure CORS on the R2 bucket so your site origin can PUT to the storage endpoint.

Option 2: R2Config in code

import reflex as rx
import reflex_r2_upload as r2

r2_config = r2.R2Config(
    account_id="...",
    access_key_id="...",
    secret_access_key="...",
    bucket_name="my-bucket",
    public_base_url="https://assets.example.com",  # optional
)

app = rx.App()
app.add_page(index)
r2.wrap_app(app, r2_config=r2_config)

You can also call r2.configure_r2(r2_config) before the first upload request.

Code config overrides environment variables. Keep secrets on the server only — never in the frontend or rx.State.

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Usage

import reflex as rx
import reflex_r2_upload as r2


class State(rx.State):
    @rx.event
    def on_uploaded(self, payload_json: r2.UploadPayloadJson):
        try:
            result = r2.parse_upload_payload(payload_json)
        except r2.UploadPayloadError as error:
            self.message = error.message
            return
        file = result.file
        self.message = f"Uploaded: {file.original_filename}"
        self.storage_path = file.storage_path


def index() -> rx.Component:
    return rx.container(
        r2.upload_zone(
            key_prefix="users/1/uploads",
            accept=".glb,model/gltf-binary",
            allowed_extensions=[".glb"],
            on_success=State.on_uploaded,
        ),
        padding="2em",
    )


app = rx.App()
app.add_page(index)
r2.wrap_app(app)

In this example:

1. Import reflex_r2_upload.
2. Add upload_zone to your page; key_prefix is the object path prefix in the bucket.
3. After add_page, call wrap_app(app) (or wrap_app(app, r2_config=...)).
4. On success, on_success receives JSON; parse it with parse_upload_payload.

Headless upload area (custom styling):

r2.upload_zone.root(
    rx.vstack(rx.icon("upload"), rx.text("Drop or click to upload"), spacing="2", align="center"),
    key_prefix="users/1/uploads",
    on_success=State.on_uploaded,
    class_name="rounded-xl border-2 border-dashed p-8",
)

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Examples

Public read (R2_PUBLIC_BASE_URL or R2Config.public_base_url)

file = r2.parse_upload_payload(payload_json).file
if file.public_url:
    return rx.image(src=file.public_url)

Private read (no public domain)

@rx.event
def preview(self):
    # Production: authorize before issuing a read URL
    self.temp_url = r2.signed_read_url(self.storage_path)

Check public vs private mode

if r2.is_public_access_configured():
    ...

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API overview

Symbol	Purpose
wrap_app(app, r2_config=...)	Integration entry point
R2Config / configure_r2	Credentials in code
upload_zone / upload_zone.root	Upload components
parse_upload_payload	Parse upload callback
signed_read_url	Temporary private read URL
is_public_access_configured()	Whether a public domain is configured

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Documentation

📖 Docs (English) · 📖 文档（中文） · README 中文

English	中文
Configuration	配置
Bridge Payload	Bridge Payload
Private bucket	私有桶
Architecture	架构与实现

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License

MIT

Contributing

Pull requests are welcome. For larger changes, please open an issue first.

Acknowledgments

• Reflex
• Cloudflare R2