ring-sandbox

Typed Python client and offline emulator for the Ring Partner API (api.amazonvision.com).

Ring ships no SDK and no local simulator. Testing a partner integration today means a real device, a 30-minute Playground token, or hand-rolled mocks. ring-sandbox gives you:

• RingClient – a small, typed, synchronous client over httpx covering users, device discovery (with ?include= side-loading), status, capabilities, configurations, location, event history (auto-pagination), image snapshots (303 redirect flow), media clips (200/206/416 semantics), and chime playback.
• Webhook helpers – HMAC-SHA256 X-Signature signing/verification over raw bytes, v1.1 payload construction, and parsing into a WebhookEvent.
• Emulator – a FastAPI app that speaks the same JSON:API shapes at /v1/..., plus a /_sandbox control plane to inject events, register webhook targets (the emulator signs and delivers them), add devices (doorbells, cameras, chimes, Early Access sensors), and reset.
• Scenarios – scripted event sequences (delivery, home_aide_visit, short_visit, no_show, device_flap, or your own YAML), replayable in real time, time-compressed, or back-dated into history.
• pytest plugin – ring_client, ring_control, ring_world fixtures that run the emulator in-process with no sockets.
• Recorder – ring-sandbox record --token ... snapshots real Playground/production responses into JSON fixtures.

Install

pip install "ring-sandbox[server]"      # client + emulator + CLI
pip install ring-sandbox                # client only

# development: pinned, CI-tested dependency set
pip install -r requirements-dev.txt -e ".[dev]"

Client

from ring_sandbox import RingClient

with RingClient(token) as ring:                       # production by default
    for d in ring.devices(include=["status", "capabilities"]):
        print(d.name, d.online, d.capabilities.is_camera)

    cam = next(d for d in ring.devices(include=["capabilities"]) if d.capabilities.is_camera)
    for ev in ring.events(cam.id, event_types=["motion.human", "ding"]):
        print(ev.attributes.started_at, ev.attributes.event_type)

    snap = ring.snapshot_latest(cam.id, start=some_datetime)   # follows the 303 to the pre-signed URL
    clip = ring.clip(cam.id, timestamp=some_datetime, duration_ms=10_000)
    if clip.partial: print("only", clip.actual_length_ms, "ms available")

Media endpoints 303-redirect to a pre-signed URL on another host. Redirects are followed manually: bearer credentials and cookies are never forwarded, the response body is capped by max_media_bytes, and off-origin targets must be allowlisted — pass media_origins=["https://media-host.example", "*.amazonaws.com"] when talking to real Ring. JSON endpoints never follow redirects; device ids are treated as opaque single path segments.

Point it at the emulator with RingClient(token, base_url="http://127.0.0.1:8787").

Emulator

ring-sandbox serve --port 8787
ring-sandbox webhook http://localhost:8000/webhooks/ring --key my-hmac-key
ring-sandbox play delivery --speed 5           # courier: vehicle -> human -> ding -> package -> vehicle
ring-sandbox play home_aide_visit --backdate   # 90-minute visit written straight into history
ring-sandbox play examples/late_arrival.yml    # your own scenario: name, description, steps
ring-sandbox inject --type motion_detected --sub-type human

Custom scenarios are plain YAML — steps entries take offset_s, type, optional sub_type, device (id or name), and duration_ms. See examples/ for documented files: late_arrival.yml (aide shows 25 min late), partial_blackout.yml (camera dies mid-visit — departure unobserved), visitor_not_worker.yml (courier activity in the aide's window).

Interactive docs at http://127.0.0.1:8787/_sandbox/docs. Drop real default.jpg / default.mp4 (or <device_id>.jpg) in a folder and pass --media-dir to serve real media instead of placeholders.

Fidelity notes

The emulator reproduces the parts of the API that bite integrators:

Webhooks

from ring_sandbox import webhooks

@app.post("/webhooks/ring")
async def ring_hook(request: Request):
    raw = await request.body()                                    # raw bytes, never re-serialized JSON
    ev = webhooks.parse(raw, signing_key=KEY, signature=request.headers.get("X-Signature"))
    if ev.event_type == "motion_detected" and ev.sub_type == "human": ...

Chaos fault injection

ring-sandbox serve --chaos storm runs the emulator with a fault-injection profile: webhook deliveries can be duplicated, dropped, or delayed with jitter, and history/media endpoints can return transient 500s. Presets: delivery (dup/drop/delay only), flaky (endpoint failures only), storm (both). A custom profile is a key=value list: --chaos drop=0.2,duplicate=0.4,jitter_ms=1500. --chaos-seed N makes the fault stream deterministic for reproducible runs.

Every injected fault is recorded — GET /_sandbox/chaos returns the active profile plus the actions taken so far (webhook.dropped, webhook.duplicated, webhook.delayed with the applied ms). POST /_sandbox/chaos adjusts rates live ({"drop": 0.5}) without restarting. The point is proving the receiver: a correct consumer dedupes re-delivered request_ids, tolerates out-of-order arrival, and keeps working through flaky polls.

pytest

def test_visit_detection(ring_client, ring_control):
    ring_control.post("/_sandbox/events", json={"type": "motion_detected", "sub_type": "human"})
    cam = ring_client.devices()[0]
    assert next(ring_client.events(cam.id)).attributes.event_type == "motion"

Status

Built during the Amazon Developer Hackathon 2026. Response shapes follow the public documentation; where the docs are ambiguous the emulator follows what the Playground returns (see fixtures/). Sensors and chimes are Early Access upstream and may change.

MIT licensed.