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@ledgerhq/hw-transport-webusb
Advanced tools
Ledger Hardware Wallet WebUSB implementation of the communication layer
Allows to communicate with Ledger Hardware Wallets.
[Web] (WebUSB) – WebUSB check browser support.
The transport functions create()
and listen()
must be called in the context of an user interaction (like a "click" event), otherwise it fails with DOM Exception. This is by WebUSB design. You also must run on HTTPS.
In WebUSB, we have a "permission native" modal that appears when we need to "request" a device. This is required at-least-once for the user to accept, and then we can open the transport without triggering this modal. However, in both cases, it must happen in context of a click like explain above. Our current implementation tradeoff is to abstract this out and only trigger the permission modal if no device are listed. This might change in the future.
In term of UX, there are two classical usecases:
in (1) case, you can just do your logic in each button (Get Address / Sign Transaction) time (create it, do the logic, close it).
in (2) case, you will need to have a Connect button that appear when you don’t have the connection yet. and you need to hook to the “disconnect” event to potentially make the UI reflect that and require user to click again on that Connect button, because you can’t automatically create()
/open()
again.
WebUSB is currently only supported on Google Chrome / Chromium.
Extends Transport
WebUSB Transport implementation
device
USBDeviceinterfaceNumber
numberimport TransportWebUSB from "@ledgerhq/hw-transport-webusb";
...
TransportWebUSB.create().then(transport => ...)
Release the transport device
Returns Promise<void>
Exchange with the device using APDU protocol.
apdu
BufferReturns Promise<Buffer> a promise of apdu response
Check if WebUSB transport is supported.
List the WebUSB devices that was previously authorized by the user.
Actively listen to WebUSB devices and emit ONE device that was either accepted before, if not it will trigger the native permission UI.
Important: it must be called in the context of a UI click!
observer
Observer<DescriptorEvent<USBDevice>>Returns Subscription
Similar to create() except it will always display the device permission (even if some devices are already accepted).
Similar to create() except it will never display the device permission (it returns a Promise<?Transport>, null if it fails to find a device).
Create a Ledger transport with a USBDevice
device
USBDeviceFAQs
Ledger Hardware Wallet WebUSB implementation of the communication layer
The npm package @ledgerhq/hw-transport-webusb receives a total of 29,576 weekly downloads. As such, @ledgerhq/hw-transport-webusb popularity was classified as popular.
We found that @ledgerhq/hw-transport-webusb demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 8 open source maintainers collaborating on the project.
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