@ledgerhq/live-common
Version:
Common ground for the Ledger Live apps
77 lines • 3.27 kB
JavaScript
import { log } from "@ledgerhq/logs";
import { Observable, firstValueFrom, from } from "rxjs";
import semver from "semver";
import { createExchange, isExchangeTypeNg } from "@ledgerhq/hw-app-exchange";
import { withDevice } from "../../hw/deviceAccess";
import { getProviderConfig, getSwapProvider } from "../providers";
const withDevicePromise = (deviceId, fn) => firstValueFrom(withDevice(deviceId)(transport => from(fn(transport))));
const startExchange = (input) => {
return new Observable(o => {
let unsubscribed = false;
const { device, exchangeType, appVersion, provider } = input;
const startExchangeAsync = async () => {
await withDevicePromise(device.deviceId, async (transport) => {
log("exchange", `attempt to connect to ${device.deviceId}`);
let version;
if (unsubscribed)
return;
if (provider) {
switch (exchangeType) {
case 0 /* ExchangeTypes.Swap */: {
const providerConfig = await getSwapProvider(provider);
if (providerConfig.useInExchangeApp === false) {
throw new Error(`Unsupported provider type ${providerConfig.type}`);
}
version = providerConfig.version;
break;
}
default: {
const providerConfig = await getProviderConfig(exchangeType, provider);
version = providerConfig.version;
}
}
}
if (!checkNgPrerequisite(exchangeType, appVersion)) {
throw new Error("Incompatible AppExchange version with NG command");
}
/**
* Note: `transactionRate` is not needed at this stage. It is only used
* at the `completeExchange` step
*/
const exchange = createExchange(transport, exchangeType, undefined, version);
const nonce = await exchange.startNewTransaction();
o.next({
type: "start-exchange-result",
startExchangeResult: { nonce, device },
});
});
};
startExchangeAsync().then(() => {
o.complete();
unsubscribed = true;
}, error => {
o.next({
type: "start-exchange-error",
startExchangeError: { error, device },
});
o.complete();
unsubscribed = true;
});
return () => {
unsubscribed = true;
};
});
};
// AppExchange Min version supporting NG types
const MIN_APP_EXCHANGE_NG = "3.3.0";
/**
* If the App-Exchnage version is not high enough, "NG" type can't worked
*/
function checkNgPrerequisite(exchangeType, appVersion) {
if (isExchangeTypeNg(exchangeType) && appVersion && semver.lt(appVersion, MIN_APP_EXCHANGE_NG)) {
return false;
}
return true;
}
export default startExchange;
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