saepenatus/packages/core/node_modules/@ethersproject/providers/src.ts/web3-provider.ts

Web3-Onboard makes it simple to connect Ethereum hardware and software wallets to your dapp. Features standardised spec compliant web3 providers for all supported wallets, framework agnostic modern javascript UI with code splitting, CSS customization, mul

"use strict";

import { Networkish } from "@ethersproject/networks";
import { deepCopy, defineReadOnly } from "@ethersproject/properties";

import { Logger } from "@ethersproject/logger";
import { version } from "./_version";
const logger = new Logger(version);

import { JsonRpcProvider } from "./json-rpc-provider";

// Exported Types
export type ExternalProvider = {
    isMetaMask?: boolean;
    isStatus?: boolean;
    host?: string;
    path?: string;
    sendAsync?: (request: { method: string, params?: Array<any> }, callback: (error: any, response: any) => void) => void
    send?: (request: { method: string, params?: Array<any> }, callback: (error: any, response: any) => void) => void
    request?: (request: { method: string, params?: Array<any> }) => Promise<any>
}

let _nextId = 1;

export type JsonRpcFetchFunc = (method: string, params?: Array<any>) => Promise<any>;

type Web3LegacySend = (request: any, callback: (error: Error, response: any) => void) => void;

function buildWeb3LegacyFetcher(provider: ExternalProvider, sendFunc: Web3LegacySend) : JsonRpcFetchFunc {
    const fetcher = "Web3LegacyFetcher";

    return function(method: string, params: Array<any>): Promise<any> {
        const request = {
            method: method,
            params: params,
            id: (_nextId++),
            jsonrpc: "2.0"
        };

        return new Promise((resolve, reject) => {
            this.emit("debug", {
                action: "request",
                fetcher,
                request: deepCopy(request),
                provider: this
            });

            sendFunc(request, (error, response) => {

                if (error) {
                    this.emit("debug", {
                        action: "response",
                        fetcher,
                        error,
                        request,
                        provider: this
                    });

                    return reject(error);
                }

                this.emit("debug", {
                    action: "response",
                    fetcher,
                    request,
                    response,
                    provider: this
                });

                if (response.error) {
                    const error = new Error(response.error.message);
                    (<any>error).code = response.error.code;
                    (<any>error).data = response.error.data;
                    return reject(error);
                }

                resolve(response.result);
            });
        });
    }
}

function buildEip1193Fetcher(provider: ExternalProvider): JsonRpcFetchFunc {
    return function(method: string, params: Array<any>): Promise<any> {
        if (params == null) { params = [ ]; }

        const request = { method, params };

        this.emit("debug", {
            action: "request",
            fetcher: "Eip1193Fetcher",
            request: deepCopy(request),
            provider: this
        });

        return provider.request(request).then((response) => {
            this.emit("debug", {
                action: "response",
                fetcher: "Eip1193Fetcher",
                request,
                response,
                provider: this
            });

            return response;

        }, (error) => {
            this.emit("debug", {
                action: "response",
                fetcher: "Eip1193Fetcher",
                request,
                error,
                provider: this
            });

            throw error;
        });
    }
}

export class Web3Provider extends JsonRpcProvider {
    readonly provider: ExternalProvider;
    readonly jsonRpcFetchFunc: JsonRpcFetchFunc;

    constructor(provider: ExternalProvider | JsonRpcFetchFunc, network?: Networkish) {
        logger.checkNew(new.target, Web3Provider);

        if (provider == null) {
            logger.throwArgumentError("missing provider", "provider", provider);
        }

        let path: string = null;
        let jsonRpcFetchFunc: JsonRpcFetchFunc = null;
        let subprovider: ExternalProvider = null;

        if (typeof(provider) === "function") {
            path = "unknown:";
            jsonRpcFetchFunc = provider;

        } else {
            path = provider.host || provider.path || "";
            if (!path && provider.isMetaMask) {
                path = "metamask";
            }

            subprovider = provider;

            if (provider.request) {
                if (path === "") { path = "eip-1193:"; }
                jsonRpcFetchFunc = buildEip1193Fetcher(provider);
            } else if (provider.sendAsync) {
                jsonRpcFetchFunc = buildWeb3LegacyFetcher(provider, provider.sendAsync.bind(provider));
            } else if (provider.send) {
                jsonRpcFetchFunc = buildWeb3LegacyFetcher(provider, provider.send.bind(provider));
            } else {
                logger.throwArgumentError("unsupported provider", "provider", provider);
            }

            if (!path) { path = "unknown:"; }
        }

        super(path, network);

        defineReadOnly(this, "jsonRpcFetchFunc", jsonRpcFetchFunc);
        defineReadOnly(this, "provider", subprovider);
    }

    send(method: string, params: Array<any>): Promise<any> {
        return this.jsonRpcFetchFunc(method, params);
    }
}