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namingService.ts
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namingService.ts
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import {
NamingServiceSource,
SourceDefinition,
NetworkIdMap,
BlockhanNetworkUrlMap,
ResolutionResponse,
} from './types';
import { hash } from 'eth-ens-namehash';
import ResolutionError, { ResolutionErrorCode } from './resolutionError';
import BaseConnection from './baseConnection';
import { invert } from './utils';
import Contract from './utils/contract';
/**
* Abstract class for different Naming Service supports like
* - ENS
* - ZNS
*
*/
export default abstract class NamingService extends BaseConnection {
readonly name: string;
abstract isSupportedDomain(domain: string): boolean;
abstract isSupportedNetwork(): boolean;
abstract namehash(domain: string): string;
abstract address(domain: string, currencyTicker: string): Promise<string>;
abstract owner(domain: string): Promise<string>;
abstract record(domain: string, key: string): Promise<string>;
abstract resolve(domain: string): Promise<ResolutionResponse>;
serviceName(domain: string): string {
return this.name;
}
protected abstract normalizeSource(
source: NamingServiceSource,
): SourceDefinition;
protected ensureSupportedDomain(domain: string): void {
if (!this.isSupportedDomain(domain)) {
throw new ResolutionError(ResolutionErrorCode.UnsupportedDomain, {
domain,
});
}
}
}
export abstract class EtheriumNamingService extends NamingService {
abstract registryAddress?: string;
abstract url: string;
protected registryContract: Contract;
/** @internal */
readonly NetworkIdMap: NetworkIdMap = {
1: 'mainnet',
3: 'ropsten',
4: 'kovan',
42: 'rinkeby',
5: 'goerli',
};
readonly UrlMap: BlockhanNetworkUrlMap = {
mainnet: 'https://mainnet.infura.io',
ropsten: 'https://ropsten.infura.io',
kovan: 'https://kovan.infura.io',
rinkeby: 'https://rinkeby.infura.io',
goerli: 'https://goerli.infura.io',
};
readonly NetworkNameMap = invert(this.NetworkIdMap);
/**
* Look up for network from url provided
* @param url - main api url for blockchain
* @returns Network such as:
* - mainnet
* - testnet
*/
private networkFromUrl(url: string): string {
for (const key in this.NetworkNameMap) {
if (!this.NetworkNameMap.hasOwnProperty(key)) continue;
if (url.indexOf(key) >= 0) return key;
}
}
/**
* Normalizes the source object based on type
* @internal
* @param source
* @returns
*/
protected normalizeSource(source: NamingServiceSource): SourceDefinition {
switch (typeof source) {
case 'boolean': {
return {
url: this.UrlMap['mainnet'],
network: this.networkFromUrl(this.UrlMap['mainnet']),
};
}
case 'string': {
return {
url: source as string,
network: this.networkFromUrl(source as string),
};
}
case 'object': {
source = { ...source };
if (typeof source.network == 'number') {
source.network = this.NetworkIdMap[source.network];
}
if (source.registry) {
source.network = source.network ? source.network : 'mainnet';
source.url = source.url
? source.url
: `https://${source.network}.infura.io`;
}
if (
source.network &&
!source.url &&
this.NetworkNameMap.hasOwnProperty(source.network)
) {
source.url = `https://${source.network}.infura.io`;
}
if (source.url && !source.network) {
source.network = this.networkFromUrl(source.url);
}
return source;
}
}
}
/**
* Produces ENS namehash
* @param domain - domain to be hashed
* @return ENS namehash of a domain
*/
namehash(domain: string): string {
this.ensureSupportedDomain(domain);
return hash(domain);
}
/**
* Checks if the current network is supported
* @returns
*/
isSupportedNetwork(): boolean {
return this.registryAddress != null;
}
/**
* Internal wrapper for ens method. Used to throw an error when ens is down
* @param method - method to be called
* @throws ResolutionError -> When blockchain is down
*/
protected async callMethod(
contract: Contract,
methodname: string,
params: any,
): Promise<any> {
try {
return await contract.fetchMethod(methodname, params);
} catch (error) {
const { message }: { message: string } = error;
if (
message.match(/Invalid JSON RPC response/) ||
message.match(/legacy access request rate exceeded/)
) {
throw new ResolutionError(ResolutionErrorCode.NamingServiceDown, {
method: this.name,
});
}
throw error;
}
}
protected buildContract(abi, address) {
return new Contract(this.name, this.url, abi, address)
}
}