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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| import { | ||
| ChallengeResponse, | ||
| Data, | ||
| ErrorResponse, | ||
| SettingsResponse, | ||
| TransferResponse, | ||
| } from "./types"; | ||
|
|
||
| enum Endpoint { | ||
| Settings = "/setting", | ||
| Challenge = "/challenge", | ||
| Transfer = "", | ||
| } | ||
|
|
||
| export class API { | ||
| constructor(protected readonly url: string) {} | ||
|
|
||
| /** | ||
| * Wrapper for fetch requests to handle ReadableStream response when errors are received from API | ||
| * | ||
| * @param {string} endpoint | ||
| * @param {RequestInit} options | ||
| * | ||
| * @returns Object | ||
| */ | ||
| async request<T = unknown>( | ||
| endpoint: string, | ||
| options: RequestInit = { method: "GET" } | ||
| ): Promise<T> { | ||
| return await fetch(new URL(`${this.url}${endpoint}`), { | ||
| ...options, | ||
| }) | ||
| .then((response) => { | ||
| if (response.ok) { | ||
| return response.json(); | ||
| } | ||
| const reader = response?.body?.getReader(); | ||
| const errors = reader | ||
| ?.read() | ||
| .then( | ||
| (data): Promise<ErrorResponse> => | ||
| Promise.reject(JSON.parse(new TextDecoder().decode(data.value))) | ||
| ); | ||
| if (!errors) { | ||
| throw new Error("Unable to parse error response"); | ||
| } | ||
| return errors; | ||
| }) | ||
| .catch((e) => { | ||
| console.error(e); | ||
| return Promise.reject(e); | ||
| }); | ||
| } | ||
|
|
||
| /** | ||
| * Request faucet settings | ||
| * | ||
| * @returns Object | ||
| */ | ||
| async settings(): Promise<SettingsResponse> { | ||
| return this.request(Endpoint.Settings); | ||
| } | ||
|
|
||
| /** | ||
| * Request challenge from endpoint url | ||
| * | ||
| * @param {string} publicKey | ||
| * @returns Object | ||
| */ | ||
| async challenge(publicKey: string): Promise<ChallengeResponse> { | ||
| return this.request(`${Endpoint.Challenge}/${publicKey}`); | ||
| } | ||
|
|
||
| /** | ||
| * Submit a transfer request | ||
| * | ||
| * @param {Data} data | ||
| * @returns {Object} | ||
| */ | ||
| async submitTransfer(data: Data): Promise<TransferResponse> { | ||
| return this.request(Endpoint.Transfer, { | ||
| method: "POST", | ||
| body: JSON.stringify(data), | ||
| headers: { | ||
| "Content-Type": "application/json", | ||
| }, | ||
| }); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,154 +1,3 @@ | ||
| import { fromHex, toHex } from "@cosmjs/encoding"; | ||
| import { sha256 } from "node-forge"; | ||
| import { | ||
| ChallengeResponse, | ||
| Data, | ||
| SettingsResponse, | ||
| TransferResponse, | ||
| } from "./types"; | ||
| /** | ||
| * Wrapper for fetch requests to handle ReadableStream response when errors are received from API | ||
| */ | ||
| export async function request<T = unknown>( | ||
| url: string, | ||
| options: RequestInit = { method: "GET" } | ||
| ): Promise<T> { | ||
| return (await fetch(new URL(url), { | ||
| ...options, | ||
| }) | ||
| .then((response) => { | ||
| if (response.ok) { | ||
| return response.json(); | ||
| } | ||
| const reader = response?.body?.getReader(); | ||
| return reader | ||
| ?.read() | ||
| .then((data) => | ||
| Promise.reject(JSON.parse(new TextDecoder().decode(data.value))) | ||
| ); | ||
| }) | ||
| .catch((e) => { | ||
| console.error(e); | ||
| return Promise.reject(e); | ||
| })) as T; | ||
| } | ||
|
|
||
| /** | ||
| * Request faucet settings | ||
| */ | ||
| export const requestSettings = async ( | ||
| url: string | ||
| ): Promise<SettingsResponse> => { | ||
| return request(`${url}/setting`); | ||
| }; | ||
|
|
||
| /** | ||
| * Request challenge from endpoint url | ||
| * | ||
| * @param {string} url | ||
| * @returns Object | ||
| */ | ||
| export const requestChallenge = async ( | ||
| url: string, | ||
| publicKey: string | ||
| ): Promise<ChallengeResponse> => { | ||
| return request(`${url}/challenge/${publicKey}`); | ||
| }; | ||
|
|
||
| /** | ||
| * Submit a transfer request | ||
| * | ||
| * @param {string} url | ||
| * @param {Data} data | ||
| * @returns {Object} | ||
| */ | ||
| export const requestTransfer = async ( | ||
| url: string, | ||
| data: Data | ||
| ): Promise<TransferResponse> => { | ||
| return request(url, { | ||
| method: "POST", | ||
| body: JSON.stringify(data), | ||
| headers: { | ||
| "Content-Type": "application/json", | ||
| }, | ||
| }); | ||
| }; | ||
|
|
||
| /** | ||
| * Validate solution | ||
| * | ||
| * @param {Uint8Array} solution | ||
| * @param {number} difficulty | ||
| * @returns {boolean} | ||
| */ | ||
| export const isValidPow = ( | ||
| solution: Uint8Array, | ||
| difficulty: number | ||
| ): boolean => { | ||
| for (let i = 0; i < difficulty; i++) { | ||
| if (solution[i] !== 0) { | ||
| return false; | ||
| } | ||
| } | ||
| return true; | ||
| }; | ||
|
|
||
| /** | ||
| * Provided an integer, convert to bytes and pad | ||
| * | ||
| * @param {number} int | ||
| * @returns {Uint8Array} | ||
| */ | ||
| export const getSolutionBytes = (int: number): Uint8Array => { | ||
| const buffer = new ArrayBuffer(64); | ||
| const view = new DataView(buffer, 60, 4); | ||
| view.setInt32(0, int, false); | ||
|
|
||
| // Return solution byte array | ||
| return new Uint8Array(buffer); | ||
| }; | ||
|
|
||
| /** | ||
| * Compute proof of work solution | ||
| * | ||
| * @param {string} challenge | ||
| * @param {number} difficulty | ||
| * @returns {Uint8Array} | ||
| */ | ||
| export const computePowSolution = ( | ||
| challenge: string, | ||
| difficulty: number | ||
| ): string => { | ||
| let i = 0; | ||
| let solution: string = ""; | ||
|
|
||
| while (i >= 0) { | ||
| const solutionBytes = getSolutionBytes(i); | ||
|
|
||
| const solutionByteString = String.fromCharCode.apply(null, [ | ||
| ...solutionBytes, | ||
| ]); | ||
| const challengeByteString = String.fromCharCode.apply(null, [ | ||
| ...fromHex(challenge), | ||
| ]); | ||
|
|
||
| const hasher = sha256.create(); | ||
| hasher.update(challengeByteString); | ||
| hasher.update(solutionByteString); | ||
|
|
||
| const digestHex = hasher.digest().toHex(); | ||
| const hash = fromHex(digestHex); | ||
| const isValid = isValidPow(hash, difficulty); | ||
|
|
||
| if (isValid) { | ||
| solution = toHex(solutionBytes); | ||
| break; | ||
| } | ||
|
|
||
| i += 1; | ||
| } | ||
| return solution; | ||
| }; | ||
|
|
||
| export * from "./api"; | ||
| export * from "./pow"; | ||
| export * from "./types"; |
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