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feat(ios): hashcash in swift (#8602)
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107 changes: 107 additions & 0 deletions
107
packages/frontend/apps/ios/App/App/plugins/Cookie/HashcashPlugin.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| import Capacitor | ||
| import CryptoSwift | ||
|
|
||
| @objc(HashcashPlugin) | ||
| public class HashcashPlugin: CAPPlugin, CAPBridgedPlugin { | ||
| public let identifier = "HashcashPlugin" | ||
| public let jsName = "Hashcash" | ||
| public let pluginMethods: [CAPPluginMethod] = [ | ||
| CAPPluginMethod(name: "hash", returnType: CAPPluginReturnPromise) | ||
| ] | ||
|
|
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| @objc func hash(_ call: CAPPluginCall) { | ||
| DispatchQueue.global(qos: .default).async { | ||
| let challenge = call.getString("challenge") ?? "" | ||
| let bits = call.getInt("bits") ?? 20; | ||
| call.resolve(["value": Stamp.mint(resource: challenge, bits: UInt32(bits)).format()]) | ||
| } | ||
| } | ||
| } | ||
|
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| let SALT_LENGTH = 16 | ||
|
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| struct Stamp { | ||
| let version: String | ||
| let claim: UInt32 | ||
| let ts: String | ||
| let resource: String | ||
| let ext: String | ||
| let rand: String | ||
| let counter: String | ||
|
|
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| func checkExpiration() -> Bool { | ||
| let dateFormatter = DateFormatter() | ||
| dateFormatter.dateFormat = "yyyyMMddHHmmss" | ||
| guard let date = dateFormatter.date(from: ts) else { return false } | ||
| return Date().addingTimeInterval(5 * 60) <= date | ||
| } | ||
|
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| func check(bits: UInt32, resource: String) -> Bool { | ||
| if version == "1" && bits <= claim && checkExpiration() && self.resource == resource { | ||
| let hexDigits = Int(floor(Float(claim) / 4.0)) | ||
|
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| // Check challenge | ||
| let formatted = format() | ||
| let result = formatted.data(using: .utf8)!.sha3(.sha256).compactMap { String(format: "%02x", $0) }.joined() | ||
| return result.prefix(hexDigits) == String(repeating: "0", count: hexDigits) | ||
| } else { | ||
| return false | ||
| } | ||
| } | ||
|
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| func format() -> String { | ||
| return "\(version):\(claim):\(ts):\(resource):\(ext):\(rand):\(counter)" | ||
| } | ||
|
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| static func mint(resource: String, bits: UInt32? = nil) -> Stamp { | ||
| let version = "1" | ||
| let now = Date() | ||
| let dateFormatter = DateFormatter() | ||
| dateFormatter.dateFormat = "yyyyMMddHHmmss" | ||
| let ts = dateFormatter.string(from: now) | ||
| let bits = bits ?? 20 | ||
| let rand = String((0..<SALT_LENGTH).map { _ in "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".randomElement()! }) | ||
| let challenge = "\(version):\(bits):\(ts):\(resource)::\(rand)" | ||
|
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| let hexDigits = Int(ceil(Float(bits) / 4.0)) | ||
| let zeros = String(repeating: "0", count: hexDigits) | ||
| var counter = 0 | ||
| var counterHex = "" | ||
| var hasher = SHA3(variant: .sha256) | ||
|
|
||
| while true { | ||
| let toHash = "\(challenge):\(String(format: "%x", counter))" | ||
| let hashed = try! hasher.finish(withBytes: toHash.data(using: .utf8)!.bytes) | ||
| let result = hashed.compactMap { String(format: "%02x", $0) }.joined() | ||
|
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| if result.prefix(hexDigits) == zeros { | ||
| counterHex = String(format: "%x", counter) | ||
| break | ||
| } | ||
| counter += 1 | ||
| } | ||
|
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| return Stamp(version: version, claim: bits, ts: ts, resource: resource, ext: "", rand: rand, counter: counterHex) | ||
| } | ||
| } | ||
|
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| extension Stamp { | ||
| init?(from string: String) throws { | ||
| let parts = string.split(separator: ":") | ||
| guard parts.count == 7 else { | ||
| throw NSError(domain: "StampError", code: 0, userInfo: [NSLocalizedDescriptionKey: "Malformed stamp, expected 7 parts, got \(parts.count)"]) | ||
| } | ||
|
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| guard let claim = UInt32(parts[1]) else { | ||
| throw NSError(domain: "StampError", code: 1, userInfo: [NSLocalizedDescriptionKey: "Malformed stamp"]) | ||
| } | ||
|
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| self.version = String(parts[0]) | ||
| self.claim = claim | ||
| self.ts = String(parts[2]) | ||
| self.resource = String(parts[3]) | ||
| self.ext = String(parts[4]) | ||
| self.rand = String(parts[5]) | ||
| self.counter = String(parts[6]) | ||
| } | ||
| } |
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6 changes: 6 additions & 0 deletions
6
packages/frontend/apps/ios/src/plugins/hashcash/definitions.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| export interface HashcashPlugin { | ||
| hash(options: { | ||
| challenge: string; | ||
| bits?: number; | ||
| }): Promise<{ value: string }>; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| import { registerPlugin } from '@capacitor/core'; | ||
|
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| import type { HashcashPlugin } from './definitions'; | ||
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| const Hashcash = registerPlugin<HashcashPlugin>('Hashcash'); | ||
|
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| export * from './definitions'; | ||
| export { Hashcash }; |
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