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this prevents the need for 'unsafe-inline' in the CSP to talk to MM on Firefox
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| declare module 'metamask-inpage-provider' { | ||
| import type PostMessageStream from 'post-message-stream' | ||
|
|
||
| export function initProvider({ | ||
| connectionStream, | ||
| maxEventListeners = 100, | ||
| preventPropertyDeletion = true, | ||
| shouldSendMetadata = true, | ||
| shouldSetOnWindow = true | ||
| }: { | ||
| connectionStream: PostMessageStream | ||
| maxEventListeners?: number | ||
| preventPropertyDeletion?: boolean | ||
| shouldSendMetadata?: boolean | ||
| shouldSetOnWindow?: boolean | ||
| }): unknown | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| /// <reference path="./metamaskInpageProvider.d.ts" /> | ||
|
|
||
| import { initProvider } from 'metamask-inpage-provider' | ||
| import PostMessageStream from 'post-message-stream' | ||
|
|
||
| function universalProxy(pseudoTarget: object) { | ||
| return { | ||
| proxy: new Proxy( | ||
| {}, | ||
| new Proxy( | ||
| {}, | ||
| { | ||
| get(_, p) { | ||
| return (_t: any, p2: any, r: any) => { | ||
| switch (p) { | ||
| case 'get': { | ||
| const out = Reflect.get(pseudoTarget, p2, r) | ||
| if (typeof out === 'function') return out.bind(pseudoTarget) | ||
| return out | ||
| } | ||
| case 'getOwnPropertyDescriptor': { | ||
| const out = Reflect.getOwnPropertyDescriptor(pseudoTarget, p2) | ||
| if (out) out.configurable = true | ||
| return out | ||
| } | ||
| case 'isExtensible': | ||
| return true | ||
| case 'preventExtensions': | ||
| return false | ||
| default: | ||
| return (Reflect as any)[p](pseudoTarget, p2, r) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| ) | ||
| ), | ||
| getPseudoTarget() { | ||
| return pseudoTarget | ||
| }, | ||
| setPseudoTarget(value: object) { | ||
| pseudoTarget = value | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if (typeof window !== 'undefined') { | ||
| const initialPseudoTarget = Object.freeze({}) | ||
| const { proxy, getPseudoTarget, setPseudoTarget } = universalProxy( | ||
| window.ethereum ?? initialPseudoTarget | ||
| ) | ||
| try { | ||
| Object.defineProperty(window, 'ethereum', { | ||
| configurable: true, | ||
| enumerable: true, | ||
| get() { | ||
| return proxy | ||
| }, | ||
| set(value: unknown) { | ||
| if (!(value && ['object', 'function'].includes(typeof value))) throw new TypeError() | ||
| setPseudoTarget(value as object) | ||
| } | ||
| }) | ||
|
|
||
| // Allow MM time to try to sucessfully execute its own injected stub | ||
| setTimeout(() => { | ||
| try { | ||
| // Don't clobber an existing MM stub | ||
| if (getPseudoTarget() !== initialPseudoTarget) { | ||
| console.info('metamaskInpageProvider: MM stub was already injected') | ||
| return | ||
| } | ||
| initProvider({ | ||
| connectionStream: new PostMessageStream({ | ||
| name: 'inpage', | ||
| target: 'contentscript' | ||
| }) | ||
| }) | ||
| if (window.ethereum.isMetaMask) { | ||
| console.info('metamaskInpageProvider: injected MM stub') | ||
| } else { | ||
| console.info( | ||
| 'metamaskInpageProvider: MM stub injection failed:', | ||
| window.ethereum, | ||
| getPseudoTarget() | ||
| ) | ||
| } | ||
| } catch (e) { | ||
| console.error('metamaskInpageProvider callback:', e) | ||
| } finally { | ||
| Object.defineProperty(window, 'ethereum', { | ||
| configurable: true, | ||
| enumerable: true, | ||
| writable: true, | ||
| value: getPseudoTarget() | ||
| }) | ||
| console.info('metamaskInpageProvider: window.ethereum proxy reset') | ||
| } | ||
| }, 0) | ||
| } catch (e) { | ||
| console.error('metamaskInpageProvider:', e) | ||
| } | ||
| } |
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