is it possible to make ethers.js as a window.ethereum injected provider ?

[sandys]

hi guys,
is it possible to make an injected provider from ethers.js - the same way metamask does it ?
window.ethereum = new ethers.providers.Web3Provider(new ethers.providers.JsonRpcProvider('https://rinkeby.infura.io'))

is this sufficient ?

because when im injecting this into pancakeswap website, im constantly getting the event wallet_addethereumchain . I'm not sure if this is what all the dapps expect in terms of an object.

I tried a bunch of different iterations, but i thought it would best to ask here.

should window.ethereum be set as a jsonrpcprovider ...or as a web3provider ?

[ricmoo]

Heya!

The injected provider is actually neither, it is a standard known as EIP-1193.

You can convert a Provider and optionally a Signer into an EIP-1193-compatible object using the Eip1193Bridge. It is still experimental, but should suffice for most purposes.

But you may not be able to "just inject" an object into window. I'm not sure about the inner workings of MetaMask, but they may mark the object a not-writable, so replacing it won't work. Also replacing it means existing connections may be lost.

So it really depends a lot on what you are trying to do with it.

[sandys]

hi - thanks for replying!
so we are not overriding metamask. I was trying to give an analogy of "like metamask". however we are indeed creating our own browser extension.

Thanks for mentioning EIP1193Bridge - i definitely did not know!! and i definitely did not know that it had to be inherited from the EventEmitter api.
is there a minimal example of this somewhere ? in case there are tests/poc etc of this api.

It seemed to me that even metamask was doing this basis window.ethereum (https://github.com/MetaMask/mobile-provider/blob/main/src/inpage/index.js#L69), which is why i thought it was this way.

[ricmoo]

I don’t know what shimWeb3 is, but my guess is that it adds .send and .sendAsync to handle legacy apps, by transforming legacy requests to those methods into the EIP-1193 .request.

I don’t have any examples off the top of my head other than the docs.

[DanGeorge35]

I am having the same problem with the window.ethereum. Have you found any solution, please??

[ricmoo]

Stressed about what? The window.ethereum is added by MetaMask and adheres to a low-level standard. Wrapping it in a Web3Provider exposes it with a higher level API. :)