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// Copyright (C) 2023 Vaughn Nugent
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
import { isEqual, isNil, isEmpty } from 'lodash'
import { apiCall } from '@vnuge/vnlib.browser'
import { Store, storeToRefs } from 'pinia'
import { useScriptTag, watchOnce } from "@vueuse/core"
import { useStore } from '../store'
export type PromptHandler = (request: UserPermissionRequest) => Promise<boolean>
export interface UserPermissionRequest {
type: string
msg: string
origin: string
data: any
}
const _promptHandler = (() => {
let _handler: PromptHandler | undefined = undefined;
return {
invoke(event:UserPermissionRequest){
if (!_handler) {
throw new Error('No prompt handler set')
}
return _handler(event)
},
set(handler: PromptHandler) {
_handler = handler
}
}
})()
const registerWindowHandler = (store: Store, extName: string) => {
const { selectedKey } = storeToRefs(store)
const { nostr } = store.plugins;
const onAsyncCall = async ({ source, data, origin } : MessageEvent<any>) => {
//clean any junk/methods with json parse/stringify
data = JSON.parse(JSON.stringify(data))
const requestPermission = async (cb: (...args: any) => Promise<any>) => {
//await propmt for user to allow the request
const allow = await _promptHandler.invoke({ ...data, origin })
//send request to background
return allow ? await cb() : { error: 'User denied permission' }
}
//Confirm the message format is correct
if (!isEqual(source, window) || isEmpty(data) || isNil(data.type)) {
return
}
//Confirm extension is for us
if (!isEqual(data.ext, extName)) {
return
}
switch (data.type) {
case 'getPublicKey':
return requestPermission(async () => selectedKey.value?.PublicKey);
case 'signEvent':
return requestPermission(async () => {
const event = data.payload.event
return await nostr.signEvent({
...event,
KeyId: selectedKey.value!.Id,
pubkey: selectedKey.value!.PublicKey
});
})
//Check the public key against selected key
case 'getRelays':
return requestPermission(async () => await nostr.getRelays())
case 'nip04.encrypt':
return requestPermission(async () => {
return await nostr.nip04Encrypt({
pubkey: data.payload.peer,
content: data.payload.plaintext,
//Set selected key id as our desired encryption key
KeyId: selectedKey.value!.Id
})
})
case 'nip04.decrypt':
return requestPermission(async () => {
const result = await apiCall(async () => {
return await nostr.nip04Decrypt({
pubkey: data.payload.peer,
content: data.payload.ciphertext,
//Set selected key id as our desired decryption key
KeyId: selectedKey.value!.Id
})
})
return isNil(result) ? 'Error: Failed to decrypt message' : result
})
}
}
//Only listen for messages if injection is enabled
window.addEventListener('message', async (args) => {
//Wrap in apicall to display errors
await apiCall(async () => {
let response;
try{
response = await onAsyncCall(args)
}
catch(e: any){
const error = JSON.stringify(e)
response = { error }
//rethrow for logging
throw e;
}
finally{
// always return response message, must have the same id as the request
window.postMessage({ ext: extName, id: args.data.id, response }, origin);
}
})
});
}
export const usePrompt = (callback: PromptHandler) => _promptHandler.set(callback);
export const onLoad = async (extName: string, scriptUrl: string) => {
const store = useStore()
const { isTabAllowed } = storeToRefs(store)
const injectHandler = () => {
//inject the nostr provider script into the page
useScriptTag(scriptUrl, undefined, { manual: false, defer: true })
//Regsiter listener for messages from the injected script
registerWindowHandler(store, extName)
}
//Make sure the origin is allowed
if (isTabAllowed.value === false) {
//If not allowed yet, wait for the store to update
watchOnce(isTabAllowed, val => val ? injectHandler() : undefined);
}
else {
injectHandler();
}
}
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