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const ObservableStore = require('obs-store')
const extension = require('extensionizer')
/**
* A controller that services user-approved requests for a full Ethereum provider API
*/
class ProviderApprovalController {
/**
* Creates a ProviderApprovalController
*
* @param {Object} [config] - Options to configure controller
*/
constructor ({ closePopup, openPopup, platform, publicConfigStore } = {}) {
this.store = new ObservableStore()
this.closePopup = closePopup
this.openPopup = openPopup
this.platform = platform
this.publicConfigStore = publicConfigStore
this.approvedOrigins = {}
platform && platform.addMessageListener && platform.addMessageListener(({ action, origin }) => {
if (!action) { return }
switch (action) {
case 'init-provider-request':
this.handleProviderRequest(origin)
break
case 'provider-status-request':
this.handleProviderStatusRequest(origin)
break
}
})
}
/**
* Called when a tab requests access to a full Ethereum provider API
*
* @param {string} origin - Origin of the window requesting full provider access
*/
async handleProviderRequest (origin) {
this.store.updateState({ providerRequests: [{ origin }] })
if (await this.isApproved(origin)) {
this.approveProviderRequest(origin)
return
}
this.openPopup && this.openPopup()
}
/**
* Called by a tab to detemrine if a full Ethereum provider API is exposed
*
* @param {string} origin - Origin of the window requesting provider status
*/
async handleProviderStatusRequest (origin) {
const isEnabled = await this.isApproved(origin)
this.platform && this.platform.sendMessage({ action: 'provider-status', isEnabled }, { active: true })
}
/**
* Called when a user approves access to a full Ethereum provider API
*
* @param {string} origin - Origin of the target window to approve provider access
*/
approveProviderRequest (origin) {
this.closePopup && this.closePopup()
const requests = this.store.getState().providerRequests || []
this.platform && this.platform.sendMessage({ action: 'approve-provider-request' }, { active: true })
this.publicConfigStore.emit('update', this.publicConfigStore.getState())
const providerRequests = requests.filter(request => request.origin !== origin)
this.store.updateState({ providerRequests })
this.approvedOrigins[origin] = true
}
/**
* Called when a tab rejects access to a full Ethereum provider API
*
* @param {string} origin - Origin of the target window to reject provider access
*/
rejectProviderRequest (origin) {
this.closePopup && this.closePopup()
const requests = this.store.getState().providerRequests || []
this.platform && this.platform.sendMessage({ action: 'reject-provider-request' }, { active: true })
const providerRequests = requests.filter(request => request.origin !== origin)
this.store.updateState({ providerRequests })
}
/**
* Clears any cached approvals for user-approved origins
*/
clearApprovedOrigins () {
this.approvedOrigins = {}
extension.storage.local.set({ forcedOrigins: [] })
}
/**
* Determines if a given origin has been approved
*
* @param {string} origin - Domain origin to check for approval status
* @returns {boolean} - True if the origin has been approved
*/
isApproved (origin) {
return new Promise(resolve => {
extension.storage.local.get(['forcedOrigins'], ({ forcedOrigins = [] }) => {
resolve(this.approvedOrigins[origin] || forcedOrigins.indexOf(origin) > -1)
})
})
}
/**
* Called when a user forces the exposure of a full Ethereum provider API
*/
forceInjection () {
this.platform.sendMessage({ action: 'force-injection' }, { active: true })
}
}
module.exports = ProviderApprovalController
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