blockstack
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The Blockstack Javascript library for authentication, identity, and storage.
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<a href="../../index.html">All files</a> / <a href="index.html">src/auth</a> protocolLaunch.ts
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<span class="strong">3.85% </span>
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<span class='fraction'>3/78</span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import { getGlobalObjects, BLOCKSTACK_HANDLER } from '../utils'
import { Logger } from '../logger'
/**
* Detects if the native auth-browser is installed and is successfully
* launched via a custom protocol URI.
* @param {String} authRequest
* The encoded authRequest to be used as a query param in the custom URI.
* @param {String} successCallback
* The callback that is invoked when the protocol handler was detected.
* @param {String} failCallback
* The callback that is invoked when the protocol handler was not detected.
* @return {void}
*/
export function <span class="fstat-no" title="function not covered" >launchCustomProtocol(</span>
authRequest: string,
successCallback: () => void,
failCallback: () => void) {
// Create a unique ID used for this protocol detection attempt.
const echoReplyID = <span class="cstat-no" title="statement not covered" >Math.random().toString(36).substr(2, 9)</span>
const echoReplyKeyPrefix = <span class="cstat-no" title="statement not covered" >'echo-reply-'</span>
const echoReplyKey = <span class="cstat-no" title="statement not covered" >`${echoReplyKeyPrefix}${echoReplyID}`</span>
const {
localStorage, document,
setTimeout, clearTimeout,
addEventListener, removeEventListener
} = <span class="cstat-no" title="statement not covered" >getGlobalObjects(</span>
['localStorage', 'document', 'setTimeout', 'clearTimeout', 'addEventListener', 'removeEventListener'],
{ throwIfUnavailable: true, usageDesc: 'detectProtocolLaunch' }
)
// Use localStorage as a reliable cross-window communication method.
// Create the storage entry to signal a protocol detection attempt for the
// next browser window to check.
<span class="cstat-no" title="statement not covered" > localStorage.setItem(echoReplyKey, Date.now().toString())</span>
const cleanUpLocalStorage = <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >() =</span>> {</span>
try {
<span class="cstat-no" title="statement not covered" > localStorage.removeItem(echoReplyKey)</span>
// Also clear out any stale echo-reply keys older than 1 hour.
for (let i = <span class="cstat-no" title="statement not covered" >0;</span> i < localStorage.length; i++) {
const storageKey = <span class="cstat-no" title="statement not covered" >localStorage.key(i)</span>
if (storageKey && storageKey.startsWith(echoReplyKeyPrefix)) {
const storageValue = <span class="cstat-no" title="statement not covered" >localStorage.getItem(storageKey)</span>
if (storageValue === 'success' || (Date.now() - parseInt(storageValue, 10)) > 3600000) {
<span class="cstat-no" title="statement not covered" > localStorage.removeItem(storageKey)</span>
}
}
}
} catch (err) {
<span class="cstat-no" title="statement not covered" > Logger.error('Exception cleaning up echo-reply entries in localStorage')</span>
<span class="cstat-no" title="statement not covered" > Logger.error(err)</span>
}
}
const detectionTimeout = <span class="cstat-no" title="statement not covered" >1000</span>
let redirectToWebAuthTimer = <span class="cstat-no" title="statement not covered" >0</span>
const cancelWebAuthRedirectTimer = <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >() =</span>> {</span>
if (redirectToWebAuthTimer) {
<span class="cstat-no" title="statement not covered" > clearTimeout(redirectToWebAuthTimer)</span>
<span class="cstat-no" title="statement not covered" > redirectToWebAuthTimer = 0</span>
}
}
const startWebAuthRedirectTimer = <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >(t</span>imeout = <span class="branch-0 cbranch-no" title="branch not covered" >detectionTimeout)</span> => {</span>
<span class="cstat-no" title="statement not covered" > cancelWebAuthRedirectTimer()</span>
<span class="cstat-no" title="statement not covered" > redirectToWebAuthTimer = setTimeout(<span class="fstat-no" title="function not covered" >() =</span>> {</span>
if (redirectToWebAuthTimer) {
<span class="cstat-no" title="statement not covered" > cancelWebAuthRedirectTimer()</span>
let nextFunc: () => void
if (localStorage.getItem(echoReplyKey) === 'success') {
<span class="cstat-no" title="statement not covered" > Logger.info('Protocol echo reply detected.')</span>
<span class="cstat-no" title="statement not covered" > nextFunc = successCallback</span>
} else {
<span class="cstat-no" title="statement not covered" > Logger.info('Protocol handler not detected.')</span>
<span class="cstat-no" title="statement not covered" > nextFunc = failCallback</span>
}
<span class="cstat-no" title="statement not covered" > failCallback = <span class="fstat-no" title="function not covered" >() =</span>> {}</span>
<span class="cstat-no" title="statement not covered" > successCallback = <span class="fstat-no" title="function not covered" >() =</span>> {}</span>
<span class="cstat-no" title="statement not covered" > cleanUpLocalStorage()</span>
// Briefly wait since localStorage changes can
// sometimes be ignored when immediately redirected.
<span class="cstat-no" title="statement not covered" > setTimeout(<span class="fstat-no" title="function not covered" >() =</span>> <span class="cstat-no" title="statement not covered" >nextFunc(),</span> 100)</span>
}
}, timeout)
}
<span class="cstat-no" title="statement not covered" > startWebAuthRedirectTimer()</span>
const inputPromptTracker = <span class="cstat-no" title="statement not covered" >document.createElement('input')</span>
<span class="cstat-no" title="statement not covered" > inputPromptTracker.type = 'text'</span>
// Setting display:none on an element prevents them from being focused/blurred.
// So we hide using 0 width/height/opacity, and set position:fixed so that the
// page does not scroll when the element is focused.
const hiddenCssStyle = <span class="cstat-no" title="statement not covered" >'all: initial; position: fixed; top: 0; height: 0; width: 0; opacity: 0;'</span>
<span class="cstat-no" title="statement not covered" > inputPromptTracker.style.cssText = hiddenCssStyle</span>
// If the the focus of a page element is immediately changed then this likely indicates
// the protocol handler is installed, and the browser is prompting the user if they want
// to open the application.
const inputBlurredFunc = <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >() =</span>> {</span>
// Use a timeout of 100ms to ignore instant toggles between blur and focus.
// Browsers often perform an instant blur & focus when the protocol handler is working
// but not showing any browser prompts, so we want to ignore those instances.
let isRefocused = <span class="cstat-no" title="statement not covered" >false</span>
<span class="cstat-no" title="statement not covered" > inputPromptTracker.addEventListener('focus', <span class="fstat-no" title="function not covered" >() =</span>> { <span class="cstat-no" title="statement not covered" >isRefocused = true }</span>, { once: true, capture: true })</span>
<span class="cstat-no" title="statement not covered" > setTimeout(<span class="fstat-no" title="function not covered" >() =</span>> {</span>
if (redirectToWebAuthTimer && !isRefocused) {
<span class="cstat-no" title="statement not covered" > Logger.info('Detected possible browser prompt for opening the protocol handler app.')</span>
<span class="cstat-no" title="statement not covered" > clearTimeout(redirectToWebAuthTimer)</span>
<span class="cstat-no" title="statement not covered" > inputPromptTracker.addEventListener('focus', <span class="fstat-no" title="function not covered" >() =</span>> {</span>
if (redirectToWebAuthTimer) {
<span class="cstat-no" title="statement not covered" > Logger.info('Possible browser prompt closed, restarting auth redirect timeout.')</span>
<span class="cstat-no" title="statement not covered" > startWebAuthRedirectTimer()</span>
}
}, { once: true, capture: true })
}
}, 100)
}
<span class="cstat-no" title="statement not covered" > inputPromptTracker.addEventListener('blur', inputBlurredFunc, { once: true, capture: true })</span>
<span class="cstat-no" title="statement not covered" > setTimeout(<span class="fstat-no" title="function not covered" >() =</span>> <span class="cstat-no" title="statement not covered" >inputPromptTracker.removeEventListener('blur', inputBlurredFunc),</span> 200)</span>
<span class="cstat-no" title="statement not covered" > document.body.appendChild(inputPromptTracker)</span>
<span class="cstat-no" title="statement not covered" > inputPromptTracker.focus()</span>
// Detect if document.visibility is immediately changed which is a strong
// indication that the protocol handler is working. We don't know for sure and
// can't predict future browser changes, so only increase the redirect timeout.
// This reduces the probability of a false-negative (where local auth works, but
// the original page was redirect to web auth because something took too long),
const pageVisibilityChanged = <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >() =</span>> {</span>
if (document.hidden && redirectToWebAuthTimer) {
<span class="cstat-no" title="statement not covered" > Logger.info('Detected immediate page visibility change (protocol handler probably working).')</span>
<span class="cstat-no" title="statement not covered" > startWebAuthRedirectTimer(3000)</span>
}
}
<span class="cstat-no" title="statement not covered" > document.addEventListener('visibilitychange', pageVisibilityChanged, { once: true, capture: true })</span>
<span class="cstat-no" title="statement not covered" > setTimeout(<span class="fstat-no" title="function not covered" >() =</span>> <span class="cstat-no" title="statement not covered" >document.removeEventListener('visibilitychange', pageVisibilityChanged),</span> 500)</span>
// Listen for the custom protocol echo reply via localStorage update event.
<span class="cstat-no" title="statement not covered" > addEventListener('storage', function <span class="fstat-no" title="function not covered" >replyEventListener(</span>event) {</span>
if (event.key === echoReplyKey && localStorage.getItem(echoReplyKey) === 'success') {
// Custom protocol worked, cancel the web auth redirect timer.
<span class="cstat-no" title="statement not covered" > cancelWebAuthRedirectTimer()</span>
<span class="cstat-no" title="statement not covered" > inputPromptTracker.removeEventListener('blur', inputBlurredFunc)</span>
<span class="cstat-no" title="statement not covered" > Logger.info('Protocol echo reply detected from localStorage event.')</span>
// Clean up event listener and localStorage.
<span class="cstat-no" title="statement not covered" > removeEventListener('storage', replyEventListener)</span>
const nextFunc = <span class="cstat-no" title="statement not covered" >successCallback</span>
<span class="cstat-no" title="statement not covered" > successCallback = <span class="fstat-no" title="function not covered" >() =</span>> {}</span>
<span class="cstat-no" title="statement not covered" > failCallback = <span class="fstat-no" title="function not covered" >() =</span>> {}</span>
<span class="cstat-no" title="statement not covered" > cleanUpLocalStorage()</span>
// Briefly wait since localStorage changes can sometimes
// be ignored when immediately redirected.
<span class="cstat-no" title="statement not covered" > setTimeout(<span class="fstat-no" title="function not covered" >() =</span>> <span class="cstat-no" title="statement not covered" >nextFunc(),</span> 100)</span>
}
}, false)
// Use iframe technique for launching the protocol URI rather than setting `window.location`.
// This method prevents browsers like Safari, Opera, Firefox from showing error prompts
// about unknown protocol handler when app is not installed, and avoids an empty
// browser tab when the app is installed.
<span class="cstat-no" title="statement not covered" > Logger.info('Attempting protocol launch via iframe injection.')</span>
const locationSrc = <span class="cstat-no" title="statement not covered" >`${BLOCKSTACK_HANDLER}:${authRequest}&echo=${echoReplyID}`</span>
const iframe = <span class="cstat-no" title="statement not covered" >document.createElement('iframe')</span>
const iframeStyle = <span class="cstat-no" title="statement not covered" >'all: initial; display: none; position: fixed; top: 0; height: 0; width: 0; opacity: 0;'</span>
<span class="cstat-no" title="statement not covered" > iframe.style.cssText = iframeStyle</span>
<span class="cstat-no" title="statement not covered" > iframe.src = locationSrc</span>
<span class="cstat-no" title="statement not covered" > document.body.appendChild(iframe)</span>
}
</pre></td></tr>
</table></pre>
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