wip: implementing dynamic devtools API

8ec9dd1d · lukas.niegsch · 81932ac6 · 8ec9dd1d · 8ec9dd1d · 8ec9dd1d
Commit 8ec9dd1d authored Jul 15, 2022 by lukas.niegsch
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gadget_browser.html gadget_browser.html +10 -0

gadget_devtools.html gadget_devtools.html +56 -0

gadget_devtools.js gadget_devtools.js +66 -0

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--- a/gadget_browser.html
+++ b/gadget_browser.html
 <!DOCTYPE html>
 <html>
+	<!--
+		This will be removed later. Implementing each function inside CDP
+		manually takes is too much work. So gadget_devtools.html will provide
+		a dynamic solution.
+	--->
 	<head>
 		<title>Browser Gadget</title>
 		<script src="include/nexedi/rsvp.js"></script>
@@ -7,4 +12,9 @@
 		<script src="include/nexedi/renderjs.js"></script>
 		<script src="gadget_browser.js"></script>
 	</head>
+	<div
+		data-gadget-url="gadget_devtools.html"
+		data-gadget-scope="devtools"
+		data-gadget-sandbox="public">
+	</div>
 </html>
\ No newline at end of file
--- a/gadget_devtools.html
+++ b/gadget_devtools.html
+<!DOCTYPE html>
+<html>
+	<!--
+		This gadget controls an remote browser via the chrome devtools protocol.
+		The remote browser must support the protocol, run in headless mode, and
+		must be available with the following parameters:
+			BROWSER_URL
+			BROWSER_USERNAME
+			BROWSER_PASSWORD
+		This gadget also requires that Cross-Origin Resource Sharing with the
+		BROWSER_URL is enabled.
+		Example (chromium running on localhost):
+		google-chrome-stable --headless --remote-debugging-port=9222
+		-> BROWSER_URL="http://localhost:9222"
+		-> BROWSER_USERNAME="ignored"
+		-> BROWSER_PASSWORD="ignored"
+		Example (chromium running on slapos):
+		slapos request ${SOFTWARE_NAME} ${SOFTWARE_RELEASE_URI}
+		-> BROWSER_URL="https://softinstXXXXX.host.vifib.net"
+		-> BROWSER_USERNAME="admin"
+		-> BROWSER_PASSWORD="password"
+		Usage:
+		var devtools;
+		this.getDeclaredGadget("devtools")
+			.push(function (subgadget) {
+				devtools = subgadget;
+				return devtools.Page.enable();
+			})
+			.push(function () {
+				return devtools.Page.navigate({url: "https://www.example.com"});
+			})
+			.push(function () {
+				return devtools.Page.loadEventFired();
+			})
+		The variable devtools contains this gadget. This gadget has several
+		subobjects according to the protocol, e.g. Page. Each subobjects has
+		methods and events. Both of them can be used like regular functions.
+		Calling a method will trigger it, and calling an event will wait
+		until the browser triggers it. Some methods will return some types,
+		which we encode as objects. See the references on how to use the
+		different methods, events, and types.
+		References:
+		https://chromedevtools.github.io/devtools-protocol
+	--->
+	<head>
+		<title>Devtools Gadget</title>
+		<script src="include/nexedi/rsvp.js"></script>
+		<script src="include/nexedi/renderjs.js"></script>
+		<script src="gadget_devtools.js"></script>
+	</head>
+</html>
\ No newline at end of file
--- a/gadget_devtools.js
+++ b/gadget_devtools.js
+// todo: move outside of this gadget
+var BROWSER_URL = "http://localhost:9222";
+var BROWSER_USERNAME = "ignored";
+var BROWSER_PASSWORD = "ignored";
+(function(window, rJS, RSVP) {
+	"use strict";
+	/**
+	 * Makes an HTTP get request to the browser to retrieve some JSON data.
+	 *  
+	 * @param {String} path The path of the json file.
+	 * @returns The promise for the the JSON data as object. 
+	 */
+	function getBrowserJSON (path) {
+		var callback = (resolve, reject) => {
+			var request = new XMLHttpRequest();
+			var url = (new URL(path, BROWSER_URL)).href;
+			request.open("GET", url, true, BROWSER_USERNAME, BROWSER_PASSWORD);
+			request.withCredentials = true;
+			request.onload = () => {
+				resolve(JSON.parse(request.responseText));
+			}
+			request.onerror = (error) => {
+				reject("Could not connect to browser!");
+			}
+			request.send();
+		}
+		return RSVP.Queue().push(function () {
+			return new RSVP.Promise(callback);
+		});
+	}
+	/**
+	 * Returns the devtools API for the given domain. Domains are defined
+	 * by the devtools protocol, e.g. Page. Each domain defines multiple
+	 * methods, events, and types.
+	 * 
+	 * @param {object} domain The domain data from the devtools API.
+	 * @returns The promise for the devtools API object and its name.
+	 */
+	function getDevtoolsAPI(domain) {
+		var callback = (resolve) => {
+			console.log(domain.domain);
+			resolve({name: domain.domain, object: null});
+		}
+		return RSVP.Queue().push(function () {
+			return new RSVP.Promise(callback);
+		});		
+	}
+	var gadget = rJS(window);
+	gadget.declareService(function () {
+		return getBrowserJSON("json/protocol")
+			.push(function (result) {
+				var promises = [];
+				for (let i = 0; i < result.domains.length; i++) {
+					promises.push(getDevtoolsAPI(result.domains[i]));
+				}
+				return RSVP.all(promises);
+			})
+			.push(function (result) {
+				for (let i = 0; i < result.length; i++) {
+					gadget[result[i].name] = result[i].object;
+				}
+			})
+	})
+}(window, rJS, RSVP));
\ No newline at end of file