Chrome Extension that implements http://go/link URL interceptor

go-url-interceptor.js

const BASE_URL = "https://internal.redirectservice.com/golinks";
window.RedirectRulesConfig = [
    { path: "go", host: BASE_URL },
    { path: "docs", host: `${BASE_URL}/docs-` },  // establish a standard early
    { path: "pd", host: `${BASE_URL}/pd-` },  // pagerduty links for teams/services
    { path: "ldap", host: `https://internal.redirectservice.com/ldap/?q=` },
    { path: "people", host: `https://internal.redirectservice.com/people/` },
];

const MANIFEST_JSON = {
    "manifest_version": 3,
    "name": "PassGo",
    "version": "1.0.0",
    "description": "Internal Chrome Extension to redirect golinks\nhandles:\n - `go/foo` -> `https://internal.redirectservice.com/golinks/foo`\n - `http(s)://go/bar` -> `https://internal.redirectservice.com/golinks/bar`\n - Chrome search by typing \"go\" followed by the shortname e.g. `go something`",
    "permissions": [
        "webNavigation",
        "tabs"
    ],
    "omnibox": {
        "keyword": "go"
    },
    "host_permissions": [
        "*://go/*",
        "*://*.google.com/*",
        "*://docs/*",
        "*://ldap/*",
        "*://pd/*",
        "*://people/*"
    ],
    "icons": {
        "16": "assets/images/icon/16.png",
        "32": "assets/images/icon/32.png",
        "48": "assets/images/icon/48.png",
        "128": "assets/images/icon/128.png"
    },
    "background": {
        "service_worker": "assets/scripts/passgo.js"
    },
    "action": {
        "default_icon": "assets/images/default_icon.png"
    }
}

chrome.omnibox.onInputEntered.addListener(function (text) {
    // omnibox only supports one keyword
    // we patch in the ability to redirect go docs some-service
    const [command, ...args] = text.split(' ');
    const argument = args.join(' ');
    const rule = window.RedirectRulesConfig.find(r => r.path === command);
    if (rule) {
        const newUrl = `${rule.host}${encodeURIComponent(argument)}`;
        chrome.tabs.update({ url: newUrl });
    } else {
        const simpleRedirectUrl = `${BASE_URL}/${text}`;
        chrome.tabs.update({ url: simpleRedirectUrl });
    }
});

chrome.webNavigation.onBeforeNavigate.addListener(async (details) => {
    try {
        if (details.frameId !== 0) {
            // ignore embedded iframes
            return;
        }

        const url = new URL(details.url);
        if (url.hostname.endsWith("google.com")) {
            // Catch google search redirects for go/something
            const goSlashRegex = /\?.*q=go%2F([^&]+)/;
            const goSlashMatch = url.search.match(goSlashRegex);
            if (goSlashMatch) {
                const goSlashRedirectUrl = `${BASE_URL}/${match[1]}`;
                chrome.tabs.update(details.tabId, { url: goSlashRedirectUrl });
            }

            // fallback to other custom rules
            for (const rule of window.RedirectRulesConfig) {
                const regexSecondary = new RegExp(`\\?.*q=${encodeURIComponent(rule.path)}%2F([^&]+)`);
                const matchSecondary = url.search.match(regexSecondary);
                if (matchSecondary) {
                    const customRedirectUrl = `${rule.host}${match[1]}`;
                    chrome.tabs.update(details.tabId, { url: customRedirectUrl });
                }
            }
        } else if (url.hostname == "go") {
            const customRedirectUrl = `${BASE_URL}${url.pathname}`;
            chrome.tabs.update(details.tabId, { url: customRedirectUrl });
        } else {
            const matchingRule = window.RedirectRulesConfig.find(r => r.path === url.hostname);
            if (matchingRule) {
                const matchingRedirectUrl = `${matchingRule.host}${url.pathname}`;
                chrome.tabs.update(details.tabId, { url: matchingRedirectUrl });
            }
        }
    } catch (error) {
        console.error("Error handling custom redirect navigation:", error);
    }
});

chrome.action.onClicked.addListener((tab) => {
  chrome.tabs.create({ url: BASE_URL });
});