Finds all available custom app url strings, for example if you paste and run this github link in your browser x-github-client://openRepo/https://github.com/ghandic/facial_analysis_api

find_all_app_urls.py

import plistlib
import glob
import json
import os

app_urls=[]
for app in glob.glob('/Applications/*.app'):
    urls=[]
    for pl in glob.glob(os.path.join(app, 'contents/Info.plist')):
        try:
            plist = plistlib.readPlist(pl)
            for urltype in plist.get('CFBundleURLTypes'):
                for scheme in urltype.get('CFBundleURLSchemes'):
                    urls.append(scheme)
        except:
            pass
    if len(urls) > 0:
        app_urls.append({app.replace('/Applications/', '').replace('.app', ''):urls})


print(json.dumps(app_urls, indent=2))