Paid extensions (#2229)

* fix: download archive file `async`

* feat: add `pay_link` property

* feat: basic install using internal wallet for payment

* fix: pop-up issues

* chore: refactor

* feat: detect paid extensions

* fix: payment check

* feat: small stuff

* feat: show external invoice

* fix: regression for extension install

* feat: store previos successful payments

* refactor: simplify, almost works

* chore: gugu gaga

* fix: pay and install

* fix: do not pay invoice on the back-end

* chore: code clean-up

* feat: basic websocker listener

* feat: use websocket to watch for invoice payment

* feat: remember hanging invoices

* refactor: extract `localStorage` methods

* chore: code format

* chore: code clean-up after test

* feat: remember previous payment_hashes

* chore: code format

* refactor: rename `ExtensionPaymentInfo` to `ReleasePaymentInfo`

* refactor: method rename

* fix: release version matters now

* chore: code format

* refactor: method rename

* refactor: extract method `_restore_payment_info`

* refactor: extract method

* chore: rollback `CACHE_VERSION`

* chore: code format

* feat: i18n

* chore: update bundle

* refactor: public method name

* chore: code format

* fix: websocket connection

* Update installation.md (#2259)

* Update installation.md (#2260)

* fix: try to fix `openapi` error

* chore: bundle

* chore:bundle

---------

Co-authored-by: benarc <ben@arc.wales>
Co-authored-by: Arc <33088785+arcbtc@users.noreply.github.com>

lnbits/app.py

@@ -194,7 +194,7 @@ async def check_installed_extensions(app: FastAPI):
 
     for ext in installed_extensions:
         try:
-            installed = check_installed_extension_files(ext)
+            installed = await check_installed_extension_files(ext)
             if not installed:
                 await restore_installed_extension(app, ext)
                 logger.info(
@@ -252,14 +252,14 @@ async def build_all_installed_extensions_list(
     ]
 
 
-def check_installed_extension_files(ext: InstallableExtension) -> bool:
+async def check_installed_extension_files(ext: InstallableExtension) -> bool:
     if ext.has_installed_version:
         return True
 
     zip_files = glob.glob(os.path.join(settings.lnbits_data_folder, "zips", "*.zip"))
 
     if f"./{str(ext.zip_path)}" not in zip_files:
-        ext.download_archive()
+        await ext.download_archive()
     ext.extract_archive()
 
     return False