enhance(dev): non-production環境でhttpサーバー間でもユーザー、ノートの連合が可能なように (#10717)

* enhance(dev): non-production環境でhttpサーバー間でもユーザー、ノートの連合が可能なように

* refactor (use checkHttps)

* MISSKEY_WEBFINGER_USE_HTTP

* Environment Variable readme

* NEVER USE IN PRODUCTION

* fix punyHost

packages/backend/src/core/WebfingerService.ts

@@ -43,7 +43,8 @@ export class WebfingerService {
 		const m = query.match(/^([^@]+)@(.*)/);
 		if (m) {
 			const hostname = m[2];
-			return `https://${hostname}/.well-known/webfinger?` + urlQuery({ resource: `acct:${query}` });
+			const useHttp = process.env.MISSKEY_WEBFINGER_USE_HTTP && process.env.MISSKEY_WEBFINGER_USE_HTTP.toLowerCase() === 'true';
+			return `http${useHttp ? '' : 's'}://${hostname}/.well-known/webfinger?${urlQuery({ resource: `acct:${query}` })}`;
 		}
 
 		throw new Error(`Invalid query (${query})`);