S3 doesn't generate latest-mac.json if the bucket has a dot in its name and the region isn't specified

[ariporad]

• electron-builder version: 16.8.3
• Target: macOS

S3 doesn't generate latest-mac.json for buckets with a dot in their name if the region is not manually specified. If you specify a region or don't have a dot in your bucket name, then it all works fine. Uploading other artifacts also works.

[develar]

What region do you use?

[ariporad]

us-east-1 (N. Virginia)

[fernetmatt]

Is it just a problem only on upload? Do you find latest-mac.json file into "dist/" folder?
I've found relevant code into electron-publisher-s3 package:

File s3Publisher.js

static checkAndResolveOptions(options, channelFromAppVersion) {
        return (0, (_bluebirdLst || _load_bluebirdLst()).coroutine)(function* () {
            const bucket = options.bucket;
            if (bucket == null) {
                throw new Error(`Please specify "bucket" for "s3" update server`);
            }
            if (bucket.indexOf(".") !== -1 && options.region == null) {
                // on dotted bucket names, we need to use a path-based endpoint URL. Path-based endpoint URLs need to include the region.  
                const s3 = new (_awsSdk || _load_awsSdk()).S3({ signatureVersion: "v4" });
                options.region = (yield s3.getBucketLocation({ Bucket: bucket }).promise()).LocationConstraint;
            }
            if (options.channel == null && channelFromAppVersion != null) {
                options.channel = channelFromAppVersion;
            }
        })();
    }

[develar]

Reopen if still actual.