UtowFileUpload.getFileSize throws exception when "Content-Length" header is missing.

[inzagher]

I've tried to upload file from angular 7.
Angular application code looks so:

public upload(id: string, name: string, type: string, data: File): Observable<any> {
    const form = new FormData();
    form.append("id", id);
    form.append("name", name);
    form.append("file", data, data.name);
    form.append("type", !!type ? type : "unknown");
    return this.http.post(this.url, form, { responseType: "text" as "json" });
}

Server side:

@POST("/attach")
@Consumes(MediaType.MULTIPART_FORMDATA)
@Produces(MediaType.TEXT)
public Object attach(Context context) throws Exception {
    FileUpload file = context.file("file");
    long contentSize = file.getFileSize();
    ...
}

When I'm trying to get file size exception is thrown:
java.lang.NumberFormatException: null
at java.lang.Long.parseLong(Long.java:552)
at java.lang.Long.parseLong(Long.java:631)
at io.jooby.internal.utow.UtowFileUpload.getFileSize(UtowFileUpload.java:62)

@Override public long getFileSize() {
    return Long.parseLong(upload.getHeaders().getFirst(Headers.CONTENT_LENGTH));
}

------WebKitFormBoundaryub4A7wV0aSpsIBd8
Content-Disposition: form-data; name="id"

3619f3d0-1aa7-4b41-baaa-f5431a597666
------WebKitFormBoundaryub4A7wV0aSpsIBd8
Content-Disposition: form-data; name="name"

Ping
------WebKitFormBoundaryub4A7wV0aSpsIBd8
Content-Disposition: form-data; name="file"; filename="Ping.xml"
Content-Type: text/xml

------WebKitFormBoundaryub4A7wV0aSpsIBd8
Content-Disposition: form-data; name="type"

unknown
------WebKitFormBoundaryub4A7wV0aSpsIBd8--

As we can see, form data does not contain "Content-Length" header for uploaded file.
I don't know is it bug or my mistake.

[jknack]

Almost sure the content-length must be present for files on multipart form data post. Probably there is something wrong with angular post (not sure).

Anyway, going to change and return -1 when file size is unknown.

Thanks