File Upload Process Component Methods (Angular)

file-upload.component.ts

startUpload(): void {
    const filesToUpload = [];
    this.files.forEach(f => {
        const uuid = UtilService.generateUUID();
        filesToUpload.push({
            'name': f.name,
            'size': f.size,
            'uuid': uuid
        });
        this.fileUUIDList.push(uuid);
    });

    this.sharingSubscription = from(this.getSharingLink(filesToUpload)).subscribe(shareResponse => {
        if (!shareResponse) {
            return;
        }

        this.uploadSubscription = from(this.getUploadLinks()).subscribe((uploadResponse) => {
            if (!uploadResponse) {
                return;
            }

            const multipleFileUploadRequests = [];
            this.files.forEach((f, index) => {
                const fileInfo = {
                    file: f,
                    signature: this.uploadLinkInfo[index].uploadUUID,
                    url: this.uploadLinkInfo[index].uploadLink
                };
                multipleFileUploadRequests.push(this.uploadFile(fileInfo));
            });

            this.forkJoinSubscription = forkJoin(multipleFileUploadRequests).subscribe(
                () => {
                    this.progressSize = this.finalSize;
                    this.transferredSize = 100;
                    this.isUploadComplete = true;
                },
                error => {
                    this.isUploadFailure = true;
                    this.notificationService.showError(this.translateService.instant('ERR_UNKNOWN_ERROR_HAS_OCCURED'));
                });
        });
    });
}

uploadFile(fileInfo: any): Observable<any> {
    return this.uploadService.uploadFile(fileInfo).pipe(map(
        event => {
            if (this.utilService.isHttpProgressEvent(event)) {
                this.uploadingFileMap.set(fileInfo.file.name, event.total ? event.loaded : 0);
                let sum = 0;
                this.uploadingFileMap.forEach((v) => sum += v);
                this.transferredSize = sum;
                this.progressSize = Math.round(this.transferredSize * 100 / this.finalSize);
                this.transferredSizeStr = UtilService.formatBytes(Number(this.transferredSize));
            }
        })
    );
}