Add SAS Key generation service about azure-storage

[DimosthenisK]

I have already created a quick service like that, and you are free to modify it and add it to the core module. It currently looks like this:

import { Injectable } from '@nestjs/common';
import * as azure from '@azure/storage-blob';
import { ConfigService } from '../config/config.service';
import {
    AccountSASServices,
    AccountSASResourceTypes,
} from '@azure/storage-blob';

@Injectable()
export class AzureSASService {
    private credential: azure.SharedKeyCredential;
    constructor(private readonly configService: ConfigService) {
        this.credential = new azure.SharedKeyCredential(
            this.configService.get('AZURE_STORAGE_ACCOUNT'),
            this.configService.get('AZURE_STORAGE_ACCOUNT_KEY')
        );
    }
    getNewSASKey() { //We should probably add a config object here
        let expiryTime = new Date();
        let startTime = new Date();
        expiryTime.setMonth(new Date().getMonth() + 1);
        startTime.setFullYear(startTime.getFullYear() - 10);
        return (
            '?' +
            azure
                .generateAccountSASQueryParameters(
                    {
                        expiryTime,
                        services: AccountSASServices.parse('b').toString(),
                        resourceTypes: AccountSASResourceTypes.parse(
                            'sco'
                        ).toString(),
                        permissions: azure.ContainerSASPermissions.parse(
                            'racwdl'
                        ).toString(),
                        startTime,
                        ipRange: { start: '0.0.0.0', end: '255.255.255.255' },
                        protocol: azure.SASProtocol.HTTPSandHTTP,
                        version: '2018-11-09',
                    },
                    this.credential
                )
                .toString()
        );
    }
}

[Roytangrb]

May I ask if there is any update on this issue.

Granting access to resources using SAS signed url is pretty common use case of Azure Blob Storage. Sometimes we don't want to use our server bandwidth for download and upload actions. The server might only take care of access management.

I could help with drafting the feature and raise a PR if help is wanted.