System Requirements Specification (SRS)

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Outline the functional and non-functional requirements necessary for the system to meet its defined goal. This includes specifying key features, security standards, and usability criteria. Additionally, identify the components required to implement these requirements, such as software libraries, frameworks, APIs, and hardware infrastructure. This comprehensive specification will serve as a roadmap for development, ensuring that all essential aspects are addressed and enabling effective communication among team members.

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1. Introduction

1.1 Purpose

This Software Requirements Specification (SRS) document outlines the requirements for the software Downloads Hub It focuses on the features, functionality, and capabilities of the software in release version 1.0

The purpose of this SRS is to clearly define the software's requirements and offer a comprehensive overview of the software's functionality, targeted user groups, and the components required to achieve the software's goals. The intended audience includes primarily open-source contributors and volunteers, those can be software developers, testers, or system administrators.

1.2 Scope

The software being specified is named Downloads Hub, a centralized download management system designed to streamline and automate the process of downloading various content types from various sources. It provides a unified interface to manage downloads and allows extensibility through plugins to support diffrent downloads souces and protocols. it will also offer a centralized storage structure to transfer content to.

The software will:

• Allow users to manage and track downloads in a centralized platform.
• Support multiple download sources and protocols through the use of extensions called Download Engines.
• Enable workflows that trigger actions based on download events (e.g., completion, failure).
• Integrate with various storage backends, including local storage and network shares.
• Offer an API for initiating and managing downloads from external systems.

1.3 Definitions, acronyms, and abbreviations

<Describe any standards or typographical conventions that were followed when writing this SRS, such as fonts or highlighting that have special significance. For example, state whether priorities for higher-level requirements are assumed to be inherited by detailed requirements, or whether every requirement statement is to have its own priority.>

<This subsection should provide the definitions of all terms, acronyms, and abbreviations required to properly interpret the SRS. This information may be provided by reference to one or more appendixes in the SRS or by reference to other documents.>

Term	Definition
SRS	Software Requirements Specification
API	Application Programming Interface

1.4 References

<List any other documents or Web addresses to which this SRS refers. These may include user interface style guides, contracts, standards, system requirements specifications, use case documents, or a vision and scope document. Provide enough information so that the reader could access a copy of each reference, including title, author, version number, date, and source or location.>

<This subsection should a) Provide a complete list of all documents referenced elsewhere in the SRS; b) Identify each document by title, report number (if applicable), date, and publishing organization; c) Specify the sources from which the references can be obtained.>

1.5 Overview

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<This subsection should a) Describe what the rest of the SRS contains; b) Explain how the SRS is organized>

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2. Overall Description

2.1 Software Perspective

The software acts as a central hub for managing content downloads from various network sources, featuring a plugin-based architecture for easy integration with additional download tools (Download Engines) and services. It includes basic HTTP download capabilities, with the flexibility to extend support for protocols like FTP and BitTorrent through Download Engines. The software also provides a centralized storage structure accessible to all Download Engines, supports multiple storage backends, and offers key features like a RESTful API and event-driven workflows. This ensures efficient, automated, and extensible download management across different network sources and storage options.

This software is a new, self-contained software designed to address the challenge of managing and automating content downloads from multiple sources in a unified interface. The architecture is built to be modular and extensible, allowing future enhancements without major restructuring. It integrates easily with third-party tools through its API, allowing it to complement other download management tools or applications.

While the software is self-contained, it can operate as part of a larger ecosystem by integrating with third-party applications via its API. For example, it can act as a backend service for frontend clients or as a microservice within a larger system (e.g. media servers or automation systems). The software's RESTful API allows external systems to initiate, monitor and manage downloads, providing flexibility in a larger infrastructure.

2.2 Software Features

The software offers a range of features aimed at providing efficient, extensible, and automated download management:

• Centralized Download Management: Provides a unified interface for managing downloads from multiple network sources, reducing complexity for users who need to handle large volumes of downloads across different protocols.
• Extensibility: Through a plugin-based architecture, the software allows the addition of new download engines and protocol support. Users can extend the software by adding workflow components like triggers, events, and actions, enhancing customization and automation.
• API Integration: A RESTful API allows third-party applications and external systems to interact with the software. Users can initiate, manage, and query download status via the API, enabling seamless integration with external tools.
• Event-Driven Workflows: The software supports workflows that trigger specific actions in response to download events such as completion, failure, or pause. This enables automation, such as moving files after download or sending notifications on failure.
• Multiple Storage Backends: The software supports various storage options, including local storage and network shares (e.g., NFS, SMB), ensuring flexible and centralized management of downloaded content across different backends.

2.3 User Classes and Characteristics

• Tech-Savvy Individuals: Users who frequently manage large volumes of content downloads and seek a centralized solution. This class includes individuals who operate self-hosted servers, home servers, or personal content libraries. These users are comfortable with managing plugins, customizing workflows, and may have the expertise to configure and operate complex system setups. They will utilize the software's extensibility, storage backend integration, and automation capabilities to optimize download management.
• Third-Party Application Developers: Developers integrating the download management functionality into their own applications or systems. This class of users will primarily interact with the software through the RESTful API, leveraging its functionality to extend their projects or manage downloads programmatically. These users require clear API documentation and stable API behavior.
• System Administrators: Administrators managing servers or environments where the software is deployed. This group includes individuals responsible for configuring storage backends, maintaining software performance, and ensuring integration with other network services. They will use the software's workflows, API and extensibility features to ensure downloads are efficiently managed and stored.

2.4 Operating Environment

The software will mainly operate in server environments that support .NET Core and web technologies such as JavaScript and Node.js. The software is designed to be platform-independent and can run on any server operating system, including Windows and Linux, as long as they meet the required software dependencies.

Key aspects of the operating environment include:

• Server Platforms: The software can be deployed on bare-metal servers, virtual machines (VMs), or through containerization technologies such as Docker or Kubernetes, providing flexibility in deployment and scaling.

• Hardware Requirements:

  • CPU: A dual-core processor is the general recommendation for running the software efficiently. For environments with multiple download engines and workflows enabled, such as supporting BitTorrent and HTTPS through qBittorrent and aria2, a quad-core processor is recommended.
  • RAM: A minimum of 2GB RAM is sufficient for basic operations without extensions or multiple download engines. However, depending on the number of enabled extensions and active downloads, particularly when using resource-intensive engines like BitTorrent (qBittorrent) or HTTPS (aria2), it's recommended to have 4GB to 6GB for smooth performance.
  • Disk Space: The core software does not require significant disk space, with a minimum requirement of 500MB for the software alone. Additional space will be needed based on the number of enabled extensions or download engines. As a rule of thumb, it's recommended to allocate 10GB of free disk space to account for temporary files, logs, and multiple download engines.

• Running on Desktop Systems: While the software is primarily designed for server environments, it is also possible to run it on desktop systems using a container solution like Docker. This allows users to deploy the software on a desktop environment (e.g., for testing or lightweight use) without directly installing server software or dependencies on the host machine.

• Database Requirements: The software will use a SQL database for storing configuration, system state, and workflow data. This will not generate a large amount of data, so basic database setups are sufficient. A minimum of 1GB of free space is recommended for the database files, though actual requirements will vary based on the scale of the system and the complexity of workflows.

• Operating System Specific Requirements: Since the software supports network storage backends such as NFS, SMB, and others, the operating system must have the necessary libraries or drivers to support these protocols.

• Network Requirements: As the software manages content downloads from various sources, a stable and reliable network and internet connection are required for optimal performance.

• Dependencies: The software relies on external technologies like .NET Core for backend services and Node.js for the frontend user interface. Additional tools and libraries may be required depending on the specific Download Engines and Workflows added to the software.

2.5 Design and Implementation Constraints

The following design and implementation constraints apply to the development of the Software:

• Hardware Limitations: The software must be capable of running efficiently on hardware with limited resources, such as low-end servers or desktop environments running containers. Performance must remain acceptable with minimal CPU and memory, especially when no extensions are enabled. However, resource-intensive extensions (e.g., BitTorrent engines) will require more CPU and RAM, which may limit deployment on smaller hardware configurations.

• Database Constraints: The software will use a SQL-based relational database to store configuration, state, and workflow data. No large volumes of data are expected, but the software must be designed to efficiently manage the database interactions without overwhelming the database server or causing performance bottlenecks in small deployments.

• Platform Constraints:

  • .NET Core must be used for backend services and the API, limiting the options for programming languages and frameworks that can be used. Node.js and Vue.js will be used for the frontend, which restricts the choice of frontend frameworks and libraries.
  • The software must be cross-platform, supporting Windows and Linux, which introduces the need for platform-agnostic solutions (e.g., handling of network shares, file systems).

• External Interfaces:

  • The software must support integration with third-party download engines, requiring a well-defined interface specification for plugins. This constrains how extensions must be developed to conform to the software's plugin architecture.
  • API integration must follow RESTful conventions for third-party applications to interact with the software, limiting the communication protocols to HTTP/HTTPS and ensuring secure and stateless interactions.

• Security Considerations:

  • The software must adhere to security best practices, particularly in handling downloads from potentially untrusted sources. This includes secure storage of credentials for network shares or remote services and encryption of sensitive data in transit (e.g., using SSL/TLS for API communications).
  • The software must implement user authentication and authorization mechanisms to control access to the API and user interface, ensuring that unauthorized users cannot manipulate downloads or workflows.

• Design Conventions:

  • The software must follow standard coding conventions for .NET and JavaScript development to ensure maintainability and readability. Developers contributing to the software will need to adhere to these standards, which may limit flexibility in implementation styles.
  • The software must comply with Docker containerization standards, as it will be deployed using Docker in many environments. This requires a consistent and lightweight Docker image to minimize deployment issues.

2.6 User Documentation

The following documentations will be delivered with the software:

• Setup Manual: A comprehensive user manual will be provided, detailing the installation and configuration of the software. It will include instructions for:

  • Installing and setting up the software on supported platforms.
  • Setting up storage backends.
  • Configuring extensions and Download Engines.
  • Integrating third-party applications via the API.

• User Manual: A comprehensive user manual will be provided, detailing the usage of the software. It will include instructions for:

  • Download management operations.
  • Workflow creation and management.
  • Using the workflow features.

• API Documentation: A detailed API reference will be provided for developers integrating third-party applications or services. It will describe all available API endpoints, request/response formats, and authentication mechanisms.

2.7 Assumptions and Dependencies

The following assumptions and dependencies have been identified for the development of the Software:

• Third-Party Components:

  • It is assumed that third-party download engines (e.g., qBittorrent, aria2) will be available and maintained to support the software's extensibility for different protocols (BitTorrent, HTTP, FTP, etc.). The software depends on these external tools to manage certain types of downloads.
  • The software assumes that these third-party tools are compatible with the software's plugin architecture and will remain available in future versions.

• Containerization:

  • It is assumed that the software will primarily be deployed using Docker or other container technologies. Therefore, the software's configuration, installation, and operation are dependent on the availability of Docker or an equivalent container runtime.
  • The successful operation of the software on non-containerized environments is considered secondary, and issues related to non-containerized environments may not be prioritized.

• Operating System Support:

  • The software assumes that the underlying operating system supports necessary network storage protocols (e.g., NFS, SMB). Users will be responsible for ensuring that their server environments have the required network share libraries or drivers installed and properly configured.
  • Any limitations or incompatibilities with specific operating systems could affect the deployment of the software's storage backend features.

• Database:

  • The software assumes the availability of a SQL database (e.g., MySQL, PostgreSQL) for storing configuration, state, and workflow data. It is dependent on the correct setup, performance, and maintenance of this database to function correctly.
  • The software assumes that the database server will handle small volumes of data efficiently and that it can be scaled up if more extensive use requires additional resources.

• Network Connectivity:

  • It is assumed that the software will be deployed in environments with reliable network connectivity, as it will need constant access to external download sources (HTTP, FTP, BitTorrent) and storage backends (NFS, SMB).
  • Any network interruptions or instability could hinder the software's ability to perform downloads or manage storage backends effectively.

• Future Extensibility: The software is designed to be extensible, assuming that future Download Engines and extensions will be developed by third parties. It depends on the ability of developers to adhere to the software's plugin architecture and interface specifications.

• Security Requirements: The software assumes that appropriate network security configurations will be in place, such as firewalls and secure access to APIs, network shares, and databases. Any security misconfigurations could compromise the integrity and availability of the software.