File Server

Description

Local file server with a console client that supports multiple connections and stores all file types.

Setup

Requirements

• java 18
• junit-4.13.2.jar (testing)
• hamcrest-core-1.3.jar (testing)

Jar files should be kept in the /lib directory.

Build

To build the project, run the build.sh script.

Alternatively, you can open the project in VSCode with the Extension Pack for Java installed. This extension handles the build process automatically. You can start the services using the provided scripts, the launch.json tasks in the Run and Debug tab, or the Run/Debug Java button.

Usage

1. Start the server using the start_server.sh script.
2. Start the client using the start_client.sh script.
3. Add files to the newly created data/client directory.
4. You can now interact with the server using the client.

Data storage

To store data, the services will create the following directories:

• data/server/storage - Server location for storing files.
• data/server/temp - Temporary server location for newly uploaded files.
• data/server/config - Location for storing persistent server data (e.g. file identifiers).
• data/client - Location from which the client service sends and downloads files to/from the server.

These locations can be customized in src/server/config/Constants.java and src/client/config/Constants.java.

Docs

The client communicates with the server using request messages loosely based on HTTP messages.

Request structure

<method> <path>
<param>=<value>
<param>=<value>
...
<param>=<value>

<body?>

• Single start-line - That consist of a method and a path, separated with a single space.
• Multiple params - Where every parameter is written in single line. Line consists of a param which is param name and a value which is param value, separated with = sign.
• Empty line - For marking end of parameters.
• Body - Which is optional and written in bytes. It is used for file transfer and will be read by server only if POST request was done.

Everything except body is written using writeUTF(String str) method. Body is written in 4kb parts using write(byte[] b, int off, int len). The same is the case with reading data.

Accepted methods

• GET
• POST
• DELETE

Essential params

• message - Message from the server to be displayed on client.
• file-name - Name of the file to be saved on/fetched from the server.
• file-size - Size of the file to be saved on/fetched from the server.
• file-id - Id of the file to be fetched from the server.

Example requests

GET /
file-name=keyboard_cat.jpg

DELETE /id
file-id=12345

POST /
file-name=keyboard_cat.jpg
file-size=2137

<bytes>

Response structure

The server response is similar to the client request, with one key difference: the start line consists of a statusCode indicating the status of the response, instead of a method and path.

Example responses

200
message=File 'keyboard_cat.jpg' was sent.
file-name=keyboard_cat.jpg
file-size=2137

404
message=File 'keyboard_cat.jpg' not found.

Roadmap

Roadmap can be found under ROADMAP.md.