@startuml
skinparam dpi 300
skinparam classFontSize 8
skinparam classFontName Helvetica
autonumber

box "Application" #LightGreen
    participant "Application" as application
end box

box "Third-party \n Library" #LightPink
    participant "http-parser" as parser
end box

box "Libraries" #LightBlue
    participant "HTTP Client" as http
end box

box "HTTP Server" #Yellow
    participant "HTTP Server" as server
end box

activate application

application -> parser : Parse configured pre-signed PUT URL to extract\n host address
activate parser
parser -> application : Return server host address
deactivate parser

loop until session established or all attempts exhausted
application -> server : Establish TLS session\n (client verifies server's certificate)
server -> application : Session established (no client authentication)
end

application -> parser : Parse configured pre-signed PUT URL to extract\n URL path
activate parser
parser -> application : Return path string with request-URI
deactivate parser

application -> application: Set request info parameters
application -> http: Initialize request headers\n (HTTPClient_InitializeRequestHeaders)
activate http
http -> application : Write request headers to user-provided buffer
deactivate http

application -> http: Send HTTP PUT request (HTTPClient_Send)\n to upload file to S3 object
activate http
http -> server: Send payload of request through transport interface
http -> application : Write response to user-provided buffer
deactivate http
application -> application: Log response from contents of buffer

application -> parser : Parse configured pre-signed GET URL to extract\n URL path
activate parser
parser -> application : Return path string with request-URI
deactivate parser

application -> http: Send HTTP GET request (HTTPClient_Send)
activate http
http -> server: Send payload of request through transport interface
http -> application : Write response to user-provided buffer
deactivate http
application -> application: Parse content-range header from response\n to obtain file size

application -> application : Verify that the file size obtained from S3 is\n equivalent to the file size uploaded

application -> server: End TLS session and disconnect from server

deactivate application
@enduml