Get and set CMake HTTP user agent

user_agent.cmake

cmake_minimum_required(VERSION 3.19)

option(CMAKE_TLS_VERIFY "Check cert" ON)

function(user_agent url fn)

file(DOWNLOAD ${url} ${fn}
STATUS stat
)

if(NOT stat EQUAL 0)
  message(FATAL_ERROR "${url}: ${stat}")
endif()

endfunction()


function(fake_user_agent url fn)

# Date isn't needed, it's just an example of setting multiple HTTPHEADER
string(TIMESTAMP now "%a, %d %b %Y %H:%M:%S +0000" UTC)

file(DOWNLOAD ${url} ${fn}
HTTPHEADER "Date: ${now}"
HTTPHEADER "Mozilla/5.0"
STATUS stat
)

if(NOT stat EQUAL 0)
  message(FATAL_ERROR "${url}: ${stat}")
endif()

endfunction()



function(parse_json json_file)

file(READ ${json_file} meta)
string(JSON ua GET ${meta} 0 ua rawUa)

message(STATUS "CMake ${CMAKE_VERSION} user agent:  ${ua}")
message(VERBOSE "${meta}")

endfunction()



set(url https://www.whatsmyua.info/api/v1/ua)
set(fn ua.json)

user_agent(${url} ${fn})
parse_json(${fn})

fake_user_agent(${url} ${fn})
parse_json(${fn})