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module gemini_protocol
implicit none
integer, parameter::STATUS_INPUT = 1
integer, parameter::STATUS_SUCCESS = 2
integer, parameter::STATUS_REDIRECT = 3
integer, parameter::STATUS_TEMPFAIL = 4
integer, parameter::STATUS_PERMFAIL = 5
integer, parameter::STATUS_CERTREQ = 6
integer, parameter::STATUS_LOCALFAIL = -1
integer, parameter::BUFFER_SIZE = 256
contains
function request_url(url, unit_number, server_name) result(returncode)
use request
use iso_c_binding
use file_handling, only: mark_file_end
implicit none
character(*), intent(in)::url
integer, intent(in)::unit_number
character(*), intent(in), optional::server_name
integer::returncode
character(:), allocatable::server
type(connection)::conn
integer::bytes_received, i
character, dimension(BUFFER_SIZE)::buffer
returncode = -1
rewind(unit_number)
if(present(server_name)) then
allocate(character(len=len_trim(server_name)) :: server)
server = server_name
else
server = get_server_from_url(url)
end if
conn = open_connection(server)
if(conn%code == CONNECTION_OPEN) then
if(send_string(conn%ssl, url//c_carriage_return//c_new_line, trimming=.false.)) then
bytes_received = retrieve_characters(conn%ssl, buffer)
do while(bytes_received > 0)
do i=1, bytes_received
write(unit_number, '(A1)', advance='no') buffer(i)
end do
bytes_received = retrieve_characters(conn%ssl, buffer)
end do
call mark_file_end(unit_number)
rewind(unit_number)
read(unit_number, '(I1)') returncode
else
returncode = -1
write(unit_number, *) "Send Error: Could Not Send Request"
write(*, *) "Send Error: Could Not Send Request"
end if
else
returncode = -1
write(unit_number, *) "Connection Error: "//trim(translate_connection_code(conn%code))
write(*, *) "Connection Error: "//trim(translate_connection_code(conn%code))
end if
call close_connection(conn)
end function request_url
subroutine get_redirect_url(unit_number, url)
implicit none
integer, intent(in)::unit_number
character(*), intent(inout)::url
character::search
integer::i, istat
rewind(unit_number)
! Status code
read(unit_number, '(A1)', advance='no') search
read(unit_number, '(A1)', advance='no') search
! Clear the url
url = repeat(" ", len(url))
! At least one whitespace, but whatever...
read(unit_number, '(A1)', advance='no') search
do while(search == " " .or. search == CHAR(9))
read(unit_number, '(A1)', advance='no', iostat=istat) search
end do
! Now search contains our first url component
i = 0
do while(search /= CHAR(13) .and. i < len(url) .and. istat == 0)
i = i + 1
url(i:i) = search
read(unit_number, '(A1)', advance='no', iostat=istat) search
end do
end subroutine get_redirect_url
subroutine handle_relative_url(current_url, path)
implicit none
character(*), intent(inout)::current_url
character(*), intent(in)::path
integer::past_protocol, first_slash, last_slash
past_protocol = index(current_url, "://")
if(past_protocol > 0) then
past_protocol = past_protocol + 3
if(path(1:1) == "/") then
first_slash = index(current_url(past_protocol:len_trim(current_url)), "/")
current_url = current_url(1:(past_protocol + first_slash - 1))//path
else
last_slash = index(current_url, "/", back=.true.)
if(last_slash > 0) then
current_url = current_url(1:last_slash)//path
end if
end if
end if
end subroutine handle_relative_url
end module gemini_protocol
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