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! Copyright (c) 2021 Approximatrix, LLC <support@approximatrix.com>
!
! Permission is hereby granted, free of charge, to any person obtaining a copy
! of this software and associated documentation files (the "Software"), to deal
! in the Software without restriction, including without limitation the rights
! to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
! copies of the Software, and to permit persons to whom the Software is
! furnished to do so, subject to the following conditions:
!
! The above copyright notice and this permission notice shall be included in
! all copies or substantial portions of the Software.
!
! The Software shall be used for Good, not Evil.
!
! THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
! IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
! FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
! AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
! LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
! OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
! SOFTWARE.

module http_post_utilities
implicit none

    character(*), parameter::content_type_required = "application/x-www-form-urlencoded"

contains

    function read_post_contents() result(res)
    use query_utilities, only: query
    use logging
    implicit none
    
        type(query)::res
        
        character(len=:), allocatable::transfered
        character(256)::header_info
        integer::content_length, istat, i
        
        call get_environment_variable("CONTENT_LENGTH", header_info, status=istat)
        if(istat == 0) then
            read(header_info, *) content_length
        else 
            content_length = 0
        end if
        
        call get_environment_variable("CONTENT_TYPE", header_info, status=istat)
        if(content_length > 0 .and. &
           istat == 0 .and. &
           trim(header_info) == content_type_required) &
        then
            
            allocate(character(len=content_length) :: transfered)
            
            do i = 1, content_length
                read(*, '(A1)', advance='no') transfered(i:i)
            end do
        
            call res%init(transfered)
        
            deallocate(transfered)
            
        end if
    
    end function read_post_contents

end module http_post_utilities