path: root/captain/response.f90

module server_response
use iso_c_binding
implicit none

    integer, parameter::GEMINI_CODE_INPUT    = 10
    integer, parameter::GEMINI_CODE_SUCCESS  = 20
    integer, parameter::GEMINI_CODE_REDIRECT = 30
    integer, parameter::GEMINI_CODE_PERMFAIL = 50

    type :: response
    
        integer::code
        
        ! Used for redirects
        character(len=:), pointer::url => null()
        
        ! Used for inputs in gemini
        character(len=:), pointer::message => null()
        
        logical::temporary_file = .false.
        character(len=:), pointer::body_filename => null()
        character(len=64)::body_mimetype
        
        contains
        
        procedure :: destroy => response_destroy
        procedure :: set_message => response_set_message
        procedure :: set_url => response_set_url
        procedure :: set_body_contents => response_temp_file_contents
        procedure :: set_filename => response_set_filename_using_allocation
        
    end type
    
    type :: request
    
        character(len=:), pointer::url => null()
        character(len=:), pointer::server => null()
        character(len=:), pointer::protocol => null()
        character(len=:), pointer::location => null()
        character(len=:), pointer::query_string => null()
    
        contains
        
        procedure :: init => request_init
        procedure :: destroy => request_destroy
        procedure :: last_component => request_last_component
        procedure :: path_component => request_component
        procedure :: path_component_int => request_component_int
        procedure :: component => request_component_func

    end type request
    
    type, extends(request) :: titan_request

        integer(kind=8)::size
        character(len=:), pointer::mimetype
        character(len=:), pointer::token
        
        type(c_ptr)::ssl_connection
        
        contains
        
        procedure :: init_from_request => titan_request_init
        procedure :: destroy => titan_request_destroy
        procedure :: write_to => titan_write_to_filename
    
    end type titan_request
    
contains

    subroutine request_init(self, str)
    use logging
    implicit none
    
        class(request) :: self
        character(*), intent(in)::str
        
        integer::i, j, n
        
        n = len_trim(str)
        allocate(character(len=n) :: self%url)
        self%url = trim(str)
        call write_log("URL: "//self%url, LOG_NORMAL)
        
        i = index(str, "://")
        allocate(character(len=(i-1)) :: self%protocol)
        self%protocol = str(1:i-1)
        call write_log("Protocol: "//self%protocol, LOG_DEBUG)
        
        i = i + 3
        j = index(str(i:n), "/")
        if(j <= 0) then
            j = len_trim(str) + 1 - i
        end if
        allocate(character(len=(j-1)) :: self%server)
        self%server = str(i:(i+j-1))
        call write_log("Server: "//self%server//"|", LOG_DEBUG)
        
        i = j+i-1
        j = index(str, "?")
        if(j == 0) then
            if(n-i+1 == 0) then
                allocate(character(len=1) :: self%location)
                self%location = "/"
            else
                allocate(character(len=(n - i + 1)) :: self%location)
                self%location = str(i:n)
            end if
            call write_log("Location: "//self%location, LOG_DEBUG)
            
        else
            allocate(character(len=(n-j)) :: self%query_string)
            self%query_string = str(j+1:n)
            call write_log("Query: "//self%query_string, LOG_DEBUG)
            
            allocate(character(len=(j-i)) :: self%location)
            self%location = str(i:j-1)
            call write_log("Location: "//self%location, LOG_DEBUG)
        end if
    
    end subroutine request_init
    
    subroutine request_component(self, i_component, res)
    use logging
    implicit none
    
        class(request) :: self
        integer, intent(in)::i_component
        character(*), intent(out)::res
        
        integer::i, j, i_last, n
        
        res = " "
        
        n = len_trim(self%location)

        i_last = 0
        j = 0
        i = index(self%location, "/")
        do while(i /= i_last .and. j < i_component)
            j = j + 1
            
            i_last = i
            i = index(self%location(i_last+1:n), "/")
            i = i_last + i
        end do
        
        ! Found
        if(j == i_component) then
            if(i == i_last) then
                res = self%location(i_last+1:n)
            else
                res = self%location(i_last+1:i-1)
            end if
        end if
        
    end subroutine request_component
    
    
    function request_component_int(self, i) result(res)
    implicit none
    
        class(request) :: self
        integer, intent(in)::i
        integer :: res
        
        character(24)::restext
        
        restext = " "
        
        call self%path_component(i, restext)
        
        read(restext, '(I16)') res
    
    end function request_component_int
    
    
    function request_component_func(self, i) result(res)
    implicit none
    
        class(request) :: self
        integer, intent(in)::i
        character(128) :: res
        
        res = " "
        
        call self%path_component(i, res)
    
    end function request_component_func

    subroutine request_last_component(self, res)
    implicit none
    
        class(request) :: self
        character(*), intent(out)::res
        
        integer::i, n
        
        n = len_trim(self%location) 
        if(n == 1) then
            res = "/"
        else
        
            i = index(self%location, "/", back=.true.)
        
            if(i == n) then
                i = index(self%location(1:n-1), "/", back=.true.)
                if(i > 0) then
                    res = self%location(i+1:n-1)
                else
                    res = "/"
                end if
            else
                res = self%location((i+1):n)
            end if
        end if
        
    end subroutine request_last_component
    
    subroutine request_destroy(self)
    implicit none
    
        class(request) :: self
        
        if(associated(self%url)) then
            deallocate(self%url)
        end if
        
        if(associated(self%server)) then
            deallocate(self%server)
        end if
        
        if(associated(self%location)) then
            deallocate(self%location)
        end if
        
        if(associated(self%query_string)) then
            deallocate(self%query_string)
        end if
        
        if(associated(self%protocol)) then
            deallocate(self%protocol)
        end if
        
    end subroutine request_destroy

    subroutine response_destroy(resp)
    implicit none
    
        class(response)::resp
    
        if(associated(resp%url)) then
            deallocate(resp%url)
        end if
        
        if(associated(resp%message)) then
            deallocate(resp%message)
        end if
        
        if(associated(resp%body_filename)) then
            if(resp%temporary_file) then
                call unlink(resp%body_filename)
            end if
            deallocate(resp%body_filename)
        end if
    
    end subroutine response_destroy
    
    subroutine response_set_message(resp, str)
    implicit none
    
        class(response)::resp
        character(*), intent(in)::str
        
        if(len_trim(str) > 0) then
            allocate(character(len=len_trim(str)) :: resp%message)
            resp%message = trim(str)
        end if
    
    end subroutine response_set_message
    
    subroutine response_set_url(resp, str)
    implicit none
    
        class(response)::resp
        character(*), intent(in)::str
        
        if(len_trim(str) > 0) then
            allocate(character(len=len_trim(str)) :: resp%url)
            resp%url = trim(str)
        end if
    
    end subroutine response_set_url
    
    subroutine response_temp_file_contents(resp, str, mimetype)
    use utilities, only: generate_temporary_filename
    implicit none
    
        class(response)::resp
        character(*), intent(in)::str
        character(*), intent(in), optional::mimetype
        
        integer::unum
        
        resp%body_filename => generate_temporary_filename()
        open(newunit=unum, file=resp%body_filename, action="write", status="new")
        write(unum, *) str
        close(unum)
        
        resp%temporary_file = .true.
        
        if(present(mimetype)) then
            resp%body_mimetype = mimetype
        else
            resp%body_mimetype = "text/plain"
        end if
    
    end subroutine response_temp_file_contents
    
    subroutine response_set_filename_using_allocation(resp, fname, mimetype)
    implicit none
    
        class(response)::resp
        character(*), intent(in)::fname
        character(*), intent(in), optional::mimetype
            
        allocate(character(len=len_trim(fname)) :: resp%body_filename)
        resp%body_filename = trim(fname)
        
        if(present(mimetype)) then
            resp%body_mimetype = mimetype
        else
            resp%body_mimetype = "text/plain"
        end if
        
    end subroutine response_set_filename_using_allocation
    
    function titan_get_request_value( full_location, label) result(p)
    implicit none
    
        character(*), intent(in)::full_location, label
        character(len=:), pointer::p
        
        integer::i, j, n, label_width
        
        label_width = len_trim(label)
        
        n = len_trim(full_location)
        i = index(full_location, ";"//trim(label)//"=")
        j = index(full_location(i+1:n), ";")
        if(j<=0) then 
            j = n
        else
            j = j+i
        end if
        i = i + label_width + 2
        
        allocate(character(len=(j-i+1))::p)
        p = full_location(i:j)
        
    end function titan_get_request_value
    
    subroutine titan_request_init(self, regular_request, ssl_connection)
    implicit none
    
        class(titan_request)::self
        class(request), intent(inout)::regular_request
        type(c_ptr)::ssl_connection
        
        character(len=:), pointer::size_text
        integer::i, ierr
        
        self%url => regular_request%url
        regular_request%url => null()
        
        self%protocol => regular_request%protocol
        regular_request%protocol => null()
        
        self%server => regular_request%server
        regular_request%server => null()
        
        self%query_string => regular_request%query_string
        
        i = index(regular_request%location, ";")
        allocate(character(len=(i-1)) :: self%location)
        self%location = regular_request%location(1:i-1)
        
        size_text => titan_get_request_value(regular_request%location, "size")
        read(size_text, '(I16)', iostat=ierr) self%size
        if(ierr /= 0) then
            self%size = 0
        end if
        deallocate(size_text)
        
        self%mimetype => titan_get_request_value(regular_request%location, "mime")
        self%token => titan_get_request_value(regular_request%location, "token")
        
        self%ssl_connection = ssl_connection
        
    end subroutine titan_request_init
    
    subroutine titan_request_destroy(self)
    implicit none
    
        class(titan_request)::self
        
        if(associated(self%mimetype)) then
            deallocate(self%mimetype)
        end if
        if(associated(self%token)) then
            deallocate(self%token)
        end if
        
        call request_destroy(self)
        
    end subroutine titan_request_destroy
    
    subroutine titan_write_to_filename(self, filename)
    use jessl, only: ssl_read
    use logging
    implicit none
    
        class(titan_request)::self
        character(*), intent(in)::filename
        integer::unum
        
        character, dimension(64)::buf
        integer::bufread
        
        integer(kind=8)::bytes_to_go
        integer::i
        
        character(128)::msg
        
        open(newunit=unum, file=filename, status="unknown", action="write", access="stream", form="formatted")

        bytes_to_go = self%size
        
        do while(bytes_to_go > 0)
            bufread = ssl_read(self%ssl_connection, buf)
            bytes_to_go = bytes_to_go - bufread
            do i = 1, bufread
                write(unum, '(A1)', advance='no') buf(i)
            end do
        end do
        
        close(unum)
        
    end subroutine titan_write_to_filename
    
end module server_response