spl/http.spl

"#stream.spl" import
"#net.spl" import

"http" net:register

construct net:http namespace {
    Request
    Response
    help
}

construct net:http:Request {
    host port
    method path
    headers
    body
    ;
    construct { this | with host port method path this ;
        host this:=host
        port this:=port
        method this:=method
        path this:=path
        List:new this:=headers
        "" this:=body
        this
    }
    add-header { this | with header this ;
        header this:headers:push
        this
    }
    set-body { this | with body this ;
        body this:=body
        this
    }
    send { net:http:Response | with this ;
        def stream this:host this:port StreamTypes:tcp:create =stream
        def response net:http:Response:new =response

        this:method:to-bytes stream:write-exact;
        " " _:to-bytes stream:write-exact;
        this:path:to-bytes stream:write-exact;
        " HTTP/1.0\r\n" _:to-bytes stream:write-exact;

        "Host: " _:to-bytes stream:write-exact;
        this:host:to-bytes stream:write-exact;
        "\r\nConnection: Close\r\nUser-Agent: http.spl v0.1 2023-03 (spl@mail.tudbut.de)\r\n"
            _:to-bytes stream:write-exact;

        { | with header ;
            header:to-bytes stream:write-exact;
            "\r\n" stream:write-exact;
        } this:headers:foreach

        "Content-Length: " _:to-bytes stream:write-exact;
        def body this:body:to-bytes =body
        body:len _str:to-bytes stream:write-exact;
        "\r\n\r\n" _:to-bytes stream:write-exact;
        
        body stream:write-exact;
        stream:flush;

        def response 1024 stream:read-to-end =response

        response net:http:Response:new:read-from-bytes

        stream:close;
    }
}

construct net:http:help namespace {
    ;
    assert-str { | with expected iter _ ;
            [ { | pop iter:next } (expected _array):len:foreach ] _str
            expected _str
        eq not if {
            "Expected " expected concat throw
        }
    }
    until-str { str | with expected iter _ ;
        def match 0 =match
        def bytes expected:to-bytes =bytes
        [
            while { match bytes:len eq not } {
                iter:next dup (match bytes:get) eq dup if {
                    match ++ =match
                } not if {
                    0 =match
                }
            } 
            { | pop pop } match:foreach
        ] _str
    }
}

construct net:http:Response {
    version
    state-num state-msg
    headers
    body
    ;
    construct { this | with this ;
        MicroMap:new this:=headers
        "" this:=body
        this
    }
    read-from-bytes { this | with bytes this ;
        use net:http:help
        bytes:iter =bytes
        "HTTP/" bytes help:assert-str
        " " bytes help:until-str this:=version
        " " bytes help:until-str _mega this:=state-num
        "\r\n" bytes help:until-str this:=state-msg
        while { "\r\n" bytes help:until-str dup "" eq not } {
            def iter ": " swap:split:iter =iter
            (
                iter:next ": "
                iter:join 
            ) this:headers:set;
        } pop
        0 ("Content-Length" this:headers:get _mega) bytes:collect:sub this:=body
        this
    }
    content-type { str | with this ;
        "Content-Type" this:headers:get
    }
}