C-WebSockets/HttpHelper.hpp at master · imasiprojects/C-WebSockets · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
#pragma once
#include <iostream>

class HttpHelper
{
    static bool parseHeaderField(std::string strField, std::pair<std::string, std::string>* field)
    {
        size_t pos = strField.find(":");

        if (pos == std::string::npos || pos == 0)
        {
            return false;
        }

        field->first = strField.substr(0, pos);
        size_t p1 = strField.find_first_not_of(" \t\r\n", pos + 1),
               p2 = strField.find_last_not_of(" \t\r\n");

        if (p1 == std::string::npos || p2 == std::string::npos || p1 > p2)
        {
            field->second = "";
        }
        else
        {
            field->second = strField.substr(p1, p2 - p1 + 1);
        }

        return true;
    }

public:
    static std::map<std::string, std::string> parseHeader(std::string fullHeader)
    {
        std::map<std::string, std::string> headers;
        size_t pos = 0,
            last = 0;
        std::pair<std::string, std::string> field;

        do
        {
            pos = fullHeader.find("\r\n", last);

            if (parseHeaderField(fullHeader.substr(last, pos - last), &field))
            {
                headers.insert(field);
            }

            last = pos + 2;
        } while (pos != std::string::npos);

        return headers;
    }

    static std::string getHeaderValue(std::string allHeaders, std::string headerName)
    {
        std::string line;

        do
        {
            line = allHeaders.substr(0, allHeaders.find_first_of("\r\n"));
            if (line.find(headerName + ":") != std::string::npos)
            {
                std::string value = line.substr(headerName.size() + 1);

                while (value[0] == ' ' || value[0] == '\t' || value[0] == '\r' || value[0] == '\n')
                {
                    value = value.substr(1);
                }

                return value;
            }

            int newPos = allHeaders.find_first_of("\r\n");

            if (newPos != std::string::npos)
            {
                allHeaders = allHeaders.substr(newPos + 2);
            }
        } while (allHeaders.find("\r\n") != std::string::npos);

        return "";
    }
};