http_utilities 0.1.2

a simple, lightweight library that handles http requests
Documentation 
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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183

/// seperates the subadress from http request
pub fn slice_subaddress(buffer: String) -> String {
    let mut result = String::new();
    for c in buffer.chars() {
        if c == '\n' {
            break;
        } else {
            result.push(c);
        }
    }

    return result
        .split_whitespace()
        .skip(1)
        .next()
        .unwrap()
        .replace("/", "")
        .to_string();
}

/// generates html code, that reconnects the user to the input url
pub fn redirect(url: String) -> String {
    format!(
        "HTTP/1.1 200 OK\r\n\r\n<!DOCTYPE html>\n<html lang=\"en\">\n\n<head>\n <meta charset=\"utf-8\">\n<title>Redirecting...</title>\n<meta http-equiv=\"refresh\" content=\"0; URL='{}'\" /></head>",
        url
    )
}

pub enum HttpMethod {
    NONE,
    GET,
    HEAD,
    PUT,
    POST,
    PATCH,
    DELETE,
    CONNECT,
    OPTIONS,
    TRACE,
}

/// parses the http method by reading the first two chars
pub fn parse_http_method_unsafe(input: &[u8; 1024]) -> HttpMethod {
    match input[0].to_ascii_uppercase() {
        b'G' => return HttpMethod::GET,
        b'H' => return HttpMethod::HEAD,
        b'D' => return HttpMethod::DELETE,
        b'C' => return HttpMethod::CONNECT,
        b'O' => return HttpMethod::OPTIONS,
        b'T' => return HttpMethod::TRACE,
        b'P' => match input[1] {
            b'U' => return HttpMethod::PUT,
            b'O' => return HttpMethod::POST,
            b'A' => return HttpMethod::PATCH,
            _ => return HttpMethod::NONE,
        },
        _ => return HttpMethod::NONE,
    };
}

/// parses the http method by comparing the whole method specifier instead of just the first two chars
pub fn parse_http_method_safe(input: &[u8; 1024]) -> HttpMethod {
    match input[0] {
        b'G' => {
            if input.starts_with(b"GET ") {
                return HttpMethod::GET;
            }
        }
        b'H' => {
            if input.starts_with(b"HEAD") {
                return HttpMethod::HEAD;
            }
        }
        b'D' => {
            if input.starts_with(b"DELETE") {
                return HttpMethod::DELETE;
            }
        }
        b'C' => {
            if input.starts_with(b"CONNECT") {
                return HttpMethod::CONNECT;
            }
        }
        b'O' => {
            if input.starts_with(b"OPTIONS") {
                return HttpMethod::OPTIONS;
            }
        }
        b'T' => {
            if input.starts_with(b"TRACE") {
                return HttpMethod::TRACE;
            }
        }
        b'P' => match input[1].to_ascii_uppercase() {
            b'U' => {
                if input.starts_with(b"PUT") {
                    return HttpMethod::PUT;
                }
            }
            b'O' => {
                if input.starts_with(b"POST") {
                    return HttpMethod::POST;
                }
            }
            b'A' => {
                if input.starts_with(b"PATCH") {
                    return HttpMethod::PATCH;
                }
            }
            _ => return HttpMethod::NONE,
        },
        _ => return HttpMethod::NONE,
    };
    return HttpMethod::NONE;
}

#[cfg(test)]
fn parse_http_method_unsafe_test() {
    // array of tripel (&str, &str, &str)
    // ("<testinput>", "<expected output of parse_http_method_UNsafe>", "<expected output of parse_http_method_safe>")
    let tests = [
        ("POST /", "post", "post"),
        ("PO ", "post", "none"),
        ("PUT /index", "put", "put"),
        ("PU", "put", "none"),
        ("OPTIONS ", "options", "options"),
        ("OP", "options", "none"),
        ("fhufqwvz87q", "none", "none"),
        ("PORTWINE IS DELICOUS", "post", "none"),
        ("post", "post", "none"),
    ];

    for i in 0..6 {
        assert_eq!(
            http_method_to_string(parse_http_method_unsafe(&parse_http_method_test_helper(
                tests[i].0.to_string()
            ))),
            tests[i].1
        );
    }

    for i in 0..6 {
        assert_eq!(
            http_method_to_string(parse_http_method_safe(&parse_http_method_test_helper(
                tests[i].0.to_string()
            ))),
            tests[i].2
        );
    }
}

#[cfg(test)]
fn parse_http_method_test_helper(input_string: String) -> [u8; 1024] {
    let input_string: &[u8] = input_string.as_bytes();
    let mut out = [0; 1024];

    for i in 0..input_string.len() {
        out[i] = input_string[i];
    }
    out
}

#[cfg(test)]
fn http_method_to_string(input: HttpMethod) -> String {
    let out = match input {
        HttpMethod::CONNECT => "connect",
        HttpMethod::DELETE => "delete",
        HttpMethod::GET => "get",
        HttpMethod::HEAD => "head",
        HttpMethod::NONE => "none",
        HttpMethod::OPTIONS => "options",
        HttpMethod::PATCH => "patcg",
        HttpMethod::POST => "post",
        HttpMethod::PUT => "put",
        HttpMethod::TRACE => "trace",
    };
    out.to_string()
}

#[test]
fn test() {
    parse_http_method_unsafe_test();
}