flashapi 0.2.3

A lightweight webserver.
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

use crate::server::http::HttpMethod;
use percent_encoding::percent_decode_str;
use serde::Serialize;
use serde_json::Value;
use std::collections::HashMap;
use tokio::io::{AsyncBufReadExt, AsyncReadExt, BufReader};
use tokio::net::TcpStream;

#[derive(Debug, Serialize)]
pub struct QueryParams(HashMap<String, Vec<String>>);

impl QueryParams {
    pub fn get_one(&self, key: &str) -> Option<&str> {
        self.0.get(key)?.first().map(|s| s.as_str())
    }

    pub fn get_all(&self, key: &str) -> Option<&[String]> {
        self.0.get(key).map(|s| s.as_slice())
    }
}

#[derive(Debug)]
pub struct Request {
    pub body: Option<Value>,
    pub headers: HashMap<String, String>,
    pub method: HttpMethod,
    pub params: Option<HashMap<String, String>>,
    pub path: String,
    pub raw_body: Vec<u8>,
    pub query: Option<QueryParams>,
}

// ------------------------------------------------------------
// Calculate request query
// ------------------------------------------------------------
fn parse_query_multi(query: &str) -> QueryParams {
    let mut map = HashMap::new();

    for pair in query.split("&").filter(|p| !p.is_empty()) {
        let mut split = pair.split("=");

        let key = split.next().unwrap_or("");
        let value = split.next().unwrap_or("");

        let value = percent_decode_str(value).decode_utf8_lossy().to_string();

        map.entry(String::from(key))
            .or_insert_with(Vec::new)
            .push(value);
    }

    return QueryParams(map);
}

pub(crate) async fn get_request_info(stream: &mut TcpStream) -> Request {
    let mut buf_reader = BufReader::new(stream);
    let mut content_length = 0;

    let mut headers: HashMap<String, String> = HashMap::new();
    let mut request_line = String::new();

    // First line (e.g. GET /path HTTP/1.1)
    buf_reader.read_line(&mut request_line).await.unwrap();

    // ------------------------------------------------------------
    // Calculate request method
    // ------------------------------------------------------------
    dbg!(&request_line);
    let mut splits = request_line.split(" ");
    let request_method = splits.next().unwrap_or("");
    let method = match request_method {
        "DELETE" => HttpMethod::Delete,
        "GET" => HttpMethod::Get,
        "PATCH" => HttpMethod::Patch,
        "POST" => HttpMethod::Post,
        "PUT" => HttpMethod::Put,
        "HEAD" => HttpMethod::Head,
        "OPTIONS" => HttpMethod::Options,
        _ => HttpMethod::Get,
    };

    // ------------------------------------------------------------
    // Calculate request path
    // ------------------------------------------------------------
    let request_path_and_query = splits.next().unwrap_or("");
    let mut request_path_and_query_splits = request_path_and_query.split("?");
    let path = request_path_and_query_splits
        .next()
        .unwrap_or("")
        .to_string();

    // ------------------------------------------------------------
    // Calculate request query
    // ------------------------------------------------------------
    let query: Option<QueryParams> = match request_path_and_query_splits.next() {
        Some(query) => Some(parse_query_multi(query)),
        None => None,
    };

    // ------------------------------------------------------------
    // Calculate request headers
    // ------------------------------------------------------------
    loop {
        let mut line = String::new();
        buf_reader.read_line(&mut line).await.unwrap();

        if line == "\r\n" || line == "\n" {
            break;
        }

        if let Some((key, value)) = line.split_once(":") {
            headers.insert(key.trim().to_string(), value.trim().to_string());

            if key.to_lowercase() == "content-length" {
                content_length = value.trim().parse().unwrap_or(0);
            }
        }
    }

    // ------------------------------------------------------------
    // Calculate request body in JSON format
    // ------------------------------------------------------------
    let mut raw_body = vec![0; content_length];
    let mut body: Option<Value> = None;

    if content_length > 0 {
        let result = buf_reader.read_exact(&mut raw_body).await;
        if let Ok(_) = result {
            let body_str = String::from_utf8_lossy(&raw_body);
            body = serde_json::from_str(&body_str).unwrap();
        }
    }

    Request {
        body,
        headers,
        method,
        params: None,
        path,
        raw_body,
        query,
    }
}