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

use std::str::FromStr;

use crate::{mime::Mime, MultipartFormDataType, Repetition};

const DEFAULT_IN_MEMORY_DATA_LIMIT: u64 = 1024 * 1024;
const DEFAULT_FILE_DATA_LIMIT: u64 = 8 * 1024 * 1024;

/// The guarder for fields.
#[derive(Debug, Clone)]
pub struct MultipartFormDataField<'a> {
    /// The type of this field.
    pub typ:          MultipartFormDataType,
    /// The name of this field.
    pub field_name:   &'a str,
    /// The size limit for this field.
    pub size_limit:   u64,
    /// To filter the content types. It supports stars.
    pub content_type: Option<Vec<Mime>>,
    /// To define this `MultipartFormDataField` instance can be used how many times.
    pub repetition:   Repetition,
}

impl<'a> MultipartFormDataField<'a> {
    /// Create a text field, the default size_limit is 1 MiB.
    #[inline]
    pub fn text<S: ?Sized + AsRef<str>>(field_name: &S) -> MultipartFormDataField {
        MultipartFormDataField {
            typ:          MultipartFormDataType::Text,
            field_name:   field_name.as_ref(),
            size_limit:   DEFAULT_IN_MEMORY_DATA_LIMIT,
            content_type: None,
            repetition:   Repetition::default(),
        }
    }

    /// Create a raw field, the default size_limit is 1 MiB.
    #[inline]
    pub fn bytes<S: ?Sized + AsRef<str>>(field_name: &S) -> MultipartFormDataField {
        Self::raw(field_name.as_ref())
    }

    /// Create a raw field, the default size_limit is 1 MiB.
    #[inline]
    pub fn raw<S: ?Sized + AsRef<str>>(field_name: &S) -> MultipartFormDataField {
        MultipartFormDataField {
            typ:          MultipartFormDataType::Raw,
            field_name:   field_name.as_ref(),
            size_limit:   DEFAULT_IN_MEMORY_DATA_LIMIT,
            content_type: None,
            repetition:   Repetition::default(),
        }
    }

    /// Create a file field, the default size_limit is 8 MiB.
    #[inline]
    pub fn file<S: ?Sized + AsRef<str>>(field_name: &S) -> MultipartFormDataField {
        MultipartFormDataField {
            typ:          MultipartFormDataType::File,
            field_name:   field_name.as_ref(),
            size_limit:   DEFAULT_FILE_DATA_LIMIT,
            content_type: None,
            repetition:   Repetition::default(),
        }
    }

    /// Set the size_limit for this field.
    #[inline]
    pub fn size_limit(mut self, size_limit: u64) -> MultipartFormDataField<'a> {
        self.size_limit = size_limit;
        self
    }

    /// Add a content type filter for this field. This method can be used multiple times to use multiple content type filters.
    #[inline]
    pub fn content_type(mut self, content_type: Option<Mime>) -> MultipartFormDataField<'a> {
        match content_type {
            Some(content_type) => match self.content_type.as_mut() {
                Some(v) => {
                    v.push(content_type);
                },
                None => {
                    self.content_type = Some(vec![content_type]);
                },
            },
            None => self.content_type = None,
        }
        self
    }

    /// Add a content type filter for this field. This method can be used multiple times to use multiple content type filters.
    #[inline]
    pub fn content_type_by_string<S: AsRef<str>>(
        mut self,
        content_type: Option<S>,
    ) -> Result<MultipartFormDataField<'a>, mime::FromStrError> {
        match content_type {
            Some(content_type) => {
                let content_type = Mime::from_str(content_type.as_ref())?;
                match self.content_type.as_mut() {
                    Some(v) => {
                        v.push(content_type);
                    },
                    None => {
                        self.content_type = Some(vec![content_type]);
                    },
                }
            },
            None => self.content_type = None,
        }
        Ok(self)
    }

    /// Set the repetition for this field.
    #[inline]
    pub fn repetition(mut self, repetition: Repetition) -> MultipartFormDataField<'a> {
        self.repetition = repetition;
        self
    }
}