Struct mail::Metadata

pub struct Metadata {
    pub file_meta: FileMeta,
    pub media_type: MediaType,
    pub content_id: MessageId,
}

POD type containing FileMeta, Content-Type and Content-Id

The file meta contains optional information like file name and read as well as last modification data.

The media type will be used for the content type header which is used to determine how a mail client will handle the file. It is also used to get a hint on how to best transfer encode the file.

The content id is used to identify the “data” and refer to it from some other place. For example in a mail the html body could refer to a image contained in the mail to embed it in the mail.

As Content-Id’s are supposed to be world unique they could also be used for some caching and similar but that plays hardly any role any more, except maybe for “external” mail bodies.

Fields

file_meta: FileMeta

File meta like file name or file read time.

media_type: MediaType

The media type of the data.

content_id: MessageId

The content id associated with the data.

Methods from Deref<Target = FileMeta>

pub fn replace_empty_fields_with(&mut self, other_meta: &FileMeta)

Replaces all fields which are None with the value of the field in other_meta.

Trait Implementations

impl Clone for Metadata

fn clone(&self) -> Metadata

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Metadata

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Deref for Metadata

type Target = FileMeta

The resulting type after dereferencing.

fn deref(&self) -> &<Metadata as Deref>::Target

Dereferences the value.

impl DerefMut for Metadata

fn deref_mut(&mut self) -> &mut <Metadata as Deref>::Target

Mutably dereferences the value.

impl<'de> Deserialize<'de> for Metadata

fn deserialize<__D>(
    __deserializer: __D
) -> Result<Metadata, <__D as Deserializer<'de>>::Error>where
    __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Metadata

fn serialize<__S>(
    &self,
    __serializer: __S
) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>where
    __S: Serializer,

Serialize this value into the given Serde serializer.