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use crate::message::{
IntoBody, SinglePart,
header::{self, ContentType},
};
/// `SinglePart` builder for attachments
///
/// Allows building attachment parts easily.
#[derive(Clone)]
pub struct Attachment {
disposition: Disposition,
}
#[derive(Clone)]
enum Disposition {
/// File name
Attached(String),
/// Content id
Inline {
content_id: String,
name: Option<String>,
},
}
impl Attachment {
/// Create a new attachment
///
/// This attachment will be displayed as a normal attachment,
/// with the chosen `filename` appearing as the file name.
///
/// ```rust
/// # use std::error::Error;
/// use std::fs;
///
/// use lettre::message::{Attachment, header::ContentType};
///
/// # fn main() -> Result<(), Box<dyn Error>> {
/// let filename = String::from("invoice.pdf");
/// # if false {
/// let filebody = fs::read("invoice.pdf")?;
/// # }
/// # let filebody = fs::read("docs/lettre.png")?;
/// let content_type = ContentType::parse("application/pdf").unwrap();
/// let attachment = Attachment::new(filename).body(filebody, content_type);
///
/// // The document `attachment` will show up as a normal attachment.
/// # Ok(())
/// # }
/// ```
pub fn new(filename: String) -> Self {
Attachment {
disposition: Disposition::Attached(filename),
}
}
/// Create a new inline attachment
///
/// This attachment should be displayed inline into the message
/// body:
///
/// ```html
/// <img src="cid:123">
/// ```
///
///
/// ```rust
/// # use std::error::Error;
/// use std::fs;
///
/// use lettre::message::{Attachment, header::ContentType};
///
/// # fn main() -> Result<(), Box<dyn Error>> {
/// let content_id = String::from("123");
/// # if false {
/// let filebody = fs::read("image.jpg")?;
/// # }
/// # let filebody = fs::read("docs/lettre.png")?;
/// let content_type = ContentType::parse("image/jpeg").unwrap();
/// let attachment = Attachment::new_inline(content_id).body(filebody, content_type);
///
/// // The image `attachment` will display inline into the email.
/// # Ok(())
/// # }
/// ```
pub fn new_inline(content_id: String) -> Self {
Attachment {
disposition: Disposition::Inline {
content_id,
name: None,
},
}
}
/// Create a new inline attachment giving it a name
///
/// This attachment should be displayed inline into the message
/// body:
///
/// ```html
/// <img src="cid:123">
/// ```
///
///
/// ```rust
/// # use std::error::Error;
/// use std::fs;
///
/// use lettre::message::{Attachment, header::ContentType};
///
/// # fn main() -> Result<(), Box<dyn Error>> {
/// let content_id = String::from("123");
/// let file_name = String::from("image.jpg");
/// # if false {
/// let filebody = fs::read(&file_name)?;
/// # }
/// # let filebody = fs::read("docs/lettre.png")?;
/// let content_type = ContentType::parse("image/jpeg").unwrap();
/// let attachment =
/// Attachment::new_inline_with_name(content_id, file_name).body(filebody, content_type);
///
/// // The image `attachment` will display inline into the email.
/// # Ok(())
/// # }
/// ```
pub fn new_inline_with_name(content_id: String, name: String) -> Self {
Attachment {
disposition: Disposition::Inline {
content_id,
name: Some(name),
},
}
}
/// Build the attachment into a [`SinglePart`] which can then be used to build the rest of the email
///
/// Look at the [Complex MIME body example](crate::message#complex-mime-body)
/// to see how [`SinglePart`] can be put into the email.
pub fn body<T: IntoBody>(self, content: T, content_type: ContentType) -> SinglePart {
let mut builder = SinglePart::builder();
builder = match self.disposition {
Disposition::Attached(filename) => {
builder.header(header::ContentDisposition::attachment(&filename))
}
Disposition::Inline {
content_id,
name: None,
} => builder
.header(header::ContentId::from(format!("<{content_id}>")))
.header(header::ContentDisposition::inline()),
Disposition::Inline {
content_id,
name: Some(name),
} => builder
.header(header::ContentId::from(format!("<{content_id}>")))
.header(header::ContentDisposition::inline_with_name(&name)),
};
builder = builder.header(content_type);
builder.body(content)
}
}
#[cfg(test)]
mod tests {
use crate::message::header::ContentType;
#[test]
fn attachment() {
let part = super::Attachment::new(String::from("test.txt")).body(
String::from("Hello world!"),
ContentType::parse("text/plain").unwrap(),
);
assert_eq!(
&String::from_utf8_lossy(&part.formatted()),
concat!(
"Content-Disposition: attachment; filename=\"test.txt\"\r\n",
"Content-Type: text/plain\r\n",
"Content-Transfer-Encoding: 7bit\r\n\r\n",
"Hello world!\r\n",
)
);
}
#[test]
fn attachment_inline() {
let part = super::Attachment::new_inline(String::from("id")).body(
String::from("Hello world!"),
ContentType::parse("text/plain").unwrap(),
);
assert_eq!(
&String::from_utf8_lossy(&part.formatted()),
concat!(
"Content-ID: <id>\r\n",
"Content-Disposition: inline\r\n",
"Content-Type: text/plain\r\n",
"Content-Transfer-Encoding: 7bit\r\n\r\n",
"Hello world!\r\n"
)
);
}
#[test]
fn attachment_inline_with_name() {
let id = String::from("id");
let name = String::from("test");
let part = super::Attachment::new_inline_with_name(id, name).body(
String::from("Hello world!"),
ContentType::parse("text/plain").unwrap(),
);
assert_eq!(
&String::from_utf8_lossy(&part.formatted()),
concat!(
"Content-ID: <id>\r\n",
"Content-Disposition: inline; filename=\"test\"\r\n",
"Content-Type: text/plain\r\n",
"Content-Transfer-Encoding: 7bit\r\n\r\n",
"Hello world!\r\n"
)
);
}
}