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use std::{
error::Error,
fmt::{Display, Formatter, Result as FmtResult},
};
#[allow(clippy::module_name_repetitions)]
#[derive(Clone, Debug, Eq, PartialEq)]
#[non_exhaustive]
pub enum ImageSourceAttachmentError {
ExtensionEmpty,
ExtensionMissing,
}
impl Display for ImageSourceAttachmentError {
fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
match self {
Self::ExtensionEmpty { .. } => f.write_str("the extension is empty"),
Self::ExtensionMissing { .. } => f.write_str("the extension is missing"),
}
}
}
impl Error for ImageSourceAttachmentError {}
#[allow(clippy::module_name_repetitions)]
#[derive(Clone, Debug, Eq, PartialEq)]
#[non_exhaustive]
pub enum ImageSourceUrlError {
ProtocolUnsupported {
url: String,
},
}
impl Display for ImageSourceUrlError {
fn fmt(&self, f: &mut Formatter<'_>) -> FmtResult {
match self {
Self::ProtocolUnsupported { .. } => {
f.write_str("the provided URL's protocol is unsupported by Discord")
}
}
}
}
impl Error for ImageSourceUrlError {}
#[derive(Clone, Debug, Eq, PartialEq)]
#[non_exhaustive]
pub struct ImageSource(pub(crate) String);
impl ImageSource {
pub fn attachment(filename: impl AsRef<str>) -> Result<Self, ImageSourceAttachmentError> {
Self::_attachment(filename.as_ref())
}
fn _attachment(filename: &str) -> Result<Self, ImageSourceAttachmentError> {
let dot = filename
.rfind('.')
.ok_or(ImageSourceAttachmentError::ExtensionMissing)?
+ 1;
if filename
.get(dot..)
.ok_or(ImageSourceAttachmentError::ExtensionMissing)?
.is_empty()
{
return Err(ImageSourceAttachmentError::ExtensionEmpty);
}
Ok(Self(format!("attachment://{}", filename)))
}
pub fn url(url: impl Into<String>) -> Result<Self, ImageSourceUrlError> {
Self::_url(url.into())
}
fn _url(url: String) -> Result<Self, ImageSourceUrlError> {
if !url.starts_with("https:") && !url.starts_with("http:") {
return Err(ImageSourceUrlError::ProtocolUnsupported { url });
}
Ok(Self(url))
}
}
#[cfg(test)]
mod tests {
use super::{ImageSource, ImageSourceAttachmentError, ImageSourceUrlError};
use static_assertions::{assert_fields, assert_impl_all};
use std::{error::Error, fmt::Debug};
assert_impl_all!(
ImageSourceAttachmentError: Clone,
Debug,
Error,
Eq,
PartialEq,
Send,
Sync
);
assert_impl_all!(
ImageSourceUrlError: Clone,
Debug,
Error,
Eq,
PartialEq,
Send,
Sync
);
assert_fields!(ImageSourceUrlError::ProtocolUnsupported: url);
assert_impl_all!(ImageSource: Clone, Debug, Eq, PartialEq, Send, Sync);
#[test]
fn test_attachment() -> Result<(), Box<dyn Error>> {
assert!(matches!(
ImageSource::attachment("abc").unwrap_err(),
ImageSourceAttachmentError::ExtensionMissing
));
assert!(matches!(
ImageSource::attachment("abc.").unwrap_err(),
ImageSourceAttachmentError::ExtensionEmpty
));
assert_eq!(
ImageSource::attachment("abc.png")?,
ImageSource("attachment://abc.png".to_owned()),
);
Ok(())
}
#[test]
fn test_url() -> Result<(), Box<dyn Error>> {
assert!(matches!(
ImageSource::url("ftp://example.com/foo").unwrap_err(),
ImageSourceUrlError::ProtocolUnsupported { url }
if url == "ftp://example.com/foo"
));
assert_eq!(
ImageSource::url("https://example.com")?,
ImageSource("https://example.com".to_owned()),
);
assert_eq!(
ImageSource::url("http://example.com")?,
ImageSource("http://example.com".to_owned()),
);
Ok(())
}
}