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media_element: Switch to Into/TryFrom.

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This commit is contained in:
Emmanuel Gil Peyrot 2017-05-06 20:48:41 +01:00
parent 1ec3806629
commit 0dd0b444b3
2 changed files with 39 additions and 34 deletions
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5
src/data_forms.rs
View file

@ -4,6 +4,7 @@
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
use std::convert::TryFrom;
use std::str::FromStr;
use minidom::Element;
@ -11,7 +12,7 @@ use minidom::Element;
use error::Error;
use ns;
use media_element::{MediaElement, parse_media_element};
use media_element::MediaElement;
#[derive(Debug, Clone)]
pub struct Field {
@ -74,7 +75,7 @@ pub fn parse_data_form(root: &Element) -> Result<DataForm, Error> {
if element.is("value", ns::DATA_FORMS) {
values.push(element.text());
} else if element.is("media", ns::MEDIA_ELEMENT) {
match parse_media_element(element) {
match MediaElement::try_from(element) {
Ok(media_element) => media.push(media_element),
Err(_) => (), // TODO: is it really nice to swallow this error?
}

68
src/media_element.rs
View file

@ -4,6 +4,8 @@
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
use std::convert::TryFrom;
use minidom::Element;
use error::Error;
@ -23,40 +25,42 @@ pub struct MediaElement {
pub uris: Vec<URI>,
}
pub fn parse_media_element(root: &Element) -> Result<MediaElement, Error> {
if !root.is("media", ns::MEDIA_ELEMENT) {
return Err(Error::ParseError("This is not a media element."));
}
impl<'a> TryFrom<&'a Element> for MediaElement {
type Error = Error;
let width = root.attr("width").and_then(|width| width.parse().ok());
let height = root.attr("height").and_then(|height| height.parse().ok());
let mut uris = vec!();
for uri in root.children() {
if uri.is("uri", ns::MEDIA_ELEMENT) {
let type_ = uri.attr("type").ok_or(Error::ParseError("Attribute type on uri is mandatory."))?;
let text = uri.text().trim().to_owned();
if text == "" {
return Err(Error::ParseError("URI missing in uri."));
}
uris.push(URI { type_: type_.to_owned(), uri: text });
} else {
return Err(Error::ParseError("Unknown child in media element."));
fn try_from(elem: &'a Element) -> Result<MediaElement, Error> {
if !elem.is("media", ns::MEDIA_ELEMENT) {
return Err(Error::ParseError("This is not a media element."));
}
let width = elem.attr("width").and_then(|width| width.parse().ok());
let height = elem.attr("height").and_then(|height| height.parse().ok());
let mut uris = vec!();
for uri in elem.children() {
if uri.is("uri", ns::MEDIA_ELEMENT) {
let type_ = uri.attr("type").ok_or(Error::ParseError("Attribute type on uri is mandatory."))?;
let text = uri.text().trim().to_owned();
if text == "" {
return Err(Error::ParseError("URI missing in uri."));
}
uris.push(URI { type_: type_.to_owned(), uri: text });
} else {
return Err(Error::ParseError("Unknown child in media element."));
}
}
Ok(MediaElement { width: width, height: height, uris: uris })
}
Ok(MediaElement { width: width, height: height, uris: uris })
}
#[cfg(test)]
mod tests {
use minidom::Element;
use error::Error;
use media_element;
use super::*;
use data_forms;
#[test]
fn test_simple() {
let elem: Element = "<media xmlns='urn:xmpp:media-element'/>".parse().unwrap();
let media = media_element::parse_media_element(&elem).unwrap();
let media = MediaElement::try_from(&elem).unwrap();
assert!(media.width.is_none());
assert!(media.height.is_none());
assert!(media.uris.is_empty());
@ -65,7 +69,7 @@ mod tests {
#[test]
fn test_width_height() {
let elem: Element = "<media xmlns='urn:xmpp:media-element' width='32' height='32'/>".parse().unwrap();
let media = media_element::parse_media_element(&elem).unwrap();
let media = MediaElement::try_from(&elem).unwrap();
assert_eq!(media.width.unwrap(), 32);
assert_eq!(media.height.unwrap(), 32);
}
@ -73,7 +77,7 @@ mod tests {
#[test]
fn test_uri() {
let elem: Element = "<media xmlns='urn:xmpp:media-element'><uri type='text/html'>https://example.org/</uri></media>".parse().unwrap();
let media = media_element::parse_media_element(&elem).unwrap();
let media = MediaElement::try_from(&elem).unwrap();
assert_eq!(media.uris.len(), 1);
assert_eq!(media.uris[0].type_, "text/html");
assert_eq!(media.uris[0].uri, "https://example.org/");
@ -82,26 +86,26 @@ mod tests {
#[test]
fn test_invalid_width_height() {
let elem: Element = "<media xmlns='urn:xmpp:media-element' width=''/>".parse().unwrap();
let media = media_element::parse_media_element(&elem).unwrap();
let media = MediaElement::try_from(&elem).unwrap();
assert!(media.width.is_none());
let elem: Element = "<media xmlns='urn:xmpp:media-element' width='coucou'/>".parse().unwrap();
let media = media_element::parse_media_element(&elem).unwrap();
let media = MediaElement::try_from(&elem).unwrap();
assert!(media.width.is_none());
let elem: Element = "<media xmlns='urn:xmpp:media-element' height=''/>".parse().unwrap();
let media = media_element::parse_media_element(&elem).unwrap();
let media = MediaElement::try_from(&elem).unwrap();
assert!(media.height.is_none());
let elem: Element = "<media xmlns='urn:xmpp:media-element' height='-10'/>".parse().unwrap();
let media = media_element::parse_media_element(&elem).unwrap();
let media = MediaElement::try_from(&elem).unwrap();
assert!(media.height.is_none());
}
#[test]
fn test_unknown_child() {
let elem: Element = "<media xmlns='urn:xmpp:media-element'><coucou/></media>".parse().unwrap();
let error = media_element::parse_media_element(&elem).unwrap_err();
let error = MediaElement::try_from(&elem).unwrap_err();
let message = match error {
Error::ParseError(string) => string,
_ => panic!(),
@ -112,7 +116,7 @@ mod tests {
#[test]
fn test_bad_uri() {
let elem: Element = "<media xmlns='urn:xmpp:media-element'><uri>https://example.org/</uri></media>".parse().unwrap();
let error = media_element::parse_media_element(&elem).unwrap_err();
let error = MediaElement::try_from(&elem).unwrap_err();
let message = match error {
Error::ParseError(string) => string,
_ => panic!(),
@ -120,7 +124,7 @@ mod tests {
assert_eq!(message, "Attribute type on uri is mandatory.");
let elem: Element = "<media xmlns='urn:xmpp:media-element'><uri type='text/html'/></media>".parse().unwrap();
let error = media_element::parse_media_element(&elem).unwrap_err();
let error = MediaElement::try_from(&elem).unwrap_err();
let message = match error {
Error::ParseError(string) => string,
_ => panic!(),
@ -142,7 +146,7 @@ mod tests {
http://victim.example.com/challenges/speech.mp3?F3A6292C
</uri>
</media>"#.parse().unwrap();
let media = media_element::parse_media_element(&elem).unwrap();
let media = MediaElement::try_from(&elem).unwrap();
assert!(media.width.is_none());
assert!(media.height.is_none());
assert_eq!(media.uris.len(), 3);