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parsing.rs
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parsing.rs
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use geoengine_datatypes::primitives::SpatialResolution;
use serde::de;
use serde::de::Error;
use serde::Deserialize;
use std::fmt;
use std::marker::PhantomData;
use std::str::FromStr;
use url::Url;
/// Parse the `SpatialResolution` of a request by parsing `x,y`, e.g. `0.1,0.1`.
pub fn parse_spatial_resolution<'de, D>(deserializer: D) -> Result<SpatialResolution, D::Error>
where
D: serde::Deserializer<'de>,
{
let s = String::deserialize(deserializer)?;
let split: Result<Vec<f64>, <f64 as FromStr>::Err> = s.split(',').map(f64::from_str).collect();
match split.as_ref().map(Vec::as_slice) {
Ok(&[x, y]) => SpatialResolution::new(x, y).map_err(D::Error::custom),
Err(error) => Err(D::Error::custom(error)),
Ok(..) => Err(D::Error::custom("Invalid spatial resolution")),
}
}
/// Parse a field as a string or array of strings. Always returns a `Vec<String>`.
pub fn string_or_string_array<'de, D>(deserializer: D) -> Result<Vec<String>, D::Error>
where
D: serde::Deserializer<'de>,
{
struct StringOrVec(PhantomData<Vec<String>>);
impl<'de> de::Visitor<'de> for StringOrVec {
type Value = Vec<String>;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("string or array of strings")
}
fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
where
E: de::Error,
{
Ok(vec![value.to_owned()])
}
fn visit_seq<S>(self, visitor: S) -> Result<Self::Value, S::Error>
where
S: de::SeqAccess<'de>,
{
Deserialize::deserialize(de::value::SeqAccessDeserializer::new(visitor))
}
}
deserializer.deserialize_any(StringOrVec(PhantomData))
}
/// Deserialize a base URL by enforcing a trailing slash and then parsing it as a URL.
pub fn deserialize_base_url<'de, D>(deserializer: D) -> Result<Url, D::Error>
where
D: serde::Deserializer<'de>,
{
let mut url_string = String::deserialize(deserializer)?;
if !url_string.ends_with('/') {
url_string.push('/');
}
Url::parse(&url_string).map_err(D::Error::custom)
}
/// Deserialize an optional base URL by enforcing a trailing slash and then parsing it as a URL.
pub fn deserialize_base_url_option<'de, D>(deserializer: D) -> Result<Option<Url>, D::Error>
where
D: serde::Deserializer<'de>,
{
let mut url_string = if let Some(url_string) = Option::<String>::deserialize(deserializer)? {
url_string
} else {
return Ok(None);
};
if !url_string.ends_with('/') {
url_string.push('/');
}
Url::parse(&url_string)
.map(Option::Some)
.map_err(D::Error::custom)
}
#[cfg(test)]
mod tests {
use std::fmt::Display;
use super::*;
#[test]
fn test_deserialize_base_url() {
#[derive(Deserialize)]
struct Test {
#[serde(deserialize_with = "deserialize_base_url")]
base_url: Url,
}
impl Display for Test {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(&self.base_url.to_string())
}
}
assert_eq!(
serde_json::from_str::<Test>(r#"{"base_url": "https://www.endpoint.de/"}"#)
.unwrap()
.to_string(),
"https://www.endpoint.de/"
);
assert_eq!(
serde_json::from_str::<Test>(r#"{"base_url": "https://www.endpoint.de"}"#)
.unwrap()
.to_string(),
"https://www.endpoint.de/"
);
assert!(serde_json::from_str::<Test>(r#"{"base_url": "foo"}"#).is_err());
}
#[test]
fn test_deserialize_base_url_option() {
#[derive(Deserialize)]
struct Test {
#[serde(deserialize_with = "deserialize_base_url_option")]
base_url: Option<Url>,
}
impl Display for Test {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match &self.base_url {
Some(base_url) => f.write_str(base_url.as_ref()),
None => f.write_str(""),
}
}
}
assert_eq!(
serde_json::from_str::<Test>(r#"{"base_url": "https://www.endpoint.de/"}"#)
.unwrap()
.to_string(),
"https://www.endpoint.de/"
);
assert_eq!(
serde_json::from_str::<Test>(r#"{"base_url": "https://www.endpoint.de"}"#)
.unwrap()
.to_string(),
"https://www.endpoint.de/"
);
assert!(serde_json::from_str::<Test>(r#"{"base_url": "foo"}"#).is_err());
assert_eq!(
serde_json::from_str::<Test>(r#"{"base_url": null}"#)
.unwrap()
.to_string(),
""
);
}
}