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use azure_core::error::{Error, ErrorKind, ResultExt};
use azure_core::headers::{self, Header, PROPERTIES};
use http::HeaderMap;
use std::borrow::Cow;
use std::collections::BTreeMap;
use std::convert::TryFrom;
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Properties(BTreeMap<Cow<'static, str>, Cow<'static, str>>);
impl Default for Properties {
fn default() -> Self {
Self::new()
}
}
impl Properties {
pub fn new() -> Self {
Self(BTreeMap::new())
}
pub fn insert<K: Into<Cow<'static, str>>, V: Into<Cow<'static, str>>>(
&mut self,
k: K,
v: V,
) -> Option<Cow<'static, str>> {
self.0.insert(k.into(), v.into())
}
pub fn get(&self, key: &str) -> std::option::Option<&Cow<'_, str>> {
self.0.get(key)
}
}
impl Header for Properties {
fn name(&self) -> headers::HeaderName {
PROPERTIES.into()
}
fn value(&self) -> headers::HeaderValue {
// the header is a comma separated list of key=base64(value) see
// [https://docs.microsoft.com/rest/api/storageservices/datalakestoragegen2/filesystem/create#request-headers](https://docs.microsoft.com/rest/api/storageservices/datalakestoragegen2/filesystem/create#request-headers)
self.0
.iter()
.map(|(k, v)| format!("{}={}", k.as_ref(), base64::encode(v.as_ref())))
.collect::<Vec<_>>()
.join(",")
.into()
}
}
impl TryFrom<&HeaderMap> for Properties {
type Error = crate::Error;
fn try_from(headers: &HeaderMap) -> Result<Self, Self::Error> {
let header_value = headers
.get(PROPERTIES)
.ok_or_else(|| Error::message(ErrorKind::Other, PROPERTIES.to_owned()))?
.to_str()
.map_kind(ErrorKind::DataConversion)?;
Properties::try_from(header_value)
}
}
impl TryFrom<&str> for Properties {
type Error = crate::Error;
fn try_from(header_value: &str) -> Result<Self, Self::Error> {
let mut properties = Self::new();
if header_value.is_empty() {
return Ok(properties);
}
// this is probably too complicated. Should we split
// it in more manageable code blocks?
// The logic is this:
// 1. Look for the header. If not found return error
// 2. Split the header value by comma
// 3. For each comma separated value:
// 4. Split by equals. If we do not have at least 2 entries, return error.
// 5. For each pair:
// 6. Base64 decode the second entry (value). If error, return error.
// 7. Insert the key value pair in the returned struct.
header_value
.split(',') // The list is a CSV so we split by comma
.map(|key_value_pair| {
let mut key_and_value = key_value_pair.split('='); // Each entry is key and value separated by =
// we must have a key and a value (so two entries)
let key = key_and_value
.next()
.ok_or_else(|| Error::message(ErrorKind::Other, "missing key"))?;
let value = key_and_value
.next()
.ok_or_else(|| Error::message(ErrorKind::Other, "missing value"))?;
// we do not check if there are more entries. We just ignore them.
Ok((key, value))
})
.collect::<crate::Result<Vec<(&str, &str)>>>()? // if we have an error, return error
.into_iter()
.map(|(key, value)| {
let value = std::str::from_utf8(
&base64::decode(value).map_kind(ErrorKind::DataConversion)?,
)?
.to_owned(); // the value is base64 encoded se we decode it
Ok((key, value))
})
.collect::<crate::Result<Vec<(&str, String)>>>()? // if we have an error, return error
.into_iter()
.for_each(|(key, value)| {
properties.insert(key.to_owned(), value); // finally store the key and value into the properties
});
Ok(properties)
}
}