move case_insensitive_deserialize to azure_core::util (#453)

Author: bmc-msft

sdk/core/src/util.rs

@@ -1,6 +1,11 @@
 use bytes::Bytes;
 use http::header::{AsHeaderName, HeaderMap, HeaderName, HeaderValue};
 use http::{self, request::Builder};
+use serde::{
+    de::{self, DeserializeOwned, Deserializer},
+    Deserialize,
+};
+
 use std::{convert::TryFrom, fmt::Display, str::FromStr};
 
 pub fn format_header_value<D: Display>(value: D) -> Result<HeaderValue, http::Error> {
@@ -102,6 +107,17 @@ pub fn slice_bom(bytes: &Bytes) -> Bytes {
     }
 }
 
+pub fn case_insensitive_deserialize<'de, T, D>(deserializer: D) -> Result<T, D::Error>
+where
+    T: DeserializeOwned + std::fmt::Debug,
+    D: Deserializer<'de>,
+{
+    let v = String::deserialize(deserializer)?;
+    T::deserialize(serde_json::Value::String(v.clone()))
+        .or_else(|_| T::deserialize(serde_json::Value::String(v.to_lowercase())))
+        .map_err(de::Error::custom)
+}
+
 #[cfg(test)]
 mod test {
     use super::*;

services/autorust/codegen/src/codegen_models.rs

@@ -30,8 +30,8 @@ pub fn create_models(cg: &CodeGen) -> Result<TokenStream, Error> {
     });
     if has_case_workaround {
         file.extend(quote! {
-        use serde::de::{self, Deserializer, DeserializeOwned};
-        })
+        use azure_core::util::case_insensitive_deserialize;
+        });
     }
 
     let mut all_schemas: IndexMap<RefKey, ResolvedSchema> = IndexMap::new();
@@ -57,18 +57,6 @@ pub fn create_models(cg: &CodeGen) -> Result<TokenStream, Error> {
         }
     }
 
-    if has_case_workaround {
-        file.extend(quote! {
-            fn case_insensitive<'de, T, D>(deserializer: D) -> Result<T, D::Error>
-            where T: DeserializeOwned + std::fmt::Debug,
-                  D: Deserializer<'de>
-        {
-            let v = String::deserialize(deserializer)?;
-            T::deserialize(serde_json::Value::String(v.clone())).or_else(|_| T::deserialize(serde_json::Value::String(v.to_lowercase()))).map_err(de::Error::custom)
-        }
-            });
-    }
-
     let mut schema_names = IndexMap::new();
     for (ref_key, schema) in &all_schemas {
         let doc_file = &ref_key.file_path;
@@ -231,7 +219,7 @@ fn create_struct(cg: &CodeGen, doc_file: &Path, struct_name: &str, schema: &Reso
             }
         }
         if is_local_enum(property) && lowercase_workaround {
-            serde_attrs.push(quote! { deserialize_with = "case_insensitive"});
+            serde_attrs.push(quote! { deserialize_with = "case_insensitive_deserialize"});
         }
         let serde = if !serde_attrs.is_empty() {
             quote! { #[serde(#(#serde_attrs),*)] }