[Storage] Add StorageError model type

sdk/storage/azure_storage_blob/src/models/extensions.rs

@@ -5,7 +5,6 @@ use crate::models::{
     AppendBlobClientCreateOptions, BlobTag, BlobTags, BlockBlobClientUploadBlobFromUrlOptions,
     BlockBlobClientUploadOptions, PageBlobClientCreateOptions,
 };
-use azure_core::error::ErrorKind;
 use std::collections::HashMap;
 
 /// Augments the current options bag to only create if the Page blob does not already exist.

sdk/storage/azure_storage_blob/src/models/mod.rs

@@ -2,6 +2,7 @@
 // Licensed under the MIT License.
 
 mod extensions;
+mod storage_error;
 
 pub use crate::generated::models::{
     AccessTier, AccountKind, AppendBlobClientAppendBlockFromUrlOptions,
@@ -83,3 +84,4 @@ pub use crate::generated::models::{
     VecSignedIdentifierHeaders,
 };
 pub use extensions::*;
+pub use storage_error::StorageError;

sdk/storage/azure_storage_blob/src/models/storage_error.rs

@@ -0,0 +1,243 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+use crate::generated::models::StorageErrorCode;
+use azure_core::error::ErrorKind;
+use azure_core::http::RawResponse;
+use serde::Deserialize;
+use serde_json::Value;
+use std::collections::HashMap;
+
+/// Represents an error response from Azure Storage services.
+#[derive(Debug, Clone)]
+pub struct StorageError {
+    /// The HTTP status code.
+    pub status_code: azure_core::http::StatusCode,
+    /// The Storage error code, if available.
+    pub error_code: Option<StorageErrorCode>,
+    /// The error message, if available.
+    pub message: Option<String>,
+    /// The request ID from the x-ms-request-id header, if available.
+    pub request_id: Option<String>,
+    /// The raw HTTP response.
+    pub raw_response: RawResponse,
+    /// Additional fields from the error response that weren't explicitly mapped.
+    pub additional_error_info: HashMap<String, String>,
+}
+
+impl StorageError {
+    pub fn status_code(&self) -> azure_core::http::StatusCode {
+        self.status_code
+    }
+
+    pub fn error_code(&self) -> Option<&StorageErrorCode> {
+        self.error_code.as_ref()
+    }
+
+    pub fn message(&self) -> Option<&str> {
+        self.message.as_deref()
+    }
+
+    pub fn request_id(&self) -> Option<&str> {
+        self.request_id.as_deref()
+    }
+
+    pub fn raw_response(&self) -> &RawResponse {
+        &self.raw_response
+    }
+
+    pub fn additional_error_info(&self) -> &HashMap<String, String> {
+        &self.additional_error_info
+    }
+
+    /// Converts a `serde_json::Value` to a String representation, handling nested XML structures.
+    fn value_to_string(value: &Value) -> String {
+        match value {
+            // Handle null values
+            Value::Null => "null".to_string(),
+
+            // Handle boolean values
+            Value::Bool(b) => b.to_string(),
+
+            // Handle numeric values
+            Value::Number(n) => n.to_string(),
+
+            // Handle string values
+            Value::String(s) => s.clone(),
+
+            // Handle arrays
+            Value::Array(arr) => {
+                let elements: Vec<String> = arr.iter().map(Self::value_to_string).collect();
+                format!("[{}]", elements.join(", "))
+            }
+
+            // Handle objects (including XML elements with $text)
+            Value::Object(obj) => {
+                // Special case: if the object only has a "$text" field, extract it
+                if obj.len() == 1 && obj.contains_key("$text") {
+                    if let Some(Value::String(text)) = obj.get("$text") {
+                        return text.clone();
+                    }
+                }
+
+                // For other objects, format as key-value pairs
+                let pairs: Vec<String> = obj
+                    .iter()
+                    .map(|(k, v)| {
+                        // Skip $text key in compound objects to avoid duplication
+                        if k == "$text" {
+                            Self::value_to_string(v)
+                        } else {
+                            format!("{}: {}", k, Self::value_to_string(v))
+                        }
+                    })
+                    .collect();
+
+                // If it's a single element (after filtering), return it directly
+                if pairs.len() == 1 {
+                    pairs[0].clone()
+                } else {
+                    format!("{{{}}}", pairs.join(", "))
+                }
+            }
+        }
+    }
+
+    /// Deserializes a `StorageError` from XML body with HTTP response metadata.
+    fn from_xml(
+        xml_body: &[u8],
+        status_code: azure_core::http::StatusCode,
+        raw_response: RawResponse,
+    ) -> Result<Self, azure_core::Error> {
+        #[derive(Deserialize)]
+        #[serde(rename = "Error")]
+        struct StorageErrorXml {
+            #[serde(rename = "Code")]
+            code: Option<String>,
+            #[serde(rename = "Message")]
+            message: Option<String>,
+            #[serde(flatten)]
+            additional_fields: HashMap<String, Value>,
+        }
+
+        let xml_fields = azure_core::xml::read_xml::<StorageErrorXml>(xml_body)?;
+
+        // Parse error code from XML body
+        let error_code = xml_fields.code.and_then(|code| {
+            code.parse()
+                .ok()
+                .or(Some(StorageErrorCode::UnknownValue(code)))
+        });
+
+        let request_id = raw_response.headers().get_optional_string(
+            &azure_core::http::headers::HeaderName::from_static("x-ms-request-id"),
+        );
+
+        // Convert additional fields from HashMap<String, Value> to HashMap<String, String>
+        let additional_error_info = xml_fields
+            .additional_fields
+            .iter()
+            .map(|(k, v)| (k.clone(), Self::value_to_string(v)))
+            .collect();
+
+        Ok(StorageError {
+            status_code,
+            error_code,
+            message: xml_fields.message,
+            request_id,
+            raw_response,
+            additional_error_info,
+        })
+    }
+}
+
+impl TryFrom<azure_core::Error> for StorageError {
+    type Error = azure_core::Error;
+
+    fn try_from(error: azure_core::Error) -> Result<Self, Self::Error> {
+        match error.kind() {
+            ErrorKind::HttpResponse {
+                status,
+                error_code,
+                raw_response,
+            } => {
+                let raw_response = raw_response.as_ref().ok_or_else(|| {
+                    azure_core::Error::with_message(
+                        azure_core::error::ErrorKind::DataConversion,
+                        "Cannot convert to StorageError: raw_response is missing.",
+                    )
+                })?;
+
+                let body = raw_response.body();
+
+                // No XML Body, Use Error Code from HttpResponse
+
+                // TODO: Need to figure out how to extract the message, seems like it's getting dropped somewhere when azure_core::Error model is created
+                // i.e. Captured Response from Over The Wire:
+                // HTTP/1.1 404 The specified blob does not exist. <---- This is getting dropped, I don't see it in Error or HttpResponse debug outputs
+                // Transfer-Encoding: chunked
+                // Server: Windows-Azure-Blob/1.0 Microsoft-HTTPAPI/2.0
+                // x-ms-request-id: xxxx
+                // x-ms-client-request-id: xxxxxx
+                // x-ms-version: 2025-11-05
+                // x-ms-error-code: BlobNotFound
+                // Date: Fri, 10 Oct 2025 22:55:41 GMT
+
+                if body.is_empty() {
+                    let error_code = error_code.as_ref().and_then(|code| {
+                        code.parse()
+                            .ok()
+                            .or(Some(StorageErrorCode::UnknownValue(code.clone())))
+                    });
+
+                    let request_id = raw_response.as_ref().clone().headers().get_optional_string(
+                        &azure_core::http::headers::HeaderName::from_static("x-ms-request-id"),
+                    );
+
+                    return Ok(StorageError {
+                        status_code: *status,
+                        error_code,
+                        message: None,
+                        request_id,
+                        raw_response: raw_response.as_ref().clone(),
+                        additional_error_info: HashMap::new(),
+                    });
+                }
+
+                StorageError::from_xml(body, *status, raw_response.as_ref().clone())
+            }
+            // TODO: We may have to handle other ErrorKind variants, but catch-all for now.
+            _ => Err(azure_core::Error::with_message(
+                azure_core::error::ErrorKind::DataConversion,
+                "ErrorKind was not HttpResponse and could not be parsed.",
+            )),
+        }
+    }
+}
+
+impl std::fmt::Display for StorageError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        writeln!(f, "HTTP Status Code: {}", self.status_code)?;
+
+        if let Some(request_id) = &self.request_id {
+            writeln!(f, "Request ID: {}", request_id)?;
+        }
+
+        if let Some(error_code) = &self.error_code {
+            writeln!(f, "Storage Error Code: {}", error_code)?;
+        }
+
+        if let Some(message) = &self.message {
+            writeln!(f, "Error Message: {}", message)?;
+        }
+
+        if !self.additional_error_info.is_empty() {
+            writeln!(f, "\nAdditional Error Info:")?;
+            for (key, value) in &self.additional_error_info {
+                writeln!(f, "{}: {}", key, value)?;
+            }
+        }
+
+        Ok(())
+    }
+}

sdk/storage/azure_storage_blob/tests/blob_client.rs

@@ -2,6 +2,7 @@
 // Licensed under the MIT License.
 
 use azure_core::{
+    error::ErrorKind,
     http::{RequestContent, StatusCode},
     Bytes,
 };
@@ -12,7 +13,7 @@ use azure_storage_blob::models::{
     BlobClientGetAccountInfoResultHeaders, BlobClientGetPropertiesOptions,
     BlobClientGetPropertiesResultHeaders, BlobClientSetMetadataOptions,
     BlobClientSetPropertiesOptions, BlobClientSetTierOptions, BlockBlobClientUploadOptions,
-    LeaseState,
+    LeaseState, StorageError,
 };
 
 use azure_storage_blob_test::{create_test_blob, get_blob_name, get_container_client};
@@ -480,3 +481,88 @@ async fn test_get_account_info(ctx: TestContext) -> Result<(), Box<dyn Error>> {
 
     Ok(())
 }
+
+#[recorded::test]
+async fn test_storage_error_model(ctx: TestContext) -> Result<(), Box<dyn Error>> {
+    // Recording Setup
+    let recording = ctx.recording();
+    let container_client = get_container_client(recording, true).await?;
+    let blob_client = container_client.blob_client(get_blob_name(recording));
+
+    // Act
+    let response = blob_client.download(None).await;
+    let error_response = response.unwrap_err();
+
+    let error_kind = error_response.kind();
+    assert!(matches!(error_kind, ErrorKind::HttpResponse { .. }));
+
+    let storage_error: StorageError = error_response.try_into()?;
+
+    println!("{}", storage_error);
+
+    Ok(())
+}
+
+#[recorded::test]
+async fn test_bodyless_storage_error_model(ctx: TestContext) -> Result<(), Box<dyn Error>> {
+    // Recording Setup
+    let recording = ctx.recording();
+    let container_client = get_container_client(recording, true).await?;
+    let blob_client = container_client.blob_client(get_blob_name(recording));
+
+    // Act
+    let response = blob_client.get_properties(None).await;
+    let error_response = response.unwrap_err();
+
+    let error_kind = error_response.kind();
+    assert!(matches!(error_kind, ErrorKind::HttpResponse { .. }));
+
+    let storage_error: StorageError = error_response.try_into()?;
+
+    println!("{}", storage_error);
+
+    Ok(())
+}
+
+#[recorded::test]
+async fn test_additional_storage_info_parsing(ctx: TestContext) -> Result<(), Box<dyn Error>> {
+    // Recording Setup
+    let recording = ctx.recording();
+    let container_client = get_container_client(recording, true).await?;
+    let source_blob_client = container_client.blob_client(get_blob_name(recording));
+    create_test_blob(&source_blob_client, None, None).await?;
+
+    let blob_client = container_client.blob_client(get_blob_name(recording));
+
+    let overwrite_blob_client = container_client.blob_client(get_blob_name(recording));
+    create_test_blob(
+        &overwrite_blob_client,
+        Some(RequestContent::from(b"overruled!".to_vec())),
+        None,
+    )
+    .await?;
+
+    // Inject an erroneous 'c' so we raise Copy Source Errors
+    let overwrite_url = format!(
+        "{}{}c/{}",
+        overwrite_blob_client.endpoint(),
+        overwrite_blob_client.container_name(),
+        overwrite_blob_client.blob_name()
+    );
+
+    // Copy Source Error Scenario
+    let response = blob_client
+        .block_blob_client()
+        .upload_blob_from_url(overwrite_url.clone(), None)
+        .await;
+    // Assert
+    let error = response.unwrap_err();
+    assert_eq!(StatusCode::NotFound, error.http_status().unwrap());
+
+    let storage_error: StorageError = error.try_into()?;
+
+    println!("{}", storage_error);
+
+    container_client.delete_container(None).await?;
+    Ok(())
+}