Implemented reed-solomon erasure coding (encoding and decoding) with dynamically set amount of data shards and parity shards via config

Cargo.toml

@@ -0,0 +1,31 @@
+[workspace]
+resolver = "2"
+members = [
+    "src/stratum-core",
+    "src/stratum-storage",
+    "src/stratum-metadata",
+    "src/stratum-auth",
+    "src/stratum-api-s3",
+    "src/stratum-tiering",
+    "src/stratum",
+]
+
+[workspace.dependencies]
+axum = "0.8.8"
+bytes = "1.11.1"
+crc32fast = "1.5.0"
+hex = "0.4.3"
+hmac = "0.12.1"
+hyper = "1.8.1"
+md5 = "0.8.0"
+quick-xml = "0.39.2"
+reed-solomon-erasure = "6.0.0"
+serde = { version = "1.0.228", features = ["derive"] }
+sha2 = "0.10.9"
+sled = "0.34.7"
+tokio = "1.50.0"
+tower = "0.5.3"
+tracing = "0.1.44"
+tracing-subscriber = "0.3.23"
+uuid = { version = "1.22.0", features = ["v4"] }
+anyhow = "1.0.102"

LICENSE

@@ -1,18 +1,187 @@
-MIT License
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
 
-Copyright (c) 2026 gsh-digital-services
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
 
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and 
-associated documentation files (the "Software"), to deal in the Software without restriction, including 
-without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
-copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the 
-following conditions:
+   1. Definitions.
 
-The above copyright notice and this permission notice shall be included in all copies or substantial 
-portions of the Software.
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
 
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+          add Your own attribution notices within Derivative Works that You
+          distribute, alongside or as an addendum to the NOTICE text from
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+          be construed as modifying the License.
+
+      You may add Your own license statement for Your modifications and
+      may provide additional or different license terms and conditions for
+      use, reproduction, or distribution of Your modifications, or for such
+      Derivative Works as a whole, provided Your use, reproduction, and
+      distribution of the Work otherwise complies with the conditions stated
+      in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or agreed
+      to in writing, Licensor provides the Work (and each Contributor
+      provides its Contributions) on an "AS IS" BASIS, WITHOUT WARRANTIES
+      OR CONDITIONS OF ANY KIND, either express or implied, including,
+      without limitation, any warranties or conditions of TITLE,
+      NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR
+      PURPOSE. You are solely responsible for determining the
+      appropriateness of using or reproducing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or exemplary damages of any character arising as a result
+      of this License or out of the use or inability to use the Work
+      (including but not limited to damages for loss of goodwill, work
+      stoppage, computer failure or malfunction, or all other commercial
+      damages or losses), even if such Contributor has been advised of the
+      possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing the
+      Work or Derivative Works thereof, You may choose to offer, and charge
+      a fee for, acceptance of support, warranty, indemnity, or other
+      liability obligations and/or rights consistent with this License.
+      However, in accepting such obligations, You may offer only conditions
+      consistent with this License.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!) The text should be enclosed in the appropriate
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+      that a file be included in the same directory as the source files.
+
+   Copyright 2026 GSH Digital Services
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+   implied. See the License for the specific language governing
+   permissions and limitations under the License.

README.md

@@ -1,3 +1,199 @@
 # Stratum
 
-An S3-compatible object storage server written in Rust that autonomously moves objects between storage tiers based on observed access patterns, with optional developer-defined priority hints.
+> Self-optimizing, S3-compatible object storage with autonomous intelligent tiering — built for EU data sovereignty.
+
+---
+
+## What Is Stratum?
+
+Stratum is an open-source S3-compatible object storage server written in Rust. Unlike every other S3-compatible storage solution, Stratum autonomously moves objects between storage tiers (hot/warm/cold) based on observed access patterns — with zero configuration required.
+
+Point any S3-compatible client at it. It gets smarter over time.
+
+---
+
+## Why Stratum?
+
+| | AWS S3 Intelligent-Tiering | MinIO | Garage | **Stratum** |
+|---|---|---|---|---|
+| S3 compatible | ✅ | ✅ | ✅ | ✅ |
+| Autonomous tiering | ✅ (black box) | ❌ | ❌ | ✅ (transparent) |
+| EU sovereign | ❌ (CLOUD Act) | ❌ | ✅ | ✅ |
+| Open source | ❌ | ☠️ Archived | ✅ | ✅ |
+| Transparent tier reasoning | ❌ | ❌ | ❌ | ✅ |
+| Self-hosted | ❌ | ✅ | ✅ | ✅ |
+
+MinIO was archived in February 2026. RustFS is alpha. Garage targets geo-distribution only. **The space for a production-ready, intelligent, EU-sovereign S3 server is open.**
+
+---
+
+## Architecture
+
+Stratum is a Cargo workspace split into focused crates:
+
+```
+stratum/
+├── src/
+│   ├── stratum/            → binary — wires everything together
+│   ├── stratum-api-s3/     → S3 API layer (routes, handlers, auth)
+│   ├── stratum-storage/    → volume management, tier logic, shard I/O
+│   ├── stratum-metadata/   → bucket/key → volume mapping (sled)
+│   ├── stratum-tiering/    → tier decision engine
+│   ├── stratum-auth/       → AWS Signature V4 validation
+│   └── stratum-core/       → shared types and config
+```
+
+### Storage Model
+
+Objects are not stored directly by key. Keys point to **volumes**. Volumes hold the actual data and can live on any tier:
+
+```
+bucket/key  →  volume_id  →  Volume {
+                                 tier: Hot | Warm | Cold
+                                 location: Local(path) | Remote(url)
+                                 size, checksum
+                                 last_accessed, access_count  ← tiering signals
+                             }
+```
+
+When tiering promotes or demotes an object, only the volume location changes. The key never moves. Clients never know.
+
+### Storage Tiers
+
+```
+Hot  → NVMe/SSD   — frequently accessed objects, lowest latency
+Warm → HDD        — infrequently accessed, medium cost
+Cold → Remote S3  — rarely accessed, cheapest (B2, R2, AWS, Garage...)
+```
+
+### Erasure Coding
+
+Stratum uses Reed-Solomon erasure coding (4 data + 2 parity shards) instead of replication. This gives:
+
+```
+3x replication:    3.0x storage overhead, lose 1 node
+4+2 erasure:       1.5x storage overhead, lose any 2 nodes
+```
+
+Each object is split into shards. Shards are distributed across nodes/disks. Loss of any 2 shards is fully recoverable.
+
+---
+
+## S3 API Coverage
+
+### Implemented (routing layer)
+All routes are defined and return `501 Not Implemented` until handlers are built.
+
+| Operation | Method | Status |
+|---|---|---|
+| ListBuckets | GET / | 🔲 Stub |
+| CreateBucket | PUT /{bucket} | 🔲 Stub |
+| DeleteBucket | DELETE /{bucket} | 🔲 Stub |
+| HeadBucket | HEAD /{bucket} | 🔲 Stub |
+| ListObjectsV2 | GET /{bucket} | 🔲 Stub |
+| GetObject | GET /{bucket}/{*key} | 🔲 Stub |
+| PutObject | PUT /{bucket}/{*key} | 🔲 Stub |
+| DeleteObject | DELETE /{bucket}/{*key} | 🔲 Stub |
+| HeadObject | HEAD /{bucket}/{*key} | 🔲 Stub |
+| CreateMultipartUpload | POST /{bucket}/{*key}?uploads | 🔲 Stub |
+| UploadPart | PUT /{bucket}/{*key}?partNumber&uploadId | 🔲 Stub |
+| CompleteMultipartUpload | POST /{bucket}/{*key}?uploadId | 🔲 Stub |
+| AbortMultipartUpload | DELETE /{bucket}/{*key}?uploadId | 🔲 Stub |
+
+### Endpoint Parser
+All S3 endpoints are parsed from raw HTTP requests into typed `Endpoint` enum variants before reaching handlers. Query parameters disambiguate operations sharing the same route (e.g. `UploadPart` vs `PutObject`).
+
+### Error Handling
+S3-compatible error types defined:
+- `BucketNotFound` → 404
+- `ObjectNotFound` → 404
+- `BucketAlreadyExists` → 409
+- `InvalidArgument` → 400
+- `InvalidBucketName` → 400
+- `AuthorizationFailed` → 403
+- `MissingAuthHeader` → 401
+- `InternalError` → 500
+- `NotImplemented` → 501
+
+---
+
+## Design Principles
+
+- **KISS** — no macros where plain match arms work
+- **Bottom-up** — storage layer before API layer
+- **TDD** — tests written before implementation
+- **One concern per file** — enum definitions separate from parsing logic
+- **No lifetime annotations** — owned types throughout for maintainability
+- **`cargo fmt` always** — enforced formatting
+
+---
+
+## Testing
+
+```bash
+# run all tests
+cargo test
+
+# run specific crate
+cargo test -p stratum-api-s3
+
+# coverage report
+cargo tarpaulin -p stratum-api-s3 --out Html
+```
+
+### Test Layers
+
+```
+Unit tests        → endpoint parser, individual functions
+Integration tests → axum routes, full HTTP request/response
+E2E tests         → awscli + rclone against running server (planned)
+```
+
+---
+
+## Development Setup
+
+```bash
+git clone https://github.com/gsh-digital/stratum
+cd stratum
+cargo build
+cargo test
+```
+
+### Requirements
+- Rust 1.75+
+- cargo
+
+### Tested On
+- Linux x86_64
+- Linux aarch64 (Raspberry Pi 4) ← primary dev/test bench
+
+---
+
+## Roadmap
+
+### Phase 1 — Core S3 Server (current)
+> Goal: pass MinIO s3-tests suite at >95%, work with awscli and rclone out of the box
+
+### Phase 2 — Geo Distribution
+> Goal: multi-node replication across geographic regions with Raft consensus
+
+### Phase 3 — Intelligent Tiering
+> Goal: autonomous object movement between hot/warm/cold based on access patterns
+
+### Phase 4 — Managed Service
+> Goal: GSH Digital Services hosted offering with Grafana monitoring
+
+---
+
+## License
+
+Apache 2.0 — see LICENSE
+
+---
+
+## By
+
+**GSH Digital Services**
+Author: [Soliman, Ramez](mailto:r.soliman@gsh-services.com)
+Building EU-sovereign infrastructure that doesn't cost like AWS and doesn't require a PhD to operate.

src/stratum-api-s3/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "stratum-api-s3"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+axum.workspace = true
+hyper.workspace = true
+tower.workspace = true
+tokio.workspace = true

src/stratum-api-s3/src/endpoint/definitions.rs

@@ -0,0 +1,53 @@
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum Endpoint {
+    // Service level
+    ListBuckets,
+
+    // Bucket level
+    CreateBucket,
+    DeleteBucket,
+    HeadBucket,
+    ListObjectsV2 {
+        delimiter: Option<String>,
+        prefix: Option<String>,
+        max_keys: Option<usize>,
+        continuation_token: Option<String>,
+    },
+
+    // Object level
+    GetObject {
+        key: String,
+        version_id: Option<String>,
+        part_number: Option<u64>,
+    },
+    PutObject {
+        key: String,
+    },
+    DeleteObject {
+        key: String,
+        version_id: Option<String>,
+    },
+    HeadObject {
+        key: String,
+        version_id: Option<String>,
+        part_number: Option<u64>,
+    },
+
+    // Multipart
+    CreateMultipartUpload {
+        key: String,
+    },
+    UploadPart {
+        key: String,
+        part_number: u64,
+        upload_id: String,
+    },
+    CompleteMultipartUpload {
+        key: String,
+        upload_id: String,
+    },
+    AbortMultipartUpload {
+        key: String,
+        upload_id: String,
+    },
+}

src/stratum-api-s3/src/endpoint/mod.rs

@@ -0,0 +1,4 @@
+mod definitions;
+mod parser;
+
+pub use definitions::Endpoint;

src/stratum-api-s3/src/endpoint/parser.rs

@@ -0,0 +1,301 @@
+use super::definitions::Endpoint;
+use crate::errors::ApiError;
+use hyper::Method;
+use std::collections::HashMap;
+
+pub fn parse_endpoint(
+    method: &Method,
+    path: &str,
+    query: &HashMap<String, String>,
+) -> Result<Endpoint, ApiError> {
+    let segments: Vec<&str> = path.trim_start_matches('/').splitn(2, '/').collect();
+
+    let bucket = segments.get(0).copied().unwrap_or("");
+    let key = segments.get(1).copied().unwrap_or("");
+
+    match (method, bucket, key) {
+        // Service level
+        (&Method::GET, "", "") => Ok(Endpoint::ListBuckets),
+
+        // Bucket level
+        (&Method::PUT, b, "") if !b.is_empty() => Ok(Endpoint::CreateBucket),
+        (&Method::DELETE, b, "") if !b.is_empty() => Ok(Endpoint::DeleteBucket),
+        (&Method::HEAD, b, "") if !b.is_empty() => Ok(Endpoint::HeadBucket),
+        (&Method::GET, b, "") if !b.is_empty() => Ok(Endpoint::ListObjectsV2 {
+            delimiter: query.get("delimiter").cloned(),
+            prefix: query.get("prefix").cloned(),
+            max_keys: query.get("max-keys").and_then(|v| v.parse().ok()),
+            continuation_token: query.get("continuation-token").cloned(),
+        }),
+
+        // Object level
+        (&Method::GET, _, k) if !k.is_empty() => Ok(Endpoint::GetObject {
+            key: k.to_string(),
+            version_id: query.get("versionId").cloned(),
+            part_number: query.get("partNumber").and_then(|v| v.parse().ok()),
+        }),
+        (&Method::PUT, _, k) if !k.is_empty() => {
+            // distinguish UploadPart from PutObject
+            if let Some(upload_id) = query.get("uploadId") {
+                Ok(Endpoint::UploadPart {
+                    key: k.to_string(),
+                    upload_id: upload_id.clone(),
+                    part_number: query
+                        .get("partNumber")
+                        .and_then(|v| v.parse().ok())
+                        .ok_or(ApiError::InvalidArgument("missing partNumber".into()))?,
+                })
+            } else {
+                Ok(Endpoint::PutObject { key: k.to_string() })
+            }
+        }
+        (&Method::DELETE, _, k) if !k.is_empty() => {
+            if let Some(upload_id) = query.get("uploadId") {
+                Ok(Endpoint::AbortMultipartUpload {
+                    key: k.to_string(),
+                    upload_id: upload_id.clone(),
+                })
+            } else {
+                Ok(Endpoint::DeleteObject {
+                    key: k.to_string(),
+                    version_id: query.get("versionId").cloned(),
+                })
+            }
+        }
+        (&Method::HEAD, _, k) if !k.is_empty() => Ok(Endpoint::HeadObject {
+            key: k.to_string(),
+            version_id: query.get("versionId").cloned(),
+            part_number: query.get("partNumber").and_then(|v| v.parse().ok()),
+        }),
+        (&Method::POST, _, k) if !k.is_empty() => {
+            if query.contains_key("uploads") {
+                Ok(Endpoint::CreateMultipartUpload { key: k.to_string() })
+            } else if let Some(upload_id) = query.get("uploadId") {
+                Ok(Endpoint::CompleteMultipartUpload {
+                    key: k.to_string(),
+                    upload_id: upload_id.clone(),
+                })
+            } else {
+                Err(ApiError::InvalidArgument("unknown POST operation".into()))
+            }
+        }
+
+        _ => Err(ApiError::InvalidArgument(format!(
+            "unknown endpoint: {} {}",
+            method, path
+        ))),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use hyper::Method;
+    use std::collections::HashMap;
+
+    fn empty_query() -> HashMap<String, String> {
+        HashMap::new()
+    }
+
+    fn query(pairs: &[(&str, &str)]) -> HashMap<String, String> {
+        pairs
+            .iter()
+            .map(|(k, v)| (k.to_string(), v.to_string()))
+            .collect()
+    }
+
+    // Service level
+    #[test]
+    fn test_list_buckets() {
+        let result = parse_endpoint(&Method::GET, "/", &empty_query());
+        assert_eq!(result.unwrap(), Endpoint::ListBuckets);
+    }
+
+    // Bucket level
+    #[test]
+    fn test_create_bucket() {
+        let result = parse_endpoint(&Method::PUT, "/my-bucket", &empty_query());
+        assert_eq!(result.unwrap(), Endpoint::CreateBucket);
+    }
+
+    #[test]
+    fn test_delete_bucket() {
+        let result = parse_endpoint(&Method::DELETE, "/my-bucket", &empty_query());
+        assert_eq!(result.unwrap(), Endpoint::DeleteBucket);
+    }
+
+    #[test]
+    fn test_head_bucket() {
+        let result = parse_endpoint(&Method::HEAD, "/my-bucket", &empty_query());
+        assert_eq!(result.unwrap(), Endpoint::HeadBucket);
+    }
+
+    #[test]
+    fn test_list_objects_v2_empty() {
+        let result = parse_endpoint(&Method::GET, "/my-bucket", &empty_query());
+        assert_eq!(
+            result.unwrap(),
+            Endpoint::ListObjectsV2 {
+                delimiter: None,
+                prefix: None,
+                max_keys: None,
+                continuation_token: None,
+            }
+        );
+    }
+
+    #[test]
+    fn test_list_objects_v2_with_prefix() {
+        let q = query(&[("prefix", "photos/"), ("max-keys", "100")]);
+        let result = parse_endpoint(&Method::GET, "/my-bucket", &q);
+        assert_eq!(
+            result.unwrap(),
+            Endpoint::ListObjectsV2 {
+                delimiter: None,
+                prefix: Some("photos/".to_string()),
+                max_keys: Some(100),
+                continuation_token: None,
+            }
+        );
+    }
+
+    // Object level
+    #[test]
+    fn test_get_object() {
+        let result = parse_endpoint(&Method::GET, "/my-bucket/photo.jpg", &empty_query());
+        assert_eq!(
+            result.unwrap(),
+            Endpoint::GetObject {
+                key: "photo.jpg".to_string(),
+                version_id: None,
+                part_number: None,
+            }
+        );
+    }
+
+    #[test]
+    fn test_get_object_nested_key() {
+        let result = parse_endpoint(
+            &Method::GET,
+            "/my-bucket/photos/2024/beach.jpg",
+            &empty_query(),
+        );
+        assert_eq!(
+            result.unwrap(),
+            Endpoint::GetObject {
+                key: "photos/2024/beach.jpg".to_string(), // full path preserved
+                version_id: None,
+                part_number: None,
+            }
+        );
+    }
+
+    #[test]
+    fn test_put_object() {
+        let result = parse_endpoint(&Method::PUT, "/my-bucket/photo.jpg", &empty_query());
+        assert_eq!(
+            result.unwrap(),
+            Endpoint::PutObject {
+                key: "photo.jpg".to_string(),
+            }
+        );
+    }
+
+    #[test]
+    fn test_delete_object() {
+        let result = parse_endpoint(&Method::DELETE, "/my-bucket/photo.jpg", &empty_query());
+        assert_eq!(
+            result.unwrap(),
+            Endpoint::DeleteObject {
+                key: "photo.jpg".to_string(),
+                version_id: None,
+            }
+        );
+    }
+
+    #[test]
+    fn test_delete_object_with_version() {
+        let q = query(&[("versionId", "abc123")]);
+        let result = parse_endpoint(&Method::DELETE, "/my-bucket/photo.jpg", &q);
+        assert_eq!(
+            result.unwrap(),
+            Endpoint::DeleteObject {
+                key: "photo.jpg".to_string(),
+                version_id: Some("abc123".to_string()),
+            }
+        );
+    }
+
+    #[test]
+    fn test_head_object() {
+        let result = parse_endpoint(&Method::HEAD, "/my-bucket/photo.jpg", &empty_query());
+        assert_eq!(
+            result.unwrap(),
+            Endpoint::HeadObject {
+                key: "photo.jpg".to_string(),
+                version_id: None,
+                part_number: None,
+            }
+        );
+    }
+
+    // Multipart
+    #[test]
+    fn test_create_multipart_upload() {
+        let q = query(&[("uploads", "")]);
+        let result = parse_endpoint(&Method::POST, "/my-bucket/video.mp4", &q);
+        assert_eq!(
+            result.unwrap(),
+            Endpoint::CreateMultipartUpload {
+                key: "video.mp4".to_string(),
+            }
+        );
+    }
+
+    #[test]
+    fn test_upload_part() {
+        let q = query(&[("partNumber", "1"), ("uploadId", "abc123")]);
+        let result = parse_endpoint(&Method::PUT, "/my-bucket/video.mp4", &q);
+        assert_eq!(
+            result.unwrap(),
+            Endpoint::UploadPart {
+                key: "video.mp4".to_string(),
+                part_number: 1,
+                upload_id: "abc123".to_string(),
+            }
+        );
+    }
+
+    #[test]
+    fn test_complete_multipart_upload() {
+        let q = query(&[("uploadId", "abc123")]);
+        let result = parse_endpoint(&Method::POST, "/my-bucket/video.mp4", &q);
+        assert_eq!(
+            result.unwrap(),
+            Endpoint::CompleteMultipartUpload {
+                key: "video.mp4".to_string(),
+                upload_id: "abc123".to_string(),
+            }
+        );
+    }
+
+    #[test]
+    fn test_abort_multipart_upload() {
+        let q = query(&[("uploadId", "abc123")]);
+        let result = parse_endpoint(&Method::DELETE, "/my-bucket/video.mp4", &q);
+        assert_eq!(
+            result.unwrap(),
+            Endpoint::AbortMultipartUpload {
+                key: "video.mp4".to_string(),
+                upload_id: "abc123".to_string(),
+            }
+        );
+    }
+
+    // Error cases
+    #[test]
+    fn test_unknown_endpoint_returns_error() {
+        let result = parse_endpoint(&Method::PATCH, "/my-bucket/photo.jpg", &empty_query());
+        assert!(result.is_err());
+    }
+}

src/stratum-api-s3/src/errors/error.rs

@@ -0,0 +1,67 @@
+use axum::{
+    http::StatusCode,
+    response::{IntoResponse, Response},
+};
+
+#[derive(Debug, Clone, PartialEq)]
+pub enum ApiError {
+    // bucket errors
+    BucketNotFound,
+    BucketAlreadyExists,
+
+    // object errors
+    ObjectNotFound,
+
+    // request errors
+    InvalidArgument(String),
+    InvalidBucketName,
+
+    // auth errors
+    AuthorizationFailed,
+    MissingAuthHeader,
+
+    // server errors
+    InternalError(String),
+
+    // not implemented yet
+    NotImplemented,
+}
+
+impl std::fmt::Display for ApiError {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        match self {
+            //TODO: Add Api Error messages
+            ApiError::AuthorizationFailed => write!(f, "AuthorizationFailed"),
+            ApiError::BucketAlreadyExists => write!(f, "BucketAlreadyExists"),
+            ApiError::BucketNotFound => write!(f, "BucketNotFound"),
+            ApiError::InternalError(message) => write!(f, "InternalError: {}", message),
+            ApiError::InvalidArgument(message) => write!(f, "InvalidArgument: {}", message),
+            ApiError::InvalidBucketName => write!(f, "InvalidBucketName"),
+            ApiError::MissingAuthHeader => write!(f, "MissingAuthHeader"),
+            ApiError::NotImplemented => write!(f, "NotImplemented"),
+            ApiError::ObjectNotFound => write!(f, "ObjectNotFound"),
+        }
+    }
+}
+
+impl ApiError {
+    fn status_code(&self) -> StatusCode {
+        match self {
+            ApiError::BucketNotFound => StatusCode::NOT_FOUND,
+            ApiError::ObjectNotFound => StatusCode::NOT_FOUND,
+            ApiError::BucketAlreadyExists => StatusCode::CONFLICT,
+            ApiError::InvalidArgument(_) => StatusCode::BAD_REQUEST,
+            ApiError::InvalidBucketName => StatusCode::BAD_REQUEST,
+            ApiError::AuthorizationFailed => StatusCode::FORBIDDEN,
+            ApiError::MissingAuthHeader => StatusCode::UNAUTHORIZED,
+            ApiError::InternalError(_) => StatusCode::INTERNAL_SERVER_ERROR,
+            ApiError::NotImplemented => StatusCode::NOT_IMPLEMENTED,
+        }
+    }
+}
+
+impl IntoResponse for ApiError {
+    fn into_response(self) -> Response {
+        (self.status_code(), self.to_string()).into_response()
+    }
+}

src/stratum-api-s3/src/errors/mod.rs

@@ -0,0 +1,3 @@
+mod error;
+
+pub use error::ApiError;

src/stratum-api-s3/src/handlers/bucket.rs

@@ -0,0 +1,79 @@
+use axum::http::StatusCode;
+use axum::response::IntoResponse;
+
+pub async fn list_buckets() -> impl IntoResponse {
+    StatusCode::NOT_IMPLEMENTED
+}
+
+pub async fn create_bucket() -> impl IntoResponse {
+    StatusCode::NOT_IMPLEMENTED
+}
+
+pub async fn delete_bucket() -> impl IntoResponse {
+    StatusCode::NOT_IMPLEMENTED
+}
+
+pub async fn head_bucket() -> impl IntoResponse {
+    StatusCode::NOT_IMPLEMENTED
+}
+
+#[cfg(test)]
+mod tests {
+    use axum::{
+        body::Body,
+        http::{Request, StatusCode},
+    };
+    use tower::ServiceExt; // for oneshot
+    use crate::router::s3_router;
+
+    #[tokio::test]
+    async fn test_list_buckets_returns_501() {
+        let app = s3_router();
+        let response = app
+            .oneshot(
+                Request::builder()
+                    .method("GET")
+                    .uri("/")
+                    .body(Body::empty())
+                    .unwrap()
+            )
+            .await
+            .unwrap();
+
+        assert_eq!(response.status(), StatusCode::NOT_IMPLEMENTED);
+    }
+
+    #[tokio::test]
+    async fn test_create_bucket_returns_501() {
+        let app = s3_router();
+        let response = app
+            .oneshot(
+                Request::builder()
+                    .method("PUT")
+                    .uri("/my-bucket")
+                    .body(Body::empty())
+                    .unwrap()
+            )
+            .await
+            .unwrap();
+
+        assert_eq!(response.status(), StatusCode::NOT_IMPLEMENTED);
+    }
+
+    #[tokio::test]
+    async fn test_get_object_returns_501() {
+        let app = s3_router();
+        let response = app
+            .oneshot(
+                Request::builder()
+                    .method("GET")
+                    .uri("/my-bucket/photo.jpg")
+                    .body(Body::empty())
+                    .unwrap()
+            )
+            .await
+            .unwrap();
+
+        assert_eq!(response.status(), StatusCode::NOT_IMPLEMENTED);
+    }
+}

src/stratum-api-s3/src/handlers/mod.rs

@@ -0,0 +1,3 @@
+pub mod bucket;
+pub mod multipart;
+pub mod object;

src/stratum-api-s3/src/handlers/multipart.rs

@@ -0,0 +1,96 @@
+use axum::http::StatusCode;
+use axum::response::IntoResponse;
+
+pub async fn create_multipart_upload() -> impl IntoResponse {
+    StatusCode::NOT_IMPLEMENTED
+}
+
+pub async fn upload_part() -> impl IntoResponse {
+    StatusCode::NOT_IMPLEMENTED
+}
+
+pub async fn complete_multipart_upload() -> impl IntoResponse {
+    StatusCode::NOT_IMPLEMENTED
+}
+
+pub async fn abort_multipart_upload() -> impl IntoResponse {
+    StatusCode::NOT_IMPLEMENTED
+}
+
+#[cfg(test)]
+mod tests {
+    use axum::{
+        body::Body,
+        http::{Request, StatusCode},
+    };
+    use tower::ServiceExt;
+    use crate::router::s3_router;
+
+    #[tokio::test]
+    async fn test_create_multipart_upload_returns_501() {
+        let app = s3_router();
+        let response = app
+            .oneshot(
+                Request::builder()
+                    .method("POST")
+                    .uri("/my-bucket/video.mp4?uploads")
+                    .body(Body::empty())
+                    .unwrap()
+            )
+            .await
+            .unwrap();
+
+        assert_eq!(response.status(), StatusCode::NOT_IMPLEMENTED);
+    }
+
+    #[tokio::test]
+    async fn test_upload_part_returns_501() {
+        let app = s3_router();
+        let response = app
+            .oneshot(
+                Request::builder()
+                    .method("PUT")
+                    .uri("/my-bucket/video.mp4?partNumber=1&uploadId=abc123")
+                    .body(Body::empty())
+                    .unwrap()
+            )
+            .await
+            .unwrap();
+
+        assert_eq!(response.status(), StatusCode::NOT_IMPLEMENTED);
+    }
+
+    #[tokio::test]
+    async fn test_complete_multipart_upload_returns_501() {
+        let app = s3_router();
+        let response = app
+            .oneshot(
+                Request::builder()
+                    .method("POST")
+                    .uri("/my-bucket/video.mp4?uploadId=abc123")
+                    .body(Body::empty())
+                    .unwrap()
+            )
+            .await
+            .unwrap();
+
+        assert_eq!(response.status(), StatusCode::NOT_IMPLEMENTED);
+    }
+
+    #[tokio::test]
+    async fn test_abort_multipart_upload_returns_501() {
+        let app = s3_router();
+        let response = app
+            .oneshot(
+                Request::builder()
+                    .method("DELETE")
+                    .uri("/my-bucket/video.mp4?uploadId=abc123")
+                    .body(Body::empty())
+                    .unwrap()
+            )
+            .await
+            .unwrap();
+
+        assert_eq!(response.status(), StatusCode::NOT_IMPLEMENTED);
+    }
+}

src/stratum-api-s3/src/handlers/object.rs

@@ -0,0 +1,136 @@
+use axum::http::StatusCode;
+use axum::response::IntoResponse;
+
+pub async fn get_object() -> impl IntoResponse {
+    StatusCode::NOT_IMPLEMENTED
+}
+
+pub async fn put_object() -> impl IntoResponse {
+    StatusCode::NOT_IMPLEMENTED
+}
+
+pub async fn delete_object() -> impl IntoResponse {
+    StatusCode::NOT_IMPLEMENTED
+}
+
+pub async fn head_object() -> impl IntoResponse {
+    StatusCode::NOT_IMPLEMENTED
+}
+
+pub async fn list_objects_v2() -> impl IntoResponse {
+    StatusCode::NOT_IMPLEMENTED
+}
+
+
+
+#[cfg(test)]
+mod tests {
+    use axum::{
+        body::Body,
+        http::{Request, StatusCode},
+    };
+    use tower::ServiceExt;
+    use crate::router::s3_router;
+
+    #[tokio::test]
+    async fn test_get_object_returns_501() {
+        let app = s3_router();
+        let response = app
+            .oneshot(
+                Request::builder()
+                    .method("GET")
+                    .uri("/my-bucket/photo.jpg")
+                    .body(Body::empty())
+                    .unwrap()
+            )
+            .await
+            .unwrap();
+
+        assert_eq!(response.status(), StatusCode::NOT_IMPLEMENTED);
+    }
+
+    #[tokio::test]
+    async fn test_put_object_returns_501() {
+        let app = s3_router();
+        let response = app
+            .oneshot(
+                Request::builder()
+                    .method("PUT")
+                    .uri("/my-bucket/photo.jpg")
+                    .body(Body::empty())
+                    .unwrap()
+            )
+            .await
+            .unwrap();
+
+        assert_eq!(response.status(), StatusCode::NOT_IMPLEMENTED);
+    }
+
+    #[tokio::test]
+    async fn test_delete_object_returns_501() {
+        let app = s3_router();
+        let response = app
+            .oneshot(
+                Request::builder()
+                    .method("DELETE")
+                    .uri("/my-bucket/photo.jpg")
+                    .body(Body::empty())
+                    .unwrap()
+            )
+            .await
+            .unwrap();
+
+        assert_eq!(response.status(), StatusCode::NOT_IMPLEMENTED);
+    }
+
+    #[tokio::test]
+    async fn test_head_object_returns_501() {
+        let app = s3_router();
+        let response = app
+            .oneshot(
+                Request::builder()
+                    .method("HEAD")
+                    .uri("/my-bucket/photo.jpg")
+                    .body(Body::empty())
+                    .unwrap()
+            )
+            .await
+            .unwrap();
+
+        assert_eq!(response.status(), StatusCode::NOT_IMPLEMENTED);
+    }
+
+    #[tokio::test]
+    async fn test_list_objects_v2_returns_501() {
+        let app = s3_router();
+        let response = app
+            .oneshot(
+                Request::builder()
+                    .method("GET")
+                    .uri("/my-bucket")
+                    .body(Body::empty())
+                    .unwrap()
+            )
+            .await
+            .unwrap();
+
+        assert_eq!(response.status(), StatusCode::NOT_IMPLEMENTED);
+    }
+
+    #[tokio::test]
+    async fn test_get_object_nested_key_returns_501() {
+        let app = s3_router();
+        let response = app
+            .oneshot(
+                Request::builder()
+                    .method("GET")
+                    .uri("/my-bucket/photos/2024/beach.jpg")
+                    .body(Body::empty())
+                    .unwrap()
+            )
+            .await
+            .unwrap();
+
+        assert_eq!(response.status(), StatusCode::NOT_IMPLEMENTED);
+    }
+}

src/stratum-api-s3/src/lib.rs

@@ -0,0 +1,6 @@
+pub mod endpoint;
+pub mod errors;
+pub mod handlers;
+pub mod router;
+
+pub use endpoint::Endpoint;

src/stratum-api-s3/src/router.rs

@@ -0,0 +1,22 @@
+use axum::{
+    Router,
+    routing::{delete, get, head, post, put},
+};
+use crate::handlers::{bucket, object, multipart};
+
+pub fn s3_router() -> Router {
+    Router::new()
+        // Service level
+        .route("/", get(bucket::list_buckets))
+        // Bucket level
+        .route("/{bucket}", put(bucket::create_bucket))
+        .route("/{bucket}", delete(bucket::delete_bucket))
+        .route("/{bucket}", head(bucket::head_bucket))
+        // Object level
+        .route("/{bucket}", get(object::list_objects_v2))
+        .route("/{bucket}/{*key}", get(object::get_object))
+        .route("/{bucket}/{*key}", head(object::head_object))
+        .route("/{bucket}/{*key}", delete(object::delete_object))
+        .route("/{bucket}/{*key}", post(multipart::create_multipart_upload))
+        .route("/{bucket}/{*key}", put(object::put_object))
+}

src/stratum-auth/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "stratum-auth"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

src/stratum-auth/src/lib.rs

@@ -0,0 +1,14 @@
+pub fn add(left: u64, right: u64) -> u64 {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}

src/stratum-core/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "stratum-core"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

src/stratum-core/src/lib.rs

@@ -0,0 +1,14 @@
+pub fn add(left: u64, right: u64) -> u64 {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}

src/stratum-metadata/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "stratum-metadata"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

src/stratum-metadata/src/lib.rs

@@ -0,0 +1,14 @@
+pub fn add(left: u64, right: u64) -> u64 {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}

src/stratum-storage/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "stratum-storage"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+reed-solomon-erasure.workspace = true
+uuid.workspace = true
+tokio.workspace = true
+anyhow.workspace = true

src/stratum-storage/src/definitions/config.rs

@@ -0,0 +1,9 @@
+use std::path::PathBuf;
+
+pub struct StorageConfig {
+    pub hot_path: PathBuf,
+    pub warm_path: PathBuf,
+    pub cold_endpoint: String,
+    pub data_shards: usize,    // default 4
+    pub parity_shards: usize,  // default 2
+}

src/stratum-storage/src/definitions/location.rs

@@ -0,0 +1,11 @@
+use std::path::PathBuf;
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum Location {
+    Local(Vec<PathBuf>),
+    Remote {
+        endpoint: String,
+        bucket: String,
+        keys: Vec<String>
+    }
+}

src/stratum-storage/src/definitions/mod.rs

@@ -0,0 +1,7 @@
+mod location;
+mod storage_tier;
+mod object_manifest;
+mod config;
+
+pub use object_manifest::ObjectManifest;
+pub use config::StorageConfig;

src/stratum-storage/src/definitions/object_manifest.rs

@@ -0,0 +1,13 @@
+use crate::definitions::{location::Location, storage_tier::StorageTier};
+
+#[derive(Debug, Clone)]
+pub struct ObjectManifest {
+    pub id: String,
+    pub tier: StorageTier,
+    pub location : Location,
+    pub size : u64,
+    pub checksum : String,
+    pub created_at : u64,
+    pub last_accessed: u64,
+    pub access_count: u64
+}

src/stratum-storage/src/definitions/storage_tier.rs

@@ -0,0 +1,6 @@
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
+pub enum StorageTier {
+    Hot = 1,
+    Warm = 2,
+    Cold = 3
+}

src/stratum-storage/src/lib.rs

@@ -0,0 +1,2 @@
+pub mod definitions;
+pub mod shard;

src/stratum-storage/src/shard.rs

@@ -0,0 +1,198 @@
+use reed_solomon_erasure::galois_8::ReedSolomon;
+use anyhow::{Ok, Result};
+
+use crate::shard;
+
+const DATA_SHARDS: usize = 4;
+const PARITY_SHARDS: usize = 2;
+const TOTAL_SHARDS: usize = DATA_SHARDS + PARITY_SHARDS;
+
+pub struct ShardEncoder {
+    rs: ReedSolomon,
+}
+
+impl ShardEncoder {
+    pub fn new() -> Result<Self> {
+        Ok(Self { 
+            rs: ReedSolomon::new(DATA_SHARDS, PARITY_SHARDS)?, 
+        })
+    }
+
+    // Split bytes into 6 shards (4 data + 2 parity)
+    pub fn encode(&self, data: &[u8]) -> Result<Vec<Vec<u8>>> {
+        // calculate chunk size, padding to equal length
+        let chunk_size = (data.len() + DATA_SHARDS - 1) / DATA_SHARDS;
+
+        // split data into 4 equal shards
+        let mut shards : Vec<Vec<u8>> = (0..DATA_SHARDS)
+        .map(|i| {
+            let start = i * chunk_size;
+            let end = (start + chunk_size).min(data.len());
+            let mut chunk = data[start..end].to_vec();
+            chunk.resize(chunk_size, 0); // pad last chunk if needed
+            chunk
+        }).collect();
+
+        // add empty parity shards
+        for _ in 0..PARITY_SHARDS {
+            shards.push(vec![0u8; chunk_size]);
+        }
+
+        self.rs.encode(&mut shards)?;
+        Ok(shards)
+    }
+
+    pub fn decode(
+        &self,
+        shards: Vec<Option<Vec<u8>>>,
+        original_size: usize
+    ) -> Result<Vec<u8>> {
+        let mut shards = shards;
+        self.rs.reconstruct(&mut shards)?;
+
+        // reconstruct missing shards
+        let mut result = Vec::with_capacity(original_size);
+
+        // reassemble data shards only (ignore parity)
+        for i in 0..DATA_SHARDS {
+            if let Some(shard) = &shards[i] {
+                result.extend_from_slice(shard);
+            }
+        }
+
+        // trim padding back to original size
+        result.truncate(original_size);
+        Ok(result)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn encoder() -> ShardEncoder {
+        ShardEncoder::new().unwrap()
+    }
+
+    #[test]
+    fn test_encode_produces_six_shards() {
+        let encoder = encoder();
+        let data = b"hello world this is test data!!";
+        let shards = encoder.encode(data).unwrap();
+        assert_eq!(shards.len(), TOTAL_SHARDS);
+    }
+
+    #[test]
+    fn test_encode_decode_roundtrip() {
+        let encoder = encoder();
+        let data = b"hello world this is test data!!";
+        let shards = encoder.encode(data).unwrap();
+
+        let wrapped: Vec<Option<Vec<u8>>> = shards
+            .into_iter()
+            .map(Some)
+            .collect();
+
+        let decoded = encoder.decode(wrapped, data.len()).unwrap();
+        assert_eq!(decoded, data);
+    }
+
+    #[test]
+    fn test_decode_with_one_missing_shard() {
+        let encoder = encoder();
+        let data = b"hello world this is test data!!";
+        let shards = encoder.encode(data).unwrap();
+
+        // lose shard 0
+        let mut wrapped: Vec<Option<Vec<u8>>> = shards
+            .into_iter()
+            .map(Some)
+            .collect();
+        wrapped[0] = None;
+
+        let decoded = encoder.decode(wrapped, data.len()).unwrap();
+        assert_eq!(decoded, data);
+    }
+
+    #[test]
+    fn test_decode_with_two_missing_shards() {
+        let encoder = encoder();
+        let data = b"hello world this is test data!!";
+        let shards = encoder.encode(data).unwrap();
+
+        // lose shard 0 and shard 2
+        let mut wrapped: Vec<Option<Vec<u8>>> = shards
+            .into_iter()
+            .map(Some)
+            .collect();
+        wrapped[0] = None;
+        wrapped[2] = None;
+
+        let decoded = encoder.decode(wrapped, data.len()).unwrap();
+        assert_eq!(decoded, data);
+    }
+
+    #[test]
+    fn test_decode_with_two_parity_shards_missing() {
+        let encoder = encoder();
+        let data = b"hello world this is test data!!";
+        let shards = encoder.encode(data).unwrap();
+
+        // lose both parity shards
+        let mut wrapped: Vec<Option<Vec<u8>>> = shards
+            .into_iter()
+            .map(Some)
+            .collect();
+        wrapped[4] = None;
+        wrapped[5] = None;
+
+        let decoded = encoder.decode(wrapped, data.len()).unwrap();
+        assert_eq!(decoded, data);
+    }
+
+    #[test]
+    fn test_shards_are_equal_size() {
+        let encoder = encoder();
+        let data = b"hello world this is test data!!";
+        let shards = encoder.encode(data).unwrap();
+
+        let first_size = shards[0].len();
+        for shard in &shards {
+            assert_eq!(shard.len(), first_size);
+        }
+    }
+
+    #[test]
+    fn test_large_object() {
+        let encoder = encoder();
+        let data = vec![42u8; 1024 * 1024]; // 1MB
+        let shards = encoder.encode(&data).unwrap();
+        
+        let wrapped: Vec<Option<Vec<u8>>> = shards
+            .into_iter()
+            .map(Some)
+            .collect();
+
+        let decoded = encoder.decode(wrapped, data.len()).unwrap();
+        assert_eq!(decoded, data);
+    }
+
+    #[test]
+    fn test_three_missing_shards_fails() {
+        let encoder = encoder();
+        let data = b"hello world this is test data!!";
+        let shards = encoder.encode(data).unwrap();
+
+        // lose 3 shards - beyond recovery
+        let mut wrapped: Vec<Option<Vec<u8>>> = shards
+            .into_iter()
+            .map(Some)
+            .collect();
+        wrapped[0] = None;
+        wrapped[1] = None;
+        wrapped[2] = None;
+
+        let result = encoder.decode(wrapped, data.len());
+        assert!(result.is_err());
+    }
+}

src/stratum-tiering/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "stratum-tiering"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

src/stratum-tiering/src/lib.rs

@@ -0,0 +1,14 @@
+pub fn add(left: u64, right: u64) -> u64 {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}

src/stratum/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "stratum"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

src/stratum/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

todo.md

@@ -0,0 +1,123 @@
+# Stratum — TODO
+
+## Immediate Next Session
+
+### 1. `stratum-storage` — Volume Layer
+- [ ] `config.rs` — StorageConfig with hot/warm/cold paths
+- [x] `tier.rs` — StorageTier enum (Hot, Warm, Cold)
+- [x] `location.rs` — Location + ShardLocation enums (Local/Remote/Mixed)
+- [x] `manifest.rs` — Volume struct with access tracking fields
+- [ ] `store.rs` — VolumeStore (in-memory HashMap for now)
+- [ ] `shard.rs` — async read/write/delete shard files via tokio::fs
+- [ ] Tests for all of the above
+
+### 2. `stratum-metadata` — Bucket + Key Mapping
+- [ ] Sled-backed metadata store
+- [ ] Bucket operations (create, delete, exists, list)
+- [ ] Key → Volume ID mapping (put, get, delete, list)
+- [ ] Tests for all of the above
+
+### 3. Wire Storage Into API Handlers (bottom-up)
+- [ ] `CreateBucket` → 200 (create metadata entry)
+- [ ] `ListBuckets` → 200 + XML response
+- [ ] `PutObject` → 200 (write shard, create volume, store mapping)
+- [ ] `GetObject` → 200 + stream bytes (read shard via volume location)
+- [ ] `DeleteObject` → 204 (delete shard + metadata)
+- [ ] `HeadObject` → 200 + metadata headers only
+- [ ] `ListObjectsV2` → 200 + XML response
+- [ ] Multipart (last, most complex)
+
+### 4. XML Responses
+- [ ] `xml/responses.rs` — ListBuckets XML
+- [ ] `xml/responses.rs` — ListObjectsV2 XML
+- [ ] `xml/responses.rs` — Error XML (replace current plain text)
+- [ ] `xml/responses.rs` — InitiateMultipartUploadResult XML
+- [ ] `xml/responses.rs` — CompleteMultipartUploadResult XML
+
+---
+
+## Backlog (Implement After Core Works)
+
+### S3 Compatibility
+- [ ] AWS Signature V4 validation (`stratum-auth`)
+- [ ] ETag generation (MD5 for single part, MD5-of-MD5s for multipart)
+- [ ] Content-MD5 header validation on PUT
+- [ ] Bucket naming validation (3-63 chars, lowercase, no underscores)
+- [ ] `GetBucketLocation` endpoint
+- [ ] `CopyObject` endpoint
+- [ ] Virtual-hosted style URLs (bucket.host/key)
+- [ ] Range request support (critical for video streaming)
+- [ ] Conditional requests (If-None-Match, If-Modified-Since)
+
+### Storage
+- [ ] Erasure coding integration (reed-solomon-erasure)
+- [ ] Shard distribution across multiple disks/directories
+- [ ] Checksum verification on read
+- [ ] Atomic writes (write to temp, rename to final)
+- [ ] Multipart upload temporary shard storage
+- [ ] Multipart upload cleanup on abort
+
+### Testing
+- [ ] Run MinIO s3-tests compliance suite against server
+- [ ] Test with awscli (`--no-sign-request` flag)
+- [ ] Test with rclone
+- [ ] Test with aws-sdk-rust
+- [ ] Coverage report via cargo-tarpaulin
+- [ ] Helper function refactor for query param extraction (backlogged from parser)
+
+### Binary (`stratum`)
+- [ ] `main.rs` — start axum server
+- [ ] Config file loading (toml)
+- [ ] CLI args (port, config path, data dir)
+- [ ] Graceful shutdown
+- [ ] Structured logging via tracing
+
+---
+
+## Phase 2 Backlog — Geo Distribution
+
+- [ ] Node discovery and membership
+- [ ] Raft consensus via openraft (metadata only)
+- [ ] Consistent hashing for object placement
+- [ ] Shard distribution across geographic nodes
+- [ ] Node failure detection and recovery
+- [ ] Replication lag monitoring
+
+---
+
+## Phase 3 Backlog — Intelligent Tiering
+
+- [ ] Access frequency tracking (exponential moving average)
+- [ ] Spike detection (sudden 10x access increase → promote immediately)
+- [ ] Time-of-day pattern recognition
+- [ ] Decay function (not accessed in 48h → demote)
+- [ ] MIME type classification (pre-trained ONNX model)
+- [ ] Range request pattern detection (video streaming awareness)
+- [ ] Tier promotion/demotion engine
+- [ ] Warmup period (observe 7 days before making tier decisions)
+- [ ] Developer priority hints via object metadata
+- [ ] Transparency API (why is this object in this tier?)
+- [ ] Prometheus metrics endpoint
+
+---
+
+## Phase 4 Backlog — Managed Service
+
+- [ ] Multi-tenant isolation
+- [ ] Grafana dashboard
+- [ ] Alerting (disk usage, node health, replication lag)
+- [ ] Billing metrics
+- [ ] BSI C5 certification process
+- [ ] ISO 27001 certification process
+- [ ] SLA definition and monitoring
+- [ ] Enterprise support tier
+
+---
+
+## Known Issues / Technical Debt
+
+- [ ] `VolumeStore` is currently in-memory only — needs sled persistence
+- [ ] Error responses return plain text — should return S3 XML format
+- [ ] No auth middleware yet — all requests accepted unsigned
+- [ ] `StorageConfig` cold tier credentials need secure storage solution
+- [ ] Query param helper functions (opt_string, opt_parse) backlogged from parser refactor