a lot of stuff

backend/src/bin/webdav.rs

@@ -0,0 +1,48 @@
+use std::net::SocketAddr;
+use std::sync::Arc;
+
+use tokio::net::TcpListener;
+use tower::make::Shared;
+use tracing_subscriber::EnvFilter;
+
+use backend::auth::jwt::JwtService;
+use backend::config::AppConfig;
+use backend::db;
+use backend::routes::webdav;
+use backend::s3::build_client;
+use backend::state::AppState;
+use backend::storage::S3Storage;
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    dotenv::dotenv().ok();
+    init_tracing();
+
+    let config = AppConfig::from_env()?;
+    let pool = db::init_pool(&config.database_url)?;
+    let s3_client = build_client(&config).await?;
+    let storage = Arc::new(S3Storage::new(s3_client, config.s3_bucket.clone()));
+    let jwt = JwtService::from_config(&config)?;
+
+    let state = AppState::new(pool, config, storage, jwt);
+    let listen_addr: SocketAddr = {
+        let config = state.config.clone();
+        format!("{}:{}", config.webdav_host, config.webdav_port).parse()?
+    };
+    let router = webdav::create_router().with_state(state);
+
+    let listener = TcpListener::bind(listen_addr).await?;
+    tracing::info!("listening for WebDAV on {}", listen_addr);
+
+    axum::serve(listener, Shared::new(router)).await?;
+    Ok(())
+}
+
+fn init_tracing() {
+    let filter = EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info"));
+    tracing_subscriber::fmt()
+        .with_env_filter(filter)
+        .with_target(false)
+        .compact()
+        .init();
+}

backend/src/config.rs

@@ -7,6 +7,8 @@ pub struct AppConfig {
     pub database_url: String,
     pub server_host: String,
     pub server_port: u16,
+    pub webdav_host: String,
+    pub webdav_port: u16,
     pub jwt_secret: String,
     pub jwt_issuer: String,
     pub jwt_audience: String,
@@ -34,6 +36,11 @@ impl AppConfig {
             .unwrap_or_else(|_| "3000".to_string())
             .parse()
             .context("SERVER_PORT must be a valid u16")?;
+        let webdav_host = env::var("WEBDAV_HOST").unwrap_or_else(|_| server_host.clone());
+        let webdav_port = env::var("WEBDAV_PORT")
+            .unwrap_or_else(|_| "3001".to_string())
+            .parse()
+            .context("WEBDAV_PORT must be a valid u16")?;
         let jwt_secret = env::var("JWT_SECRET").context("JWT_SECRET must be set")?;
         let jwt_issuer = env::var("JWT_ISSUER").unwrap_or_else(|_| "papercrate".to_string());
         let jwt_audience =
@@ -69,6 +76,8 @@ impl AppConfig {
             database_url,
             server_host,
             server_port,
+            webdav_host,
+            webdav_port,
             jwt_secret,
             jwt_issuer,
             jwt_audience,

backend/src/routes/documents.rs

@@ -205,6 +205,12 @@ pub struct BulkTagResponse {
     pub removed: usize,
 }
 
+#[derive(Serialize)]
+pub struct BulkCorrespondentResponse {
+    pub assigned: usize,
+    pub removed: usize,
+}
+
 #[derive(Deserialize)]
 pub struct CorrespondentAssignmentInput {
     pub correspondent_id: Uuid,
@@ -218,6 +224,69 @@ pub struct AssignCorrespondentsRequest {
     pub replace: bool,
 }
 
+#[derive(Deserialize, Copy, Clone, PartialEq, Eq)]
+#[serde(rename_all = "lowercase")]
+pub enum BulkCorrespondentAction {
+    Add,
+    Remove,
+}
+
+fn default_bulk_correspondent_action() -> BulkCorrespondentAction {
+    BulkCorrespondentAction::Add
+}
+
+#[derive(Deserialize)]
+pub struct BulkCorrespondentsRequest {
+    pub document_ids: Vec<Uuid>,
+    pub assignments: Vec<CorrespondentAssignmentInput>,
+    #[serde(default = "default_bulk_correspondent_action")]
+    pub action: BulkCorrespondentAction,
+}
+
+fn normalize_correspondent_assignments(
+    assignments: &[CorrespondentAssignmentInput],
+) -> AppResult<(Vec<(Uuid, String)>, Vec<Uuid>, Vec<String>)> {
+    let mut unique_pairs: HashSet<(Uuid, String)> = HashSet::new();
+    let mut normalized_pairs: Vec<(Uuid, String)> = Vec::new();
+    let mut role_set: HashSet<String> = HashSet::new();
+    let mut correspondent_ids: HashSet<Uuid> = HashSet::new();
+
+    for assignment in assignments {
+        let role = normalize_role(&assignment.role);
+        if role.is_empty() {
+            return Err(AppError::bad_request("role must not be empty"));
+        }
+        if !is_valid_correspondent_role(&role) {
+            return Err(AppError::bad_request(format!(
+                "invalid correspondent role '{role}'. Allowed roles: {}",
+                CORRESPONDENT_ROLES.join(", ")
+            )));
+        }
+
+        if !unique_pairs.insert((assignment.correspondent_id, role.clone())) {
+            continue;
+        }
+
+        normalized_pairs.push((assignment.correspondent_id, role.clone()));
+        role_set.insert(role);
+        correspondent_ids.insert(assignment.correspondent_id);
+    }
+
+    if normalized_pairs.is_empty() {
+        return Err(AppError::bad_request(
+            "assignments must contain at least one unique correspondent/role pair",
+        ));
+    }
+
+    let mut correspondents_vec: Vec<Uuid> = correspondent_ids.into_iter().collect();
+    correspondents_vec.sort();
+
+    let mut roles_vec: Vec<String> = role_set.into_iter().collect();
+    roles_vec.sort();
+
+    Ok((normalized_pairs, correspondents_vec, roles_vec))
+}
+
 #[derive(Deserialize)]
 pub struct CorrespondentRoleQuery {
     pub role: String,
@@ -850,40 +919,8 @@ pub async fn assign_correspondents(
         return Err(AppError::bad_request("assignments must not be empty"));
     }
 
-    let mut unique_pairs: HashSet<(Uuid, String)> = HashSet::new();
-    let mut normalized_pairs: Vec<(Uuid, String)> = Vec::new();
-    let mut role_set: HashSet<String> = HashSet::new();
-    let mut correspondent_ids: HashSet<Uuid> = HashSet::new();
-
-    for assignment in &payload.assignments {
-        let role = normalize_role(&assignment.role);
-        if role.is_empty() {
-            return Err(AppError::bad_request("role must not be empty"));
-        }
-        if !is_valid_correspondent_role(&role) {
-            return Err(AppError::bad_request(format!(
-                "invalid correspondent role '{role}'. Allowed roles: {}",
-                CORRESPONDENT_ROLES.join(", ")
-            )));
-        }
-
-        if !unique_pairs.insert((assignment.correspondent_id, role.clone())) {
-            continue;
-        }
-
-        normalized_pairs.push((assignment.correspondent_id, role.clone()));
-        role_set.insert(role);
-        correspondent_ids.insert(assignment.correspondent_id);
-    }
-
-    if normalized_pairs.is_empty() {
-        return Err(AppError::bad_request(
-            "assignments must contain at least one unique correspondent/role pair",
-        ));
-    }
-
-    let correspondents_vec: Vec<Uuid> = correspondent_ids.into_iter().collect();
-    let roles_vec: Vec<String> = role_set.into_iter().collect();
+    let (normalized_pairs, correspondents_vec, roles_vec) =
+        normalize_correspondent_assignments(&payload.assignments)?;
     let replace = payload.replace;
     let user_id = user.user_id;
 
@@ -950,6 +987,137 @@ pub async fn assign_correspondents(
     Ok(StatusCode::NO_CONTENT)
 }
 
+pub async fn bulk_assign_correspondents(
+    State(state): State<AppState>,
+    user: AuthenticatedUser,
+    Json(payload): Json<BulkCorrespondentsRequest>,
+) -> AppResult<(StatusCode, Json<BulkCorrespondentResponse>)> {
+    if payload.document_ids.is_empty() {
+        return Err(AppError::bad_request("document_ids must not be empty"));
+    }
+    if payload.assignments.is_empty() {
+        return Err(AppError::bad_request("assignments must not be empty"));
+    }
+
+    let mut document_ids = payload.document_ids;
+    document_ids.sort();
+    document_ids.dedup();
+
+    let (normalized_pairs, correspondents_vec, roles_vec) =
+        normalize_correspondent_assignments(&payload.assignments)?;
+    let action = payload.action;
+    let user_id = user.user_id;
+
+    let mut conn = state.db()?;
+    let (assigned, removed) = conn.transaction::<(usize, usize), AppError, _>(|conn| {
+        let docs: Vec<(Uuid, Option<NaiveDateTime>)> = documents::table
+            .filter(documents::id.eq_any(&document_ids))
+            .select((documents::id, documents::deleted_at))
+            .load(conn)?;
+
+        if docs.len() != document_ids.len() {
+            return Err(AppError::bad_request(
+                "one or more documents do not exist or are inaccessible",
+            ));
+        }
+
+        if docs.iter().any(|(_, deleted)| deleted.is_some()) {
+            return Err(AppError::bad_request(
+                "cannot assign correspondents to deleted documents",
+            ));
+        }
+
+        if !correspondents_vec.is_empty() {
+            let existing: Vec<Correspondent> = correspondents::table
+                .filter(correspondents::id.eq_any(&correspondents_vec))
+                .load(conn)?;
+            if existing.len() != correspondents_vec.len() {
+                return Err(AppError::bad_request(
+                    "one or more correspondents do not exist",
+                ));
+            }
+        }
+
+        match action {
+            BulkCorrespondentAction::Add => {
+                let mut removed = 0;
+                if !roles_vec.is_empty() {
+                    removed = diesel::delete(
+                        document_correspondents::table
+                            .filter(document_correspondents::document_id.eq_any(&document_ids))
+                            .filter(document_correspondents::role.eq_any(&roles_vec)),
+                    )
+                    .execute(conn)?;
+                }
+
+                let mut new_rows = Vec::with_capacity(document_ids.len() * normalized_pairs.len());
+                for doc_id in &document_ids {
+                    for (correspondent_id, role) in &normalized_pairs {
+                        new_rows.push(NewDocumentCorrespondent {
+                            document_id: *doc_id,
+                            correspondent_id: *correspondent_id,
+                            role: role.clone(),
+                            assigned_by: Some(user_id),
+                        });
+                    }
+                }
+
+                let assigned = if new_rows.is_empty() {
+                    0
+                } else {
+                    diesel::insert_into(document_correspondents::table)
+                        .values(&new_rows)
+                        .on_conflict_do_nothing()
+                        .execute(conn)?
+                };
+
+                if assigned > 0 || removed > 0 {
+                    diesel::update(documents::table.filter(documents::id.eq_any(&document_ids)))
+                        .set(documents::updated_at.eq(Utc::now().naive_utc()))
+                        .execute(conn)?;
+                }
+
+                Ok((assigned, removed))
+            }
+            BulkCorrespondentAction::Remove => {
+                let mut removed = 0;
+                if !normalized_pairs.is_empty() {
+                    let mut grouped: HashMap<String, Vec<Uuid>> = HashMap::new();
+                    for (correspondent_id, role) in &normalized_pairs {
+                        grouped
+                            .entry(role.clone())
+                            .or_default()
+                            .push(*correspondent_id);
+                    }
+
+                    for (role, ids) in grouped {
+                        removed += diesel::delete(
+                            document_correspondents::table
+                                .filter(document_correspondents::document_id.eq_any(&document_ids))
+                                .filter(document_correspondents::role.eq(role.as_str()))
+                                .filter(document_correspondents::correspondent_id.eq_any(&ids)),
+                        )
+                        .execute(conn)?;
+                    }
+                }
+
+                if removed > 0 {
+                    diesel::update(documents::table.filter(documents::id.eq_any(&document_ids)))
+                        .set(documents::updated_at.eq(Utc::now().naive_utc()))
+                        .execute(conn)?;
+                }
+
+                Ok((0, removed))
+            }
+        }
+    })?;
+
+    Ok((
+        StatusCode::OK,
+        Json(BulkCorrespondentResponse { assigned, removed }),
+    ))
+}
+
 pub async fn remove_correspondent(
     State(state): State<AppState>,
     Path((document_id, correspondent_id)): Path<(Uuid, Uuid)>,

backend/src/routes/folders.rs

@@ -11,7 +11,7 @@ use std::collections::{HashMap, HashSet};
 use uuid::Uuid;
 
 use crate::models::{Document, Folder, NewFolder};
-use crate::schema::{document_tags, documents, folders};
+use crate::schema::{document_correspondents, document_tags, documents, folders};
 use crate::state::AppState;
 use crate::{
     auth::AuthenticatedUser,
@@ -60,6 +60,7 @@ pub struct FolderContentsResponse {
 pub struct DocumentSearchQuery {
     pub query: Option<String>,
     pub tags: Option<String>,
+    pub correspondents: Option<String>,
 }
 
 #[derive(Serialize)]
@@ -353,6 +354,55 @@ pub async fn search_documents(
         }
     }
 
+    if let Some(correspondents_param) = params
+        .correspondents
+        .as_ref()
+        .map(|s| s.trim())
+        .filter(|s| !s.is_empty())
+    {
+        let correspondent_ids: Result<Vec<Uuid>, _> = correspondents_param
+            .split(',')
+            .map(|s| Uuid::parse_str(s.trim()))
+            .collect();
+
+        if let Ok(ids) = correspondent_ids {
+            if !ids.is_empty() {
+                let mut doc_id_set: Option<HashSet<Uuid>> = None;
+                for correspondent_id in &ids {
+                    let docs_for_correspondent: Vec<Uuid> = document_correspondents::table
+                        .filter(document_correspondents::correspondent_id.eq(*correspondent_id))
+                        .select(document_correspondents::document_id)
+                        .load(&mut conn)?;
+
+                    let docs_set: HashSet<Uuid> = docs_for_correspondent.into_iter().collect();
+                    doc_id_set = Some(match doc_id_set {
+                        Some(existing) => existing.intersection(&docs_set).cloned().collect(),
+                        None => docs_set,
+                    });
+
+                    if let Some(ref set) = doc_id_set {
+                        if set.is_empty() {
+                            break;
+                        }
+                    }
+                }
+
+                let matching_doc_ids: HashSet<Uuid> = doc_id_set.unwrap_or_default();
+
+                if matching_doc_ids.is_empty() {
+                    return Ok(Json(vec![]));
+                }
+
+                let new_filter = match &filter_ids {
+                    Some(existing) => existing.intersection(&matching_doc_ids).copied().collect(),
+                    None => matching_doc_ids.clone(),
+                };
+
+                filter_ids = Some(new_filter);
+            }
+        }
+    }
+
     if let Some(ref set) = filter_ids {
         if set.is_empty() {
             return Ok(Json(vec![]));

backend/src/routes/mod.rs

@@ -15,6 +15,7 @@ pub mod documents;
 pub mod folders;
 pub mod health;
 pub mod tags;
+pub mod webdav;
 
 pub fn create_router(state: AppState) -> Router<()> {
     let cors = if let Some(origins) = state.config.cors_allowed_origin.as_ref() {
@@ -59,6 +60,10 @@ pub fn create_router(state: AppState) -> Router<()> {
         .route("/reanalyze", post(documents::reanalyze_all_documents))
         .route("/bulk/move", post(documents::bulk_move_documents))
         .route("/bulk/tags", post(documents::bulk_update_tags))
+        .route(
+            "/bulk/correspondents",
+            post(documents::bulk_assign_correspondents),
+        )
         .route(
             "/bulk/reanalyze",
             post(documents::reanalyze_selected_documents),
@@ -125,9 +130,9 @@ pub fn create_router(state: AppState) -> Router<()> {
 
     Router::new()
         .merge(download_routes)
+        .merge(protected_routes)
         .nest("/api/auth", auth_routes)
         .route("/api/health", get(health::health_check))
-        .merge(protected_routes)
         .with_state(state)
         .layer(cors)
         .layer(DefaultBodyLimit::max(1024 * 1024 * 512))

backend/src/routes/webdav/mod.rs

@@ -0,0 +1,808 @@
+use std::time::Duration;
+
+use axum::body::Body;
+use axum::extract::State;
+use axum::http::{header, HeaderMap, Method, StatusCode};
+use axum::response::Response;
+use axum::Router;
+use base64::engine::general_purpose::STANDARD as BASE64;
+use base64::Engine;
+use diesel::prelude::*;
+use diesel::PgConnection;
+use futures_util::StreamExt;
+use percent_encoding::{percent_decode_str, utf8_percent_encode, NON_ALPHANUMERIC};
+use quick_xml::events::{BytesDecl, BytesEnd, BytesStart, BytesText, Event};
+use quick_xml::Writer;
+use uuid::Uuid;
+
+use crate::auth::password;
+use crate::error::{AppError, AppResult};
+use crate::models::{Document, DocumentVersion, Folder, User};
+use crate::schema::{
+    document_versions::dsl as document_versions_dsl, documents::dsl as documents_dsl,
+    folders::dsl as folders_dsl, users::dsl as users_dsl,
+};
+use crate::state::AppState;
+
+const REALM: &str = "Papercrate WebDAV";
+const DOWNLOAD_URL_TTL_SECONDS: u64 = 300;
+
+#[derive(Clone, Debug)]
+struct WebDavUser {
+    _user_id: Uuid,
+    _username: String,
+}
+
+pub fn create_router() -> Router<AppState> {
+    Router::new().fallback(webdav_entrypoint)
+}
+
+async fn webdav_entrypoint(
+    State(state): State<AppState>,
+    req: axum::http::Request<axum::body::Body>,
+) -> Result<Response, AppError> {
+    let method = req.method().clone();
+    let headers = req.headers().clone();
+    let path = req.uri().path().trim_start_matches('/').to_string();
+
+    tracing::debug!(method = %method, %path, "webdav entrypoint" );
+
+    match method {
+        ref m if m == Method::OPTIONS => Ok(handle_options()),
+        ref m if m == Method::GET => handle_get_or_head(&state, &path, headers, Method::GET).await,
+        ref m if m == Method::HEAD => {
+            handle_get_or_head(&state, &path, headers, Method::HEAD).await
+        }
+        _ => {
+            if method.as_str() == "PROPFIND" {
+                handle_propfind(&state, &path, headers).await
+            } else {
+                Ok(method_not_allowed())
+            }
+        }
+    }
+}
+
+async fn handle_propfind(
+    state: &AppState,
+    path: &str,
+    headers: HeaderMap,
+) -> Result<Response, AppError> {
+    let _user = match authenticate(state, &headers)? {
+        Some(user) => user,
+        None => return Ok(unauthorized_response()),
+    };
+
+    let depth = match parse_depth(&headers) {
+        Ok(value) => value,
+        Err(response) => return Ok(response),
+    };
+
+    let segments = parse_segments(path)?;
+    let resolution = match resolve_path(state, &segments)? {
+        Some(resolved) => resolved,
+        None => return Ok(not_found_response()),
+    };
+
+    let resources = match resolution {
+        ResolvedPath::Root => {
+            let contents = fetch_folder_contents(state, None)?;
+            build_resources_for_folder(None, &[], &contents, depth)
+        }
+        ResolvedPath::Folder { folder, chain } => {
+            let contents = fetch_folder_contents(state, Some(folder.id))?;
+            build_resources_for_folder(Some(&folder), &chain, &contents, depth)
+        }
+        ResolvedPath::Document {
+            document,
+            version,
+            chain,
+        } => build_resources_for_document(&chain, &document, &version),
+    };
+
+    let body = render_multistatus(&resources)
+        .map_err(|err| AppError::internal(format!("failed to render WebDAV response: {err}")))?;
+
+    let response = Response::builder()
+        .status(multi_status())
+        .header(header::CONTENT_TYPE, "application/xml; charset=utf-8")
+        .body(Body::from(body))
+        .expect("valid response");
+
+    Ok(response)
+}
+
+async fn handle_get_or_head(
+    state: &AppState,
+    path: &str,
+    headers: HeaderMap,
+    method: Method,
+) -> Result<Response, AppError> {
+    let _user = match authenticate(state, &headers)? {
+        Some(user) => user,
+        None => return Ok(unauthorized_response()),
+    };
+
+    let segments = parse_segments(path)?;
+    let resolution = match resolve_path(state, &segments)? {
+        Some(resolved) => resolved,
+        None => return Ok(not_found_response()),
+    };
+
+    let (document, version, chain) = match resolution {
+        ResolvedPath::Document {
+            document,
+            version,
+            chain,
+        } => (document, version, chain),
+        _ => return Ok(method_not_allowed()),
+    };
+
+    stream_document(state, &document, &version, &chain, headers, method).await
+}
+
+fn handle_options() -> Response {
+    Response::builder()
+        .status(StatusCode::OK)
+        .header("DAV", "1,2")
+        .header(header::ALLOW, "OPTIONS, PROPFIND, GET, HEAD")
+        .header("Accept-Ranges", "bytes")
+        .body(Body::empty())
+        .expect("valid OPTIONS response")
+}
+
+fn method_not_allowed() -> Response {
+    Response::builder()
+        .status(StatusCode::METHOD_NOT_ALLOWED)
+        .body(Body::empty())
+        .expect("valid response")
+}
+
+fn not_found_response() -> Response {
+    Response::builder()
+        .status(StatusCode::NOT_FOUND)
+        .body(Body::empty())
+        .expect("valid response")
+}
+
+fn unauthorized_response() -> Response {
+    Response::builder()
+        .status(StatusCode::UNAUTHORIZED)
+        .header(
+            header::WWW_AUTHENTICATE,
+            format!("Basic realm=\"{REALM}\", charset=\"UTF-8\""),
+        )
+        .body(Body::empty())
+        .expect("valid response")
+}
+
+fn multi_status() -> StatusCode {
+    StatusCode::from_u16(207).expect("valid multi-status")
+}
+
+fn parse_depth(headers: &HeaderMap) -> Result<u8, Response> {
+    match headers.get("Depth") {
+        None => Ok(1),
+        Some(value) => match value.to_str() {
+            Ok("0") => Ok(0),
+            Ok("1") => Ok(1),
+            Ok("infinity") => Err(Response::builder()
+                .status(StatusCode::FORBIDDEN)
+                .body(Body::empty())
+                .expect("valid response")),
+            _ => Err(Response::builder()
+                .status(StatusCode::BAD_REQUEST)
+                .body(Body::empty())
+                .expect("valid response")),
+        },
+    }
+}
+
+fn parse_segments(path: &str) -> AppResult<Vec<String>> {
+    if path.trim_matches('/').is_empty() {
+        return Ok(vec![]);
+    }
+
+    let segments = path
+        .split('/')
+        .filter(|segment| !segment.is_empty())
+        .map(|segment| {
+            percent_decode_str(segment)
+                .decode_utf8()
+                .map(|cow| cow.into_owned())
+                .map_err(|_| AppError::bad_request("invalid UTF-8 in path"))
+        })
+        .collect::<Result<Vec<_>, _>>()?;
+
+    Ok(segments)
+}
+
+fn fetch_folder_contents(
+    state: &AppState,
+    folder_id: Option<Uuid>,
+) -> AppResult<WebDavFolderContents> {
+    let mut conn = state.db()?;
+
+    let folder = match folder_id {
+        Some(id) => Some(folders_dsl::folders.find(id).first::<Folder>(&mut conn)?),
+        None => None,
+    };
+
+    let subfolders: Vec<Folder> = match folder_id {
+        Some(id) => folders_dsl::folders
+            .filter(folders_dsl::parent_id.eq(Some(id)))
+            .order(folders_dsl::name.asc())
+            .load(&mut conn)?,
+        None => folders_dsl::folders
+            .filter(folders_dsl::parent_id.is_null())
+            .order(folders_dsl::name.asc())
+            .load(&mut conn)?,
+    };
+
+    let mut docs_query = documents_dsl::documents
+        .filter(documents_dsl::deleted_at.is_null())
+        .into_boxed();
+
+    docs_query = match folder_id {
+        Some(id) => docs_query.filter(documents_dsl::folder_id.eq(Some(id))),
+        None => docs_query.filter(documents_dsl::folder_id.is_null()),
+    };
+
+    let documents: Vec<Document> = docs_query
+        .order(documents_dsl::uploaded_at.desc())
+        .load(&mut conn)?;
+
+    let version_ids: Vec<Uuid> = documents.iter().map(|doc| doc.current_version_id).collect();
+    let versions: Vec<DocumentVersion> = if version_ids.is_empty() {
+        Vec::new()
+    } else {
+        document_versions_dsl::document_versions
+            .filter(document_versions_dsl::id.eq_any(&version_ids))
+            .load(&mut conn)?
+    };
+
+    let mut version_map = versions
+        .into_iter()
+        .map(|version| (version.id, version))
+        .collect::<std::collections::HashMap<_, _>>();
+
+    let mut entries = Vec::with_capacity(documents.len());
+    for document in documents {
+        if let Some(version) = version_map.remove(&document.current_version_id) {
+            entries.push(DocumentEntry { document, version });
+        }
+    }
+
+    Ok(WebDavFolderContents {
+        _folder: folder,
+        subfolders,
+        documents: entries,
+    })
+}
+
+async fn stream_document(
+    state: &AppState,
+    document: &Document,
+    version: &DocumentVersion,
+    _chain: &[String],
+    headers: HeaderMap,
+    method: Method,
+) -> Result<Response, AppError> {
+    let range_header = headers.get(header::RANGE).cloned();
+
+    let url = state
+        .storage
+        .presign_get_object(
+            &version.s3_key,
+            Duration::from_secs(DOWNLOAD_URL_TTL_SECONDS),
+        )
+        .await
+        .map_err(|err| AppError::internal(format!("failed to presign document download: {err}")))?;
+
+    let client = reqwest::Client::new();
+    let mut request = client.request(method.clone(), url.clone());
+
+    if let Some(range) = range_header.clone() {
+        request = request.header(header::RANGE, range.clone());
+    }
+
+    let upstream = request
+        .send()
+        .await
+        .map_err(|err| AppError::internal(format!("failed to fetch document stream: {err}")))?;
+
+    let status =
+        StatusCode::from_u16(upstream.status().as_u16()).unwrap_or(StatusCode::BAD_GATEWAY);
+
+    if !(status.is_success() || status == StatusCode::PARTIAL_CONTENT) {
+        return Err(AppError::internal(format!(
+            "upstream download returned status {status}"
+        )));
+    }
+
+    let mut builder = Response::builder().status(status);
+
+    if let Some(content_type) = upstream.headers().get(header::CONTENT_TYPE) {
+        builder = builder.header(header::CONTENT_TYPE, content_type);
+    } else if let Some(ref typ) = document.content_type {
+        builder = builder.header(header::CONTENT_TYPE, typ);
+    }
+
+    if let Some(content_length) = upstream.headers().get(header::CONTENT_LENGTH) {
+        builder = builder.header(header::CONTENT_LENGTH, content_length);
+    }
+
+    if let Some(range) = upstream.headers().get(header::CONTENT_RANGE) {
+        builder = builder.header(header::CONTENT_RANGE, range);
+    }
+
+    builder = builder.header("Accept-Ranges", "bytes");
+
+    if let Some(disposition) = content_disposition(&document.filename) {
+        builder = builder.header(header::CONTENT_DISPOSITION, disposition);
+    }
+
+    builder = builder.header(header::ETAG, format!("\"{}\"", version.id));
+
+    if method == Method::HEAD {
+        return builder
+            .body(Body::empty())
+            .map_err(|err| AppError::internal(format!("failed to build response: {err}")));
+    }
+
+    let stream = upstream
+        .bytes_stream()
+        .map(|chunk| chunk.map_err(|err| std::io::Error::new(std::io::ErrorKind::Other, err)));
+    let body = Body::from_stream(stream);
+
+    builder
+        .body(body)
+        .map_err(|err| AppError::internal(format!("failed to build response: {err}")))
+}
+
+fn authenticate(state: &AppState, headers: &HeaderMap) -> Result<Option<WebDavUser>, AppError> {
+    tracing::debug!("webdav authenticate invoked");
+    let authorization = match headers.get(header::AUTHORIZATION) {
+        Some(value) => match value.to_str() {
+            Ok(header) if header.starts_with("Basic ") => {
+                tracing::debug!("authorization header present");
+                &header[6..]
+            }
+            Ok(other) => {
+                tracing::warn!(header = %other, "non-basic authorization header");
+                return Ok(None);
+            }
+            Err(err) => {
+                tracing::warn!(error = %err, "invalid authorization header");
+                return Ok(None);
+            }
+        },
+        None => {
+            tracing::debug!("no authorization header");
+            return Ok(None);
+        }
+    };
+
+    let decoded = match BASE64.decode(authorization) {
+        Ok(bytes) => bytes,
+        Err(err) => {
+            tracing::warn!(error = %err, "failed to decode basic credentials");
+            return Ok(None);
+        }
+    };
+
+    let credential_str = match String::from_utf8(decoded) {
+        Ok(value) => value,
+        Err(err) => {
+            tracing::warn!(error = %err, "invalid utf-8 basic credentials");
+            return Ok(None);
+        }
+    };
+
+    let (username, password) = match credential_str.split_once(':') {
+        Some((username, password)) if !username.is_empty() => (username, password),
+        _ => return Ok(None),
+    };
+
+    tracing::debug!(%username, "attempting webdav login");
+    let mut conn = state.db()?;
+
+    let user: User = match users_dsl::users
+        .filter(users_dsl::username.eq(username))
+        .first(&mut conn)
+    {
+        Ok(user) => user,
+        Err(diesel::result::Error::NotFound) => {
+            tracing::warn!(%username, "webdav user not found");
+            return Ok(None);
+        }
+        Err(err) => return Err(AppError::from(err)),
+    };
+
+    let valid = password::verify_password(password, &user.password_hash)
+        .map_err(|_| AppError::internal("failed to verify password"))?;
+
+    if !valid {
+        tracing::warn!(%username, "webdav password invalid");
+        return Ok(None);
+    }
+
+    tracing::debug!(%username, "webdav login success");
+    Ok(Some(WebDavUser {
+        _user_id: user.id,
+        _username: user.username,
+    }))
+}
+
+fn build_resources_for_folder(
+    folder: Option<&Folder>,
+    chain: &[String],
+    contents: &WebDavFolderContents,
+    depth: u8,
+) -> Vec<DavResource> {
+    let mut resources = Vec::new();
+
+    let display_name = folder
+        .map(|folder| folder.name.clone())
+        .unwrap_or_else(|| "/".to_string());
+
+    let href = build_href(chain, true);
+    let last_modified = folder.map(|folder| format_http_date(folder.updated_at));
+
+    resources.push(DavResource {
+        href,
+        display_name,
+        is_collection: true,
+        content_length: None,
+        content_type: None,
+        last_modified,
+    });
+
+    if depth == 0 {
+        return resources;
+    }
+
+    for subfolder in &contents.subfolders {
+        let mut child_chain = chain.to_vec();
+        child_chain.push(subfolder.name.clone());
+        resources.push(DavResource {
+            href: build_href(&child_chain, true),
+            display_name: subfolder.name.clone(),
+            is_collection: true,
+            content_length: None,
+            content_type: None,
+            last_modified: Some(format_http_date(subfolder.updated_at)),
+        });
+    }
+
+    for entry in &contents.documents {
+        let mut child_chain = chain.to_vec();
+        child_chain.push(entry.document.filename.clone());
+        resources.push(document_to_resource(
+            &child_chain,
+            &entry.document,
+            &entry.version,
+        ));
+    }
+
+    resources
+}
+
+fn build_resources_for_document(
+    chain: &[String],
+    document: &Document,
+    version: &DocumentVersion,
+) -> Vec<DavResource> {
+    vec![document_to_resource(chain, document, version)]
+}
+
+fn document_to_resource(
+    chain: &[String],
+    document: &Document,
+    version: &DocumentVersion,
+) -> DavResource {
+    let href = build_href(chain, false);
+
+    DavResource {
+        href,
+        display_name: document.title.clone(),
+        is_collection: false,
+        content_length: Some(version.size_bytes),
+        content_type: document.content_type.clone(),
+        last_modified: Some(format_http_date(document.updated_at)),
+    }
+}
+
+fn build_href(names: &[String], is_collection: bool) -> String {
+    if names.is_empty() {
+        return "/".to_string();
+    }
+
+    let encoded = names
+        .iter()
+        .map(|name| utf8_percent_encode(name, NON_ALPHANUMERIC).to_string())
+        .collect::<Vec<_>>();
+
+    let mut path = format!("/{}", encoded.join("/"));
+    if is_collection && !path.ends_with('/') {
+        path.push('/');
+    }
+    path
+}
+
+fn render_multistatus(resources: &[DavResource]) -> Result<Vec<u8>, quick_xml::Error> {
+    let mut writer = Writer::new(Vec::new());
+    writer.write_event(Event::Decl(BytesDecl::new("1.0", Some("UTF-8"), None)))?;
+
+    let mut multistatus = BytesStart::new("D:multistatus");
+    multistatus.push_attribute(("xmlns:D", "DAV:"));
+    writer.write_event(Event::Start(multistatus))?;
+
+    for resource in resources {
+        writer.write_event(Event::Start(BytesStart::new("D:response")))?;
+
+        writer.write_event(Event::Start(BytesStart::new("D:href")))?;
+        writer.write_event(Event::Text(BytesText::new(&resource.href)))?;
+        writer.write_event(Event::End(BytesEnd::new("D:href")))?;
+
+        writer.write_event(Event::Start(BytesStart::new("D:propstat")))?;
+        writer.write_event(Event::Start(BytesStart::new("D:prop")))?;
+
+        writer.write_event(Event::Start(BytesStart::new("D:displayname")))?;
+        writer.write_event(Event::Text(BytesText::new(&resource.display_name)))?;
+        writer.write_event(Event::End(BytesEnd::new("D:displayname")))?;
+
+        writer.write_event(Event::Start(BytesStart::new("D:resourcetype")))?;
+        if resource.is_collection {
+            writer.write_event(Event::Empty(BytesStart::new("D:collection")))?;
+        }
+        writer.write_event(Event::End(BytesEnd::new("D:resourcetype")))?;
+
+        if let Some(length) = resource.content_length {
+            writer.write_event(Event::Start(BytesStart::new("D:getcontentlength")))?;
+            writer.write_event(Event::Text(BytesText::new(&length.to_string())))?;
+            writer.write_event(Event::End(BytesEnd::new("D:getcontentlength")))?;
+        }
+
+        if let Some(content_type) = &resource.content_type {
+            writer.write_event(Event::Start(BytesStart::new("D:getcontenttype")))?;
+            writer.write_event(Event::Text(BytesText::new(content_type)))?;
+            writer.write_event(Event::End(BytesEnd::new("D:getcontenttype")))?;
+        }
+
+        if let Some(last_modified) = &resource.last_modified {
+            writer.write_event(Event::Start(BytesStart::new("D:getlastmodified")))?;
+            writer.write_event(Event::Text(BytesText::new(last_modified)))?;
+            writer.write_event(Event::End(BytesEnd::new("D:getlastmodified")))?;
+        }
+
+        writer.write_event(Event::End(BytesEnd::new("D:prop")))?;
+
+        writer.write_event(Event::Start(BytesStart::new("D:status")))?;
+        writer.write_event(Event::Text(BytesText::new("HTTP/1.1 200 OK")))?;
+        writer.write_event(Event::End(BytesEnd::new("D:status")))?;
+
+        writer.write_event(Event::End(BytesEnd::new("D:propstat")))?;
+        writer.write_event(Event::End(BytesEnd::new("D:response")))?;
+    }
+
+    writer.write_event(Event::End(BytesEnd::new("D:multistatus")))?;
+    Ok(writer.into_inner())
+}
+
+fn format_http_date(value: chrono::NaiveDateTime) -> String {
+    let datetime = chrono::DateTime::<chrono::Utc>::from_naive_utc_and_offset(value, chrono::Utc);
+    datetime.format("%a, %d %b %Y %H:%M:%S GMT").to_string()
+}
+
+fn content_disposition(filename: &str) -> Option<String> {
+    if filename.is_empty() {
+        return None;
+    }
+
+    let sanitized: String = filename
+        .chars()
+        .map(|ch| match ch {
+            '"' | '\\' => '_',
+            _ => ch,
+        })
+        .collect();
+
+    let encoded =
+        percent_encoding::utf8_percent_encode(&sanitized, percent_encoding::NON_ALPHANUMERIC);
+    Some(format!(
+        "inline; filename=\"{}\"; filename*=UTF-8''{}",
+        sanitized, encoded
+    ))
+}
+
+struct WebDavFolderContents {
+    _folder: Option<Folder>,
+    subfolders: Vec<Folder>,
+    documents: Vec<DocumentEntry>,
+}
+
+struct DocumentEntry {
+    document: Document,
+    version: DocumentVersion,
+}
+
+struct DavResource {
+    href: String,
+    display_name: String,
+    is_collection: bool,
+    content_length: Option<i64>,
+    content_type: Option<String>,
+    last_modified: Option<String>,
+}
+
+enum ResolvedPath {
+    Root,
+    Folder {
+        folder: Folder,
+        chain: Vec<String>,
+    },
+    Document {
+        document: Document,
+        version: DocumentVersion,
+        chain: Vec<String>,
+    },
+}
+
+fn resolve_path(state: &AppState, segments: &[String]) -> AppResult<Option<ResolvedPath>> {
+    if segments.is_empty() {
+        return Ok(Some(ResolvedPath::Root));
+    }
+
+    let mut conn = state.db()?;
+    let mut parent_id: Option<Uuid> = None;
+    let mut chain: Vec<String> = Vec::new();
+    let mut current_folder: Option<Folder> = None;
+
+    for (index, segment) in segments.iter().enumerate() {
+        let is_last = index == segments.len() - 1;
+
+        match find_folder_by_name(&mut conn, parent_id, segment)? {
+            Some(folder) => {
+                if is_last {
+                    chain.push(folder.name.clone());
+                    return Ok(Some(ResolvedPath::Folder { folder, chain }));
+                }
+
+                parent_id = Some(folder.id);
+                chain.push(folder.name.clone());
+                current_folder = Some(folder);
+                continue;
+            }
+            None => {}
+        }
+
+        if is_last {
+            if let Some((document, version)) =
+                find_document_by_filename(&mut conn, parent_id, segment)?
+            {
+                chain.push(document.filename.clone());
+                return Ok(Some(ResolvedPath::Document {
+                    document,
+                    version,
+                    chain,
+                }));
+            }
+        }
+
+        if let Ok(uuid) = Uuid::parse_str(segment) {
+            if let Some(folder) = folders_dsl::folders
+                .find(uuid)
+                .first::<Folder>(&mut conn)
+                .optional()?
+            {
+                if folder.parent_id != parent_id {
+                    return Ok(None);
+                }
+                if !is_last {
+                    parent_id = Some(folder.id);
+                    chain.push(folder.name.clone());
+                    current_folder = Some(folder);
+                    continue;
+                } else {
+                    chain.push(folder.name.clone());
+                    return Ok(Some(ResolvedPath::Folder { folder, chain }));
+                }
+            }
+
+            if let Some((document, version)) = find_document_by_id(&mut conn, uuid)? {
+                if document.folder_id != parent_id {
+                    return Ok(None);
+                }
+                chain.push(document.filename.clone());
+                return Ok(Some(ResolvedPath::Document {
+                    document,
+                    version,
+                    chain,
+                }));
+            }
+        }
+
+        if is_last {
+            if let Some((document, version)) =
+                find_document_by_filename(&mut conn, parent_id, segment)?
+            {
+                chain.push(document.filename.clone());
+                return Ok(Some(ResolvedPath::Document {
+                    document,
+                    version,
+                    chain,
+                }));
+            }
+        }
+
+        return Ok(None);
+    }
+
+    Ok(current_folder.map(|folder| ResolvedPath::Folder { folder, chain }))
+}
+
+fn find_folder_by_name(
+    conn: &mut PgConnection,
+    parent_id: Option<Uuid>,
+    name: &str,
+) -> AppResult<Option<Folder>> {
+    let result = match parent_id {
+        Some(parent) => folders_dsl::folders
+            .filter(folders_dsl::parent_id.eq(Some(parent)))
+            .filter(folders_dsl::name.eq(name))
+            .first::<Folder>(conn)
+            .optional()?,
+        None => folders_dsl::folders
+            .filter(folders_dsl::parent_id.is_null())
+            .filter(folders_dsl::name.eq(name))
+            .first::<Folder>(conn)
+            .optional()?,
+    };
+
+    Ok(result)
+}
+
+fn find_document_by_filename(
+    conn: &mut PgConnection,
+    parent_id: Option<Uuid>,
+    filename: &str,
+) -> AppResult<Option<(Document, DocumentVersion)>> {
+    let mut query = documents_dsl::documents
+        .filter(documents_dsl::deleted_at.is_null())
+        .filter(documents_dsl::filename.eq(filename))
+        .into_boxed();
+
+    query = match parent_id {
+        Some(parent) => query.filter(documents_dsl::folder_id.eq(Some(parent))),
+        None => query.filter(documents_dsl::folder_id.is_null()),
+    };
+
+    if let Some(document) = query.first::<Document>(conn).optional()? {
+        let version = document_versions_dsl::document_versions
+            .find(document.current_version_id)
+            .first::<DocumentVersion>(conn)?;
+        return Ok(Some((document, version)));
+    }
+
+    Ok(None)
+}
+
+fn find_document_by_id(
+    conn: &mut PgConnection,
+    document_id: Uuid,
+) -> AppResult<Option<(Document, DocumentVersion)>> {
+    if let Some(document) = documents_dsl::documents
+        .filter(documents_dsl::deleted_at.is_null())
+        .find(document_id)
+        .first::<Document>(conn)
+        .optional()?
+    {
+        let version = document_versions_dsl::document_versions
+            .find(document.current_version_id)
+            .first::<DocumentVersion>(conn)?;
+        return Ok(Some((document, version)));
+    }
+
+    Ok(None)
+}