Export what a legal hold keeps as a ZIP (LH-12)

inbuxa:HoldExport/set takes a hold, optionally some of the accounts it
covers, and a reason; the collection runs in the background and get
says when it's ready. The ZIP has, per account, mail as .eml under its
folders, calendars as .ics, contacts as .vcf, files as stored, and the
archived items the hold keeps under archived/; a manifest.csv gives each
entry's account, kind, folder, date, whether it was archived, size and
SHA-256, and manifest.sha256 hashes the manifest. Accounts the hold
doesn't cover are left out, and items outside its date range are too:
live mail by arrival, events by start, and archived items the same way,
so an export doesn't carry deleted items that only another hold keeps.

The finished file is a blob of whoever started the export, so only they
download it, and it lasts as long as any upload (uploadTtl). Exports
are records under the hold (SUBSPACE_INBUXA H/e): never changed or
destroyed, each with its status, counts, size and checksum. Starting
one needs sysLegalHoldExport, an active hold and a reason, and is
recorded in the audit log like the audit log's own export.

The build is in memory and capped at 2 GB; bigger holds fail with a
message saying so, and are split by picking accounts.

Tested: unit tests for safe ZIP names and the manifest and its hash;
the legal_hold system test, on RocksDB, PostgreSQL and MySQL, exports a
hold end to end (live and archived mail, the manifest's hash, an asked-
for account the hold doesn't cover left out) and checks the refusals
(no reason, a user without the permission, a released hold) and the
audit record; and by hand from the console on a local server. Not
covered by a test: the archived-item date range with two holds of
different ranges over one account.

crates/jmap-proto/src/object/inbuxa_hold_export.rs

@@ -0,0 +1,211 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Coffey Labs
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+//! `inbuxa:HoldExport/get` and `/set` under `urn:inbuxa:jmap`: collecting
+//! what a legal hold keeps as a ZIP (audit-hold-lock spec, LH-12). Creating
+//! one starts it; it runs in the background, and `get` says when it's ready
+//! and which blob to download. The set call's `reason` says why (AU-12).
+
+use crate::{
+    object::{AnyId, JmapObject, JmapObjectId},
+    request::deserialize::DeserializeArguments,
+};
+use jmap_tools::{Element, Key, Property};
+use std::{borrow::Cow, str::FromStr};
+use types::id::Id;
+
+#[derive(Debug, Clone, Default)]
+pub struct HoldExport;
+
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub enum HoldExportProperty {
+    Id,
+    HoldId,
+    AccountIds,
+    Reason,
+    Status,
+    CreatedAt,
+    CreatedBy,
+    FinishedAt,
+    BlobId,
+    Size,
+    Items,
+    Sha256,
+    Error,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub enum HoldExportValue {
+    Id(Id),
+}
+
+impl Property for HoldExportProperty {
+    fn try_parse(parent: Option<&Key<'_, Self>>, value: &str) -> Option<Self> {
+        match parent {
+            None => HoldExportProperty::parse(value),
+            Some(_) => None,
+        }
+    }
+
+    fn to_cow(&self) -> Cow<'static, str> {
+        match self {
+            HoldExportProperty::Id => "id",
+            HoldExportProperty::HoldId => "holdId",
+            HoldExportProperty::AccountIds => "accountIds",
+            HoldExportProperty::Reason => "reason",
+            HoldExportProperty::Status => "status",
+            HoldExportProperty::CreatedAt => "createdAt",
+            HoldExportProperty::CreatedBy => "createdBy",
+            HoldExportProperty::FinishedAt => "finishedAt",
+            HoldExportProperty::BlobId => "blobId",
+            HoldExportProperty::Size => "size",
+            HoldExportProperty::Items => "items",
+            HoldExportProperty::Sha256 => "sha256",
+            HoldExportProperty::Error => "error",
+        }
+        .into()
+    }
+}
+
+impl HoldExportProperty {
+    fn parse(value: &str) -> Option<Self> {
+        hashify::tiny_map!(value.as_bytes(),
+            b"id" => HoldExportProperty::Id,
+            b"holdId" => HoldExportProperty::HoldId,
+            b"accountIds" => HoldExportProperty::AccountIds,
+            b"reason" => HoldExportProperty::Reason,
+            b"status" => HoldExportProperty::Status,
+            b"createdAt" => HoldExportProperty::CreatedAt,
+            b"createdBy" => HoldExportProperty::CreatedBy,
+            b"finishedAt" => HoldExportProperty::FinishedAt,
+            b"blobId" => HoldExportProperty::BlobId,
+            b"size" => HoldExportProperty::Size,
+            b"items" => HoldExportProperty::Items,
+            b"sha256" => HoldExportProperty::Sha256,
+            b"error" => HoldExportProperty::Error,
+        )
+    }
+}
+
+impl FromStr for HoldExportProperty {
+    type Err = ();
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        HoldExportProperty::parse(s).ok_or(())
+    }
+}
+
+impl Element for HoldExportValue {
+    type Property = HoldExportProperty;
+
+    fn try_parse<P>(key: &Key<'_, Self::Property>, value: &str) -> Option<Self> {
+        match key {
+            Key::Property(HoldExportProperty::Id) => Id::from_str(value).ok().map(HoldExportValue::Id),
+            _ => None,
+        }
+    }
+
+    fn to_cow(&self) -> Cow<'static, str> {
+        match self {
+            HoldExportValue::Id(id) => id.to_string().into(),
+        }
+    }
+}
+
+/// The set call's own arguments: why (AU-12).
+#[derive(Debug, Clone, Default)]
+pub struct HoldExportSetArguments {
+    pub reason: Option<String>,
+}
+
+impl<'de> DeserializeArguments<'de> for HoldExportSetArguments {
+    fn deserialize_argument<A>(&mut self, key: &str, map: &mut A) -> Result<(), A::Error>
+    where
+        A: serde::de::MapAccess<'de>,
+    {
+        if key == "reason" {
+            self.reason = map.next_value()?;
+        } else {
+            let _ = map.next_value::<serde::de::IgnoredAny>()?;
+        }
+        Ok(())
+    }
+}
+
+impl JmapObject for HoldExport {
+    type Property = HoldExportProperty;
+
+    type Element = HoldExportValue;
+
+    type Id = Id;
+
+    type Filter = ();
+
+    type Comparator = ();
+
+    type GetArguments = ();
+
+    type SetArguments<'de> = HoldExportSetArguments;
+
+    type QueryArguments = ();
+
+    type CopyArguments = ();
+
+    type ParseArguments = ();
+
+    const ID_PROPERTY: Self::Property = HoldExportProperty::Id;
+}
+
+impl From<Id> for HoldExportValue {
+    fn from(id: Id) -> Self {
+        HoldExportValue::Id(id)
+    }
+}
+
+impl JmapObjectId for HoldExportValue {
+    fn as_id(&self) -> Option<Id> {
+        match self {
+            HoldExportValue::Id(id) => Some(*id),
+        }
+    }
+
+    fn as_any_id(&self) -> Option<AnyId> {
+        match self {
+            HoldExportValue::Id(id) => Some(AnyId::Id(*id)),
+        }
+    }
+
+    fn as_id_ref(&self) -> Option<&str> {
+        None
+    }
+
+    fn try_set_id(&mut self, new_id: AnyId) -> bool {
+        if let AnyId::Id(id) = new_id {
+            *self = HoldExportValue::Id(id);
+            true
+        } else {
+            false
+        }
+    }
+}
+
+impl JmapObjectId for HoldExportProperty {
+    fn as_id(&self) -> Option<Id> {
+        None
+    }
+
+    fn as_any_id(&self) -> Option<AnyId> {
+        None
+    }
+
+    fn as_id_ref(&self) -> Option<&str> {
+        None
+    }
+
+    fn try_set_id(&mut self, _: AnyId) -> bool {
+        false
+    }
+}

crates/jmap-proto/src/object/mod.rs

@@ -25,6 +25,7 @@ pub mod inbuxa_account_lock; // inbuxa: account lock with delegation
 pub mod inbuxa_ai_limits; // inbuxa: AI spam classification
 pub mod inbuxa_audit; // inbuxa: the audit log
 pub mod inbuxa_legal_hold; // inbuxa: legal hold
+pub mod inbuxa_hold_export; // inbuxa: legal hold exports
 pub mod inbuxa_explanation; // inbuxa: "Explain this" with the local model
 pub mod inbuxa_protocol_policy; // inbuxa: legacy protocols off
 pub mod inbuxa_tenant_protocol_policy; // inbuxa: legacy protocols off, per tenant

crates/jmap-proto/src/references/eval.rs

@@ -73,6 +73,9 @@ impl Response<'_> {
                         GetResponseMethod::LegalHold(response) => {
                             response.eval_jptr(path, &mut results)
                         }
+                        GetResponseMethod::HoldExport(response) => {
+                            response.eval_jptr(path, &mut results)
+                        }
                         GetResponseMethod::ProtocolPolicy(response) => {
                             response.eval_jptr(path, &mut results)
                         }

crates/jmap-proto/src/references/resolve.rs

@@ -50,6 +50,7 @@ impl Response<'_> {
                 GetRequestMethod::AuditSettings(request) => request.resolve_references(self)?,
                 GetRequestMethod::AccountLock(request) => request.resolve_references(self)?,
                 GetRequestMethod::LegalHold(request) => request.resolve_references(self)?,
+                GetRequestMethod::HoldExport(request) => request.resolve_references(self)?,
                 GetRequestMethod::ProtocolPolicy(request) => request.resolve_references(self)?,
                 GetRequestMethod::TenantProtocolPolicy(request) => {
                     request.resolve_references(self)?
@@ -115,6 +116,9 @@ impl Response<'_> {
                 SetRequestMethod::LegalHold(request) => {
                     request.resolve_references(self, 1, false)?
                 }
+                SetRequestMethod::HoldExport(request) => {
+                    request.resolve_references(self, 1, false)?
+                }
                 SetRequestMethod::ProtocolPolicy(request) => {
                     request.resolve_references(self, 1, false)?
                 }

crates/jmap-proto/src/request/method.rs

@@ -60,6 +60,7 @@ pub enum MethodObject {
     AccountLock,
     // inbuxa: legal hold
     LegalHold,
+    HoldExport,
     ProtocolPolicy,
     TenantProtocolPolicy,
 }
@@ -94,7 +95,8 @@ impl MethodObject {
             | MethodObject::AuditExport
             | MethodObject::AuditVerification
             | MethodObject::AccountLock
-            | MethodObject::LegalHold => Capability::Inbuxa,
+            | MethodObject::LegalHold
+            | MethodObject::HoldExport => Capability::Inbuxa,
             MethodObject::ProtocolPolicy => Capability::Inbuxa,
             MethodObject::TenantProtocolPolicy => Capability::Inbuxa,
         }
@@ -284,6 +286,8 @@ impl MethodName {
             (MethodFunction::Set, MethodObject::AccountLock) => "inbuxa:AccountLock/set",
             (MethodFunction::Get, MethodObject::LegalHold) => "inbuxa:LegalHold/get",
             (MethodFunction::Set, MethodObject::LegalHold) => "inbuxa:LegalHold/set",
+            (MethodFunction::Get, MethodObject::HoldExport) => "inbuxa:HoldExport/get",
+            (MethodFunction::Set, MethodObject::HoldExport) => "inbuxa:HoldExport/set",
             (MethodFunction::Set, MethodObject::AuditVerification) => {
                 "inbuxa:AuditVerification/set"
             }
@@ -430,6 +434,8 @@ impl MethodName {
             "inbuxa:AccountLock/set" => (MethodObject::AccountLock, MethodFunction::Set),
             "inbuxa:LegalHold/get" => (MethodObject::LegalHold, MethodFunction::Get),
             "inbuxa:LegalHold/set" => (MethodObject::LegalHold, MethodFunction::Set),
+            "inbuxa:HoldExport/get" => (MethodObject::HoldExport, MethodFunction::Get),
+            "inbuxa:HoldExport/set" => (MethodObject::HoldExport, MethodFunction::Set),
             "inbuxa:AuditVerification/set" => (MethodObject::AuditVerification, MethodFunction::Set),
             "inbuxa:ProtocolPolicy/get" => (MethodObject::ProtocolPolicy, MethodFunction::Get),
             "inbuxa:ProtocolPolicy/set" => (MethodObject::ProtocolPolicy, MethodFunction::Set),
@@ -495,6 +501,7 @@ impl Display for MethodObject {
             MethodObject::AuditVerification => "inbuxa:AuditVerification",
             MethodObject::AccountLock => "inbuxa:AccountLock",
             MethodObject::LegalHold => "inbuxa:LegalHold",
+            MethodObject::HoldExport => "inbuxa:HoldExport",
             MethodObject::ProtocolPolicy => "inbuxa:ProtocolPolicy",
             MethodObject::TenantProtocolPolicy => "inbuxa:TenantProtocolPolicy",
             MethodObject::Registry(obj) => {

crates/jmap-proto/src/request/mod.rs

@@ -120,6 +120,7 @@ pub enum GetRequestMethod {
     AuditSettings(Box<GetRequest<crate::object::inbuxa_audit::AuditSettings>>),
     AccountLock(Box<GetRequest<crate::object::inbuxa_account_lock::AccountLock>>),
     LegalHold(Box<GetRequest<crate::object::inbuxa_legal_hold::LegalHold>>),
+    HoldExport(Box<GetRequest<crate::object::inbuxa_hold_export::HoldExport>>),
     ProtocolPolicy(Box<GetRequest<crate::object::inbuxa_protocol_policy::ProtocolPolicy>>),
     TenantProtocolPolicy(
         Box<GetRequest<crate::object::inbuxa_tenant_protocol_policy::TenantProtocolPolicy>>,
@@ -153,6 +154,7 @@ pub enum SetRequestMethod<'x> {
     AuditVerification(Box<SetRequest<'x, crate::object::inbuxa_audit::AuditVerification>>),
     AccountLock(Box<SetRequest<'x, crate::object::inbuxa_account_lock::AccountLock>>),
     LegalHold(Box<SetRequest<'x, crate::object::inbuxa_legal_hold::LegalHold>>),
+    HoldExport(Box<SetRequest<'x, crate::object::inbuxa_hold_export::HoldExport>>),
     ProtocolPolicy(Box<SetRequest<'x, crate::object::inbuxa_protocol_policy::ProtocolPolicy>>),
     TenantProtocolPolicy(
         Box<SetRequest<'x, crate::object::inbuxa_tenant_protocol_policy::TenantProtocolPolicy>>,

crates/jmap-proto/src/request/parser.rs

@@ -566,6 +566,21 @@ impl<'de> Visitor<'de> for CallVisitor {
                     return Err(de::Error::invalid_length(1, &self));
                 }
             },
+            // inbuxa: legal hold exports
+            (MethodFunction::Get, MethodObject::HoldExport) => match seq.next_element() {
+                Ok(Some(value)) => RequestMethod::Get(GetRequestMethod::HoldExport(value)),
+                Err(err) => RequestMethod::invalid(err),
+                Ok(None) => {
+                    return Err(de::Error::invalid_length(1, &self));
+                }
+            },
+            (MethodFunction::Set, MethodObject::HoldExport) => match seq.next_element() {
+                Ok(Some(value)) => RequestMethod::Set(SetRequestMethod::HoldExport(value)),
+                Err(err) => RequestMethod::invalid(err),
+                Ok(None) => {
+                    return Err(de::Error::invalid_length(1, &self));
+                }
+            },
             // inbuxa: legal hold
             (MethodFunction::Get, MethodObject::LegalHold) => match seq.next_element() {
                 Ok(Some(value)) => RequestMethod::Get(GetRequestMethod::LegalHold(value)),

crates/jmap-proto/src/response/mod.rs

@@ -107,6 +107,7 @@ pub enum GetResponseMethod {
     AuditSettings(GetResponse<crate::object::inbuxa_audit::AuditSettings>),
     AccountLock(GetResponse<crate::object::inbuxa_account_lock::AccountLock>),
     LegalHold(GetResponse<crate::object::inbuxa_legal_hold::LegalHold>),
+    HoldExport(GetResponse<crate::object::inbuxa_hold_export::HoldExport>),
     ProtocolPolicy(GetResponse<crate::object::inbuxa_protocol_policy::ProtocolPolicy>),
     TenantProtocolPolicy(
         GetResponse<crate::object::inbuxa_tenant_protocol_policy::TenantProtocolPolicy>,
@@ -140,6 +141,7 @@ pub enum SetResponseMethod {
     AuditVerification(Box<SetResponse<crate::object::inbuxa_audit::AuditVerification>>),
     AccountLock(Box<SetResponse<crate::object::inbuxa_account_lock::AccountLock>>),
     LegalHold(Box<SetResponse<crate::object::inbuxa_legal_hold::LegalHold>>),
+    HoldExport(Box<SetResponse<crate::object::inbuxa_hold_export::HoldExport>>),
     Explanation(Box<SetResponse<crate::object::inbuxa_explanation::Explanation>>),
     ProtocolPolicy(Box<SetResponse<crate::object::inbuxa_protocol_policy::ProtocolPolicy>>),
     TenantProtocolPolicy(
@@ -780,3 +782,16 @@ impl<'x> From<SetResponse<crate::object::inbuxa_legal_hold::LegalHold>> for Resp
         ResponseMethod::Set(SetResponseMethod::LegalHold(Box::new(value)))
     }
 }
+
+// inbuxa: legal hold exports
+impl<'x> From<GetResponse<crate::object::inbuxa_hold_export::HoldExport>> for ResponseMethod<'x> {
+    fn from(value: GetResponse<crate::object::inbuxa_hold_export::HoldExport>) -> Self {
+        ResponseMethod::Get(GetResponseMethod::HoldExport(value))
+    }
+}
+
+impl<'x> From<SetResponse<crate::object::inbuxa_hold_export::HoldExport>> for ResponseMethod<'x> {
+    fn from(value: SetResponse<crate::object::inbuxa_hold_export::HoldExport>) -> Self {
+        ResponseMethod::Set(SetResponseMethod::HoldExport(Box::new(value)))
+    }
+}