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use jsonschema::Validator;
use serde_json::{Value, json};
use super::messages::A2uiMessage;
#[derive(Debug, Clone, Copy)]
pub enum A2uiSchemaVersion {
V0_9,
V0_8,
}
#[derive(Debug, Clone)]
pub struct A2uiValidationError {
pub message: String,
pub instance_path: String,
}
impl std::fmt::Display for A2uiValidationError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{} at {}", self.message, self.instance_path)
}
}
impl std::error::Error for A2uiValidationError {}
/// Lightweight A2UI schema validator.
///
/// This validates envelope structure and required fields. Component-level
/// validation is intentionally minimal and can be upgraded later with full
/// catalog schema resolution.
pub struct A2uiValidator {
v0_9: Validator,
v0_8: Validator,
}
impl A2uiValidator {
pub fn new() -> Result<Self, A2uiValidationError> {
let v0_9 = Validator::new(&schema_v0_9()).map_err(|e| A2uiValidationError {
message: format!("Invalid v0.9 schema: {}", e),
instance_path: "/".to_string(),
})?;
let v0_8 = Validator::new(&schema_v0_8()).map_err(|e| A2uiValidationError {
message: format!("Invalid v0.8 schema: {}", e),
instance_path: "/".to_string(),
})?;
Ok(Self { v0_9, v0_8 })
}
pub fn validate_message(
&self,
message: &A2uiMessage,
version: A2uiSchemaVersion,
) -> Result<(), Vec<A2uiValidationError>> {
let value = serde_json::to_value(message).map_err(|e| {
vec![A2uiValidationError {
message: format!("Serialization failed: {}", e),
instance_path: "/".to_string(),
}]
})?;
self.validate_value(&value, version)
}
pub fn validate_value(
&self,
value: &Value,
version: A2uiSchemaVersion,
) -> Result<(), Vec<A2uiValidationError>> {
let validator = match version {
A2uiSchemaVersion::V0_9 => &self.v0_9,
A2uiSchemaVersion::V0_8 => &self.v0_8,
};
let mapped = validator
.iter_errors(value)
.map(|e| A2uiValidationError {
message: e.to_string(),
instance_path: e.instance_path.to_string(),
})
.collect::<Vec<_>>();
if !mapped.is_empty() {
return Err(mapped);
}
Ok(())
}
}
fn schema_v0_9() -> Value {
json!({
"type": "object",
"oneOf": [
{
"required": ["createSurface"],
"properties": {
"createSurface": {
"type": "object",
"required": ["surfaceId", "catalogId"],
"properties": {
"surfaceId": { "type": "string" },
"catalogId": { "type": "string" },
"theme": { "type": "object" },
"sendDataModel": { "type": "boolean" }
}
}
}
},
{
"required": ["updateComponents"],
"properties": {
"updateComponents": {
"type": "object",
"required": ["surfaceId", "components"],
"properties": {
"surfaceId": { "type": "string" },
"components": {
"type": "array",
"minItems": 1,
"items": {
"type": "object",
"required": ["id", "component"],
"properties": {
"id": { "type": "string" },
"component": {
"oneOf": [
{ "type": "string" },
{ "type": "object" }
],
"description": "Component discriminator in flat form (\"Text\") or legacy nested object form."
}
}
}
}
}
}
}
},
{
"required": ["updateDataModel"],
"properties": {
"updateDataModel": {
"type": "object",
"required": ["surfaceId"],
"properties": {
"surfaceId": { "type": "string" },
"path": { "type": "string" },
"value": {}
}
}
}
},
{
"required": ["deleteSurface"],
"properties": {
"deleteSurface": {
"type": "object",
"required": ["surfaceId"],
"properties": {
"surfaceId": { "type": "string" }
}
}
}
}
]
})
}
fn schema_v0_8() -> Value {
json!({
"type": "object",
"oneOf": [
{
"required": ["beginRendering"],
"properties": {
"beginRendering": {
"type": "object",
"required": ["surfaceId", "root"],
"properties": {
"surfaceId": { "type": "string" },
"root": { "type": "string" },
"catalogId": { "type": "string" },
"styles": { "type": "object" }
}
}
}
},
{
"required": ["surfaceUpdate"],
"properties": {
"surfaceUpdate": {
"type": "object",
"required": ["surfaceId", "components"],
"properties": {
"surfaceId": { "type": "string" },
"components": {
"type": "array",
"minItems": 1,
"items": {
"type": "object",
"required": ["id", "component"],
"properties": {
"id": { "type": "string" },
"component": { "type": "object" }
}
}
}
}
}
}
},
{
"required": ["dataModelUpdate"],
"properties": {
"dataModelUpdate": {
"type": "object",
"required": ["surfaceId", "contents"],
"properties": {
"surfaceId": { "type": "string" },
"path": { "type": "string" },
"contents": { "type": "array" }
}
}
}
},
{
"required": ["deleteSurface"],
"properties": {
"deleteSurface": {
"type": "object",
"required": ["surfaceId"],
"properties": {
"surfaceId": { "type": "string" }
}
}
}
}
]
})
}
#[cfg(test)]
mod tests {
use super::*;
use crate::a2ui::messages::{
A2uiMessage, CreateSurface, CreateSurfaceMessage, UpdateComponents, UpdateComponentsMessage,
};
use serde_json::json;
#[test]
fn validates_v0_9_create_surface() {
let validator = A2uiValidator::new().unwrap();
let value = json!({
"createSurface": {
"surfaceId": "main",
"catalogId": "catalog"
}
});
assert!(
validator
.validate_value(&value, A2uiSchemaVersion::V0_9)
.is_ok()
);
}
#[test]
fn rejects_invalid_v0_9_message() {
let validator = A2uiValidator::new().unwrap();
let value = json!({ "createSurface": { "catalogId": "missing_surface" } });
assert!(
validator
.validate_value(&value, A2uiSchemaVersion::V0_9)
.is_err()
);
}
#[test]
fn validates_struct_message() {
let validator = A2uiValidator::new().unwrap();
let message = A2uiMessage::CreateSurface(CreateSurfaceMessage {
create_surface: CreateSurface {
surface_id: "main".to_string(),
catalog_id: "catalog".to_string(),
theme: None,
send_data_model: None,
},
});
assert!(
validator
.validate_message(&message, A2uiSchemaVersion::V0_9)
.is_ok()
);
}
#[test]
fn validates_update_components_minimal() {
let validator = A2uiValidator::new().unwrap();
let message = A2uiMessage::UpdateComponents(UpdateComponentsMessage {
update_components: UpdateComponents {
surface_id: "main".to_string(),
components: vec![json!({
"id": "root",
"component": {
"Text": {
"text": { "literalString": "Hello" }
}
}
})],
},
});
assert!(
validator
.validate_message(&message, A2uiSchemaVersion::V0_9)
.is_ok()
);
}
#[test]
fn validates_update_components_flat_shape() {
let validator = A2uiValidator::new().unwrap();
let message = A2uiMessage::UpdateComponents(UpdateComponentsMessage {
update_components: UpdateComponents {
surface_id: "main".to_string(),
components: vec![json!({
"id": "root",
"component": "Text",
"text": "Hello"
})],
},
});
assert!(
validator
.validate_message(&message, A2uiSchemaVersion::V0_9)
.is_ok()
);
}
}