172 lines
4.7 KiB
Rust
172 lines
4.7 KiB
Rust
//! Helpers to format response data
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use anyhow::{Error};
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use serde_json::{json, Value};
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use hyper::{Body, Response, StatusCode};
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use hyper::header;
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use proxmox_router::{HttpError, RpcEnvironment};
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use proxmox_schema::ParameterError;
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/// Extension to set error message for server side logging
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pub(crate) struct ErrorMessageExtension(pub String);
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/// Methods to format data and errors
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pub trait OutputFormatter: Send + Sync {
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/// Transform json data into a http response
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fn format_data(&self, data: Value, rpcenv: &dyn RpcEnvironment) -> Response<Body>;
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/// Transform errors into a http response
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fn format_error(&self, err: Error) -> Response<Body>;
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/// Transform a [Result] into a http response
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fn format_result(&self, result: Result<Value, Error>, rpcenv: &dyn RpcEnvironment) -> Response<Body> {
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match result {
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Ok(data) => self.format_data(data, rpcenv),
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Err(err) => self.format_error(err),
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}
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}
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}
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static JSON_CONTENT_TYPE: &str = "application/json;charset=UTF-8";
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fn json_data_response(data: Value) -> Response<Body> {
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let json_str = data.to_string();
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let raw = json_str.into_bytes();
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let mut response = Response::new(raw.into());
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response.headers_mut().insert(
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header::CONTENT_TYPE,
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header::HeaderValue::from_static(JSON_CONTENT_TYPE));
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response
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}
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fn add_result_attributes(result: &mut Value, rpcenv: &dyn RpcEnvironment)
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{
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let attributes = match rpcenv.result_attrib().as_object() {
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Some(attr) => attr,
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None => return,
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};
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for (key, value) in attributes {
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result[key] = value.clone();
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}
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}
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struct JsonFormatter();
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/// Format data as ``application/json``
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///
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/// The returned json object contains the following properties:
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///
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/// * ``data``: The result data (on success)
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///
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/// Any result attributes set on ``rpcenv`` are also added to the object.
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///
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/// Errors generates a BAD_REQUEST containing the error
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/// message as string.
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pub static JSON_FORMATTER: &'static dyn OutputFormatter = &JsonFormatter();
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impl OutputFormatter for JsonFormatter {
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fn format_data(&self, data: Value, rpcenv: &dyn RpcEnvironment) -> Response<Body> {
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let mut result = json!({
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"data": data
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});
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add_result_attributes(&mut result, rpcenv);
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json_data_response(result)
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}
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fn format_error(&self, err: Error) -> Response<Body> {
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let mut response = if let Some(apierr) = err.downcast_ref::<HttpError>() {
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let mut resp = Response::new(Body::from(apierr.message.clone()));
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*resp.status_mut() = apierr.code;
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resp
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} else {
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let mut resp = Response::new(Body::from(err.to_string()));
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*resp.status_mut() = StatusCode::BAD_REQUEST;
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resp
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};
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response.headers_mut().insert(
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header::CONTENT_TYPE,
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header::HeaderValue::from_static(JSON_CONTENT_TYPE));
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response.extensions_mut().insert(ErrorMessageExtension(err.to_string()));
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response
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}
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}
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/// Format data as ExtJS compatible ``application/json``
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///
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/// The returned json object contains the following properties:
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///
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/// * ``success``: boolean attribute indicating the success.
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///
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/// * ``data``: The result data (on success)
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///
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/// * ``message``: The error message (on failure)
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///
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/// * ``errors``: detailed list of errors (if available)
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///
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/// Any result attributes set on ``rpcenv`` are also added to the object.
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///
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/// Please note that errors return status code OK, but setting success
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/// to false.
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pub static EXTJS_FORMATTER: &'static dyn OutputFormatter = &ExtJsFormatter();
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struct ExtJsFormatter();
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impl OutputFormatter for ExtJsFormatter {
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fn format_data(&self, data: Value, rpcenv: &dyn RpcEnvironment) -> Response<Body> {
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let mut result = json!({
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"data": data,
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"success": true
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});
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add_result_attributes(&mut result, rpcenv);
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json_data_response(result)
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}
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fn format_error(&self, err: Error) -> Response<Body> {
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let message: String;
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let errors;
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if let Some(param_err) = err.downcast_ref::<ParameterError>() {
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errors = param_err.errors().iter()
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.map(|(name, err)| format!("parameter '{}': {}", name, err))
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.collect();
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message = String::from("parameter verification errors");
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} else {
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errors = vec![];
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message = err.to_string();
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}
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let result = json!({
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"message": message,
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"errors": errors,
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"success": false
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});
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let mut response = json_data_response(result);
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response.extensions_mut().insert(ErrorMessageExtension(message));
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response
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}
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}
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