cloud_sdk_reqwest/asynchronous/
client.rs

1use core::fmt;
2use std::sync::Arc;
3
4use cloud_sdk::Method;
5use cloud_sdk::transport::{
6    AsyncTransport, BoundTransport, EndpointIdentity, EndpointIdentityError,
7    ResponseStorageSanitizer, StatusCode, TransportRequest, TransportResponse,
8};
9use cloud_sdk_sanitization::{SecretBuffer, sanitize_bytes};
10use reqwest::header::{AUTHORIZATION, HeaderName, HeaderValue};
11use reqwest::{Body, Client};
12
13use crate::shared::{
14    BearerToken, CredentialStateError, CredentialStore, HttpsEndpoint, TokenRotationError,
15    TransportError, capture_response_headers, parse_rate_limit, parse_response_content_type,
16};
17
18use super::body::SanitizedBuffer;
19
20/// Hardened provider-neutral reqwest asynchronous transport.
21///
22/// The adapter uses reqwest's Tokio-based execution internally but does not
23/// install or own a runtime. Callers must poll it from a compatible executor.
24#[derive(Clone)]
25pub struct AsyncClient {
26    client: Client,
27    endpoint: HttpsEndpoint,
28    credentials: Arc<CredentialStore>,
29}
30
31impl AsyncClient {
32    pub(super) fn new(client: Client, endpoint: HttpsEndpoint, token: BearerToken) -> Self {
33        Self {
34            client,
35            endpoint,
36            credentials: Arc::new(CredentialStore::new(token)),
37        }
38    }
39
40    /// Atomically replaces the bearer token used by newly started requests.
41    ///
42    /// In-flight requests retain their previous snapshot. No credential lock
43    /// is held across network I/O or `.await`.
44    pub fn rotate_bearer_token(
45        &self,
46        replacement: BearerToken,
47    ) -> Result<(), CredentialStateError> {
48        self.credentials.rotate(replacement)
49    }
50
51    /// Validates and rotates from mutable bytes, clearing the complete source
52    /// on success or failure. Rejected input leaves the active token unchanged.
53    pub fn rotate_bearer_token_from_mut_bytes(
54        &self,
55        source: &mut [u8],
56    ) -> Result<(), TokenRotationError> {
57        self.credentials.rotate_from_mut_bytes(source)
58    }
59
60    /// Validates and rotates from guarded storage. Dropping the consumed guard
61    /// clears the complete source on success or failure.
62    pub fn rotate_bearer_token_from_secret_buffer(
63        &self,
64        source: SecretBuffer<'_>,
65    ) -> Result<(), TokenRotationError> {
66        self.credentials.rotate_from_secret_buffer(source)
67    }
68
69    async fn send_inner<'buffer>(
70        &self,
71        request: TransportRequest<'_>,
72        response_body: &'buffer mut [u8],
73    ) -> Result<TransportResponse<'buffer>, TransportError> {
74        sanitize_bytes(response_body);
75        let url = self
76            .endpoint
77            .compose(request.target())
78            .map_err(|_| TransportError::TargetRejected)?;
79        let token_snapshot = self
80            .credentials
81            .snapshot()
82            .map_err(|_| TransportError::CredentialStateUnavailable)?;
83        let authorization = token_snapshot
84            .header_value()
85            .map_err(|_| TransportError::HeaderRejected)?;
86        let mut outbound = self
87            .client
88            .request(map_method(request.method())?, url)
89            .header(AUTHORIZATION, authorization);
90
91        for header in request.headers().as_slice() {
92            let name = HeaderName::from_bytes(header.name().as_str().as_bytes())
93                .map_err(|_| TransportError::HeaderRejected)?;
94            let mut value = HeaderValue::from_str(header.value().as_str())
95                .map_err(|_| TransportError::HeaderRejected)?;
96            value.set_sensitive(matches!(
97                header.sensitivity(),
98                cloud_sdk::transport::HeaderSensitivity::Sensitive
99            ));
100            outbound = outbound.header(name, value);
101        }
102        if !request.body().is_empty() && request.headers().get("content-type").is_none() {
103            return Err(TransportError::MissingContentType);
104        }
105
106        if !request.body().is_empty() {
107            let body = SanitizedBuffer::copy_from(request.body())
108                .map_err(|_| TransportError::RequestBodyAllocationFailed)?;
109            let _ = u64::try_from(request.body().len())
110                .map_err(|_| TransportError::RequestBodyTooLarge)?;
111            outbound = outbound.body(Body::from(body.into_bytes()));
112        }
113
114        let mut response = outbound.send().await.map_err(classify_reqwest_error)?;
115        self.endpoint
116            .verify_origin(response.url())
117            .map_err(|_| TransportError::ResponseOriginChanged)?;
118        if response.content_length().is_some_and(|length| {
119            u64::try_from(response_body.len()).map_or(true, |cap| length > cap)
120        }) {
121            return Err(TransportError::ResponseTooLarge);
122        }
123        let status =
124            StatusCode::new(response.status().as_u16()).ok_or(TransportError::InvalidStatus)?;
125        let buffered = read_response(&mut response, response_body.len()).await?;
126        let headers = capture_response_headers(response.headers())?;
127        let rate_limit = parse_rate_limit(&headers)?;
128        let content_type = parse_response_content_type(&headers)?;
129        let body_len = buffered.len();
130        let initialized = response_body
131            .get_mut(..body_len)
132            .ok_or(TransportError::ResponseReadFailed)?;
133        initialized.copy_from_slice(buffered.as_ref());
134        let response = TransportResponse::new(status, initialized).with_headers(headers);
135        let response = content_type.map_or(response, |value| response.with_content_type(value));
136        drop(token_snapshot);
137        Ok(rate_limit.map_or(response, |value| response.with_rate_limit(value)))
138    }
139}
140
141impl AsyncTransport for AsyncClient {
142    type Error = TransportError;
143
144    async fn send<'transport, 'request, 'buffer>(
145        &'transport self,
146        request: TransportRequest<'request>,
147        response_body: &'buffer mut [u8],
148    ) -> Result<TransportResponse<'buffer>, Self::Error>
149    where
150        'request: 'transport,
151        'buffer: 'transport,
152    {
153        self.send_inner(request, response_body).await
154    }
155}
156
157impl ResponseStorageSanitizer for AsyncClient {
158    fn sanitize_response_storage(&self, response_storage: &mut [u8]) {
159        sanitize_bytes(response_storage);
160    }
161}
162
163impl BoundTransport for AsyncClient {
164    fn endpoint_identity(&self) -> Result<EndpointIdentity<'_>, EndpointIdentityError> {
165        self.endpoint.identity()
166    }
167}
168
169impl fmt::Debug for AsyncClient {
170    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
171        formatter
172            .debug_struct("AsyncClient")
173            .field("endpoint", &"[redacted]")
174            .field("credentials", &"[redacted]")
175            .finish_non_exhaustive()
176    }
177}
178
179async fn read_response(
180    response: &mut reqwest::Response,
181    limit: usize,
182) -> Result<SanitizedBuffer, TransportError> {
183    let mut buffered = SanitizedBuffer::with_capacity(limit)
184        .map_err(|_| TransportError::ResponseBodyAllocationFailed)?;
185    loop {
186        let chunk = response
187            .chunk()
188            .await
189            .map_err(|_| TransportError::ResponseReadFailed)?;
190        let Some(chunk) = chunk else { break };
191        buffered
192            .extend_bounded(&chunk, limit)
193            .map_err(|_| TransportError::ResponseTooLarge)?;
194    }
195    Ok(buffered)
196}
197
198fn map_method(method: Method) -> Result<reqwest::Method, TransportError> {
199    reqwest::Method::from_bytes(method.as_str().as_bytes())
200        .map_err(|_| TransportError::MethodRejected)
201}
202
203fn classify_reqwest_error(error: reqwest::Error) -> TransportError {
204    if error.is_timeout() {
205        TransportError::TimedOut
206    } else if error.is_connect() {
207        TransportError::ConnectFailed
208    } else {
209        TransportError::RequestFailed
210    }
211}
cloud_sdk_reqwest/asynchronous/client.rs

cloud_sdk_reqwest/asynchronous/
client.rs
