cloud_sdk_reqwest/blocking/
client.rs

1use core::fmt;
2use std::io::Read;
3use std::sync::Arc;
4
5use cloud_sdk::Method;
6use cloud_sdk::transport::{
7    BlockingTransport, BoundTransport, EndpointIdentity, EndpointIdentityError, ResponseMetadata,
8    ResponseStorageSanitizer, ResponseWriter, StatusCode, TransportRequest,
9};
10use cloud_sdk_sanitization::{SecretBuffer, sanitize_bytes};
11use reqwest::blocking::{Body, Client};
12use reqwest::header::{AUTHORIZATION, HeaderName, HeaderValue};
13
14use super::body::{ReadBodyError, SanitizedRequestBody, read_bounded};
15use crate::shared::{
16    BearerToken, CredentialStateError, CredentialStore, HttpsEndpoint, TokenRotationError,
17    TransportError, capture_response_headers, parse_rate_limit, parse_response_content_type,
18};
19
20/// Hardened provider-neutral reqwest blocking transport.
21#[derive(Clone)]
22pub struct BlockingClient {
23    client: Client,
24    endpoint: HttpsEndpoint,
25    credentials: Arc<CredentialStore>,
26}
27
28impl BlockingClient {
29    pub(super) fn new(client: Client, endpoint: HttpsEndpoint, token: BearerToken) -> Self {
30        Self {
31            client,
32            endpoint,
33            credentials: Arc::new(CredentialStore::new(token)),
34        }
35    }
36
37    /// Atomically replaces the bearer token used by newly started requests.
38    ///
39    /// In-flight requests retain their previous snapshot. The retired token is
40    /// sanitized after its last request snapshot is dropped.
41    pub fn rotate_bearer_token(
42        &self,
43        replacement: BearerToken,
44    ) -> Result<(), CredentialStateError> {
45        self.credentials.rotate(replacement)
46    }
47
48    /// Validates and rotates from mutable bytes, clearing the complete source
49    /// on success or failure. Rejected input leaves the active token unchanged.
50    pub fn rotate_bearer_token_from_mut_bytes(
51        &self,
52        source: &mut [u8],
53    ) -> Result<(), TokenRotationError> {
54        self.credentials.rotate_from_mut_bytes(source)
55    }
56
57    /// Validates and rotates from guarded storage. Dropping the consumed guard
58    /// clears the complete source on success or failure.
59    pub fn rotate_bearer_token_from_secret_buffer(
60        &self,
61        source: SecretBuffer<'_>,
62    ) -> Result<(), TokenRotationError> {
63        self.credentials.rotate_from_secret_buffer(source)
64    }
65
66    fn send_inner(
67        &self,
68        request: TransportRequest<'_>,
69        response_writer: &mut ResponseWriter<'_>,
70    ) -> Result<(), TransportError> {
71        if response_writer.is_committed() {
72            return Err(TransportError::ResponseCommitFailed);
73        }
74        let url = self
75            .endpoint
76            .compose(request.target())
77            .map_err(|_| TransportError::TargetRejected)?;
78        let method = map_method(request.method())?;
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(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 = SanitizedRequestBody::new(request.body())
108                .map_err(|_| TransportError::RequestBodyAllocationFailed)?;
109            let body_len = u64::try_from(request.body().len())
110                .map_err(|_| TransportError::RequestBodyTooLarge)?;
111            outbound = outbound.body(Body::sized(body, body_len));
112        }
113
114        let mut response = outbound.send().map_err(classify_reqwest_error)?;
115        self.endpoint
116            .verify_origin(response.url())
117            .map_err(|_| TransportError::ResponseOriginChanged)?;
118        let headers = capture_response_headers(response.headers())?;
119        if response.content_length().is_some_and(|length| {
120            u64::try_from(response_writer.body_capacity()).map_or(true, |cap| length > cap)
121        }) {
122            return Err(TransportError::ResponseTooLarge);
123        }
124        let status =
125            StatusCode::new(response.status().as_u16()).ok_or(TransportError::InvalidStatus)?;
126        let rate_limit = parse_rate_limit(&headers)?;
127        let content_type = parse_response_content_type(&headers)?;
128        let body_len = read_response(
129            &mut response,
130            response_writer
131                .body_mut()
132                .map_err(|_| TransportError::ResponseCommitFailed)?,
133        )?;
134        let metadata = ResponseMetadata::EMPTY.with_headers(headers);
135        let metadata = content_type.map_or(metadata, |value| metadata.with_content_type(value));
136        let metadata = rate_limit.map_or(metadata, |value| metadata.with_rate_limit(value));
137        drop(token_snapshot);
138        response_writer
139            .commit(status, body_len, metadata)
140            .map_err(|_| TransportError::ResponseCommitFailed)
141    }
142}
143
144impl BlockingTransport for BlockingClient {
145    type Error = TransportError;
146
147    fn send(
148        &self,
149        request: TransportRequest<'_>,
150        response: &mut ResponseWriter<'_>,
151    ) -> Result<(), Self::Error> {
152        self.send_inner(request, response)
153    }
154}
155
156impl ResponseStorageSanitizer for BlockingClient {
157    fn sanitize_response_storage(&self, response_storage: &mut [u8]) {
158        sanitize_bytes(response_storage);
159    }
160}
161
162impl BoundTransport for BlockingClient {
163    fn endpoint_identity(&self) -> Result<EndpointIdentity<'_>, EndpointIdentityError> {
164        self.endpoint.identity()
165    }
166}
167
168impl fmt::Debug for BlockingClient {
169    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
170        formatter
171            .debug_struct("BlockingClient")
172            .field("endpoint", &"[redacted]")
173            .field("credentials", &"[redacted]")
174            .finish_non_exhaustive()
175    }
176}
177
178fn read_response(response: &mut impl Read, output: &mut [u8]) -> Result<usize, TransportError> {
179    match read_bounded(response, output) {
180        Ok(len) => Ok(len),
181        Err(error) => {
182            sanitize_bytes(output);
183            Err(match error {
184                ReadBodyError::TooLarge => TransportError::ResponseTooLarge,
185                ReadBodyError::ReadFailed => TransportError::ResponseReadFailed,
186            })
187        }
188    }
189}
190
191fn map_method(method: Method) -> Result<reqwest::Method, TransportError> {
192    reqwest::Method::from_bytes(method.as_str().as_bytes())
193        .map_err(|_| TransportError::MethodRejected)
194}
195
196fn classify_reqwest_error(error: reqwest::Error) -> TransportError {
197    if error.is_timeout() {
198        TransportError::TimedOut
199    } else if error.is_connect() {
200        TransportError::ConnectFailed
201    } else {
202        TransportError::RequestFailed
203    }
204}
cloud_sdk_reqwest/blocking/client.rs

cloud_sdk_reqwest/blocking/
client.rs
