oci-api 0.8.0

OCI (Oracle Cloud Infrastructure) API client for Rust
Documentation
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//! OCI HTTP client
//!
//! OCI API HTTP client with custom request signing

use crate::auth::config_loader::ConfigLoader;
use crate::auth::key_loader::KeyLoader;
use crate::auth::providers::{
    ApiKeyAuthProvider, DEFAULT_METADATA_BASE_URL, DEFAULT_REALM_DOMAIN_COMPONENT,
    DynOciAuthProvider, InstancePrincipalAuthProvider, InstancePrincipalConfig, MetadataRegionInfo,
};
use crate::client::request_executor::RequestExecutor;
use crate::client::signer::OciSigner;
use crate::error::{Error, Result};
use crate::services::email::EmailDelivery;
use crate::services::keys::KeysClient;
use crate::services::object_storage::ObjectStorage;
use crate::services::vault::VaultSecretsClient;
use reqwest::{Client, blocking::Client as BlockingClient};
use std::env;
use std::sync::Arc;
use std::time::Duration;

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum AuthMode {
    ApiKey,
    InstancePrincipal,
}

const OCI_METADATA_PROBE_TIMEOUT: Duration = Duration::from_millis(500);
const OCI_METADATA_BOOTSTRAP_TIMEOUT: Duration = Duration::from_secs(2);

/// OCI HTTP client
#[derive(Clone)]
pub struct Oci {
    /// HTTP client
    client: Client,

    /// Region
    region: String,

    /// Realm domain component
    realm_domain_component: String,

    /// Tenancy ID
    tenancy_id: String,

    /// Compartment ID
    compartment_id: Option<String>,

    /// Authentication mode
    auth_mode: AuthMode,
    /// API key signer for compatibility
    signer: Option<OciSigner>,
    /// Authentication provider
    auth_provider: DynOciAuthProvider,
}

impl Default for Oci {
    fn default() -> Self {
        Self::from_env().expect("Failed to create OCI client from environment")
    }
}

impl Oci {
    /// Create new OCI client from environment variables
    pub fn from_env() -> Result<Self> {
        let auth_mode = Self::resolve_auth_mode_from_env()?;

        match auth_mode {
            AuthMode::ApiKey => Self::from_api_key_env(),
            AuthMode::InstancePrincipal => Self::from_instance_principal_env(),
        }
    }

    /// Resolve the OCI auth mode from environment variables and OCI metadata.
    ///
    /// Precedence:
    /// 1. Explicit `OCI_AUTH_MODE` override when provided.
    /// 2. OCI IMDS autodetection with a short timeout.
    /// 3. API key fallback for non-OCI runtimes.
    pub fn resolve_auth_mode_from_env() -> Result<AuthMode> {
        if let Some(auth_mode) = Self::explicit_auth_mode_from_env()? {
            return Ok(auth_mode);
        }

        if Self::autodetect_instance_principal()? {
            return Ok(AuthMode::InstancePrincipal);
        }

        Ok(AuthMode::ApiKey)
    }

    fn from_api_key_env() -> Result<Self> {
        // Step 1: Load partial configuration from OCI_CONFIG if available
        let partial_config = if let Ok(config_value) = env::var("OCI_CONFIG") {
            Some(ConfigLoader::load_partial_from_env_var(&config_value)?)
        } else {
            None
        };

        // Step 2: Merge with individual environment variables (highest priority)
        let user_id = env::var("OCI_USER_ID")
            .ok()
            .or_else(|| partial_config.as_ref().and_then(|c| c.user_id.clone()))
            .ok_or_else(|| {
                Error::EnvError(
                    "OCI_USER_ID must be set (either directly or via OCI_CONFIG)".to_string(),
                )
            })?;

        let tenancy_id = env::var("OCI_TENANCY_ID")
            .ok()
            .or_else(|| partial_config.as_ref().and_then(|c| c.tenancy_id.clone()))
            .ok_or_else(|| {
                Error::EnvError(
                    "OCI_TENANCY_ID must be set (either directly or via OCI_CONFIG)".to_string(),
                )
            })?;

        let region = env::var("OCI_REGION")
            .ok()
            .or_else(|| partial_config.as_ref().and_then(|c| c.region.clone()))
            .ok_or_else(|| {
                Error::EnvError(
                    "OCI_REGION must be set (either directly or via OCI_CONFIG)".to_string(),
                )
            })?;

        let fingerprint = env::var("OCI_FINGERPRINT")
            .ok()
            .or_else(|| partial_config.as_ref().and_then(|c| c.fingerprint.clone()))
            .ok_or_else(|| {
                Error::EnvError(
                    "OCI_FINGERPRINT must be set (either directly or via OCI_CONFIG)".to_string(),
                )
            })?;

        // Step 3: Load private key
        let private_key = if let Ok(key_input) = env::var("OCI_PRIVATE_KEY") {
            KeyLoader::load(&key_input)?
        } else if let Ok(config_value) = env::var("OCI_CONFIG") {
            let full_config = ConfigLoader::load_from_env_var(&config_value, None)?;
            full_config.private_key
        } else {
            return Err(Error::EnvError(
                "OCI_PRIVATE_KEY must be set (or key_file must be in OCI_CONFIG)".to_string(),
            ));
        };

        // Step 4: Optional compartment ID
        let compartment_id = env::var("OCI_COMPARTMENT_ID").ok();

        Self::builder()
            .auth_mode(AuthMode::ApiKey)
            .user_id(user_id)
            .tenancy_id(tenancy_id)
            .region(region)
            .fingerprint(fingerprint)
            .private_key(private_key)?
            .compartment_id_opt(compartment_id)
            .build()
    }

    fn from_instance_principal_env() -> Result<Self> {
        let metadata_base_url = env::var("OCI_METADATA_BASE_URL").ok();
        let metadata_client = Self::blocking_metadata_client(OCI_METADATA_BOOTSTRAP_TIMEOUT)?;
        let metadata_region_info =
            Self::metadata_region_info(&metadata_client, metadata_base_url.as_deref());

        Self::from_instance_principal_env_with(
            &metadata_client,
            metadata_base_url,
            metadata_region_info,
        )
    }

    fn from_instance_principal_env_with(
        metadata_client: &BlockingClient,
        metadata_base_url: Option<String>,
        metadata_region_info: Option<MetadataRegionInfo>,
    ) -> Result<Self> {
        let region = env::var("OCI_REGION")
            .ok()
            .or_else(|| {
                metadata_region_info
                    .as_ref()
                    .map(|region_info| region_info.region_identifier.clone())
            })
            .ok_or_else(|| {
                Error::EnvError(
                    "OCI_REGION must be set or discoverable from OCI metadata when OCI_AUTH_MODE=instance_principal"
                        .to_owned(),
                )
            })?;
        let tenancy_id = env::var("OCI_TENANCY_ID")
            .ok()
            .or_else(|| {
                InstancePrincipalAuthProvider::tenancy_id_from_metadata_certificate_blocking(
                    &metadata_client,
                    metadata_base_url
                        .as_deref()
                        .unwrap_or(DEFAULT_METADATA_BASE_URL),
                )
                .ok()
            })
            .ok_or_else(|| {
                Error::EnvError(
                    "OCI_TENANCY_ID must be set or discoverable from OCI metadata when OCI_AUTH_MODE=instance_principal"
                        .to_owned(),
                )
            })?;
        let compartment_id = env::var("OCI_COMPARTMENT_ID").ok();
        let realm_domain_component = metadata_region_info
            .as_ref()
            .map(|region_info| region_info.realm_domain_component.clone())
            .unwrap_or_else(|| DEFAULT_REALM_DOMAIN_COMPONENT.to_owned());

        let mut builder = Self::builder()
            .auth_mode(AuthMode::InstancePrincipal)
            .region(region)
            .realm_domain_component(realm_domain_component)
            .tenancy_id(tenancy_id)
            .compartment_id_opt(compartment_id);
        if let Some(metadata_base_url) = metadata_base_url {
            builder = builder.metadata_base_url(metadata_base_url);
        }
        builder.build()
    }

    fn explicit_auth_mode_from_env() -> Result<Option<AuthMode>> {
        let Some(raw_auth_mode) = env::var("OCI_AUTH_MODE").ok() else {
            return Ok(None);
        };
        let auth_mode = raw_auth_mode.trim();
        if auth_mode.is_empty() {
            return Ok(None);
        }

        match auth_mode {
            "api_key" => Ok(Some(AuthMode::ApiKey)),
            "instance_principal" => Ok(Some(AuthMode::InstancePrincipal)),
            other => Err(Error::EnvError(format!(
                "OCI_AUTH_MODE must be 'api_key' or 'instance_principal', got '{other}'"
            ))),
        }
    }

    fn autodetect_instance_principal() -> Result<bool> {
        let metadata_client = Self::blocking_metadata_client(OCI_METADATA_PROBE_TIMEOUT)?;
        let metadata_base_url = env::var("OCI_METADATA_BASE_URL").ok();
        Ok(Self::metadata_region_info(&metadata_client, metadata_base_url.as_deref()).is_some())
    }

    fn metadata_region_info(
        metadata_client: &BlockingClient,
        metadata_base_url: Option<&str>,
    ) -> Option<MetadataRegionInfo> {
        InstancePrincipalAuthProvider::metadata_region_info_blocking(
            metadata_client,
            metadata_base_url.unwrap_or(DEFAULT_METADATA_BASE_URL),
        )
        .ok()
    }

    fn blocking_metadata_client(timeout: Duration) -> Result<BlockingClient> {
        Ok(BlockingClient::builder()
            .connect_timeout(timeout)
            .timeout(timeout)
            .build()?)
    }

    /// Start builder pattern
    pub fn builder() -> OciBuilder {
        OciBuilder::default()
    }

    /// Get request signer
    pub fn signer(&self) -> &OciSigner {
        self.signer
            .as_ref()
            .expect("Oci::signer() is only available in api_key mode")
    }

    /// Return HTTP client reference
    pub fn client(&self) -> &Client {
        &self.client
    }

    pub(crate) fn executor(&self) -> RequestExecutor {
        RequestExecutor::new(self.client.clone(), Arc::clone(&self.auth_provider))
    }

    /// Return region
    pub fn region(&self) -> &str {
        &self.region
    }

    /// Return realm domain component
    pub fn realm_domain(&self) -> &str {
        &self.realm_domain_component
    }

    /// Return tenancy ID
    pub fn tenancy_id(&self) -> &str {
        &self.tenancy_id
    }

    /// Return compartment ID (defaults to tenancy_id if not set)
    pub fn compartment_id(&self) -> &str {
        self.compartment_id.as_ref().unwrap_or(&self.tenancy_id)
    }

    pub fn auth_mode(&self) -> AuthMode {
        self.auth_mode
    }

    /// Create Email Delivery client
    pub async fn email_delivery(&self) -> Result<EmailDelivery> {
        EmailDelivery::new(self.clone()).await
    }

    /// Create Object Storage client
    pub fn object_storage(&self, namespace: impl Into<String>) -> ObjectStorage {
        ObjectStorage::new(self, namespace)
    }

    /// Create Vault Secrets client
    pub fn vault(&self) -> VaultSecretsClient {
        VaultSecretsClient::new(self)
    }

    /// Create Keys client
    pub fn keys(&self, management_endpoint: impl Into<String>) -> KeysClient {
        KeysClient::new(self, management_endpoint)
    }
}

/// OCI client builder
#[derive(Default)]
pub struct OciBuilder {
    user_id: Option<String>,
    tenancy_id: Option<String>,
    region: Option<String>,
    realm_domain_component: Option<String>,
    fingerprint: Option<String>,
    private_key: Option<String>,
    compartment_id: Option<String>,
    auth_mode: AuthMode,
    metadata_base_url: Option<String>,
}

impl OciBuilder {
    /// Load configuration from OCI config file
    pub fn config(mut self, path: impl AsRef<std::path::Path>) -> Result<Self> {
        let loaded = ConfigLoader::load_from_file(path.as_ref(), Some("DEFAULT"))?;

        self.user_id = Some(loaded.user_id);
        self.tenancy_id = Some(loaded.tenancy_id);
        self.region = Some(loaded.region);
        self.fingerprint = Some(loaded.fingerprint);
        self.private_key = Some(loaded.private_key);

        Ok(self)
    }

    pub fn user_id(mut self, user_id: impl Into<String>) -> Self {
        self.user_id = Some(user_id.into());
        self
    }

    pub fn auth_mode(mut self, auth_mode: AuthMode) -> Self {
        self.auth_mode = auth_mode;
        self
    }

    pub fn tenancy_id(mut self, tenancy_id: impl Into<String>) -> Self {
        self.tenancy_id = Some(tenancy_id.into());
        self
    }

    pub fn region(mut self, region: impl Into<String>) -> Self {
        self.region = Some(region.into());
        self
    }

    pub fn realm_domain_component(mut self, realm_domain_component: impl Into<String>) -> Self {
        self.realm_domain_component = Some(realm_domain_component.into());
        self
    }

    pub fn fingerprint(mut self, fingerprint: impl Into<String>) -> Self {
        self.fingerprint = Some(fingerprint.into());
        self
    }

    pub fn private_key(mut self, private_key: impl Into<String>) -> Result<Self> {
        let key_input = private_key.into();
        let loaded_key = KeyLoader::load(&key_input)?;
        self.private_key = Some(loaded_key);
        Ok(self)
    }

    pub fn compartment_id(mut self, compartment_id: impl Into<String>) -> Self {
        self.compartment_id = Some(compartment_id.into());
        self
    }

    // Internal helper for optional compartment_id
    fn compartment_id_opt(mut self, compartment_id: Option<String>) -> Self {
        self.compartment_id = compartment_id;
        self
    }

    pub fn metadata_base_url(mut self, metadata_base_url: impl Into<String>) -> Self {
        self.metadata_base_url = Some(metadata_base_url.into());
        self
    }

    pub fn build(self) -> Result<Oci> {
        let tenancy_id = self
            .tenancy_id
            .ok_or_else(|| Error::ConfigError("tenancy_id is not set".to_string()))?;
        let region = self
            .region
            .ok_or_else(|| Error::ConfigError("region is not set".to_string()))?;
        let realm_domain_component = self
            .realm_domain_component
            .unwrap_or_else(|| DEFAULT_REALM_DOMAIN_COMPONENT.to_owned());
        let client = Client::builder().build()?;

        let (signer, auth_provider) = match self.auth_mode {
            AuthMode::ApiKey => {
                let user_id = self
                    .user_id
                    .ok_or_else(|| Error::ConfigError("user_id is not set".to_owned()))?;
                let fingerprint = self
                    .fingerprint
                    .ok_or_else(|| Error::ConfigError("fingerprint is not set".to_owned()))?;
                let private_key = self
                    .private_key
                    .ok_or_else(|| Error::ConfigError("private_key is not set".to_owned()))?;
                let signer = OciSigner::new(&user_id, &tenancy_id, &fingerprint, &private_key)?;
                let provider =
                    Arc::new(ApiKeyAuthProvider::new(signer.clone())) as DynOciAuthProvider;
                (Some(signer), provider)
            }
            AuthMode::InstancePrincipal => {
                let config = if let Some(metadata_base_url) = self.metadata_base_url {
                    InstancePrincipalConfig::new(region.clone(), tenancy_id.clone())
                        .realm_domain_component(realm_domain_component.clone())
                        .metadata_base_url(metadata_base_url)
                } else {
                    InstancePrincipalConfig::new(region.clone(), tenancy_id.clone())
                        .realm_domain_component(realm_domain_component.clone())
                };
                let provider = Arc::new(InstancePrincipalAuthProvider::new(client.clone(), config))
                    as DynOciAuthProvider;
                (None, provider)
            }
        };

        Ok(Oci {
            client,
            region,
            realm_domain_component,
            tenancy_id,
            compartment_id: self.compartment_id,
            signer,
            auth_mode: self.auth_mode,
            auth_provider,
        })
    }
}

impl Default for AuthMode {
    fn default() -> Self {
        Self::ApiKey
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    use mockito::Server;
    use serial_test::serial;

    const TEST_VALID_PEM: &str = r#"-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----"#;

    const TENANT_CERT_PEM: &str = "-----BEGIN CERTIFICATE-----\n\
MIIDXzCCAkegAwIBAgIUONFqOCNE1N3Aps1ZQaPpY7SQzngwDQYJKoZIhvcNAQEL\n\
BQAwPzEuMCwGA1UECgwlb3BjLXRlbmFudDpvY2lkMS50ZW5hbnR5Lm9jMS4uZXhh\n\
bXBsZTENMAsGA1UEAwwEdGVzdDAeFw0yNjA1MTEwNjQ1NTFaFw0yNjA1MTIwNjQ1\n\
NTFaMD8xLjAsBgNVBAoMJW9wYy10ZW5hbnQ6b2NpZDEudGVuYW5jeS5vYzEuLmV4\n\
YW1wbGUxDTALBgNVBAMMBHRlc3QwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK\n\
AoIBAQDMblfnza9gqREWumv1mTJbR939nQIYZUynTxusVBXciNRjKaqB0jFSUFg9\n\
E2pwtr7G/zr6rpIum9yaRT3O/hhIACP7CJvOoIPTV8qDmNcRnlT78nWBN8jnma1A\n\
T9AZhtR14BJVe03eSSHBTnIDNNDQZu1+p6hUiGPVG1xe/F3/HOwbUrxzsChDnliZ\n\
C46FL0JMIu/uH/Q/iSg0wYsJQKzE+iIvLo5edTeaTvdaTth8XLmltWM2DEwC/fyU\n\
D2lxoOmvBhCVl1OCvT3Db0hMXRVV79BAXNS+qUyKbWnAgkiAMDGmEtYzizAoqCl4\n\
GpDeqNfSI/xo8Zt1RqU1PgleQslDAgMBAAGjUzBRMB0GA1UdDgQWBBRnTn//hXKL\n\
fWGEt7RY27CGihg+DjAfBgNVHSMEGDAWgBRnTn//hXKLfWGEt7RY27CGihg+DjAP\n\
BgNVHRMBAf8EBTADAQH/MA0GCSqGSIb3DQEBCwUAA4IBAQAwRR1OsfwCP1UF4PWK\n\
jQLcBHrwEL7q9/HG47G6IsD4YN365ZPKzv7cOVzL7sPXVs18f3XDZwVNhwMiP2lo\n\
ShLlHDIog2ZMD0kppoZlwf1EdbVVOr30qtHaRpd1/YHY1omuUCdis51iJzO/wMwL\n\
m3yCFx7OCb46vCHwWc+CwiF9I9HKFMJyVpmhsEw91EPH3JaHWW1wn/RSIXuWpX0Q\n\
t+CmwNhI9TC99JL2cfr5lFUjA8nQ5Xx68L9gyfQZ2aicx5XD+s+nt0mgc06oOWv3\n\
ubYEGH/Vy8oK3rEoKdcNVdZUTgA0Fs2g+ItlrBFsJl5A1/TP3f0fbV6j9eY2SpdB\n\
Eo34\n\
-----END CERTIFICATE-----\n";

    struct EnvGuard {
        saved: Vec<(&'static str, Option<String>)>,
    }

    impl EnvGuard {
        fn new(keys: &[&'static str]) -> Self {
            Self {
                saved: keys.iter().map(|key| (*key, env::var(key).ok())).collect(),
            }
        }

        fn set(&self, key: &'static str, value: Option<&str>) {
            unsafe {
                match value {
                    Some(value) => env::set_var(key, value),
                    None => env::remove_var(key),
                }
            }
        }
    }

    impl Drop for EnvGuard {
        fn drop(&mut self) {
            for (key, value) in &self.saved {
                unsafe {
                    match value {
                        Some(value) => env::set_var(key, value),
                        None => env::remove_var(key),
                    }
                }
            }
        }
    }

    #[test]
    #[serial]
    fn resolve_auth_mode_prefers_explicit_api_key_over_oci_autodetect() {
        let mut server = Server::new();
        let _region_info = server
            .mock("GET", "/opc/v2/instance/regionInfo")
            .match_header("authorization", "Bearer Oracle")
            .with_status(200)
            .with_body(
                r#"{"realmKey":"oc1","realmDomainComponent":"oraclecloud.com","regionKey":"PHX","regionIdentifier":"us-phoenix-1"}"#,
            )
            .create();

        let guard = EnvGuard::new(&[
            "OCI_AUTH_MODE",
            "OCI_REGION",
            "OCI_TENANCY_ID",
            "OCI_METADATA_BASE_URL",
            "OCI_COMPARTMENT_ID",
        ]);
        guard.set("OCI_AUTH_MODE", Some("api_key"));
        guard.set("OCI_REGION", None);
        guard.set("OCI_TENANCY_ID", None);
        guard.set(
            "OCI_METADATA_BASE_URL",
            Some(&format!("{}/opc/v2", server.url())),
        );
        guard.set("OCI_COMPARTMENT_ID", None);

        assert_eq!(Oci::resolve_auth_mode_from_env().unwrap(), AuthMode::ApiKey);
    }

    #[test]
    #[serial]
    fn resolve_auth_mode_autodetects_instance_principal_when_metadata_is_reachable() {
        let mut server = Server::new();
        let _region_info = server
            .mock("GET", "/opc/v2/instance/regionInfo")
            .match_header("authorization", "Bearer Oracle")
            .with_status(200)
            .with_body(
                r#"{"realmKey":"oc1","realmDomainComponent":"oraclecloud.com","regionKey":"PHX","regionIdentifier":"us-phoenix-1"}"#,
            )
            .create();

        let guard = EnvGuard::new(&[
            "OCI_AUTH_MODE",
            "OCI_REGION",
            "OCI_TENANCY_ID",
            "OCI_METADATA_BASE_URL",
            "OCI_COMPARTMENT_ID",
        ]);
        guard.set("OCI_AUTH_MODE", None);
        guard.set("OCI_REGION", None);
        guard.set("OCI_TENANCY_ID", None);
        guard.set(
            "OCI_METADATA_BASE_URL",
            Some(&format!("{}/opc/v2", server.url())),
        );
        guard.set("OCI_COMPARTMENT_ID", None);

        assert_eq!(
            Oci::resolve_auth_mode_from_env().unwrap(),
            AuthMode::InstancePrincipal
        );
    }

    #[test]
    #[serial]
    fn resolve_auth_mode_falls_back_to_api_key_when_metadata_is_unavailable() {
        let guard = EnvGuard::new(&[
            "OCI_AUTH_MODE",
            "OCI_REGION",
            "OCI_TENANCY_ID",
            "OCI_METADATA_BASE_URL",
        ]);
        guard.set("OCI_AUTH_MODE", None);
        guard.set("OCI_REGION", None);
        guard.set("OCI_TENANCY_ID", None);
        guard.set("OCI_METADATA_BASE_URL", Some("http://127.0.0.1:9/opc/v2"));

        assert_eq!(Oci::resolve_auth_mode_from_env().unwrap(), AuthMode::ApiKey);
    }

    #[test]
    #[serial]
    fn resolve_auth_mode_treats_empty_override_as_unset() {
        let guard = EnvGuard::new(&["OCI_AUTH_MODE", "OCI_METADATA_BASE_URL"]);
        guard.set("OCI_AUTH_MODE", Some("  "));
        guard.set("OCI_METADATA_BASE_URL", Some("http://127.0.0.1:9/opc/v2"));

        assert_eq!(Oci::resolve_auth_mode_from_env().unwrap(), AuthMode::ApiKey);
    }

    #[test]
    #[serial]
    fn resolve_auth_mode_rejects_invalid_override() {
        let guard = EnvGuard::new(&["OCI_AUTH_MODE"]);
        guard.set("OCI_AUTH_MODE", Some("foo"));

        let error = Oci::resolve_auth_mode_from_env().unwrap_err();
        assert!(matches!(error, Error::EnvError(_)));
        assert!(
            error
                .to_string()
                .contains("OCI_AUTH_MODE must be 'api_key' or 'instance_principal'")
        );
    }

    #[test]
    #[serial]
    fn from_env_autodetects_instance_principal_when_bootstrap_envs_are_missing() {
        let mut server = Server::new();
        let _region_info = server
            .mock("GET", "/opc/v2/instance/regionInfo")
            .match_header("authorization", "Bearer Oracle")
            .with_status(200)
            .with_body(
                r#"{"realmKey":"oc1","realmDomainComponent":"oraclecloud.com","regionKey":"PHX","regionIdentifier":"us-phoenix-1"}"#,
            )
            .create();
        let _leaf_cert = server
            .mock("GET", "/opc/v2/identity/cert.pem")
            .match_header("authorization", "Bearer Oracle")
            .with_status(200)
            .with_body(TENANT_CERT_PEM)
            .create();

        let guard = EnvGuard::new(&[
            "OCI_AUTH_MODE",
            "OCI_REGION",
            "OCI_TENANCY_ID",
            "OCI_METADATA_BASE_URL",
            "OCI_COMPARTMENT_ID",
        ]);
        guard.set("OCI_AUTH_MODE", None);
        guard.set("OCI_REGION", None);
        guard.set("OCI_TENANCY_ID", None);
        guard.set(
            "OCI_METADATA_BASE_URL",
            Some(&format!("{}/opc/v2", server.url())),
        );
        guard.set("OCI_COMPARTMENT_ID", None);

        let oci = Oci::from_env().unwrap();

        assert_eq!(oci.region(), "us-phoenix-1");
        assert_eq!(oci.realm_domain(), "oraclecloud.com");
        assert_eq!(oci.tenancy_id(), "ocid1.tenancy.oc1..example");
        assert_eq!(oci.auth_mode(), AuthMode::InstancePrincipal);
    }

    #[test]
    #[serial]
    fn from_env_uses_explicit_api_key_mode_when_requested() {
        let guard = EnvGuard::new(&[
            "OCI_AUTH_MODE",
            "OCI_USER_ID",
            "OCI_TENANCY_ID",
            "OCI_REGION",
            "OCI_FINGERPRINT",
            "OCI_PRIVATE_KEY",
            "OCI_CONFIG",
        ]);
        guard.set("OCI_AUTH_MODE", Some("api_key"));
        guard.set("OCI_USER_ID", Some("ocid1.user.oc1..example"));
        guard.set("OCI_TENANCY_ID", Some("ocid1.tenancy.oc1..example"));
        guard.set("OCI_REGION", Some("ap-chuncheon-1"));
        guard.set(
            "OCI_FINGERPRINT",
            Some("11:22:33:44:55:66:77:88:99:aa:bb:cc:dd:ee:ff:00"),
        );
        guard.set("OCI_PRIVATE_KEY", Some(TEST_VALID_PEM));
        guard.set("OCI_CONFIG", None);

        let oci = Oci::from_env().unwrap();

        assert_eq!(oci.auth_mode(), AuthMode::ApiKey);
        assert_eq!(oci.region(), "ap-chuncheon-1");
    }
}