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GH-155: Delegate opening mTLS cert files to build() #783

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GH-155: Delegate opening mTLS cert files to build() #783

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f75d6e5
GH-155: Delegate opening mTLS cert files to `build()`
rtadepalli Jun 5, 2025
ffb76f4
move code around to preserve closing order
rtadepalli Jun 5, 2025
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47 changes: 40 additions & 7 deletions flight/flight-core/src/main/java/org/apache/arrow/flight/FlightServer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -190,9 +190,18 @@ public static final class Builder {
private int maxInboundMessageSize = MAX_GRPC_MESSAGE_SIZE;
private int maxHeaderListSize = MAX_GRPC_MESSAGE_SIZE;
private int backpressureThreshold = DEFAULT_BACKPRESSURE_THRESHOLD;

/*
TODO: Remove certChain/key/mTlsCACert as instance vars and make them local vars in build() after they are
no longer being set in the builder methods.
*/
private File certChainFile;
private InputStream certChain;
private File keyFile;
private InputStream key;
private File mTlsCACertFile;
private InputStream mTlsCACert;

private SslContext sslContext;
private final List<KeyFactory<?>> interceptors;
// Keep track of inserted interceptors
Expand All @@ -213,6 +222,16 @@ public static final class Builder {

/** Create the server for this builder. */
public FlightServer build() {
// Get TLS info in order if the server is being configured to use mTLS.
try {
prepareTlsSettings();
} catch (IOException e) {
closeMTlsCACert();
closeCertChain();
closeKey();
throw new RuntimeException("Could not create FlightServer with mTLS", e);
}

// Add the auth middleware if applicable.
if (headerAuthenticator != CallHeaderAuthenticator.NO_OP) {
this.middleware(
Expand Down Expand Up @@ -442,11 +461,8 @@ private void closeMTlsCACert() {
* @param key The private key to use.
*/
public Builder useTls(final File certChain, final File key) throws IOException {
closeCertChain();
this.certChain = new FileInputStream(certChain);

closeKey();
this.key = new FileInputStream(key);
this.certChainFile = certChain;
this.keyFile = key;

return this;
}
Expand All @@ -457,8 +473,8 @@ public Builder useTls(final File certChain, final File key) throws IOException {
* @param mTlsCACert The CA certificate to use for verifying clients.
*/
public Builder useMTlsClientVerification(final File mTlsCACert) throws IOException {
closeMTlsCACert();
this.mTlsCACert = new FileInputStream(mTlsCACert);
this.mTlsCACertFile = mTlsCACert;

return this;
}

Expand All @@ -468,6 +484,7 @@ public Builder useMTlsClientVerification(final File mTlsCACert) throws IOExcepti
* @param certChain The certificate chain to use.
* @param key The private key to use.
*/
@Deprecated(forRemoval = true, since = "18.4.0")
public Builder useTls(final InputStream certChain, final InputStream key) throws IOException {
closeCertChain();
this.certChain = certChain;
Expand All @@ -483,6 +500,7 @@ public Builder useTls(final InputStream certChain, final InputStream key) throws
*
* @param mTlsCACert The CA certificate to use for verifying clients.
*/
@Deprecated(forRemoval = true, since = "18.4.0")
public Builder useMTlsClientVerification(final InputStream mTlsCACert) throws IOException {
closeMTlsCACert();
this.mTlsCACert = mTlsCACert;
Expand Down Expand Up @@ -552,5 +570,20 @@ public Builder producer(FlightProducer producer) {
this.producer = Preconditions.checkNotNull(producer);
return this;
}

private void prepareTlsSettings() throws IOException {
if (this.mTlsCACertFile != null) {
closeMTlsCACert();
this.mTlsCACert = new FileInputStream(this.mTlsCACertFile);
}
if (this.certChainFile != null) {
closeCertChain();
this.certChain = new FileInputStream(this.certChainFile);
}
if (this.keyFile != null) {
closeKey();
this.key = new FileInputStream(this.keyFile);
}
}
}
}