exception if --privacy-marker-transaction-signing-key-file not specified in non-zero-gas network (#1182)

* exception if min-gas-price > 0 and pmt key file not specified

Signed-off-by: Sally MacFarlane <sally.macfarlane@consensys.net>

besu/src/main/java/org/hyperledger/besu/cli/BesuCommand.java

@@ -909,7 +909,7 @@ public class BesuCommand implements DefaultCommandValues, Runnable {
   @Option(
       names = {"--target-gas-limit"},
       description =
-          "Sets target gas limit per block. If set each blocks gas limit will approach this setting over time if the current gas limit is different.")
+          "Sets target gas limit per block. If set each block's gas limit will approach this setting over time if the current gas limit is different.")
   private final Long targetGasLimit = null;
 
   @Option(
@@ -1882,6 +1882,16 @@ public class BesuCommand implements DefaultCommandValues, Runnable {
         throw new ParameterException(
             commandLine, "Please specify Enclave public key file path to enable privacy");
       }
+
+      if (Wei.ZERO.compareTo(minTransactionGasPrice) < 0) {
+        // if gas is required, cannot use random keys to sign private tx
+        // ie --privacy-marker-transaction-signing-key-file must be set
+        if (privacyMarkerTransactionSigningKeyPath == null) {
+          throw new ParameterException(
+              commandLine,
+              "Not a free gas network. --privacy-marker-transaction-signing-key-file must be specified and must be a funded account. Private transactions cannot be signed by random (non-funded) accounts in paid gas networks");
+        }
+      }
       privacyParametersBuilder.setPrivacyAddress(privacyPrecompiledAddress);
       privacyParametersBuilder.setPrivateKeyPath(privacyMarkerTransactionSigningKeyPath);
       privacyParametersBuilder.setStorageProvider(

besu/src/test/java/org/hyperledger/besu/cli/BesuCommandTest.java

@@ -1540,9 +1540,14 @@ public class BesuCommandTest extends CommandTestAbstract {
     when(storageService.getByName("rocksdb-privacy"))
         .thenReturn(Optional.of(rocksDBSPrivacyStorageFactory));
     final URL configFile = this.getClass().getResource("/orion_publickey.pub");
+    final String coinbaseStr = String.format("%040x", 1);
 
     parseCommand(
         "--privacy-enabled",
+        "--miner-enabled",
+        "--miner-coinbase=" + coinbaseStr,
+        "--min-gas-price",
+        "0",
         "--privacy-url",
         ENCLAVE_URI,
         "--privacy-public-key-file",
@@ -2912,7 +2917,9 @@ public class BesuCommandTest extends CommandTestAbstract {
         "--privacy-url",
         ENCLAVE_URI,
         "--privacy-public-key-file",
-        configFile.getPath());
+        configFile.getPath(),
+        "--min-gas-price",
+        "0");
 
     final ArgumentCaptor<PrivacyParameters> enclaveArg =
         ArgumentCaptor.forClass(PrivacyParameters.class);
@@ -2982,7 +2989,9 @@ public class BesuCommandTest extends CommandTestAbstract {
         "--rpc-http-authentication-enabled",
         "--privacy-multi-tenancy-enabled",
         "--rpc-http-authentication-jwt-public-key-file",
-        "/non/existent/file");
+        "/non/existent/file",
+        "--min-gas-price",
+        "0");
 
     final ArgumentCaptor<PrivacyParameters> privacyParametersArgumentCaptor =
         ArgumentCaptor.forClass(PrivacyParameters.class);
@@ -3023,7 +3032,12 @@ public class BesuCommandTest extends CommandTestAbstract {
 
   @Test
   public void onChainPrivacyGroupEnabledFlagDefaultValueIsFalse() {
-    parseCommand("--privacy-enabled", "--privacy-public-key-file", ENCLAVE_PUBLIC_KEY_PATH);
+    parseCommand(
+        "--privacy-enabled",
+        "--privacy-public-key-file",
+        ENCLAVE_PUBLIC_KEY_PATH,
+        "--min-gas-price",
+        "0");
 
     final ArgumentCaptor<PrivacyParameters> privacyParametersArgumentCaptor =
         ArgumentCaptor.forClass(PrivacyParameters.class);
@@ -3044,7 +3058,9 @@ public class BesuCommandTest extends CommandTestAbstract {
         "--privacy-enabled",
         "--privacy-public-key-file",
         ENCLAVE_PUBLIC_KEY_PATH,
-        "--privacy-onchain-groups-enabled");
+        "--privacy-onchain-groups-enabled",
+        "--min-gas-price",
+        "0");
 
     final ArgumentCaptor<PrivacyParameters> privacyParametersArgumentCaptor =
         ArgumentCaptor.forClass(PrivacyParameters.class);
@@ -3073,6 +3089,15 @@ public class BesuCommandTest extends CommandTestAbstract {
         .startsWith("Privacy multi-tenancy and onchain privacy groups cannot be used together");
   }
 
+  @Test
+  public void privacyMarkerTransactionSigningKeyFileRequiredIfMinGasPriceNonZero() {
+    parseCommand("--privacy-enabled", "--privacy-public-key-file", ENCLAVE_PUBLIC_KEY_PATH);
+
+    assertThat(commandErrorOutput.toString())
+        .startsWith(
+            "Not a free gas network. --privacy-marker-transaction-signing-key-file must be specified");
+  }
+
   private Path createFakeGenesisFile(final JsonObject jsonGenesis) throws IOException {
     final Path genesisFile = Files.createTempFile("genesisFile", "");
     Files.write(genesisFile, encodeJsonGenesis(jsonGenesis).getBytes(UTF_8));