implement server mode, same as joern frontends

build.sbt

@@ -1,5 +1,5 @@
-val cpgVersion   = "1.7.37"
-val joernVersion = "4.0.384"
+val cpgVersion   = "1.7.49"
+val joernVersion = "4.0.444"
 
 val gitCommitString = SettingKey[String]("gitSha")
 

js2cpg.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env sh
 
 SCRIPT_ABS_PATH=$(readlink -f "$0")
-SCRIPT_ABS_DIR=$(dirname $SCRIPT_ABS_PATH)
+SCRIPT_ABS_DIR=$(dirname "$SCRIPT_ABS_PATH")
 
-$SCRIPT_ABS_DIR/target/universal/stage/bin/js2cpg -Dlog4j.configurationFile=$SCRIPT_ABS_DIR/src/main/resources/log4j2.xml $@
+exec "$SCRIPT_ABS_DIR/target/universal/stage/bin/js2cpg" "-Dlog4j.configurationFile=$SCRIPT_ABS_DIR/src/main/resources/log4j2.xml" "$@"

src/main/scala/io/shiftleft/js2cpg/core/Config.scala

@@ -34,6 +34,7 @@ object Config {
   val DEFAULT_WITH_NODE_MODULES_FOLDER: Boolean         = false
   val DEFAULT_OPTIMIZE_DEPENDENCIES: Boolean            = true
   val DEFAULT_FIXED_TRANSPILATION_DEPENDENCIES: Boolean = false
+  val DEFAULT_SERVER_MODE: Boolean                      = false
 
 }
 
@@ -59,7 +60,9 @@ case class Config(
   moduleMode: Option[String] = Config.DEFAULT_MODULE_MODE,
   withNodeModuleFolder: Boolean = Config.DEFAULT_WITH_NODE_MODULES_FOLDER,
   optimizeDependencies: Boolean = Config.DEFAULT_OPTIMIZE_DEPENDENCIES,
-  fixedTranspilationDependencies: Boolean = Config.DEFAULT_FIXED_TRANSPILATION_DEPENDENCIES
+  fixedTranspilationDependencies: Boolean = Config.DEFAULT_FIXED_TRANSPILATION_DEPENDENCIES,
+  serverMode: Boolean = Config.DEFAULT_SERVER_MODE,
+  serverTimeoutSeconds: Option[Int] = None
 ) {
 
   def createPathForPackageJson(): Path = Paths.get(packageJsonLocation) match {

src/main/scala/io/shiftleft/js2cpg/core/Js2CpgMain.scala

@@ -1,9 +1,30 @@
 package io.shiftleft.js2cpg.core
 
+import io.joern.x2cpg.utils.server.FrontendHTTPServer
+
 object Js2CpgMain {
   def main(args: Array[String]): Unit = {
     val argumentsParser = new Js2cpgArgumentsParser()
     argumentsParser.parse(args) match {
+      case Some(config) if config.serverMode =>
+        val server: FrontendHTTPServer = new FrontendHTTPServer(
+          FrontendHTTPServer.defaultExecutor(),
+          arguments => {
+            val config = argumentsParser.parse(arguments)
+            config.foreach(Js2Cpg().run(_))
+          }
+        )
+
+        val port = server.startup()
+        println(s"FrontendHTTPServer started on port $port")
+        try {
+          config.serverTimeoutSeconds match {
+            case Some(value) => server.stopServerAfterTimeout(value)
+            case None        => Thread.sleep(Long.MaxValue)
+          }
+        } finally {
+          server.stop()
+        }
       case Some(config) =>
         new Js2Cpg().run(config)
       case None =>

src/main/scala/io/shiftleft/js2cpg/core/Js2cpgArgumentsParser.scala

@@ -41,6 +41,9 @@ object Js2cpgArgumentsParser {
   val OPTIMIZE_DEPENDENCIES: String            = "optimize-dependencies"
   val ALL_DEPENDENCIES: String                 = "all-dependencies"
   val FIXED_TRANSPILATION_DEPENDENCIES: String = "fixed-transpilation-dependencies"
+  val SERVER_MODE: String                      = "server"
+  val SERVER_MODE_TIMEOUT_MINUTES: String      = "server-timeout-minutes"
+  val ENABLE_EARLY_SCHEMA_CHECKING: String     = "enable-early-schema-checking"
 }
 
 class Js2cpgArgumentsParser {
@@ -203,6 +206,15 @@ class Js2cpgArgumentsParser {
       )
       .action((module, c) => c.copy(moduleMode = Some(module)))
       .hidden()
+    opt[Unit](SERVER_MODE)
+      .action((module, c) => c.copy(serverMode = true))
+      .hidden()
+      .text("runs this frontend in server mode (disabled by default)")
+    opt[Int](SERVER_MODE_TIMEOUT_MINUTES)
+      .action((minutes, c) => c.copy(serverTimeoutSeconds = Some(minutes * 60)))
+      .hidden()
+      .text("timeout after which the server should terminate (use with --server)")
+    opt[Unit](ENABLE_EARLY_SCHEMA_CHECKING).text("does nothing, just here for compat with joern frontends").hidden()
   }
 
   def parse(args: Array[String]): Option[Config] = parser.parse(args, Config())

updateDependencies.sh

@@ -11,6 +11,28 @@ check_installed() {
 
 check_installed curl
 
+# macOS is known to ship 'bash' version < 4
+if [[ "$OSTYPE" == "darwin"* ]]; then
+  BASH_VERSION=`bash --version | grep "GNU bash, version " | awk '{print $4}' | cut -d. -f1`
+  if [[ $BASH_VERSION -lt  4 ]]; then
+    echo "error: 'bash' version detected is less than 4"
+    if [ "$NON_INTERACTIVE_OPTION" == "--non-interactive" ]
+    then
+      echo "update 'bash' using 'brew install bash'? [Y/n]"
+      read ANSWER
+      if [ -z $ANSWER ] || [ "y" == $ANSWER ] || [ "Y" == $ANSWER ]
+      then
+        brew install bash
+      else
+        exit 1
+      fi
+    else
+      echo "error: Please upgrade bash version and re-run"
+      exit 1
+    fi
+  fi
+fi
+
 # check if xmllint is installed
 if type xmllint > /dev/null; then
   USE_XMLLINT=1 #true
@@ -58,13 +80,13 @@ function update {
     if [ "$NON_INTERACTIVE_OPTION" == "--non-interactive" ]
     then
       echo "non-interactive mode, auto-updating $NAME: $OLD_VERSION -> $VERSION"
-      sed -i "s/$SEARCH/$REPLACE/" build.sbt
+      sed -i'.bak' "s/$SEARCH/$REPLACE/" build.sbt
     else
       echo "update $NAME: $OLD_VERSION -> $VERSION? [Y/n]"
       read ANSWER
       if [ -z $ANSWER ] || [ "y" == $ANSWER ] || [ "Y" == $ANSWER ]
       then
-        sed -i "s/$SEARCH/$REPLACE/" build.sbt
+        sed -i'.bak' "s/$SEARCH/$REPLACE/" build.sbt
       fi
     fi
   fi
@@ -77,3 +99,5 @@ else
   DEPENDENCY="${DEPENDENCY#--only=}"
   update $DEPENDENCY
 fi
+
+rm -f build.sbt.bak # Remove back-up files generated by 'sed'