Read env vars for server name and env name

Signed-off-by: Richard Ogin <rogin@users.noreply.github.com>

Author: rogin

server/src/com/mirth/connect/server/Mirth.java

@@ -19,7 +19,6 @@
 import java.sql.DriverManager;
 import java.sql.SQLException;
 import java.util.ArrayList;
-import java.util.Calendar;
 import java.util.List;
 import java.util.Timer;
 import java.util.TimerTask;
@@ -28,10 +27,10 @@
 import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.lang3.math.NumberUtils;
-import org.apache.logging.log4j.ThreadContext;
 import org.apache.logging.log4j.Level;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.ThreadContext;
 import org.apache.logging.log4j.core.Appender;
 import org.apache.logging.log4j.core.filter.Filterable;
 import org.apache.velocity.runtime.RuntimeConstants;
@@ -344,9 +343,11 @@ public void startup() {
             ((org.apache.logging.log4j.core.Logger) velocityLogger).setLevel(Level.OFF);
         }
 
+        configurationController.updateServerSettingsFromEnvironment();
+
         eventController.dispatchEvent(new ServerEvent(configurationController.getServerId(), "Server startup"));
 
-        // Start web server before starting the engine in case there is a 
+        // Start web server before starting the engine in case there is a
         // problem starting the engine that causes it to hang
         startWebServer();
 

server/src/com/mirth/connect/server/controllers/ConfigurationController.java

@@ -360,4 +360,9 @@ public Properties getPropertiesForGroup(String group) {
     public abstract void setChannelTags(Set<ChannelTag> tags);
 
     public abstract Set<ChannelTag> getChannelTags();
+
+    /**
+     * Update server settings based on environment variables.
+     */
+    public abstract void updateServerSettingsFromEnvironment();
 }

server/src/com/mirth/connect/server/controllers/DefaultConfigurationController.java

@@ -41,6 +41,7 @@
 import java.util.Locale;
 import java.util.Map;
 import java.util.Map.Entry;
+import java.util.Optional;
 import java.util.Properties;
 import java.util.Set;
 import java.util.SortedMap;
@@ -74,7 +75,6 @@
 import org.apache.ibatis.session.SqlSessionManager;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
-import org.bouncycastle.asn1.ASN1Sequence;
 import org.bouncycastle.asn1.x500.X500Name;
 import org.bouncycastle.asn1.x509.AuthorityKeyIdentifier;
 import org.bouncycastle.asn1.x509.BasicConstraints;
@@ -1696,4 +1696,38 @@ public ConnectionTestResponse sendTestEmail(Properties properties) throws Except
             return new ConnectionTestResponse(ConnectionTestResponse.Type.FAILURE, e.getMessage());
         }
     }
+
+    @Override
+    public void updateServerSettingsFromEnvironment() {
+        Optional<String> newServerName = getEnvironmentVariable("MC_SERVER_NAME");
+        Optional<String> newEnvName = getEnvironmentVariable("MC_ENV_NAME");
+
+        if (newServerName.isPresent() || newEnvName.isPresent()) {
+            try {
+                ServerSettings serverSettings = getServerSettings();
+
+                if (newServerName.isPresent()) {
+                    serverSettings.setServerName(newServerName.get());
+                }
+                if (newEnvName.isPresent()) {
+                    serverSettings.setEnvironmentName(newEnvName.get());
+                }
+
+                setServerSettings(serverSettings);
+            } catch (ControllerException e) {
+                logger.error("Failed to update server settings via environment variables", e);
+            }
+        }
+    }
+
+    /**
+     * Pull an environment variable. Values are trimmed, and only non-empty values are returned.
+     * 
+     * @param envName the environment variable name
+     * @return the property's value
+     */
+    private Optional<String> getEnvironmentVariable(String envName) {
+        String propValue = StringUtils.trimToEmpty(System.getenv(envName));
+        return StringUtils.isNotBlank(propValue) ? Optional.of(propValue) : Optional.empty();
+    }
 }