feat(Maven): Add the ability to dynamically set the provider host/por…

…t from an expression #1412

provider/maven/README.md

@@ -121,6 +121,37 @@ no pact files are loaded after processing all the directories in the list.
 </plugin>
 ```
 
+## Overriding the provider hostname and port when the task is executed (4.2.11+)
+
+Maven supports using expressions in the POM using `${...}`, but these are evaluated when the POM is loaded. 
+
+For the provider hostname and port, you can provide expressions of the form `{{...}}` which will be evaluated
+using JVM system properties when the verify task is run.
+
+For example:
+
+```xml
+<plugin>
+    <groupId>au.com.dius.pact.provider</groupId>
+    <artifactId>maven</artifactId>
+    <version>4.2.11</version>
+    <configuration>
+      <serviceProviders>
+        <serviceProvider>
+          <name>provider</name>
+         <host>{{pact.host}}</host>
+         <port>{{pact.port}}</port>
+          <pactFileDirectories>
+            <pactFileDirectory>path/to/pacts</pactFileDirectory>
+          </pactFileDirectories>
+        </serviceProvider>
+      </serviceProviders>
+    </configuration>
+</plugin>
+```
+
+This will use `pact.host` and `pact.port` system properties.
+
 ## Enabling insecure SSL
 
 For providers that are running on SSL with self-signed certificates, you need to enable insecure SSL mode by setting

provider/maven/src/main/kotlin/au/com/dius/pact/provider/maven/PactProviderMojo.kt

@@ -1,7 +1,10 @@
 package au.com.dius.pact.provider.maven
 
+import au.com.dius.pact.core.model.FileSource
 import au.com.dius.pact.core.pactbroker.ConsumerVersionSelector
 import au.com.dius.pact.core.pactbroker.NotFoundHalResponse
+import au.com.dius.pact.core.support.expressions.DataType
+import au.com.dius.pact.core.support.expressions.ExpressionParser
 import au.com.dius.pact.core.support.handleWith
 import au.com.dius.pact.core.support.toUrl
 import au.com.dius.pact.provider.ConsumerInfo
@@ -54,6 +57,8 @@ open class PactProviderMojo : PactBaseMojo() {
   @Parameter(defaultValue = "console")
   lateinit var reports: List<String>
 
+  private val expressionParser = ExpressionParser("{{", "}}")
+
   override fun execute() {
     systemPropertyVariables.forEach { (property, value) ->
       if (value == null) {
@@ -94,8 +99,22 @@ open class PactProviderMojo : PactBaseMojo() {
 
     try {
       val failures = serviceProviders.flatMap { provider ->
+        provider.host = if (provider.host is String) {
+          expressionParser.parseExpression(provider.host as String, DataType.RAW)
+        } else provider.host
+        provider.port = if (provider.port is String) {
+          expressionParser.parseExpression(provider.port as String, DataType.RAW)
+        } else provider.port
+
         val consumers = mutableListOf<IConsumerInfo>()
-        consumers.addAll(provider.consumers)
+        consumers.addAll(provider.consumers.map {
+          if (it.pactSource is String) {
+            it.pactSource = FileSource(File(it.pactSource as String))
+            it
+          } else {
+            it
+          }
+        })
         if (provider.pactFileDirectory != null) {
           consumers.addAll(loadPactFiles(provider, provider.pactFileDirectory!!))
         }