Support environment variables in repository credentials (#248)

Author: alekseytomin

README.md

@@ -316,7 +316,10 @@ Using annotations instead of comment directives to configure scripts is cleaner
 
 // also protected artifact repositories are supported, see <https://github.com/holgerbrandl/kscript/blob/master/test/TestsReadme.md#manual-testing>
 // @file:MavenRepository("my-art", "http://localhost:8081/artifactory/authenticated_repo", user="auth_user", password="password")
-
+// You can use environment variables for user and password when string surrounded by double {} brackets 
+// @file:MavenRepository("my-art", "http://localhost:8081/artifactory/authenticated_repo", user="{{ARTIFACTORY_USER}}", password="{{ARTIFACTORY_PASSWORD}}")
+// will be use 'ARTIFACTORY_USER' and 'ARTIFACTORY_PASSWORD' environment variables
+// if the value doesn't found in the script environment  will fail
 
 // Include helper scripts without deployment or prior compilation
 @file:Include("util.kt")

src/main/kotlin/kscript/app/DependencyUtil.kt

@@ -6,7 +6,6 @@ import org.sonatype.aether.artifact.Artifact
 import org.sonatype.aether.repository.Authentication
 import org.sonatype.aether.repository.RemoteRepository
 import org.sonatype.aether.util.artifact.DefaultArtifact
-import org.sonatype.aether.util.artifact.JavaScopes.COMPILE
 import org.sonatype.aether.util.artifact.JavaScopes.RUNTIME
 import java.io.File
 
@@ -68,12 +67,26 @@ fun resolveDependencies(depIds: List<String>, customRepos: List<MavenRepo> = emp
     }
 }
 
+fun decodeEnv(value: String): String {
+    return if (value.startsWith("{{") && value.endsWith("}}")) {
+        val envKey = value.substring(2, value.length - 2)
+        val envValue = System.getenv()[envKey]
+        if (null == envValue) {
+            errorMsg("Could not resolve environment variable {{$envKey}} in maven repository credentials")
+            quit(1)
+        }
+        envValue
+    } else {
+        value
+    }
+}
+
 fun resolveDependenciesViaAether(depIds: List<String>, customRepos: List<MavenRepo>, loggingEnabled: Boolean): List<Artifact> {
     val jcenter = RemoteRepository("jcenter", "default", "http://jcenter.bintray.com/")
     val customRemoteRepos = customRepos.map { mavenRepo ->
         RemoteRepository(mavenRepo.id, "default", mavenRepo.url).apply {
             if (!mavenRepo.user.isNullOrEmpty() && !mavenRepo.password.isNullOrEmpty()) {
-                authentication = Authentication(mavenRepo.user, mavenRepo.password)
+                authentication = Authentication(decodeEnv(mavenRepo.user), decodeEnv(mavenRepo.password))
             }
         }
     }