WIP: verify license compatibility

Author: vlsi

plugins/license-gather-plugin/src/main/kotlin/com/github/vlsi/gradle/license/VerifyLicenseCompatibilityTask.kt

@@ -0,0 +1,74 @@
+/*
+ * Copyright 2019 Vladimir Sitnikov <[email protected]>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package com.github.vlsi.gradle.license
+
+import com.github.vlsi.gradle.license.api.License
+import com.github.vlsi.gradle.license.api.LicenseExpression
+import com.github.vlsi.gradle.license.api.SimpleLicense
+import com.github.vlsi.gradle.license.api.asExpression
+import com.github.vlsi.gradle.license.api.disjunctions
+import org.gradle.api.DefaultTask
+import org.gradle.api.artifacts.Configuration
+import org.gradle.api.model.ObjectFactory
+import org.gradle.api.tasks.Input
+import org.gradle.api.tasks.InputFiles
+import org.gradle.api.tasks.OutputFile
+import org.gradle.api.tasks.TaskAction
+import org.gradle.kotlin.dsl.mapProperty
+import org.gradle.kotlin.dsl.resolver.DefaultResolverEventLogger.outputFile
+import org.gradle.kotlin.dsl.setProperty
+import javax.inject.Inject
+
+class VerifyLicenseCompatibilityTask @Inject constructor(
+    objectFactory: ObjectFactory
+) : DefaultTask() {
+    @InputFiles
+    val metadata = objectFactory.fileCollection()
+
+    @Input
+    val acceptableLicenses = objectFactory.setProperty<LicenseExpression>()
+
+    /**
+     * Outputs `OK` when verification is successful.
+     */
+    @OutputFile
+    val outputFile = objectFactory.fileProperty()
+
+    fun allow(license: License) {
+        allow(license.asExpression())
+    }
+
+    fun allow(licenseExpression: LicenseExpression) {
+        acceptableLicenses.add(licenseExpression)
+    }
+
+    @TaskAction
+    fun run() {
+        val dependencies = MetadataStore.load(metadata).dependencies
+        val output = outputFile.get().asFile.apply {
+            parentFile.mkdirs()
+        }
+
+        val okLicenses = acceptableLicenses.get()
+            .flatMapTo(mutableSetOf()) { it.disjunctions() }
+
+        for ((dependency, license) in dependencies) {
+            if (license.)
+        }
+    }
+}