--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/src/commonMain/kotlin/licensee/LicenseeLicenseInfoRepository.kt	Thu Apr 03 16:08:10 2025 -0400
@@ -0,0 +1,121 @@
+/*
+ * AboutOss is an utility library to retrieve and display
+ * opensource licenses in Android applications.
+ *
+ * Copyright (C) 2023 by Frederic-Charles Barthelery.
+ *
+ * This file is part of AboutOss.
+ *
+ * AboutOss is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * AboutOss is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with AboutOss.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.geekorum.aboutoss.core.licensee
+
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.withContext
+import kotlinx.serialization.ExperimentalSerializationApi
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.Json
+import okio.Source
+import okio.buffer
+
+class LicenseeLicenseInfoRepository(
+    private val produceInput: suspend () -> Source,
+    private val mainCoroutineDispatcher: CoroutineDispatcher,
+    private val ioCoroutineDispatcher: CoroutineDispatcher,
+) {
+
+    private var licensesInfo: Map<String, String>? = null
+
+    suspend fun getLicensesInfo(): Map<String, String> = withContext(mainCoroutineDispatcher) {
+        parseLicenses()
+        checkNotNull(licensesInfo)
+    }
+
+    suspend fun getLicenseFor(dependency: String): String = withContext(mainCoroutineDispatcher) {
+        parseLicenses()
+        checkNotNull(licensesInfo).let {
+            return@withContext it[dependency] ?: error("Dependency not found")
+        }
+    }
+
+    @OptIn(ExperimentalSerializationApi::class)
+    private suspend fun parseLicenses() = withContext(mainCoroutineDispatcher) {
+        if (licensesInfo == null) {
+            val licenses = withContext(ioCoroutineDispatcher) {
+                LicenseeParser(produceInput()).use {
+                    it.readLicensee()
+                }
+            }
+            licensesInfo = licenses
+        }
+    }
+}
+
+
+private class LicenseeParser(
+    input: Source
+): AutoCloseable {
+    private val buffered = input.buffer()
+
+    fun readLicensee(): Map<String, String> {
+        val json = Json {
+            ignoreUnknownKeys = true
+        }
+        val items: List<LicenseItem> = json.decodeFromString(buffered.readUtf8())
+
+        return items.associate {
+            val name = it.name ?: "${it.groupId}:${it.artifactId}"
+            val license = it.spdxLicenses.firstNotNullOfOrNull {
+                "${it.name}\n\n${it.url}"
+            } ?: it.unknownLicenses.firstNotNullOf {
+                "${it.name}\n\n${it.url}"
+            }
+            name to license
+        }
+    }
+
+    override fun close() {
+        buffered.close()
+    }
+}
+
+
+@Serializable
+private data class LicenseItem(
+    val groupId: String,
+    val artifactId: String,
+    val version: String,
+    val spdxLicenses: List<SpdxLicense> = emptyList(),
+    val unknownLicenses: List<UnknownLicense> = emptyList(),
+    val name: String? = null,
+    val scm: Scm? = null,
+)
+
+@Serializable
+private data class SpdxLicense(
+    val identifier: String,
+    val name: String,
+    val url: String,
+)
+
+@Serializable
+private data class UnknownLicense(
+    val name: String,
+    val url: String
+)
+
+@Serializable
+private data class Scm(
+    val url: String,
+)
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