mirror of
https://github.com/meshtastic/Meshtastic-Android.git
synced 2026-05-24 23:01:22 -04:00
fix(flatpak): modernize snapshot URL resolution in source generator (#5552)
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
James Rich
@@ -17,15 +17,14 @@ Previously, this logic was mixed in loose scripts or monolithic build convention
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## Key Features
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### 1. Snapshot Metadata Harvesting
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Standard Maven snapshot repositories (e.g., Sonatype Snapshots) return `404` errors when fetching non-timestamped `-SNAPSHOT` dependencies directly. This plugin dynamically locates and parses local cached `maven-metadata.xml` files inside Gradle's cached directories, resolves the unique timestamped snapshot coordinate, and constructs exact, direct download URLs while preserving local filename bindings.
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### 1. Remote Snapshot Metadata Resolution
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Standard Maven snapshot repositories (e.g., Sonatype Snapshots) return `404` errors when fetching non-timestamped `-SNAPSHOT` dependencies directly. This plugin fetches `maven-metadata.xml` from the remote snapshot repository at generation time, resolves the unique timestamped snapshot coordinate (e.g., `0.2.4-20260520.043744-2`), and constructs exact, direct download URLs while preserving local filename bindings.
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### 2. JitPack URL Routing
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Automatically identifies external dependencies belonging to the `com.github.*` group (hosted on JitPack) and routes their `primaryUrl` to `https://jitpack.io` instead of attempting standard Maven Central lookup, preventing sandboxed download failures.
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### 3. High-Performance Optimizations
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* **Single-Pass Metadata Indexing**: Scans cached metadata files exactly once on-demand, caching them in an in-memory `$O(1)$` lookup map.
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* **Deferred Cryptographic Hashing**: Defers expensive SHA-256 calculation until after candidate files are fully deduplicated and sorted.
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### 3. Automatic Cache Population
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The task automatically depends on `:desktopApp:assemble`, ensuring the Gradle dependency cache is fully populated before scanning. No manual pre-build step is required.
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---
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@@ -39,6 +38,23 @@ plugins {
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}
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```
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### Configuration (DSL)
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All options have sensible defaults. Override as needed:
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```kotlin
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flatpak {
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// Snapshot repository to fetch maven-metadata.xml from
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snapshotRepoUrl.set("https://central.sonatype.com/repository/maven-snapshots")
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// Task that populates the Gradle cache before scanning
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assembleTask.set(":desktopApp:assemble")
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// Custom Gradle cache directory (defaults to ~/.gradle/caches/modules-2/files-2.1)
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cacheDir.set(layout.projectDirectory.dir("my-cache"))
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// Output manifest path
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outputFile.set(layout.projectDirectory.file("flatpak-sources.json"))
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}
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```
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### Running the Generator Task
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Execute the registered custom task to sweep your Gradle local modules cache and generate/overwrite the root `flatpak-sources.json`:
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@@ -47,17 +63,10 @@ Execute the registered custom task to sweep your Gradle local modules cache and
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./gradlew :generateFlatpakSourcesFromCache
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```
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### Custom Cache Directory
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By default, the task scans the standard Gradle user home caches directory (`~/.gradle/caches/modules-2/files-2.1`). You can supply a custom cache directory using the `flatpak.cache.dir` Gradle property:
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```bash
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./gradlew :generateFlatpakSourcesFromCache -Pflatpak.cache.dir="/custom/cache/path"
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```
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---
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## Architecture
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* **[FlatpakConventionPlugin.kt](src/main/kotlin/FlatpakConventionPlugin.kt)**: Registers the `generateFlatpakSourcesFromCache` task using lazy provider configuration.
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* **[GenerateFlatpakSourcesTask.kt](src/main/kotlin/org/meshtastic/flatpak/GenerateFlatpakSourcesTask.kt)**: The native JVM-based custom task responsible for Gradle files scanning, metadata harvesting, and JSON generation.
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* **[FlatpakPlugin.kt](src/main/kotlin/org/meshtastic/flatpak/FlatpakPlugin.kt)**: Registers the `flatpak {}` DSL extension and the `generateFlatpakSourcesFromCache` task using lazy provider configuration.
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* **[FlatpakExtension.kt](src/main/kotlin/org/meshtastic/flatpak/FlatpakExtension.kt)**: DSL extension interface defining all configurable properties.
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* **[GenerateFlatpakSourcesTask.kt](src/main/kotlin/org/meshtastic/flatpak/GenerateFlatpakSourcesTask.kt)**: The custom task responsible for Gradle files scanning, remote metadata resolution, and JSON generation.
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@@ -77,7 +77,7 @@ gradlePlugin {
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plugins {
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register("meshtasticFlatpak") {
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id = "meshtastic.flatpak"
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implementationClass = "FlatpakConventionPlugin"
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implementationClass = "org.meshtastic.flatpak.FlatpakPlugin"
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}
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}
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}
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@@ -8,10 +8,7 @@
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<ID>MagicNumber:GenerateFlatpakSourcesTask.kt:GenerateFlatpakSourcesTask$4</ID>
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<ID>MagicNumber:GenerateFlatpakSourcesTask.kt:GenerateFlatpakSourcesTask$5</ID>
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<ID>MagicNumber:GenerateFlatpakSourcesTask.kt:GenerateFlatpakSourcesTask$8192</ID>
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<ID>MaxLineLength:GenerateFlatpakSourcesTask.kt:GenerateFlatpakSourcesTask$"Gradle cache directory does not exist or is not configured correctly. Please run a build first to populate the cache."</ID>
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<ID>MaxLineLength:GenerateFlatpakSourcesTask.kt:GenerateFlatpakSourcesTask$"Successfully scanned cache and generated ${outputSourcesFile.name} containing ${finalEntries.size} entries."</ID>
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<ID>NestedBlockDepth:GenerateFlatpakSourcesTask.kt:GenerateFlatpakSourcesTask$private fun populateMetadataCache</ID>
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<ID>ReturnCount:GenerateFlatpakSourcesTask.kt:GenerateFlatpakSourcesTask$private fun findSnapshotValue: String?</ID>
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<ID>SwallowedException:GenerateFlatpakSourcesTask.kt:GenerateFlatpakSourcesTask$e: Exception</ID>
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<ID>TooGenericExceptionCaught:GenerateFlatpakSourcesTask.kt:GenerateFlatpakSourcesTask$e: Exception</ID>
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</CurrentIssues>
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@@ -0,0 +1,46 @@
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/*
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* Copyright (c) 2026 Meshtastic LLC
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package org.meshtastic.flatpak
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import org.gradle.api.file.DirectoryProperty
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import org.gradle.api.file.RegularFileProperty
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import org.gradle.api.provider.Property
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/**
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* DSL extension for configuring the Flatpak source manifest generator.
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*
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* ```kotlin
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* flatpak {
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* snapshotRepoUrl.set("https://central.sonatype.com/repository/maven-snapshots")
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* assembleTask.set(":desktopApp:assemble")
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* }
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* ```
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*/
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abstract class FlatpakExtension {
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/** Gradle cache directory to scan for dependency artifacts. */
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abstract val cacheDir: DirectoryProperty
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/** Output path for the generated flatpak-sources.json manifest. */
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abstract val outputFile: RegularFileProperty
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/** Base URL of the Maven snapshot repository (no trailing slash). */
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abstract val snapshotRepoUrl: Property<String>
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/** Task path to depend on, ensuring the cache is fully populated before scanning. */
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abstract val assembleTask: Property<String>
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}
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@@ -14,25 +14,29 @@
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package org.meshtastic.flatpak
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import org.gradle.api.Plugin
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import org.gradle.api.Project
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import org.meshtastic.flatpak.GenerateFlatpakSourcesTask
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import java.io.File
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class FlatpakConventionPlugin : Plugin<Project> {
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class FlatpakPlugin : Plugin<Project> {
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override fun apply(target: Project) {
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with(target) {
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val extension = extensions.create("flatpak", FlatpakExtension::class.java).apply {
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cacheDir.convention(
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layout.dir(providers.provider { File(gradle.gradleUserHomeDir, "caches/modules-2/files-2.1") }),
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)
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outputFile.convention(layout.projectDirectory.file("flatpak-sources.json"))
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snapshotRepoUrl.convention("https://central.sonatype.com/repository/maven-snapshots")
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assembleTask.convention(":desktopApp:assemble")
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}
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tasks.register("generateFlatpakSourcesFromCache", GenerateFlatpakSourcesTask::class.java) {
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val customCachePath = providers.gradleProperty("flatpak.cache.dir").orNull
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if (customCachePath != null) {
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cacheDir.set(layout.projectDirectory.dir(customCachePath))
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} else {
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cacheDir.set(
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layout.dir(providers.provider { File(gradle.gradleUserHomeDir, "caches/modules-2/files-2.1") }),
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)
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}
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outputFile.set(layout.projectDirectory.file("flatpak-sources.json"))
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cacheDir.set(extension.cacheDir)
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outputFile.set(extension.outputFile)
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snapshotRepoUrl.set(extension.snapshotRepoUrl)
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dependsOn(extension.assembleTask)
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}
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}
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}
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@@ -18,29 +18,40 @@ package org.meshtastic.flatpak
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import groovy.json.JsonOutput
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import org.gradle.api.DefaultTask
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import org.gradle.api.GradleException
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import org.gradle.api.file.DirectoryProperty
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import org.gradle.api.file.RegularFileProperty
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import org.gradle.api.tasks.Internal
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import org.gradle.api.provider.Property
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import org.gradle.work.DisableCachingByDefault
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import org.gradle.api.tasks.Input
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import org.gradle.api.tasks.InputDirectory
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import org.gradle.api.tasks.OutputFile
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import org.gradle.api.tasks.PathSensitive
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import org.gradle.api.tasks.PathSensitivity
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import org.gradle.api.tasks.TaskAction
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import org.w3c.dom.Element
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import org.w3c.dom.NodeList
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import java.io.File
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import java.net.URI
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import java.security.MessageDigest
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import javax.xml.parsers.DocumentBuilderFactory
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/** Generates a complete flatpak-sources.json manifest from the local Gradle cache directory. */
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@DisableCachingByDefault(because = "Resolves remote snapshot metadata that may change between runs")
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abstract class GenerateFlatpakSourcesTask : DefaultTask() {
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@get:Internal abstract val cacheDir: DirectoryProperty
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@get:InputDirectory
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@get:PathSensitive(PathSensitivity.RELATIVE)
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abstract val cacheDir: DirectoryProperty
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@get:OutputFile abstract val outputFile: RegularFileProperty
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/** Base URL of the Maven snapshot repository (no trailing slash). */
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@get:Input
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abstract val snapshotRepoUrl: Property<String>
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init {
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group = "flatpak"
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description = "Generates a complete flatpak-sources.json manifest from the local Gradle cache directory."
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// Ensure the task always runs when executed
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outputs.upToDateWhen { false }
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}
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@@ -60,17 +71,14 @@ abstract class GenerateFlatpakSourcesTask : DefaultTask() {
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val mirrorUrls: List<String>,
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)
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private var metadataCache: Map<String, SnapshotMetadata>? = null
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private val remoteMetadataCache = mutableMapOf<String, SnapshotMetadata?>()
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@TaskAction
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fun generate() {
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val cacheFolder =
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cacheDir.orNull?.asFile
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?: throw GradleException(
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"Gradle cache directory does not exist or is not configured correctly. Please run a build first to populate the cache.",
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)
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val cacheFolder = cacheDir.get().asFile
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val outputSourcesFile = outputFile.get().asFile
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val snapshotBase = snapshotRepoUrl.get()
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logger.lifecycle("Scanning Gradle cache directory: ${cacheFolder.absolutePath}")
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val allowedExtensions = setOf("jar", "aar", "pom", "module")
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@@ -93,33 +101,19 @@ abstract class GenerateFlatpakSourcesTask : DefaultTask() {
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val (group, name, version) = parts
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val groupPath = group.replace('.', '/')
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val standardPrefix = "$name-$version"
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val isSnapshot = version.endsWith("-SNAPSHOT") || version.contains("-SNAPSHOT")
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val classifier =
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if (isSnapshot) {
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val prefix = "$name-$version-"
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filename.takeIf { it.startsWith(prefix) }?.removePrefix(prefix)?.removeSuffix(".$ext")
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} else {
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null
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}
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val isSnapshot = version.endsWith("-SNAPSHOT")
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val resolvedVersion =
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if (isSnapshot) {
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val resourcesFolder = File(cacheFolder.parentFile, "resources-2.1")
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findSnapshotValue(resourcesFolder, group, name, ext, classifier) ?: version
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resolveSnapshotVersion(snapshotBase, groupPath, name, version, ext) ?: version
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} else {
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version
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}
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val serverFilename =
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when {
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isSnapshot -> {
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val suffix = classifier?.let { "-$it" } ?: ""
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"$name-$resolvedVersion$suffix.$ext"
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}
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isSnapshot -> "$name-$resolvedVersion.$ext"
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filename.startsWith(standardPrefix) -> filename
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else -> "$name-$version.$ext"
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}
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@@ -128,31 +122,30 @@ abstract class GenerateFlatpakSourcesTask : DefaultTask() {
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val isJitpack = group.startsWith("com.github.")
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val primaryUrl =
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if (isSnapshot) {
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"https://central.sonatype.com/repository/maven-snapshots/$mavenPath"
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} else if (isJitpack) {
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"https://jitpack.io/$mavenPath"
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} else {
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"https://repo.maven.apache.org/maven2/$mavenPath"
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when {
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isSnapshot ->
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"$snapshotBase/$mavenPath"
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isJitpack ->
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"https://jitpack.io/$mavenPath"
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else ->
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"https://repo.maven.apache.org/maven2/$mavenPath"
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}
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val mirrorUrls =
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when {
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isSnapshot -> listOf("https://oss.sonatype.org/content/repositories/snapshots/$mavenPath")
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isSnapshot -> listOf(
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"https://s01.oss.sonatype.org/content/repositories/snapshots/$mavenPath",
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)
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isJitpack ->
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listOf(
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"https://repo.maven.apache.org/maven2/$mavenPath",
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"https://maven-central.storage-download.googleapis.com/maven2/$mavenPath",
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"https://maven.aliyun.com/repository/public/$mavenPath",
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)
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isJitpack -> emptyList()
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else ->
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listOf(
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"https://dl.google.com/dl/android/maven2/$mavenPath",
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"https://plugins.gradle.org/m2/$mavenPath",
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"https://maven-central.storage-download.googleapis.com/maven2/$mavenPath",
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"https://maven.aliyun.com/repository/public/$mavenPath",
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)
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}
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@@ -181,14 +174,17 @@ abstract class GenerateFlatpakSourcesTask : DefaultTask() {
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val finalEntries =
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deduplicated.map { candidate ->
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mapOf(
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val entry = mutableMapOf<String, Any>(
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"type" to "file",
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"url" to candidate.primaryUrl,
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"sha256" to calculateSha256(candidate.file),
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"dest" to candidate.dest,
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"dest-filename" to candidate.destFilename,
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"mirror-urls" to candidate.mirrorUrls,
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)
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if (candidate.mirrorUrls.isNotEmpty()) {
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entry["mirror-urls"] = candidate.mirrorUrls
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}
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entry
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}
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outputSourcesFile.writeText(JsonOutput.prettyPrint(JsonOutput.toJson(finalEntries)))
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@@ -197,6 +193,80 @@ abstract class GenerateFlatpakSourcesTask : DefaultTask() {
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)
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}
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/**
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* Resolves the timestamped snapshot version by fetching maven-metadata.xml from the remote
|
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* snapshot repository. Maven snapshot repos do not serve artifacts at the generic `-SNAPSHOT`
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* filename — they require the unique timestamped coordinate (e.g. `0.2.4-20260520.043744-2`).
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*/
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private fun resolveSnapshotVersion(
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snapshotBase: String,
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groupPath: String,
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artifactId: String,
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version: String,
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extension: String,
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): String? {
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val cacheKey = "$groupPath:$artifactId:$version"
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if (cacheKey in remoteMetadataCache) {
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return findMatchingVersion(remoteMetadataCache[cacheKey], extension)
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}
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val metadataUrl = "$snapshotBase/$groupPath/$artifactId/$version/maven-metadata.xml"
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val metadata = fetchAndParseMetadata(metadataUrl)
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remoteMetadataCache[cacheKey] = metadata
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return findMatchingVersion(metadata, extension)
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}
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private fun findMatchingVersion(metadata: SnapshotMetadata?, extension: String): String? {
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if (metadata == null) return null
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return metadata.snapshotVersions
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.firstOrNull { it.extension == extension && it.classifier == null }
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?.value
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?: metadata.fallbackValue
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}
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private fun fetchAndParseMetadata(url: String): SnapshotMetadata? {
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try {
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logger.info("Fetching snapshot metadata: $url")
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val connection = URI(url).toURL().openConnection()
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connection.connectTimeout = TIMEOUT_MS
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connection.readTimeout = TIMEOUT_MS
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val doc = connection.getInputStream().use { stream ->
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val dbFactory = DocumentBuilderFactory.newInstance()
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val dBuilder = dbFactory.newDocumentBuilder()
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dBuilder.parse(stream)
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}
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doc.documentElement.normalize()
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val root = doc.documentElement
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val snapshotVersions = mutableListOf<SnapshotVersion>()
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root.getElementsByTagName("snapshotVersion").forEachElement { element ->
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val ext = element.getChildText("extension") ?: return@forEachElement
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val value = element.getChildText("value") ?: return@forEachElement
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val classif = element.getChildText("classifier")
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snapshotVersions.add(SnapshotVersion(ext, classif, value))
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}
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var fallbackValue: String? = null
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val snapshotNode = root.getElementsByTagName("snapshot").item(0) as? Element
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if (snapshotNode != null) {
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val timestamp = snapshotNode.getChildText("timestamp")
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val buildNumber = snapshotNode.getChildText("buildNumber")
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val metaVersion = root.getChildText("version")
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if (timestamp != null && buildNumber != null && metaVersion != null) {
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||||
val baseVersion = metaVersion.substringBefore("-SNAPSHOT")
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||||
fallbackValue = "$baseVersion-$timestamp-$buildNumber"
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||||
}
|
||||
}
|
||||
|
||||
return SnapshotMetadata(snapshotVersions, fallbackValue)
|
||||
} catch (e: Exception) {
|
||||
logger.warn("Failed to fetch snapshot metadata from $url: ${e.message}")
|
||||
return null
|
||||
}
|
||||
}
|
||||
|
||||
private fun calculateSha256(file: File): String {
|
||||
val digest = MessageDigest.getInstance("SHA-256")
|
||||
file.inputStream().use { inputStream ->
|
||||
@@ -218,10 +288,8 @@ abstract class GenerateFlatpakSourcesTask : DefaultTask() {
|
||||
return String(hexChars)
|
||||
}
|
||||
|
||||
// Modern helper extension to query DOM child element text safely
|
||||
private fun Element.getChildText(tagName: String): String? = getElementsByTagName(tagName).item(0)?.textContent
|
||||
|
||||
// Modern helper extension to iterate DOM elements cleanly
|
||||
private fun NodeList.forEachElement(action: (Element) -> Unit) {
|
||||
for (i in 0 until length) {
|
||||
val node = item(i)
|
||||
@@ -231,74 +299,7 @@ abstract class GenerateFlatpakSourcesTask : DefaultTask() {
|
||||
}
|
||||
}
|
||||
|
||||
private fun populateMetadataCache(resourcesFolder: File) {
|
||||
if (metadataCache != null || !resourcesFolder.exists()) return
|
||||
val cache = mutableMapOf<String, SnapshotMetadata>()
|
||||
|
||||
resourcesFolder.walkTopDown().forEach { file ->
|
||||
if (file.isFile && file.name == "maven-metadata.xml") {
|
||||
try {
|
||||
val dbFactory = DocumentBuilderFactory.newInstance()
|
||||
val dBuilder = dbFactory.newDocumentBuilder()
|
||||
val doc = dBuilder.parse(file)
|
||||
doc.documentElement.normalize()
|
||||
|
||||
val root = doc.documentElement
|
||||
val group = root.getChildText("groupId") ?: return@forEach
|
||||
val name = root.getChildText("artifactId") ?: return@forEach
|
||||
|
||||
val key = "$group:$name"
|
||||
val snapshotVersions = mutableListOf<SnapshotVersion>()
|
||||
root.getElementsByTagName("snapshotVersion").forEachElement { element ->
|
||||
val ext = element.getChildText("extension") ?: return@forEachElement
|
||||
val value = element.getChildText("value") ?: return@forEachElement
|
||||
val classif = element.getChildText("classifier")
|
||||
|
||||
snapshotVersions.add(SnapshotVersion(ext, classif, value))
|
||||
}
|
||||
|
||||
var fallbackValue: String? = null
|
||||
val snapshotNode = root.getElementsByTagName("snapshot").item(0) as? Element
|
||||
if (snapshotNode != null) {
|
||||
val timestamp = snapshotNode.getChildText("timestamp")
|
||||
val buildNumber = snapshotNode.getChildText("buildNumber")
|
||||
val version = root.getChildText("version")
|
||||
if (timestamp != null && buildNumber != null && version != null) {
|
||||
val baseVersion = version.substringBefore("-SNAPSHOT")
|
||||
fallbackValue = "$baseVersion-$timestamp-$buildNumber"
|
||||
}
|
||||
}
|
||||
|
||||
cache[key] = SnapshotMetadata(snapshotVersions, fallbackValue)
|
||||
} catch (e: Exception) {
|
||||
// Ignore parsing errors for individual files
|
||||
}
|
||||
}
|
||||
}
|
||||
metadataCache = cache
|
||||
}
|
||||
|
||||
private fun findSnapshotValue(
|
||||
resourcesFolder: File,
|
||||
group: String,
|
||||
name: String,
|
||||
extension: String,
|
||||
classifier: String?,
|
||||
): String? {
|
||||
populateMetadataCache(resourcesFolder)
|
||||
val metadata = metadataCache?.get("$group:$name") ?: return null
|
||||
|
||||
for (version in metadata.snapshotVersions) {
|
||||
if (version.extension == extension) {
|
||||
if (classifier == null && version.classifier == null) {
|
||||
return version.value
|
||||
}
|
||||
if (classifier != null && classifier == version.classifier) {
|
||||
return version.value
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return metadata.fallbackValue
|
||||
private companion object {
|
||||
private const val TIMEOUT_MS = 10_000
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user