Add maven generator script

maven/flatpak-maven-generator.py

@@ -0,0 +1,226 @@
+#!/usr/bin/env python3
+
+__license__ = 'MIT'
+
+import argparse
+import hashlib
+import json
+import logging
+import shutil
+import sys
+import tempfile
+from typing import List, Dict, Optional
+import urllib.request
+import xml.etree.ElementTree as ET
+
+parser = argparse.ArgumentParser()
+parser.add_argument('packages', nargs='*')
+parser.add_argument('--output', '-o',
+                    help='Specify output file name', default="maven-sources.json")
+parser.add_argument('--repo', '-r', action="append")
+parser.add_argument('--verbose', '-v', action='store_true')
+
+def assembleUri(repo: str, groupId: str, artifactId: str, version: str, extension: str) -> str:
+    groupId = groupId.replace(".", "/")
+    return f'{repo}{groupId}/{artifactId}/{version}/{artifactId}-{version}.{extension}'
+
+def getFileHash(file) -> str:
+    file.seek(0)
+    byteData = file.read() # read entire file as bytes
+    return hashlib.sha256(byteData).hexdigest()
+
+def parsePomDeps(parsed_pom) -> List[Dict[str, str]]:
+    ns = {'POM': 'http://maven.apache.org/POM/4.0.0'}
+
+    result = []
+
+    parent = parsed_pom.find("POM:parent", ns)
+    if parent is not None:
+        groupId = parent.find("POM:groupId", ns).text
+        artifactId = parent.find("POM:artifactId", ns).text
+        version = parent.find("POM:version", ns).text
+
+        result.append({
+            "groupId": groupId,
+            "artifactId": artifactId,
+            "version": version
+        })
+
+    deps = parsed_pom.findall("POM:dependencies/POM:dependency", ns)
+    for dep in deps:
+        groupId = dep.find("POM:groupId", ns).text
+        artifactId = dep.find("POM:artifactId", ns).text
+        version = dep.find("POM:version", ns)
+
+        if(version is None):
+            continue
+
+        version = version.text
+
+        result.append({
+            "groupId": groupId,
+            "artifactId": artifactId,
+            "version": version
+        })
+
+    return result
+
+def getPackagingType(parsed_pom) -> Optional[str]:
+    ns = {'POM': 'http://maven.apache.org/POM/4.0.0'}
+
+    packaging = parsed_pom.find("POM:packaging", ns)
+    if packaging is not None and packaging.text == "pom":
+        return None # Nothing to download for this
+
+    if packaging is None:
+        # jar is default if nothing is specified
+        return "jar"
+
+    return packaging.text
+
+modules = []
+addedModules = []
+
+def addModule(groupId: str, artifactId: str, version: str):
+    addedModules.append({
+        "groupId": groupId,
+        "artifactId": artifactId,
+        "version": version
+    })
+
+def downloadAndAdd(repo: str, groupId: str, artifactId: str, version: str, binaryType: str) -> bool:
+    url = assembleUri(repo, groupId, artifactId, version, binaryType)
+    groupId = groupId.replace(".", "/")
+    try:
+        with urllib.request.urlopen(url) as response:
+            with tempfile.NamedTemporaryFile(delete=True) as tmp_file:
+                shutil.copyfileobj(response, tmp_file)
+
+                modules.append({
+                   "type": "file",
+                   "url": url,
+                   "sha256": getFileHash(tmp_file),
+                   "dest": f"maven-local/{groupId}/{artifactId}/{version}"
+                })
+
+                return True
+    except urllib.error.HTTPError:
+        logging.warning("Unable to download %s file for %s", binaryType, artifactId)
+        return False
+
+def parseGradleMetadata(repo: str, groupId: str, artifactId: str, version: str) -> bool:
+    url = assembleUri(repo, groupId, artifactId, version, "module")
+    groupId = groupId.replace(".", "/")
+    try:
+        with urllib.request.urlopen(url) as response:
+            with tempfile.NamedTemporaryFile(delete=True) as tmp_file:
+                shutil.copyfileobj(response, tmp_file)
+
+                tmp_file.seek(0)
+                gradle_meta = json.loads(tmp_file.read().decode('utf-8'))
+                for variant in gradle_meta["variants"]:
+                    if "files" not in variant:
+                        continue
+                    for file in variant["files"]:
+                        modules.append({
+                           "type": "file",
+                           "url": f'{repo}{groupId}/{artifactId}/{version}/{file["url"]}',
+                           "sha256": file["sha256"],
+                           "dest": f'maven-local/{groupId}/{artifactId}/{version}'
+                        })
+
+                modules.append({
+                   "type": "file",
+                   "url": url,
+                   "sha256": getFileHash(tmp_file),
+                   "dest": f"maven-local/{groupId}/{artifactId}/{version}"
+                })
+
+                return True
+    except urllib.error.HTTPError:
+        logging.warning("Unable to get the extended Gradle module metadata for %s", artifactId)
+        return False
+
+def parsePomTree(repos: list[str], groupId: str, artifactId: str, version: str) -> bool:
+    for module in addedModules:
+        if module["groupId"] == groupId and module["artifactId"] == artifactId and module["version"] == version:
+            return True
+
+    for repo in repos:
+        url = assembleUri(repo, groupId, artifactId, version, "pom")
+
+        try:
+            logging.debug("Looking for %s:%s at %s", artifactId, version, url)
+            with urllib.request.urlopen(url) as response:
+                with tempfile.NamedTemporaryFile(delete=True) as tmp_file:
+                    addModule(groupId, artifactId, version)
+
+                    shutil.copyfileobj(response, tmp_file)
+                    tmp_file.seek(0)
+                    file_content = tmp_file.read().decode('utf-8')
+                    parsed_file = ET.fromstring(file_content)
+
+                    if (binaryType := getPackagingType(parsed_file)) is not None:
+                        downloadAndAdd(repo, groupId, artifactId, version, binaryType)
+
+                    if("do_not_remove: published-with-gradle-metadata" in file_content):
+                        # This module has extended Gradle metadata, download that (and its dependencies)
+                        parseGradleMetadata(repo, groupId, artifactId, version)
+
+                    deps = parsePomDeps(parsed_file)
+                    for dep in deps:
+                        parsePomTree(repos, dep["groupId"], dep["artifactId"], dep["version"])
+
+                    groupId = groupId.replace(".", "/")
+                    modules.append({
+                        "type": "file",
+                        "url": url,
+                        "sha256": getFileHash(tmp_file),
+                        "dest": f"maven-local/{groupId}/{artifactId}/{version}"
+                    })
+
+                    return True
+
+        except urllib.error.HTTPError:
+            pass
+
+    logging.warning("%s:%s not found in any source", artifactId, version)
+    return False
+
+def main():
+    opts = parser.parse_args()
+
+    repos = []
+    if(opts.repo is not None):
+        repos.extend(opts.repo)
+    else:
+        repos.append("https://repo.maven.apache.org/maven2/")
+
+    if len(opts.packages) < 1:
+        parser.print_help()
+        sys.exit(1)
+
+    if opts.verbose:
+        loglevel = logging.DEBUG
+    else:
+        loglevel = logging.INFO
+    logging.basicConfig(level=loglevel)
+
+    for package in opts.packages:
+        package_parts = package.split(":")
+        if len(package_parts) != 3:
+            print("Package names must be in the format groupId:artifactId:version")
+            sys.exit(1)
+
+        groupId = package_parts[0]
+        artifactId = package_parts[1]
+        version = package_parts[2]
+
+        parsePomTree(repos, groupId, artifactId, version)
+
+    with open(opts.output, 'w') as output:
+        output.write(json.dumps(modules, indent=4))
+        logging.info('Output saved to %s', opts.output)
+
+if __name__ == "__main__":
+    main()

maven/readme.md

@@ -0,0 +1,45 @@
+# Flatpak Maven Generator
+
+Tool to automatically generate `flatpak-builder` manifest json from maven artifact names.
+
+## Usage
+
+`flatpak-maven-generator groupId:artifactId:version` which generates `maven-sources.json` and can be included in a manifest like:
+
+```json
+"sources": [
+  "maven-sources.json"
+]
+```
+
+You can also list multiple space separated artifacts in single command, for example:
+```
+flatpak-maven-generator org.foo.bar:artifact1:1.0.0 org.foo.baz:artifact2:1.5.21
+```
+
+By default, artifacts are looked up on [Maven Central](https://search.maven.org/), but different or additional repositories can be specified with the `-r`/`--repo` flag. For example:
+```
+flatpak-maven-generator --repo https://plugins.gradle.org/m2/ --repo https://repo.maven.apache.org/maven2/ org.foo.bar:artifact1:1.0.0
+```
+
+Repositories will be searched in the order they are specified on the command line.
+
+When included in a manifest, the JSON file will instruct `flatpak-builder` to download the necessary files to mirror the requested artifacts (and their recursive dependencies) into a local maven repository. This is created in a folder called `maven-local`, so the build configuration of the software being built will have to be modified to search for its dependencies there. For example, in a `build.gradle.kts` file, you would add the following:
+```
+allprojects {
+	repositories {
+		maven(url = "./maven-local")
+	}
+}
+```
+
+If you are intending to mirror Gradle plugins inside your Flatpak build sandbox, you may additionally have to specify the following in `settings.gradle.kts` (or equivalent):
+```
+pluginManagement {
+    repositories {
+        maven(url = "./maven-local")
+    }
+}
+```
+
+If you are building multiple modules that all depend on the local maven mirror, you may wish to move the mirrored `maven-local` folder to `$FLATPAK_DEST`, where it can be shared between modules and then cleaned up afterwards.