Added the download_artifact module
The download_artifact module resolves a maven dependency coordinate and downloads the artifact to the target path
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Chris Schmidt
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1 changed files with 367 additions and 0 deletions
367
packaging/download_artifact.py
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367
packaging/download_artifact.py
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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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# Copyright (c) 2014, Chris Schmidt <chris.schmidt () contrastsecurity.com>
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#
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# Built using https://github.com/hamnis/useful-scripts/blob/master/python/download-maven-artifact
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# as a reference and starting point.
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#
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#
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__author__ = 'cschmidt'
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from lxml import etree
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from urllib2 import Request, urlopen, URLError, HTTPError
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import os
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import hashlib
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import sys
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import base64
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DOCUMENTATION = '''
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---
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module: download_artifact
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short_description: Downloads an Artifact from a Maven Repository
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version_added: "historical"
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description:
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- Downloads an artifact from a maven repository given the maven coordinates provided to the module. Can retrieve
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- snapshots or release versions of the artifact and will resolve the latest available version if one is not
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- available.
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author: Chris Schmidt <chris.schmidt () contrastsecurity.com>
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requirements:
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- python libxml
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- python urllib2
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options:
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group_id:
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description: The Maven groupId coordinate
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required: true
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default: null
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version_added: 0.0.1
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artifact_id:
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description: The maven artifactId coordinate
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required: true
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default: null
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version_added: 0.0.1
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version:
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description: The maven version coordinate
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required: false
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default: latest
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version_added: 0.0.1
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classifier:
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description: The maven classifier coordinate
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required: false
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default: null
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version_added: 0.0.1
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extension:
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description: The maven type/extension coordinate
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required: false
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default: jar
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version_added: 0.0.1
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repository_url:
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description: The URL of the Maven Repository to download from
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required: false
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default: http://repo1.maven.org/maven2
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version_added: 0.0.1
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username:
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description: The username to authenticate as to the Maven Repository
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required: false
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default: null
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version_added: 0.0.1
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password:
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description: The passwor to authenticate with to the Maven Repository
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required: false
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default: null
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version_added: 0.0.1
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target:
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description: The path where the artifact should be written to
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required: true
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default: false
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version_added: 0.0.1
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state:
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description: The desired state of the artifact
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required: true
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default: present
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choices: [present,absent]
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version_added: 0.0.1
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'''
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EXAMPLES = '''
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# Download the latest version of the commons-collections artifact from Maven Central
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- download_artifact: group_id=org.apache.commons artifact_id=commons-collections target=/tmp/commons-collections-latest.jar
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# Download Apache Commons-Collections 3.2 from Maven Central
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- download_artifact: group_id=org.apache.commons artifact_id=commons-collections version=3.2 target=/tmp/commons-collections-3.2.jar
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# Download an artifact from a private repository requiring authentication
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- download_artifact: group_id=com.company artifact_id=library-name repository_url=https://repo.company.com/maven username=user password=pass target=/tmp/library-name-latest.jar
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# Download a WAR File to the Tomcat webapps directory to be deployed
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- download_artifact: group_id=com.company artifact_id=web-app extension=war repository_url=https://repo.company.com/maven target=/var/lib/tomcat7/webapps/web-app.war
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'''
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class Artifact(object):
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def __init__(self, group_id, artifact_id, version, classifier=None, extension=jar):
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if not group_id:
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raise ValueError("group_id must be set")
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if not artifact_id:
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raise ValueError("artifact_id must be set")
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self.group_id = group_id
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self.artifact_id = artifact_id
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self.version = version
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self.classifier = classifier
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if not extension:
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self.extension = "jar"
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else:
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self.extension = extension
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def is_snapshot(self):
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return self.version and self.version.endswith("SNAPSHOT")
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def path(self, with_version=True):
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base = self.group_id.replace(".", "/") + "/" + self.artifact_id
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if with_version and self.version:
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return base + "/" + self.version
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else:
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return base
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def _generate_filename(self):
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if not self.classifier:
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return self.artifact_id + "." + self.extension
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else:
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return self.artifact_id + "-" + self.classifier + "." + self.extension
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def get_filename(self, filename=None):
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if not filename:
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filename = self._generate_filename()
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elif os.path.isdir(filename):
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filename = os.path.join(filename, self._generate_filename())
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return filename
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def __str__(self):
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if self.classifier:
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return "%s:%s:%s:%s:%s" % (self.group_id, self.artifact_id, self.extension, self.classifier, self.version)
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elif self.extension != "jar":
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return "%s:%s:%s:%s" % (self.group_id, self.artifact_id, self.extension, self.version)
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else:
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return "%s:%s:%s" % (self.group_id, self.artifact_id, self.version)
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@staticmethod
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def parse(input):
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parts = input.split(":")
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if len(parts) >= 3:
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g = parts[0]
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a = parts[1]
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v = parts[len(parts) - 1]
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t = None
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c = None
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if len(parts) == 4:
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t = parts[2]
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if len(parts) == 5:
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t = parts[2]
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c = parts[3]
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return Artifact(g, a, v, c, t)
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else:
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return None
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class MavenDownloader:
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def __init__(self, base="http://repo1.maven.org/maven2", username=None, password=None):
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if base.endswith("/"):
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base = base.rstrip("/")
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self.base = base
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self.user_agent = "Maven Artifact Downloader/1.0"
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self.username = username
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self.password = password
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def _find_latest_version_available(self, artifact):
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path = "/%s/maven-metadata.xml" % (artifact.path(False))
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xml = self._request(self.base + path, "Failed to download maven-metadata.xml", lambda r: etree.parse(r))
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v = xml.xpath("/metadata/versioning/versions/version[last()]/text()")
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if v:
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return v[0]
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def find_uri_for_artifact(self, artifact):
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if artifact.is_snapshot():
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path = "/%s/maven-metadata.xml" % (artifact.path())
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xml = self._request(self.base + path, "Failed to download maven-metadata.xml", lambda r: etree.parse(r))
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basexpath = "/metadata/versioning/"
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p = xml.xpath(basexpath + "/snapshotVersions/snapshotVersion")
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if p:
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return self._find_matching_artifact(p, artifact)
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else:
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return self._uri_for_artifact(artifact)
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def _find_matching_artifact(self, elems, artifact):
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filtered = filter(lambda e: e.xpath("extension/text() = '%s'" % artifact.extension), elems)
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if artifact.classifier:
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filtered = filter(lambda e: e.xpath("classifier/text() = '%s'" % artifact.classifier), elems)
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if len(filtered) > 1:
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print(
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"There was more than one match. Selecting the first one. Try adding a classifier to get a better match.")
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elif not len(filtered):
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print("There were no matches.")
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return None
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elem = filtered[0]
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value = elem.xpath("value/text()")
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return self._uri_for_artifact(artifact, value[0])
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def _uri_for_artifact(self, artifact, version=None):
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if artifact.is_snapshot() and not version:
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raise ValueError("Expected uniqueversion for snapshot artifact " + str(artifact))
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elif not artifact.is_snapshot():
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version = artifact.version
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if artifact.classifier:
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return self.base + "/" + artifact.path() + "/" + artifact.artifact_id + "-" + version + "-" + artifact.classifier + "." + artifact.extension
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return self.base + "/" + artifact.path() + "/" + artifact.artifact_id + "-" + version + "." + artifact.extension
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def _request(self, url, failmsg, f):
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if not self.username:
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headers = {"User-Agent": self.user_agent}
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else:
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headers = {
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"User-Agent": self.user_agent,
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"Authorization": "Basic " + base64.b64encode(self.username + ":" + self.password)
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}
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req = Request(url, None, headers)
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try:
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response = urlopen(req)
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except HTTPError, e:
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raise ValueError(failmsg + " because of " + str(e) + "for URL " + url)
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except URLError, e:
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raise ValueError(failmsg + " because of " + str(e) + "for URL " + url)
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else:
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return f(response)
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def download(self, artifact, filename=None):
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filename = artifact.get_filename(filename)
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if not artifact.version:
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artifact = Artifact(artifact.group_id, artifact.artifact_id, self._find_latest_version_available(artifact),
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artifact.classifier, artifact.extension)
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url = self.find_uri_for_artifact(artifact)
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if not self.verify_md5(filename, url + ".md5"):
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response = self._request(url, "Failed to download artifact " + str(artifact), lambda r: r)
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if response:
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with open(filename, 'w') as f:
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# f.write(response.read())
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self._write_chunks(response, f, report_hook=self.chunk_report)
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return True
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else:
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return False
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else:
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return True
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def chunk_report(self, bytes_so_far, chunk_size, total_size):
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percent = float(bytes_so_far) / total_size
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percent = round(percent * 100, 2)
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sys.stdout.write("Downloaded %d of %d bytes (%0.2f%%)\r" %
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(bytes_so_far, total_size, percent))
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if bytes_so_far >= total_size:
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sys.stdout.write('\n')
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def _write_chunks(self, response, file, chunk_size=8192, report_hook=None):
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total_size = response.info().getheader('Content-Length').strip()
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total_size = int(total_size)
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bytes_so_far = 0
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while 1:
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chunk = response.read(chunk_size)
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bytes_so_far += len(chunk)
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if not chunk:
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break
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file.write(chunk)
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if report_hook:
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report_hook(bytes_so_far, chunk_size, total_size)
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return bytes_so_far
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def verify_md5(self, file, remote_md5):
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if not os.path.exists(file):
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return False
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else:
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local_md5 = self._local_md5(file)
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remote = self._request(remote_md5, "Failed to download MD5", lambda r: r.read())
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return local_md5 == remote
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def _local_md5(self, file):
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md5 = hashlib.md5()
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with open(file, 'rb') as f:
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for chunk in iter(lambda: f.read(8192), ''):
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md5.update(chunk)
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return md5.hexdigest()
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def main():
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module = AnsibleModule(
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argument_spec = dict(
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group_id = dict(default=None),
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artifact_id = dict(default=None),
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version = dict(default=None),
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classifier = dict(default=None),
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extension = dict(default=None),
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repository_url = dict(default=None),
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username = dict(default=None),
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password = dict(default=None),
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state = dict(default="latest", choices=["present","absent"]),
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target = dict(default=None),
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)
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)
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group_id = module.params["group_id"]
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artifact_id = module.params["artifact_id"]
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version = module.params["version"]
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classifier = module.params["classifier"]
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extension = module.params["extension"]
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repository_url = module.params["repository_url"]
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repository_username = module.params["username"]
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repository_password = module.params["password"]
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state = module.params["state"]
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target = module.params["target"]
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if not repository_url:
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repository_url = "http://repo1.maven.org/maven2"
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downloader = MavenDownloader(repository_url, repository_username, repository_password)
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try:
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artifact = Artifact(group_id, artifact_id, version, classifier, extension)
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except ValueError as e:
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module.fail_json(msg=e.args[0])
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prev_state = "absent"
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if os.path.lexists(target):
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prev_state = "present"
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else:
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path = os.path.dirname(target)
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if not os.path.exists(path):
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os.makedirs(path)
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if prev_state == "present":
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if state == "latest":
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artifact_uri = downloader.find_uri_for_artifact(artifact)
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if downloader.verify_md5(target, artifact_uri + ".md5"):
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module.exit_json(target=target, state=state, changed=False)
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else:
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module.exit_json(target=target, state=state, changed=False)
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try:
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if downloader.download(artifact, target):
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module.exit_json(state=state, target=target, group_id=group_id, artifact_id=artifact_id, version=version, classifier=classifier, extension=extension, repository_url=repository_url, changed=True)
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else:
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module.fail_json(msg="Unable to download the artifact")
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except ValueError as e:
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module.fail_json(msg=e.args[0])
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# import module snippets
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from ansible.module_utils.basic import *
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from ansible.module_utils.urls import *
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main()
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