Coverage Report

Coverage Report - org.owasp.dependencycheck.analyzer.PythonDistributionAnalyzer

Classes in this File

Line Coverage

Branch Coverage

Complexity

PythonDistributionAnalyzer

81%

90/110

65%

30/46

3.462

 /*
  * This file is part of dependency-check-core.
  *
  * 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.
  *
  * Copyright (c) 2015 Institute for Defense Analyses. All Rights Reserved.
  */
 package org.owasp.dependencycheck.analyzer;
 
 import java.io.BufferedInputStream;
 import java.io.File;
 import java.io.FileFilter;
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
 import java.io.FilenameFilter;
 import java.io.IOException;
 import org.apache.commons.io.filefilter.NameFileFilter;
 import org.apache.commons.io.filefilter.SuffixFileFilter;
 import org.apache.commons.io.input.AutoCloseInputStream;
 import org.apache.commons.lang3.StringUtils;
 import org.owasp.dependencycheck.Engine;
 import org.owasp.dependencycheck.analyzer.exception.AnalysisException;
 import org.owasp.dependencycheck.dependency.Confidence;
 import org.owasp.dependencycheck.dependency.Dependency;
 import org.owasp.dependencycheck.dependency.EvidenceCollection;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import javax.mail.MessagingException;
 import javax.mail.internet.InternetHeaders;
 import org.owasp.dependencycheck.exception.InitializationException;
 import org.owasp.dependencycheck.utils.ExtractionException;
 import org.owasp.dependencycheck.utils.ExtractionUtil;
 import org.owasp.dependencycheck.utils.FileFilterBuilder;
 import org.owasp.dependencycheck.utils.FileUtils;
 import org.owasp.dependencycheck.utils.Settings;
 import org.owasp.dependencycheck.utils.UrlStringUtils;
 
 /**
  * Used to analyze a Wheel or egg distribution files, or their contents in
  * unzipped form, and collect information that can be used to determine the
  * associated CPE.
  *
  * @author Dale Visser
  */
 @Experimental
 public class PythonDistributionAnalyzer extends AbstractFileTypeAnalyzer {
 
     /**
      * Name of egg metadata files to analyze.
      */
     private static final String PKG_INFO = "PKG-INFO";
 
     /**
      * Name of wheel metadata files to analyze.
      */
     private static final String METADATA = "METADATA";
 
     /**
      * The logger.
      */
     private static final Logger LOGGER = LoggerFactory
             .getLogger(PythonDistributionAnalyzer.class);
 
     /**
      * The count of directories created during analysis. This is used for
      * creating temporary directories.
      */
     private static int dirCount = 0;
 
     /**
      * The name of the analyzer.
      */
     private static final String ANALYZER_NAME = "Python Distribution Analyzer";
     /**
      * The phase that this analyzer is intended to run in.
      */
     private static final AnalysisPhase ANALYSIS_PHASE = AnalysisPhase.INFORMATION_COLLECTION;
 
     /**
      * The set of file extensions supported by this analyzer.
      */
     private static final String[] EXTENSIONS = {"whl", "egg", "zip"};
 
     /**
      * Used to match on egg archive candidate extensions.
      */
     private static final FileFilter EGG_OR_ZIP = FileFilterBuilder.newInstance().addExtensions("egg", "zip").build();
 
     /**
      * Used to detect files with a .whl extension.
      */
     private static final FileFilter WHL_FILTER = FileFilterBuilder.newInstance().addExtensions("whl").build();
 
     /**
      * The parent directory for the individual directories per archive.
      */
     private File tempFileLocation;
 
     /**
      * Filter that detects *.dist-info files (but doesn't verify they are
      * directories.
      */
     private static final FilenameFilter DIST_INFO_FILTER = new SuffixFileFilter(
             ".dist-info");
 
     /**
      * Filter that detects files named "METADATA".
      */
     private static final FilenameFilter EGG_INFO_FILTER = new NameFileFilter(
             "EGG-INFO");
 
     /**
      * Filter that detects files named "METADATA".
      */
     private static final NameFileFilter METADATA_FILTER = new NameFileFilter(
             METADATA);
 
     /**
      * Filter that detects files named "PKG-INFO".
      */
     private static final NameFileFilter PKG_INFO_FILTER = new NameFileFilter(
             PKG_INFO);
 
     /**
      * The file filter used to determine which files this analyzer supports.
      */
     private static final FileFilter FILTER = FileFilterBuilder.newInstance().addFileFilters(
             METADATA_FILTER, PKG_INFO_FILTER).addExtensions(EXTENSIONS).build();
 
     /**
      * Returns the FileFilter
      *
      * @return the FileFilter
      */
     @Override
     protected FileFilter getFileFilter() {
         return FILTER;
     }
 
     /**
      * Returns the name of the analyzer.
      *
      * @return the name of the analyzer.
      */
     @Override
     public String getName() {
         return ANALYZER_NAME;
     }
 
     /**
      * Returns the phase that the analyzer is intended to run in.
      *
      * @return the phase that the analyzer is intended to run in.
      */
     @Override
     public AnalysisPhase getAnalysisPhase() {
         return ANALYSIS_PHASE;
     }
 
     /**
      * Returns the key used in the properties file to reference the analyzer's
      * enabled property.
      *
      * @return the analyzer's enabled property setting key
      */
     @Override
     protected String getAnalyzerEnabledSettingKey() {
         return Settings.KEYS.ANALYZER_PYTHON_DISTRIBUTION_ENABLED;
     }
 
     @Override
     protected void analyzeFileType(Dependency dependency, Engine engine)
             throws AnalysisException {
         final File actualFile = dependency.getActualFile();
         if (WHL_FILTER.accept(actualFile)) {
             collectMetadataFromArchiveFormat(dependency, DIST_INFO_FILTER,
                     METADATA_FILTER);
         } else if (EGG_OR_ZIP.accept(actualFile)) {
             collectMetadataFromArchiveFormat(dependency, EGG_INFO_FILTER,
                     PKG_INFO_FILTER);
         } else {
             final String name = actualFile.getName();
             final boolean metadata = METADATA.equals(name);
             if (metadata || PKG_INFO.equals(name)) {
                 final File parent = actualFile.getParentFile();
                 final String parentName = parent.getName();
                 dependency.setDisplayFileName(parentName + "/" + name);
                 if (parent.isDirectory()
                         && (metadata && parentName.endsWith(".dist-info")
                         || parentName.endsWith(".egg-info") || "EGG-INFO"
                         .equals(parentName))) {
                     collectWheelMetadata(dependency, actualFile);
                 }
             }
         }
     }
 
     /**
      * Collects the meta data from an archive.
      *
      * @param dependency the archive being scanned
      * @param folderFilter the filter to apply to the folder
      * @param metadataFilter the filter to apply to the meta data
      * @throws AnalysisException thrown when there is a problem analyzing the
      * dependency
      */
     private void collectMetadataFromArchiveFormat(Dependency dependency,
             FilenameFilter folderFilter, FilenameFilter metadataFilter)
             throws AnalysisException {
         final File temp = getNextTempDirectory();
         LOGGER.debug("{} exists? {}", temp, temp.exists());
         try {
             ExtractionUtil.extractFilesUsingFilter(
                     new File(dependency.getActualFilePath()), temp,
                     metadataFilter);
         } catch (ExtractionException ex) {
             throw new AnalysisException(ex);
         }
 
         collectWheelMetadata(
                 dependency,
                 getMatchingFile(getMatchingFile(temp, folderFilter),
                         metadataFilter));
     }
 
     /**
      * Makes sure a usable temporary directory is available.
      *
      * @throws InitializationException an AnalyzeException is thrown when the
      * temp directory cannot be created
      */
     @Override
     protected void initializeFileTypeAnalyzer() throws InitializationException {
         try {
             final File baseDir = Settings.getTempDirectory();
             tempFileLocation = File.createTempFile("check", "tmp", baseDir);
             if (!tempFileLocation.delete()) {
                 setEnabled(false);
                 final String msg = String.format(
                         "Unable to delete temporary file '%s'.",
                         tempFileLocation.getAbsolutePath());
                 throw new InitializationException(msg);
             }
             if (!tempFileLocation.mkdirs()) {
                 setEnabled(false);
                 final String msg = String.format(
                         "Unable to create directory '%s'.",
                         tempFileLocation.getAbsolutePath());
                 throw new InitializationException(msg);
             }
         } catch (IOException ex) {
             setEnabled(false);
             throw new InitializationException("Unable to create a temporary file", ex);
         }
     }
 
     /**
      * Deletes any files extracted from the Wheel during analysis.
      */
     @Override
     public void close() {
         if (tempFileLocation != null && tempFileLocation.exists()) {
             LOGGER.debug("Attempting to delete temporary files");
             final boolean success = FileUtils.delete(tempFileLocation);
             if (!success) {
                 LOGGER.warn(
                         "Failed to delete some temporary files, see the log for more details");
             }
         }
     }
 
     /**
      * Gathers evidence from the METADATA file.
      *
      * @param dependency the dependency being analyzed
      * @param file a reference to the manifest/properties file
      */
     private static void collectWheelMetadata(Dependency dependency, File file) {
         final InternetHeaders headers = getManifestProperties(file);
         addPropertyToEvidence(headers, dependency.getVersionEvidence(),
                 "Version", Confidence.HIGHEST);
         addPropertyToEvidence(headers, dependency.getProductEvidence(), "Name",
                 Confidence.HIGHEST);
         final String url = headers.getHeader("Home-page", null);
         final EvidenceCollection vendorEvidence = dependency
                 .getVendorEvidence();
         if (StringUtils.isNotBlank(url)) {
             if (UrlStringUtils.isUrl(url)) {
                 vendorEvidence.addEvidence(METADATA, "vendor", url,
                         Confidence.MEDIUM);
             }
         }
         addPropertyToEvidence(headers, vendorEvidence, "Author", Confidence.LOW);
         final String summary = headers.getHeader("Summary", null);
         if (StringUtils.isNotBlank(summary)) {
             JarAnalyzer
                     .addDescription(dependency, summary, METADATA, "summary");
         }
     }
 
     /**
      * Adds a value to the evidence collection.
      *
      * @param headers the properties collection
      * @param evidence the evidence collection to add the value
      * @param property the property name
      * @param confidence the confidence of the evidence
      */
     private static void addPropertyToEvidence(InternetHeaders headers,
             EvidenceCollection evidence, String property, Confidence confidence) {
         final String value = headers.getHeader(property, null);
         LOGGER.debug("Property: {}, Value: {}", property, value);
         if (StringUtils.isNotBlank(value)) {
             evidence.addEvidence(METADATA, property, value, confidence);
         }
     }
 
     /**
      * Returns a list of files that match the given filter, this does not
      * recursively scan the directory.
      *
      * @param folder the folder to filter
      * @param filter the filter to apply to the files in the directory
      * @return the list of Files in the directory that match the provided filter
      */
     private static File getMatchingFile(File folder, FilenameFilter filter) {
         File result = null;
         final File[] matches = folder.listFiles(filter);
         if (null != matches && 1 == matches.length) {
             result = matches[0];
         }
         return result;
     }
 
     /**
      * Reads the manifest entries from the provided file.
      *
      * @param manifest the manifest
      * @return the manifest entries
      */
     private static InternetHeaders getManifestProperties(File manifest) {
         final InternetHeaders result = new InternetHeaders();
         if (null == manifest) {
             LOGGER.debug("Manifest file not found.");
         } else {
             try {
                 result.load(new AutoCloseInputStream(new BufferedInputStream(
                         new FileInputStream(manifest))));
             } catch (MessagingException e) {
                 LOGGER.warn(e.getMessage(), e);
             } catch (FileNotFoundException e) {
                 LOGGER.warn(e.getMessage(), e);
             }
         }
         return result;
     }
 
     /**
      * Retrieves the next temporary destination directory for extracting an
      * archive.
      *
      * @return a directory
      * @throws AnalysisException thrown if unable to create temporary directory
      */
     private File getNextTempDirectory() throws AnalysisException {
         File directory;
 
         // getting an exception for some directories not being able to be
         // created; might be because the directory already exists?
         do {
             dirCount += 1;
             directory = new File(tempFileLocation, String.valueOf(dirCount));
         } while (directory.exists());
         if (!directory.mkdirs()) {
             throw new AnalysisException(String.format(
                     "Unable to create temp directory '%s'.",
                     directory.getAbsolutePath()));
         }
         return directory;
     }
 }

1		/*
2		* This file is part of dependency-check-core.
3		*
4		* Licensed under the Apache License, Version 2.0 (the "License");
5		* you may not use this file except in compliance with the License.
6		* You may obtain a copy of the License at
7		*
8		* http://www.apache.org/licenses/LICENSE-2.0
9		*
10		* Unless required by applicable law or agreed to in writing, software
11		* distributed under the License is distributed on an "AS IS" BASIS,
12		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13		* See the License for the specific language governing permissions and
14		* limitations under the License.
15		*
16		* Copyright (c) 2015 Institute for Defense Analyses. All Rights Reserved.
17		*/
18		package org.owasp.dependencycheck.analyzer;
19
20		import java.io.BufferedInputStream;
21		import java.io.File;
22		import java.io.FileFilter;
23		import java.io.FileInputStream;
24		import java.io.FileNotFoundException;
25		import java.io.FilenameFilter;
26		import java.io.IOException;
27		import org.apache.commons.io.filefilter.NameFileFilter;
28		import org.apache.commons.io.filefilter.SuffixFileFilter;
29		import org.apache.commons.io.input.AutoCloseInputStream;
30		import org.apache.commons.lang3.StringUtils;
31		import org.owasp.dependencycheck.Engine;
32		import org.owasp.dependencycheck.analyzer.exception.AnalysisException;
33		import org.owasp.dependencycheck.dependency.Confidence;
34		import org.owasp.dependencycheck.dependency.Dependency;
35		import org.owasp.dependencycheck.dependency.EvidenceCollection;
36		import org.slf4j.Logger;
37		import org.slf4j.LoggerFactory;
38
39		import javax.mail.MessagingException;
40		import javax.mail.internet.InternetHeaders;
41		import org.owasp.dependencycheck.exception.InitializationException;
42		import org.owasp.dependencycheck.utils.ExtractionException;
43		import org.owasp.dependencycheck.utils.ExtractionUtil;
44		import org.owasp.dependencycheck.utils.FileFilterBuilder;
45		import org.owasp.dependencycheck.utils.FileUtils;
46		import org.owasp.dependencycheck.utils.Settings;
47		import org.owasp.dependencycheck.utils.UrlStringUtils;
48
49		/**
50		* Used to analyze a Wheel or egg distribution files, or their contents in
51		* unzipped form, and collect information that can be used to determine the
52		* associated CPE.
53		*
54		* @author Dale Visser
55		*/
56		@Experimental
57	14	public class PythonDistributionAnalyzer extends AbstractFileTypeAnalyzer {
58
59		/**
60		* Name of egg metadata files to analyze.
61		*/
62		private static final String PKG_INFO = "PKG-INFO";
63
64		/**
65		* Name of wheel metadata files to analyze.
66		*/
67		private static final String METADATA = "METADATA";
68
69		/**
70		* The logger.
71		*/
72	1	private static final Logger LOGGER = LoggerFactory
73	1	.getLogger(PythonDistributionAnalyzer.class);
74
75		/**
76		* The count of directories created during analysis. This is used for
77		* creating temporary directories.
78		*/
79	1	private static int dirCount = 0;
80
81		/**
82		* The name of the analyzer.
83		*/
84		private static final String ANALYZER_NAME = "Python Distribution Analyzer";
85		/**
86		* The phase that this analyzer is intended to run in.
87		*/
88	1	private static final AnalysisPhase ANALYSIS_PHASE = AnalysisPhase.INFORMATION_COLLECTION;
89
90		/**
91		* The set of file extensions supported by this analyzer.
92		*/
93	1	private static final String[] EXTENSIONS = {"whl", "egg", "zip"};
94
95		/**
96		* Used to match on egg archive candidate extensions.
97		*/
98	1	private static final FileFilter EGG_OR_ZIP = FileFilterBuilder.newInstance().addExtensions("egg", "zip").build();
99
100		/**
101		* Used to detect files with a .whl extension.
102		*/
103	1	private static final FileFilter WHL_FILTER = FileFilterBuilder.newInstance().addExtensions("whl").build();
104
105		/**
106		* The parent directory for the individual directories per archive.
107		*/
108		private File tempFileLocation;
109
110		/**
111		* Filter that detects *.dist-info files (but doesn't verify they are
112		* directories.
113		*/
114	1	private static final FilenameFilter DIST_INFO_FILTER = new SuffixFileFilter(
115		".dist-info");
116
117		/**
118		* Filter that detects files named "METADATA".
119		*/
120	1	private static final FilenameFilter EGG_INFO_FILTER = new NameFileFilter(
121		"EGG-INFO");
122
123		/**
124		* Filter that detects files named "METADATA".
125		*/
126	1	private static final NameFileFilter METADATA_FILTER = new NameFileFilter(
127		METADATA);
128
129		/**
130		* Filter that detects files named "PKG-INFO".
131		*/
132	1	private static final NameFileFilter PKG_INFO_FILTER = new NameFileFilter(
133		PKG_INFO);
134
135		/**
136		* The file filter used to determine which files this analyzer supports.
137		*/
138	2	private static final FileFilter FILTER = FileFilterBuilder.newInstance().addFileFilters(
139	1	METADATA_FILTER, PKG_INFO_FILTER).addExtensions(EXTENSIONS).build();
140
141		/**
142		* Returns the FileFilter
143		*
144		* @return the FileFilter
145		*/
146		@Override
147		protected FileFilter getFileFilter() {
148	15	return FILTER;
149		}
150
151		/**
152		* Returns the name of the analyzer.
153		*
154		* @return the name of the analyzer.
155		*/
156		@Override
157		public String getName() {
158	15	return ANALYZER_NAME;
159		}
160
161		/**
162		* Returns the phase that the analyzer is intended to run in.
163		*
164		* @return the phase that the analyzer is intended to run in.
165		*/
166		@Override
167		public AnalysisPhase getAnalysisPhase() {
168	4	return ANALYSIS_PHASE;
169		}
170
171		/**
172		* Returns the key used in the properties file to reference the analyzer's
173		* enabled property.
174		*
175		* @return the analyzer's enabled property setting key
176		*/
177		@Override
178		protected String getAnalyzerEnabledSettingKey() {
179	14	return Settings.KEYS.ANALYZER_PYTHON_DISTRIBUTION_ENABLED;
180		}
181
182		@Override
183		protected void analyzeFileType(Dependency dependency, Engine engine)
184		throws AnalysisException {
185	6	final File actualFile = dependency.getActualFile();
186	6	if (WHL_FILTER.accept(actualFile)) {
187	1	collectMetadataFromArchiveFormat(dependency, DIST_INFO_FILTER,
188		METADATA_FILTER);
189	5	} else if (EGG_OR_ZIP.accept(actualFile)) {
190	2	collectMetadataFromArchiveFormat(dependency, EGG_INFO_FILTER,
191		PKG_INFO_FILTER);
192		} else {
193	3	final String name = actualFile.getName();
194	3	final boolean metadata = METADATA.equals(name);
195	3	if (metadata \|\| PKG_INFO.equals(name)) {
196	3	final File parent = actualFile.getParentFile();
197	3	final String parentName = parent.getName();
198	3	dependency.setDisplayFileName(parentName + "/" + name);
199	3	if (parent.isDirectory()
200	1	&& (metadata && parentName.endsWith(".dist-info")
201	2	\|\| parentName.endsWith(".egg-info") \|\| "EGG-INFO"
202	1	.equals(parentName))) {
203	3	collectWheelMetadata(dependency, actualFile);
204		}
205		}
206		}
207	6	}
208
209		/**
210		* Collects the meta data from an archive.
211		*
212		* @param dependency the archive being scanned
213		* @param folderFilter the filter to apply to the folder
214		* @param metadataFilter the filter to apply to the meta data
215		* @throws AnalysisException thrown when there is a problem analyzing the
216		* dependency
217		*/
218		private void collectMetadataFromArchiveFormat(Dependency dependency,
219		FilenameFilter folderFilter, FilenameFilter metadataFilter)
220		throws AnalysisException {
221	3	final File temp = getNextTempDirectory();
222	3	LOGGER.debug("{} exists? {}", temp, temp.exists());
223		try {
224	6	ExtractionUtil.extractFilesUsingFilter(
225	3	new File(dependency.getActualFilePath()), temp,
226		metadataFilter);
227	0	} catch (ExtractionException ex) {
228	0	throw new AnalysisException(ex);
229	3	}
230
231	6	collectWheelMetadata(
232		dependency,
233	3	getMatchingFile(getMatchingFile(temp, folderFilter),
234		metadataFilter));
235	3	}
236
237		/**
238		* Makes sure a usable temporary directory is available.
239		*
240		* @throws InitializationException an AnalyzeException is thrown when the
241		* temp directory cannot be created
242		*/
243		@Override
244		protected void initializeFileTypeAnalyzer() throws InitializationException {
245		try {
246	8	final File baseDir = Settings.getTempDirectory();
247	8	tempFileLocation = File.createTempFile("check", "tmp", baseDir);
248	8	if (!tempFileLocation.delete()) {
249	0	setEnabled(false);
250	0	final String msg = String.format(
251		"Unable to delete temporary file '%s'.",
252	0	tempFileLocation.getAbsolutePath());
253	0	throw new InitializationException(msg);
254		}
255	8	if (!tempFileLocation.mkdirs()) {
256	0	setEnabled(false);
257	0	final String msg = String.format(
258		"Unable to create directory '%s'.",
259	0	tempFileLocation.getAbsolutePath());
260	0	throw new InitializationException(msg);
261		}
262	0	} catch (IOException ex) {
263	0	setEnabled(false);
264	0	throw new InitializationException("Unable to create a temporary file", ex);
265	8	}
266	8	}
267
268		/**
269		* Deletes any files extracted from the Wheel during analysis.
270		*/
271		@Override
272		public void close() {
273	10	if (tempFileLocation != null && tempFileLocation.exists()) {
274	8	LOGGER.debug("Attempting to delete temporary files");
275	8	final boolean success = FileUtils.delete(tempFileLocation);
276	8	if (!success) {
277	1	LOGGER.warn(
278		"Failed to delete some temporary files, see the log for more details");
279		}
280		}
281	10	}
282
283		/**
284		* Gathers evidence from the METADATA file.
285		*
286		* @param dependency the dependency being analyzed
287		* @param file a reference to the manifest/properties file
288		*/
289		private static void collectWheelMetadata(Dependency dependency, File file) {
290	6	final InternetHeaders headers = getManifestProperties(file);
291	6	addPropertyToEvidence(headers, dependency.getVersionEvidence(),
292		"Version", Confidence.HIGHEST);
293	6	addPropertyToEvidence(headers, dependency.getProductEvidence(), "Name",
294		Confidence.HIGHEST);
295	6	final String url = headers.getHeader("Home-page", null);
296	6	final EvidenceCollection vendorEvidence = dependency
297	6	.getVendorEvidence();
298	6	if (StringUtils.isNotBlank(url)) {
299	6	if (UrlStringUtils.isUrl(url)) {
300	6	vendorEvidence.addEvidence(METADATA, "vendor", url,
301		Confidence.MEDIUM);
302		}
303		}
304	6	addPropertyToEvidence(headers, vendorEvidence, "Author", Confidence.LOW);
305	6	final String summary = headers.getHeader("Summary", null);
306	6	if (StringUtils.isNotBlank(summary)) {
307	6	JarAnalyzer
308	6	.addDescription(dependency, summary, METADATA, "summary");
309		}
310	6	}
311
312		/**
313		* Adds a value to the evidence collection.
314		*
315		* @param headers the properties collection
316		* @param evidence the evidence collection to add the value
317		* @param property the property name
318		* @param confidence the confidence of the evidence
319		*/
320		private static void addPropertyToEvidence(InternetHeaders headers,
321		EvidenceCollection evidence, String property, Confidence confidence) {
322	18	final String value = headers.getHeader(property, null);
323	18	LOGGER.debug("Property: {}, Value: {}", property, value);
324	18	if (StringUtils.isNotBlank(value)) {
325	18	evidence.addEvidence(METADATA, property, value, confidence);
326		}
327	18	}
328
329		/**
330		* Returns a list of files that match the given filter, this does not
331		* recursively scan the directory.
332		*
333		* @param folder the folder to filter
334		* @param filter the filter to apply to the files in the directory
335		* @return the list of Files in the directory that match the provided filter
336		*/
337		private static File getMatchingFile(File folder, FilenameFilter filter) {
338	6	File result = null;
339	6	final File[] matches = folder.listFiles(filter);
340	6	if (null != matches && 1 == matches.length) {
341	6	result = matches[0];
342		}
343	6	return result;
344		}
345
346		/**
347		* Reads the manifest entries from the provided file.
348		*
349		* @param manifest the manifest
350		* @return the manifest entries
351		*/
352		private static InternetHeaders getManifestProperties(File manifest) {
353	6	final InternetHeaders result = new InternetHeaders();
354	6	if (null == manifest) {
355	0	LOGGER.debug("Manifest file not found.");
356		} else {
357		try {
358	6	result.load(new AutoCloseInputStream(new BufferedInputStream(
359		new FileInputStream(manifest))));
360	0	} catch (MessagingException e) {
361	0	LOGGER.warn(e.getMessage(), e);
362	0	} catch (FileNotFoundException e) {
363	0	LOGGER.warn(e.getMessage(), e);
364	6	}
365		}
366	6	return result;
367		}
368
369		/**
370		* Retrieves the next temporary destination directory for extracting an
371		* archive.
372		*
373		* @return a directory
374		* @throws AnalysisException thrown if unable to create temporary directory
375		*/
376		private File getNextTempDirectory() throws AnalysisException {
377		File directory;
378
379		// getting an exception for some directories not being able to be
380		// created; might be because the directory already exists?
381		do {
382	3	dirCount += 1;
383	3	directory = new File(tempFileLocation, String.valueOf(dirCount));
384	3	} while (directory.exists());
385	3	if (!directory.mkdirs()) {
386	0	throw new AnalysisException(String.format(
387		"Unable to create temp directory '%s'.",
388	0	directory.getAbsolutePath()));
389		}
390	3	return directory;
391		}
392		}