static file helpers

app/ux-analytics/monitor/src/main/java/org/phoebus/applications/uxanalytics/monitor/FileUtils.java

@@ -0,0 +1,74 @@
+package org.phoebus.applications.uxanalytics.monitor;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+public class FileUtils {
+
+    public static final String GIT_METADATA_DIR = ".git";
+    public static final String SVN_METADATA_DIR = ".svn";
+    public static final String HG_METADATA_DIR = ".hg";
+
+    private static boolean isGitRepo(File fileObject){
+        return isRepo(fileObject, GIT_METADATA_DIR);
+    }
+
+    private static boolean isSVNRepo(File fileObject){
+        return isRepo(fileObject, SVN_METADATA_DIR);
+    }
+
+    private static boolean isMercurialRepo(File fileObject){
+        return isRepo(fileObject, HG_METADATA_DIR);
+    }
+
+    private static boolean isRepo(File fileObject, String repoType){
+       File file = new File(fileObject.getAbsolutePath() + File.separator + repoType);
+         return file.exists() && file.isDirectory();
+    }
+
+    public static boolean isSourceRoot(File fileObject){
+        return isGitRepo(fileObject) || isSVNRepo(fileObject) || isMercurialRepo(fileObject);
+    }
+
+    public static File findSourceRootOf(File fileObject) {
+        File directory = fileObject.getParentFile();
+        while (directory != null) {
+            if (isSourceRoot(directory)) {
+                return directory;
+            }
+            directory = directory.getParentFile();
+        }
+        return null;
+    }
+
+    //re-implement here with Java MessageDigest, so we don't need to depend on elog
+    private static String getFileSHA256(File fileObject){
+        try(InputStream fis = new FileInputStream(fileObject)){
+            MessageDigest digest = MessageDigest.getInstance("SHA-256");
+
+            byte[] byteBuffer = new byte[1024];
+            int bytesCount = 0;
+
+            while((bytesCount = fis.read(byteBuffer)) != -1){
+                digest.update(byteBuffer, 0, bytesCount);
+            }
+
+            byte[] bytes = digest.digest();
+
+            StringBuilder sb = new StringBuilder();
+            for(int i=0; i< bytes.length ;i++){
+                sb.append(Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1));
+            }
+
+            return sb.toString();
+
+        } catch(IOException | NoSuchAlgorithmException e){;
+            throw new RuntimeException(e);
+        }
+    }
+
+}