From 216b51d138a5f9c1d67e4dab6d485c297806783a Mon Sep 17 00:00:00 2001
From: Tom Hacohen <tom@stosb.com>
Date: Thu, 14 Mar 2019 19:14:34 +0000
Subject: [PATCH] Create a logger object to take care of all the logging.

---
 .../com/etesync/syncadapter/log/Logger.kt     | 126 ++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 app/src/main/java/com/etesync/syncadapter/log/Logger.kt

diff --git a/app/src/main/java/com/etesync/syncadapter/log/Logger.kt b/app/src/main/java/com/etesync/syncadapter/log/Logger.kt
new file mode 100644
index 00000000..2ae226e9
--- /dev/null
+++ b/app/src/main/java/com/etesync/syncadapter/log/Logger.kt
@@ -0,0 +1,126 @@
+/*
+ * Copyright © Ricki Hirner (bitfire web engineering).
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the GNU Public License v3.0
+ * which accompanies this distribution, and is available at
+ * http://www.gnu.org/licenses/gpl.html
+ */
+
+package com.etesync.syncadapter.log
+
+import android.annotation.SuppressLint
+import android.app.PendingIntent
+import android.content.Context
+import android.content.Intent
+import android.content.SharedPreferences
+import android.os.Process
+import android.preference.PreferenceManager
+import android.util.Log
+import android.widget.Toast
+import androidx.core.app.NotificationCompat
+import androidx.core.app.NotificationManagerCompat
+import com.etesync.syncadapter.App
+import com.etesync.syncadapter.Constants
+import com.etesync.syncadapter.R
+import com.etesync.syncadapter.model.ServiceDB
+import com.etesync.syncadapter.model.Settings
+import com.etesync.syncadapter.ui.AppSettingsActivity
+import org.apache.commons.lang3.time.DateFormatUtils
+import java.io.File
+import java.io.IOException
+import java.util.logging.FileHandler
+import java.util.logging.Level
+
+@SuppressLint("StaticFieldLeak")    // we'll only keep an app context
+object Logger : SharedPreferences.OnSharedPreferenceChangeListener {
+
+    private const val LOG_TO_FILE = "log_to_file"
+
+    val log = java.util.logging.Logger.getLogger("etesync")!!
+
+    private lateinit var context: Context
+
+    fun initialize(someContext: Context) {
+        context = someContext.applicationContext
+
+        reinitialize()
+    }
+
+    override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences, key: String) {
+        if (key == LOG_TO_FILE) {
+            log.info("Logging settings changed; re-initializing logger")
+            reinitialize()
+        }
+    }
+
+    private fun reinitialize() {
+        val dbHelper = ServiceDB.OpenHelper(context)
+        val settings = Settings(dbHelper.readableDatabase)
+
+        val logToFile = settings.getBoolean(App.LOG_TO_EXTERNAL_STORAGE, false)
+        val logVerbose = logToFile || Log.isLoggable(App.log.name, Log.DEBUG)
+
+        log.info("Verbose logging: $logVerbose; to file: $logToFile")
+
+        // set logging level according to preferences
+        val rootLogger = java.util.logging.Logger.getLogger("")
+        rootLogger.level = if (logVerbose) Level.ALL else Level.INFO
+
+        // remove all handlers and add our own logcat handler
+        rootLogger.useParentHandlers = false
+        rootLogger.handlers.forEach { rootLogger.removeHandler(it) }
+        rootLogger.addHandler(LogcatHandler)
+
+        val nm = NotificationManagerCompat.from(context)
+        // log to external file according to preferences
+        if (logToFile) {
+            val builder = NotificationCompat.Builder(context)
+            builder.setSmallIcon(R.drawable.ic_sd_storage_light)
+                    .setLargeIcon(App.getLauncherBitmap(context))
+                    .setContentTitle(context.getString(R.string.logging_davdroid_file_logging))
+                    .setLocalOnly(true)
+
+            val logDir = debugDir(context) ?: return
+            val logFile = File(logDir,
+                    "etesync-${Process.myPid()}-${DateFormatUtils.format(System.currentTimeMillis(), "yyyyMMdd-HHmmss")}.txt")
+
+            try {
+                val fileHandler = FileHandler(logFile.toString(), true)
+                fileHandler.formatter = PlainTextFormatter.DEFAULT
+                rootLogger.addHandler(fileHandler)
+
+                val prefIntent = Intent(context, AppSettingsActivity::class.java)
+                prefIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+
+                builder .setContentText(logDir.path)
+                        .setCategory(NotificationCompat.CATEGORY_STATUS)
+                        .setPriority(NotificationCompat.PRIORITY_HIGH)
+                        .setSubText(context.getString(R.string.logging_to_external_storage_warning))
+                        .setContentIntent(PendingIntent.getActivity(context, 0, prefIntent, PendingIntent.FLAG_UPDATE_CURRENT))
+                        .setOngoing(true)
+            } catch(e: IOException) {
+                log.log(Level.SEVERE, "Couldn't create log file", e)
+                Toast.makeText(context, context.getString(R.string.logging_couldnt_create_file), Toast.LENGTH_LONG).show()
+            }
+
+            nm.notify(Constants.NOTIFICATION_EXTERNAL_FILE_LOGGING, builder.build())
+        } else {
+            nm.cancel(Constants.NOTIFICATION_EXTERNAL_FILE_LOGGING)
+
+            // delete old logs
+            debugDir(context)?.deleteRecursively()
+        }
+    }
+
+    private fun debugDir(context: Context): File? {
+        val dir = File(context.filesDir, "debug")
+        if (dir.exists() && dir.isDirectory)
+            return dir
+
+        if (dir.mkdir())
+            return dir
+
+        Toast.makeText(context, context.getString(R.string.logging_couldnt_create_file), Toast.LENGTH_LONG).show()
+        return null
+    }
+}
\ No newline at end of file