+/*
+ * Copyright 2020-2022 Soren Stoutner <soren@stoutner.com>.
+ *
+ * This file is part of Privacy Browser Android <https://www.stoutner.com/privacy-browser-android>.
+ *
+ * Privacy Browser Android is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Privacy Browser Android is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Privacy Browser Android. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.stoutner.privacybrowser.helpers
+
+import android.content.Context
+import android.net.Uri
+import android.webkit.CookieManager
+import android.webkit.MimeTypeMap
+
+import com.stoutner.privacybrowser.R
+
+import java.lang.Exception
+import java.net.HttpURLConnection
+import java.net.URL
+import java.text.NumberFormat
+
+object UrlHelper {
+ // Content dispositions can contain other text besides the file name, and they can be in any order.
+ // Elements are separated by semicolons. Sometimes the file names are contained in quotes.
+ @JvmStatic
+ fun getFileName(context: Context, contentDispositionString: String?, contentTypeString: String?, urlString: String): String {
+ // Define a file name string.
+ var fileNameString: String
+
+ // Only process the content disposition string if it isn't null.
+ if (contentDispositionString != null) { // The content disposition is not null.
+ // Check to see if the content disposition contains a file name.
+ if (contentDispositionString.contains("filename=")) { // The content disposition contains a filename.
+ // Get the part of the content disposition after `filename=`.
+ fileNameString = contentDispositionString.substring(contentDispositionString.indexOf("filename=") + 9)
+
+ // Remove any `;` and anything after it. This removes any entries after the filename.
+ if (fileNameString.contains(";"))
+ fileNameString = fileNameString.substring(0, fileNameString.indexOf(";") - 1)
+
+ // Remove any `"` at the beginning of the string.
+ if (fileNameString.startsWith("\""))
+ fileNameString = fileNameString.substring(1)
+
+ // Remove any `"` at the end of the string.
+ if (fileNameString.endsWith("\""))
+ fileNameString = fileNameString.substring(0, fileNameString.length - 1)
+ } else { // The headers contain no useful information.
+ // Get the file name string from the URL.
+ fileNameString = getFileNameFromUrl(context, urlString, contentTypeString)
+ }
+ } else { // The content disposition is null.
+ // Get the file name string from the URL.
+ fileNameString = getFileNameFromUrl(context, urlString, contentTypeString)
+ }
+
+ // Return the file name string.
+ return fileNameString
+ }
+
+ private fun getFileNameFromUrl(context: Context, urlString: String, contentTypeString: String?): String {
+ // Convert the URL string to a URI.
+ val uri = Uri.parse(urlString)
+
+ // Get the last path segment.
+ var lastPathSegment = uri.lastPathSegment
+
+ // Use a default file name if the last path segment is null.
+ if (lastPathSegment == null) {
+ // Set the last path segment to be the generic file name.
+ lastPathSegment = context.getString(R.string.file)
+
+ // Add a file extension if it can be detected.
+ if (MimeTypeMap.getSingleton().hasMimeType(contentTypeString))
+ lastPathSegment = lastPathSegment + "." + MimeTypeMap.getSingleton().getExtensionFromMimeType(contentTypeString)
+ }
+
+ // Return the last path segment as the file name.
+ return lastPathSegment
+ }
+
+ fun getNameAndSize(context: Context, urlString: String, userAgent: String, cookiesEnabled: Boolean): Pair<String, String> {
+ // Define the strings.
+ var fileNameString: String
+ var formattedFileSize: String
+
+ // Populate the file size and name strings.
+ if (urlString.startsWith("data:")) { // The URL contains the entire data of an image.
+ // Remove `data:` from the beginning of the URL.
+ val urlWithoutData = urlString.substring(5)
+
+ // Get the URL MIME type, which ends with a `;`.
+ val urlMimeType = urlWithoutData.substring(0, urlWithoutData.indexOf(";"))
+
+ // Get the Base64 data, which begins after a `,`.
+ val base64DataString = urlWithoutData.substring(urlWithoutData.indexOf(",") + 1)
+
+ // Calculate the file size of the data URL. Each Base64 character represents 6 bits.
+ formattedFileSize = NumberFormat.getInstance().format(base64DataString.length * 3L / 4) + " " + context.getString(R.string.bytes)
+
+ // Set the file name according to the MIME type.
+ fileNameString = context.getString(R.string.file) + "." + MimeTypeMap.getSingleton().getExtensionFromMimeType(urlMimeType)
+ } else { // The URL refers to the location of the data.
+ // Initialize the formatted file size string.
+ formattedFileSize = context.getString(R.string.unknown_size)
+
+ // Because everything relating to requesting data from a webserver can throw errors, the entire section must catch exceptions.
+ try {
+ // Convert the URL string to a URL.
+ val url = URL(urlString)
+
+ // Instantiate the proxy helper.
+ val proxyHelper = ProxyHelper()
+
+ // Get the current proxy.
+ val proxy = proxyHelper.getCurrentProxy(context)
+
+ // Open a connection to the URL. No data is actually sent at this point.
+ val httpUrlConnection = url.openConnection(proxy) as HttpURLConnection
+
+ // Add the user agent to the header property.
+ httpUrlConnection.setRequestProperty("User-Agent", userAgent)
+
+ // Add the cookies if they are enabled.
+ if (cookiesEnabled) {
+ // Get the cookies for the current domain.
+ val cookiesString = CookieManager.getInstance().getCookie(url.toString())
+
+ // Add the cookies if they are not null.
+ if (cookiesString != null)
+ httpUrlConnection.setRequestProperty("Cookie", cookiesString)
+ }
+
+ // The actual network request is in a `try` bracket so that `disconnect()` is run in the `finally` section even if an error is encountered in the main block.
+ try {
+ // Get the status code. This initiates a network connection.
+ val responseCode = httpUrlConnection.responseCode
+
+ // Check the response code.
+ if (responseCode >= 400) { // The response code is an error message.
+ // Set the formatted file size to indicate a bad URL.
+ formattedFileSize = context.getString(R.string.invalid_url)
+
+ // Set the file name according to the URL.
+ fileNameString = getFileNameFromUrl(context, urlString, null)
+ } else { // The response code is not an error message.
+ // Get the headers.
+ val contentLengthString = httpUrlConnection.getHeaderField("Content-Length")
+ val contentDispositionString = httpUrlConnection.getHeaderField("Content-Disposition")
+ var contentTypeString = httpUrlConnection.contentType
+
+ // Remove anything after the MIME type in the content type string.
+ if (contentTypeString.contains(";"))
+ contentTypeString = contentTypeString.substring(0, contentTypeString.indexOf(";"))
+
+ // Only process the content length string if it isn't null.
+ if (contentLengthString != null) {
+ // Convert the content length string to a long.
+ val fileSize = contentLengthString.toLong()
+
+ // Format the file size.
+ formattedFileSize = NumberFormat.getInstance().format(fileSize) + " " + context.getString(R.string.bytes)
+ }
+
+ // Get the file name string from the content disposition.
+ fileNameString = getFileName(context, contentDispositionString, contentTypeString, urlString)
+ }
+ } finally {
+ // Disconnect the HTTP URL connection.
+ httpUrlConnection.disconnect()
+ }
+ } catch (exception: Exception) {
+ // Set the formatted file size to indicate a bad URL.
+ formattedFileSize = context.getString(R.string.invalid_url)
+
+ // Set the file name according to the URL.
+ fileNameString = getFileNameFromUrl(context, urlString, null)
+ }
+ }
+
+ // Return the file name and size.
+ return Pair(fileNameString, formattedFileSize)
+ }
+
+ fun getSize(context: Context, url: URL, userAgent: String, cookiesEnabled: Boolean): String {
+ // Initialize the formatted file size string.
+ var formattedFileSize = context.getString(R.string.unknown_size)
+
+ // Because everything relating to requesting data from a webserver can throw errors, the entire section must catch exceptions.
+ try {
+ // Instantiate the proxy helper.
+ val proxyHelper = ProxyHelper()
+
+ // Get the current proxy.
+ val proxy = proxyHelper.getCurrentProxy(context)
+
+ // Open a connection to the URL. No data is actually sent at this point.
+ val httpUrlConnection = url.openConnection(proxy) as HttpURLConnection
+
+ // Add the user agent to the header property.
+ httpUrlConnection.setRequestProperty("User-Agent", userAgent)
+
+ // Add the cookies if they are enabled.
+ if (cookiesEnabled) {
+ // Get the cookies for the current domain.
+ val cookiesString = CookieManager.getInstance().getCookie(url.toString())
+
+ // Only add the cookies if they are not null.
+ if (cookiesString != null) {
+ // Add the cookies to the header property.
+ httpUrlConnection.setRequestProperty("Cookie", cookiesString)
+ }
+ }
+
+ // The actual network request is in a `try` bracket so that `disconnect()` is run in the `finally` section even if an error is encountered in the main block.
+ try {
+ // Get the status code. This initiates a network connection.
+ val responseCode = httpUrlConnection.responseCode
+
+ // Check the response code.
+ if (responseCode >= 400) { // The response code is an error message.
+ // Set the formatted file size to indicate a bad URL.
+ formattedFileSize = context.getString(R.string.invalid_url)
+ } else { // The response code is not an error message.
+ // Get the content length header.
+ val contentLengthString = httpUrlConnection.getHeaderField("Content-Length")
+
+ // Only process the content length string if it isn't null.
+ if (contentLengthString != null) {
+ // Convert the content length string to a long.
+ val fileSize = contentLengthString.toLong()
+
+ // Format the file size.
+ formattedFileSize = NumberFormat.getInstance().format(fileSize) + " " + context.getString(R.string.bytes)
+ }
+ }
+ } finally {
+ // Disconnect the HTTP URL connection.
+ httpUrlConnection.disconnect()
+ }
+ } catch (exception: Exception) {
+ // Set the formatted file size to indicate a bad URL.
+ formattedFileSize = context.getString(R.string.invalid_url)
+ }
+
+ // Return the formatted file size.
+ return formattedFileSize
+ }
+}
projects / PrivacyBrowserAndroid.git / commitdiff