Supported pdf viewing is there.

app/src/main/AndroidManifest.xml

@@ -26,6 +26,16 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.DeNaDrive"
         tools:targetApi="31">
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_paths" />
+        </provider>
+
         <activity
             android:name=".oauth.LoadingActivity"
             android:exported="false"

app/src/main/java/com/bbc/denadrive/DriveRequester.kt

@@ -26,7 +26,6 @@ object DriveRequester {
         context: Context,
         tree: FolderTree
     ) {
-        Log.e("MEOW", "populateTree: got here", )
         val myUrl = "https://www.googleapis.com/drive/v3/files?trashed=false&orderBy=folder"
         makeNewRequest(
             context = context,
@@ -38,25 +37,24 @@ object DriveRequester {
                 )
             }
         ) { response, exception ->
-            Log.e("MOO", "populateTree: and here", )
             if (exception != null) {
-                Log.e("RESPONSE EXCEPTION", "populateTree: ${exception.message}", )
+                Log.e("RESPONSE EXCEPTION", "populateTree: ${exception.message}")
             } else {
                 val responseBody = ResponsesHandler.newResponseArrived<DriveResponseBody>(response)
                 if (responseBody != null) {
                     tree.addChildren(
-                        responseBody.files.map { file -> FolderTree(
+                        responseBody.files.map { file ->
+                            FolderTree(
                                 value = file,
                                 ownPath = "${tree.ownPath}/${file.id}",
                                 parent = tree
-                        ) }
                             )
-                    Log.e("CURRENT", "populateTree: ${tree.value}", )
+                        }
-                    Log.e("CHILDREN", "populateTree: ${responseBody.files}", )
+                    )
+                    tree.loaded = true
                     for (child in tree.getChildren()) {
                         if (!child.isLeaf()) populateTree(context, child)
                     }
-                    Log.e("MOO", "populateTree: also here?", )
                 }
             }
         }

app/src/main/java/com/bbc/denadrive/FolderTree.kt

@@ -23,7 +23,8 @@ class FolderTree(
     val value: MyFile,
     val ownPath: String = value.id,
     private val children: MutableList<FolderTree> = mutableListOf(),
-    val parent: FolderTree? = null
+    val parent: FolderTree? = null,
+    var loaded: Boolean = false
 ) {
 
     fun isLeaf(): Boolean {

app/src/main/java/com/bbc/denadrive/HomeNotAuthActivity.kt

@@ -57,7 +57,7 @@ class HomeNotAuthActivity : ComponentActivity() {
             DeNaDriveTheme {
                 Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
                     val logo = painterResource(id = R.drawable.vecchiaicona_)
-                    LogoWithCaptionAndButton (
+                    LogoWithCaptionAndButton(
                         logo = logo,
                         caption = "DeNa Drive",
                         buttonText = "Log in",
@@ -77,16 +77,25 @@ class HomeNotAuthActivity : ComponentActivity() {
             "com.bbc.denadrive:/oauth2redirect".toUri()
         )
         val authRequest = authRequestBuilder
-            .setScope("https://www.googleapis.com/auth/drive")
+            .setScopes(
+                listOf(
+                    "https://www.googleapis.com/auth/drive",
+                    "https://www.googleapis.com/auth/drive.apps"
+                )
+            )
             .build()
 
         val authService = AuthorizationService(this)
         authService.performAuthorizationRequest(
             authRequest,
-            PendingIntent.getActivity(this, 0, Intent(this, LoadingActivity::class.java),
+            PendingIntent.getActivity(
-                PendingIntent.FLAG_MUTABLE),
+                this, 0, Intent(this, LoadingActivity::class.java),
-            PendingIntent.getActivity(this, 0, Intent(this, HomeNotAuthActivity::class.java),
+                PendingIntent.FLAG_MUTABLE
-                PendingIntent.FLAG_MUTABLE)
+            ),
+            PendingIntent.getActivity(
+                this, 0, Intent(this, HomeNotAuthActivity::class.java),
+                PendingIntent.FLAG_MUTABLE
+            )
         )
     }
 }

app/src/main/java/com/bbc/denadrive/MainActivity.kt

@@ -32,6 +32,7 @@ import com.bbc.denadrive.apihandlers.MyFile
 import com.bbc.denadrive.apihandlers.ResponsesHandler
 import com.bbc.denadrive.apihandlers.ResponsesViewer
 import com.bbc.denadrive.apihandlers.makeDriveApiCall
+import com.bbc.denadrive.filehandling.FileDownloader
 import com.bbc.denadrive.home.ScaffoldWithSidebar
 import com.bbc.denadrive.oauth.AuthStatePersistence
 import com.bbc.denadrive.ui.theme.DeNaDriveTheme
@@ -42,7 +43,12 @@ import okhttp3.HttpUrl
 class MainActivity : ComponentActivity() {
 
     private lateinit var responsesViewer: ResponsesViewer
-    private var currentPath: String = "root"
+    private val exportSupportedFiles: List<String> = listOf(
+        "document",
+        "drawing",
+        "presentation",
+        "spreadsheet",
+    )
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -64,6 +70,7 @@ class MainActivity : ComponentActivity() {
                 finish()
             }
         }
+        val fileDownloader = FileDownloader(this)
 
 //        goToFolder(parentFolder = "root", forward = true, isFirstRequest = true)
 
@@ -71,16 +78,28 @@ class MainActivity : ComponentActivity() {
 //            val navController = rememberNavController()
             ScaffoldWithSidebar(
                 responsesViewer,
-                { name ->
+                { file ->
                     Toast.makeText(
                         this,
-                        "You pressed the file $name",
+                        "You pressed the file ${file.name}",
                         Toast.LENGTH_SHORT
                     ).show()
+                    if (file.mimeType.substringAfterLast(".") in exportSupportedFiles) {
+                        fileDownloader.downloadFile(
+                            "https://www.googleapis.com/drive/v3/files/${file.id}/export",
+                            "application/pdf"
+                        )
+                    } else {
+                        Toast.makeText(
+                            this,
+                            "This file has no default action. Download support coming soon",
+                            Toast.LENGTH_SHORT
+                        ).show()
+                    }
                 },
                 { folder ->
                     responsesViewer.currentFolderTree.value =
-                        responsesViewer.currentFolderTree.value.stepForward(folder)
+                        responsesViewer.currentFolderTree.value.stepForward(folder.id)
 //                    responsesViewer.currentFolderTree.value =
 //                        responsesViewer.currentFolderTree.value.goToPath("$folder/")
 //                    parent ->
@@ -94,10 +113,17 @@ class MainActivity : ComponentActivity() {
     }
 
 
-//    private fun getApps() {
+    private fun getApps() {
-//        val myUrl = "https://www.googleapis.com/drive/v3/apps"
+        val myUrl = "https://www.googleapis.com/drive/v3/apps"
-//        makeNewRequest(myUrl) {  }
+        DriveRequester.makeNewRequest(this, myUrl, {  }) {
-//    }
+            response, exception ->
+            if (exception != null) {
+                Log.e("notGood", "getApps: $exception", )
+            } else {
+                Log.e("GOOD", "getApps: $response", )
+            }
+        }
+    }
 
 //    private fun askForFolder(folderId: String) {
 //        val myUrl = "https://www.googleapis.com/drive/v3/files"

app/src/main/java/com/bbc/denadrive/apihandlers/ApiCalls.kt

@@ -32,8 +32,9 @@ fun makeDriveApiCall(
     authState: AuthState,
     url: String,
 //    folderId: String,
-    builderModifier:(HttpUrl.Builder) -> Unit,
+    builderModifier: (HttpUrl.Builder) -> Unit,
-    callback: (String?, Exception?) -> Unit) {
+    callback: (String?, Exception?) -> Unit
+) {
     val authService = AuthorizationService(context)
     // _ = idToken
     authState.performActionWithFreshTokens(authService) { accessToken, _, ex ->

app/src/main/java/com/bbc/denadrive/filehandling/FileDownloader.kt

@@ -0,0 +1,88 @@
+package com.bbc.denadrive.filehandling
+
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
+import android.util.Log
+import androidx.core.content.FileProvider
+import com.bbc.denadrive.oauth.AuthStatePersistence
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+import okhttp3.HttpUrl.Companion.toHttpUrl
+import java.io.File
+import java.io.FileOutputStream
+import java.net.HttpURLConnection
+import java.net.URL
+
+class FileDownloader(private val context: Context) {
+
+    fun downloadFile(fileUrl: String, mimeType: String) {
+        CoroutineScope(Dispatchers.IO).launch {
+            val tempFile = downloadIt(fileUrl, mimeType)
+            withContext(Dispatchers.Main) {
+                tempFile?.let {
+                    openFile(it)
+                }
+            }
+        }
+    }
+
+    private fun downloadIt(fileUrl: String, mimeType: String): File? {
+        var tempFile: File? = null
+        val authState = AuthStatePersistence.retrieveAuthState(context)
+
+        try {
+            tempFile = File.createTempFile("tempFile", ".pdf", context.cacheDir)
+//            val builder = fileUrl.toHttpUrl().newBuilder()
+//            builder.addQueryParameter("mimeType", mimeType)
+//            val urlConnection = builder.build().toUrl().openConnection() as HttpURLConnection
+            val urlConnection = URL("$fileUrl?mimeType=application/pdf").openConnection() as HttpURLConnection
+            urlConnection.setRequestProperty("Authorization", "Bearer ${authState.accessToken}")
+            urlConnection.connect()
+
+//            val inputStream1 = urlConnection.inputStream
+//            val buffer1 = ByteArray(4)
+//            inputStream1.read(buffer1)
+//            val header = String(buffer1)
+//            if (!header.startsWith("%PDF")) {
+//                Log.e("FileDownloader", "Downloaded file is not a valid PDF")
+//            }
+
+            if (urlConnection.responseCode == HttpURLConnection.HTTP_OK) {
+                Log.e("MA", "downloadIt: andato", )
+                val inputStream = urlConnection.inputStream
+                val outputStream = FileOutputStream(tempFile)
+
+                val buffer = ByteArray(1024)
+                var bytesRead: Int
+                while (inputStream.read(buffer).also { bytesRead = it } != -1) {
+                    outputStream.write(buffer, 0, bytesRead)
+                }
+
+                outputStream.close()
+                inputStream.close()
+                urlConnection.disconnect()
+            } else {
+                Log.e("FileDownloader", "Error: ${urlConnection.responseCode} - ${urlConnection.responseMessage}")
+            }
+
+        } catch (e: Exception) {
+            Log.e("FileDownloader", "downloadIt: download failed", e)
+        }
+
+        return tempFile
+    }
+
+
+    private fun openFile(file: File) {
+        val uri: Uri = FileProvider.getUriForFile(context, "${context.packageName}.fileprovider", file)
+        val intent = Intent(Intent.ACTION_VIEW).apply {
+            setDataAndType(uri, "application/pdf")
+            addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+        }
+        context.startActivity(intent)
+    }
+
+}

app/src/main/java/com/bbc/denadrive/home/DebugScreens.kt

@@ -53,8 +53,8 @@ import com.bbc.denadrive.apihandlers.ResponsesViewer
 @Composable
 fun ScaffoldWithSidebar(
     responsesViewer: ResponsesViewer,
-    onFileClick: (String) -> Unit,
+    onFileClick: (MyFile) -> Unit,
-    onFolderClick: (String) -> Unit,
+    onFolderClick: (MyFile) -> Unit,
     doIt: () -> Unit,
 ) {
     // State to control the drawer
@@ -245,8 +245,8 @@ fun Loading(
 @Composable
 fun AnotherVisualizer(
     responsesViewer: ResponsesViewer,
-    onFileClick: (String) -> Unit,
+    onFileClick: (MyFile) -> Unit,
-    onFolderClick: (String) -> Unit
+    onFolderClick: (MyFile) -> Unit
 ) {
     val currentFolderTree = responsesViewer.currentFolderTree.value
     val updater1 = responsesViewer.updater1.value
@@ -256,6 +256,10 @@ fun AnotherVisualizer(
         Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
             Text(text = "How did you get here? You're inside a file...")
         }
+    } else if (!currentFolderTree.loaded) {
+        Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
+            Loading()
+        }
     } else if (currentFolderTree.getChildren().isEmpty()) {
         Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
             Text("Empty folder")
@@ -263,8 +267,8 @@ fun AnotherVisualizer(
         }
     } else {
         val fileList = currentFolderTree.getChildren().map { tree -> tree.value }
-        Log.e("Visualizer", "AnotherVisualizer: ${currentFolderTree.value}", )
+//        Log.e("Visualizer", "AnotherVisualizer: ${currentFolderTree.value}", )
-        Log.e("Visualizer", "AnotherVisualizer: ${currentFolderTree.getChildren()}", )
+//        Log.e("Visualizer", "AnotherVisualizer: ${currentFolderTree.getChildren()}", )
         Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.TopCenter) {
             LazyColumn {
                 items(fileList) { file ->
@@ -273,9 +277,7 @@ fun AnotherVisualizer(
                     val onClick = if (isFolder) onFolderClick
                     else onFileClick
                     LogoTextBox(logo, file.name) {
-                        onClick(
+                        onClick(file)
-                            if (isFolder) file.id else file.name
-                        )
                     }
                 }
             }
@@ -284,7 +286,7 @@ fun AnotherVisualizer(
 }
 
 fun getId(mimeType: String): Int {
-    val extracted = mimeType.drop("application/vnd.google-apps.".length)
+    val extracted = mimeType.substringAfterLast(".")
     return when (extracted) {
         "document" -> R.drawable.docslogo_ok
         "presentation" -> R.drawable.slideslogo_ok

app/src/main/res/xml/file_paths.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<paths>
+    <cache-path name="cache" path="." />
+</paths>