Google Drive files MD5 checksum to Google Sheets and exporting the Sheets data to text file

README.md

@@ -61,6 +61,7 @@ width="96px"/>
 ### Drive
 - [Manage Google Drive files and folders](drive/quickstart)
 - [View Google Drive activity](drive/activity)
+- [Get MD5-checksum of all files and sub-directories](drive/md5-checksum)
 
 <img
 src="https://www.gstatic.com/images/branding/product/2x/forms_96dp.png"

drive/md5-checksum/ExportHashValuesToText.gs

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+/**
+ * Export the hash values stored in Google Sheets to Text file 
+ */
+
+// add the function to Google Sheets menu
+function onOpen() {
+  var thisSS = SpreadsheetApp.getActiveSpreadsheet(); // get active Spreadsheet
+   var myFs = [
+     {name: "Export hash (.txt)", functionName: "exportHashToText"}, // Option to export Hash and File location
+     {name: "Export filename (.txt)", functionName: "exportFilenameToText"}, // Option to export only file location
+   ];
+   thisSS.addMenu("Extra Custom Tools", myFs); 
+}
+
+// get Data in sorted form from the sheet
+function getData(){
+  var thisSS = SpreadsheetApp.getActiveSpreadsheet(); // get active Spreadsheet
+  var currSheet = thisSS.getActiveSheet(); // get the active sheet name
+  var range = currSheet.getRange("A:B"); // select columns containing the hash value and path
+  range.sort(2); // Sorts by the values in the second column (B)
+  return currSheet.getDataRange().getValues(); // return the values in the sheet
+}
+
+// Save data to a text file
+function saveToTextFile(text){
+  var myName = Browser.inputBox("The file named here will be appeared in your Docs list.", Browser.Buttons.OK_CANCEL);
+  if (myName == "cancel"){
+  } else {
+    DriveApp.createFile(myName + ".txt", text);
+  }
+}
+
+// Get Hash values and file path from the sheet
+function exportHashToText(){
+  var data = getData(); // get Data in sorted form from the sheet function
+
+  var text = data.map(function (row) {
+    if(row[0]==""){
+      hash_val='--------------------------------';
+    }else{
+      hash_val=row[0];
+    }
+    return hash_val + "\t" + row[1];
+  }).join('\n'); // join the values of data
+
+  saveToTextFile(text); // Save data to a text file function
+}
+
+// Get file path from the sheet
+function exportFilenameToText(){
+  var data = getData(); // get Data in sorted form from the sheet function
+
+  var text = data.map(function (row) {
+    return row[1];
+  }).join('\n'); // join the values of data
+
+  saveToTextFile(text); // Save data to a text file function
+}

drive/md5-checksum/GoogleDriveHashToSheets.gs

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+/**
+ * Get the hash values of files in Google Drive and store it in Google Sheets
+ */
+
+function driveHash() {
+  var folderId="<folderID>"; // Null for root Directory or set Folder ID: https://drive.google.com/drive/folders/<folderID>?usp=sharing
+  var sheetName="Sheet1";  // Name of the sheet
+  var sheetId="<sheetID>" // Google Sheets ID: https://docs.google.com/spreadsheets/d/<sheetID>/edit#gid=0
+  var rootPattern=".";
+  var pathPattern="\\" // "\\" for "\" and "/" for "/"
+  if(folderId!=""){
+    var folder=DriveApp.getFolderById(folderId); // retrive folder by folder ID if not Null
+  }
+  var ss = SpreadsheetApp.openById(sheetId); // retrive Spreadsheet by Spreadsheet ID
+  SpreadsheetApp.setActiveSpreadsheet(ss); // get active Spreadsheet
+  var sheet = ss.getSheetByName(sheetName); // get Sheet by Sheet name in the Spreadsheet
+  sheet.clear(); // clear all data
+  listFolders(DriveApp,sheet,folder,rootPattern,pathPattern);
+}
+
+// recursive function to get hash values of all files and subdirectories 
+function listFolders(dApp,sheet,folder,path,pathPattern) {
+  folder = folder || dApp.getRootFolder(); // get the folder passed in arguments else start from root Directory
+  var files = folder.getFiles(); // get files in present folder
+
+  while ( files.hasNext() ) { 
+    file=files.next()
+    md5_val=Drive.Files.get(file.getId())['md5Checksum']; // retrive MD5 hash from the file properties calculated by Google Drive
+    full_path=path+pathPattern+file.getName(); // retrive the path to the file
+    sheet.appendRow([md5_val, full_path]); // store the full path and hash value in Google Sheets
+    // Logger.log(md5_val + "\t" + full_path);
+  }
+
+  var subfolders = folder.getFolders(); // retrive subfolders to iterate over nested folders and files
+  while (subfolders.hasNext()) {
+    subfolder=subfolders.next();
+    listFolders(dApp,sheet,subfolder,path+pathPattern+subfolder.getName(),pathPattern); // recursive function to get hash values of all files and subdirectories 
+  }
+}