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Save PDF file to Google Drive
3 Aug 20237 minutes to read
To save a PDF file to Google Drive, you can follow the steps below
Step 1 Set up Google Drive API
You must set up a project in the Google Developers Console and enable the Google Drive API. Obtain the necessary credentials to access the API. For more information, view the official link.
Step 2: Create a PDF Viewer sample in React
Follow the instructions provided in this link to create a simple PDF Viewer sample in React. This will set up the basic structure of your PDF Viewer application.
Step 3: Modify the PdfViewerController.cs
File in the Web Service Project
-
Create a web service project in .NET Core 3.0 or above. You can refer to this link for instructions on how to create a web service project.
-
Open the
PdfViewerController.cs
file in your web service project. -
Import the required namespaces at the top of the file:
using System.IO;
using Google.Apis.Drive.v3;
using Google.Apis.Util.Store;
- Add the following private fields and constructor parameters to the
PdfViewerController
class, In the constructor, assign the values from the configuration to the corresponding fields
private IConfiguration _configuration;
public readonly string folderId;
public readonly string applicationName;
public readonly string credentialPath;
private static readonly string[] Scopes = { DriveService.Scope.DriveFile, DriveService.Scope.DriveReadonly};
public PdfViewerController(IWebHostEnvironment hostingEnvironment, IMemoryCache cache, IConfiguration configuration)
{
_hostingEnvironment = hostingEnvironment;
_cache = cache;
_configuration = configuration;
folderId = _configuration.GetValue<string>("FolderId");
credentialPath = _configuration.GetValue<string>("CredentialPath");
applicationName = _configuration.GetValue<string>("ApplicationName");
}
- Modify the
Download()
method to save the downloaded PDF files to Google Drive bucket
[HttpPost("Download")]
[Microsoft.AspNetCore.Cors.EnableCors("MyPolicy")]
[Route("[controller]/Download")]
//Post action for downloading the PDF documents
public async Task<IActionResult> Download([FromBody] Dictionary<string, string> jsonObject)
{
//Initialize the PDF Viewer object with memory cache object
PdfRenderer pdfviewer = new PdfRenderer(_cache);
string documentBase = pdfviewer.GetDocumentAsBase64(jsonObject);
byte[] documentBytes = Convert.FromBase64String(documentBase.Split(",")[1]);
string documentId = jsonObject["documentId"];
string result = Path.GetFileNameWithoutExtension(documentId);
string fileName = result + "_downloaded.pdf";
UserCredential credential;
using (var memStream = new FileStream(credentialPath, FileMode.Open, FileAccess.Read))
{
string credPath = "token.json";
credential = await GoogleWebAuthorizationBroker.AuthorizeAsync(
GoogleClientSecrets.Load(memStream).Secrets,
Scopes,
"user",
CancellationToken.None,
new FileDataStore(credPath, true));
}
// Create the Drive API service.
var service = new DriveService(new BaseClientService.Initializer()
{
HttpClientInitializer = credential,
ApplicationName = applicationName,
});
var fileMetadata = new Google.Apis.Drive.v3.Data.File()
{
Name = fileName,
Parents = new List<string> { folderId }
};
FilesResource.CreateMediaUpload request;
using (var stream = new MemoryStream(documentBytes))
{
request = service.Files.Create(fileMetadata, stream, "application/pdf");
request.Fields = "id";
object value = await request.UploadAsync();
}
return Content(documentBase);
}
- Open the
appsettings.json
file in your web service project, Add the following lines below the existing"AllowedHosts"
configuration
{
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft.AspNetCore": "Warning"
}
},
"AllowedHosts": "*",
"FolderId": "Your Google Drive Folder ID",
"CredentialPath": "Your Path to the OAuth 2.0 Client IDs json file",
"ApplicationName": "Your Application name"
}
NOTE
Replace Your Google Drive Folder ID, Your Application name, and Your Path to the OAuth 2.0 Client IDs json file with your actual Google drive folder ID , Your name for your application and the path for the JSON file.
NOTE
The FolderId part is the unique identifier for the folder. For example, if your folder URL is:
https://drive.google.com/drive/folders/abc123xyz456
, then the folder ID isabc123xyz456
.
NOTE
You must use a unique
Client_ID
from json file to interface your application with the Google Drive API in order to save PDFs directly to Google Drive. This Client_ID will serve as the authentication key, allowing you to save files securely.
Step 4: Set the PDF Viewer Properties in React PDF viewer component
Modify the serviceUrl
property of the PDF viewer component with the accurate URL of your web service project, replacing https://localhost:44396/pdfviewer
with the actual URL of your server. Set the documentPath
property of the PDF viewer component to the desired name of the PDF file you wish to load from Google Drive. Ensure that you correctly pass the document name from the files available in your drive folder to the documentPath property.
import * as ReactDOM from 'react-dom';
import * as React from 'react';
import { PdfViewerComponent, Toolbar, Magnification, Navigation, LinkAnnotation, BookmarkView, ThumbnailView,
Print, TextSelection, Annotation, TextSearch, Inject, FormDesigner, FormFields} from '@syncfusion/ej2-react-pdfviewer';
function App() {
return (<div>
<div className='control-section'>
{/* Render the PDF Viewer */}
<PdfViewerComponent
id="container"
documentPath="PDF_Succinctly.pdf"
// Replace the "localhost:44396" with the actual URL of your server
serviceUrl="https://localhost:44396/pdfviewer"
style={{ 'height': '640px' }}>
<Inject services={[ Toolbar, Magnification, Navigation, Annotation, LinkAnnotation, BookmarkView,
ThumbnailView, Print, TextSelection, TextSearch, FormDesigner, FormFields ]} />
</PdfViewerComponent>
</div>
</div>);
}
const root = ReactDOM.createRoot(document.getElementById('sample'));
root.render(<App />);
NOTE
The Google.Cloud.Storage.V1 NuGet package must be installed in your application to use the previous code example.