Gets the specified message attachment. Try it now or see an example.
Request
HTTP request
GET https://www.googleapis.com/gmail/v1/users/userId/messages/messageId/attachments/id
Parameters
| Parameter name | Value | Description |
|---|---|---|
| Path parameters | ||
id |
string |
The ID of the attachment. |
messageId |
string |
The ID of the message containing the attachment. |
userId |
string |
The user's email address. The special value me
can be used to indicate the authenticated user.
|
Authorization
This request requires authorization with at least one of the following scopes:
| Scope |
|---|
https://mail.google.com/ |
https://www.googleapis.com/auth/gmail.modify |
https://www.googleapis.com/auth/gmail.readonly |
For more information, see the authentication and authorization page.
Request body
Do not supply a request body with this method.
Response
If successful, this method returns a Users.messages.attachments resource in the response body.
Examples
Note: The code examples available for this method do not represent all supported programming languages (see the client libraries page for a list of supported languages).
Java
Uses the Java client library.
import com.google.api.client.repackaged.org.apache.commons.codec.binary.Base64;
import com.google.api.services.gmail.Gmail;
import com.google.api.services.gmail.model.Message;
import com.google.api.services.gmail.model.MessagePart;
import com.google.api.services.gmail.model.MessagePartBody;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
// ...
public class MyClass {
// ...
/**
* Get the attachments in a given email.
*
* @param service Authorized Gmail API instance.
* @param userId User's email address. The special value "me"
* can be used to indicate the authenticated user.
* @param messageId ID of Message containing attachment..
* @throws IOException
*/
public static void getAttachments(Gmail service, String userId, String messageId)
throws IOException {
Message message = service.users().messages().get(userId, messageId).execute();
List<MessagePart> parts = message.getPayload().getParts();
for (MessagePart part : parts) {
if (part.getFilename() != null && part.getFilename().length() > 0) {
String filename = part.getFilename();
String attId = part.getBody().getAttachmentId();
MessagePartBody attachPart = service.users().messages().attachment().
get(userId, messageId, attId).execute();
Base64 base64Url = new Base64(true);
byte[] fileByteArray = base64url.decodeBase64(attachPart.getData());
FileOutputStream fileOutFile =
new FileOutputStream("directory_to_store_attachments" + filename);
fileOutFile.write(fileByteArray);
fileOutFile.close();
}
}
}
// ...
}
.NET
Uses the .NET client library.
using Google.Apis.Gmail.v1;
using Google.Apis.Gmail.v1.Data;
using System;
using System.Collections.Generic;
using System.IO;
// ...
public class MyClass {
// ...
/// <summary>
/// Get and store attachment from Message with given ID.
/// </summary>
/// <param name="service">Gmail API service instance.</param>
/// <param name="userId">User's email address. The special value "me"
/// can be used to indicate the authenticated user.</param>
/// <param name="messageId">ID of Message containing attachment.</param>
/// <param name="outputDir">Directory used to store attachments.</param>
public static void GetAttachments(GmailService service, String userId, String messageId, String outputDir)
{
try
{
Message message = service.Users.Messages.Get(userId, messageId).Execute();
IList<MessagePart> parts = message.Payload.Parts;
foreach (MessagePart part in parts)
{
if (!String.IsNullOrEmpty(part.Filename))
{
String attId = part.Body.AttachmentId;
MessagePartBody attachPart = service.Users.Messages.Attachments.Get(userId, messageId, attId).Execute();
// Converting from RFC 4648 base64 to base64url encoding
// see http://en.wikipedia.org/wiki/Base64#Implementations_and_history
String attachData = attachPart.Data.Replace('-', '+');
attachData = attachData.Replace('_', '/');
byte[] data = Convert.FromBase64String(attachData);
File.WriteAllBytes(Path.Combine(outputDir, part.Filename), data);
}
}
}
catch (Exception e)
{
Console.WriteLine("An error occurred: " + e.Message);
}
}
// ...
}
Python
Uses the Python client library.
"""Retrieve an attachment from a Message.
"""
import base64
from apiclient import errors
def GetAttachments(service, user_id, msg_id, store_dir):
"""Get and store attachment from Message with given id.
Args:
service: Authorized Gmail API service instance.
user_id: User's email address. The special value "me"
can be used to indicate the authenticated user.
msg_id: ID of Message containing attachment.
store_dir: The directory used to store attachments.
"""
try:
message = service.users().messages().get(userId=user_id, id=msg_id).execute()
for part in message['payload']['parts']:
if part['filename']:
file_data = base64.urlsafe_b64decode(part['body']['data']
.encode('UTF-8'))
path = ''.join([store_dir, part['filename']])
f = open(path, 'w')
f.write(file_data)
f.close()
except errors.HttpError, error:
print 'An error occurred: %s' % error
JavaScript
Does not use a client library.
/**
* Get Attachments from a given Message.
*
* @param {String} userId User's email address. The special value 'me'
* can be used to indicate the authenticated user.
* @param {String} messageId ID of Message with attachments.
* @param {Function} callback Function to call when the request is complete.
*/
function getAttachments(userId, message, callback) {
var parts = message.payload.parts;
for (var i = 0; i < parts.length; i++) {
var part = parts[i];
if (part.filename && part.filename.length > 0) {
var attachId = part.body.attachmentId;
var request = gapi.client.gmail.users.messages.attachments.get({
'id': attachId,
'messageId': message.id,
'userId': userId
});
request.execute(function(attachment) {
callback(part.filename, part.mimeType, attachment);
});
}
}
}
Try it!
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