I have created static web site which I am planning to host in S3 bucket. This HTML has a form and attachment feature which will be sent to my email id when user will attach a file and hit 'Upload'. Below is my HTML code snippets - 

```
<form enctype="multipart/form-data"  name="fileinfo">
            <label>Your email address:</label>
            <input id = "email "type="email" autocomplete="on" autofocus name="userid" placeholder="email" required size="32" maxlength="64" /><br />
            <label>Custom file label:</label>
            <input type="text" name="filelabel" size="12" maxlength="32" /><br />
            <label>File to stash:</label>
            <input type="file" name="file" id = "fileUpload" required />
             <input type="button" id = "upload" value="Upload!" />
        </form>​

```

and then Jquery to trigger POST request to AWS API gateway

```
$('#upload').on("click", function (){
  var oOutput = document.querySelector("div"),
      oData = new FormData(form);

    var xhttp = new XMLHttpRequest();

    xhttp.onreadystatechange = function() {
          if (this.readyState == 4 && this.status == 200) {
            // Typical action to be performed when the document is ready:
             console.log(xhttp.responseText);
            console.log(xhttp.statusText);
            console.log(xhttp.status);
            oOutput.innerHTML = xhttp.responseText;
            } else {
                oOutput.innerHTML = "Error " + xhttp.status + " occurred when trying to upload your file.<br \/>";
            }
          };

    xhttp.open("POST", "https://myLambdaAPIURL", true);
    xhttp.setRequestHeader("Content-type", "application/json;charset=UTF-8");
    xhttp.send(JSON.stringify({Email:$('#email').val(),fileUpload:$('#fileUpload').val()}));

```

API gateway in AWS has all the default configurations to process the json format.

My AWS lambda code which works fine to send just an email.

```
import smtplib , os
from email.mime.image import MIMEImage
from email.mime.multipart import MIMEMultipart
from email.mime.application import MIMEApplication
from email.mime.base import MIMEBase
from email.message import Message
from email.encoders import encode_base64
from email.mime.text import MIMEText
from mimetypes import guess_type

def lambda_handler(event, context):
    msg = MIMEMultipart()
    msg['Subject'] = 'File Uploaded'
    msg['From'] = 'user@gmail.com'
    msg['To'] = 'user@gmail.com'
    emailFrom = "user@gmail.com"
    emailTo ="user@gmail.com"

    for file in event['fileUpload']:
        mimetype, encoding = guess_type(file)
        if mimetype == None:
            mimetype = "text/plain"
        mimetype = mimetype.split('/',1)    
        fp = open(file, "rb")       
        attachment.set_payload(fp.read())
        fp.close()
        encode_base64(attachment)
        attachment.add_header('Content-Disposition', 'attachment', file=os.path.basename(file))
        msg.attach(attachment)
    s = smtplib.SMTP('smtp.gmail.com:587')
    s.starttls()
    s.login('user@gmail.com','password')
    response = s.sendmail(emailFrom, emailTo, msg.as_string())
    s.quit()

return response

```

But when I attach a file and try to process it, the fake path error comes 

> 
> {"stackTrace": [["/var/task/pyLambda.py", 24, "lambda\_handler", "fo = open(filename, \"rb\")"]], "errorType": "IOError", "errorMessage": "[Errno 2] No such file or directory: u'C:\\fakepath\\testing.txt'"}
> 
> 
> 

so I am thinking may be I can use \tmp directory in AWS lambda but not sure how to do that.

Any help or any guidance is highly appreciated.