Get sender email from gmail-api

Question

I am using the gmail-api and having trouble getting the email of the sender. I am talking about the "full" format of the email. I consider the email of the sender to be the one that is actually written in the "From" field using the web interface of gmail. The headers of this full format usually include stuff like "X-Original-Authentication-Results" from which normally I can retrieve the smtp.mail value which is the sender's email but there are other emails where this header cannot be found.

This is my code so far:

if ("X-Original-Authentication-Results" == $header["name"]) {
        $value = $header["value"];
        preg_match("/smtp.mail=(.*)/", $value, $emailFound);
        $parsedEmail = $emailFound[1];
}

and here is a typical format of some headers:

[headers] => Array
                    (
                        [0] => Array
                            (
                                [name] => Delivered-To
                                [value] => randomemail@gmail.com
                            )

                        [1] => Array
                            (
                                [name] => Received
                                [value] => ................
                            )

                        [2] => Array
                            (
                                [name] => X-Received
                                [value] => ................
                            )

                        [3] => Array
                            (
                                [name] => Return-Path
                                [value] => 
                            )

                        [4] => Array
                            (
                                [name] => Received
                                [value] => ................
                            )

                        [5] => Array
                            (
                                [name] => Received-SPF
                                [value] => ................
                            )

                        [6] => Array
                            (
                                [name] => Authentication-Results
                                [value] => ................
                            )
........

So is there a solid way to get the correct email of the sender? Thank you in advance!

Answer 1

Loop through the headers[] array and look for the one with the 'name' = "From" (or whatever the header name is you're interested in). Note there may be multiple headers with that name. There are some standard headers that will usually exist (To, From, Subject) but I don't believe that's mandated by the RFC.

Answer 2

Know this question is from a while back, but I ran into this problem recently and couldn't really find any solutions online - so thought I'd share my findings.

Basically wrapping it in the htmlentities() would do the trick - but you'd have to access the part directly; as such:-

$part = $message->payload['modelData']['headers'][0]['value']; 
echo htmlentities($part);

It seems that the API is removing the values because when you do a var_dump on the payload, the string value is actually visible.

 ["name"]=> string(11) "Return-Path" ["value"]=> string(21) ""

This works on the FROM part too. Just thought this would a much easier way to demonstrate it. :)

Answer 3

I did a few experiments. the header from API Users.messages: get

header of "From"

{
    "name": "From",
    "value": "Ray Lin \u003cray@xxx.com\u003e"
 }

Experiments:

  foreach($headers as $header){ if($header->name==="From")  $from = $header->value;}

// experiment 1:
    preg_match('/\\\u003c(.*?)\\\u003e/', $from, $match);
    echo $match[1]; // empty


// experiment 2:(use a string instead)
    $str = 'Ray Lin \u003cray@xxx.com\u003e';
    preg_match('/\\\u003c(.*?)\\\u003e/', $str, $match);
    echo $match[1]; // ray@xxx.com

// experiment 3:
    echo $from // Ray Lin

// experiment 4:
    echo htmlentities($from) // Ray Lin <ray@xxx.com>

// experiment 5:
    preg_match('/<(.*?)>/', $from, $match);
    $from =$match[1];
    echo $from  // ray@xxx.com

// experiment 6:
    $from = htmlentities($from);
    preg_match('/<(.*?)>/', $from, $match);
    print_r($match); // empty Array()

experiment 5 is ideal to my need, but you can see from experiment 3, $from was just two words, I don't even know where the email was from.