检查有效的gravatar（PHP）

Question

我很新的PHP，所以如果你有任何想法或建议，指向我在正确的方向，我会很感激。

试图做一个简单的函数来检查用户的电子邮件地址是否转换为有效的Gravatar图像，但似乎gravatar.com已更改其标题。

使用get_headers('urlencoded_bad_email@example.com')回报的200，而不是302

下面是一个糟糕的gravatar图像，其中没有似乎能够帮助，因为他们是相同的一个有效的gravatar形象标题：

array(13) { 
    [0]=> 
    string(15) "HTTP/1.1 200 OK" 
    [1]=> 
    string(13) "Server: nginx" 
    [2]=> 
    string(35) "Date: Sun, 26 Jul 2009 20:22:07 GMT" 
    [3]=> 
    string(24) "Content-Type: image/jpeg" 
    [4]=> 
    string(17) "Connection: close" 
    [5]=> 
    string(44) "Last-Modified: Sun, 26 Jul 2009 19:47:12 GMT" 
    [6]=> 
    string(76) "Content-Disposition: inline; filename="5ed352b75af7175464e354f6651c6e9e.jpg"" 
    [7]=> 
    string(20) "Content-Length: 3875" 
    [8]=> 
    string(32) "X-Varnish: 3883194649 3880834433" 
    [9]=> 
    string(16) "Via: 1.1 varnish" 
    [10]=> 
    string(38) "Expires: Sun, 26 Jul 2009 20:27:07 GMT" 
    [11]=> 
    string(26) "Cache-Control: max-age=300" 
    [12]=> 
    string(16) "Source-Age: 1322" 
} 

ps我知道'&d'参数，但它不会达到我的目的。 :)

编辑：

使用'?d'而不是'&d'。必须是gravatar.com'thang。

Answer 1

注意：在写作的时候，这是唯一的选择。但是，一些后来的时间?d=404被添加，使得Andrew's answer更清洁。

---

虽然你说你知道的d parameter，你知道它实际上返回一个重定向头时是否适用？因此，下面yields 302发现，由于分身不存在：

http://www.gravatar.com/avatar/3b3be63a4c2a439b013787725dfce802?d=http%3A%2F%2Fwww.google.com%2Fimages%2Flogo.gif

HTTP/1.1 302 Found 
... 
Last-Modified: Wed, 11 Jan 1984 08:00:00 GMT 
Location: http://www.google.com/images/logo.gif 
Content-Length: 0 
... 
Expires: Sun, 26 Jul 2009 23:18:33 GMT 
Cache-Control: max-age=300 

在我看来，所有你需要做的就是添加d参数和检查HTTP结果代码即可。

Answer 2

我建议你试试LucasAraújo的php gravatar class。

/** 
* Class Gravatar 
* 
* From Gravatar Help: 
*  "A gravatar is a dynamic image resource that is requested from our server. The request 
*  URL is presented here, broken into its segments." 
* Source: 
* http://site.gravatar.com/site/implement 
* 
* Usage: 
* <code> 
*  $email = "youremail@yourhost.com"; 
*  $default = "http://www.yourhost.com/default_image.jpg"; // Optional 
*  $gravatar = new Gravatar($email, $default); 
*  $gravatar->size = 80; 
*  $gravatar->rating = "G"; 
*  $gravatar->border = "FF0000"; 
* 
*  echo $gravatar; // Or echo $gravatar->toHTML(); 
* </code> 
* 
* Class Page: http://www.phpclasses.org/browse/package/4227.html 
* 
* @author Lucas Araújo <araujo.lucas@gmail.com> 
* @version 1.0 
* @package Gravatar 
*/ 
class Gravatar 
{ 
    /** 
    * Gravatar's url 
    */ 
    const GRAVATAR_URL = "http://www.gravatar.com/avatar.php"; 

    /** 
    * Ratings available 
    */ 
    private $GRAVATAR_RATING = array("G", "PG", "R", "X"); 

    /** 
    * Query string. key/value 
    */ 
    protected $properties = array(
     "gravatar_id" => NULL, 
     "default"  => NULL, 
     "size"   => 80,  // The default value 
     "rating"  => NULL, 
     "border"  => NULL, 
    ); 

    /** 
    * E-mail. This will be converted to md5($email) 
    */ 
    protected $email = ""; 

    /** 
    * Extra attributes to the IMG tag like ALT, CLASS, STYLE... 
    */ 
    protected $extra = ""; 

    /** 
    *  
    */ 
    public function __construct($email=NULL, $default=NULL) { 
     $this->setEmail($email); 
     $this->setDefault($default); 
    } 

    /** 
    *  
    */ 
    public function setEmail($email) { 
     if ($this->isValidEmail($email)) { 
      $this->email = $email; 
      $this->properties['gravatar_id'] = md5(strtolower($this->email)); 
      return true; 
     } 
     return false; 
    } 

    /** 
    *  
    */ 
    public function setDefault($default) { 
     $this->properties['default'] = $default; 
    } 

    /** 
    *  
    */ 
    public function setRating($rating) { 
     if (in_array($rating, $this->GRAVATAR_RATING)) { 
      $this->properties['rating'] = $rating; 
      return true; 
     } 
     return false; 
    } 

    /** 
    *  
    */ 
    public function setSize($size) { 
     $size = (int) $size; 
     if ($size <= 0) 
      $size = NULL;  // Use the default size 
     $this->properties['size'] = $size; 
    } 

    /** 
    *  
    */ 
    public function setExtra($extra) { 
     $this->extra = $extra; 
    } 

    /** 
    *  
    */ 
    public function isValidEmail($email) { 
     // Source: http://www.zend.com/zend/spotlight/ev12apr.php 
     return eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $email); 
    } 

    /** 
    * Object property overloading 
    */ 
    public function __get($var) { return @$this->properties[$var]; } 

    /** 
    * Object property overloading 
    */ 
    public function __set($var, $value) { 
     switch($var) { 
      case "email": return $this->setEmail($value); 
      case "rating": return $this->setRating($value); 
      case "default": return $this->setDefault($value); 
      case "size": return $this->setSize($value); 
      // Cannot set gravatar_id 
      case "gravatar_id": return; 
     } 
     return @$this->properties[$var] = $value; 
    } 

    /** 
    * Object property overloading 
    */ 
    public function __isset($var) { return isset($this->properties[$var]); } 

    /** 
    * Object property overloading 
    */ 
    public function __unset($var) { return @$this->properties[$var] == NULL; } 

    /** 
    * Get source 
    */ 
    public function getSrc() { 
     $url = self::GRAVATAR_URL ."?"; 
     $first = true; 
     foreach($this->properties as $key => $value) { 
      if (isset($value)) { 
       if (!$first) 
        $url .= "&"; 
       $url .= $key."=".urlencode($value); 
       $first = false; 
      } 
     } 
     return $url;  
    } 

    /** 
    * toHTML 
    */ 
    public function toHTML() { 
     return  '<img src="'. $this->getSrc() .'"' 
       .(!isset($this->size) ? "" : ' width="'.$this->size.'" height="'.$this->size.'"') 
       .$this->extra 
       .' />';  
    } 

    /** 
    * toString 
    */ 
    public function __toString() { return $this->toHTML(); } 
} 

，这是你如何使用它：

include 'gravatar.php'; 
$eMail = 'name@email.net'; 
$defImg = 'http://www.example.com/images/myphoto.jpg'; 
$avatar = new Gravatar($eMail, $defImg); 
$avatar->setSize(90); 
$avatar->setRating('G'); 
$avatar->setExtra('alt="my gravatar"'); 

<p> 
<?php echo $avatar->toHTML(); ?> 
</p> 

Answer 3

是文件名（内容处置：内联;文件名= “5ed352b75af7175464e354f6651c6e9e.jpg”）为 “没有找到/无效” 一致Gravatar图像？如果是这样，你可以用它来识别无效图像？

Answer 4

一个真正unperformant解决办法是张贴email到http://en.gravatar.com/accounts/signup和检查Sorry, that email address is already used! ...

编辑

好了，他们用一些饼干来表示，如果发生错误或不... ;-)

function isUsed($email) 
{ 
    $url = 'http://en.gravatar.com/accounts/signup'; 
    $email = strtolower($email); 

    $ch = curl_init($url); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); 
    curl_setopt($ch, CURLOPT_POST, true); 
    curl_setopt($ch, CURLOPT_POSTFIELDS, 'commit=Signup&email=' . urlencode($email)); 
    curl_setopt($ch, CURLOPT_HEADER, true); 
    $response = curl_exec($ch); 
    curl_close($ch); 

    return (false !== strpos($response, 'Set-Cookie: gravatar-notices')); 
} 

var_dump(isUsed('test@example.org')); 

Answer 5

不知道你到底怎么想，一旦你得到它使用此信息...但是你能不能：

将图像加载到网页上，并附加了onload或onerror处理程序...如果onload激发，则您匹配，如果onerror激发它或者不存在（或者存在加载问题）

eg

<img 
    src="http://www.gravatar.com/avatar/282eed17fcb9682bb2816697482b64ec?s=128&d=identicon&r=PG" 
    onload="itWorked();" 
    onerror="itFailed();"/> 

Answer 6

检查gravatar时，将“default”参数添加到图片url，如果找不到图片，这将提供302重定向。

$grav_url = 'http://www.gravatar.com/avatar/'.md5(mb_strtolower($email)).'?default=http://www.mysite.com/null.jpg&size=310'; 

空图像可随后返回404，如果你希望它:)

Answer 7

的Gravatar增加了一个选项，以“d”参数，这意味着if you pass in d=404，你会得到一个404页（而不是一些302重定向到默认图片），如果没有图片，而不必使用启发式。

Answer 8

扩展由安德鲁·艾利特约d = 404答案，实际上有可能组成一个查询的gravatar与d=404（或default=404），然后看看标题，如果关键[0]包含一个值或。

$email = md5(strtolower("myemailaddress@example.com")); 
$gravatar = "http://www.gravatar.com/avatar/$email?d=404"; 
$headers = get_headers($gravatar,1); 
if (strpos($headers[0],'200')) echo "<img src='$gravatar'>"; // OK 
else if (strpos($headers[0],'404')) echo "No Gravatar"; // Not Found 

原始问题可以追溯到三年前。也许在那个时候Gravatar的头文件有些不同。