使用Curl调用FCM V1 API向主题发通知时出现400错误

错误信息 #

"code": 400,
"message": "Invalid JSON payload received. Unknown name "to": Cannot find field."

问题原因 #

你使用的是FCM v1版本API，但请求Payload里沿用了旧版Legacy API的to字段指定主题。FCM v1 API中，指定主题目标需使用topic字段，而非to。

修改后的代码 #

public function sendTopic($topic,$title,$body, $data , $type, $image='')
{ 
    $client = new Client();
    
    $url = 'https://fcm.googleapis.com/v1/projects/wooloveapp-dda64/messages:send';
   
    $fields = 
    [
        'message' =>  
        [
            // 将原"to"字段替换为v1 API要求的"topic"字段
            "topic" => $topic,
            "notification" =>
            [
                "title" => $title,
                "body" => $body,
            ],
            "data" =>   [ "data" =>  json_encode($data) ],
            "android" =>
            [
                "notification" => 
                [
                    "sound" => "default",
                    "title" => $title,
                    "body" => $body,
                    'tag' => $topic,
                    "channel_id" => "500",
                    
                ], 
                "priority" => "high",
                "ttl" => "86400s"
                //"badge" => 1
            ],
            "apns" =>
            [
                "payload" => 
                [
                    "aps" => [ "sound" => "default" ]
                ],
                "headers" => [
                    "apns-priority" => "5",
                    "content_available" => "1"
                ], 
            ],
            "webpush"=>[
                "headers"=>[
                  "Urgency"=> "high",
                  //"image" => "https://wooloveapp.com/img/misc/logo-02.jpg"
                ]
                ],
        ]
    ];

    $headers = 
    [
        'Authorization: Bearer ' .$this->getGoogleAccessToken(),
        'Accept:application/json',
        'Content-Type:application/json',
    ];

    // 移除手动设置的Content-Length，curl会自动计算处理，避免编码误差导致请求失败
    // 'Content-Length:'.strlen(json_encode($fields)),

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));

    $result = curl_exec($ch);

    $result =
    [
        'result' => $result,
        //'statusCode' => $statusCode
    ];

    return $result;
}

额外说明 #

• 若需实现多主题组合的目标筛选，可使用condition字段，格式示例："'topic1' in topics && 'topic2' in topics"
• 手动设置Content-Length容易因字符编码、转义等问题出现计算误差，交由curl自动处理更可靠

内容的提问来源于stack exchange，提问作者gabogabans