如何通过PHP调用LinkedIn API在个人主页发布带图片的帖子？

核心流程说明 #

发布带图片的LinkedIn帖子需要分三步完成：

• 先向LinkedIn注册图片上传，获取专属上传地址和媒体资产URN
• 将本地图片文件上传到指定地址
• 构造包含该媒体资产的帖子数据并发布

具体实现代码 #

1. 注册图片上传并获取上传凭证 #

// 注册上传的接口地址
$register_url = "https://api.linkedin.com/v2/assets?action=registerUpload";
$register_headers = [
    "Authorization: Bearer $access_token",
    "Content-Type: application/json",
];

// 构造注册上传的请求数据
$register_data = [
    "registerUploadRequest" => [
        "owner" => "urn:li:person:$person_urn",
        "recipes" => ["urn:li:digitalmediaRecipe:feedshare-image"],
        "serviceRelationships" => [
            [
                "relationshipType" => "OWNER",
                "identifier" => "urn:li:userGeneratedContent"
            ]
        ],
        "supportedUploadMechanism" => ["SYNCHRONOUS_UPLOAD"]
    ]
];

// 发送注册请求（假设你的publishPost函数支持POST请求）
$register_response = json_decode(publishPost($register_url, json_encode($register_data), $register_headers), true);
$upload_url = $register_response["value"]["uploadMechanism"]["com.linkedin.digitalmedia.uploading.MediaUploadHttpRequest"]["uploadUrl"];
$asset_urn = $register_response["value"]["asset"];

2. 上传图片到指定地址 #

// 读取本地图片文件
$image_path = "/path/to/your/image.jpg"; // 替换为实际图片路径
$image_content = file_get_contents($image_path);

// 设置上传请求头
$upload_headers = [
    "Authorization: Bearer $access_token",
    "Content-Type: image/jpeg", // 图片类型需匹配实际文件，如image/png
];

// 使用PUT方法上传图片（若你的publishPost不支持PUT，可改用cURL实现）
$upload_context = stream_context_create([
    "http" => [
        "method" => "PUT",
        "header" => implode("\r\n", $upload_headers),
        "content" => $image_content
    ]
]);
$upload_response = file_get_contents($upload_url, false, $upload_context);

3. 构造并发布带图片的帖子 #

$post_url = "https://api.linkedin.com/v2/ugcPosts";
$post_headers = [
    "Authorization: Bearer $access_token",
    "Content-Type: application/json",
];

$post_data = [
    "author" => "urn:li:person:$person_urn",
    "lifecycleState" => "PUBLISHED",
    "specificContent" => [
        "com.linkedin.ugc.ShareContent" => [
            "shareCommentary" => [
                "text" => "带图片的帖子内容...", // 替换为你的帖子文案
            ],
            "shareMediaCategory" => "IMAGE",
            "media" => [
                [
                    "status" => "READY",
                    "description" => [
                        "text" => "图片描述文字" // 可选：图片的描述内容
                    ],
                    "media" => $asset_urn,
                    "title" => [
                        "text" => "图片标题" // 可选：图片的标题
                    ]
                ]
            ]
        ],
    ],
    "visibility" => [
        "com.linkedin.ugc.MemberNetworkVisibility" => "PUBLIC",
    ],
];

$post_response = publishPost($post_url, json_encode($post_data), $post_headers);

注意事项 #

• 确保你的access token拥有w_member_social权限，这是发布带媒体内容帖子的必要权限
• 图片格式支持JPEG、PNG，文件大小不超过5MB，分辨率建议1200x628及以上（适配LinkedIn feed最佳展示比例）
• 若现有publishPost函数仅支持POST请求，需修改函数逻辑以支持PUT请求（推荐使用cURL实现更灵活的HTTP请求处理）

内容的提问来源于stack exchange，提问作者MSS LLP