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NGINX：当请求方法是 OPTIONS 且文件存在时返回 CORS 标头，否则传递给 PHP-FPM

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NGINX：当请求方法是 OPTIONS 且文件存在时返回 CORS 标头，否则传递给 PHP-FPM

我有一个 NGINX，其背后有一个 PHP-FPM 实例。OPTIONS文件系统中存在文件的路径请求应该由 NGINX 处理。对于这些请求，NGINX 应该返回Access-Control-*CORS 标头。OPTIONS不存在文件的请求应该传递给 PHP-FPM。

逻辑应该是这样的：

    location / {
        # In this case: Check if file exists
        # - yes: return CORS headers
        # - no: pass request to PHP-FPM
        if ($request_method = 'OPTIONS') {
            # This causes an error
            try_files @cors;
        }

        # Normal request handling for all non-OPTIONS requests:

        # Try to serve file directly, fallback to index.php if file does not exist
        try_files $uri /index.php$is_args$args;
    }

    location @cors {
        if (-f $request_filename) {
            more_set_headers "Access-Control-Allow-Credentials: true";
            more_set_headers "Access-Control-Allow-Origin: example.com";
            more_set_headers 'Access-Control-Allow-Methods: POST, GET, DELETE, PUT, OPTIONS';
            more_set_headers 'Access-Control-Allow-Headers: content-type,ngsw-bypass';
            more_set_headers 'Access-Control-Max-Age: 3600';

            more_set_headers 'Content-Type: text/plain; charset=UTF-8';
            more_set_headers 'Content-Length: 0';

            return 204;
        }

        try_files /index.php$is_args$args;
    }

    location ~ ^/index\.php(/|$) {
        fastcgi_pass localhost:9000;
        fastcgi_split_path_info ^(.+\.php)(/.*)$;
        include fastcgi_params;

        fastcgi_param REQUEST_METHOD $request_method;
        fastcgi_param SCRIPT_FILENAME /var/www/public/index.php;
        fastcgi_param DOCUMENT_ROOT /var/www/public;
        fastcgi_param HTTPS $fastcgi_param_https;

        # Prevents URIs that include the front controller. This will 404:
        # http://domain.tld/index.php/some-path
        # Remove the internal directive to allow URIs like this
        internal;
    }

但这并不适用。因为语句try_files中不允许使用if([emerg] 1#1: 此处不允许使用“try_files”指令)。

答案1

您可以使用该error_page指令来处理文件系统中存在文件路径的 OPTIONS 请求。

location / {
    # Try to serve file directly, fallback to index.php if file does not exist
    try_files $uri /index.php$is_args$args;

    # Handle OPTIONS requests for paths for which a file exists in the file system
    if ($request_method = 'OPTIONS') {
        if (-f $request_filename) {
            add_header 'Access-Control-Allow-Origin' '*';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Type' 'text/plain; charset=utf-8';
            add_header 'Content-Length' 0;
            return 204;
        }
    }
}

# Pass all other requests to PHP-FPM
location ~ \.php$ {
    fastcgi_pass unix:/run/php/php7.4-fpm.sock;
    fastcgi_index index.php;
    include fastcgi_params;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
}

该try_files指令用于直接提供文件，index.php如果文件不存在则回退。该if块检查请求方法是否为 OPTIONS 以及请求的路径中是否存在文件。如果两个条件都为真，NGINX 将在响应中添加必要的 CORS 标头并返回 204 No Content 状态代码。

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