今天本来在写一个接口,上传图片,然后保存,数据库中记住路径,这样的一个任务

捣鼓了半天,上传图片代码写好了

- (void)uploadFile {
    NSString *path = @"/Users/apple/Desktop/acc.png";

    NSString *urlStr = @"http://www.cry.com/uploadFile.php";

    NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:urlStr parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {

        NSError *error;
        [formData appendPartWithFileURL:[NSURL fileURLWithPath:path] name:@"file" fileName:@"acc.png" mimeType:@"image/png" error:&error];
        NSLog(@"%@",error);

    } error:nil];

    AFHTTPSessionManager *manager = [[AFHTTPSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];

    NSURLSessionUploadTask *task = [manager uploadTaskWithStreamedRequest:request progress:^(NSProgress * _Nonnull uploadProgress) {

        NSLog(@"%@",uploadProgress);
    } completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {

        NSLog(@"response: %@",response);
        NSLog(@"responseobj: %@",responseObject);
        NSLog(@"%@",responseObject[@"status"]);
        NSLog(@"error: %@",error);

    }];
    [task resume];

}

虚拟机服务器的php代码也写了(简陋的代码),只是想试试传图片的流程

<?php
header("Content-Type:application/json");
/** * Created by PhpStorm. * User: apple * Date: 16/11/10 * Time: 上午9:45 */
$tmpfilename = $_FILES['file']['tmp_name'];
$name = $_FILES['file']['name'];
$path = "images/$name";
$json_arr ['newPath'] = $path;
if (is_uploaded_file($tmpfilename)) {               
$json_arr["isULfile"] = "是上传文件";
} else {    
$json_arr["isULfile"] = "不是上传文件";
}
$isSucc = move_uploaded_file($tmpfilename,$path);
if ($isSucc) {    $json_arr["status"] = "上传成功";
} else {   
 $json_arr["status"] = "上传失败";  
  $json_arr["desc"] = $isSucc;
}
$json_arr += $_FILES;
echo json_encode($json_arr,JSON_PRETTY_PRINT);
?>

然而,后台服务器接受到了图片,临时文件已经有了

每次给我输出的都是

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo}span.s1 {font-variant-ligatures: no-common-ligatures}

responseobj: {
    file =     {
       error = 0;
       name = "acc.png";
       size = 707;
        "tmp_name" = "/tmp/phpw095q1";
        type = "image/png";
    };
    isULfile = "是上传文件";(php里的is_uploaded_file()函数)
    newPath = "/var/www/cry.com/images/acc.png";(写入的路径)
    status = "U4e0aU4f20U6210U529f";
}
2016-11-10 19:41:10.289 OC32[89155:5771018] 上传失败

status里的那串就是”上传失败”

然后我登入虚拟机,查看日志/var/log/httpd/error_log,因为PHP就是以模块的形式集成在Apache上运行的,日志在httpd里(apache就是httpd)

Thu Nov 10 18:17:16.452810 2016] [:error] [pid 6019] [client 192.168.1.219:61588] PHP Warning:  move_uploaded_file(/var/www/cry.com/images/acc.png): failed to open stream: Permission denied in /var/www/cry.com/uploadFile.php on line 21
Thu Nov 10 18:17:16.498295 2016] [:error] [pid 6019] [client 192.168.1.219:61588] PHP Warning:  move_uploaded_file(): Unable to move '/tmp/phpj5KtFB' to '/var/www/cry.com/images/acc.png' in /var/www/cry.com/uploadFile.php on line 21

???Permission denied???,这是没权限的意思吗

查看了很多,什么chown修改,chmod 777修改,各种权限,都还是上传失败.

最后发现是SELinux在搞鬼

SELinux 更能遵从最小权限的理念。在缺省的 enforcing 情况下，一切均被拒绝，接着有一系列例外的政策来允许系统的每个元素（服务、程序、用户）运作时所需的访问权。当一项服务、程序或用户尝试访问或修改一个它不须用的文件或资源时，它的请求会遭拒绝，而这个行动会被记录下来

所以,我们可以在/etc/selinux/config修改SELinux配置,关掉它

但是,肯定还有别的方法

看到有段文字说所有进程及文件都拥有一个 SELinux 的安全性脉络,可以用ls -Z查看

-rwxr-xr-x. apache apache system_u:object_r:httpd_sys_content_t:s0 uploadFile.php
-rw-r--r--. apache apache unconfined_u:object_r:httpd_sys_content_t:s0 images

httpd_sys_content_t 这是apache的权限角色

在这篇文章里https://blog.lysender.com/2015/07/centos-7-selinux-php-apache-cannot-writeaccess-file-no-matter-what/ 看到

虽然英文一般,但是看到了关键字wirete to those path

http://newscentral.exsees.com/item/5b6cccab6ed05ce053bc09f70dc9386e-99c0b81ebd43e7b6848a00939f39b855 里面博主说

 sudo  chcon -R -t httpd_sys_rw_content_t  /var/www/cry.com/images

把我准备写入的文件夹的权限角色从httpd_sys_content_t
改成httpd_sys_rw_content_t

run~

就这样,看起来好像解决了

参考:
http://newscentral.exsees.com/item/5b6cccab6ed05ce053bc09f70dc9386e-99c0b81ebd43e7b6848a00939f39b855

https://blog.lysender.com/2015/07/centos-7-selinux-php-apache-cannot-writeaccess-file-no-matter-what/

有更好的方法,可以留言~