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Te rahi o nga whakaahua i runga i te rere

I roto i te nuinga o nga tono tukutuku e whakamahi ana i nga whakaahua, me hanga he kape iti o enei whakaahua, a he maha nga whakatakotoranga mo etahi atu whakaahua.
Ko te taapiri i nga waahanga hou ki te tono o naianei ka raru ano te upoko. No reira te mahi:

Whāinga

Me tohu tatou i te rarangi o nga whakaritenga:

  • Hangaia etahi atu whakaahua o tetahi whakatakotoranga i runga i te rere me te kore e whakauru i etahi atu mahi ki roto i te tono i nga wa katoa e noho ana te tono;
  • Ko nga whakaahua taapiri kaore e hiahiatia kia hangaia mo ia tono;
  • Monokia te kaha ki te whakaputa whakaahua taapiri o nga whakatakotoranga kore i tohua.

Ka whakamaramatia e au te korero whakamutunga, na te mea he paku whakahē ki te take tuatahi. Mena ka whakatuwherahia e matou te reanga o etahi whakaahua, katahi ka tupono ka whakaekea te waahi ma te whakaputa i te maha o nga tono ki te whakarereke i te ahua ki te maha o nga whakatakotoranga, na reira me kati tenei whakaraeraetanga.

whirihoranga whakaurunga nginx

Hei whakaoti i nga whakaritenga o runga ake nei ka hiahia matou ki nga huinga nginx e whai ake nei:

Ngā kōwae ngx_http_image_filter_module и ngx_http_secure_link_module kaore i te whakauruhia ma te taunoa, no reira me tohu i te waahanga whirihoranga nginx:

phoinix@phoinix-work:~/src/nginx-0.8.29
$ ./configure --with-http_secure_link_module --with-http_image_filter_module

whirihoranga nginx

Ka taapirihia he mea hou ki ta maatau whirihoranga kaihautu tauwāhi me nga tawhā keteroki whānui:

...
    proxy_cache_path /www/myprojects/cache levels=1:2 keys_zone=image-preview:10m;
...
    server {
...
        location ~ ^/preview/([cir])/(.+) {
        # Тип операции
            set                         $oper $1;
        # Параметры изображения и путь к файлу
            set                         $remn $2;
        # Проксируем на отдельный хост
            proxy_pass                  http://myproject.ru:81/$oper/$remn;
            proxy_intercept_errors      on;
            error_page                  404 = /preview/404;
        # Кеширование
            proxy_cache                 image-preview;
            proxy_cache_key             "$host$document_uri";
        # 200 ответы кешируем на 1 день
            proxy_cache_valid           200 1d;
        # остальные ответы кешируем на 1 минуту
            proxy_cache_valid           any 1m;
        }
        
        # Возвращаем ошибку
        location = /preview/404 {
            internal;
            default_type                image/gif;
            alias                       /www/myprojects/image/noimage.gif;
        }
...
    }
...

Ka taapirihia he kaihautu hou ki te whirihora:

server {
    server_name                     myproject.ru;
    listen                          81;

    access_log                      /www/myproject.ru/logs/nginx.preview.access_log;
    error_log                       /www/myproject.ru/logs/nginx.preview.error_log info;

    # Указываем секретное слово для md5
    secure_link_secret              secret;

    # Ошибки отправляем она отдельный location
    error_page                      403 404 415 500 502 503 504 = @404;

    # location Для фильтра size
    location ~ ^/i/[^/]+/(.+) {
        
        # грязный хак от Игоря Сысоева *
        alias                       /www/myproject.ru/images/$1;
        try_files                   "" @404;
    
        # Проверяем правильность ссылки и md5
        if ($secure_link = "") { return 404; }
        
        # Используем соответсвующий фильтр
        image_filter                size;
    }

    # По аналогии остальные location для других фильтров
    location ~ ^/c/[^/]+/(d+|-)x(d+|-)/(.+) {
        set                         $width  $1;
        set                         $height $2;
        
        alias                       /www/myproject.ru/images/$3;
        try_files                   "" @404;
    
        if ($secure_link = "") { return 404; }
    
        image_filter                crop  $width  $height;
    }
    
    location ~ ^/r/[^/]+/(d+|-)x(d+|-)/(.+) {
        set                         $width  $1;
        set                         $height $2;

        alias                       /www/myproject.ru/images/$3;
        try_files                   "" @404;

        if ($secure_link = "") { return 404; }

        image_filter                resize  $width  $height;
    }

    location @404 { return 404; }
}

Ko te mutunga, ka taea te tiki pikitia taapiri ma te whakamahi i nga hononga e whai ake nei:

* try_files — tairongo ki te mokowhiti me te pūāhua Russian, na i ahau ki te hanga i te tootoo ki ingoakē.

Whakamahia i roto i te tono tukutuku

I te taumata tono tukutuku, ka taea e koe te mahi i nga tikanga e whai ake nei (Perl):

sub proxy_image {
    use Digest::MD5     qw /md5_hex/;
    my %params = @_;
    my $filter = {
                    size    => 'i',
                    resize  => 'r',
                    crop    => 'c'            
                  }->{$params{filter}} || 'r';
    my $path = ($filter ne 'i' ?
                    ( $params{height} || '_' ) . 'x' . ( $params{width} || '_' ) . '/' :
                    ()
               ) . $params{source};
    my $md5 = md5_hex( $path . 'secret' );
    $path = '/preview/' . $filter . '/' . $md5 . '/' . $path;
    return $path;
}

my $preview_path = &proxy_image(
                    source  => 'image1.jpg',
                    height  => 100,
                    width   => 100,
                    filter  => 'resize'
                );

Ahakoa ka tūtohu ano ahau ki te tatau i nga rahi arokite.

Rake

I te whakakore i te ahua taketake, ko nga arokite, ko te tikanga, kaore e mukua mai i te keteroki tae noa ki te whakakore i te keteroki, a, i roto i to maatau, ka taea e nga arokite te noho mo te ra i muri i te whakakorenga, engari koinei te waa morahi.

te mea taketake

Source: will.com

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