如何根据标题参数动态更改文件名-nginx 重写

如何根据标题参数动态更改文件名-nginx 重写

我正在.pdf使用 nginx 网络服务器提供文件服务。并且.pdf根据情况使用重写规则设置文件的文件名title args

我想做的是example.com在文件名中添加我的域名

1. 如果其中title包含 var ,则使用var 数据作为文件名。example.comtitle

例如

URL : http://example.com/pdf/0D2E8C9DC2F732A6ACC6150811515F697E3C376C.pdf?title=[example.com]ebook
Filename : [example.com]ebook.pdf

2. 如果titlevar 不包含example.com,则将文件名设为[example.com]title var.pdf

例如

URL : http://example.com/pdf/0D2E8C9DC2F732A6ACC6150811515F697E3C376C.pdf?title=ebook
Filename : [example.com]ebook.pdf

3. 如果未设置标题,则使用文件名作为[example.com]hash.pdf文件名。

例如

URL : http://example.com/pdf/0D2E8C9DC2F732A6ACC6150811515F697E3C376C.pdf
Filename : [example.com]0D2E8C9DC2F732A6ACC6150811515F697E3C376C.pdf

我怎样才能实现这样的目标?


我当前的配置如下

#pdf download block
location ~* /pdf/([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F]+)\.pdf$ {

#if title is not set then use hash.pdf as filename
if ( $arg_title  = '' ) {
    add_header Content-Disposition 'attachment; filename="[example.com]$1$2$3$4$5$6.pdf"';
}

add_header Content-Disposition 'attachment; filename="[example.com]$arg_title.pdf"';
alias   /var/www/example.com/pdf/$1/$2/$3/$4/$5/$1$2$3$4$5$6.pdf;
expires 1y;
}

上述代码仅在未设置 title var 时才能正常工作,但如果我设置 title var,[example.com]ebook.pdf它会再次添加域名,最终文件名将变为

[example.com][example.com]ebook.pdf 

答案1

据我所知,我们可以假设,如果[example.com]变量开头有一个子字符串$arg_title,我们可以安全地将其删除。所以这是您需要的配置:

location ~* /pdf/([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F]+)\.pdf$ {

 #First of all we should put pdf path from the request into a variable,
 #since $1,$2,$n would contain other data later:
set $hashpath $1/$2/$3/$4/$5/$1$2$3$4$5$6;

 #Same applies to hash title:
set $hashtitle $1$2$3$4$5$6;

 #Now we try to get the title argument without getting [example.com] in the beginning:
if ( $arg_title ~ "^(\[example\.com\])?(.*)$")
{
   #This way if title contained [example.com], it would go to $1 variable, while $2 has our new cleaned title:
  set $pdftitle $2;
}

 #now we check if title was empty:
if ( $arg_title  = '' ) {
 #and assign our title that $hashtitle variable we got from the request earlier:
    set $pdftitle $hashtitle;
}

 #also we check if title has only [example.com] without anything else:
if ( $arg_title  = '[example.com]' ) {
    set $pdftitle $hashtitle;
}

 #After that we can safely put [example.com] in front of our filename, without worrying that there would be a double:
add_header Content-Disposition 'attachment; filename="[example.com]$pdftitle.pdf"';

alias /var/www/example.com/pdf/$hashpath.pdf;
expires 1y;
}

与 nginx 1.9.12 配合良好:

title=[example.com]测试

标题=just_test

未设置标题

实际文件位于这里

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