用URL重写卡在htaccess的使用Apache：1规则来统治他们 [英] Stuck with URL-rewriting in htaccess with Apache: 1 Rule to Rule them all

问题描述

审视自己当前的URL重写加载图片：

examine my current url rewrites for loading pictures:

// Possibiities: 1 letter char, followed by `=` then the value (numbers/letters)
// w= | h= | c= | q= | f=

IMG-bla/blue_w100.jpg           >>  imgcpu?src=bla/blue.jpg&w=100
IMG-bla/blue_cp.jpg             >>  imgcpu?src=bla/blue.jpg&c=p
IMG-bla/blue_h200.jpg           >>  imgcpu?src=bla/blue.jpg&h=200
IMG-bla/blue_w50_h200_fbw.jpg   >>  imgcpu?src=bla/blue.jpg&w=50&h=200&f=bw 

基本上我想有1终极重写URL，这给了我自由改写下面的网址与任何财产，而不必硬code重写，每个可能性一个规则的，准确的顺序：目前我code是非常愚蠢的，inpractical＆安培;它不完全unelegant，思想确实工作！

Essentially I would like to have 1 Ultimate rewrite url, that gives me the freedom to rewrite the below urls with any property, without having to hardcode that exact sequence of rewriting, with one rule per possibility: currently my code is very stupid, inpractical & incomplete its unelegant, thought does work!

// works but utterly unelegant and unpractical as well as incomplete:
RewriteRule ^IMG-(.+)_w(.+).jpg$ imgcpu\.php\?src=$1\.jpg&w=$2 [L]
RewriteRule ^IMG-(.+)_w(.+)_h(.+)_c(.+).jpg$ imgcpu\.php\?src=$1\.jpg&w=$2&h=$3&c=$4 [L]
RewriteRule ^IMG-(.+)_w(.+)_h(.+)_f(.+).jpg$ imgcpu\.php\?src=$1\.jpg&w=$2&h=$3&f=$4 [L]

现在，我怎么能重写这个复杂的规则与可选的物业资产？我在寻找为1规则来统治他们。你的想法和放大器;建议热烈欢迎和我美味给予好评任何敢于来解决这个复杂的难题！

Now, how can I rewrite this complex rule with the optional property assets? I am in search for that 1 Rule to Rule them all. Your ideas & suggestions are warmly welcome and I deliciously upvote anything that dares to solve this complex puzzle!

推荐答案

我实现这个非常普遍的解决方案之前，思考的方法。在这里，我已经重复了同样的规则几次。这是一种分而治之的策略，其中每个执行规则时，它提取一个参数。

I pondered several methods before reaching this very general solution. Here, I have repeated the same rule several times. It's a sort of divide and conquer strategy where each time the rule is executed, it extracts one parameter.

# Generic rule for extracting one parameter

RewriteRule ^(IMG-[a-z0-9]+/[a-z0-9]+)_([a-z0-9])([a-z0-9]+)([_.].*)$ $1$4?$2=$3 [NC,QSA]
RewriteRule ^(IMG-[a-z0-9]+/[a-z0-9]+)_([a-z0-9])([a-z0-9]+)([_.].*)$ $1$4?$2=$3 [NC,QSA]
RewriteRule ^(IMG-[a-z0-9]+/[a-z0-9]+)_([a-z0-9])([a-z0-9]+)([_.].*)$ $1$4?$2=$3 [NC,QSA]
RewriteRule ^(IMG-[a-z0-9]+/[a-z0-9]+)_([a-z0-9])([a-z0-9]+)([_.].*)$ $1$4?$2=$3 [NC,QSA]
RewriteRule ^(IMG-[a-z0-9]+/[a-z0-9]+)_([a-z0-9])([a-z0-9]+)([_.].*)$ $1$4?$2=$3 [NC,QSA]
RewriteRule ^(IMG-[a-z0-9]+/[a-z0-9]+)_([a-z0-9])([a-z0-9]+)([_.].*)$ $1$4?$2=$3 [NC,QSA]
RewriteRule ^(IMG-[a-z0-9]+/[a-z0-9]+)_([a-z0-9])([a-z0-9]+)([_.].*)$ $1$4?$2=$3 [NC,QSA]
RewriteRule ^(IMG-[a-z0-9]+/[a-z0-9]+)_([a-z0-9])([a-z0-9]+)([_.].*)$ $1$4?$2=$3 [NC,QSA]

# Final rule which does the actual rewrite 
RewriteRule IMG-([a-z0-9]+/[a-z0-9]+\.jpg) /test/index.php?src=$1 [QSA]

让我们打破了D＆放大器;！C规则，成较小的部分。

Let's break the D&C rule into smaller parts!

^（IMG- [A-Z0-9] + / [A-Z0-9] +）这部分是匹配的，但preserved。这是$ 1的结果。

^(IMG-[a-z0-9]+/[a-z0-9]+) This part is matched but preserved. This is $1 in the result.

_ A单下划线。这是匹配的，而是被忽略。

_ A single underscore. This is matched but discarded.

（[A-Z0-9]）匹配单个字母或数字（显然undorscore以下）。这为$ 2和被假定为参数名称

([a-z0-9]) matches a single letter or number (obviously following the undorscore). This is $2 and is assumed to be the parameter name.

（[A-Z0-9] +）匹配一个或多个字母或数字。这为$ 3中的结果，并假定为参数值。

([a-z0-9]+) matches one or more letters or numbers. This is $3 in the result and is assumed to be the parameter value.

（[_]。*）$ 单下划线或时期，和其他一切多达请求字符串的结尾相匹配。这是$ 4

([_.].*)$ matches a single underscore or period, and everything else up to the end of the request string. This is $4.

因此​​，对于每一个步骤，一个参数的提取（如果有一场比赛，那是），然后追加到查询字符串QSA的帮助。请求的其余部分，$ 1 $ 4捆绑在一起，并提出准备另一轮。冲洗和重复，直到我们出的参数或达到规定的最大数量的可用。

So for every step, one parameter is extracted (if there was a match, that is) which is then appended to the query string with the help of QSA. The rest of the request, $1$4 is bundled together and made ready for another round. Rinse and repeat until we're out of parameters or reach the maximum number of rules available.

最后的规则匹配什么应该是由当时的路径和文件名。
这些步骤如下：

The final rule matches what should be a path and filename by then. These are the steps:

IMG-bla/blue_w50_h200_fbw.jpg -> IMG-bla/blue_h200_fbw.jpg?w=50 [with QSA]
IMG-bla/blue_h200_fbw.jpg     -> IMG-bla/blue_fbw.jpg?h=200     [with QSA]
IMG-bla/blue_fbw.jpg          -> IMG-bla/blue.jpg?f=bw          [with QSA]

（没有更通用的规则将匹配）

(no more generic rules will match)

IMG-bla/blue.jpg              -> /test/index.php?src=bla/blue.jpg [with QSA]

总计的查询字符串被追加后：

Grand total after the query strings are appended:

/test/index.php?src=bla/blue.jpg&f=bw&h=200&w=50

请注意，我正在做一些假设...

Note that I'm making a few assumptions...

• 一切（除了下划线，目录斜杠和周期）是一个字母或数字。可能是过于严格的你，如果文件或参数可能包含国际字符。


• 参数名称始终是一个字符长，但不必明确列出。


• 图片永远不会超过一个子文件夹深（容易修复。）

告诉我你的想法。

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