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tfs128's avatar
tfs128
Icon for Nimbostratus rankNimbostratus
Jun 09, 2020

URI rewrite with wildcard

Working on setting up an irule and have been using this post for reference.

 

Request will be coming in as https://site.domain.com/text1/text2/text3/wildcard/text4, where the wildcard can be any app name and the other values are constant.

 

Then we need to rewrite the uri to be /text5/text6/text7/wildcard/text4. We'll be keeping the "/wildcard/text4" part of the uri but the rest will be changing. So the request will look like https://site.domain.com/text5/text6/text7/wildcard/text4

Then send it to a different pool.

 

Have come up the following, though the skip_count was confusing me a bit. I assume I don't want any characters to be skipped when pulling in the wildcard value. I saw that regex is discouraged due to cpu, so not sure if there's a better way to accomplish this.

 

when HTTP_REQUEST {

  if { [string tolower [HTTP::uri]] matches_regex "(\/text1\/text2\/text3).*(\/text4)" } {

    set filter [findstr [string tolower [HTTP::uri]] "/text1/text2/text3/" 0 "/text4"]

    set newuri [string map "/text5/text6/text7/$filter/text4" [string tolower [HTTP::uri]]]

    HTTP::uri $newuri

    pool pool1

  }

}

 

Thanks for any assistance.

application delivery
iRules

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  • cjunior's avatar
    cjunior
    Icon for Nacreous rankNacreous
    Jun 09, 2020

    Hello,

    Is that URI a fixed one with one wildcard piece?

    If so, I would do this way:

    when HTTP_REQUEST {
    # Checks whether the path starts with /text1/text2/text3 and ends with /text4
    if {  [string match -nocase {/text1/text2/text3/*/text4} [HTTP::path]] } {
        # Put /text5/text6/text7, append original URI from 18 char to end (Skip the starts length from /text1/text2/text3)
        HTTP::uri "/text5/text6/text7[string range [HTTP::uri] 18 end]"
        pool pool1
    }
}

    Regards

    • tfs128's avatar
      tfs128
      Icon for Nimbostratus rankNimbostratus
      Jun 09, 2020

      Correct, only the wildcard can vary. It will always come in starting with /text1/text2/text3 which I'll need to change into /text5/text6/text7. The /wildcard/text4 will always end the URI.