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Dennis_Goss_70_'s avatar
Dennis_Goss_70_
Icon for Nimbostratus rankNimbostratus
Dec 21, 2015

iRule redirect but need some of the original PATH

Relatively new to iRules but have done a ton of scripting (PoSh, vbs, etc...) and understand the basics and have studied the http::uri, http::path and http::query built-in variables - thanks in advance for your assistance!

 

I have an incoming URL like "https://www.mycompany.com/management/dept/eng/corporatecommunications/Shared%20Documents/Mine.docx?OpenDocument"

 

The query parameter (OpenDocument) may or may not exist - need to plan for both.

 

I need the redirect URI to be: "https://www.mycompany.com/sites/corpcomm/Shared%20Documents/Mine.docx?OpenDocument"

 

I don't have a BIGIP to test with so I've built a few PoSh functions to create the http::uri, http::path, etc... variables to work against a string - not apples to apples but is shedding light on my problem.

 

I feel like I should be able to capture "/Shared%20Documents/Mine.docx?OpenDocument" in a couple of variables but uri::path depth isn't easy to replicate in PoSH. "/Shared%20Documents/" could be another layer or two or six deep - the text itself is just an example.

 

This is one scenario of many to follow with the same basic convention - we're using a switch statement now: switch -glob [string tolower [HTTP::uri]] but we are open to suggestions...

 

Thanks!

 

application delivery
iRules

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  • Stanislas_Piro2's avatar
    Stanislas_Piro2
    Icon for Cumulonimbus rankCumulonimbus
    Dec 21, 2015

    Hi,

    there are 2 solutions:

    string map to replace /management/dept/eng/corporatecommunications/ by /sites/corpcomm/

    HTTP::uri [string map "/management/dept/eng/corporatecommunications/ /sites/corpcomm/" [HTTP::uri]]

    string range to strip the begin of URI (45 first characters) and replace it by the new one:

    HTTP::uri /sites/corpcomm/[string range [HTTP::uri] 45 end]

    the second one is the most optimized for performances.

  • Kai_Wilke's avatar
    Kai_Wilke
    Icon for MVP rankMVP
    Dec 21, 2015

    Hi Dennis,

    the 

    [switch]
    command is ideal for content switching scenarios, where you have to evaluate 10-50 different URLs in a first-match condition. If you need to evaluate less than 10 different URLs, then the 
    [if]
    command would have some minor performance benefits, but would be a little more complex. And if you need to evaluate more than 50 different URLs, then the 
    [class]
    command in combination with data groups may come to its shine!

    The 

    [string tolower [HTTP::uri]]
    in combination with 
    -glob
    is also a very beginner friendly way to parse the URLs, since it may contain easy to understand String-Wildcards 
    *
    or Single-Letter-Wildcards 
    $
    which can be used as a trailing or leading wildcards, in combination with each other or even for both sides or in between of an URL search string.

    A 

    [switch]
    based 
    [HTTP::uri]
    evaluation followed by an redirect would look like that...

    when HTTP_REQUEST {
    switch -glob -- [string tolower [HTTP::uri]] "*/shared%20documents/mine.docx*" {
        HTTP::redirect "/sites/corpcomm/Shared%20Documents/Mine.docx?OpenDocument"
    } "*/corporatecommunications/shared%20documents/*" {
        HTTP::redirect "/sites/corpcomm/Shared%20Documents/"
    } default {
         Do nothing or select a pool
    }
}

    Cheers, Kai

  • Kai_Wilke's avatar
    Kai_Wilke
    Icon for MVP rankMVP
    Jan 01, 2016

    Hi Dennis,

     

    post your current code and we will help out... ;-)

     

    Cheers, Kai

     

  • Dennis_Goss_70_'s avatar
    Dennis_Goss_70_
    Icon for Nimbostratus rankNimbostratus
    Jan 02, 2016

    Thanks - the commented line works but redirects everything to the root of the site at the new location - not ideal since most folks love their deep link bookmarks...

    The last line is my latest attempt - not tested yet so it may be a winner? Thanks for the help!

    when HTTP_REQUEST { switch -glob [string tolower [HTTP::uri]] {

    "/oas/ops/programs*" { HTTP::redirect "https://www.mycompany.com[HTTP::uri]" }
"/offices/management/ocio/eng/tacticalcommunications*" { HTTP::redirect "https://www.mycompany.com/sites/taccom" }
"/offices/management/ocio/eng/tacticalcommunications*" { HTTP::redirect [string map {"/offices/management/ocio/eng/tacticalcommunications/" "/sites/taccom/"}[HTTP::uri]]}

    } }

  • Kai_Wilke's avatar
    Kai_Wilke
    Icon for MVP rankMVP
    Jan 02, 2016

    Hi Dennis,

     

    the code looks good. But i duno if you want to have relative redirects based on your website root. If you want a fixed https://* redirect, then take a look to the last line below...

     

    when HTTP_REQUEST { 
    switch -glob [string tolower [HTTP::uri]] {
        "/oas/ops/programs*" { HTTP::redirect "https://www.mycompany.com[HTTP::uri]" }

         Redirects http://* to http://* and https:// to https://* 
        "/offices/management/ocio/eng/tacticalcommunications*" { HTTP::redirect [string map {"/offices/management/ocio/eng/tacticalcommunications/" "/sites/taccom/"}[HTTP::uri]]}

         Redirects http://* and https://* to https://* with -nocase option
         "/offices/management/ocio/eng/tacticalcommunications*" { HTTP::redirect "https://www.mycompany.com[string map -nocase {"/offices/management/ocio/eng/tacticalcommunications/" "/sites/taccom/"} [HTTP::uri]]"}
    } 
}

    P.s.: In addition it contains a [string map -nocase] syntax to support case-insensitive deep-links. I guess it would be much more user friendly, isn't it? 😉

     

    Cheers, Kai