Forum Discussion

Jonesey3000's avatar
Jonesey3000
Icon for Nimbostratus rankNimbostratus
Jun 16, 2021
Solved

iRULE regsub error

Hi Smart People

 

I am having some problems with an iRule that has been created on our F5 as a work around to a mixed content error we are receiving on a web page.

Our page uses HTTPS but there is some JS that is calling an HTTP page and causing the issue. I have an iRule in place to change it to an HTTPS reply, but I am having some problems with one of regsub commands.

The JSON result is {"result":{pathTo3DJSON":"http://genericsite.com:80/extrainfo/somefile.extension"}} and I am replacing the http with https and removing the :80 port number.

Running the iRule returns this - {"result":{pathTo3DJSON":"https://genericsite.com/extrainfo/somefile.extension"}}}}

I have an additional 2 } (braces) at the end of the result causing an error.

 

This is the code that I have so far. I just need to remove 2 } from the end of the result.

 

when HTTP_REQUEST {
if { [IP::client_addr] starts_with "my.public.IP.address" } {
    }
    if { [HTTP::has_responded] } { return }
    if { [string tolower [HTTP::path]] == "/website/generate3dview.wcr" } {
        set doRewrite [HTTP::path]
    }
}
when HTTP_RESPONSE {
    if { [info exists doRewrite] } {
        HTTP::collect [HTTP::header Content-Length]
        set clen [HTTP::header Content-Length]
        incr clen -2
        unset doRewrite
    }
}
when HTTP_RESPONSE_DATA {
    regsub "http://" [HTTP::payload] "https://" fixeddata
    regsub ":80" $fixeddata "" fixeddata1
    regsub "}}}}" $fixeddata1 "}}" fixeddata2
    HTTP::payload replace 0 $clen $fixeddata2
    HTTP::release
}

The error I receive on the F5 iRule page is

 

01070151:3: Rule [/Common/testing_irule] error: /Common/testing_irule:17: error: [unexpected extra argument "}}}""][when HTTP_RESPONSE_DATA {

regsub "http://" [HTTP::payload] "https://" fixeddata

# HTTP::payload replace 0 $clen $fixeddata

regsub ":80" $fixeddata "" fixeddata1

regsub "}}}}" $fixeddata1 "}}" fixeddata2]

/Common/testing_irule:21: error: [command is not valid in the current scope][HTTP::payload replace 0 $clen $fixeddata2]

/Common/testing_irule:22: error: [command is not valid in the current scope][HTTP::release]

/Common/testing_irule:23: error: [command is not valid in the current scope][}]

 

Thanks

  • To match a literal } in a string, you will need to escape it

    "\}\}\}\}"

3 Replies

  • To match a literal } in a string, you will need to escape it

    "\}\}\}\}"
      • Simon_Blakely's avatar
        Simon_Blakely
        Icon for Employee rankEmployee

        For an easier irule, try something like

        regsub {http:\/\/(.*):80} [HTTP::payload] {https://\1} fixeddata
         
        % puts $payload
        \{\"result\":\{pathTo3DJSON\":\"http://genericsite.com:80/extrainfo/somefile.extension\"\}\}
        % regsub {http:\/\/(.*):80} $payload {https://\1} fixeddata
        % puts $fixeddata
        \{\"result\":\{pathTo3DJSON\":\"https://genericsite.com/extrainfo/somefile.extension\"\}\}

        The regsub matches the whole string starting with http and ending with :80

        It also creates a matching group of the fqdn between :// and :80.

        You then substitute https://<first matching group> into the result.

        Much more efficient.