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Forum Discussion

RossVermette's avatar
RossVermette
Icon for Nimbostratus rankNimbostratus
Feb 17, 2016

AppDynamics custom script injection

Hey,

 

I'm looking for a way to host a java script file name adrum.js (either by using an iFile or other method) and modify a variable that is set in that file based on HTTP host header name matches that is accessing the file. In the java script(adrum.js) the content contains ";a.appKey=window["adrum-app-key"]||"EUM-AAB-AUC";" embedded into some other code.

 

Example:

 

If the HTTP host header matches "devserver1" then set the string in the java script line to "EUM-AAB-AUD" or if HTTP host header matches "devserver2" then set the sting in the java script line to "EUM-AAB-AUF"

 

Here is what I was thinking, use a Data group to controls the HTTP::host(devserve1,devserver2) to variable mappings(EUM-AAB-AUD, EUM-AAB-AUF), host the java script file as an iFile. Anybody have any ideas or suggestions?

 

When HTTP_REQUEST { set APP_VAR_NAME [class find [HTTP::host] DATAGROUP1 ] switch {[string tolower [HTTP::uri]} { "/adrum.js" { HTTP::respond 200 content (get ifile) content-type "text/javascript" } }

 

application delivery
iRules
LTM

2 Replies

  • Kai_Wilke's avatar
    Kai_Wilke
    Icon for MVP rankMVP
    Feb 18, 2016

    Hi Ross,

     

    check the iRule below to see how your *.js can be fetched from an iFile with the additional "adrum-app-key" content replacement...

     

    when HTTP_REQUEST { 
    if { [string tolower [HTTP::uri]] eq "/adrum.js" } then {
        HTTP::respond 200 content [string map [list "adrum-app-key" [class lookup [HTTP::host] DATAGROUP1]] [ifile get "ifile-adrum.js"]] content-type "text/javascript"
    }   
}

    ... to understand this code you may also read the very much less optimized version of...

     

    when HTTP_REQUEST { 
    if { [string tolower [HTTP::uri]] eq "/adrum.js" } then {
        set APP_VAR_NAME [class lookup [HTTP::host] DATAGROUP1]
        set APP_VAR_NAME_REPLACEMENT [list "adrum-app-key" $APP_VAR_NAME]
        set IFILE_RAW_CONTENT [ifile get "ifile-adrum.js"]
        set IFILE_FINAL_CONTENT [string map $APP_VAR_NAME_REPLACEMENT $IFILE_RAW_CONTENT]
        HTTP::respond 200 content $IFILE_FINAL_CONTENT Content-Type "text/javascript"
    }   
}

    Cheers, Kai

     

  • Walter_Kacynski's avatar
    Walter_Kacynski
    Icon for Cirrostratus rankCirrostratus
    Feb 18, 2016

    There is no need to host adrum.js locally, let the AppDynamics CDN serve this file for you. Instead, you can use STREAM profiles, or a new option HTML Profiles to dynamically re-write the content in your pages. The advantage here is that you can put the EUM key in a data group as well. This is something that I have not done yet, but it is on my todo list.

     

    I just posted my code out on CodeShare since this is a work in progress

     

    https://devcentral.f5.com/codeshare/appdynamics-eum-javascript-injection-for-selective-urls