Dealing with depression

Policies with inline overrides

14 min ago 16 comments
By Pugsy Malone

This page demonstrates the how policy rules can be overriden by parameters specified inline.


  table io_policies {
    "article-main": "crop=660:438&width=660",
    "article-large": "crop=318:212&width=318",
    "article-medium": "crop=250:166&width=250",
    "thumb": "crop=80:53&width=80",
    "avatar": "crop=1:1&width=150",
  }

  sub vcl_recv {
  #FASTLY recv

    // Return non-image
    if (req.url.path !~ "(?i)\.(?:jpg|png)$" 
      || req.url.path !~ "/images/") {
      return(lookup);
    }

    // Signal to send to IO
    set req.http.X-Fastly-Imageopto-Api = "fastly";

    // Don't alter the request if we're running at 
    // the shield, it has already been rewritten
    if (req.http.Fastly-FF) {
        return (lookup);
    }
    
    // Policies only, but allow other parameters 
    // to override the policy
    if (req.url.qs ~ "(?:^|&)policy=([^&]+)") {
      set var.pol = re.group.1;
    }
    set req.url = req.url.path "?" req.url.qs "&" 
                  table.lookup(io_policies, var.pol);

  }
                

  //facepug.io/images/a7/pug-sad.jpg?policy=article-main

  //facepug.io/images/a7/pug-sad.jpg?policy=article-main&crop=1:1

  //facepug.io/images/a7/pug-sad.jpg?policy=article-main&width=300
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