37 lines
1.2 KiB
Go
37 lines
1.2 KiB
Go
package responsemodifers
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import (
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_ "embed"
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"fmt"
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"strings"
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"ladder/proxychain"
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"ladder/proxychain/responsemodifers/rewriters"
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)
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// RewriteHTMLResourceURLs modifies HTTP responses
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// to rewrite URLs attributes in HTML content (such as src, href)
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// - `<img src='/relative_path'>` -> `<img src='/https://proxiedsite.com/relative_path'>`
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// - This function is designed to allow the proxified page
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// to still be browsible by routing all resource URLs through the proxy.
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func RewriteHTMLResourceURLs() proxychain.ResponseModification {
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return func(chain *proxychain.ProxyChain) error {
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// don't add rewriter if it's not even html
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ct := chain.Response.Header.Get("content-type")
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if !strings.HasPrefix(ct, "text/html") {
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return nil
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}
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// proxyURL is the URL of the ladder: http://localhost:8080 (ladder)
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originalURI := chain.Context.Request().URI()
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proxyURL := fmt.Sprintf("%s://%s", originalURI.Scheme(), originalURI.Host())
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// replace http.Response.Body with a readcloser that wraps the original, modifying the html attributes
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rr := rewriters.NewHTMLTokenURLRewriter(chain.Request.URL, proxyURL)
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htmlRewriter := rewriters.NewHTMLRewriter(chain.Response.Body, rr)
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chain.Response.Body = htmlRewriter
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return nil
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}
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}
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