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@@ -0,0 +1,33 @@
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+(ns imgproxy-test
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+ (:require
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+ [clojure.test :refer [deftest is]])
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+ (:import
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+ (java.util Base64)
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+ (javax.crypto Mac)
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+ (javax.crypto.spec SecretKeySpec)))
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+
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+(defn hex-string-to-byte-array
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+ [hex]
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+ (let [res (byte-array (/ (count hex) 2))]
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+ (dotimes [i (count res)]
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+ (aset res
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+ i
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+ (unchecked-byte (bit-or (bit-shift-left (Character/digit (nth hex (* i 2)) 16) 4)
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+ (Character/digit (nth hex (+ (* i 2) 1)) 16)))))
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+ res))
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+
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+(defn sign-path
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+ [key salt path]
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+ (let [mac (doto (Mac/getInstance "HmacSHA256") (.init (SecretKeySpec. key "HmacSHA256")))
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+ _ (.update mac salt)
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+ hash (.doFinal mac (.getBytes path "UTF-8"))
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+ encoded-hash (.. (Base64/getUrlEncoder) withoutPadding (encodeToString hash))]
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+ (str "/" encoded-hash path)))
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+
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+(deftest test-with-hmac-base64-img-proxy-test
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+ (is
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+ (=
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+ "/m3k5QADfcKPDj-SDI2AIogZbC3FlAXszuwhtWXYqavc/rs:fit:300:300/plain/http://img.example.com/pretty/image.jpg"
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+ (sign-path (hex-string-to-byte-array "943b421c9eb07c830af81030552c86009268de4e532ba2ee2eab8247c6da0881")
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+ (hex-string-to-byte-array "520f986b998545b4785e0defbc4f3c1203f22de2374a3d53cb7a7fe9fea309c5")
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+ "/rs:fit:300:300/plain/http://img.example.com/pretty/image.jpg"))))
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Aaron