mirror of
https://github.com/imgproxy/imgproxy.git
synced 2024-12-09 09:56:01 +02:00
46 lines
1.0 KiB
Go
46 lines
1.0 KiB
Go
package main
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import (
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"crypto/hmac"
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"crypto/sha256"
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"encoding/base64"
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"encoding/hex"
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"fmt"
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"log"
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)
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func main() {
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key := "943b421c9eb07c830af81030552c86009268de4e532ba2ee2eab8247c6da0881"
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salt := "520f986b998545b4785e0defbc4f3c1203f22de2374a3d53cb7a7fe9fea309c5"
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var keyBin, saltBin []byte
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var err error
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if keyBin, err = hex.DecodeString(key); err != nil {
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log.Fatalln("Key expected to be hex-encoded string")
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}
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if saltBin, err = hex.DecodeString(salt); err != nil {
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log.Fatalf("Salt expected to be hex-encoded string")
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}
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resize := "fill"
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width := 300
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height := 300
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gravity := "no"
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enlarge := 1
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extension := "png"
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url := "http://img.example.com/pretty/image.jpg"
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encodedURL := base64.RawURLEncoding.EncodeToString([]byte(url))
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path := fmt.Sprintf("/%s/%d/%d/%s/%d/%s.%s", resize, width, height, gravity, enlarge, encodedURL, extension)
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mac := hmac.New(sha256.New, keyBin)
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mac.Write(saltBin)
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mac.Write([]byte(path))
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signature := base64.RawURLEncoding.EncodeToString(mac.Sum(nil))
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fmt.Printf("/%s%s", signature, path)
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}
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