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analytics.go
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/
analytics.go
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package asset
import (
"errors"
"fmt"
"github.com/cloudinary/cloudinary-go/v2/api"
"runtime"
"strconv"
"strings"
"sync"
)
const queryString = "_a"
const algoVersion = "A" // The version of the algorithm
const sdkCode = "Q" // Cloudinary Go SDK
var sdkVersion = api.Version
var techVersion = strings.Join(strings.Split(strings.TrimPrefix(runtime.Version(), "go"), ".")[:2], ".")
const chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
const binaryPadSize = 6
var charCodes = map[string]string{}
var analyticsSignature = ""
var mutex = &sync.Mutex{}
func sdkAnalyticsSignature() string {
if analyticsSignature != "" {
return analyticsSignature
}
sdkVersionStr, err := encodeVersion(sdkVersion)
if err != nil {
analyticsSignature = "E"
return analyticsSignature
}
techVersionStr, err := encodeVersion(techVersion)
if err != nil {
analyticsSignature = "E"
return analyticsSignature
}
analyticsSignature = fmt.Sprintf("%s%s%s%s", algoVersion, sdkCode, sdkVersionStr, techVersionStr)
return analyticsSignature
}
func encodeVersion(version string) (string, error) {
parts := strings.Split(version, ".")
paddedParts := make([]string, len(parts))
for i, v := range parts {
vInt, _ := strconv.Atoi(v)
paddedParts[i] = fmt.Sprintf("%02d", vInt)
}
// reverse (in this case swap first and last elements)
paddedParts[0], paddedParts[len(paddedParts)-1] = paddedParts[len(paddedParts)-1], paddedParts[0]
num, _ := strconv.Atoi(strings.Join(paddedParts, ""))
paddedBinary := intToPaddedBin(num, len(parts)*binaryPadSize)
if len(paddedBinary)%binaryPadSize != 0 {
return "", errors.New("version must be smaller than 43.21.26")
}
encodedChars := make([]string, len(parts))
for i := 0; i < len(parts); i++ {
encodedChars[i] = getKey(paddedBinary[i*binaryPadSize : (i+1)*binaryPadSize])
}
return strings.Join(encodedChars, ""), nil
}
func getKey(binaryValue string) string {
if len(charCodes) == 0 {
mutex.Lock()
if len(charCodes) == 0 {
for i, char := range chars {
charCodes[intToPaddedBin(i, binaryPadSize)] = string(char)
}
}
mutex.Unlock()
}
return charCodes[binaryValue]
}
func intToPaddedBin(integer int, padNum int) string {
return fmt.Sprintf("%0*b", padNum, integer)
}