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url.go
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url.go
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package imagekit
import (
"crypto/hmac"
"crypto/sha1"
"encoding/hex"
"fmt"
neturl "net/url"
"sort"
"strconv"
"strings"
"time"
ikurl "github.com/imagekit-developer/imagekit-go/url"
)
const DEFAULT_TIMESTAMP = 9999999999
// Url generates url from UrlParam
func (ik *ImageKit) Url(params ikurl.UrlParam) (string, error) {
var resultUrl string
var url *neturl.URL
var err error
var endpoint = params.UrlEndpoint
if endpoint == "" {
endpoint = ik.Config.Cloud.UrlEndpoint
}
endpoint = strings.TrimRight(endpoint, "/") + "/"
if params.QueryParameters == nil {
params.QueryParameters = make(map[string]string)
}
if params.Src == "" {
if url, err = neturl.Parse(endpoint); err != nil {
return "", err
}
if params.Transformations == nil {
if url, err = neturl.Parse(endpoint + params.Path); err != nil {
return "", err
}
} else {
if params.TransformationPosition == ikurl.QUERY {
params.QueryParameters["tr"] = joinTransformations(params.Transformations...)
url, err = neturl.Parse(strings.TrimRight(endpoint, "/") + "/" + strings.TrimLeft(params.Path, "/"))
} else {
url, err = neturl.Parse(url.String() +
"tr:" + joinTransformations(params.Transformations...) +
"/" + strings.TrimLeft(params.Path, "/"))
}
}
} else {
if url, err = neturl.Parse(params.Src); err != nil {
return "", err
}
if params.Transformations != nil {
params.QueryParameters["tr"] = joinTransformations(params.Transformations...)
}
}
if err != nil {
return "", nil
}
query := url.Query()
for k, v := range params.QueryParameters {
query.Set(k, v)
}
url.RawQuery = query.Encode()
resultUrl = url.String()
if params.Signed {
var now int64
if params.UnixTime == nil {
now = time.Now().Unix()
} else {
now = params.UnixTime()
}
var expires string
if params.ExpireSeconds > 0 {
expires = strconv.FormatInt(now+int64(params.ExpireSeconds), 10)
} else {
expires = strconv.Itoa(DEFAULT_TIMESTAMP)
}
var path = strings.Replace(resultUrl, endpoint, "", 1)
path = strings.TrimPrefix(path, "/")
path = path + expires
mac := hmac.New(sha1.New, []byte(ik.Config.Cloud.PrivateKey))
mac.Write([]byte(path))
signature := hex.EncodeToString(mac.Sum(nil))
if strings.Index(resultUrl, "?") > -1 {
if params.ExpireSeconds > 0 && params.ExpireSeconds != DEFAULT_TIMESTAMP {
resultUrl = resultUrl + "&" + fmt.Sprintf("ik-t=%s&ik-s=%s", expires, signature)
} else {
resultUrl = resultUrl + "&" + fmt.Sprintf("ik-s=%s", signature)
}
} else {
if params.ExpireSeconds > 0 && params.ExpireSeconds != DEFAULT_TIMESTAMP {
resultUrl = resultUrl + "?" + fmt.Sprintf("ik-t=%s&ik-s=%s", expires, signature)
} else {
resultUrl = resultUrl + "?" + fmt.Sprintf("ik-s=%s", signature)
}
}
}
return resultUrl, nil
}
func joinTransformations(args ...map[string]any) string {
var parts []string
for _, v := range args {
parts = append(parts, transform(v))
}
return strings.Join(parts, ":")
}
func transform(tr map[string]any) string {
var parts []string
for k, v := range tr {
value := fmt.Sprintf("%v", v)
if k == "raw" {
parts = append(parts, value)
continue
}
prefix, ok := ikurl.TransformationCode[k]
if !ok {
parts = append(parts, value)
continue
}
if v == "-" {
parts = append(parts, prefix)
} else {
if prefix == "di" || prefix == "oi" {
value = strings.ReplaceAll(strings.Trim(value, "/"), "/", "@@")
}
parts = append(parts, prefix+"-"+value)
}
}
sort.Strings(parts)
return strings.Join(parts, ",")
}