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corsmiddleware_utils.go
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/
corsmiddleware_utils.go
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package corsmiddleware
import (
"fmt"
"os"
"regexp"
"strings"
)
// RemoveDuplicates create a new slice omitting duplicate values.
func RemoveDuplicates[T comparable](slice []T) []T {
seen := make(map[T]bool)
result := []T{}
for _, val := range slice {
if _, ok := seen[val]; !ok {
seen[val] = true
result = append(result, val)
}
}
return result
}
// Contains find if array contains the received value.
func Contains[T comparable](s []T, e T) bool {
for _, v := range s {
if v == e {
return true
}
}
return false
}
// MergeAndUniques merge slices whit uniques values.
func MergeAndUniques(slices ...[]string) []string {
var input []string
for _, chunk := range slices {
input = append(input, chunk...)
}
return RemoveDuplicates(input)
}
// CompileOrigins transform raw origins to Regexp.
func CompileOrigins(origin []string) ([]*regexp.Regexp, error) {
regexReplacer := strings.NewReplacer(".", "\\.", "*", ".*")
originsRegex := make([]*regexp.Regexp, len(origin))
for i, v := range origin {
var err error
vFix := regexReplacer.Replace(v)
originsRegex[i], err = regexp.Compile(vFix)
if err != nil {
return nil, fmt.Errorf("error compiling origin '%s': %w", v, err)
}
}
return originsRegex, nil
}
// AllowOrigin check if the array of origins match with of received origin request.
func AllowOrigin(origins []*regexp.Regexp, origin string) bool {
for _, reg := range origins {
if reg.MatchString(origin) {
return true
}
}
return false
}
// WriteLogLine write plugin log
func WriteLogLine(name string, message string) {
if strings.HasSuffix(message, "\n") {
message = strings.Trim(message, "\n")
}
_, _ = os.Stdout.WriteString(fmt.Sprintf("corsmiddleware:[%v]> %v\n", name, message))
}