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// Copyright 2025 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package urlutil
import "net/url"
// SetParam overrides the specific key from the URL.
// It does not take into account that there may be multiple parameters with the same name.
func SetParam(baseURL, key, value string) string {
return TransformParam(baseURL, key, func(_ []string) []string {
if value == "" {
return nil
}
return []string{value}
})
}
// DropParam removes the specific key=value pair from the URL
// (it's possible to have many of parameters with the same name).
// Set value="" to remove the key regardless of the value.
func DropParam(baseURL, key, value string) string {
return TransformParam(baseURL, key, func(oldValues []string) []string {
if value == "" {
return nil
}
var newValues []string
for _, iterVal := range oldValues {
if iterVal != value {
newValues = append(newValues, iterVal)
}
}
return newValues
})
}
// TransformParam is a generic method that transforms the set of values
// for the specified URL parameter key.
func TransformParam(baseURL, key string, f func([]string) []string) string {
if baseURL == "" {
return ""
}
parsed, err := url.Parse(baseURL)
if err != nil {
return ""
}
values := parsed.Query()
ret := f(values[key])
if len(ret) == 0 {
values.Del(key)
} else {
values[key] = ret
}
parsed.RawQuery = values.Encode()
return parsed.String()
}
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