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package throttled
import (
"bytes"
"net/http"
"strings"
)
// VaryBy defines the criteria to use to group requests.
type VaryBy struct {
// Vary by the RemoteAddr as specified by the net/http.Request field.
RemoteAddr bool
// Vary by the HTTP Method as specified by the net/http.Request field.
Method bool
// Vary by the URL's Path as specified by the Path field of the net/http.Request
// URL field.
Path bool
// Vary by this list of header names, read from the net/http.Request Header field.
Headers []string
// Vary by this list of parameters, read from the net/http.Request FormValue method.
Params []string
// Vary by this list of cookie names, read from the net/http.Request Cookie method.
Cookies []string
// Use this separator string to concatenate the various criteria of the VaryBy struct.
// Defaults to a newline character if empty (\n).
Separator string
// Custom specifies the custom-generated key to use for this request.
// If not nil, the value returned by this function is used instead of any
// VaryBy criteria.
Custom func(r *http.Request) string
}
// Key returns the key for this request based on the criteria defined by the VaryBy struct.
func (vb *VaryBy) Key(r *http.Request) string {
var buf bytes.Buffer
if vb == nil {
return "" // Special case for no vary-by option
}
if vb.Custom != nil {
// A custom key generator is specified
return vb.Custom(r)
}
sep := vb.Separator
if sep == "" {
sep = "\n" // Separator defaults to newline
}
if vb.RemoteAddr {
buf.WriteString(strings.ToLower(r.RemoteAddr) + sep)
}
if vb.Method {
buf.WriteString(strings.ToLower(r.Method) + sep)
}
for _, h := range vb.Headers {
buf.WriteString(strings.ToLower(r.Header.Get(h)) + sep)
}
if vb.Path {
buf.WriteString(r.URL.Path + sep)
}
for _, p := range vb.Params {
buf.WriteString(r.FormValue(p) + sep)
}
for _, c := range vb.Cookies {
ck, err := r.Cookie(c)
if err == nil {
buf.WriteString(ck.Value)
}
buf.WriteString(sep) // Write the separator anyway, whether or not the cookie exists
}
return buf.String()
}
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