diff options
Diffstat (limited to 'modules/caddyhttp/replacer.go')
| -rw-r--r-- | modules/caddyhttp/replacer.go | 37 |
1 files changed, 29 insertions, 8 deletions
diff --git a/modules/caddyhttp/replacer.go b/modules/caddyhttp/replacer.go index 439d245..cc29789 100644 --- a/modules/caddyhttp/replacer.go +++ b/modules/caddyhttp/replacer.go @@ -15,6 +15,7 @@ package caddyhttp import ( + "fmt" "net" "net/http" "net/textproto" @@ -28,6 +29,7 @@ import ( func addHTTPVarsToReplacer(repl caddy.Replacer, req *http.Request, w http.ResponseWriter) { httpVars := func(key string) (string, bool) { if req != nil { + // query string parameters if strings.HasPrefix(key, queryReplPrefix) { vals := req.URL.Query()[key[len(queryReplPrefix):]] // always return true, since the query param might @@ -35,6 +37,7 @@ func addHTTPVarsToReplacer(repl caddy.Replacer, req *http.Request, w http.Respon return strings.Join(vals, ","), true } + // request header fields if strings.HasPrefix(key, reqHeaderReplPrefix) { field := key[len(reqHeaderReplPrefix):] vals := req.Header[textproto.CanonicalMIMEHeaderKey(field)] @@ -43,6 +46,7 @@ func addHTTPVarsToReplacer(repl caddy.Replacer, req *http.Request, w http.Respon return strings.Join(vals, ","), true } + // cookies if strings.HasPrefix(key, cookieReplPrefix) { name := key[len(cookieReplPrefix):] for _, cookie := range req.Cookies() { @@ -87,14 +91,7 @@ func addHTTPVarsToReplacer(repl caddy.Replacer, req *http.Request, w http.Respon return req.URL.RawQuery, true } - if strings.HasPrefix(key, respHeaderReplPrefix) { - field := key[len(respHeaderReplPrefix):] - vals := w.Header()[textproto.CanonicalMIMEHeaderKey(field)] - // always return true, since the header field might - // be present only in some requests - return strings.Join(vals, ","), true - } - + // hostname labels if strings.HasPrefix(key, hostLabelReplPrefix) { idxStr := key[len(hostLabelReplPrefix):] idx, err := strconv.Atoi(idxStr) @@ -111,6 +108,7 @@ func addHTTPVarsToReplacer(repl caddy.Replacer, req *http.Request, w http.Respon return hostLabels[idx], true } + // path parts if strings.HasPrefix(key, pathPartsReplPrefix) { idxStr := key[len(pathPartsReplPrefix):] idx, err := strconv.Atoi(idxStr) @@ -129,9 +127,31 @@ func addHTTPVarsToReplacer(repl caddy.Replacer, req *http.Request, w http.Respon } return pathParts[idx], true } + + // middleware variables + if strings.HasPrefix(key, varsReplPrefix) { + varName := key[len(varsReplPrefix):] + tbl := req.Context().Value(VarCtxKey).(map[string]interface{}) + raw, ok := tbl[varName] + if !ok { + // variables can be dynamic, so always return true + // even when it may not be set; treat as empty + return "", true + } + // do our best to convert it to a string efficiently + switch val := raw.(type) { + case string: + return val, true + case fmt.Stringer: + return val.String(), true + default: + return fmt.Sprintf("%s", val), true + } + } } if w != nil { + // response header fields if strings.HasPrefix(key, respHeaderReplPrefix) { field := key[len(respHeaderReplPrefix):] vals := w.Header()[textproto.CanonicalMIMEHeaderKey(field)] @@ -153,5 +173,6 @@ const ( cookieReplPrefix = "http.request.cookie." hostLabelReplPrefix = "http.request.host.labels." pathPartsReplPrefix = "http.request.uri.path." + varsReplPrefix = "http.var." respHeaderReplPrefix = "http.response.header." ) |