mirror of
https://github.com/caddyserver/caddy.git
synced 2024-12-27 14:13:48 +03:00
116 lines
3.3 KiB
Go
116 lines
3.3 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package caddyhttp
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import (
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"context"
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"fmt"
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"net/http"
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"github.com/caddyserver/caddy/v2"
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)
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func init() {
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caddy.RegisterModule(VarsMiddleware{})
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caddy.RegisterModule(VarsMatcher{})
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}
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// VarsMiddleware is an HTTP middleware which sets variables
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// in the context, mainly for use by placeholders. The
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// placeholders have the form: `{http.vars.variable_name}`
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type VarsMiddleware map[string]string
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// CaddyModule returns the Caddy module information.
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func (VarsMiddleware) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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ID: "http.handlers.vars",
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New: func() caddy.Module { return new(VarsMiddleware) },
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}
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}
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func (t VarsMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request, next Handler) error {
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vars := r.Context().Value(VarsCtxKey).(map[string]interface{})
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repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
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for k, v := range t {
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keyExpanded := repl.ReplaceAll(k, "")
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valExpanded := repl.ReplaceAll(v, "")
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vars[keyExpanded] = valExpanded
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}
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return next.ServeHTTP(w, r)
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}
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// VarsMatcher is an HTTP request matcher which can match
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// requests based on variables in the context.
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type VarsMatcher map[string]string
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// CaddyModule returns the Caddy module information.
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func (VarsMatcher) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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ID: "http.matchers.vars",
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New: func() caddy.Module { return new(VarsMatcher) },
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}
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}
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// Match matches a request based on variables in the context.
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func (m VarsMatcher) Match(r *http.Request) bool {
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vars := r.Context().Value(VarsCtxKey).(map[string]interface{})
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repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
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for k, v := range m {
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keyExpanded := repl.ReplaceAll(k, "")
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valExpanded := repl.ReplaceAll(v, "")
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var varStr string
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switch vv := vars[keyExpanded].(type) {
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case string:
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varStr = vv
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case fmt.Stringer:
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varStr = vv.String()
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case error:
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varStr = vv.Error()
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default:
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varStr = fmt.Sprintf("%v", vv)
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}
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if varStr != valExpanded {
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return false
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}
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}
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return true
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}
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// GetVar gets a value out of the context's variable table by key.
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// If the key does not exist, the return value will be nil.
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func GetVar(ctx context.Context, key string) interface{} {
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varMap, ok := ctx.Value(VarsCtxKey).(map[string]interface{})
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if !ok {
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return nil
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}
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return varMap[key]
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}
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// SetVar sets a value in the context's variable table with
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// the given key. It overwrites any previous value with the
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// same key.
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func SetVar(ctx context.Context, key string, value interface{}) {
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varMap, ok := ctx.Value(VarsCtxKey).(map[string]interface{})
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if !ok {
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return
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}
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varMap[key] = value
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}
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// Interface guards
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var (
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_ MiddlewareHandler = (*VarsMiddleware)(nil)
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_ RequestMatcher = (*VarsMatcher)(nil)
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)
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