Fast and extensible multi-platform HTTP/1-2-3 web server with automatic HTTPS
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| 1 | // Copyright 2015 Matthew Holt and The Caddy Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package templates |
| 16 | |
| 17 | import ( |
| 18 | "bytes" |
| 19 | "errors" |
| 20 | "fmt" |
| 21 | "net/http" |
| 22 | "strconv" |
| 23 | "strings" |
| 24 | "text/template" |
| 25 | |
| 26 | "go.uber.org/zap" |
| 27 | |
| 28 | "github.com/caddyserver/caddy/v2" |
| 29 | "github.com/caddyserver/caddy/v2/modules/caddyhttp" |
| 30 | ) |
| 31 | |
| 32 | func init() { |
| 33 | caddy.RegisterModule(Templates{}) |
| 34 | } |
| 35 | |
| 36 | // Templates is a middleware which executes response bodies as Go templates. |
| 37 | // The syntax is documented in the Go standard library's |
| 38 | // [text/template package](https://golang.org/pkg/text/template/). |
| 39 | // Note that ANY response body that matches and qualifies may be evaluated, |
| 40 | // even if it comes from a proxied backend. |
| 41 | // |
| 42 | // ⚠️ Template functions/actions can access the environment, files on disk, |
| 43 | // and make HTTP requests. This is extremely useful, but you need to make |
| 44 | // sure templates are only evaluated on content that you trust, control, or |
| 45 | // at least sanitize properly. |
| 46 | // |
| 47 | // ⚠️ Templates are still experimental, so they are subject to change. |
| 48 | // |
| 49 | // [All Sprig functions](https://masterminds.github.io/sprig/) are supported. |
| 50 | // |
| 51 | // Custom template functions can be registered by creating a plugin module |
| 52 | // under the `http.handlers.templates.functions.*` namespace that implements |
| 53 | // the `CustomFunctions` interface. |
| 54 | // |
| 55 | // In addition to the standard functions and the Sprig library, Caddy adds |
| 56 | // extra functions and data that are available to a template: |
| 57 | // |
| 58 | // ##### `.Args` |
| 59 | // |
| 60 | // A slice of arguments passed to this page/context, for example |
| 61 | // as the result of a [`include`](#include). |
| 62 | // |
| 63 | // ``` |
| 64 | // {{index .Args 0}} // first argument |
| 65 | // ``` |
| 66 | // |
| 67 | // ##### `.Cookie` |
| 68 | // |
| 69 | // Gets the value of a cookie by name. |
| 70 | // |
| 71 | // ``` |
| 72 | // {{.Cookie "cookiename"}} |
| 73 | // ``` |
| 74 | // |
| 75 | // ##### `env` |
| 76 | // |
| 77 | // Gets an environment variable. |
| 78 | // |
| 79 | // ``` |
| 80 | // {{env "VAR_NAME"}} |
| 81 | // ``` |
| 82 | // |
| 83 | // ##### `placeholder` |
| 84 | // |
| 85 | // Gets an [placeholder variable](/docs/conventions#placeholders). |
| 86 | // The braces (`{}`) have to be omitted. |
| 87 | // |
| 88 | // ``` |
| 89 | // {{placeholder "http.request.uri.path"}} |
| 90 | // {{placeholder "http.error.status_code"}} |
| 91 | // ``` |
| 92 | // |
| 93 | // As a shortcut, `ph` is an alias for `placeholder`. |
| 94 | // |
| 95 | // ``` |
| 96 | // {{ph "http.request.method"}} |
| 97 | // ``` |
| 98 | // |
| 99 | // ##### `.Host` |
| 100 | // |
| 101 | // Returns the hostname portion (no port) of the Host header of the HTTP request. |
| 102 | // |
| 103 | // ``` |
| 104 | // {{.Host}} |
| 105 | // ``` |
| 106 | // |
| 107 | // ##### `httpInclude` |
| 108 | // |
| 109 | // Includes the contents of another file, and renders it in-place, |
| 110 | // by making a virtual HTTP request (also known as a sub-request). |
| 111 | // The URI path must exist on the same virtual server because the |
| 112 | // request does not use sockets; instead, the request is crafted in |
| 113 | // memory and the handler is invoked directly for increased efficiency. |
| 114 | // |
| 115 | // ``` |
| 116 | // {{httpInclude "/foo/bar?q=val"}} |
| 117 | // ``` |
| 118 | // |
| 119 | // ##### `import` |
| 120 | // |
| 121 | // Reads and returns the contents of another file, and parses it |
| 122 | // as a template, adding any template definitions to the template |
| 123 | // stack. If there are no definitions, the filepath will be the |
| 124 | // definition name. Any `{{ define }}` blocks will be accessible by |
| 125 | // `{{ template }}` or `{{ block }}`. Imports must happen before the |
| 126 | // template or block action is called. Note that the contents are |
| 127 | // NOT escaped, so you should only import trusted template files. |
| 128 | // |
| 129 | // **filename.html** |
| 130 | // ``` |
| 131 | // {{ define "main" }} |
| 132 | // content |
| 133 | // {{ end }} |
| 134 | // ``` |
| 135 | // |
| 136 | // **index.html** |
| 137 | // ``` |
| 138 | // {{ import "/path/to/filename.html" }} |
| 139 | // {{ template "main" }} |
| 140 | // ``` |
| 141 | // |
| 142 | // ##### `include` |
| 143 | // |
| 144 | // Includes the contents of another file, rendering it in-place. |
| 145 | // Optionally can pass key-value pairs as arguments to be accessed |
| 146 | // by the included file. Use [`.Args N`](#args) to access the N-th |
| 147 | // argument, 0-indexed. Note that the contents are NOT escaped, so |
| 148 | // you should only include trusted template files. |
| 149 | // |
| 150 | // ``` |
| 151 | // {{include "path/to/file.html"}} // no arguments |
| 152 | // {{include "path/to/file.html" "arg0" 1 "value 2"}} // with arguments |
| 153 | // ``` |
| 154 | // |
| 155 | // ##### `readFile` |
| 156 | // |
| 157 | // Reads and returns the contents of another file, as-is. |
| 158 | // Note that the contents are NOT escaped, so you should |
| 159 | // only read trusted files. |
| 160 | // |
| 161 | // ``` |
| 162 | // {{readFile "path/to/file.html"}} |
| 163 | // ``` |
| 164 | // |
| 165 | // ##### `listFiles` |
| 166 | // |
| 167 | // Returns a list of the files in the given directory, which is relative |
| 168 | // to the template context's file root. |
| 169 | // |
| 170 | // ``` |
| 171 | // {{listFiles "/mydir"}} |
| 172 | // ``` |
| 173 | // |
| 174 | // ##### `fileExists` |
| 175 | // |
| 176 | // Returns true if the given file name, relative to the template context's file root, |
| 177 | // can be opened successfully. |
| 178 | // |
| 179 | // ``` |
| 180 | // {{fileExists "path/to/file.html"}} |
| 181 | // ``` |
| 182 | // |
| 183 | // ##### `fileStat` |
| 184 | // |
| 185 | // Returns [FileInfo](https://pkg.go.dev/io/fs#FileInfo) using [Stat](https://pkg.go.dev/io/fs#Stat) |
| 186 | // on the given file name, relative to the template context's file root. |
| 187 | // |
| 188 | // ``` |
| 189 | // {{$css := fileStat "css/style.css" -}} |
| 190 | // <link rel="stylesheet" href="/css/style.css?v={{ $css.ModTime.Unix }}"> |
| 191 | // ``` |
| 192 | // |
| 193 | // ##### `markdown` |
| 194 | // |
| 195 | // Renders the given Markdown text as HTML and returns it. This uses the |
| 196 | // [Goldmark](https://github.com/yuin/goldmark) library, |
| 197 | // which is CommonMark compliant. It also has these extensions |
| 198 | // enabled: GitHub Flavored Markdown, Footnote, and syntax |
| 199 | // highlighting provided by [Chroma](https://github.com/alecthomas/chroma). |
| 200 | // |
| 201 | // ``` |
| 202 | // {{markdown "My _markdown_ text"}} |
| 203 | // ``` |
| 204 | // |
| 205 | // ##### `.RemoteIP` |
| 206 | // |
| 207 | // Returns the connection's IP address. |
| 208 | // |
| 209 | // ``` |
| 210 | // {{.RemoteIP}} |
| 211 | // ``` |
| 212 | // |
| 213 | // ##### `.ClientIP` |
| 214 | // |
| 215 | // Returns the real client's IP address, if `trusted_proxies` was configured, |
| 216 | // otherwise returns the connection's IP address. |
| 217 | // |
| 218 | // ``` |
| 219 | // {{.ClientIP}} |
| 220 | // ``` |
| 221 | // |
| 222 | // ##### `.Req` |
| 223 | // |
| 224 | // Accesses the current HTTP request, which has various fields, including: |
| 225 | // |
| 226 | // - `.Method` - the method |
| 227 | // - `.URL` - the URL, which in turn has component fields (Scheme, Host, Path, etc.) |
| 228 | // - `.Header` - the header fields |
| 229 | // - `.Host` - the Host or :authority header of the request |
| 230 | // |
| 231 | // ``` |
| 232 | // {{.Req.Header.Get "User-Agent"}} |
| 233 | // ``` |
| 234 | // |
| 235 | // ##### `.OriginalReq` |
| 236 | // |
| 237 | // Like [`.Req`](#req), except it accesses the original HTTP |
| 238 | // request before rewrites or other internal modifications. |
| 239 | // |
| 240 | // ##### `.RespHeader.Add` |
| 241 | // |
| 242 | // Adds a header field to the HTTP response. |
| 243 | // |
| 244 | // ``` |
| 245 | // {{.RespHeader.Add "Field-Name" "val"}} |
| 246 | // ``` |
| 247 | // |
| 248 | // ##### `.RespHeader.Del` |
| 249 | // |
| 250 | // Deletes a header field on the HTTP response. |
| 251 | // |
| 252 | // ``` |
| 253 | // {{.RespHeader.Del "Field-Name"}} |
| 254 | // ``` |
| 255 | // |
| 256 | // ##### `.RespHeader.Set` |
| 257 | // |
| 258 | // Sets a header field on the HTTP response, replacing any existing value. |
| 259 | // |
| 260 | // ``` |
| 261 | // {{.RespHeader.Set "Field-Name" "val"}} |
| 262 | // ``` |
| 263 | // |
| 264 | // ##### `httpError` |
| 265 | // |
| 266 | // Returns an error with the given status code to the HTTP handler chain. |
| 267 | // |
| 268 | // ``` |
| 269 | // {{if not (fileExists $includedFile)}}{{httpError 404}}{{end}} |
| 270 | // ``` |
| 271 | // |
| 272 | // ##### `splitFrontMatter` |
| 273 | // |
| 274 | // Splits front matter out from the body. Front matter is metadata that |
| 275 | // appears at the very beginning of a file or string. Front matter can |
| 276 | // be in YAML, TOML, or JSON formats: |
| 277 | // |
| 278 | // **TOML** front matter starts and ends with `+++`: |
| 279 | // |
| 280 | // ```toml |
| 281 | // +++ |
| 282 | // template = "blog" |
| 283 | // title = "Blog Homepage" |
| 284 | // sitename = "A Caddy site" |
| 285 | // +++ |
| 286 | // ``` |
| 287 | // |
| 288 | // **YAML** is surrounded by `---`: |
| 289 | // |
| 290 | // ```yaml |
| 291 | // --- |
| 292 | // template: blog |
| 293 | // title: Blog Homepage |
| 294 | // sitename: A Caddy site |
| 295 | // --- |
| 296 | // ``` |
| 297 | // |
| 298 | // **JSON** is simply `{` and `}`: |
| 299 | // |
| 300 | // ```json |
| 301 | // { |
| 302 | // "template": "blog", |
| 303 | // "title": "Blog Homepage", |
| 304 | // "sitename": "A Caddy site" |
| 305 | // } |
| 306 | // ``` |
| 307 | // |
| 308 | // The resulting front matter will be made available like so: |
| 309 | // |
| 310 | // - `.Meta` to access the metadata fields, for example: `{{$parsed.Meta.title}}` |
| 311 | // - `.Body` to access the body after the front matter, for example: `{{markdown $parsed.Body}}` |
| 312 | // |
| 313 | // ##### `stripHTML` |
| 314 | // |
| 315 | // Removes HTML from a string. |
| 316 | // |
| 317 | // ``` |
| 318 | // {{stripHTML "Shows <b>only</b> text content"}} |
| 319 | // ``` |
| 320 | // |
| 321 | // ##### `humanize` |
| 322 | // |
| 323 | // Transforms size and time inputs to a human readable format. |
| 324 | // This uses the [go-humanize](https://github.com/dustin/go-humanize) library. |
| 325 | // |
| 326 | // The first argument must be a format type, and the last argument |
| 327 | // is the input, or the input can be piped in. The supported format |
| 328 | // types are: |
| 329 | // - **size** which turns an integer amount of bytes into a string like `2.3 MB` |
| 330 | // - **time** which turns a time string into a relative time string like `2 weeks ago` |
| 331 | // |
| 332 | // For the `time` format, the layout for parsing the input can be configured |
| 333 | // by appending a colon `:` followed by the desired time layout. You can |
| 334 | // find the documentation on time layouts [in Go's docs](https://pkg.go.dev/time#pkg-constants). |
| 335 | // The default time layout is `RFC1123Z`, i.e. `Mon, 02 Jan 2006 15:04:05 -0700`. |
| 336 | // |
| 337 | // ``` |
| 338 | // {{humanize "size" "2048000"}} |
| 339 | // {{placeholder "http.response.header.Content-Length" | humanize "size"}} |
| 340 | // {{humanize "time" "Fri, 05 May 2022 15:04:05 +0200"}} |
| 341 | // {{humanize "time:2006-Jan-02" "2022-May-05"}} |
| 342 | // ``` |
| 343 | // |
| 344 | // ##### `pathEscape` |
| 345 | // |
| 346 | // Passes a string through `url.PathEscape`, replacing characters that have |
| 347 | // special meaning in URL path parameters (`?`, `&`, `%`). |
| 348 | // |
| 349 | // Useful e.g. to include filenames containing these characters in URL path |
| 350 | // parameters, or use them as an `img` element's `src` attribute. |
| 351 | // |
| 352 | // ``` |
| 353 | // {{pathEscape "50%_valid_filename?.jpg"}} |
| 354 | // ``` |
| 355 | // |
| 356 | // ##### `maybe` |
| 357 | // |
| 358 | // Invokes a custom template function only if it is registered (plugged-in) |
| 359 | // in the `http.handlers.templates.functions.*` namespace. |
| 360 | // |
| 361 | // The first argument is the function name, and any subsequent arguments |
| 362 | // are forwarded to that function. If the named function is not available, |
| 363 | // the invocation is ignored and a log message is emitted. |
| 364 | // |
| 365 | // This is useful for templates that optionally use components which may |
| 366 | // not be present in every build or environment. |
| 367 | // |
| 368 | // NOTE: This function is EXPERIMENTAL and subject to change or removal. |
| 369 | // |
| 370 | // ``` |
| 371 | // {{ maybe "myOptionalFunc" "arg1" 2 }} |
| 372 | // ``` |
| 373 | type Templates struct { |
| 374 | // The root path from which to load files. Required if template functions |
| 375 | // accessing the file system are used (such as include). Default is |
| 376 | // `{http.vars.root}` if set, or current working directory otherwise. |
| 377 | FileRoot string `json:"file_root,omitempty"` |
| 378 | |
| 379 | // The MIME types for which to render templates. It is important to use |
| 380 | // this if the route matchers do not exclude images or other binary files. |
| 381 | // Default is text/plain, text/markdown, and text/html. |
| 382 | MIMETypes []string `json:"mime_types,omitempty"` |
| 383 | |
| 384 | // The template action delimiters. If set, must be precisely two elements: |
| 385 | // the opening and closing delimiters. Default: `["{{", "}}"]` |
| 386 | Delimiters []string `json:"delimiters,omitempty"` |
| 387 | |
| 388 | // Extensions adds functions to the template's func map. These often |
| 389 | // act as components on web pages, for example. |
| 390 | ExtensionsRaw caddy.ModuleMap `json:"match,omitempty" caddy:"namespace=http.handlers.templates.functions"` |
| 391 | |
| 392 | customFuncs []template.FuncMap |
| 393 | logger *zap.Logger |
| 394 | } |
| 395 | |
| 396 | // CustomFunctions is the interface for registering custom template functions. |
| 397 | type CustomFunctions interface { |
| 398 | // CustomTemplateFunctions should return the mapping from custom function names to implementations. |
| 399 | CustomTemplateFunctions() template.FuncMap |
| 400 | } |
| 401 | |
| 402 | // CaddyModule returns the Caddy module information. |
| 403 | func (Templates) CaddyModule() caddy.ModuleInfo { |
| 404 | return caddy.ModuleInfo{ |
| 405 | ID: "http.handlers.templates", |
| 406 | New: func() caddy.Module { return new(Templates) }, |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | // Provision provisions t. |
| 411 | func (t *Templates) Provision(ctx caddy.Context) error { |
| 412 | t.logger = ctx.Logger() |
| 413 | mods, err := ctx.LoadModule(t, "ExtensionsRaw") |
| 414 | if err != nil { |
| 415 | return fmt.Errorf("loading template extensions: %v", err) |
| 416 | } |
| 417 | for _, modIface := range mods.(map[string]any) { |
| 418 | t.customFuncs = append(t.customFuncs, modIface.(CustomFunctions).CustomTemplateFunctions()) |
| 419 | } |
| 420 | |
| 421 | if t.MIMETypes == nil { |
| 422 | t.MIMETypes = defaultMIMETypes |
| 423 | } |
| 424 | if t.FileRoot == "" { |
| 425 | t.FileRoot = "{http.vars.root}" |
| 426 | } |
| 427 | return nil |
| 428 | } |
| 429 | |
| 430 | // Validate ensures t has a valid configuration. |
| 431 | func (t *Templates) Validate() error { |
| 432 | if len(t.Delimiters) != 0 && len(t.Delimiters) != 2 { |
| 433 | return fmt.Errorf("delimiters must consist of exactly two elements: opening and closing") |
| 434 | } |
| 435 | return nil |
| 436 | } |
| 437 | |
| 438 | func (t *Templates) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error { |
| 439 | buf := bufPool.Get().(*bytes.Buffer) |
| 440 | buf.Reset() |
| 441 | defer bufPool.Put(buf) |
| 442 | |
| 443 | // shouldBuf determines whether to execute templates on this response, |
| 444 | // since generally we will not want to execute for images or CSS, etc. |
| 445 | shouldBuf := func(status int, header http.Header) bool { |
| 446 | ct := header.Get("Content-Type") |
| 447 | for _, mt := range t.MIMETypes { |
| 448 | if strings.Contains(ct, mt) { |
| 449 | return true |
| 450 | } |
| 451 | } |
| 452 | return false |
| 453 | } |
| 454 | |
| 455 | rec := caddyhttp.NewResponseRecorder(w, buf, shouldBuf) |
| 456 | |
| 457 | err := next.ServeHTTP(rec, r) |
| 458 | if err != nil { |
| 459 | return err |
| 460 | } |
| 461 | if !rec.Buffered() { |
| 462 | return nil |
| 463 | } |
| 464 | |
| 465 | err = t.executeTemplate(rec, r) |
| 466 | if err != nil { |
| 467 | return err |
| 468 | } |
| 469 | |
| 470 | // responses without a body (HEAD, 1xx, 204, 304) can't tell us the |
| 471 | // length of the rendered template, so drop the header rather than |
| 472 | // advertising the length of the empty buffer, and a 2xx response to |
| 473 | // CONNECT must not have one at all (RFC 9110 §8.6) |
| 474 | connectSuccess := r.Method == http.MethodConnect && rec.Status() >= 200 && rec.Status() <= 299 |
| 475 | if r.Method == http.MethodHead || connectSuccess || !bodyAllowedForStatus(rec.Status()) { |
| 476 | rec.Header().Del("Content-Length") |
| 477 | } else { |
| 478 | rec.Header().Set("Content-Length", strconv.Itoa(buf.Len())) |
| 479 | } |
| 480 | rec.Header().Del("Accept-Ranges") // we don't know ranges for dynamically-created content |
| 481 | rec.Header().Del("Last-Modified") // useless for dynamic content since it's always changing |
| 482 | |
| 483 | // we don't know a way to quickly generate etag for dynamic content, |
| 484 | // and weak etags still cause browsers to rely on it even after a |
| 485 | // refresh, so disable them until we find a better way to do this |
| 486 | rec.Header().Del("Etag") |
| 487 | |
| 488 | return rec.WriteResponse() |
| 489 | } |
| 490 | |
| 491 | // bodyAllowedForStatus reports whether a response with the given |
| 492 | // status may include a body, per RFC 9110 §6.4.1. |
| 493 | func bodyAllowedForStatus(status int) bool { |
| 494 | switch { |
| 495 | case status >= 100 && status <= 199: |
| 496 | return false |
| 497 | case status == http.StatusNoContent: |
| 498 | return false |
| 499 | case status == http.StatusNotModified: |
| 500 | return false |
| 501 | } |
| 502 | return true |
| 503 | } |
| 504 | |
| 505 | // executeTemplate executes the template contained in wb.buf and replaces it with the results. |
| 506 | func (t *Templates) executeTemplate(rr caddyhttp.ResponseRecorder, r *http.Request) error { |
| 507 | var fs http.FileSystem |
| 508 | if t.FileRoot != "" { |
| 509 | repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer) |
| 510 | fs = http.Dir(repl.ReplaceAll(t.FileRoot, ".")) |
| 511 | } |
| 512 | |
| 513 | ctx := &TemplateContext{ |
| 514 | Root: fs, |
| 515 | Req: r, |
| 516 | RespHeader: WrappedHeader{rr.Header()}, |
| 517 | config: t, |
| 518 | CustomFuncs: t.customFuncs, |
| 519 | } |
| 520 | |
| 521 | err := ctx.executeTemplateInBuffer(r.URL.Path, rr.Buffer()) |
| 522 | if err != nil { |
| 523 | // Delete some headers that may have been set by the underlying |
| 524 | // handler (such as file_server) which may break the error response. |
| 525 | rr.Header().Del("Content-Length") |
| 526 | rr.Header().Del("Content-Type") |
| 527 | rr.Header().Del("Etag") |
| 528 | rr.Header().Del("Last-Modified") |
| 529 | rr.Header().Del("Accept-Ranges") |
| 530 | rr.Header().Del("Content-Encoding") |
| 531 | rr.Header().Del("Content-Range") |
| 532 | |
| 533 | // templates may return a custom HTTP error to be propagated to the client, |
| 534 | // otherwise for any other error we assume the template is broken |
| 535 | if handlerErr, ok := errors.AsType[caddyhttp.HandlerError](err); ok { |
| 536 | return handlerErr |
| 537 | } |
| 538 | return caddyhttp.Error(http.StatusInternalServerError, err) |
| 539 | } |
| 540 | |
| 541 | return nil |
| 542 | } |
| 543 | |
| 544 | // virtualResponseWriter is used in virtualized HTTP requests |
| 545 | // that templates may execute. |
| 546 | type virtualResponseWriter struct { |
| 547 | status int |
| 548 | header http.Header |
| 549 | body *bytes.Buffer |
| 550 | } |
| 551 | |
| 552 | func (vrw *virtualResponseWriter) Header() http.Header { |
| 553 | return vrw.header |
| 554 | } |
| 555 | |
| 556 | func (vrw *virtualResponseWriter) WriteHeader(statusCode int) { |
| 557 | vrw.status = statusCode |
| 558 | } |
| 559 | |
| 560 | func (vrw *virtualResponseWriter) Write(data []byte) (int, error) { |
| 561 | return vrw.body.Write(data) |
| 562 | } |
| 563 | |
| 564 | var defaultMIMETypes = []string{ |
| 565 | "text/html", |
| 566 | "text/plain", |
| 567 | "text/markdown", |
| 568 | } |
| 569 | |
| 570 | // Interface guards |
| 571 | var ( |
| 572 | _ caddy.Provisioner = (*Templates)(nil) |
| 573 | _ caddy.Validator = (*Templates)(nil) |
| 574 | _ caddyhttp.MiddlewareHandler = (*Templates)(nil) |
| 575 | ) |