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// Package templates implements template execution for files to be dynamically rendered for the client.
package templates
import (
"bytes"
"net/http"
"os"
"path"
"path/filepath"
"text/template"
"github.com/mholt/caddy/middleware"
)
// ServeHTTP implements the middleware.Handler interface.
func (t Templates) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
for _, rule := range t.Rules {
if !middleware.Path(r.URL.Path).Matches(rule.Path) {
continue
}
// Check for index files
fpath := r.URL.Path
if idx, ok := middleware.IndexFile(t.FileSys, fpath, rule.IndexFiles); ok {
fpath = idx
}
// Check the extension
reqExt := path.Ext(fpath)
for _, ext := range rule.Extensions {
if reqExt == ext {
// Create execution context
ctx := middleware.Context{Root: t.FileSys, Req: r, URL: r.URL}
// Build the template
tpl, err := template.ParseFiles(filepath.Join(t.Root, fpath))
if err != nil {
if os.IsNotExist(err) {
return http.StatusNotFound, nil
} else if os.IsPermission(err) {
return http.StatusForbidden, nil
}
return http.StatusInternalServerError, err
}
// Execute it
var buf bytes.Buffer
err = tpl.Execute(&buf, ctx)
if err != nil {
return http.StatusInternalServerError, err
}
buf.WriteTo(w)
return http.StatusOK, nil
}
}
}
return t.Next.ServeHTTP(w, r)
}
// Templates is middleware to render templated files as the HTTP response.
type Templates struct {
Next middleware.Handler
Rules []Rule
Root string
FileSys http.FileSystem
}
// Rule represents a template rule. A template will only execute
// with this rule if the request path matches the Path specified
// and requests a resource with one of the extensions specified.
type Rule struct {
Path string
Extensions []string
IndexFiles []string
}
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