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https://github.com/umputun/reproxy.git
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5743109210
* add support of html error reporting with custom templates * typo * formatting * better template load error msg
75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
package proxy
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import (
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"html/template"
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"log"
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"net/http"
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"sync"
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)
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// ErrorReporter formats error with a given template
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// Supports go-style template with {{.ErrMessage}} and {{.ErrCode}}
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type ErrorReporter struct {
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Template string
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Nice bool
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tmpl struct {
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*template.Template
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sync.Once
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}
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}
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// Report formats and sends error to ResponseWriter
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func (em *ErrorReporter) Report(w http.ResponseWriter, code int) {
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em.tmpl.Do(func() {
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if em.Template == "" {
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em.Template = errDefaultTemplate
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}
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tp, err := template.New("errmsg").Parse(em.Template)
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if err != nil {
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log.Printf("[WARN] failed to parse error template, %v", err)
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return
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}
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em.tmpl.Template = tp
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})
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if em.tmpl.Template == nil || !em.Nice {
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http.Error(w, "Server error", code)
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return
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}
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data := struct {
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ErrMessage string
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ErrCode int
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}{
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ErrMessage: http.StatusText(code),
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ErrCode: code,
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}
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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w.Header().Set("X-Content-Type-Options", "nosniff")
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w.WriteHeader(code)
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_ = em.tmpl.Execute(w, &data)
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}
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var errDefaultTemplate = `
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<!doctype html>
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<title>{{.ErrMessage}}</title>
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<style>
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body { text-align: center; padding: 150px; }
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h1 { font-size: 50px; }
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body { font: 20px Helvetica, sans-serif; color: #333; }
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article { display: block; text-align: left; width: 650px; margin: 0 auto; }
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a { color: #dc8100; text-decoration: none; }
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a:hover { color: #333; text-decoration: none; }
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</style>
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<article>
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<h1>We’ll be back soon!</h1>
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<div>
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<p>Sorry for the inconvenience but we’re performing some maintenance at the moment. We’ll be back online shortly!</p>
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<p>— The Team</p>
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</div>
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</article>
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`
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