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104 lines
2.4 KiB
104 lines
2.4 KiB
package middleware
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import (
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"bytes"
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"fmt"
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"html/template"
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"net/http"
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"path"
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)
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// RedocOpts configures the Redoc middlewares
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type RedocOpts struct {
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// BasePath for the UI path, defaults to: /
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BasePath string
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// Path combines with BasePath for the full UI path, defaults to: docs
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Path string
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// SpecURL the url to find the spec for
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SpecURL string
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// RedocURL for the js that generates the redoc site, defaults to: https://cdn.jsdelivr.net/npm/redoc/bundles/redoc.standalone.js
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RedocURL string
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// Title for the documentation site, default to: API documentation
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Title string
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}
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// EnsureDefaults in case some options are missing
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func (r *RedocOpts) EnsureDefaults() {
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if r.BasePath == "" {
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r.BasePath = "/"
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}
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if r.Path == "" {
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r.Path = "docs"
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}
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if r.SpecURL == "" {
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r.SpecURL = "/swagger.json"
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}
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if r.RedocURL == "" {
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r.RedocURL = redocLatest
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}
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if r.Title == "" {
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r.Title = "API documentation"
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}
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}
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// Redoc creates a middleware to serve a documentation site for a swagger spec.
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// This allows for altering the spec before starting the http listener.
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//
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func Redoc(opts RedocOpts, next http.Handler) http.Handler {
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opts.EnsureDefaults()
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pth := path.Join(opts.BasePath, opts.Path)
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tmpl := template.Must(template.New("redoc").Parse(redocTemplate))
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buf := bytes.NewBuffer(nil)
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_ = tmpl.Execute(buf, opts)
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b := buf.Bytes()
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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if r.URL.Path == pth {
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rw.Header().Set("Content-Type", "text/html; charset=utf-8")
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rw.WriteHeader(http.StatusOK)
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_, _ = rw.Write(b)
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return
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}
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if next == nil {
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rw.Header().Set("Content-Type", "text/plain")
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rw.WriteHeader(http.StatusNotFound)
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_, _ = rw.Write([]byte(fmt.Sprintf("%q not found", pth)))
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return
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}
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next.ServeHTTP(rw, r)
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})
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}
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const (
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redocLatest = "https://cdn.jsdelivr.net/npm/redoc/bundles/redoc.standalone.js"
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redocTemplate = `<!DOCTYPE html>
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<html>
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<head>
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<title>{{ .Title }}</title>
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<!-- needed for adaptive design -->
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<meta charset="utf-8"/>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link href="https://fonts.googleapis.com/css?family=Montserrat:300,400,700|Roboto:300,400,700" rel="stylesheet">
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<!--
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ReDoc doesn't change outer page styles
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-->
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<style>
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body {
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margin: 0;
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padding: 0;
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}
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</style>
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</head>
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<body>
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<redoc spec-url='{{ .SpecURL }}'></redoc>
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<script src="{{ .RedocURL }}"> </script>
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</body>
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</html>
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`
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)
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