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163 lines
3.8 KiB
163 lines
3.8 KiB
4 years ago
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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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// SwaggerUIOpts configures the Swaggerui middlewares
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type SwaggerUIOpts 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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// The three components needed to embed swagger-ui
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SwaggerURL string
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SwaggerPresetURL string
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SwaggerStylesURL string
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Favicon32 string
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Favicon16 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 *SwaggerUIOpts) 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.SwaggerURL == "" {
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r.SwaggerURL = swaggerLatest
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}
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if r.SwaggerPresetURL == "" {
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r.SwaggerPresetURL = swaggerPresetLatest
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}
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if r.SwaggerStylesURL == "" {
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r.SwaggerStylesURL = swaggerStylesLatest
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}
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if r.Favicon16 == "" {
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r.Favicon16 = swaggerFavicon16Latest
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}
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if r.Favicon32 == "" {
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r.Favicon32 = swaggerFavicon32Latest
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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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// SwaggerUI 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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func SwaggerUI(opts SwaggerUIOpts, 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("swaggerui").Parse(swaggeruiTemplate))
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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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swaggerLatest = "https://unpkg.com/swagger-ui-dist/swagger-ui-bundle.js"
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swaggerPresetLatest = "https://unpkg.com/swagger-ui-dist/swagger-ui-standalone-preset.js"
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swaggerStylesLatest = "https://unpkg.com/swagger-ui-dist/swagger-ui.css"
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swaggerFavicon32Latest = "https://unpkg.com/swagger-ui-dist/favicon-32x32.png"
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swaggerFavicon16Latest = "https://unpkg.com/swagger-ui-dist/favicon-16x16.png"
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swaggeruiTemplate = `
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>{{ .Title }}</title>
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<link rel="stylesheet" type="text/css" href="{{ .SwaggerStylesURL }}" >
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<link rel="icon" type="image/png" href="{{ .Favicon32 }}" sizes="32x32" />
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<link rel="icon" type="image/png" href="{{ .Favicon16 }}" sizes="16x16" />
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<style>
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html
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{
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box-sizing: border-box;
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overflow: -moz-scrollbars-vertical;
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overflow-y: scroll;
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}
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*,
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*:before,
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*:after
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{
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box-sizing: inherit;
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}
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body
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{
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margin:0;
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background: #fafafa;
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}
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</style>
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</head>
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<body>
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<div id="swagger-ui"></div>
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<script src="{{ .SwaggerURL }}"> </script>
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<script src="{{ .SwaggerPresetURL }}"> </script>
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<script>
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window.onload = function() {
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// Begin Swagger UI call region
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const ui = SwaggerUIBundle({
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url: '{{ .SpecURL }}',
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dom_id: '#swagger-ui',
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deepLinking: true,
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presets: [
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SwaggerUIBundle.presets.apis,
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SwaggerUIStandalonePreset
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],
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plugins: [
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SwaggerUIBundle.plugins.DownloadUrl
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],
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layout: "StandaloneLayout"
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})
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// End Swagger UI call region
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window.ui = ui
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}
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</script>
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</body>
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</html>
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`
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)
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