Middleware to serve the swagger UI without the need to download/generate or maintain any static assets.

swagger_middleware.go

package docs

import (
    "github.com/go-openapi/runtime/middleware"
    "net/http"
    "strings"
)

func SwaggerMiddleware(handler http.Handler) http.Handler {
    var r middleware.RedocOpts
    // Overide default path to your swagger.json/swagger.yaml file
    r.SpecURL = "/docs/swagger.json"
    return middleware.Redoc(r, serverStatic(handler))
}

func serverStatic(handler http.Handler) http.Handler {
    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        // Shortcut helpers for swagger-ui
        if r.URL.Path == "/swagger-ui" || r.URL.Path == "/docs/" {
            http.Redirect(w, r, "/docs", http.StatusFound)
            return
        }
        // Serving swagger-ui
        if strings.Index(r.URL.Path, "/docs") == 0 {
            http.StripPrefix("/docs", http.FileServer(http.Dir("docs"))).ServeHTTP(w, r)
            return
        }
        handler.ServeHTTP(w, r)
    })
}