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package middleware
import (
"bytes"
"encoding/gob"
"fmt"
"net/http"
"path"
"strings"
)
const (
// constants that are common to all UI-serving middlewares
defaultDocsPath = "docs"
defaultDocsURL = "/swagger.json"
defaultDocsTitle = "API Documentation"
)
// uiOptions defines common options for UI serving middlewares.
type uiOptions struct {
// BasePath for the UI, defaults to: /
BasePath string
// Path combines with BasePath to construct the path to the UI, defaults to: "docs".
Path string
// SpecURL is the URL of the spec document.
//
// Defaults to: /swagger.json
SpecURL string
// Title for the documentation site, default to: API documentation
Title string
// Template specifies a custom template to serve the UI
Template string
}
// toCommonUIOptions converts any UI option type to retain the common options.
//
// This uses gob encoding/decoding to convert common fields from one struct to another.
func toCommonUIOptions(opts interface{}) uiOptions {
var buf bytes.Buffer
enc := gob.NewEncoder(&buf)
dec := gob.NewDecoder(&buf)
var o uiOptions
err := enc.Encode(opts)
if err != nil {
panic(err)
}
err = dec.Decode(&o)
if err != nil {
panic(err)
}
return o
}
func fromCommonToAnyOptions[T any](source uiOptions, target *T) {
var buf bytes.Buffer
enc := gob.NewEncoder(&buf)
dec := gob.NewDecoder(&buf)
err := enc.Encode(source)
if err != nil {
panic(err)
}
err = dec.Decode(target)
if err != nil {
panic(err)
}
}
// UIOption can be applied to UI serving middleware, such as Context.APIHandler or
// Context.APIHandlerSwaggerUI to alter the defaut behavior.
type UIOption func(*uiOptions)
func uiOptionsWithDefaults(opts []UIOption) uiOptions {
var o uiOptions
for _, apply := range opts {
apply(&o)
}
return o
}
// WithUIBasePath sets the base path from where to serve the UI assets.
//
// By default, Context middleware sets this value to the API base path.
func WithUIBasePath(base string) UIOption {
return func(o *uiOptions) {
if !strings.HasPrefix(base, "/") {
base = "/" + base
}
o.BasePath = base
}
}
// WithUIPath sets the path from where to serve the UI assets (i.e. /{basepath}/{path}.
func WithUIPath(pth string) UIOption {
return func(o *uiOptions) {
o.Path = pth
}
}
// WithUISpecURL sets the path from where to serve swagger spec document.
//
// This may be specified as a full URL or a path.
//
// By default, this is "/swagger.json"
func WithUISpecURL(specURL string) UIOption {
return func(o *uiOptions) {
o.SpecURL = specURL
}
}
// WithUITitle sets the title of the UI.
//
// By default, Context middleware sets this value to the title found in the API spec.
func WithUITitle(title string) UIOption {
return func(o *uiOptions) {
o.Title = title
}
}
// WithTemplate allows to set a custom template for the UI.
//
// UI middleware will panic if the template does not parse or execute properly.
func WithTemplate(tpl string) UIOption {
return func(o *uiOptions) {
o.Template = tpl
}
}
// EnsureDefaults in case some options are missing
func (r *uiOptions) EnsureDefaults() {
if r.BasePath == "" {
r.BasePath = "/"
}
if r.Path == "" {
r.Path = defaultDocsPath
}
if r.SpecURL == "" {
r.SpecURL = defaultDocsURL
}
if r.Title == "" {
r.Title = defaultDocsTitle
}
}
// serveUI creates a middleware that serves a templated asset as text/html.
func serveUI(pth string, assets []byte, next http.Handler) http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
if path.Clean(r.URL.Path) == pth {
rw.Header().Set(contentTypeHeader, "text/html; charset=utf-8")
rw.WriteHeader(http.StatusOK)
_, _ = rw.Write(assets)
return
}
if next != nil {
next.ServeHTTP(rw, r)
return
}
rw.Header().Set(contentTypeHeader, "text/plain")
rw.WriteHeader(http.StatusNotFound)
_, _ = rw.Write([]byte(fmt.Sprintf("%q not found", pth)))
})
}