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package problem
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import (
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"encoding/xml"
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"fmt"
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"net/http"
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"slices"
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"text/template"
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)
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type Problem interface {
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Type() string
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Title() string
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Status() int
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Detail() string
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Instance() string
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Handler(self Problem) http.Handler
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http.Handler
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}
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type RegisteredProblem struct {
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TypeURI string `json:"type,omitempty" xml:"type,omitempty"`
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TypeTitle string `json:"title,omitempty" xml:"title,omitempty"`
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StatusCode int `json:"status,omitempty" xml:"status,omitempty"`
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DetailMessage string `json:"detail,omitempty" xml:"detail,omitempty"`
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InstanceURI string `json:"instance,omitempty" xml:"instance,omitempty"`
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XMLName xml.Name `json:"-" xml:"problem"`
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handler Handler `json:"-" xml:"-"`
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}
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func NewStatus(s int, opts ...Option) RegisteredProblem {
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return New(slices.Concat([]Option{WithStatus(s)}, opts)...)
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}
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func NewDetailed(s int, detail string, opts ...Option) RegisteredProblem {
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return New(slices.Concat([]Option{WithStatus(s), WithDetail(detail)}, opts)...)
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}
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func New(opts ...Option) RegisteredProblem {
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p := RegisteredProblem{
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TypeURI: DefaultTypeURI,
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handler: DefaultHandler,
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}
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for _, opt := range opts {
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opt(&p)
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}
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return p
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}
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var (
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DefaultTypeURI = "about:blank"
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DefaultTemplate = template.Must(template.New("x-smalltrip-problem-template").Parse(`
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<!DOCTYPE html>
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<html>
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<head>
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<title>{{ .Status }} - {{ .Title }}</title>
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</head>
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<body>
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<h1>{{.Status}} - {{ .Title }}</h1>
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<p><code>{{ .Type }}</code></p>
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<p>{{ .Detail }}</p>
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{{if .Instance}}
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<p>Instance: {{ .Instance }}</p>
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{{end}}
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<code>{{printf "%#v" .}}<code>
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</body>
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<html>
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`))
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DefaultHandler = HandlerMiddleware(HandlerBrowser(DefaultTemplate))
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)
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func (p RegisteredProblem) Type() string {
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return p.TypeURI
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}
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func (p RegisteredProblem) Title() string {
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return p.TypeTitle
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}
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func (p RegisteredProblem) Status() int {
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return p.StatusCode
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}
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func (p RegisteredProblem) Detail() string {
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return p.DetailMessage
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}
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func (p RegisteredProblem) Instance() string {
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return p.InstanceURI
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}
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func (p RegisteredProblem) Handler(self Problem) http.Handler {
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return p.handler(self)
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}
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func (p RegisteredProblem) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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p.Handler(p).ServeHTTP(w, r)
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}
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func WithType(t string) Option {
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return func(p *RegisteredProblem) {
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p.TypeURI = t
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}
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}
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func WithTitle(t string) Option {
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return func(p *RegisteredProblem) {
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p.TypeTitle = t
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}
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}
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func WithStatus(s int) Option {
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return func(p *RegisteredProblem) {
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if p.TypeTitle == "" {
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p.TypeTitle = http.StatusText(s)
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}
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p.StatusCode = s
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}
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}
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func WithDetail(d string) Option {
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return func(p *RegisteredProblem) {
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p.DetailMessage = d
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}
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}
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func WithDetailf(f string, args ...any) Option {
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return func(p *RegisteredProblem) {
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p.DetailMessage = fmt.Sprintf(f, args...)
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}
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}
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func WithError(err error) Option {
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return func(p *RegisteredProblem) {
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p.DetailMessage = err.Error()
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}
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}
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func WithInstance(i string) Option {
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return func(p *RegisteredProblem) {
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p.InstanceURI = i
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}
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}
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type Option func(*RegisteredProblem)
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