package problem import ( "encoding/xml" "fmt" "net/http" "slices" "text/template" ) type Problem interface { Type() string Title() string Status() int Detail() string Instance() string Handler(self Problem) http.Handler http.Handler } type RegisteredProblem struct { TypeURI string `json:"type,omitempty" xml:"type,omitempty"` TypeTitle string `json:"title,omitempty" xml:"title,omitempty"` StatusCode int `json:"status,omitempty" xml:"status,omitempty"` DetailMessage string `json:"detail,omitempty" xml:"detail,omitempty"` InstanceURI string `json:"instance,omitempty" xml:"instance,omitempty"` XMLName xml.Name `json:"-" xml:"problem"` handler Handler `json:"-" xml:"-"` } func NewStatus(s int, opts ...Option) RegisteredProblem { return New(slices.Concat([]Option{WithStatus(s)}, opts)...) } func NewDetailed(s int, detail string, opts ...Option) RegisteredProblem { return New(slices.Concat([]Option{WithStatus(s), WithDetail(detail)}, opts)...) } func New(opts ...Option) RegisteredProblem { p := RegisteredProblem{ TypeURI: DefaultTypeURI, handler: DefaultHandler, } for _, opt := range opts { opt(&p) } return p } var ( DefaultTypeURI = "about:blank" DefaultTemplate = template.Must(template.New("x-smalltrip-problem-template").Parse(` {{ .Status }} - {{ .Title }}

{{.Status}} - {{ .Title }}

{{ .Type }}

Instance: {{ .Instance }}

{{printf "%#v" .}}
	

`))
	DefaultHandler = HandlerMiddleware(HandlerBrowser(DefaultTemplate))
)

func (p RegisteredProblem) Type() string {
	return p.TypeURI
}

func (p RegisteredProblem) Title() string {
	return p.TypeTitle
}

func (p RegisteredProblem) Status() int {
	return p.StatusCode
}

func (p RegisteredProblem) Detail() string {
	return p.DetailMessage
}

func (p RegisteredProblem) Instance() string {
	return p.InstanceURI
}

func (p RegisteredProblem) Handler(self Problem) http.Handler {
	return p.handler(self)
}

func (p RegisteredProblem) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	p.Handler(p).ServeHTTP(w, r)
}

func WithType(t string) Option {
	return func(p *RegisteredProblem) {
		p.TypeURI = t
	}
}

func WithTitle(t string) Option {
	return func(p *RegisteredProblem) {
		p.TypeTitle = t
	}
}

func WithStatus(s int) Option {
	return func(p *RegisteredProblem) {
		if p.TypeTitle == "" {
			p.TypeTitle = http.StatusText(s)
		}
		p.StatusCode = s
	}
}

func WithDetail(d string) Option {
	return func(p *RegisteredProblem) {
		p.DetailMessage = d
	}
}

func WithDetailf(f string, args ...any) Option {
	return func(p *RegisteredProblem) {
		p.DetailMessage = fmt.Sprintf(f, args...)
	}
}

func WithError(err error) Option {
	return func(p *RegisteredProblem) {
		p.DetailMessage = err.Error()
	}
}

func WithInstance(i string) Option {
	return func(p *RegisteredProblem) {
		p.InstanceURI = i
	}
}

type Option func(*RegisteredProblem)