oauth2/handler_fallback_endpoints.go from ory-am/hydra

oauth2/handler_fallback_endpoints.go
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// Copyright © 2022 Ory Corp
// SPDX-License-Identifier: Apache-2.0

package oauth2

import (
    "html/template"
    "net/http"

    "github.com/ory/hydra/v2/driver/config"

    "github.com/julienschmidt/httprouter"
)

func (h *Handler) fallbackHandler(title, heading string, sc int, configKey string) httprouter.Handle {
    if title == "" {
        title = "The request could not be executed because a mandatory configuration key is missing or malformed"
    }

    if heading == "" {
        heading = "The request could not be executed because a mandatory configuration key is missing or malformed"
    }

    return func(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
        h.r.Logger().Errorf(`A request failed because configuration key "%s" is missing or malformed.`, configKey)

        t, err := template.New(configKey).Parse(`<html>
<head>
    <title>{{ .Title }}</title>
</head>
<body>
<h1>
    {{ .Heading }}
</h1>
<p>
    You are seeing this page because configuration key <code>{{ .Key }}</code> is not set.
</p>
<p>
    If you are an administrator, please read <a href="https://www.ory.sh/docs">the guide</a> to understand what you
    need to do. If you are a user, please contact the administrator.
</p>
</body>
</html>`)
        if err != nil {
            h.r.Writer().WriteError(w, r, err)
            return
        }

        w.WriteHeader(sc)
        if err := t.Execute(w, struct {
            Title   string
            Heading string
            Key     string
        }{Title: title, Heading: heading, Key: configKey}); err != nil {
            h.r.Writer().WriteError(w, r, err)
            return
        }
    }
}

func (h *Handler) DefaultErrorHandler(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
    h.r.Logger().WithRequest(r).Error("A client requested the default error URL, environment variable URLS_ERROR is probably not set.")

    t, err := template.New("consent").Parse(`
<html>
<head>
    <title>An OAuth 2.0 Error Occurred</title>
</head>
<body>
<h1>
    The OAuth2 request resulted in an error.
</h1>
<ul>
    <li>Error: {{ .Name }}</li>
    <li>Description: {{ .Description }}</li>
    <li>Hint: {{ .Hint }}</li>
    <li>Debug: {{ .Debug }}</li>
</ul>
<p>
    You are seeing this page because configuration key <code>{{ .Key }}</code> is not set.
</p>
<p>
    If you are an administrator, please read <a href="https://www.ory.sh/docs">the guide</a> to understand what you
    need to do. If you are a user, please contact the administrator.
</p>
</body>
</html>
`)
    if err != nil {
        h.r.Writer().WriteError(w, r, err)
        return
    }

    w.WriteHeader(http.StatusInternalServerError)
    if err := t.Execute(w, struct {
        Name        string
        Description string
        Hint        string
        Debug       string
        Key         string
    }{
        Name:        r.URL.Query().Get("error"),
        Description: r.URL.Query().Get("error_description"),
        Hint:        r.URL.Query().Get("error_hint"),
        Debug:       r.URL.Query().Get("error_debug"),
        Key:         config.KeyErrorURL,
    }); err != nil {
        h.r.Writer().WriteError(w, r, err)
        return
    }
}