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oauthutil: Use go template for web response

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Every response is formed using the AuthResponseData struct together with
the AuthResponse html template.
This commit is contained in:
Henning Surmeier 2018-06-03 23:49:11 +02:00 committed by Nick Craig-Wood
parent f1269dc06a
commit 04d18d2a07
1 changed files with 61 additions and 13 deletions
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74
lib/oauthutil/oauthutil.go
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@ -5,6 +5,7 @@ import (
"crypto/rand"
"encoding/json"
"fmt"
"html/template"
"log"
"net"
"net/http"
@ -40,6 +41,35 @@ const (
// RedirectLocalhostURL is redirect to local webserver when active with localhost
RedirectLocalhostURL = "http://localhost:" + bindPort + "/"
// AuthResponse is a template to handle the redirect URL for oauth requests
AuthResponse = `<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>{{ if .OK }}Success!{{ else }}Failure!{{ end }}</title>
</head>
<body>
<h1>{{ if .OK }}Success!{{ else }}Failure!{{ end }}</h1>
<hr>
<pre style="width: 750px; white-space: pre-wrap;">
{{ if eq .OK false }}
Error: {{ .AuthError.Name }}<br>
{{ if .AuthError.Description }}Description: {{ .AuthError.Description }}<br>{{ end }}
{{ if .AuthError.Code }}Code: {{ .AuthError.Code }}<br>{{ end }}
{{ if .AuthError.HelpURL }}Look here for help: <a href="{{ .AuthError.HelpURL }}">{{ .AuthError.HelpURL }}</a><br>{{ end }}
{{ else }}
{{ if .Code }}
Please copy this code into rclone:
{{ .Code }}
{{ else }}
All done. Please go back to rclone.
{{ end }}
{{ end }}
</pre>
</body>
</html>
`
)
// oldToken contains an end-user's tokens.
@ -429,6 +459,13 @@ type AuthError struct {
HelpURL string
}
// AuthResponseData can fill the AuthResponse template
type AuthResponseData struct {
OK bool // Failure or Success?
Code string // code to paste into rclone config
AuthError
}
// startWebServer runs an internal web server to receive config details
func (s *authServer) Start() {
fs.Debugf(nil, "Starting auth server on %s", s.bindAddress)
@ -451,31 +488,42 @@ func (s *authServer) Start() {
fs.Debugf(nil, "Received request on auth server")
code := req.FormValue("code")
var err error
var t = template.Must(template.New("authResponse").Parse(AuthResponse))
resp := AuthResponseData{AuthError: AuthError{}}
if code != "" {
state := req.FormValue("state")
if state != s.state {
fs.Debugf(nil, "State did not match: want %q got %q", s.state, state)
_, _ = fmt.Fprintf(w, "<h1>Failure</h1>\n<p>Auth state doesn't match</p>")
resp.OK = false
resp.AuthError = AuthError{
Name: "Auth State doesn't match",
}
} else {
fs.Debugf(nil, "Successfully got code")
if s.code != nil {
_, _ = fmt.Fprintf(w, "<h1>Success</h1>\n<p>Go back to rclone to continue</p>")
} else {
_, _ = fmt.Fprintf(w, "<h1>Success</h1>\n<p>Cut and paste this code into rclone: <code>%s</code></p>", code)
resp.OK = true
if s.code == nil {
resp.Code = code
}
}
} else {
fs.Debugf(nil, "No code found on request")
httpResponse := "<h1>Failed!</h1>\nNo code found returned by remote server."
if s.errorHandler != nil {
authError := s.errorHandler(req)
errorDesc := fmt.Sprintf("Error: %s\nCode: %s\nDescription: %s\nHelp: %s",
authError.Name, authError.Code, authError.Description, authError.HelpURL)
httpResponse += "\n<p>" + strings.Replace(errorDesc, "\n", "<br>", -1) + "</p>"
err = errors.New(errorDesc)
var authError AuthError
if s.errorHandler == nil {
authError = AuthError{
Name: "Auth Error",
Description: "No code found returned by remote server.",
}
} else {
authError = s.errorHandler(req)
}
err = fmt.Errorf("Error: %s\nCode: %s\nDescription: %s\nHelp: %s",
authError.Name, authError.Code, authError.Description, authError.HelpURL)
resp.OK = false
resp.AuthError = authError
w.WriteHeader(500)
_, _ = fmt.Fprintf(w, httpResponse)
}
if err := t.Execute(w, resp); err != nil {
fs.Debugf(nil, "Could not execute template for web response.")
}
if s.code != nil {
s.code <- code