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Move the example app to th examples folder

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Signed-off-by: Mark Sagi-Kazar <mark.sagikazar@gmail.com>
This commit is contained in:
Mark Sagi-Kazar
2020-07-16 00:26:39 +02:00
parent cb46a28c3c
commit 6dadc26ca2
7 changed files with 193 additions and 7 deletions
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340
examples/example-app/main.go Normal file
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package main
import (
"bytes"
"context"
"crypto/tls"
"crypto/x509"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"log"
"net"
"net/http"
"net/http/httputil"
"net/url"
"os"
"strings"
"time"
"github.com/coreos/go-oidc"
"github.com/spf13/cobra"
"golang.org/x/oauth2"
)
const exampleAppState = "I wish to wash my irish wristwatch"
type app struct {
clientID string
clientSecret string
redirectURI string
verifier *oidc.IDTokenVerifier
provider *oidc.Provider
// Does the provider use "offline_access" scope to request a refresh token
// or does it use "access_type=offline" (e.g. Google)?
offlineAsScope bool
client *http.Client
}
// return an HTTP client which trusts the provided root CAs.
func httpClientForRootCAs(rootCAs string) (*http.Client, error) {
tlsConfig := tls.Config{RootCAs: x509.NewCertPool()}
rootCABytes, err := ioutil.ReadFile(rootCAs)
if err != nil {
return nil, fmt.Errorf("failed to read root-ca: %v", err)
}
if !tlsConfig.RootCAs.AppendCertsFromPEM(rootCABytes) {
return nil, fmt.Errorf("no certs found in root CA file %q", rootCAs)
}
return &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tlsConfig,
Proxy: http.ProxyFromEnvironment,
Dial: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}).Dial,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
},
}, nil
}
type debugTransport struct {
t http.RoundTripper
}
func (d debugTransport) RoundTrip(req *http.Request) (*http.Response, error) {
reqDump, err := httputil.DumpRequest(req, true)
if err != nil {
return nil, err
}
log.Printf("%s", reqDump)
resp, err := d.t.RoundTrip(req)
if err != nil {
return nil, err
}
respDump, err := httputil.DumpResponse(resp, true)
if err != nil {
resp.Body.Close()
return nil, err
}
log.Printf("%s", respDump)
return resp, nil
}
func cmd() *cobra.Command {
var (
a app
issuerURL string
listen string
tlsCert string
tlsKey string
rootCAs string
debug bool
)
c := cobra.Command{
Use: "example-app",
Short: "An example OpenID Connect client",
Long: "",
RunE: func(cmd *cobra.Command, args []string) error {
if len(args) != 0 {
return errors.New("surplus arguments provided")
}
u, err := url.Parse(a.redirectURI)
if err != nil {
return fmt.Errorf("parse redirect-uri: %v", err)
}
listenURL, err := url.Parse(listen)
if err != nil {
return fmt.Errorf("parse listen address: %v", err)
}
if rootCAs != "" {
client, err := httpClientForRootCAs(rootCAs)
if err != nil {
return err
}
a.client = client
}
if debug {
if a.client == nil {
a.client = &http.Client{
Transport: debugTransport{http.DefaultTransport},
}
} else {
a.client.Transport = debugTransport{a.client.Transport}
}
}
if a.client == nil {
a.client = http.DefaultClient
}
// TODO(ericchiang): Retry with backoff
ctx := oidc.ClientContext(context.Background(), a.client)
provider, err := oidc.NewProvider(ctx, issuerURL)
if err != nil {
return fmt.Errorf("failed to query provider %q: %v", issuerURL, err)
}
var s struct {
// What scopes does a provider support?
//
// See: https://openid.net/specs/openid-connect-discovery-1_0.html#ProviderMetadata
ScopesSupported []string `json:"scopes_supported"`
}
if err := provider.Claims(&s); err != nil {
return fmt.Errorf("failed to parse provider scopes_supported: %v", err)
}
if len(s.ScopesSupported) == 0 {
// scopes_supported is a "RECOMMENDED" discovery claim, not a required
// one. If missing, assume that the provider follows the spec and has
// an "offline_access" scope.
a.offlineAsScope = true
} else {
// See if scopes_supported has the "offline_access" scope.
a.offlineAsScope = func() bool {
for _, scope := range s.ScopesSupported {
if scope == oidc.ScopeOfflineAccess {
return true
}
}
return false
}()
}
a.provider = provider
a.verifier = provider.Verifier(&oidc.Config{ClientID: a.clientID})
http.HandleFunc("/", a.handleIndex)
http.HandleFunc("/login", a.handleLogin)
http.HandleFunc(u.Path, a.handleCallback)
switch listenURL.Scheme {
case "http":
log.Printf("listening on %s", listen)
return http.ListenAndServe(listenURL.Host, nil)
case "https":
log.Printf("listening on %s", listen)
return http.ListenAndServeTLS(listenURL.Host, tlsCert, tlsKey, nil)
default:
return fmt.Errorf("listen address %q is not using http or https", listen)
}
},
}
c.Flags().StringVar(&a.clientID, "client-id", "example-app", "OAuth2 client ID of this application.")
c.Flags().StringVar(&a.clientSecret, "client-secret", "ZXhhbXBsZS1hcHAtc2VjcmV0", "OAuth2 client secret of this application.")
c.Flags().StringVar(&a.redirectURI, "redirect-uri", "http://127.0.0.1:5555/callback", "Callback URL for OAuth2 responses.")
c.Flags().StringVar(&issuerURL, "issuer", "http://127.0.0.1:5556/dex", "URL of the OpenID Connect issuer.")
c.Flags().StringVar(&listen, "listen", "http://127.0.0.1:5555", "HTTP(S) address to listen at.")
c.Flags().StringVar(&tlsCert, "tls-cert", "", "X509 cert file to present when serving HTTPS.")
c.Flags().StringVar(&tlsKey, "tls-key", "", "Private key for the HTTPS cert.")
c.Flags().StringVar(&rootCAs, "issuer-root-ca", "", "Root certificate authorities for the issuer. Defaults to host certs.")
c.Flags().BoolVar(&debug, "debug", false, "Print all request and responses from the OpenID Connect issuer.")
return &c
}
func main() {
if err := cmd().Execute(); err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
os.Exit(2)
}
}
func (a *app) handleIndex(w http.ResponseWriter, r *http.Request) {
renderIndex(w)
}
func (a *app) oauth2Config(scopes []string) *oauth2.Config {
return &oauth2.Config{
ClientID: a.clientID,
ClientSecret: a.clientSecret,
Endpoint: a.provider.Endpoint(),
Scopes: scopes,
RedirectURL: a.redirectURI,
}
}
func (a *app) handleLogin(w http.ResponseWriter, r *http.Request) {
var scopes []string
if extraScopes := r.FormValue("extra_scopes"); extraScopes != "" {
scopes = strings.Split(extraScopes, " ")
}
var clients []string
if crossClients := r.FormValue("cross_client"); crossClients != "" {
clients = strings.Split(crossClients, " ")
}
for _, client := range clients {
scopes = append(scopes, "audience:server:client_id:"+client)
}
connectorID := ""
if id := r.FormValue("connector_id"); id != "" {
connectorID = id
}
authCodeURL := ""
scopes = append(scopes, "openid", "profile", "email")
if r.FormValue("offline_access") != "yes" {
authCodeURL = a.oauth2Config(scopes).AuthCodeURL(exampleAppState)
} else if a.offlineAsScope {
scopes = append(scopes, "offline_access")
authCodeURL = a.oauth2Config(scopes).AuthCodeURL(exampleAppState)
} else {
authCodeURL = a.oauth2Config(scopes).AuthCodeURL(exampleAppState, oauth2.AccessTypeOffline)
}
if connectorID != "" {
authCodeURL = authCodeURL + "&connector_id=" + connectorID
}
http.Redirect(w, r, authCodeURL, http.StatusSeeOther)
}
func (a *app) handleCallback(w http.ResponseWriter, r *http.Request) {
var (
err error
token *oauth2.Token
)
ctx := oidc.ClientContext(r.Context(), a.client)
oauth2Config := a.oauth2Config(nil)
switch r.Method {
case http.MethodGet:
// Authorization redirect callback from OAuth2 auth flow.
if errMsg := r.FormValue("error"); errMsg != "" {
http.Error(w, errMsg+": "+r.FormValue("error_description"), http.StatusBadRequest)
return
}
code := r.FormValue("code")
if code == "" {
http.Error(w, fmt.Sprintf("no code in request: %q", r.Form), http.StatusBadRequest)
return
}
if state := r.FormValue("state"); state != exampleAppState {
http.Error(w, fmt.Sprintf("expected state %q got %q", exampleAppState, state), http.StatusBadRequest)
return
}
token, err = oauth2Config.Exchange(ctx, code)
case http.MethodPost:
// Form request from frontend to refresh a token.
refresh := r.FormValue("refresh_token")
if refresh == "" {
http.Error(w, fmt.Sprintf("no refresh_token in request: %q", r.Form), http.StatusBadRequest)
return
}
t := &oauth2.Token{
RefreshToken: refresh,
Expiry: time.Now().Add(-time.Hour),
}
token, err = oauth2Config.TokenSource(ctx, t).Token()
default:
http.Error(w, fmt.Sprintf("method not implemented: %s", r.Method), http.StatusBadRequest)
return
}
if err != nil {
http.Error(w, fmt.Sprintf("failed to get token: %v", err), http.StatusInternalServerError)
return
}
rawIDToken, ok := token.Extra("id_token").(string)
if !ok {
http.Error(w, "no id_token in token response", http.StatusInternalServerError)
return
}
idToken, err := a.verifier.Verify(r.Context(), rawIDToken)
if err != nil {
http.Error(w, fmt.Sprintf("failed to verify ID token: %v", err), http.StatusInternalServerError)
return
}
accessToken, ok := token.Extra("access_token").(string)
if !ok {
http.Error(w, "no access_token in token response", http.StatusInternalServerError)
return
}
var claims json.RawMessage
if err := idToken.Claims(&claims); err != nil {
http.Error(w, fmt.Sprintf("error decoding ID token claims: %v", err), http.StatusInternalServerError)
return
}
buff := new(bytes.Buffer)
if err := json.Indent(buff, []byte(claims), "", " "); err != nil {
http.Error(w, fmt.Sprintf("error indenting ID token claims: %v", err), http.StatusInternalServerError)
return
}
renderToken(w, a.redirectURI, rawIDToken, accessToken, token.RefreshToken, buff.String())
}

96
examples/example-app/templates.go Normal file
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package main
import (
"html/template"
"log"
"net/http"
)
var indexTmpl = template.Must(template.New("index.html").Parse(`<html>
<body>
<form action="/login" method="post">
<p>
Authenticate for:<input type="text" name="cross_client" placeholder="list of client-ids">
</p>
<p>
Extra scopes:<input type="text" name="extra_scopes" placeholder="list of scopes">
</p>
<p>
Connector ID:<input type="text" name="connector_id" placeholder="connector id">
</p>
<p>
Request offline access:<input type="checkbox" name="offline_access" value="yes" checked>
</p>
<input type="submit" value="Login">
</form>
</body>
</html>`))
func renderIndex(w http.ResponseWriter) {
renderTemplate(w, indexTmpl, nil)
}
type tokenTmplData struct {
IDToken string
AccessToken string
RefreshToken string
RedirectURL string
Claims string
}
var tokenTmpl = template.Must(template.New("token.html").Parse(`<html>
<head>
<style>
/* make pre wrap */
pre {
white-space: pre-wrap; /* css-3 */
white-space: -moz-pre-wrap; /* Mozilla, since 1999 */
white-space: -pre-wrap; /* Opera 4-6 */
white-space: -o-pre-wrap; /* Opera 7 */
word-wrap: break-word; /* Internet Explorer 5.5+ */
}
</style>
</head>
<body>
<p> ID Token: <pre><code>{{ .IDToken }}</code></pre></p>
<p> Access Token: <pre><code>{{ .AccessToken }}</code></pre></p>
<p> Claims: <pre><code>{{ .Claims }}</code></pre></p>
{{ if .RefreshToken }}
<p> Refresh Token: <pre><code>{{ .RefreshToken }}</code></pre></p>
<form action="{{ .RedirectURL }}" method="post">
<input type="hidden" name="refresh_token" value="{{ .RefreshToken }}">
<input type="submit" value="Redeem refresh token">
</form>
{{ end }}
</body>
</html>
`))
func renderToken(w http.ResponseWriter, redirectURL, idToken, accessToken, refreshToken, claims string) {
renderTemplate(w, tokenTmpl, tokenTmplData{
IDToken: idToken,
AccessToken: accessToken,
RefreshToken: refreshToken,
RedirectURL: redirectURL,
Claims: claims,
})
}
func renderTemplate(w http.ResponseWriter, tmpl *template.Template, data interface{}) {
err := tmpl.Execute(w, data)
if err == nil {
return
}
switch err := err.(type) {
case *template.Error:
// An ExecError guarantees that Execute has not written to the underlying reader.
log.Printf("Error rendering template %s: %s", tmpl.Name(), err)
// TODO(ericchiang): replace with better internal server error.
http.Error(w, "Internal server error", http.StatusInternalServerError)
default:
// An error with the underlying write, such as the connection being
// dropped. Ignore for now.
}
}

13
examples/go.mod Normal file
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module github.com/dexidp/dex/examples
go 1.14
require (
github.com/coreos/go-oidc v2.2.1+incompatible
github.com/dexidp/dex/api/v2 v2.0.0-20200715135117-cb46a28c3ce2
github.com/pquerna/cachecontrol v0.0.0-20180517163645-1555304b9b35 // indirect
github.com/spf13/cobra v1.0.0
golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
google.golang.org/grpc v1.26.0
gopkg.in/square/go-jose.v2 v2.5.1 // indirect
)

169
examples/go.sum Normal file
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@@ -0,0 +1,169 @@
cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
github.com/coreos/go-oidc v2.2.1+incompatible h1:mh48q/BqXqgjVHpy2ZY7WnWAbenxRjsz9N1i1YxjHAk=
github.com/coreos/go-oidc v2.2.1+incompatible/go.mod h1:CgnwVTmzoESiwO9qyAFEMiHoZ1nMCKZlZ9V6mm3/LKc=
github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/dexidp/dex/api/v2 v2.0.0-20200715135117-cb46a28c3ce2 h1:7dhZfOv4rPQobAFxxWLnZB2bV9QxSHGnufXeCjzHEos=
github.com/dexidp/dex/api/v2 v2.0.0-20200715135117-cb46a28c3ce2/go.mod h1:k5arBJT1QYvpsEY3sEd0NXJp3hKWKuUUfzJ3BlcqPdM=
github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
github.com/google/go-cmp v0.2.0 h1:+dTQ8DZQJz0Mb/HjFlkptS1FeQ4cWSnN941F8aEG4SQ=
github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
github.com/grpc-ecosystem/go-grpc-middleware v1.0.0/go.mod h1:FiyG127CGDf3tlThmgyCl78X/SZQqEOJBCDaAfeWzPs=
github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgfV/d3M/q6VIi02HzZEHgUlZvzk=
github.com/grpc-ecosystem/grpc-gateway v1.9.0/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
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github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
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