commit 36a5346885defbdba9d9fd5f33a3806f7bdd0a70 Author: chapeau Date: Wed Feb 7 16:45:25 2024 +0100 Example app diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..6f30a3a --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +/example diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..d645695 --- /dev/null +++ b/LICENSE @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. Definitions. + + "License" shall mean the terms and conditions for use, reproduction, + and distribution as defined by Sections 1 through 9 of this document. + + "Licensor" shall mean the copyright owner or entity authorized by + the copyright owner that is granting the License. + + "Legal Entity" shall mean the union of the acting entity and all + other entities that control, are controlled by, or are under common + control with that entity. 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In no event and under no legal theory, + whether in tort (including negligence), contract, or otherwise, + unless required by applicable law (such as deliberate and grossly + negligent acts) or agreed to in writing, shall any Contributor be + liable to You for damages, including any direct, indirect, special, + incidental, or consequential damages of any character arising as a + result of this License or out of the use or inability to use the + Work (including but not limited to damages for loss of goodwill, + work stoppage, computer failure or malfunction, or any and all + other commercial damages or losses), even if such Contributor + has been advised of the possibility of such damages. + + 9. Accepting Warranty or Additional Liability. While redistributing + the Work or Derivative Works thereof, You may choose to offer, + and charge a fee for, acceptance of support, warranty, indemnity, + or other liability obligations and/or rights consistent with this + License. However, in accepting such obligations, You may act only + on Your own behalf and on Your sole responsibility, not on behalf + of any other Contributor, and only if You agree to indemnify, + defend, and hold each Contributor harmless for any liability + incurred by, or claims asserted against, such Contributor by reason + of your accepting any such warranty or additional liability. + + END OF TERMS AND CONDITIONS + + APPENDIX: How to apply the Apache License to your work. + + To apply the Apache License to your work, attach the following + boilerplate notice, with the fields enclosed by brackets "[]" + replaced with your own identifying information. (Don't include + the brackets!) The text should be enclosed in the appropriate + comment syntax for the file format. We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. diff --git a/README.md b/README.md new file mode 100644 index 0000000..eb72f41 --- /dev/null +++ b/README.md @@ -0,0 +1,9 @@ +# Example app from Dex + +This repo contains the example app from the Dex repository (https://github.com/dexidp/dex/tree/master/examples/example-app). + +We did not make any modification on it; + +## License + +The project is licensed under the [Apache License, Version 2.0](LICENSE). diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..b2ada2f --- /dev/null +++ b/go.mod @@ -0,0 +1,19 @@ +module example + +go 1.20 + +require ( + github.com/coreos/go-oidc/v3 v3.9.0 + github.com/spf13/cobra v1.8.0 + golang.org/x/oauth2 v0.16.0 +) + +require ( + github.com/go-jose/go-jose/v3 v3.0.1 // indirect + github.com/golang/protobuf v1.5.3 // indirect + github.com/inconshreveable/mousetrap v1.1.0 // indirect + github.com/spf13/pflag v1.0.5 // indirect + golang.org/x/crypto v0.14.0 // indirect + google.golang.org/appengine v1.6.8 // indirect + google.golang.org/protobuf v1.31.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..064e14a --- /dev/null +++ b/go.sum @@ -0,0 +1,68 @@ +github.com/coreos/go-oidc/v3 v3.9.0 h1:0J/ogVOd4y8P0f0xUh8l9t07xRP/d8tccvjHl2dcsSo= +github.com/coreos/go-oidc/v3 v3.9.0/go.mod h1:rTKz2PYwftcrtoCzV5g5kvfJoWcm0Mk8AF8y1iAQro4= +github.com/cpuguy83/go-md2man/v2 v2.0.3/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o= +github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/go-jose/go-jose/v3 v3.0.1 h1:pWmKFVtt+Jl0vBZTIpz/eAKwsm6LkIxDVVbFHKkchhA= +github.com/go-jose/go-jose/v3 v3.0.1/go.mod h1:RNkWWRld676jZEYoV3+XK8L2ZnNSvIsxFMht0mSX+u8= +github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk= +github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY= +github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg= +github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY= +github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE= +github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE= +github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38= +github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8= +github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw= +github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= +github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= +github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM= +github.com/spf13/cobra v1.8.0 h1:7aJaZx1B85qltLMc546zn58BxxfZdR/W22ej9CFoEf0= +github.com/spf13/cobra v1.8.0/go.mod h1:WXLWApfZ71AjXPya3WOlMsY9yMs7YeiHhFVlvLyhcho= +github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA= +github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg= +github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= +github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg= +github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY= +github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY= +golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= +golang.org/x/crypto v0.0.0-20190911031432-227b76d455e7/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= +golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc= +golang.org/x/crypto v0.14.0 h1:wBqGXzWJW6m1XrIKlAH0Hs1JJ7+9KBwnIO8v66Q9cHc= +golang.org/x/crypto v0.14.0/go.mod h1:MVFd36DqK4CsrnJYDkBA3VC4m2GkXAM0PvzMCn4JQf4= +golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4= +golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= +golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= +golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg= +golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c= +golang.org/x/oauth2 v0.16.0 h1:aDkGMBSYxElaoP81NpoUoz2oo2R2wHdZpGToUxfyQrQ= +golang.org/x/oauth2 v0.16.0/go.mod h1:hqZ+0LWXsiVoZpeld6jVt06P3adbS2Uu911W1SsJv2o= +golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= +golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= +golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= +golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= +golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= +golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo= +golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8= +golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= +golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ= +golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ= +golang.org/x/text v0.3.8/go.mod h1:E6s5w1FMmriuDzIBO73fBruAKo1PCIq6d2Q6DHfQ8WQ= +golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= +golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo= +golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc= +golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= +golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= +google.golang.org/appengine v1.6.8 h1:IhEN5q69dyKagZPYMSdIjS2HqprW324FRQZJcGqPAsM= +google.golang.org/appengine v1.6.8/go.mod h1:1jJ3jBArFh5pcgW8gCtRJnepW8FzD1V44FJffLiz/Ds= +google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw= +google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc= +google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8= +google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I= +gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= +gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= diff --git a/main.go b/main.go new file mode 100644 index 0000000..451bea5 --- /dev/null +++ b/main.go @@ -0,0 +1,339 @@ +package main + +import ( + "bytes" + "context" + "crypto/tls" + "crypto/x509" + "encoding/json" + "errors" + "fmt" + "log" + "net" + "net/http" + "net/http/httputil" + "net/url" + "os" + "strings" + "time" + + "github.com/coreos/go-oidc/v3/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 := os.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()) +} diff --git a/templates.go b/templates.go new file mode 100644 index 0000000..a9425ea --- /dev/null +++ b/templates.go @@ -0,0 +1,110 @@ +package main + +import ( + "html/template" + "log" + "net/http" +) + +var indexTmpl = template.Must(template.New("index.html").Parse(` + + + + +
+

+ + +

+

+ + +

+

+ + +

+

+ + +

+

+ +

+
+ +`)) + +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(` + + + + +

ID Token: 

{{ .IDToken }}

+

Access Token: 

{{ .AccessToken }}

+

Claims: 

{{ .Claims }}

+ {{ if .RefreshToken }} +

Refresh Token: 

{{ .RefreshToken }}

+
+ + +
+ {{ end }} + + +`)) + +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. + } +}