LinkedIn OAuth support.

README.md

@@ -33,8 +33,9 @@ providers to validate individual accounts, or a whole google apps domain.
 
 You will need to register an OAuth application with Google (or [another
 provider](#providers)), and configure it with Redirect URI(s) for the domain
-you intend to run `google_auth_proxy` on. For Google, the registration steps
-are:
+you intend to run `google_auth_proxy` on.
+
+For Google, the registration steps are:
 
 1. Create a new project: https://console.developers.google.com/project
 2. Under "APIs & Auth", choose "Credentials"
@@ -47,6 +48,14 @@ are:
    * Fill in the necessary fields and Save (this is _required_)
 5. Take note of the **Client ID** and **Client Secret**
 
+For LinkedIn, the registration steps are:
+
+1. Create a new project: https://www.linkedin.com/secure/developer
+2. In the OAuth User Agreement section:
+   * In default scope, select r_basicprofile and r_emailaddress.
+   * In "OAuth 2.0 Redirect URLs", enter `https://internal.yourcompany.com/oauth2/callback`
+3. Fill in the remaining required fields and Save.
+4. Take note of the **Consumer Key / API Key** and **Consumer Secret / Secret Key**
 
 ## Configuration
 
@@ -160,6 +169,7 @@ directive. Right now this includes:
 
 * `myusa` - The [MyUSA](https://alpha.my.usa.gov) authentication service
   ([GitHub](https://github.com/18F/myusa))
+* `linkedin` - The [LinkedIn](https://developer.linkedin.com/docs/signin-with-linkedin) Sign In service.
 
 ## Adding a new Provider
 

providers/linkedin.go

@@ -0,0 +1,68 @@
+package providers
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"log"
+	"net/http"
+	"net/url"
+
+	"github.com/bitly/go-simplejson"
+	"github.com/bitly/google_auth_proxy/api"
+)
+
+type LinkedInProvider struct {
+	*ProviderData
+}
+
+func NewLinkedInProvider(p *ProviderData) *LinkedInProvider {
+	p.ProviderName = "LinkedIn"
+	if p.LoginUrl.String() == "" {
+		p.LoginUrl = &url.URL{Scheme: "https",
+			Host: "www.linkedin.com",
+			Path: "/uas/oauth2/authorization"}
+	}
+	if p.RedeemUrl.String() == "" {
+		p.RedeemUrl = &url.URL{Scheme: "https",
+			Host: "www.linkedin.com",
+			Path: "/uas/oauth2/accessToken"}
+	}
+	if p.ProfileUrl.String() == "" {
+		p.ProfileUrl = &url.URL{Scheme: "https",
+			Host: "www.linkedin.com",
+			Path: "/v1/people/~/email-address"}
+	}
+	if p.Scope == "" {
+		p.Scope = "r_emailaddress r_basicprofile"
+	}
+	return &LinkedInProvider{ProviderData: p}
+}
+
+func (p *LinkedInProvider) GetEmailAddress(unused_auth_response *simplejson.Json,
+	access_token string) (string, error) {
+	if access_token == "" {
+		return "", errors.New("missing access token")
+	}
+	params := url.Values{}
+	req, err := http.NewRequest("GET", p.ProfileUrl.String()+"?format=json", bytes.NewBufferString(params.Encode()))
+	if err != nil {
+		return "", err
+	}
+	req.Header.Set("Accept", "application/json")
+	req.Header.Set("x-li-format", "json")
+	req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", access_token))
+
+	json, err := api.Request(req)
+	if err != nil {
+		log.Printf("failed making request %s", err)
+		return "", err
+	}
+
+	email, err := json.String()
+	if err != nil {
+		log.Printf("failed making request %s", err)
+		return "", err
+	}
+	return email, nil
+}

providers/linkedin_test.go

@@ -0,0 +1,128 @@
+package providers
+
+import (
+	"github.com/bitly/go-simplejson"
+	"github.com/bmizerany/assert"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"testing"
+)
+
+func testLinkedInProvider(hostname string) *LinkedInProvider {
+	p := NewLinkedInProvider(
+		&ProviderData{
+			ProviderName: "",
+			LoginUrl:     &url.URL{},
+			RedeemUrl:    &url.URL{},
+			ProfileUrl:   &url.URL{},
+			Scope:        ""})
+	if hostname != "" {
+		updateUrl(p.Data().LoginUrl, hostname)
+		updateUrl(p.Data().RedeemUrl, hostname)
+		updateUrl(p.Data().ProfileUrl, hostname)
+	}
+	return p
+}
+
+func testLinkedInBackend(payload string) *httptest.Server {
+	path := "/v1/people/~/email-address"
+
+	return httptest.NewServer(http.HandlerFunc(
+		func(w http.ResponseWriter, r *http.Request) {
+			url := r.URL
+			if url.Path != path {
+				w.WriteHeader(404)
+			} else if r.Header.Get("Authorization") != "Bearer imaginary_access_token" {
+				w.WriteHeader(403)
+			} else {
+				w.WriteHeader(200)
+				w.Write([]byte(payload))
+			}
+		}))
+}
+
+func TestLinkedInProviderDefaults(t *testing.T) {
+	p := testLinkedInProvider("")
+	assert.NotEqual(t, nil, p)
+	assert.Equal(t, "LinkedIn", p.Data().ProviderName)
+	assert.Equal(t, "https://www.linkedin.com/uas/oauth2/authorization",
+		p.Data().LoginUrl.String())
+	assert.Equal(t, "https://www.linkedin.com/uas/oauth2/accessToken",
+		p.Data().RedeemUrl.String())
+	assert.Equal(t, "https://www.linkedin.com/v1/people/~/email-address",
+		p.Data().ProfileUrl.String())
+	assert.Equal(t, "r_emailaddress r_basicprofile", p.Data().Scope)
+}
+
+func TestLinkedInProviderOverrides(t *testing.T) {
+	p := NewLinkedInProvider(
+		&ProviderData{
+			LoginUrl: &url.URL{
+				Scheme: "https",
+				Host:   "example.com",
+				Path:   "/oauth/auth"},
+			RedeemUrl: &url.URL{
+				Scheme: "https",
+				Host:   "example.com",
+				Path:   "/oauth/token"},
+			ProfileUrl: &url.URL{
+				Scheme: "https",
+				Host:   "example.com",
+				Path:   "/oauth/profile"},
+			Scope: "profile"})
+	assert.NotEqual(t, nil, p)
+	assert.Equal(t, "LinkedIn", p.Data().ProviderName)
+	assert.Equal(t, "https://example.com/oauth/auth",
+		p.Data().LoginUrl.String())
+	assert.Equal(t, "https://example.com/oauth/token",
+		p.Data().RedeemUrl.String())
+	assert.Equal(t, "https://example.com/oauth/profile",
+		p.Data().ProfileUrl.String())
+	assert.Equal(t, "profile", p.Data().Scope)
+}
+
+func TestLinkedInProviderGetEmailAddress(t *testing.T) {
+	b := testLinkedInBackend(`"user@linkedin.com"`)
+	defer b.Close()
+
+	b_url, _ := url.Parse(b.URL)
+	p := testLinkedInProvider(b_url.Host)
+	unused_auth_response := simplejson.New()
+
+	email, err := p.GetEmailAddress(unused_auth_response,
+		"imaginary_access_token")
+	assert.Equal(t, nil, err)
+	assert.Equal(t, "user@linkedin.com", email)
+}
+
+func TestLinkedInProviderGetEmailAddressFailedRequest(t *testing.T) {
+	b := testLinkedInBackend("unused payload")
+	defer b.Close()
+
+	b_url, _ := url.Parse(b.URL)
+	p := testLinkedInProvider(b_url.Host)
+	unused_auth_response := simplejson.New()
+
+	// We'll trigger a request failure by using an unexpected access
+	// token. Alternatively, we could allow the parsing of the payload as
+	// JSON to fail.
+	email, err := p.GetEmailAddress(unused_auth_response,
+		"unexpected_access_token")
+	assert.NotEqual(t, nil, err)
+	assert.Equal(t, "", email)
+}
+
+func TestLinkedInProviderGetEmailAddressEmailNotPresentInPayload(t *testing.T) {
+	b := testLinkedInBackend("{\"foo\": \"bar\"}")
+	defer b.Close()
+
+	b_url, _ := url.Parse(b.URL)
+	p := testLinkedInProvider(b_url.Host)
+	unused_auth_response := simplejson.New()
+
+	email, err := p.GetEmailAddress(unused_auth_response,
+		"imaginary_access_token")
+	assert.NotEqual(t, nil, err)
+	assert.Equal(t, "", email)
+}

providers/providers.go

@@ -14,6 +14,8 @@ func New(provider string, p *ProviderData) Provider {
 	switch provider {
 	case "myusa":
 		return NewMyUsaProvider(p)
+	case "linkedin":
+		return NewLinkedInProvider(p)
 	default:
 		return NewGoogleProvider(p)
 	}