providers: iterate across all pages from /user/orgs github endpoint.

For some GHE instances where a user can have more than 100
organizations, traversing the other pages is important otherwise
oauth2_proxy will consider the user unauthorized. This change traverses
the list returned by the API to avoid that.

Update github provider tests to include this case.

providers/github.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"net/url"
 	"path"
+	"strconv"
 	"strings"
 )
 
@@ -61,36 +62,51 @@ func (p *GitHubProvider) hasOrg(accessToken string) (bool, error) {
 		Login string `json:"login"`
 	}
 
-	params := url.Values{
-		"limit": {"100"},
+	type orgsPage []struct {
+		Login string `json:"login"`
 	}
 
-	endpoint := &url.URL{
-		Scheme:   p.ValidateURL.Scheme,
-		Host:     p.ValidateURL.Host,
-		Path:     path.Join(p.ValidateURL.Path, "/user/orgs"),
-		RawQuery: params.Encode(),
-	}
-	req, _ := http.NewRequest("GET", endpoint.String(), nil)
-	req.Header.Set("Accept", "application/vnd.github.v3+json")
-	req.Header.Set("Authorization", fmt.Sprintf("token %s", accessToken))
-	resp, err := http.DefaultClient.Do(req)
-	if err != nil {
-		return false, err
-	}
+	pn := 1
+	for {
+		params := url.Values{
+			"limit": {"200"},
+			"page":  {strconv.Itoa(pn)},
+		}
 
-	body, err := ioutil.ReadAll(resp.Body)
-	resp.Body.Close()
-	if err != nil {
-		return false, err
-	}
-	if resp.StatusCode != 200 {
-		return false, fmt.Errorf(
-			"got %d from %q %s", resp.StatusCode, endpoint.String(), body)
-	}
+		endpoint := &url.URL{
+			Scheme:   p.ValidateURL.Scheme,
+			Host:     p.ValidateURL.Host,
+			Path:     path.Join(p.ValidateURL.Path, "/user/orgs"),
+			RawQuery: params.Encode(),
+		}
+		req, _ := http.NewRequest("GET", endpoint.String(), nil)
+		req.Header.Set("Accept", "application/vnd.github.v3+json")
+		req.Header.Set("Authorization", fmt.Sprintf("token %s", accessToken))
+		resp, err := http.DefaultClient.Do(req)
+		if err != nil {
+			return false, err
+		}
 
-	if err := json.Unmarshal(body, &orgs); err != nil {
-		return false, err
+		body, err := ioutil.ReadAll(resp.Body)
+		resp.Body.Close()
+		if err != nil {
+			return false, err
+		}
+		if resp.StatusCode != 200 {
+			return false, fmt.Errorf(
+				"got %d from %q %s", resp.StatusCode, endpoint.String(), body)
+		}
+
+		var op orgsPage
+		if err := json.Unmarshal(body, &op); err != nil {
+			return false, err
+		}
+		if len(op) == 0 {
+			break
+		}
+
+		orgs = append(orgs, op...)
+		pn += 1
 	}
 
 	var presentOrgs []string
@@ -118,7 +134,7 @@ func (p *GitHubProvider) hasOrgAndTeam(accessToken string) (bool, error) {
 	}
 
 	params := url.Values{
-		"limit": {"100"},
+		"limit": {"200"},
 	}
 
 	endpoint := &url.URL{

providers/github_test.go

@@ -27,23 +27,32 @@ func testGitHubProvider(hostname string) *GitHubProvider {
 	return p
 }
 
-func testGitHubBackend(payload string) *httptest.Server {
-	pathToQueryMap := map[string]string{
-		"/user":        "",
-		"/user/emails": "",
+func testGitHubBackend(payload []string) *httptest.Server {
+	pathToQueryMap := map[string][]string{
+		"/user":        []string{""},
+		"/user/emails": []string{""},
+		"/user/orgs":   []string{"limit=200&page=1", "limit=200&page=2", "limit=200&page=3"},
 	}
 
 	return httptest.NewServer(http.HandlerFunc(
 		func(w http.ResponseWriter, r *http.Request) {
 			url := r.URL
 			query, ok := pathToQueryMap[url.Path]
+			validQuery := false
+			index := 0
+			for i, q := range query {
+				if q == url.RawQuery {
+					validQuery = true
+					index = i
+				}
+			}
 			if !ok {
 				w.WriteHeader(404)
-			} else if url.RawQuery != query {
+			} else if !validQuery {
 				w.WriteHeader(404)
 			} else {
 				w.WriteHeader(200)
-				w.Write([]byte(payload))
+				w.Write([]byte(payload[index]))
 			}
 		}))
 }
@@ -89,11 +98,29 @@ func TestGitHubProviderOverrides(t *testing.T) {
 }
 
 func TestGitHubProviderGetEmailAddress(t *testing.T) {
-	b := testGitHubBackend(`[ {"email": "michael.bland@gsa.gov", "primary": true} ]`)
+	b := testGitHubBackend([]string{`[ {"email": "michael.bland@gsa.gov", "primary": true} ]`})
+	defer b.Close()
+
+	bURL, _ := url.Parse(b.URL)
+	p := testGitHubProvider(bURL.Host)
+
+	session := &SessionState{AccessToken: "imaginary_access_token"}
+	email, err := p.GetEmailAddress(session)
+	assert.Equal(t, nil, err)
+	assert.Equal(t, "michael.bland@gsa.gov", email)
+}
+
+func TestGitHubProviderGetEmailAddressWithOrg(t *testing.T) {
+	b := testGitHubBackend([]string{
+		`[ {"email": "michael.bland@gsa.gov", "primary": true, "login":"testorg"} ]`,
+		`[ {"email": "michael.bland1@gsa.gov", "primary": true, "login":"testorg1"} ]`,
+		`[ ]`,
+	})
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
 	p := testGitHubProvider(bURL.Host)
+	p.Org = "testorg1"
 
 	session := &SessionState{AccessToken: "imaginary_access_token"}
 	email, err := p.GetEmailAddress(session)
@@ -104,7 +131,7 @@ func TestGitHubProviderGetEmailAddress(t *testing.T) {
 // Note that trying to trigger the "failed building request" case is not
 // practical, since the only way it can fail is if the URL fails to parse.
 func TestGitHubProviderGetEmailAddressFailedRequest(t *testing.T) {
-	b := testGitHubBackend("unused payload")
+	b := testGitHubBackend([]string{"unused payload"})
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
@@ -120,7 +147,7 @@ func TestGitHubProviderGetEmailAddressFailedRequest(t *testing.T) {
 }
 
 func TestGitHubProviderGetEmailAddressEmailNotPresentInPayload(t *testing.T) {
-	b := testGitHubBackend("{\"foo\": \"bar\"}")
+	b := testGitHubBackend([]string{"{\"foo\": \"bar\"}"})
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)
@@ -133,7 +160,7 @@ func TestGitHubProviderGetEmailAddressEmailNotPresentInPayload(t *testing.T) {
 }
 
 func TestGitHubProviderGetUserName(t *testing.T) {
-	b := testGitHubBackend(`{"email": "michael.bland@gsa.gov", "login": "mbland"}`)
+	b := testGitHubBackend([]string{`{"email": "michael.bland@gsa.gov", "login": "mbland"}`})
 	defer b.Close()
 
 	bURL, _ := url.Parse(b.URL)