GET license endpoint (#3651)

* GET license endpoint

Signed-off-by: Spike Curtis <spike@coder.com>

* SDK GetLicenses -> Licenses

Signed-off-by: Spike Curtis <spike@coder.com>

Signed-off-by: Spike Curtis <spike@coder.com>

enterprise/coderd/licenses_internal_test.go

@@ -142,6 +142,76 @@ func TestPostLicense(t *testing.T) {
 	})
 }
 
+// these tests patch the map of license keys, so cannot be run in parallel
+// nolint:paralleltest
+func TestGetLicense(t *testing.T) {
+	pubKey, privKey, err := ed25519.GenerateKey(rand.Reader)
+	require.NoError(t, err)
+	keyID := "testing"
+	oldKeys := keys
+	defer func() {
+		t.Log("restoring keys")
+		keys = oldKeys
+	}()
+	keys = map[string]ed25519.PublicKey{keyID: pubKey}
+
+	t.Run("GET", func(t *testing.T) {
+		client := coderdtest.New(t, &coderdtest.Options{APIBuilder: NewEnterprise})
+		_ = coderdtest.CreateFirstUser(t, client)
+		ctx, cancel := context.WithTimeout(context.Background(), testutil.WaitLong)
+		defer cancel()
+
+		claims := &Claims{
+			RegisteredClaims: jwt.RegisteredClaims{
+				Issuer:    "test@coder.test",
+				IssuedAt:  jwt.NewNumericDate(time.Now()),
+				NotBefore: jwt.NewNumericDate(time.Now()),
+				ExpiresAt: jwt.NewNumericDate(time.Now().Add(2 * time.Hour)),
+			},
+			LicenseExpires: jwt.NewNumericDate(time.Now().Add(time.Hour)),
+			AccountType:    AccountTypeSalesforce,
+			AccountID:      "testing",
+			Version:        CurrentVersion,
+			Features: Features{
+				UserLimit: 0,
+				AuditLog:  1,
+			},
+		}
+		lic, err := makeLicense(claims, privKey, keyID)
+		require.NoError(t, err)
+		_, err = client.AddLicense(ctx, codersdk.AddLicenseRequest{
+			License: lic,
+		})
+		require.NoError(t, err)
+
+		// 2nd license
+		claims.AccountID = "testing2"
+		claims.Features.UserLimit = 200
+		lic2, err := makeLicense(claims, privKey, keyID)
+		require.NoError(t, err)
+		_, err = client.AddLicense(ctx, codersdk.AddLicenseRequest{
+			License: lic2,
+		})
+		require.NoError(t, err)
+
+		licenses, err := client.Licenses(ctx)
+		require.NoError(t, err)
+		require.Len(t, licenses, 2)
+		assert.Equal(t, int32(1), licenses[0].ID)
+		assert.Equal(t, "testing", licenses[0].Claims["account_id"])
+		assert.Equal(t, map[string]interface{}{
+			codersdk.FeatureUserLimit: json.Number("0"),
+			codersdk.FeatureAuditLog:  json.Number("1"),
+		}, licenses[0].Claims["features"])
+		assert.Equal(t, int32(2), licenses[1].ID)
+		assert.Equal(t, "testing2", licenses[1].Claims["account_id"])
+		assert.Equal(t, map[string]interface{}{
+			codersdk.FeatureUserLimit: json.Number("200"),
+			codersdk.FeatureAuditLog:  json.Number("1"),
+		}, licenses[1].Claims["features"])
+	})
+}
+
 func makeLicense(c *Claims, privateKey ed25519.PrivateKey, keyID string) (string, error) {
 	tok := jwt.NewWithClaims(jwt.SigningMethodEdDSA, c)
 	tok.Header[HeaderKeyID] = keyID