cmd: resolve issuer test issue (#522)

cmd/host.go

@@ -76,8 +76,9 @@ OAUTH2 CONTROLS
 - CONSENT_URL: The uri of the consent endpoint.
 	Example: CONSENT_URL=https://id.myapp.com/consent
 
-- ISSUER: The issuer is used for identification in all OAuth2 tokens. Should be the public url of the server.
-	Defaults to ISSUER=http://localhost:4444
+- ISSUER: Issuer is the public URL of your Hydra installation. It is used for OAuth2 and OpenID Connect and must be
+	specified and using HTTPS protocol, unless --dangerous-force-http is set.
+	Example: ISSUER=https://hydra.myapp.com/
 
 - AUTH_CODE_LIFESPAN: Lifespan of OAuth2 authorize codes. Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".
 	Defaults to AUTH_CODE_LIFESPAN=10m

cmd/root_test.go

@@ -20,6 +20,7 @@ func TestExecute(t *testing.T) {
 	var path = filepath.Join(os.TempDir(), fmt.Sprintf("hydra-%s.yml", uuid.New()))
 	os.Setenv("DATABASE_URL", "memory")
 	os.Setenv("FORCE_ROOT_CLIENT_CREDENTIALS", "admin:pw")
+	os.Setenv("ISSUER", "https://localhost:4444/")
 	copy(osArgs, os.Args)
 
 	for _, c := range []struct {

cmd/server/handler.go

@@ -40,12 +40,12 @@ func RunHost(c *config.Config) func(cmd *cobra.Command, args []string) {
 
 		if !c.ForceHTTP {
 			if c.Issuer == "" {
-				logger.Fatalln("Issuer must be explicitly specified unless --dangerous-force-http is passed.")
+				logger.Fatalln("Issuer must be explicitly specified unless --dangerous-force-http is passed. To find out more, use `hydra help host`.")
 			}
 			issuer, err := url.Parse(c.Issuer)
 			pkg.Must(err, "Could not parse issuer URL: %s", err)
 			if issuer.Scheme != "https" {
-				logger.Fatalln("Issuer must use HTTPS unless --dangerous-force-http is passed.")
+				logger.Fatalln("Issuer must use HTTPS unless --dangerous-force-http is passed. To find out more, use `hydra help host`.")
 			}
 		}