fix(env): index out panic when env key is preifix (#1247)

config/env/env.go

@@ -31,7 +31,7 @@ func (e *env) load(envStrings []string) []*config.KeyValue {
 
 		if len(e.prefixs) > 0 {
 			p, ok := matchPrefix(e.prefixs, envstr)
-			if !ok {
+			if !ok || len(p) == len(k) {
 				continue
 			}
 			// trim prefix
@@ -41,10 +41,12 @@ func (e *env) load(envStrings []string) []*config.KeyValue {
 			}
 		}
 
-		kv = append(kv, &config.KeyValue{
-			Key:   k,
-			Value: []byte(v),
-		})
+		if len(k) != 0 {
+			kv = append(kv, &config.KeyValue{
+				Key:   k,
+				Value: []byte(v),
+			})
+		}
 	}
 	return kv
 }

config/env/env_test.go

@@ -49,6 +49,9 @@ func TestEnvWithPrefix(t *testing.T) {
 		prefix1 + "SERVICE_NAME": "kratos_app",
 		prefix2 + "ADDR":         "192.168.0.1",
 		prefix1 + "AGE":          "20",
+		// only prefix
+		prefix2:       "foo",
+		prefix2 + "_": "foo_",
 	}
 
 	for k, v := range envs {