118 lines
3.5 KiB
Go
118 lines
3.5 KiB
Go
/*
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Copyright 2014 CoreOS, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package validate
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import (
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"fmt"
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"reflect"
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"github.com/coreos/coreos-cloudinit/config"
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)
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type rule func(config node, report *Report)
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// Rules contains all of the validation rules.
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var Rules []rule = []rule{
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checkStructure,
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checkValidity,
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}
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// checkStructure compares the provided config to the empty config.CloudConfig
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// structure. Each node is checked to make sure that it exists in the known
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// structure and that its type is compatible.
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func checkStructure(cfg node, report *Report) {
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g := NewNode(config.CloudConfig{}, NewContext([]byte{}))
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checkNodeStructure(cfg, g, report)
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}
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func checkNodeStructure(n, g node, r *Report) {
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if !isCompatible(n.Kind(), g.Kind()) {
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r.Warning(n.line, fmt.Sprintf("incorrect type for %q (want %s)", n.name, g.HumanType()))
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return
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}
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switch g.Kind() {
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case reflect.Struct:
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for _, cn := range n.children {
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if cg := g.Child(cn.name); cg.IsValid() {
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checkNodeStructure(cn, cg, r)
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} else {
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r.Warning(cn.line, fmt.Sprintf("unrecognized key %q", cn.name))
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}
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}
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case reflect.Slice:
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for _, cn := range n.children {
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var cg node
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c := g.Type().Elem()
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toNode(reflect.New(c).Elem().Interface(), context{}, &cg)
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checkNodeStructure(cn, cg, r)
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}
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case reflect.String, reflect.Int, reflect.Float64, reflect.Bool:
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default:
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panic(fmt.Sprintf("checkNodeStructure(): unhandled kind %s", g.Kind()))
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}
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}
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// checkValidity checks the value of every node in the provided config by
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// running config.AssertValid() on it.
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func checkValidity(cfg node, report *Report) {
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g := NewNode(config.CloudConfig{}, NewContext([]byte{}))
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checkNodeValidity(cfg, g, report)
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}
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func checkNodeValidity(n, g node, r *Report) {
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if err := config.AssertValid(n.Value, g.field.Tag.Get("valid")); err != nil {
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r.Error(n.line, fmt.Sprintf("invalid value %v", n.Value.Interface()))
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}
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switch g.Kind() {
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case reflect.Struct:
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for _, cn := range n.children {
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if cg := g.Child(cn.name); cg.IsValid() {
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checkNodeValidity(cn, cg, r)
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}
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}
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case reflect.Slice:
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for _, cn := range n.children {
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var cg node
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c := g.Type().Elem()
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toNode(reflect.New(c).Elem().Interface(), context{}, &cg)
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checkNodeValidity(cn, cg, r)
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}
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case reflect.String, reflect.Int, reflect.Float64, reflect.Bool:
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default:
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panic(fmt.Sprintf("checkNodeValidity(): unhandled kind %s", g.Kind()))
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}
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}
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// isCompatible determines if the type of kind n can be converted to the type
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// of kind g in the context of YAML. This is not an exhaustive list, but its
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// enough for the purposes of cloud-config validation.
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func isCompatible(n, g reflect.Kind) bool {
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switch g {
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case reflect.String:
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return n == reflect.String || n == reflect.Int || n == reflect.Float64 || n == reflect.Bool
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case reflect.Struct:
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return n == reflect.Struct || n == reflect.Map
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case reflect.Float64:
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return n == reflect.Float64 || n == reflect.Int
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case reflect.Bool, reflect.Slice, reflect.Int:
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return n == g
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default:
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panic(fmt.Sprintf("isCompatible(): unhandled kind %s", g))
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}
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}
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