traefik/vendor/github.com/docker/libcompose/config/validation.go

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package config
import (
"fmt"
"strconv"
"strings"
"github.com/docker/libcompose/utils"
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"github.com/xeipuuv/gojsonschema"
)
func serviceNameFromErrorField(field string) string {
splitKeys := strings.Split(field, ".")
return splitKeys[0]
}
func keyNameFromErrorField(field string) string {
splitKeys := strings.Split(field, ".")
if len(splitKeys) > 0 {
return splitKeys[len(splitKeys)-1]
}
return ""
}
func containsTypeError(resultError gojsonschema.ResultError) bool {
contextSplit := strings.Split(resultError.Context().String(), ".")
_, err := strconv.Atoi(contextSplit[len(contextSplit)-1])
return err == nil
}
func addArticle(s string) string {
switch s[0] {
case 'a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U':
return "an " + s
default:
return "a " + s
}
}
// Gets the value in a service map at a given error context
func getValue(val interface{}, context string) string {
keys := strings.Split(context, ".")
if keys[0] == "(root)" {
keys = keys[1:]
}
for i, k := range keys {
switch typedVal := (val).(type) {
case string:
return typedVal
case []interface{}:
if index, err := strconv.Atoi(k); err == nil {
val = typedVal[index]
}
case RawServiceMap:
val = typedVal[k]
case RawService:
val = typedVal[k]
case map[interface{}]interface{}:
val = typedVal[k]
}
if i == len(keys)-1 {
return fmt.Sprint(val)
}
}
return ""
}
func convertServiceMapKeysToStrings(serviceMap RawServiceMap) RawServiceMap {
newServiceMap := make(RawServiceMap)
for k, v := range serviceMap {
newServiceMap[k] = convertServiceKeysToStrings(v)
}
return newServiceMap
}
func convertServiceKeysToStrings(service RawService) RawService {
newService := make(RawService)
for k, v := range service {
newService[k] = utils.ConvertKeysToStrings(v)
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}
return newService
}
var dockerConfigHints = map[string]string{
"cpu_share": "cpu_shares",
"add_host": "extra_hosts",
"hosts": "extra_hosts",
"extra_host": "extra_hosts",
"device": "devices",
"link": "links",
"memory_swap": "memswap_limit",
"port": "ports",
"privilege": "privileged",
"priviliged": "privileged",
"privilige": "privileged",
"volume": "volumes",
"workdir": "working_dir",
}
func unsupportedConfigMessage(key string, nextErr gojsonschema.ResultError) string {
service := serviceNameFromErrorField(nextErr.Field())
message := fmt.Sprintf("Unsupported config option for %s service: '%s'", service, key)
if val, ok := dockerConfigHints[key]; ok {
message += fmt.Sprintf(" (did you mean '%s'?)", val)
}
return message
}
func oneOfMessage(serviceMap RawServiceMap, schema map[string]interface{}, err, nextErr gojsonschema.ResultError) string {
switch nextErr.Type() {
case "additional_property_not_allowed":
property := nextErr.Details()["property"]
return fmt.Sprintf("contains unsupported option: '%s'", property)
case "invalid_type":
if containsTypeError(nextErr) {
expectedType := addArticle(nextErr.Details()["expected"].(string))
return fmt.Sprintf("contains %s, which is an invalid type, it should be %s", getValue(serviceMap, nextErr.Context().String()), expectedType)
}
validTypes := parseValidTypesFromSchema(schema, err.Context().String())
validTypesMsg := addArticle(strings.Join(validTypes, " or "))
return fmt.Sprintf("contains an invalid type, it should be %s", validTypesMsg)
case "unique":
contextWithDuplicates := getValue(serviceMap, nextErr.Context().String())
return fmt.Sprintf("contains non unique items, please remove duplicates from %s", contextWithDuplicates)
}
return ""
}
func invalidTypeMessage(service, key string, err gojsonschema.ResultError) string {
expectedTypesString := err.Details()["expected"].(string)
var expectedTypes []string
if strings.Contains(expectedTypesString, ",") {
expectedTypes = strings.Split(expectedTypesString[1:len(expectedTypesString)-1], ",")
} else {
expectedTypes = []string{expectedTypesString}
}
validTypesMsg := addArticle(strings.Join(expectedTypes, " or "))
return fmt.Sprintf("Service '%s' configuration key '%s' contains an invalid type, it should be %s.", service, key, validTypesMsg)
}
func validate(serviceMap RawServiceMap) error {
serviceMap = convertServiceMapKeysToStrings(serviceMap)
dataLoader := gojsonschema.NewGoLoader(serviceMap)
result, err := gojsonschema.Validate(schemaLoaderV1, dataLoader)
if err != nil {
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return err
}
return generateErrorMessages(serviceMap, schemaV1, result)
}
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func validateV2(serviceMap RawServiceMap) error {
serviceMap = convertServiceMapKeysToStrings(serviceMap)
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dataLoader := gojsonschema.NewGoLoader(serviceMap)
result, err := gojsonschema.Validate(schemaLoaderV2, dataLoader)
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if err != nil {
return err
}
return generateErrorMessages(serviceMap, schemaV2, result)
}
func generateErrorMessages(serviceMap RawServiceMap, schema map[string]interface{}, result *gojsonschema.Result) error {
var validationErrors []string
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// gojsonschema can create extraneous "additional_property_not_allowed" errors in some cases
// If this is set, and the error is at root level, skip over that error
skipRootAdditionalPropertyError := false
if !result.Valid() {
for i := 0; i < len(result.Errors()); i++ {
err := result.Errors()[i]
if skipRootAdditionalPropertyError && err.Type() == "additional_property_not_allowed" && err.Context().String() == "(root)" {
skipRootAdditionalPropertyError = false
continue
}
if err.Context().String() == "(root)" {
switch err.Type() {
case "additional_property_not_allowed":
validationErrors = append(validationErrors, fmt.Sprintf("Invalid service name '%s' - only [a-zA-Z0-9\\._\\-] characters are allowed", err.Field()))
default:
validationErrors = append(validationErrors, err.Description())
}
} else {
skipRootAdditionalPropertyError = true
serviceName := serviceNameFromErrorField(err.Field())
key := keyNameFromErrorField(err.Field())
switch err.Type() {
case "additional_property_not_allowed":
validationErrors = append(validationErrors, unsupportedConfigMessage(key, result.Errors()[i+1]))
case "number_one_of":
validationErrors = append(validationErrors, fmt.Sprintf("Service '%s' configuration key '%s' %s", serviceName, key, oneOfMessage(serviceMap, schema, err, result.Errors()[i+1])))
// Next error handled in oneOfMessage, skip over it
i++
case "invalid_type":
validationErrors = append(validationErrors, invalidTypeMessage(serviceName, key, err))
case "required":
validationErrors = append(validationErrors, fmt.Sprintf("Service '%s' option '%s' is invalid, %s", serviceName, key, err.Description()))
case "missing_dependency":
dependency := err.Details()["dependency"].(string)
validationErrors = append(validationErrors, fmt.Sprintf("Invalid configuration for '%s' service: dependency '%s' is not satisfied", serviceName, dependency))
case "unique":
contextWithDuplicates := getValue(serviceMap, err.Context().String())
validationErrors = append(validationErrors, fmt.Sprintf("Service '%s' configuration key '%s' value %s has non-unique elements", serviceName, key, contextWithDuplicates))
default:
validationErrors = append(validationErrors, fmt.Sprintf("Service '%s' configuration key %s value %s", serviceName, key, err.Description()))
}
}
}
return fmt.Errorf(strings.Join(validationErrors, "\n"))
}
return nil
}
func validateServiceConstraints(service RawService, serviceName string) error {
service = convertServiceKeysToStrings(service)
var validationErrors []string
dataLoader := gojsonschema.NewGoLoader(service)
result, err := gojsonschema.Validate(constraintSchemaLoaderV1, dataLoader)
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if err != nil {
return err
}
if !result.Valid() {
for _, err := range result.Errors() {
if err.Type() == "number_any_of" {
_, containsImage := service["image"]
_, containsBuild := service["build"]
_, containsDockerfile := service["dockerfile"]
if containsImage && containsBuild {
validationErrors = append(validationErrors, fmt.Sprintf("Service '%s' has both an image and build path specified. A service can either be built to image or use an existing image, not both.", serviceName))
} else if !containsImage && !containsBuild {
validationErrors = append(validationErrors, fmt.Sprintf("Service '%s' has neither an image nor a build path specified. Exactly one must be provided.", serviceName))
} else if containsImage && containsDockerfile {
validationErrors = append(validationErrors, fmt.Sprintf("Service '%s' has both an image and alternate Dockerfile. A service can either be built to image or use an existing image, not both.", serviceName))
}
}
}
return fmt.Errorf(strings.Join(validationErrors, "\n"))
}
return nil
}
func validateServiceConstraintsv2(service RawService, serviceName string) error {
service = convertServiceKeysToStrings(service)
var validationErrors []string
dataLoader := gojsonschema.NewGoLoader(service)
result, err := gojsonschema.Validate(constraintSchemaLoaderV2, dataLoader)
if err != nil {
return err
}
if !result.Valid() {
for _, err := range result.Errors() {
if err.Type() == "required" {
_, containsImage := service["image"]
_, containsBuild := service["build"]
if containsBuild || !containsImage && !containsBuild {
validationErrors = append(validationErrors, fmt.Sprintf("Service '%s' has neither an image nor a build context specified. At least one must be provided.", serviceName))
}
}
}
return fmt.Errorf(strings.Join(validationErrors, "\n"))
}
return nil
}