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jv.go
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jv.go
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package main
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/unix-world/smartgo/web/jsonschema"
_ "github.com/unix-world/smartgo/web/jsonschema/httploader"
"github.com/unix-world/smartgo/data-structs/yaml"
)
func usage() {
fmt.Fprintln(os.Stderr, "jv [-draft INT] [-output FORMAT] [-assertformat] [-assertcontent] <json-schema> [<json-or-yaml-doc>]...")
flag.PrintDefaults()
}
func main() {
draft := flag.Int("draft", 2020, "draft used when '$schema' attribute is missing. valid values 4, 5, 7, 2019, 2020")
output := flag.String("output", "", "output format. valid values flag, basic, detailed")
assertFormat := flag.Bool("assertformat", false, "enable format assertions with draft >= 2019")
assertContent := flag.Bool("assertcontent", false, "enable content assertions with draft >= 2019")
flag.Usage = usage
flag.Parse()
if len(flag.Args()) == 0 {
usage()
os.Exit(1)
}
compiler := jsonschema.NewCompiler()
switch *draft {
case 4:
compiler.Draft = jsonschema.Draft4
case 6:
compiler.Draft = jsonschema.Draft6
case 7:
compiler.Draft = jsonschema.Draft7
case 2019:
compiler.Draft = jsonschema.Draft2019
case 2020:
compiler.Draft = jsonschema.Draft2020
default:
fmt.Fprintln(os.Stderr, "draft must be 4, 5, 7, 2019 or 2020")
os.Exit(1)
}
compiler.LoadURL = loadURL
compiler.AssertFormat = *assertFormat
compiler.AssertContent = *assertContent
var validOutput bool
for _, out := range []string{"", "flag", "basic", "detailed"} {
if *output == out {
validOutput = true
break
}
}
if !validOutput {
fmt.Fprintln(os.Stderr, "output must be flag, basic or detailed")
os.Exit(1)
}
schema, err := compiler.Compile(flag.Arg(0))
if err != nil {
fmt.Fprintf(os.Stderr, "%#v\n", err)
os.Exit(1)
}
exitCode := 0
for _, f := range flag.Args()[1:] {
file, err := os.Open(f)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
exitCode = 1
continue
}
v, err := decodeFile(file)
_ = file.Close()
if err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err)
exitCode = 1
continue
}
err = schema.Validate(v)
if err != nil {
exitCode = 1
if ve, ok := err.(*jsonschema.ValidationError); ok {
var out interface{}
switch *output {
case "flag":
out = ve.FlagOutput()
case "basic":
out = ve.BasicOutput()
case "detailed":
out = ve.DetailedOutput()
}
if out == nil {
fmt.Fprintf(os.Stderr, "%#v\n", err)
} else {
b, _ := json.MarshalIndent(out, "", " ")
fmt.Fprintln(os.Stderr, string(b))
}
} else {
fmt.Fprintf(os.Stderr, "validation failed: %v\n", err)
}
} else {
if *output != "" {
fmt.Println("{\n \"valid\": true\n}")
}
}
}
os.Exit(exitCode)
}
func loadURL(s string) (io.ReadCloser, error) {
r, err := jsonschema.LoadURL(s)
if err != nil {
return nil, err
}
if strings.HasSuffix(s, ".yaml") || strings.HasSuffix(s, ".yml") {
defer r.Close()
v, err := decodeYAML(r, s)
if err != nil {
return nil, err
}
b, err := json.Marshal(v)
if err != nil {
return nil, err
}
return ioutil.NopCloser(bytes.NewReader(b)), nil
}
return r, err
}
func decodeFile(file *os.File) (interface{}, error) {
ext := filepath.Ext(file.Name())
if ext == ".yaml" || ext == ".yml" {
return decodeYAML(file, file.Name())
}
// json file
var v interface{}
dec := json.NewDecoder(file)
dec.UseNumber()
if err := dec.Decode(&v); err != nil {
return nil, fmt.Errorf("invalid json file %s: %v", file.Name(), err)
}
return v, nil
}
func decodeYAML(r io.Reader, name string) (interface{}, error) {
var v interface{}
dec := yaml.NewDecoder(r)
if err := dec.Decode(&v); err != nil {
return nil, fmt.Errorf("invalid yaml file %s: %v", name, err)
}
return v, nil
}