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formats.go
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formats.go
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package importer
import (
"fmt"
"io/ioutil"
"path/filepath"
"strings"
"github.com/ghodss/yaml"
)
// Format represents a format that can be imported into Sysl
type Format struct {
Name string // Name of the format
Signature string // This is a string which can be used to uniquely identify the format
FileExt []string // The file extension of the format
}
var SYSL = Format{
Name: "sysl",
Signature: "",
FileExt: []string{".sysl"},
}
var XSD = Format{
Name: "xsd",
Signature: ``,
FileExt: []string{".xsd", ".xml"},
}
var Grammar = Format{
Name: "grammar",
Signature: "",
FileExt: []string{".g"},
}
var Avro = Format{
Name: "avro",
Signature: "",
FileExt: []string{".avsc"},
}
var SpannerSQL = Format{
Name: "spannerSQL",
Signature: "",
FileExt: []string{".sql"},
}
var SpannerSQLDir = Format{
Name: "spannerSQLdir",
Signature: "",
FileExt: []string{".up.sql"},
}
var Postgres = Format{
Name: "postgres",
Signature: "",
FileExt: []string{".sql"},
}
var PostgresDir = Format{
Name: "postgresDir",
Signature: "",
FileExt: []string{".up.sql"},
}
var Protobuf = Format{
Name: "protobuf",
Signature: "",
FileExt: []string{".proto"},
}
var ProtobufDir = Format{
Name: "protobufDir",
Signature: "",
FileExt: []string{".up.proto"},
}
var MySQL = Format{
Name: "mysql",
Signature: "",
FileExt: []string{".sql"},
}
var MySQLDir = Format{
Name: "mysqlDir",
Signature: "",
FileExt: []string{".up.sql"},
}
var BigQuery = Format{
Name: "bigquery",
Signature: "",
FileExt: []string{".sql"},
}
// OpenAPI3 is identified by the openapi header. - The value MUST be "3.x.x".
// For more details refer to https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.0.md#oasDocument
var OpenAPI3 = Format{
Name: "openapi3",
Signature: `openapi:`,
FileExt: []string{".yaml", ".json", ".yml"},
}
// OpenAPI2 only has swagger 2.0.0 as the single valid format - The value MUST be "2.0".
// For more details refer to https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md#swaggerObject
var OpenAPI2 = Format{
Name: "swagger",
Signature: `swagger:`,
FileExt: []string{".yaml", ".json", ".yml"},
}
var JSONSchema = Format{
Name: "jsonschema",
Signature: "$schema",
FileExt: []string{".json"},
}
// GuessFileType detects the file based on the filename extension and the file itself.
// It returns the detected format if successful, or an error if not.
// It first tries to match the file extensions before checking the files for signatures such as
// `swagger: "2.0"`.
func GuessFileType(path string, isDir bool, content []byte, validFormats []Format) (Format, error) {
if isDir {
if files, err := ioutil.ReadDir(path); err == nil {
for _, info := range files {
if strings.HasSuffix(info.Name(), ".up.sql") || strings.HasSuffix(info.Name(), ".up.ddl") {
return Format{}, fmt.Errorf(
"input file format for %s could be one of {%v, %v, %v, %v}; pass --format to specify",
path, SpannerSQLDir.Name, PostgresDir.Name, MySQLDir.Name, ProtobufDir.Name)
}
}
}
}
var matchesExt []Format
ext := filepath.Ext(path)
for _, format := range validFormats {
for _, formatExt := range format.FileExt {
if formatExt == ext {
matchesExt = append(matchesExt, format)
break
}
}
}
if len(matchesExt) == 1 {
return matchesExt[0], nil
}
var matchesSignature []Format
// Convert to yaml so we only need to compare a single format
if ext == ".json" {
var err error
content, err = yaml.JSONToYAML(content)
if err != nil {
return Format{}, fmt.Errorf("error converting spec to yaml for: %s", path)
}
}
for _, format := range matchesExt {
if strings.Contains(string(content), format.Signature) {
matchesSignature = append(matchesSignature, format)
}
}
switch len(matchesSignature) {
case 1:
return matchesSignature[0], nil
case 0:
return Format{}, fmt.Errorf("error detecting input file format for %s", path)
default:
names := make([]string, len(matchesSignature))
for i, f := range matchesSignature {
names[i] = f.Name
}
return Format{}, fmt.Errorf(
"input file format for %s could be one of {%v}; pass --format to specify",
path,
strings.Join(names, ", "))
}
}