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gowsdl.go
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gowsdl.go
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package gowsdl
import (
"bytes"
"crypto/tls"
"encoding/xml"
"errors"
"fmt"
"io/ioutil"
"log"
"net"
"net/http"
"os"
"path/filepath"
"regexp"
"strings"
"sync"
"text/template"
"time"
"unicode"
)
const maxRecursion uint8 = 20
// GoWSDL defines the struct for WSDL generator.
type GoWSDL struct {
loc *Location
rawWSDL []byte
pkg string
ignoreTLS bool
makePublicFn func(string) string
wsdl *WSDL
resolvedXSDExternals map[string]bool
currentRecursionLevel uint8
currentNamespace string
}
// Method setNS sets (and returns) the currently active XML namespace.
func (g *GoWSDL) setNS(ns string) string {
g.currentNamespace = ns
return ns
}
// Method setNS returns the currently active XML namespace.
func (g *GoWSDL) getNS() string {
return g.currentNamespace
}
var cacheDir = filepath.Join(os.TempDir(), "gowsdl-cache")
func init() {
err := os.MkdirAll(cacheDir, 0700)
if err != nil {
log.Println("Create cache directory", "error", err)
os.Exit(1)
}
}
var timeout = time.Duration(30 * time.Second)
func dialTimeout(network, addr string) (net.Conn, error) {
return net.DialTimeout(network, addr, timeout)
}
func downloadFile(url string, ignoreTLS bool) ([]byte, error) {
tr := &http.Transport{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: ignoreTLS,
},
Dial: dialTimeout,
}
client := &http.Client{Transport: tr}
resp, err := client.Get(url)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, fmt.Errorf("Received response code %d", resp.StatusCode)
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
return data, nil
}
// NewGoWSDL initializes WSDL generator.
func NewGoWSDL(file, pkg string, ignoreTLS bool, exportAllTypes bool) (*GoWSDL, error) {
file = strings.TrimSpace(file)
if file == "" {
return nil, errors.New("WSDL file is required to generate Go proxy")
}
pkg = strings.TrimSpace(pkg)
if pkg == "" {
pkg = "myservice"
}
makePublicFn := func(id string) string { return id }
if exportAllTypes {
makePublicFn = makePublic
}
r, err := ParseLocation(file)
if err != nil {
return nil, err
}
return &GoWSDL{
loc: r,
pkg: pkg,
ignoreTLS: ignoreTLS,
makePublicFn: makePublicFn,
}, nil
}
// Start initiaties the code generation process by starting two goroutines: one
// to generate types and another one to generate operations.
func (g *GoWSDL) Start() (map[string][]byte, error) {
gocode := make(map[string][]byte)
err := g.unmarshal()
if err != nil {
return nil, err
}
// Process WSDL nodes
for _, schema := range g.wsdl.Types.Schemas {
newTraverser(schema, g.wsdl.Types.Schemas).traverse()
}
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
var err error
gocode["types"], err = g.genTypes()
if err != nil {
log.Println("genTypes", "error", err)
}
}()
wg.Add(1)
go func() {
defer wg.Done()
var err error
gocode["operations"], err = g.genOperations()
if err != nil {
log.Println(err)
}
}()
wg.Add(1)
go func() {
defer wg.Done()
var err error
gocode["server"], err = g.genServer()
if err != nil {
log.Println(err)
}
}()
wg.Wait()
gocode["header"], err = g.genHeader()
if err != nil {
log.Println(err)
}
gocode["server_header"], err = g.genServerHeader()
if err != nil {
log.Println(err)
}
gocode["server_wsdl"] = []byte("var wsdl = `" + string(g.rawWSDL) + "`")
return gocode, nil
}
func (g *GoWSDL) fetchFile(loc *Location) (data []byte, err error) {
if loc.f != "" {
log.Println("Reading", "file", loc.f)
data, err = ioutil.ReadFile(loc.f)
} else {
log.Println("Downloading", "file", loc.u.String())
data, err = downloadFile(loc.u.String(), g.ignoreTLS)
}
return
}
func (g *GoWSDL) unmarshal() error {
data, err := g.fetchFile(g.loc)
if err != nil {
return err
}
g.wsdl = new(WSDL)
err = xml.Unmarshal(data, g.wsdl)
if err != nil {
return err
}
g.rawWSDL = data
for _, schema := range g.wsdl.Types.Schemas {
err = g.resolveXSDExternals(schema, g.loc)
if err != nil {
return err
}
}
return nil
}
func (g *GoWSDL) resolveXSDExternals(schema *XSDSchema, loc *Location) error {
download := func(base *Location, ref string) error {
location, err := base.Parse(ref)
if err != nil {
return err
}
schemaKey := location.String()
if g.resolvedXSDExternals[location.String()] {
return nil
}
if g.resolvedXSDExternals == nil {
g.resolvedXSDExternals = make(map[string]bool, maxRecursion)
}
g.resolvedXSDExternals[schemaKey] = true
var data []byte
if data, err = g.fetchFile(location); err != nil {
return err
}
newschema := new(XSDSchema)
err = xml.Unmarshal(data, newschema)
if err != nil {
return err
}
if (len(newschema.Includes) > 0 || len(newschema.Imports) > 0) &&
maxRecursion > g.currentRecursionLevel {
g.currentRecursionLevel++
err = g.resolveXSDExternals(newschema, location)
if err != nil {
return err
}
}
g.wsdl.Types.Schemas = append(g.wsdl.Types.Schemas, newschema)
return nil
}
for _, impts := range schema.Imports {
// Download the file only if we have a hint in the form of schemaLocation.
if impts.SchemaLocation == "" {
log.Printf("[WARN] Don't know where to find XSD for %s", impts.Namespace)
continue
}
if e := download(loc, impts.SchemaLocation); e != nil {
return e
}
}
for _, incl := range schema.Includes {
if e := download(loc, incl.SchemaLocation); e != nil {
return e
}
}
return nil
}
func (g *GoWSDL) genTypes() ([]byte, error) {
funcMap := template.FuncMap{
"toGoType": toGoType,
"stripns": stripns,
"replaceReservedWords": replaceReservedWords,
"replaceAttrReservedWords": replaceAttrReservedWords,
"normalize": normalize,
"makePublic": g.makePublicFn,
"makeFieldPublic": makePublic,
"comment": comment,
"removeNS": removeNS,
"goString": goString,
"findNameByType": g.findNameByType,
"removePointerFromType": removePointerFromType,
"setNS": g.setNS,
"getNS": g.getNS,
}
data := new(bytes.Buffer)
tmpl := template.Must(template.New("types").Funcs(funcMap).Parse(typesTmpl))
err := tmpl.Execute(data, g.wsdl.Types)
if err != nil {
return nil, err
}
return data.Bytes(), nil
}
func (g *GoWSDL) genOperations() ([]byte, error) {
funcMap := template.FuncMap{
"toGoType": toGoType,
"stripns": stripns,
"replaceReservedWords": replaceReservedWords,
"normalize": normalize,
"makePublic": g.makePublicFn,
"makePrivate": makePrivate,
"findType": g.findType,
"findSOAPAction": g.findSOAPAction,
"findServiceAddress": g.findServiceAddress,
}
data := new(bytes.Buffer)
tmpl := template.Must(template.New("operations").Funcs(funcMap).Parse(opsTmpl))
err := tmpl.Execute(data, g.wsdl.PortTypes)
if err != nil {
return nil, err
}
return data.Bytes(), nil
}
func (g *GoWSDL) genServer() ([]byte, error) {
funcMap := template.FuncMap{
"toGoType": toGoType,
"stripns": stripns,
"replaceReservedWords": replaceReservedWords,
"makePublic": g.makePublicFn,
"findType": g.findType,
"findSOAPAction": g.findSOAPAction,
"findServiceAddress": g.findServiceAddress,
}
data := new(bytes.Buffer)
tmpl := template.Must(template.New("server").Funcs(funcMap).Parse(serverTmpl))
err := tmpl.Execute(data, g.wsdl.PortTypes)
if err != nil {
return nil, err
}
return data.Bytes(), nil
}
func (g *GoWSDL) genHeader() ([]byte, error) {
funcMap := template.FuncMap{
"toGoType": toGoType,
"stripns": stripns,
"replaceReservedWords": replaceReservedWords,
"normalize": normalize,
"makePublic": g.makePublicFn,
"findType": g.findType,
"comment": comment,
}
data := new(bytes.Buffer)
tmpl := template.Must(template.New("header").Funcs(funcMap).Parse(headerTmpl))
err := tmpl.Execute(data, g.pkg)
if err != nil {
return nil, err
}
return data.Bytes(), nil
}
func (g *GoWSDL) genServerHeader() ([]byte, error) {
funcMap := template.FuncMap{
"toGoType": toGoType,
"stripns": stripns,
"replaceReservedWords": replaceReservedWords,
"makePublic": g.makePublicFn,
"findType": g.findType,
"comment": comment,
}
data := new(bytes.Buffer)
tmpl := template.Must(template.New("server_header").Funcs(funcMap).Parse(serverHeaderTmpl))
err := tmpl.Execute(data, g.pkg)
if err != nil {
return nil, err
}
return data.Bytes(), nil
}
var reservedWords = map[string]string{
"break": "break_",
"default": "default_",
"func": "func_",
"interface": "interface_",
"select": "select_",
"case": "case_",
"defer": "defer_",
"go": "go_",
"map": "map_",
"struct": "struct_",
"chan": "chan_",
"else": "else_",
"goto": "goto_",
"package": "package_",
"switch": "switch_",
"const": "const_",
"fallthrough": "fallthrough_",
"if": "if_",
"range": "range_",
"type": "type_",
"continue": "continue_",
"for": "for_",
"import": "import_",
"return": "return_",
"var": "var_",
}
var reservedWordsInAttr = map[string]string{
"break": "break_",
"default": "default_",
"func": "func_",
"interface": "interface_",
"select": "select_",
"case": "case_",
"defer": "defer_",
"go": "go_",
"map": "map_",
"struct": "struct_",
"chan": "chan_",
"else": "else_",
"goto": "goto_",
"package": "package_",
"switch": "switch_",
"const": "const_",
"fallthrough": "fallthrough_",
"if": "if_",
"range": "range_",
"type": "type_",
"continue": "continue_",
"for": "for_",
"import": "import_",
"return": "return_",
"var": "var_",
"string": "astring",
}
var specialCharacterMapping = map[string]string{
"+": "Plus",
"@": "At",
}
// Replaces Go reserved keywords to avoid compilation issues
func replaceReservedWords(identifier string) string {
value := reservedWords[identifier]
if value != "" {
return value
}
return normalize(identifier)
}
// Replaces Go reserved keywords to avoid compilation issues
func replaceAttrReservedWords(identifier string) string {
value := reservedWordsInAttr[identifier]
if value != "" {
return value
}
return normalize(identifier)
}
// Normalizes value to be used as a valid Go identifier, avoiding compilation issues
func normalize(value string) string {
for k, v := range specialCharacterMapping {
value = strings.ReplaceAll(value, k, v)
}
mapping := func(r rune) rune {
if r == '.' || r == '-' {
return '_'
}
if unicode.IsLetter(r) || unicode.IsDigit(r) || r == '_' {
return r
}
return -1
}
return strings.Map(mapping, value)
}
func goString(s string) string {
return strings.ReplaceAll(s, "\"", "\\\"")
}
var xsd2GoTypes = map[string]string{
"string": "string",
"token": "string",
"float": "float32",
"double": "float64",
"decimal": "float64",
"integer": "int32",
"int": "int32",
"short": "int16",
"byte": "int8",
"long": "int64",
"boolean": "bool",
"datetime": "soap.XSDDateTime",
"date": "soap.XSDDate",
"time": "soap.XSDTime",
"base64binary": "[]byte",
"hexbinary": "[]byte",
"unsignedint": "uint32",
"nonnegativeinteger": "uint32",
"unsignedshort": "uint16",
"unsignedbyte": "byte",
"unsignedlong": "uint64",
"anytype": "AnyType",
"ncname": "NCName",
"anyuri": "AnyURI",
}
func removeNS(xsdType string) string {
// Handles name space, ie. xsd:string, xs:string
r := strings.Split(xsdType, ":")
if len(r) == 2 {
return r[1]
}
return r[0]
}
func toGoType(xsdType string, nillable bool) string {
// Handles name space, ie. xsd:string, xs:string
r := strings.Split(xsdType, ":")
t := r[0]
if len(r) == 2 {
t = r[1]
}
value := xsd2GoTypes[strings.ToLower(t)]
if value != "" {
if nillable {
value = "*" + value
}
return value
}
return "*" + replaceReservedWords(makePublic(t))
}
func removePointerFromType(goType string) string {
return regexp.MustCompile("^\\s*\\*").ReplaceAllLiteralString(goType, "")
}
// Given a message, finds its type.
//
// I'm not very proud of this function but
// it works for now and performance doesn't
// seem critical at this point
func (g *GoWSDL) findType(message string) string {
message = stripns(message)
for _, msg := range g.wsdl.Messages {
if msg.Name != message {
continue
}
// Assumes document/literal wrapped WS-I
if len(msg.Parts) == 0 {
// Message does not have parts. This could be a Port
// with HTTP binding or SOAP 1.2 binding, which are not currently
// supported.
log.Printf("[WARN] %s message doesn't have any parts, ignoring message...", msg.Name)
continue
}
part := msg.Parts[0]
if part.Type != "" {
return stripns(part.Type)
}
elRef := stripns(part.Element)
for _, schema := range g.wsdl.Types.Schemas {
for _, el := range schema.Elements {
if strings.EqualFold(elRef, el.Name) {
if el.Type != "" {
return stripns(el.Type)
}
return el.Name
}
}
}
}
return ""
}
// Given a type, check if there's an Element with that type, and return its name.
func (g *GoWSDL) findNameByType(name string) string {
return newTraverser(nil, g.wsdl.Types.Schemas).findNameByType(name)
}
// TODO(c4milo): Add support for namespaces instead of striping them out
// TODO(c4milo): improve runtime complexity if performance turns out to be an issue.
func (g *GoWSDL) findSOAPAction(operation, portType string) string {
for _, binding := range g.wsdl.Binding {
if strings.ToUpper(stripns(binding.Type)) != strings.ToUpper(portType) {
continue
}
for _, soapOp := range binding.Operations {
if soapOp.Name == operation {
return soapOp.SOAPOperation.SOAPAction
}
}
}
return ""
}
func (g *GoWSDL) findServiceAddress(name string) string {
for _, service := range g.wsdl.Service {
for _, port := range service.Ports {
if port.Name == name {
return port.SOAPAddress.Location
}
}
}
return ""
}
// TODO(c4milo): Add namespace support instead of stripping it
func stripns(xsdType string) string {
r := strings.Split(xsdType, ":")
t := r[0]
if len(r) == 2 {
t = r[1]
}
return t
}
func makePublic(identifier string) string {
if isBasicType(identifier) {
return identifier
}
if identifier == "" {
return "EmptyString"
}
field := []rune(identifier)
if len(field) == 0 {
return identifier
}
field[0] = unicode.ToUpper(field[0])
return string(field)
}
var basicTypes = map[string]string{
"string": "string",
"float32": "float32",
"float64": "float64",
"int": "int",
"int8": "int8",
"int16": "int16",
"int32": "int32",
"int64": "int64",
"bool": "bool",
"time.Time": "time.Time",
"[]byte": "[]byte",
"byte": "byte",
"uint16": "uint16",
"uint32": "uint32",
"uinit64": "uint64",
"interface{}": "interface{}",
}
func isBasicType(identifier string) bool {
if _, exists := basicTypes[identifier]; exists {
return true
}
return false
}
func makePrivate(identifier string) string {
field := []rune(identifier)
if len(field) == 0 {
return identifier
}
field[0] = unicode.ToLower(field[0])
return string(field)
}
func comment(text string) string {
lines := strings.Split(text, "\n")
var output string
if len(lines) == 1 && lines[0] == "" {
return ""
}
// Helps to determine if there is an actual comment without screwing newlines
// in real comments.
hasComment := false
for _, line := range lines {
line = strings.TrimLeftFunc(line, unicode.IsSpace)
if line != "" {
hasComment = true
}
output += "\n// " + line
}
if hasComment {
return output
}
return ""
}