vikunja-api/vendor/github.com/swaggo/swag/operation.go
2019-01-03 22:22:06 +00:00

674 lines
21 KiB
Go

package swag
import (
"fmt"
"go/ast"
goparser "go/parser"
"go/token"
"log"
"net/http"
"os"
"regexp"
"strconv"
"strings"
"github.com/go-openapi/jsonreference"
"github.com/go-openapi/spec"
"github.com/pkg/errors"
"golang.org/x/tools/go/loader"
)
// Operation describes a single API operation on a path.
// For more information: https://github.com/swaggo/swag#api-operation
type Operation struct {
HTTPMethod string
Path string
spec.Operation
parser *Parser
}
// NewOperation creates a new Operation with default properties.
// map[int]Response
func NewOperation() *Operation {
return &Operation{
HTTPMethod: "get",
Operation: spec.Operation{
OperationProps: spec.OperationProps{},
},
}
}
// ParseComment parses comment for given comment string and returns error if error occurs.
func (operation *Operation) ParseComment(comment string, astFile *ast.File) error {
commentLine := strings.TrimSpace(strings.TrimLeft(comment, "//"))
if len(commentLine) == 0 {
return nil
}
attribute := strings.Fields(commentLine)[0]
lineRemainder := strings.TrimSpace(commentLine[len(attribute):])
switch strings.ToLower(attribute) {
case "@description":
if operation.Description == "" {
operation.Description = lineRemainder
} else {
operation.Description += "\n" + lineRemainder
}
case "@summary":
operation.Summary = lineRemainder
case "@id":
operation.ID = lineRemainder
case "@tags":
operation.ParseTagsComment(lineRemainder)
case "@accept":
if err := operation.ParseAcceptComment(lineRemainder); err != nil {
return err
}
case "@produce":
if err := operation.ParseProduceComment(lineRemainder); err != nil {
return err
}
case "@param":
if err := operation.ParseParamComment(lineRemainder, astFile); err != nil {
return err
}
case "@success", "@failure":
if err := operation.ParseResponseComment(lineRemainder, astFile); err != nil {
if err := operation.ParseEmptyResponseComment(lineRemainder); err != nil {
if err := operation.ParseEmptyResponseOnly(lineRemainder); err != nil {
return err
}
}
}
case "@router":
if err := operation.ParseRouterComment(strings.TrimSpace(commentLine[len(attribute):])); err != nil {
return err
}
case "@security":
if err := operation.ParseSecurityComment(strings.TrimSpace(commentLine[len(attribute):])); err != nil {
return err
}
}
return nil
}
// ParseParamComment parses params return []string of param properties
// @Param queryText form string true "The email for login"
// [param name] [paramType] [data type] [is mandatory?] [Comment]
// @Param some_id path int true "Some ID"
func (operation *Operation) ParseParamComment(commentLine string, astFile *ast.File) error {
re := regexp.MustCompile(`([-\w]+)[\s]+([\w]+)[\s]+([\S.]+)[\s]+([\w]+)[\s]+"([^"]+)"`)
matches := re.FindStringSubmatch(commentLine)
if len(matches) != 6 {
return fmt.Errorf("can not parse param comment \"%s\"", commentLine)
}
name := matches[1]
paramType := matches[2]
schemaType := matches[3]
requiredText := strings.ToLower(matches[4])
required := requiredText == "true" || requiredText == "required"
description := matches[5]
var param spec.Parameter
//five possible parameter types.
switch paramType {
case "query", "path", "header":
param = createParameter(paramType, description, name, TransToValidSchemeType(schemaType), required)
case "body":
param = createParameter(paramType, description, name, "object", required) // TODO: if Parameter types can be objects, but also primitives and arrays
// TODO: this snippets have to extract out
refSplit := strings.Split(schemaType, ".")
if len(refSplit) == 2 {
pkgName := refSplit[0]
typeName := refSplit[1]
if typeSpec, ok := operation.parser.TypeDefinitions[pkgName][typeName]; ok {
operation.parser.registerTypes[schemaType] = typeSpec
} else {
var typeSpec *ast.TypeSpec
if astFile != nil {
for _, imp := range astFile.Imports {
if imp.Name != nil && imp.Name.Name == pkgName { // the import had an alias that matched
break
}
impPath := strings.Replace(imp.Path.Value, `"`, ``, -1)
if strings.HasSuffix(impPath, "/"+pkgName) {
var err error
typeSpec, err = findTypeDef(impPath, typeName)
if err != nil {
return errors.Wrapf(err, "can not find ref type: %q", schemaType)
}
break
}
}
}
if typeSpec == nil {
return fmt.Errorf("can not find ref type:\"%s\"", schemaType)
}
operation.parser.TypeDefinitions[pkgName][typeName] = typeSpec
operation.parser.registerTypes[schemaType] = typeSpec
}
param.Schema.Ref = spec.Ref{
Ref: jsonreference.MustCreateRef("#/definitions/" + schemaType),
}
}
case "formData":
param = createParameter(paramType, description, name, TransToValidSchemeType(schemaType), required)
}
param = operation.parseAndExtractionParamAttribute(commentLine, schemaType, param)
operation.Operation.Parameters = append(operation.Operation.Parameters, param)
return nil
}
var regexAttributes = map[string]*regexp.Regexp{
// for Enums(A, B)
"enums": regexp.MustCompile(`(?i)enums\(.*\)`),
// for Minimum(0)
"maxinum": regexp.MustCompile(`(?i)maxinum\(.*\)`),
// for Maximum(0)
"mininum": regexp.MustCompile(`(?i)mininum\(.*\)`),
// for Maximum(0)
"default": regexp.MustCompile(`(?i)default\(.*\)`),
// for minlength(0)
"minlength": regexp.MustCompile(`(?i)minlength\(.*\)`),
// for maxlength(0)
"maxlength": regexp.MustCompile(`(?i)maxlength\(.*\)`),
// for format(email)
"format": regexp.MustCompile(`(?i)format\(.*\)`),
}
func (operation *Operation) parseAndExtractionParamAttribute(commentLine, schemaType string, param spec.Parameter) spec.Parameter {
schemaType = TransToValidSchemeType(schemaType)
for attrKey, re := range regexAttributes {
switch attrKey {
case "enums":
attr := re.FindString(commentLine)
l := strings.Index(attr, "(")
r := strings.Index(attr, ")")
if !(l == -1 && r == -1) {
enums := strings.Split(attr[l+1:r], ",")
for _, e := range enums {
e = strings.TrimSpace(e)
param.Enum = append(param.Enum, defineType(schemaType, e))
}
}
case "maxinum":
attr := re.FindString(commentLine)
l := strings.Index(attr, "(")
r := strings.Index(attr, ")")
if !(l == -1 && r == -1) {
if schemaType != "integer" && schemaType != "number" {
log.Panicf("maxinum is attribute to set to a number. comment=%s got=%s", commentLine, schemaType)
}
attr = strings.TrimSpace(attr[l+1 : r])
n, err := strconv.ParseFloat(attr, 64)
if err != nil {
log.Panicf("maximum is allow only a number. comment=%s got=%s", commentLine, attr)
}
param.Maximum = &n
}
case "mininum":
attr := re.FindString(commentLine)
l := strings.Index(attr, "(")
r := strings.Index(attr, ")")
if !(l == -1 && r == -1) {
if schemaType != "integer" && schemaType != "number" {
log.Panicf("mininum is attribute to set to a number. comment=%s got=%s", commentLine, schemaType)
}
attr = strings.TrimSpace(attr[l+1 : r])
n, err := strconv.ParseFloat(attr, 64)
if err != nil {
log.Panicf("mininum is allow only a number got=%s", attr)
}
param.Minimum = &n
}
case "default":
attr := re.FindString(commentLine)
l := strings.Index(attr, "(")
r := strings.Index(attr, ")")
if !(l == -1 && r == -1) {
attr = strings.TrimSpace(attr[l+1 : r])
param.Default = defineType(schemaType, attr)
}
case "maxlength":
attr := re.FindString(commentLine)
l := strings.Index(attr, "(")
r := strings.Index(attr, ")")
if !(l == -1 && r == -1) {
if schemaType != "string" {
log.Panicf("maxlength is attribute to set to a number. comment=%s got=%s", commentLine, schemaType)
}
attr = strings.TrimSpace(attr[l+1 : r])
n, err := strconv.ParseInt(attr, 10, 64)
if err != nil {
log.Panicf("maxlength is allow only a number got=%s", attr)
}
param.MaxLength = &n
}
case "minlength":
attr := re.FindString(commentLine)
l := strings.Index(attr, "(")
r := strings.Index(attr, ")")
if !(l == -1 && r == -1) {
if schemaType != "string" {
log.Panicf("maxlength is attribute to set to a number. comment=%s got=%s", commentLine, schemaType)
}
attr = strings.TrimSpace(attr[l+1 : r])
n, err := strconv.ParseInt(attr, 10, 64)
if err != nil {
log.Panicf("minlength is allow only a number got=%s", attr)
}
param.MinLength = &n
}
case "format":
attr := re.FindString(commentLine)
l := strings.Index(attr, "(")
r := strings.Index(attr, ")")
if !(l == -1 && r == -1) {
param.Format = strings.TrimSpace(attr[l+1 : r])
}
}
}
return param
}
// defineType enum value define the type (object and array unsupported)
func defineType(schemaType string, value string) interface{} {
schemaType = TransToValidSchemeType(schemaType)
switch schemaType {
case "string":
return value
case "number":
v, err := strconv.ParseFloat(value, 64)
if err != nil {
panic(fmt.Errorf("enum value %s can't convert to %s err: %s", value, schemaType, err))
}
return v
case "integer":
v, err := strconv.Atoi(value)
if err != nil {
panic(fmt.Errorf("enum value %s can't convert to %s err: %s", value, schemaType, err))
}
return v
case "boolean":
v, err := strconv.ParseBool(value)
if err != nil {
panic(fmt.Errorf("enum value %s can't convert to %s err: %s", value, schemaType, err))
}
return v
default:
panic(fmt.Errorf("%s is unsupported type in enum value", schemaType))
}
}
// ParseTagsComment parses comment for given `tag` comment string.
func (operation *Operation) ParseTagsComment(commentLine string) {
tags := strings.Split(commentLine, ",")
for _, tag := range tags {
operation.Tags = append(operation.Tags, strings.TrimSpace(tag))
}
}
// ParseAcceptComment parses comment for given `accept` comment string.
func (operation *Operation) ParseAcceptComment(commentLine string) error {
accepts := strings.Split(commentLine, ",")
for _, a := range accepts {
switch a {
case "json", "application/json":
operation.Consumes = append(operation.Consumes, "application/json")
case "xml", "text/xml":
operation.Consumes = append(operation.Consumes, "text/xml")
case "plain", "text/plain":
operation.Consumes = append(operation.Consumes, "text/plain")
case "html", "text/html":
operation.Consumes = append(operation.Consumes, "text/html")
case "mpfd", "multipart/form-data":
operation.Consumes = append(operation.Consumes, "multipart/form-data")
case "x-www-form-urlencoded", "application/x-www-form-urlencoded":
operation.Consumes = append(operation.Consumes, "application/x-www-form-urlencoded")
case "json-api", "application/vnd.api+json":
operation.Consumes = append(operation.Consumes, "application/vnd.api+json")
case "json-stream", "application/x-json-stream":
operation.Consumes = append(operation.Consumes, "application/x-json-stream")
case "octet-stream", "application/octet-stream":
operation.Consumes = append(operation.Consumes, "application/octet-stream")
case "png", "image/png":
operation.Consumes = append(operation.Consumes, "image/png")
case "jpeg", "image/jpeg":
operation.Consumes = append(operation.Consumes, "image/jpeg")
case "gif", "image/gif":
operation.Consumes = append(operation.Consumes, "image/gif")
default:
return fmt.Errorf("%v accept type can't accepted", a)
}
}
return nil
}
// ParseProduceComment parses comment for gived `produce` comment string.
func (operation *Operation) ParseProduceComment(commentLine string) error {
produces := strings.Split(commentLine, ",")
for _, a := range produces {
switch a {
case "json", "application/json":
operation.Produces = append(operation.Produces, "application/json")
case "xml", "text/xml":
operation.Produces = append(operation.Produces, "text/xml")
case "plain", "text/plain":
operation.Produces = append(operation.Produces, "text/plain")
case "html", "text/html":
operation.Produces = append(operation.Produces, "text/html")
case "mpfd", "multipart/form-data":
operation.Produces = append(operation.Produces, "multipart/form-data")
case "x-www-form-urlencoded", "application/x-www-form-urlencoded":
operation.Produces = append(operation.Produces, "application/x-www-form-urlencoded")
case "json-api", "application/vnd.api+json":
operation.Produces = append(operation.Produces, "application/vnd.api+json")
case "json-stream", "application/x-json-stream":
operation.Produces = append(operation.Produces, "application/x-json-stream")
case "octet-stream", "application/octet-stream":
operation.Produces = append(operation.Produces, "application/octet-stream")
case "png", "image/png":
operation.Produces = append(operation.Produces, "image/png")
case "jpeg", "image/jpeg":
operation.Produces = append(operation.Produces, "image/jpeg")
case "gif", "image/gif":
operation.Produces = append(operation.Produces, "image/gif")
default:
return fmt.Errorf("%v produce type can't accepted", a)
}
}
return nil
}
// ParseRouterComment parses comment for gived `router` comment string.
func (operation *Operation) ParseRouterComment(commentLine string) error {
re := regexp.MustCompile(`([\w\.\/\-{}\+]+)[^\[]+\[([^\]]+)`)
var matches []string
if matches = re.FindStringSubmatch(commentLine); len(matches) != 3 {
return fmt.Errorf("can not parse router comment \"%s\"", commentLine)
}
path := matches[1]
httpMethod := matches[2]
operation.Path = path
operation.HTTPMethod = strings.ToUpper(httpMethod)
return nil
}
// ParseSecurityComment parses comment for gived `security` comment string.
func (operation *Operation) ParseSecurityComment(commentLine string) error {
securitySource := commentLine[strings.Index(commentLine, "@Security")+1:]
l := strings.Index(securitySource, "[")
r := strings.Index(securitySource, "]")
// exists scope
if !(l == -1 && r == -1) {
scopes := securitySource[l+1 : r]
s := []string{}
for _, scope := range strings.Split(scopes, ",") {
scope = strings.TrimSpace(scope)
s = append(s, scope)
}
securityKey := securitySource[0:l]
securityMap := map[string][]string{}
securityMap[securityKey] = append(securityMap[securityKey], s...)
operation.Security = append(operation.Security, securityMap)
} else {
securityKey := strings.TrimSpace(securitySource)
securityMap := map[string][]string{}
securityMap[securityKey] = []string{}
operation.Security = append(operation.Security, securityMap)
}
return nil
}
// findTypeDef attempts to find the *ast.TypeSpec for a specific type given the
// type's name and the package's import path
func findTypeDef(importPath, typeName string) (*ast.TypeSpec, error) {
cwd, err := os.Getwd()
if err != nil {
return nil, err
}
conf := loader.Config{
ParserMode: goparser.SpuriousErrors,
Cwd: cwd,
}
conf.Import(importPath)
lprog, err := conf.Load()
if err != nil {
return nil, err
}
// If the pkg is vendored, the actual pkg path is going to resemble
// something like "{importPath}/vendor/{importPath}"
for k := range lprog.AllPackages {
realPkgPath := k.Path()
if strings.Contains(realPkgPath, "vendor/"+importPath) {
importPath = realPkgPath
}
}
pkgInfo := lprog.Package(importPath)
if pkgInfo == nil {
return nil, errors.New("package was nil")
}
// TODO: possibly cache pkgInfo since it's an expensive operation
for i := range pkgInfo.Files {
for _, astDeclaration := range pkgInfo.Files[i].Decls {
if generalDeclaration, ok := astDeclaration.(*ast.GenDecl); ok && generalDeclaration.Tok == token.TYPE {
for _, astSpec := range generalDeclaration.Specs {
if typeSpec, ok := astSpec.(*ast.TypeSpec); ok {
if typeSpec.Name.String() == typeName {
return typeSpec, nil
}
}
}
}
}
}
return nil, errors.New("type spec not found")
}
// ParseResponseComment parses comment for gived `response` comment string.
func (operation *Operation) ParseResponseComment(commentLine string, astFile *ast.File) error {
re := regexp.MustCompile(`([\d]+)[\s]+([\w\{\}]+)[\s]+([\w\-\.\/]+)[^"]*(.*)?`)
var matches []string
if matches = re.FindStringSubmatch(commentLine); len(matches) != 5 {
return fmt.Errorf("can not parse response comment \"%s\"", commentLine)
}
response := spec.Response{}
code, _ := strconv.Atoi(matches[1])
responseDescription := strings.Trim(matches[4], "\"")
if responseDescription == "" {
responseDescription = http.StatusText(code)
}
response.Description = responseDescription
schemaType := strings.Trim(matches[2], "{}")
refType := matches[3]
if operation.parser != nil { // checking refType has existing in 'TypeDefinitions'
refSplit := strings.Split(refType, ".")
if len(refSplit) == 2 {
pkgName := refSplit[0]
typeName := refSplit[1]
if typeSpec, ok := operation.parser.TypeDefinitions[pkgName][typeName]; ok {
operation.parser.registerTypes[refType] = typeSpec
} else {
var typeSpec *ast.TypeSpec
if astFile != nil {
for _, imp := range astFile.Imports {
if imp.Name != nil && imp.Name.Name == pkgName { // the import had an alias that matched
break
}
impPath := strings.Replace(imp.Path.Value, `"`, ``, -1)
if strings.HasSuffix(impPath, "/"+pkgName) {
var err error
typeSpec, err = findTypeDef(impPath, typeName)
if err != nil {
return errors.Wrapf(err, "can not find ref type: %q", refType)
}
break
}
}
}
if typeSpec == nil {
return fmt.Errorf("can not find ref type: %q", refType)
}
if _, ok := operation.parser.TypeDefinitions[pkgName]; !ok {
operation.parser.TypeDefinitions[pkgName] = make(map[string]*ast.TypeSpec)
}
operation.parser.TypeDefinitions[pkgName][typeName] = typeSpec
operation.parser.registerTypes[refType] = typeSpec
}
}
}
// so we have to know all type in app
//TODO: we might omitted schema.type if schemaType equals 'object'
response.Schema = &spec.Schema{SchemaProps: spec.SchemaProps{Type: []string{schemaType}}}
if schemaType == "object" {
response.Schema.Ref = spec.Ref{
Ref: jsonreference.MustCreateRef("#/definitions/" + refType),
}
}
if schemaType == "array" {
refType = TransToValidSchemeType(refType)
if IsPrimitiveType(refType) {
response.Schema.Items = &spec.SchemaOrArray{
Schema: &spec.Schema{
SchemaProps: spec.SchemaProps{
Type: spec.StringOrArray{refType},
},
},
}
} else {
response.Schema.Items = &spec.SchemaOrArray{
Schema: &spec.Schema{
SchemaProps: spec.SchemaProps{
Ref: spec.Ref{Ref: jsonreference.MustCreateRef("#/definitions/" + refType)},
},
},
}
}
}
if operation.Responses == nil {
operation.Responses = &spec.Responses{
ResponsesProps: spec.ResponsesProps{
StatusCodeResponses: make(map[int]spec.Response),
},
}
}
operation.Responses.StatusCodeResponses[code] = response
return nil
}
// ParseEmptyResponseComment parse only comment out status code and description,eg: @Success 200 "it's ok"
func (operation *Operation) ParseEmptyResponseComment(commentLine string) error {
re := regexp.MustCompile(`([\d]+)[\s]+"(.*)"`)
var matches []string
if matches = re.FindStringSubmatch(commentLine); len(matches) != 3 {
return fmt.Errorf("can not parse response comment \"%s\"", commentLine)
}
response := spec.Response{}
code, _ := strconv.Atoi(matches[1])
response.Description = strings.Trim(matches[2], "")
if operation.Responses == nil {
operation.Responses = &spec.Responses{
ResponsesProps: spec.ResponsesProps{
StatusCodeResponses: make(map[int]spec.Response),
},
}
}
operation.Responses.StatusCodeResponses[code] = response
return nil
}
//ParseEmptyResponseOnly parse only comment out status code ,eg: @Success 200
func (operation *Operation) ParseEmptyResponseOnly(commentLine string) error {
response := spec.Response{}
code, err := strconv.Atoi(commentLine)
if err != nil {
return fmt.Errorf("can not parse response comment \"%s\"", commentLine)
}
if operation.Responses == nil {
operation.Responses = &spec.Responses{
ResponsesProps: spec.ResponsesProps{
StatusCodeResponses: make(map[int]spec.Response),
},
}
}
operation.Responses.StatusCodeResponses[code] = response
return nil
}
// createParameter returns swagger spec.Parameter for gived paramType, description, paramName, schemaType, required
func createParameter(paramType, description, paramName, schemaType string, required bool) spec.Parameter {
// //five possible parameter types. query, path, body, header, form
paramProps := spec.ParamProps{
Name: paramName,
Description: description,
Required: required,
In: paramType,
}
if paramType == "body" {
paramProps.Schema = &spec.Schema{
SchemaProps: spec.SchemaProps{
Type: []string{schemaType},
},
}
parameter := spec.Parameter{
ParamProps: paramProps,
}
return parameter
}
parameter := spec.Parameter{
ParamProps: paramProps,
SimpleSchema: spec.SimpleSchema{
Type: schemaType,
},
}
return parameter
}