Swagger Generator (swgen)

Swagger Generator is a library which helps to generate Swagger Specification in JSON format on-the-fly.

Installation

You can use go get to install the swgen package

go get github.com/lazada/swgen

Then import it into your own code

import "github.com/lazada/swgen"

Example

package main

import (
    "fmt"

    "github.com/lazada/swgen"
)

// PetsRequest defines all params for /pets request
type PetsRequest struct {
    Tags  []string `schema:"tags" in:"query" required:"-" description:"tags to filter by"`
    Limit int32    `schema:"limit" in:"query" required:"-" description:"maximum number of results to return"`
}

// Pet contains information of a pet
type Pet struct {
    ID   int64  `json:"id"`
    Name string `json:"name"`
    Tag  string `json:"tag"`
}

func main() {
	gen := swgen.NewGenerator()
	gen.SetHost("petstore.swagger.io").SetBasePath("/api")
	gen.SetInfo("Swagger Petstore (Simple)", "A sample API that uses a petstore as an example to demonstrate features in the swagger-2.0 specification", "http://helloreverb.com/terms/", "2.0")
	gen.SetLicense("MIT", "http://opensource.org/licenses/MIT")
	gen.SetContact("Swagger API team", "http://swagger.io", "foo@example.com")
	gen.AddSecurityDefinition("BasicAuth", swgen.SecurityDef{Type: swgen.SecurityBasicAuth})

	pathInf := swgen.PathItemInfo{
		Path:        "/pets",
		Method:      "GET",
		Title:       "findPets",
		Description: "Returns all pets from the system that the user has access to",
		Tag:         "v1",
		Deprecated:  false,
		Security:    []string{"BasicAuth"},
	}
	pathInf.AddExtendedField("x-example", "example")

	gen.SetPathItem(
		pathInf,
		PetsRequest{}, // request object
		nil,           // body data if any
		[]Pet{},       // response object
	)

	// extended field
	gen.AddExtendedField("x-uppercase-version", true)

	docData, _ := gen.GenDocument()
	fmt.Println(string(docData))

	// output:
	// {"swagger":"2.0","info":{"title":"Swagger Petstore (Simple)","description":"A sample API that uses a petstore as an example to demonstrate features in the swagger-2.0 specification","termsOfService":"http://helloreverb.com/terms/","contact":{"name":"Swagger API team","url":"http://swagger.io","email":"foo@example.com"},"license":{"name":"MIT","url":"http://opensource.org/licenses/MIT"},"version":"2.0"},"host":"petstore.swagger.io","basePath":"/api","schemes":["http","https"],"paths":{"/pets":{"get":{"tags":["v1"],"summary":"findPets","description":"Returns all pets from the system that the user has access to","parameters":[{"name":"tags","in":"query","type":"array","items":{"type":"string"},"collectionFormat":"multi","description":"tags to filter by"},{"name":"limit","in":"query","type":"integer","format":"int32","description":"maximum number of results to return"}],"responses":{"200":{"description":"request success","schema":{"type":"array","items":{"$ref":"#/definitions/Pet"}}}},"security":{"BasicAuth":[]},"x-example":"example"}}},"definitions":{"Pet":{"type":"object","properties":{"id":{"type":"integer","format":"int64"},"name":{"type":"string"},"tag":{"type":"string"}}}},"securityDefinitions":{"BasicAuth":{"type":"basic"}},"x-uppercase-version":true}
}

Generate swagger docs for RPC service

You even can use swgen to generate swagger document for a JSON-RPC service as below example

package main

import (
	"fmt"

	"github.com/lazada/swgen"
)

const (
	// XServiceType is a swagger vendor extension
	XServiceType = `x-service-type`
	// XAttachVersionToHead is a swagger vendor extension
	XAttachVersionToHead = `x-attach-version-to-head`
)

// Pet contains information of a pet
type Pet struct {
	ID   int64  `json:"id"`
	Name string `json:"name"`
	Tag  string `json:"tag"`
}

func main()  {
	gen := swgen.NewGenerator()
	gen.SetHost("petstore.swagger.io")
	gen.SetBasePath("/rpc") // set JSON-RPC path
	gen.SetInfo("Swagger Petstore (Simple)", "A sample API that uses a petstore as an example to demonstrate features in the swagger-2.0 specification", "http://helloreverb.com/terms/", "2.0")
	gen.SetLicense("MIT", "http://opensource.org/licenses/MIT")
	gen.SetContact("Swagger API team", "http://swagger.io", "foo@example.com")

	// set service type is JSON-RPC
	gen.AddExtendedField(XServiceType, swgen.ServiceTypeJSONRPC)
	gen.AddExtendedField(XAttachVersionToHead, false)

	pathInf := swgen.PathItemInfo{
		Path:        "addPet", // in JSON-RPC, use name of method for Path
		Method:      "POST",   // JSON-RPC always use POST method
		Title:       "Add new Pet",
		Description: "Add a new pet to the store",
		Tag:         "v1",
		Deprecated:  false,
	}

	gen.SetPathItem(
		pathInf,
		nil,   // no param, all in body
		Pet{}, // body data if any
		Pet{}, // response object
	)

	docData, _ := gen.GenDocument()
	fmt.Println(string(docData))

	// output:
	// {"swagger":"2.0","info":{"title":"Swagger Petstore (Simple)","description":"A sample API that uses a petstore as an example to demonstrate features in the swagger-2.0 specification","termsOfService":"http://helloreverb.com/terms/","contact":{"name":"Swagger API team","url":"http://swagger.io","email":"foo@example.com"},"license":{"name":"MIT","url":"http://opensource.org/licenses/MIT"},"version":"2.0"},"host":"petstore.swagger.io","basePath":"/rpc","schemes":["http","https"],"paths":{"addPet":{"post":{"tags":["v1"],"summary":"Add new Pet","description":"Add a new pet to the store","parameters":[{"name":"body","in":"body","schema":{"$ref":"#/definitions/Pet"},"required":true}],"responses":{"200":{"description":"request success","schema":{"$ref":"#/definitions/Pet"}}}}}},"definitions":{"Pet":{"type":"object","properties":{"id":{"type":"integer","format":"int64"},"name":{"type":"string"},"tag":{"type":"string"}}}},"x-attach-version-to-head":false,"x-service-type":"json-rpc"}
}

License

Distributed under the Apache License, version 2.0. Please see license file in code for more details.