# swag

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Swag converts Go annotations to Swagger Documentation 2.0. We've created a variety of plugins for popular [Go web frameworks](#supported-web-frameworks). This allows you to quickly integrate with an existing Go project (using Swagger UI).

## Contents
 - [Getting started](#getting-started)
 - [Supported Web Frameworks](#supported-web-frameworks)
 - [How to use it with Gin](#how-to-use-it-with-gin)
 - [Implementation Status](#implementation-status)
 - [Declarative Comments Format](#declarative-comments-format)
	- [General API Info](#general-api-info)
	- [API Operation](#api-operation)
	- [Security](#security)
 - [Examples](#examples)
	- [Descriptions over multiple lines](#descriptions-over-multiple-lines)
	- [User defined structure with an array type](#user-defined-structure-with-an-array-type)
	- [Add a headers in response](#add-a-headers-in-response) 
	- [Use multiple path params](#use-multiple-path-params)
	- [Example value of struct](#example-value-of-struct)
	- [Description of struct](#description-of-struct)
	- [Use swaggertype tag to supported custom type](#use-swaggertype-tag-to-supported-custom-type)
	- [Add extension info to struct field](#add-extension-info-to-struct-field)
	- [How to using security annotations](#how-to-using-security-annotations)
- [About the Project](#about-the-project)

## Getting started

1. Add comments to your API source code, See [Declarative Comments Format](#declarative-comments-format).

2. Download swag by using:
```sh
$ go get -u github.com/swaggo/swag/cmd/swag
```
To build from source you need [Go](https://golang.org/dl/) (1.9 or newer).

Or download a pre-compiled binary from the [release page](https://github.com/swaggo/swag/releases).

3. Run `swag init` in the project's root folder which contains the `main.go` file. This will parse your comments and generate the required files (`docs` folder and `docs/docs.go`).
```sh
$ swag init
```

  Make sure to import the generated `docs/docs.go` so that your specific configuration gets `init`'ed. If your General API annotations do not live in `main.go`, you can let swag know with `-g` flag.
  ```sh
  swag init -g http/api.go
  ```

## swag cli

```sh
$ swag init -h
NAME:
   swag init - Create docs.go

USAGE:
   swag init [command options] [arguments...]

OPTIONS:
   --generalInfo value, -g value       Go file path in which 'swagger general API Info' is written (default: "main.go")
   --dir value, -d value               Directory you want to parse (default: "./")
   --propertyStrategy value, -p value  Property Naming Strategy like snakecase,camelcase,pascalcase (default: "camelcase")
   --output value, -o value            Output directory for all the generated files(swagger.json, swagger.yaml and doc.go) (default: "./docs")
   --parseVendor                       Parse go files in 'vendor' folder, disabled by default
   --parseDependency                   Parse go files in outside dependency folder, disabled by default
```

## Supported Web Frameworks

- [gin](http://github.com/swaggo/gin-swagger)
- [echo](http://github.com/swaggo/echo-swagger)
- [buffalo](https://github.com/swaggo/buffalo-swagger)
- [net/http](https://github.com/swaggo/http-swagger)

## How to use it with Gin

Find the example source code [here](https://github.com/swaggo/swag/tree/master/example/celler).

1. After using `swag init` to generate Swagger 2.0 docs, import the following packages:
```go
import "github.com/swaggo/gin-swagger" // gin-swagger middleware
import "github.com/swaggo/files" // swagger embed files
```

2. Add [General API](#general-api-info) annotations in `main.go` code:

```go
// @title Swagger Example API
// @version 1.0
// @description This is a sample server celler server.
// @termsOfService http://swagger.io/terms/

// @contact.name API Support
// @contact.url http://www.swagger.io/support
// @contact.email support@swagger.io

// @license.name Apache 2.0
// @license.url http://www.apache.org/licenses/LICENSE-2.0.html

// @host localhost:8080
// @BasePath /api/v1

// @securityDefinitions.basic BasicAuth

// @securityDefinitions.apikey ApiKeyAuth
// @in header
// @name Authorization

// @securitydefinitions.oauth2.application OAuth2Application
// @tokenUrl https://example.com/oauth/token
// @scope.write Grants write access
// @scope.admin Grants read and write access to administrative information

// @securitydefinitions.oauth2.implicit OAuth2Implicit
// @authorizationurl https://example.com/oauth/authorize
// @scope.write Grants write access
// @scope.admin Grants read and write access to administrative information

// @securitydefinitions.oauth2.password OAuth2Password
// @tokenUrl https://example.com/oauth/token
// @scope.read Grants read access
// @scope.write Grants write access
// @scope.admin Grants read and write access to administrative information

// @securitydefinitions.oauth2.accessCode OAuth2AccessCode
// @tokenUrl https://example.com/oauth/token
// @authorizationurl https://example.com/oauth/authorize
// @scope.admin Grants read and write access to administrative information

// @x-extension-openapi {"example": "value on a json format"}

func main() {
	r := gin.Default()

	c := controller.NewController()

	v1 := r.Group("/api/v1")
	{
		accounts := v1.Group("/accounts")
		{
			accounts.GET(":id", c.ShowAccount)
			accounts.GET("", c.ListAccounts)
			accounts.POST("", c.AddAccount)
			accounts.DELETE(":id", c.DeleteAccount)
			accounts.PATCH(":id", c.UpdateAccount)
			accounts.POST(":id/images", c.UploadAccountImage)
		}
    //...
	}
	r.GET("/swagger/*any", ginSwagger.WrapHandler(swaggerFiles.Handler))
	r.Run(":8080")
}
//...
```

Additionally some general API info can be set dynamically. The generated code package `docs` exports `SwaggerInfo` variable which we can use to set the title, description, version, host and base path programatically. Example using Gin:

```go
package main

import (
	"github.com/gin-gonic/gin"
	"github.com/swaggo/files"
	"github.com/swaggo/gin-swagger"
	
	"./docs" // docs is generated by Swag CLI, you have to import it.
)

// @contact.name API Support
// @contact.url http://www.swagger.io/support
// @contact.email support@swagger.io

// @license.name Apache 2.0
// @license.url http://www.apache.org/licenses/LICENSE-2.0.html

// @termsOfService http://swagger.io/terms/

func main() {

	// programatically set swagger info
	docs.SwaggerInfo.Title = "Swagger Example API"
	docs.SwaggerInfo.Description = "This is a sample server Petstore server."
	docs.SwaggerInfo.Version = "1.0"
	docs.SwaggerInfo.Host = "petstore.swagger.io"
	docs.SwaggerInfo.BasePath = "/v2"
	docs.SwaggerInfo.Schemes = []string{"http", "https"}
		
	r := gin.New()

	// use ginSwagger middleware to serve the API docs
	r.GET("/swagger/*any", ginSwagger.WrapHandler(swaggerFiles.Handler))

	r.Run()
}
```

3. Add [API Operation](#api-operation) annotations in `controller` code

``` go
package controller

import (
	"fmt"
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
	"github.com/swaggo/swag/example/celler/httputil"
	"github.com/swaggo/swag/example/celler/model"
)

// ShowAccount godoc
// @Summary Show a account
// @Description get string by ID
// @ID get-string-by-int
// @Accept  json
// @Produce  json
// @Param id path int true "Account ID"
// @Success 200 {object} model.Account
// @Header 200 {string} Token "qwerty"
// @Failure 400 {object} httputil.HTTPError
// @Failure 404 {object} httputil.HTTPError
// @Failure 500 {object} httputil.HTTPError
// @Router /accounts/{id} [get]
func (c *Controller) ShowAccount(ctx *gin.Context) {
	id := ctx.Param("id")
	aid, err := strconv.Atoi(id)
	if err != nil {
		httputil.NewError(ctx, http.StatusBadRequest, err)
		return
	}
	account, err := model.AccountOne(aid)
	if err != nil {
		httputil.NewError(ctx, http.StatusNotFound, err)
		return
	}
	ctx.JSON(http.StatusOK, account)
}

// ListAccounts godoc
// @Summary List accounts
// @Description get accounts
// @Accept  json
// @Produce  json
// @Param q query string false "name search by q"
// @Success 200 {array} model.Account
// @Header 200 {string} Token "qwerty"
// @Failure 400 {object} httputil.HTTPError
// @Failure 404 {object} httputil.HTTPError
// @Failure 500 {object} httputil.HTTPError
// @Router /accounts [get]
func (c *Controller) ListAccounts(ctx *gin.Context) {
	q := ctx.Request.URL.Query().Get("q")
	accounts, err := model.AccountsAll(q)
	if err != nil {
		httputil.NewError(ctx, http.StatusNotFound, err)
		return
	}
	ctx.JSON(http.StatusOK, accounts)
}

//...
```

```console
$ swag init
```

4. Run your app, and browse to http://localhost:8080/swagger/index.html. You will see Swagger 2.0 Api documents as shown below:

![swagger_index.html](https://raw.githubusercontent.com/swaggo/swag/master/assets/swagger-image.png)

## Implementation Status

[Swagger 2.0 document](https://swagger.io/docs/specification/2-0/basic-structure/)

- [x] Basic Structure
- [x] API Host and Base Path
- [x] Paths and Operations
- [x] Describing Parameters
- [x] Describing Request Body
- [x] Describing Responses
- [x] MIME Types
- [x] Authentication
  - [x] Basic Authentication
  - [x] API Keys
- [x] Adding Examples
- [x] File Upload
- [x] Enums
- [x] Grouping Operations With Tags
- [ ] Swagger Extensions

# Declarative Comments Format

## General API Info

**Example**
[celler/main.go](https://github.com/swaggo/swag/blob/master/example/celler/main.go)

| annotation  | description                                | example                         |
|-------------|--------------------------------------------|---------------------------------|
| title       | **Required.** The title of the application.| // @title Swagger Example API   |
| version     | **Required.** Provides the version of the application API.| // @version 1.0  |
| description | A short description of the application.    |// @description This is a sample server celler server.         																 |
| tag.name    | Name of a tag.| // @tag.name This is the name of the tag                     |
| tag.description   | Description of the tag  | // @tag.description Cool Description         |
| tag.docs.url      | Url of the external Documentation of the tag | // @tag.docs.url https://example.com|
| tag.docs.description  | Description of the external Documentation of the tag| // @tag.docs.description Best example documentation |
| termsOfService | The Terms of Service for the API.| // @termsOfService http://swagger.io/terms/                     |
| contact.name | The contact information for the exposed API.| // @contact.name API Support  |
| contact.url  | The URL pointing to the contact information. MUST be in the format of a URL.  | // @contact.url http://www.swagger.io/support|
| contact.email| The email address of the contact person/organization. MUST be in the format of an email address.| // @contact.email support@swagger.io                                   |
| license.name | **Required.** The license name used for the API.|// @license.name Apache 2.0|
| license.url  | A URL to the license used for the API. MUST be in the format of a URL.                       | // @license.url http://www.apache.org/licenses/LICENSE-2.0.html |
| host        | The host (name or ip) serving the API.     | // @host localhost:8080         |
| BasePath    | The base path on which the API is served. | // @BasePath /api/v1             |
| schemes     | The transfer protocol for the operation that separated by spaces. | // @schemes http https |
| x-name      | The extension key, must be start by x- and take only json value | // @x-example-key {"key": "value"} |

### Using markdown descriptions
When a short string in your documentation is insufficient, or you need images, code examples and things like that you may want to use markdown descriptions. In order to use markdown descriptions use the following annotations.


| annotation  | description                                | example                         |
|-------------|--------------------------------------------|---------------------------------|
| title       | **Required.** The title of the application.| // @title Swagger Example API   |
| version     | **Required.** Provides the version of the application API.| // @version 1.0  |
| description.markdown  | A short description of the application. Parsed from the api.md file. This is an alternative to @description    |// @description.markdown No value needed, this parses the description from api.md         																 |
| tag.name    | Name of a tag.| // @tag.name This is the name of the tag                     |
| tag.description.markdown   | Description of the tag this is an alternative to tag.description. The description will be read from a file named like tagname.md  | // @tag.description.markdown         |



## API Operation

**Example**
[celler/controller](https://github.com/swaggo/swag/tree/master/example/celler/controller)


| annotation  | description                                                                                                                |
|-------------|----------------------------------------------------------------------------------------------------------------------------|
| description | A verbose explanation of the operation behavior.                                                                           |
| id          | A unique string used to identify the operation. Must be unique among all API operations.                                   |
| tags        | A list of tags to each API operation that separated by commas.                                                             |
| summary     | A short summary of what the operation does.                                                                                |
| accept      | A list of MIME types the APIs can consume. Value MUST be as described under [Mime Types](#mime-types).                     |
| produce     | A list of MIME types the APIs can produce. Value MUST be as described under [Mime Types](#mime-types).                     |
| param       | Parameters that separated by spaces. `param name`,`param type`,`data type`,`is mandatory?`,`comment` `attribute(optional)` |
| security    | [Security](#security) to each API operation.                                                                               |
| success     | Success response that separated by spaces. `return code`,`{param type}`,`data type`,`comment`                              |
| failure     | Failure response that separated by spaces. `return code`,`{param type}`,`data type`,`comment`                              |
| header      | Header in response that separated by spaces. `return code`,`{param type}`,`data type`,`comment`                            |
| router      | Path definition that separated by spaces. `path`,`[httpMethod]`                                                            |
| x-name      | The extension key, must be start by x- and take only json value.                                                           |

## Mime Types

`swag` accepts all MIME Types which are in the correct format, that is, match `*/*`.
Besides that, `swag` also accepts aliases for some MIME Types as follows:

| Alias                 | MIME Type                         |
|-----------------------|-----------------------------------|
| json                  | application/json                  |
| xml                   | text/xml                          |
| plain                 | text/plain                        |
| html                  | text/html                         |
| mpfd                  | multipart/form-data               |
| x-www-form-urlencoded | application/x-www-form-urlencoded |
| json-api              | application/vnd.api+json          |
| json-stream           | application/x-json-stream         |
| octet-stream          | application/octet-stream          |
| png                   | image/png                         |
| jpeg                  | image/jpeg                        |
| gif                   | image/gif                         |



## Param Type

- query
- path
- header
- body
- formData

## Data Type

- string (string)
- integer (int, uint, uint32, uint64)
- number (float32)
- boolean (bool)
- user defined struct

## Security
| annotation | description | parameters | example |
|------------|-------------|------------|---------|
| securitydefinitions.basic  | [Basic](https://swagger.io/docs/specification/2-0/authentication/basic-authentication/) auth.  |                                   | // @securityDefinitions.basic BasicAuth                      |
| securitydefinitions.apikey | [API key](https://swagger.io/docs/specification/2-0/authentication/api-keys/) auth.            | in, name                          | // @securityDefinitions.apikey ApiKeyAuth                    |
| securitydefinitions.oauth2.application  | [OAuth2 application](https://swagger.io/docs/specification/authentication/oauth2/) auth.       | tokenUrl, scope                   | // @securitydefinitions.oauth2.application OAuth2Application |
| securitydefinitions.oauth2.implicit     | [OAuth2 implicit](https://swagger.io/docs/specification/authentication/oauth2/) auth.          | authorizationUrl, scope           | // @securitydefinitions.oauth2.implicit OAuth2Implicit       |
| securitydefinitions.oauth2.password     | [OAuth2 password](https://swagger.io/docs/specification/authentication/oauth2/) auth.          | tokenUrl, scope                   | // @securitydefinitions.oauth2.password OAuth2Password       |
| securitydefinitions.oauth2.accessCode   | [OAuth2 access code](https://swagger.io/docs/specification/authentication/oauth2/) auth.       | tokenUrl, authorizationUrl, scope | // @securitydefinitions.oauth2.accessCode OAuth2AccessCode   |


| parameters annotation | example                                                  |
|-----------------------|----------------------------------------------------------|
| in                    | // @in header                                            |
| name                  | // @name Authorization                                   |
| tokenUrl              | // @tokenUrl https://example.com/oauth/token             |
| authorizationurl      | // @authorizationurl https://example.com/oauth/authorize |
| scope.hoge            | // @scope.write Grants write access                      |


## Attribute

```go
// @Param enumstring query string false "string enums" Enums(A, B, C)
// @Param enumint query int false "int enums" Enums(1, 2, 3)
// @Param enumnumber query number false "int enums" Enums(1.1, 1.2, 1.3)
// @Param string query string false "string valid" minlength(5) maxlength(10)
// @Param int query int false "int valid" mininum(1) maxinum(10)
// @Param default query string false "string default" default(A)
```

It also works for the struct fields:

```go
type Foo struct {
    Bar string `minLength:"4" maxLength:"16"`
    Baz int `minimum:"10" maximum:"20" default:"15"`
    Qux []string `enums:"foo,bar,baz"`
}
```

### Available

Field Name | Type | Description
---|:---:|---
<a name="parameterDefault"></a>default | * | Declares the value of the parameter that the server will use if none is provided, for example a "count" to control the number of results per page might default to 100 if not supplied by the client in the request. (Note: "default" has no meaning for required parameters.)  See https://tools.ietf.org/html/draft-fge-json-schema-validation-00#section-6.2. Unlike JSON Schema this value MUST conform to the defined [`type`](#parameterType) for this parameter.
<a name="parameterMaximum"></a>maximum | `number` | See https://tools.ietf.org/html/draft-fge-json-schema-validation-00#section-5.1.2.
<a name="parameterMinimum"></a>minimum | `number` | See https://tools.ietf.org/html/draft-fge-json-schema-validation-00#section-5.1.3.
<a name="parameterMaxLength"></a>maxLength | `integer` | See https://tools.ietf.org/html/draft-fge-json-schema-validation-00#section-5.2.1.
<a name="parameterMinLength"></a>minLength | `integer` | See https://tools.ietf.org/html/draft-fge-json-schema-validation-00#section-5.2.2.
<a name="parameterEnums"></a>enums | [\*] | See https://tools.ietf.org/html/draft-fge-json-schema-validation-00#section-5.5.1.
<a name="parameterFormat"></a>format | `string` | The extending format for the previously mentioned [`type`](#parameterType). See [Data Type Formats](#dataTypeFormat) for further details.

### Future

Field Name | Type | Description
---|:---:|---
<a name="parameterMultipleOf"></a>multipleOf | `number` | See https://tools.ietf.org/html/draft-fge-json-schema-validation-00#section-5.1.1.
<a name="parameterPattern"></a>pattern | `string` | See https://tools.ietf.org/html/draft-fge-json-schema-validation-00#section-5.2.3.
<a name="parameterMaxItems"></a>maxItems | `integer` | See https://tools.ietf.org/html/draft-fge-json-schema-validation-00#section-5.3.2.
<a name="parameterMinItems"></a>minItems | `integer` | See https://tools.ietf.org/html/draft-fge-json-schema-validation-00#section-5.3.3.
<a name="parameterUniqueItems"></a>uniqueItems | `boolean` | See https://tools.ietf.org/html/draft-fge-json-schema-validation-00#section-5.3.4.
<a name="parameterCollectionFormat"></a>collectionFormat | `string` | Determines the format of the array if type array is used. Possible values are: <ul><li>`csv` - comma separated values `foo,bar`. <li>`ssv` - space separated values `foo bar`. <li>`tsv` - tab separated values `foo\tbar`. <li>`pipes` - pipe separated values <code>foo&#124;bar</code>. <li>`multi` - corresponds to multiple parameter instances instead of multiple values for a single instance `foo=bar&foo=baz`. This is valid only for parameters [`in`](#parameterIn) "query" or "formData". </ul> Default value is `csv`.

## Examples

### Descriptions over multiple lines

You can add descriptions spanning multiple lines in either the general api description or routes definitions like so: 

```go
// @description This is the first line
// @description This is the second line
// @description And so forth.
```

### User defined structure with an array type

```go
// @Success 200 {array} model.Account <-- This is a user defined struct.
```

```go
package model

type Account struct {
    ID   int    `json:"id" example:"1"`
    Name string `json:"name" example:"account name"`
}
```
### Add a headers in response

```go
// @Success 200 {string} string	"ok"
// @Header 200 {string} Location "/entity/1"
// @Header 200 {string} Token "qwerty"
```

### Use multiple path params

```go
/// ...
// @Param group_id path int true "Group ID"
// @Param account_id path int true "Account ID"
// ...
// @Router /examples/groups/{group_id}/accounts/{account_id} [get]
```

### Example value of struct

```go
type Account struct {
    ID   int    `json:"id" example:"1"`
    Name string `json:"name" example:"account name"`
    PhotoUrls []string `json:"photo_urls" example:"http://test/image/1.jpg,http://test/image/2.jpg"`
}
```

### Description of struct

```go
type Account struct {
	// ID this is userid
	ID   int    `json:"id"`
	Name string `json:"name"` // This is Name
}
```

### Use swaggertype tag to supported custom type
[#201](https://github.com/swaggo/swag/issues/201#issuecomment-475479409)

```go
type TimestampTime struct {
    time.Time
}

///implement encoding.JSON.Marshaler interface
func (t *TimestampTime) MarshalJSON() ([]byte, error) {
    bin := make([]byte, 16)
    bin = strconv.AppendInt(bin[:0], t.Time.Unix(), 10)
    return bin, nil
}

func (t *TimestampTime) UnmarshalJSON(bin []byte) error {
    v, err := strconv.ParseInt(string(bin), 10, 64)
    if err != nil {
        return err
    }
    t.Time = time.Unix(v, 0)
    return nil
}
///

type Account struct {
    // Override primitive type by simply specifying it via `swaggertype` tag
    ID     sql.NullInt64 `json:"id" swaggertype:"integer"`

    // Override struct type to a primitive type 'integer' by specifying it via `swaggertype` tag
    RegisterTime TimestampTime `json:"register_time" swaggertype:"primitive,integer"`

    // Array types can be overridden using "array,<prim_type>" format
    Coeffs []big.Float `json:"coeffs" swaggertype:"array,number"`
}
```

[#379](https://github.com/swaggo/swag/issues/379)
```go
type CerticateKeyPair struct {
	Crt []byte `json:"crt" swaggertype:"string" format:"base64" example:"U3dhZ2dlciByb2Nrcw=="`
	Key []byte `json:"key" swaggertype:"string" format:"base64" example:"U3dhZ2dlciByb2Nrcw=="`
}
```
generated swagger doc as follows:
```go
"api.MyBinding": {
  "type":"object",
  "properties":{
    "crt":{
      "type":"string",
      "format":"base64",
      "example":"U3dhZ2dlciByb2Nrcw=="
    },
    "key":{
      "type":"string",
      "format":"base64",
      "example":"U3dhZ2dlciByb2Nrcw=="
    }
  }
}

```

### Add extension info to struct field

```go
type Account struct {
    ID   string    `json:"id"   extensions:"x-nullable,x-abc=def"` // extensions fields must start with "x-"
}
```

generate swagger doc as follows:

```go
"Account": {
    "type": "object",
    "properties": {
        "id": {
            "type": "string",
            "x-nullable": true,
            "x-abc": "def"
        }
    }
}
```

### How to using security annotations

General API info.

```go
// @securityDefinitions.basic BasicAuth

// @securitydefinitions.oauth2.application OAuth2Application
// @tokenUrl https://example.com/oauth/token
// @scope.write Grants write access
// @scope.admin Grants read and write access to administrative information
```

Each API operation.

```go
// @Security ApiKeyAuth
```

Make it AND condition

```go
// @Security ApiKeyAuth
// @Security OAuth2Application[write, admin]
```

## About the Project
This project was inspired by [yvasiyarov/swagger](https://github.com/yvasiyarov/swagger) but we simplified the usage and added support a variety of [web frameworks](#supported-web-frameworks). Gopher image source is [tenntenn/gopher-stickers](https://github.com/tenntenn/gopher-stickers). It has licenses [creative commons licensing](http://creativecommons.org/licenses/by/3.0/deed.en).
## Contributors

This project exists thanks to all the people who contribute. [[Contribute](CONTRIBUTING.md)].
<a href="https://github.com/swaggo/swag/graphs/contributors"><img src="https://opencollective.com/swag/contributors.svg?width=890&button=false" /></a>


## Backers

Thank you to all our backers! 🙏 [[Become a backer](https://opencollective.com/swag#backer)]

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## Sponsors

Support this project by becoming a sponsor. Your logo will show up here with a link to your website. [[Become a sponsor](https://opencollective.com/swag#sponsor)]

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## License
[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Fswaggo%2Fswag.svg?type=large)](https://app.fossa.io/projects/git%2Bgithub.com%2Fswaggo%2Fswag?ref=badge_large)
