APIDoc

Current version: beta-0.3.3

Generate RESTful API documentation from GO source files into the OpenAPI v3.0.2 specification (formal Swagger 2.0 Specification).

Summary

APIDoc extracts the API documentation annotation from your GO source files, recursively resoles struct references, and it generates the YAML OpenAPI v3.0.2 spec. file, which could be tested in the Swagger Editor and quickly integrated with Swagger UI.

The generator is also able to read gorilla/mux Handler and HandlerFunc func signature to automatically generate the @router tag, and @param tag/s. See gorilla/mux Handler Functions.

Note: It does not generate/support all OpenAPI v3.0.2 blocks, the tool handles just a subset required by our internal needs, it might be extended if there will be high demand on extension, or if anyone would like to contribute.

Examples

Basic API Project

Getting Started

Add annotation into your API source code files, See API Annotation in Comments.
Get the APIDoc by using:
```
go get -u github.com/spaceavocado/apidoc
```
This will create a binary in your $GOPATH/bin folder called apidoc (Mac/Unix) or apidoc.exe (Windows).
Now you can run apidoc command from your shell.

Make sure that $GOPATH/bin is in your Environment Variables:
- Linux:
```
export PATH=$PATH:$GOPATH/bin
```
  Note: assumption that your have correctly set $GOPATH env. variable.
- Windows: "Control Panel" > "System" > "Edit the system environment variables" > "Advanced" > "Environment Variables" > "Path" > "Edit". and add the directory.
Run apidoc in the your project's root folder. This will extract and process your annotation and it generates the output YAML file.
```
apidoc -m main.go -e handler -o docs/api
```
Note: the example shows the default flag values, for more details, See APIDoc CLI.
Preview the documentation in the Swagger Editor, i.e. put the openapi.yaml content into the editor.

API Annotation in Comments

An API annotation is represented as an code comment starting with @ symbol followed by documentation tag and it value or parameters. Examples:

// @title Example RESTful API, tag title with value "Example RESTful API"
// @server api.domain.com/v3 Production, tag server with params: "api.domain.com/v3", "Production"

The the value of the tag or the last parameter of the tag captures the multiline comments, example:

// @desc Lorem ipsum dolor sit amet, consectetur adipiscing
// elit. Nullam rhoncus magna nunc, in faucibus metus pulvinar
// et. Mauris pellentesque

The value of desc tag is captured as: "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam rhoncus magna nunc, in faucibus metus pulvinar et. Mauris pellentesque"

// @server api.domain.com/v3 Lorem ipsum dolor sit amet, consectetur
// elit. Nullam rhoncus magna nunc.

The last parameter, description of the server tag is captured as: "Lorem ipsum dolor sit amet, consectetur elit. Nullam rhoncus magna nunc."

Main Section

This section should be located in the main file, passed to the APIDoc CLI in -m flag (defaults to main.go).

Supported Tags

Note: () within Annotation indicates an annotation parameter captured by the generator.

Annotation	Description	OpenAPI Spec.	Example
title (value)	REQUIRED. The title of the application.	https://swagger.io/specification/#infoObject field: title	// @title Example RESTful API
desc (value)	A short description of the application.	https://swagger.io/specification/#infoObject field: description	// @desc An example of publicly accessible API
ver (value)	REQUIRED. The version of the OpenAPI document	https://swagger.io/specification/#infoObject field: version	// @ver 1.0.0
terms (value)	A URL to the Terms of Service for the API.	https://swagger.io/specification/#infoObject field: termsOfService	// @terms https://domain.com/api/terms
contact.name (value)	The identifying name of the contact person/organization.	https://swagger.io/specification/#contactObject field: name	// @contact.name API Support
contact.url (value)	The URL pointing to the contact information.	https://swagger.io/specification/#contactObject field: url	// @contact.url https://domain.com/api/support
contact.email (value)	The email address of the contact person/organization.	https://swagger.io/specification/#contactObject field: email	// @contact.email [email protected]
lic.name (value)	The license name used for the API.	https://swagger.io/specification/#licenseObject field: name	// @lic.name Apache 2.0
lic.url (value)	A URL to the license used for the API.	https://swagger.io/specification/#licenseObject field: url	// @lic.url https://www.apache.org/licenses/LICENSE-2.0.html
server (url) (description)	An object representing a Server Note: There might be many @server tags within the main section.	https://swagger.io/specification/#serverObject	// @server api.domain.com/v3 Production

Example

// @title An example authentication API
// @desc Publicly accessible authentication REST API.
// @terms https://domain.com/docs/api/terms
//
// @contact.name API Support
// @contact.url https://domain.com/contact
// @contact.email [email protected]
//
// @lic.name Apache 2.0
// @lic.url https://www.apache.org/licenses/LICENSE-2.0.html
//
// @ver 1.0
// @server https://auth.domain.com/v3 Production API
// @server https://auth.dev.domain.com/v3 Development API
func main() {}

An Endpoint

An endpoint is being considered as a API comment annotation block found within any file located inside the endpoints root folder, passed to the APIDoc CLI in -e flag (defaults to ./).

For better performance is highly recommended to pass the endpoints root folder as a flag to the CLI to avoid unnecessary file processing.

Supported Tags

Note: () within Annotation indicates an annotation parameter captured by the generator.

Annotation	Description	OpenAPI Spec.	Example
summary (value)	A short summary of what the operation does.	https://swagger.io/specification/#operationObject field: summary	@sumamry Lorem ipsum dolor
desc (value)	A verbose explanation of the operation behavior.	https://swagger.io/specification/#operationObject field: description	@desc Lorem ipsum dolor sit amet, consectetur adipiscing eli
id (value)	Unique string used to identify the operation. The id MUST be unique among all operations described in the API. The operationId value is case-sensitive.	https://swagger.io/specification/#operationObject field: operationId	// @id login
tag (array)	A list of tags for API documentation control. Tags can be used for logical grouping of operations by resources or any other qualifier. Note: Comma separated value, or a single value.	https://swagger.io/specification/#operationObject field: tags	// @tag User // @tag User, Authentication
accept (array)	A list of accepted request content mime types See Mime Types Annotation	n/a	// @accept json // @accept application/json, application/x-www-form-urlencoded
produce (array)	REQUIRED. A list of supported content response mime types See Mime Types Annotation	n/a	// @produce json // @produce application/json, application/x-www-form-urlencoded
param (name) (in) {(type)} (required) (description)	Describes a single operation parameter. See Param Tag Note: There might be many @param tags within the endpoint block.	https://swagger.io/specification/#parameterObject	// @param token path {string} true Security Token
body (reference)	Describes a single request body. See Body Tag	https://swagger.io/specification/#requestBodyObject	//@body model.Login
swrap (reference) (field pointer)	Success object wrapper. If this tag is set, any success response object is being wrapped with this object on the desired pointer field See Wrapper Tag	n/a	// @swrap response.Success
success (code) {(type)} (reference or empty) (description)	REQUIRED. Describes a single success response from an API Operation. See Response Tag	https://swagger.io/specification/#responseObject	// @success 200 {object} response.Success OK // @success 200 {string} OK
fwrap (reference) (field pointer)	Failure object wrapper. If this tag is set, any failure response object is being wrapped with this object on the desired pointer field See Wrapper Tag	n/a	// @fwrap response.Error
failure (code) {(type)} (reference or empty) (description)	Describes a single failure response from an API Operation. See Response Tag	https://swagger.io/specification/#responseObject	// @failure 401 {object} response.AuthError Unauthorized // @failure 401 {string} Unauthorized
subrouter (value)	Name of the subrouter used for this endpoint. See gorilla/mux Subrouter	n/a	// @subrouter user [post]
router (path) [(method)]	REQUIRED. Describes the operations available on a single path, i.e. endpoint URL See Path Tag	https://swagger.io/specification/#pathItemObject	// @router /login [post]

Param Tag

Annotation: param (name) (in) {(type)} (required) (description)

This section contains detailed information about the param tag

name

The name of the parameter. Parameter names are case sensitive.
If in is "path", the name field MUST correspond to the associated router url parameter, e.g.: // @param token path {string} true Security token must match with // @router /auth/{token} [get]

in

The location of the parameter. Possible values are "query", "header", "path" or "cookie".

type

the outer "{}" are used just as visual separators of type field, i.e. their are not required. E.g. // @param token path {string} true Security token = // @param token path string true Security token
Param tag does not support struct type, just base go types, See Type Mapping
Array annotation: {[]string}, {[]int}, etc.

Body Tag

Annotation: body (reference)

reference

go structure used as request model, example: // @body model.Login

// Login struct located in "model" package,
// referenced in the go file where the endpoint
// annotation is set
type Login struct {
  // User's email address
  Username string `json:"username"`
  Password string
}

will be resolved as:

schema:
  type: object
  parameters:
    username:
      type: string
      description: User's email address
    password:
      type: string

The reference structure is being resolved recursively, i.e. it might contain fields referencing other go struct.
See Struct Annotation for more details.

Wrapper Tag

Annotation: swrap (reference) (pointer field), fwrap (reference) (field pointer)

If this tag is set, any success/failure response object is being wrapped with this object on the desired pointer field. This is useful if you are using a generic API response object with various data field.

Example

type APISuccess struct {
  Status string `json:"status"`
  Data interface{} `json:"data"`
}
type Profile struct {
  Firstname int `json:"firstname"`
  Lastname string `json:"lastname"`
}

// @swrap APISuccess data and // @success 200 {object} Profile OK will produce:

"200":
  description: OK
  content:
    application/json:
      schema:
        type: object
        properties:
          status:
            type: string
          data:
            schema:
              $ref: "#/components/schemas/Profile"

The reference structure is being resolved recursively, i.e. it might contain fields referencing other go struct.
See Struct Annotation for more details.

Response Tag

Annotation: success (code) {(type)} (reference or string) (description), failure (code) {(type)} (reference or string) (description)

code

Any valid HTTP reponse code

type

The outer "{}" are used just as visual separators of type field, i.e. their are not required. E.g. // @success 200 {string} string OK = // @success 200 string string OK
Supported: object, string
- if set to object, the next parameter expected is reference
- if set to string, next parameter is skipped (reference)

reference

Reference response go struct
Array annotation: {[]response.Car}, etc.
The reference structure is being resolved recursively, i.e. it might contain fields referencing other go struct.
See Struct Annotation for more details.

Path Tag

Annotation: router (path) [(method)]

path

It might contain the "path" parameters, it this format: /login/{token} where token is the name of param defined in the Param Tag.

method

HTTP method
The outer "[]" are used just as visual separators of method field, i.e. their are not required. E.g. // @router /login [post] = // @router /login post
It might contain an array of methods, e.g.: [post, put]

Example Endpoint Annotation

// Login request
// @summary Login user
// @desc Authentication request
// @id login
// @tag Authentication
// @accept json, application/x-www-form-urlencoded
// @produce json
// @body model.Login
// @swrap response.Data data
// @success 200 {object} request.Token OK
// @failure 401 {object} response.Error Unauthorized.
// See error code and error message for more details.
// @failure 500 {string} Internal Server Error
// @router /login [post]
func handler(w http.ResponseWriter, r *http.Request) {}

// @summary Activate user
// @desc User activation via the token request.
// @id activate
// @tag Registration
// @param token path {string} true Activation token
// @produce json
// @success 200 {string} OK
// @failure 500 {string} Internal Server Error
// @router /registration/activate/{token} [get]
func handler(w http.ResponseWriter, r *http.Request) {}

// Handlers with passed gorilla mux router
//
// In this example the @router tag is being resolved
// from the HandleFunc or Handle gorilla *mux.Router func.
// @param tags ara also resolved from the func path string.
//
// These tags will be extracted automatically:
// @router /person/{id} [get]
// @param id path {string} true
func Handlers(r *mux.Router) {
  // GetPerson handler
  // @summary Person
  // @desc Get person by ID.
  // @id person
  // @tag Person
  // @produce json
  // @success 200 {object} Person OK
  // @failure 500 {string} Internal Server Error
  r.HandleFunc("/person/{id:[0-9]+}", GetPerson).Methods("GET")
}

gorilla/mux Handler Functions

@router tag and @param tags could automatically resolved if the endpoint annotation is placed above the gorilla/mux Handler or HandlerFunc function:

// GetPerson handler
// @summary Person
// @desc Get person by ID.
// @id person
// @tag Person
// @produce json
// @success 200 {object} Person OK
// @failure 500 {string} Internal Server Error
r.HandleFunc("/person/{id:[0-9]+}", GetPerson).Methods("GET")

Automatically resolved tags will be be:

@router /person/{id} [get]
@param id path {string} true

Notes

This process is skipped if the endpoint annotation contains the @router tag
If the endpoint annotation contains a @param tag found in the func path parameter, it is not being overwritten by the this process nor double annotated.
Please see gorilla/mux Subrouter section for more information how to work with gorilla/mux subrouters.

gorilla/mux Subrouter

An endpoint can use subrouter tag to connect a endpoint with the subrouter to resolve the final endpoint URL.

Subrouter Annotation

Annotation	Description	Example
router (name)	Name of the subrouter.	// @router account
subrouter (name)	Name of the parent subrouter.	// @subrouter admin

The annotation must be placed above the gorilla.mux Subrouter method anywhere within the Main file or in any file within the endpoints root folder.

Example

// @router admin
r.PathPrefix("/admin").Subrouter()

// @router user
// @subrouter admin
r.PathPrefix("/user").Subrouter()

// @summary List of users
// @produce json
// @success 200 {object} Person OK
// @subrouter user
r.HandleFunc("/list", GetPersonList).Methods("GET")

The URL resolved for the "List of users" endpoint will be /admin/user/list

Mime Types Annotation

Mime Type	Annotation
text/plain	text, text/plain
text/html	html, text/html
text/xml	xml, text/xml
application/json	json, application/json
application/x-www-form-urlencoded	form, application/x-www-form-urlencoded
multipart/form-data	multipart, multipart/form-data
application/vnd.api+json	json-api, application/vnd.api+json
application/x-json-stream	json-stream, application/x-json-stream
application/octet-stream	octet-stream, application/octet-stream
image/png	png, image/png
image/jpeg	jpeg, image/jpeg
image/jpeg	jpg, image/jpeg
image/gif	gif, image/gif

Struct Annotation

type Profile struct {
  // User's email
  Username string `json:"username" required:"true"`
  Status UserStatus `apitype:"int"`
}
type UserStatus int

Comment above the field is being captured as field "description"
json:"x" overrides the field name
apitype:"x" overrides the field type
required:"true" marks the field as required

Data Types Conversion

Go types are being converted into OpenAPI accepted format

go Type	Converted Type
byte	integer
rune	integer
int	integer
int8	integer
int16	integer
int32	integer
int64	integer
uint	integer
uint8	integer
uint16	integer
uint32	integer
uint64	integer
uintptr	integer
float32	number
float64	number
bool	boolean

Tips

Annotation over Multiple Lines

Last parameter of any tag is could spread over multiple lines, e.g.:

// @desc Lorem ipsum dolor sit amet, consectetur adipiscing
// elit. Nullam rhoncus magna nunc, in faucibus metus pulvinar
// et. Mauris pellentesque enim justo

// @failure 500 {string} Lorem ipsum dolor sit amet, consectetur
// adipiscing elit. Nullam rhoncus magna nunc, in faucibus metus
// pulvinar et. Mauris pellentesque enim justo.

Array References

Use [] annotation in from of the reference.

// @body []request.Person

// @success 200 {object} []response.Person OK

And Endpoint With Many Decralarions

An endpoint, with the same URL could be declared separately with different methods, and the generator will properly group them.

Example

// @summary Get User
// @param id path {int} true User ID
// @produce text
// @success 200 {string} OK
// @router /user/{id} [post]

// ...

// @summary Delete User
// @param id path {int} true User ID
// @produce text
// @success 200 {string} OK
// @router /user/{id} [delete]

will produce

/user/{id}:
  get:
    summary: Get User
    parameters:
    - name: id
      description: User ID
      in: path
      required: true
      schema:
        type: integer
    responses:
      "200":
        description: OK
        content:
          plain/text:
            schema:
              type: string
  delete:
    summary: Delete User
    parameters:
    - name: id
      description: User ID
      in: path
      required: true
      schema:
        type: integer
    responses:
      "200":
        description: OK
        content:
          plain/text:
            schema:
              type: string

APIDoc CLI

Run the apidoc -h to all flags and commands:

API Documentation Generator

Usage:
   [flags]
   [command]

Available Commands:
  help        Help about any command
  version     Show the APIDoc version

Flags:
  -e, --endpoints string   Root endpoints folder (default "./")
  -h, --help               Help for this command
  -m, --main string        Main API documentation file (default "main.go")
  -o, --output string      Documentation output folder (default "docs/api")
  -v, --verbose            Show generation warnings

Use " [command] --help" for more information about a command.

About the Project

This project was inspired by swaggo/swag, designed mainly to handle our API documentation needs, i.e. add support for response wrappers, generate OpenAPI v3.X documentation. Any feedback, contribution to this project is welcomed.

The project is in a beta phase, therefore there might be major changes in near future, the annotation should stay the same, though.

Contributing

When contributing to this repository, please first discuss the change you wish to make via issue, email, or any other method with the owners of this repository before making a change.

Pull Request Process

Fork it
Create your feature branch (git checkout -b ft/new-feature-name)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin ft/new-feature-name)
Create new Pull Request

Please make an issue first if the change is likely to increase.

License

APIDoc is released under the Apache 2.0 license. See LICENSE.txt

Name		Name	Last commit message	Last commit date
Latest commit History 26 Commits
app		app
assets		assets
cmd		cmd
example		example
extract		extract
misc		misc
output		output
reference		reference
token		token
.gitignore		.gitignore
.travis.yml		.travis.yml
LICENSE.txt		LICENSE.txt
go.test.sh		go.test.sh
main.go		main.go
main_test.go		main_test.go
readme.md		readme.md

License

paysuper/apidoc

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Latest commit

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APIDoc

Table of Contents

Summary

Examples

Getting Started

API Annotation in Comments

Main Section

Supported Tags

Example

An Endpoint

Supported Tags

Param Tag

name

in

type

Body Tag

reference

Wrapper Tag

Example

Response Tag

code

type

reference

Path Tag

path

method

Example Endpoint Annotation

gorilla/mux Handler Functions

Notes

gorilla/mux Subrouter

Subrouter Annotation

Example

Mime Types Annotation

Struct Annotation

Data Types Conversion

Tips

Annotation over Multiple Lines

Array References

And Endpoint With Many Decralarions

Example

APIDoc CLI

About the Project

Contributing

Pull Request Process

License

About

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