spec

KO | EN

gitlite — search

#python #ai #typescript #android #machine-learning #linux #docker #nodejs #windows #cli #awesome-list #security #openai #open-source

(★ 117)

⚡A lightweight, framework-agnostic OpenAPI 3.x specification builder for Go.

파일 탐색기

최종 버전 다운로드 (.zip)

- - bug_report.md
  - feature_request.md
- - ci.yml
- PULL_REQUEST_TEMPLATE.md
- - go.mod
  - go.sum
  - README.md
  - route.go
  - router.go
  - router_test.go
  - types.go
- - go.mod
  - go.sum
  - README.MD
  - route.go
  - router.go
  - router_test.go
  - types.go
- - go.mod
  - go.sum
  - README.MD
  - route.go
  - router.go
  - router_test.go
  - types.go
- - go.mod
  - go.sum
  - README.md
  - route.go
  - router.go
  - router_test.go
  - types.go
- - go.mod
  - go.sum
  - README.md
  - route.go
  - router.go
  - router_test.go
  - types.go
- - go.mod
  - go.sum
  - README.md
  - route.go
  - router.go
  - router_test.go
  - types.go
- - go.mod
  - go.sum
  - README.md
  - route.go
  - router.go
  - router_test.go
  - types.go
- - go.mod
  - go.sum
  - README.md
  - route.go
  - router.go
  - router_test.go
  - types.go
- - go.mod
  - go.sum
  - README.md
  - route.go
  - router.go
  - router_test.go
  - types.go
- README.md
- - go.mod
  - go.sum
  - main.go
  - openapi.yaml
- - dto.go
  - go.mod
  - go.sum
  - main.go
  - openapi.yaml
  - README.md
  - router.go
- - builder.go
  - builder_test.go
  - operation.go
  - operation_test.go
  - utils.go
  - utils_test.go
- - specui.go
  - specui_test.go
- - converter.go
  - converter_test.go
  - exposer_test.go
  - reflect_test.go
  - reflector.go
  - reflector_test.go
  - tags.go
  - tags_test.go
  - utils.go
  - utils_test.go
- - types.go
  - types_test.go
- - audit_test.go
  - common_test.go
  - components.go
  - components_test.go
  - document.go
  - document_test.go
  - errors.go
  - errors_test.go
  - method.go
  - method_test.go
  - operation.go
  - operation_test.go
  - path.go
  - path_test.go
  - reference.go
  - reference_test.go
  - schema.go
  - schema_test.go
  - utils.go
  - utils_test.go
  - warning_test.go
- codec.go
- codec_test.go
- config.go
- document.go
- media.go
- operation.go
- path.go
- schema.go
- content.go
- group.go
- openapi.go
- operation.go
- option_test.go
- reflector.go
- security.go
- server.go
- util.go
- - colon_param_parser.go
  - colon_param_parser_test.go
- anonymous_structs.v30.yaml
- anonymous_structs.v31.yaml
- anonymous_structs.v32.yaml
- basic_data_types.v30.yaml
- basic_data_types.v31.yaml
- basic_data_types.v32.yaml
- compatibility_extensions.v31.yaml
- complex_types.v30.yaml
- complex_types.v31.yaml
- complex_types.v32.yaml
- composition.v30.yaml
- composition.v31.yaml
- composition.v32.yaml
- custom_path_parser.v30.yaml
- custom_path_parser.v31.yaml
- custom_path_parser.v32.yaml
- embed_ref.v30.yaml
- embed_ref.v31.yaml
- embed_ref.v32.yaml
- generics.v30.yaml
- generics.v31.yaml
- generics.v32.yaml
- multipart_binary.v30.yaml
- multipart_binary.v31.yaml
- multipart_binary.v32.yaml
- multiple_content_types.v30.yaml
- multiple_content_types.v31.yaml
- multiple_content_types.v32.yaml
- nested_structures.v30.yaml
- nested_structures.v31.yaml
- nested_structures.v32.yaml
- openapi_312_reference_descriptions.v31.yaml
- openapi_320_features.v32.yaml
- openapi_320_operations.v32.yaml
- path_parameters.v30.yaml
- path_parameters.v31.yaml
- path_parameters.v32.yaml
- petstore.v30.yaml
- petstore.v31.yaml
- petstore.v32.yaml
- request_response.v30.yaml
- request_response.v31.yaml
- request_response.v32.yaml
- security.v30.yaml
- security.v31.yaml
- security.v32.yaml
- server_variables.v30.yaml
- server_variables.v31.yaml
- server_variables.v32.yaml
- spec_information.v30.yaml
- spec_information.v31.yaml
- spec_information.v32.yaml
- trailing_slash.v30.yaml
- trailing_slash.v31.yaml
- trailing_slash.v32.yaml
- webhook_helpers.v31.yaml
- webhook_helpers.v32.yaml
.gitignore
.golangci.yml
AGENTS.md
CHANGELOG.md
CLAUDE.md
CODE_OF_CONDUCT.md
CONTRIBUTING.md
errors.go
errors_test.go
go.mod
go.sum
go.work
golden_test.go
lefthook.yml
LICENSE
Makefile
petstore_test.go
README.md
RELEASE.md
router.go
router_internal_test.go
router_test.go
SECURITY.md
types.go

// repository documentation

Was this content helpful?

★ 0 (0 ratings)

# oaswrap/spec

[![CI](https://github.com/oaswrap/spec/actions/workflows/ci.yml/badge.svg)](https://github.com/oaswrap/spec/actions/workflows/ci.yml)
[![codecov](https://codecov.io/gh/oaswrap/spec/graph/badge.svg?token=RIEIM9BAIW)](https://codecov.io/gh/oaswrap/spec)
[![Go Reference](https://pkg.go.dev/badge/github.com/oaswrap/spec.svg)](https://pkg.go.dev/github.com/oaswrap/spec)
[![Go Version](https://img.shields.io/github/go-mod/go-version/oaswrap/spec)](https://github.com/oaswrap/spec/blob/main/go.mod)
[![License](https://img.shields.io/github/license/oaswrap/spec)](https://raw.githubusercontent.com/oaswrap/spec/main/LICENSE)

Code-first, framework-agnostic OpenAPI 3.x spec builder for Go. Generate docs from route registrations and Go structs — no annotations, no vendor lock-in.

---

## Why oaswrap/spec?

- **Native OpenAPI builder** — paths, operations, components, validation, and schema reflection are all implemented in this repository without third-party OpenAPI dependencies.
- **Framework-agnostic core** — use `spec.NewRouter` for static generation, or drop in adapters for Chi, Echo, Gin, Fiber, net/http, and Mux.
- **Code-first route documentation** — register routes and their documentation together using Go functions and typed options.
- **Version-aware output** — defaults to OpenAPI `3.1.2`, with full support for `3.0.x` and `3.2.0` features when selected.
- **Direct model escape hatches** — use typed `openapi` structs, `Extensions` for `x-*` fields, and `Extra` for official or future fields not yet wrapped by a helper option.
- **Deterministic output** — generated documents are stable enough for golden-file snapshot tests and CI documentation checks.

---

## Features

- JSON and YAML generation.
- Framework-agnostic route registration with `NewRouter`, groups, route builders, and HTTP method helpers.
- Webhook registration helpers for OpenAPI `3.1.x` and `3.2.0`.
- OpenAPI `3.2.0` `QUERY` method and additional operation support.
- Request and response schema reflection from Go structs.
- Parameter reflection from `path`, `query`, `header`, `cookie`, and OpenAPI `3.2.0` `querystring` tags.
- JSON Schema/OpenAPI schema tags for examples, enums, constraints, nullability, read/write flags, content metadata, and XML metadata.
- Security helpers for API key, HTTP bearer/basic-style schemes, OAuth2, OpenID Connect, and mutual TLS.
- Duplicate response merging into `oneOf`.
- Low-level typed OpenAPI model for direct field control.
- `spec.OneOf` for explicit one-of schemas.
- `SchemaExposer` and `StaticSchemaExposer` hooks for custom reflected schemas.
- `InterceptSchema` hook for type-level schema customization and override.
- `InterceptProp` hook for field-level property filtering and modification.
- `RequiredPropByValidateTag` option to derive `required` from `validate` struct tags.
- `encoding.TextMarshaler`/`TextUnmarshaler` types automatically reflected as `type: string`.
- `EmbedReferencer` interface and `refer:"true"` tag for embedded struct `allOf $ref` instead of field inlining.

---

## Installation

Requirements:

- Go `1.22+`

```bash
go get -u github.com/oaswrap/spec
```

---

## Quick Start

```go
package main

import (
	"log"

"github.com/oaswrap/spec"
	"github.com/oaswrap/spec/openapi"
	"github.com/oaswrap/spec/option"
)

func main() {
	r := spec.NewRouter(
		option.WithOpenAPIVersion(openapi.Version320),
		option.WithTitle("Users API"),
		option.WithVersion("1.0.0"),
		option.WithServer("https://api.example.com"),
		option.WithSecurity("bearerAuth", option.SecurityHTTPBearer("bearer")),
	)

v1 := r.Group("/api/v1", option.GroupTags("users"))
	v1.Post("/login",
		option.Summary("Login"),
		option.Request(new(LoginRequest)),
		option.Response(200, new(LoginResponse)),
	)
	v1.Get("/users/{id}",
		option.Summary("Get user"),
		option.Request(new(GetUserRequest)),
		option.Response(200, new(User)),
	)

if err := r.WriteSchemaTo("openapi.yaml"); err != nil {
		log.Fatal(err)
	}
}

type LoginRequest struct {
	Username string `json:"username" required:"true"`
	Password string `json:"password" required:"true" writeOnly:"true"`
}

type LoginResponse struct {
	Token string `json:"token" required:"true"`
}

type GetUserRequest struct {
	ID string `path:"id" required:"true" description:"User identifier"`
}

type User struct {
	ID   string `json:"id" required:"true"`
	Name string `json:"name"`
}
```

---

## Output

`spec.NewRouter` and `spec.NewGenerator` expose the following output methods:

| Method | Description |
| --- | --- |
| `GenerateSchema()` | Defaults to YAML. |
| `GenerateSchema("yaml")` / `GenerateSchema("yml")` | Returns YAML. |
| `GenerateSchema("json")` | Returns pretty-printed JSON. |
| `MarshalYAML()` | Validates and serializes YAML. |
| `MarshalJSON()` | Validates and serializes pretty-printed JSON. |
| `WriteSchemaTo("openapi.yaml")` | Infers format from file extension (`.yaml`, `.yml`, `.json`). |
| `Document()` | Returns the built `*openapi.Document`. |
| `Validate()` | Builds the document and checks OpenAPI invariants. Returns only `SeverityError` findings. |
| `ValidateReport()` | Builds and validates, returning all findings including warnings and info as `ValidationErrors`. |
| `Config()` | Returns the effective OpenAPI configuration. |

---

## Framework Adapters

Use the core `spec` package for static generation and CI workflows. Use an adapter when you want route registration, spec generation, and docs UI wiring in a single framework-specific router.

| Framework | Package |
| --- | --- |
| Chi | [`chiopenapi`](/adapter/chiopenapi) |
| Echo v4 | [`echoopenapi`](/adapter/echoopenapi) |
| Echo v5 | [`echov5openapi`](/adapter/echov5openapi) |
| Fiber v2 | [`fiberopenapi`](/adapter/fiberopenapi) |
| Fiber v3 | [`fiberv3openapi`](/adapter/fiberv3openapi) |
| Gin | [`ginopenapi`](/adapter/ginopenapi) |
| Iris | [`irisopenapi`](/adapter/irisopenapi) |
| net/http | [`httpopenapi`](/adapter/httpopenapi) |
| Mux | [`muxopenapi`](/adapter/muxopenapi) |

Adapter module import paths:

- `github.com/oaswrap/spec/adapter/chiopenapi`
- `github.com/oaswrap/spec/adapter/echoopenapi`
- `github.com/oaswrap/spec/adapter/echov5openapi`
- `github.com/oaswrap/spec/adapter/fiberopenapi`
- `github.com/oaswrap/spec/adapter/fiberv3openapi`
- `github.com/oaswrap/spec/adapter/ginopenapi`
- `github.com/oaswrap/spec/adapter/irisopenapi`
- `github.com/oaswrap/spec/adapter/httpopenapi`
- `github.com/oaswrap/spec/adapter/muxopenapi`

---

## OpenAPI Options

Root options are passed to `spec.NewRouter` or `spec.NewGenerator`.

```go
r := spec.NewRouter(
	option.WithOpenAPIVersion(openapi.Version312),
	option.WithTitle("Payments API"),
	option.WithInfoSummary("Payments API"),
	option.WithVersion("1.4.0"),
	option.WithDescription("Payment operations."),
	option.WithTermsOfService("https://example.com/terms"),
	option.WithContact(openapi.Contact{Name: "API Team", Email: "api@example.com"}),
	option.WithLicense(openapi.License{Name: "Apache 2.0", URL: "https://www.apache.org/licenses/LICENSE-2.0.html"}),
	option.WithExternalDocs("https://docs.example.com", "Full documentation"),
	option.WithServer("https://api.example.com", option.ServerDescription("Production")),
	option.WithTag("payments", option.TagDescription("Payment operations")),
	option.WithStripTrailingSlash(),
)
```

| Option | Purpose |
| --- | --- |
| `WithOpenAPIConfig(opts...)` | Build an `*openapi.Config` with defaults and apply options. |
| `WithOpenAPIVersion(version)` | Set `openapi`; default is `openapi.Version312`. Constants are available for `3.0.0`–`3.0.4`, `3.1.0`–`3.1.2`, and `3.2.0`. |
| `WithSelf(uri)` | Set OpenAPI `3.2.0` `$self`. |
| `WithJSONSchemaDialect(uri)` | Set root `jsonSchemaDialect`. |
| `WithTitle(title)` | Set `info.title`. |
| `WithInfoSummary(summary)` | Set `info.summary`. |
| `WithVersion(version)` | Set `info.version`. |
| `WithDescription(description)` | Set `info.description`. |
| `WithContact(contact)` | Set `info.contact`. |
| `WithLicense(license)` | Set `info.license`. |
| `WithTermsOfService(url)` | Set `info.termsOfService`. |
| `WithTags(tags...)` | Add root `tags` from `openapi.Tag` values. |
| `WithTag(name, tagOpts...)` | Add one root tag without constructing `openapi.Tag` manually. |
| `WithServer(url, opts...)` | Add a root server. |
| `WithExternalDocs(url, description...)` | Set root `externalDocs`. |
| `WithSecurity(name, opts...)` | Add a reusable security scheme. |
| `WithGlobalSecurity(name, scopes...)` | Add a root security requirement. |
| `WithReflectorConfig(opts...)` | Configure schema reflection. |
| `WithStripTrailingSlash(strip...)` | Trim trailing slashes from operation paths except `/`. |
| `WithPathParser(parser)` | Convert framework-style paths, e.g. `:id` → `{id}`. |
| `WithDocument(fn)` | Mutate the final low-level document before validation and serialization. |
| `WithComponentSchema(name, schema)` | Register a reusable schema component. |
| `WithComponentResponse(name, response)` | Register a reusable response component. |
| `WithComponentParameter(name, parameter)` | Register a reusable parameter component. |
| `WithComponentExample(name, example)` | Register a reusable example component. |
| `WithComponentRequestBody(name, requestBody)` | Register a reusable request body component. |
| `WithComponentHeader(name, header)` | Register a reusable header component. |
| `WithComponentSecurityScheme(name, scheme)` | Register a reusable security scheme component. |
| `WithComponentLink(name, link)` | Register a reusable link component. |
| `WithComponentCallback(name, callback)` | Register a reusable callback component. |
| `WithComponentPathItem(name, pathItem)` | Register a reusable path item component. |
| `WithComponentMediaType(name, mediaType)` | Register a reusable media type component (OpenAPI `3.2.0`). |
| `WithDisableDocs(disable...)` | Disable adapter docs endpoints. |
| `WithDocsPath(path)` | Set adapter docs UI path. |
| `WithSpecPath(path)` | Set adapter OpenAPI spec path. |
| `WithCacheAge(cacheAge)` | Set docs/spec cache age. |
| `WithUIOption(opt)` | Set a low-level `spec-ui` option. |
| `WithSwaggerUI(cfg...)` | Use Swagger UI. |
| `WithStoplightElements(cfg...)` | Use Stoplight Elements. |
| `WithReDoc(cfg...)` | Use ReDoc. |
| `WithScalar(cfg...)` | Use Scalar. |
| `WithRapiDoc(cfg...)` | Use RapiDoc. |

> Adapter-only options: `WithDisableDocs`, `WithDocsPath`, `WithSpecPath`, `WithCacheAge`, `WithUIOption`, `WithSwaggerUI`, `WithStoplightElements`, `WithReDoc`, `WithScalar`, and `WithRapiDoc` affect adapter docs/spec endpoints, not core static generation output.

**Tag options:** `TagSummary`, `TagDescription`, `TagExternalDocs`, `TagParent` (3.2.0), `TagKind` (3.2.0).

**Server options:** `ServerDescription`, `ServerVariables`, `ServerName` (3.2.0).

---

## Routes and Groups

```go
api := r.Group("/api/v1", option.GroupTags("v1"))

api.Get("/users/{id}",
	option.OperationID("getUser"),
	option.Summary("Get user"),
	option.Description("Returns one user."),
	option.Tags("users"),
	option.Security("bearerAuth"),
	option.Request(new(GetUserRequest)),
	option.Response(200, new(User), option.ContentDescription("OK")),
	option.Response(404, nil, option.ContentDescription("Not Found")),
)
```

**Router methods:**

`Get`, `Post`, `Put`, `Delete`, `Patch`, `Options`, `Head`, `Trace`, `Query` (3.2.0), `Add`, `Webhook` (3.1.x+), `AddWebhook` (3.1.x+), `NewRoute(...).Method(...).Path(...).With(...)`, `Group`, `Route`, `With`.

**Group options:**

| Option | Purpose |
| --- | --- |
| `GroupTags(tags...)` | Apply tags to all routes in the group. |
| `GroupSecurity(name, scopes...)` | Apply an operation security requirement to all routes in the group. |
| `GroupDeprecated(deprecated...)` | Mark all routes in the group as deprecated. |
| `GroupHidden(hide...)` | Exclude all routes in the group from the generated document. |

**Operation options:**

| Option | Purpose |
| --- | --- |
| `OperationID(id)` | Set `operationId`. |
| `Summary(summary)` | Set `summary`; also sets `description` when description is empty. |
| `Description(description)` | Set `description`. |
| `ExternalDocs(url, description...)` | Set operation `externalDocs`. |
| `Tags(tags...)` | Add operation tags. |
| `Security(name, scopes...)` | Add an operation security requirement. |
| `Deprecated(deprecated...)` | Mark the operation deprecated. |
| `Hidden(hide...)` | Exclude the operation from the generated document. |
| `Request(structure, contentOpts...)` | Add parameters and/or a request body from a Go value. |
| `Response(status, structure, contentOpts...)` | Add a response. Duplicate status/content pairs are merged into `oneOf`. |
| `CustomizeOperation(fn)` | Mutate the low-level `openapi.Operation` directly. |

**Content options:**

| Option | Purpose |
| --- | --- |
| `ContentType(contentType)` | Set media type; default is `application/json`. |
| `ContentDescription(description)` | Set request/response description. |
| `ContentSummary(summary)` | Set request/response summary (OpenAPI `3.2.0`). |
| `ContentDefault(isDefault...)` | Mark response as `default`. |
| `ContentEncoding(prop, enc)` | Add media type encoding metadata for a property. |
| `ContentExample(value)` | Set media type `example`. |
| `ContentNamedExample(name, value, opts...)` | Add one named media type example. |
| `ContentExamples(examples)` | Set media type `examples`. |
| `ContentRequired(required...)` | Mark request body as required. |
| `ContentFormat(format)` | Override the reflected content schema format. |

**Example options:** `ExampleSummary`, `ExampleDescription`, `ExampleExternalValue`, `ExampleDataValue` (3.2.0), `ExampleSerializedValue` (3.2.0).

---

## Security

```go
r := spec.NewRouter(
	option.WithSecurity("apiKey", option.SecurityAPIKey("X-API-Key", openapi.SecuritySchemeAPIKeyInHeader)),
	option.WithSecurity("bearerAuth", option.SecurityHTTPBearer("bearer")),
	option.WithSecurity("mtls", option.SecurityMutualTLS()),
	option.WithSecurity("oauth2", option.SecurityOAuth2AuthorizationCode(
		"https://auth.example.com/oauth/authorize",
		"https://auth.example.com/oauth/token",
		map[string]string{
			"read":  "Read access",
			"write": "Write access",
		},
	)),
	option.WithSecurity("oidc", option.SecurityOpenIDConnect("https://auth.example.com/.well-known/openid-configuration")),
)
```

**Security helpers:**

- `SecurityAPIKey(name, in)`
- `SecurityHTTPBearer(scheme, bearerFormat...)`
- `SecurityOAuth2(flows)`
- `SecurityOAuth2Implicit(authorizationURL, scopes, flowOpts...)`
- `SecurityOAuth2Password(tokenURL, scopes, flowOpts...)`
- `SecurityOAuth2ClientCredentials(tokenURL, scopes, flowOpts...)`
- `SecurityOAuth2AuthorizationCode(authorizationURL, tokenURL, scopes, flowOpts...)`
- `SecurityOAuth2DeviceAuthorization(deviceAuthorizationURL, tokenURL, scopes, flowOpts...)` — OpenAPI `3.2.0`
- `OAuthRefreshURL(url)`
- `SecurityOpenIDConnect(url)`
- `SecurityMutualTLS()`
- `SecurityDescription(description)`
- `SecurityOAuth2MetadataURL(url)` — OpenAPI `3.2.0`
- `SecurityDeprecated(deprecated...)` — OpenAPI `3.2.0`

---

## Reflection Tags

Request structs are split into parameters and request body:

- Fields with `path`, `query`, `header`, `cookie`, or `querystring` tags become OpenAPI parameters.
- `querystring` is only valid for OpenAPI `3.2.0`.
- Body fields use `json` names by default; for `application/x-www-form-urlencoded` and `multipart/form-data` they use `form` names, falling back to `json`.
- `json:"-"` skips a field.
- Path parameters are always marked required.
- Adapter packages can add framework-specific parameter tags with `ParameterTagMapping` (e.g. Gin uses `uri`, Fiber uses `params`, Echo uses `param`).

```go
type SearchRequest struct {
	ID       string `path:"id" required:"true" description:"Resource ID"`
	Status   string `query:"status" enum:"active,inactive"`
	TraceID  string `header:"X-Trace-ID"`
	Session  string `cookie:"session"`
	Name     string `json:"name" minLength:"2" maxLength:"80"`
	File     []byte `form:"file" format:"binary" description:"Upload file"`
	Internal string `json:"-"`
}
```

**Naming and location tags:**

| Tag | Purpose |
| --- | --- |
| `json:"name"` | Body/schema property name. |
| `path:"name"` | Path parameter. |
| `query:"name"` | Query parameter. |
| `header:"name"` | Header parameter. |
| `cookie:"name"` | Cookie parameter. |
| `querystring:"name"` | OpenAPI `3.2.0` whole-query-string parameter. |
| `mediaType:"..."` | Media type for `querystring` parameter content; defaults to `application/x-www-form-urlencoded`. OpenAPI `3.2.0` only. |
| `form:"name"` | Form body property name for form content types. |

**Schema tags:**

| Tag | Output |
| --- | --- |
| `required:"true"` | Adds property to parent `required`; path parameters are required automatically. |
| `type:"string,null"` | Overrides `type`; comma-separated unions emitted only for OpenAPI `3.1.x`/`3.2.0`. |
| `title:"..."` | `title`. |
| `description:"..."` | `description`. |
| `format:"email"` | `format`. |
| `pattern:"..."` | `pattern`. |
| `default:"..."` | `default`; JSON values are decoded when valid. |
| `example:"..."` | `example`; JSON values are decoded when valid. |
| `examples:"[...]"` | `examples` for OpenAPI `3.1.x`/`3.2.0`; JSON array preferred, comma-separated fallback. |
| `enum:"a,b,c"` | `enum`; JSON array or comma-separated values. |
| `const:"..."` | `const` for OpenAPI `3.1.x`/`3.2.0`. |
| `multipleOf:"2"` | `multipleOf`. |
| `maximum:"100"` | `maximum`. |
| `minimum:"1"` | `minimum`. |
| `exclusiveMaximum:"true"` | OpenAPI `3.0.x`: boolean; OpenAPI `3.1.x`/`3.2.0`: numeric value. |
| `exclusiveMinimum:"true"` | OpenAPI `3.0.x`: boolean; OpenAPI `3.1.x`/`3.2.0`: numeric value. |
| `maxLength:"80"` | `maxLength`. |
| `minLength:"2"` | `minLength`. |
| `maxItems:"10"` | `maxItems`. |
| `minItems:"1"` | `minItems`. |
| `maxProperties:"10"` | `maxProperties`. |
| `minProperties:"1"` | `minProperties`. |
| `uniqueItems:"true"` | `uniqueItems`. |
| `nullable:"true"` | `nullable` for OpenAPI `3.0.x`; `type: [T, null]` for OpenAPI `3.1.x`/`3.2.0` when possible. |
| `deprecated:"true"` | `deprecated`. |
| `readOnly:"true"` | `readOnly`. |
| `writeOnly:"true"` | `writeOnly`. |
| `contentEncoding:"base64"` | `contentEncoding` for OpenAPI `3.1.x`/`3.2.0`. |
| `contentMediaType:"image/png"` | `contentMediaType` for OpenAPI `3.1.x`/`3.2.0`. |
| `xmlName:"name"` | XML object `name`. |
| `xmlNamespace:"uri"` | XML object `namespace`. |
| `xmlPrefix:"p"` | XML object `prefix`. |
| `xmlAttribute:"true"` | XML object `attribute`; skipped when OpenAPI `3.2.0` `xmlNodeType` is set. |
| `xmlWrapped:"true"` | XML object `wrapped`; skipped when OpenAPI `3.2.0` `xmlNodeType` is set. |
| `xmlNodeType:"element"` | OpenAPI `3.2.0` XML object `nodeType`. |

> Reflection intentionally omits keywords that are invalid for the selected OpenAPI version. For example, `const`, `examples`, `contentEncoding`, and `contentMediaType` are not emitted for OpenAPI `3.0.x`.

---

## Reflected Go Types

| Go type | Schema |
| --- | --- |
| `bool` | `type: boolean` |
| Signed integers (except `int64`) | `type: integer`, `format: int32` |
| `int64` | `type: integer`, `format: int64` |
| `uint8`, `uint16` | `type: integer`, `format: int32`, `minimum: 0` |
| `uint`, `uint32`, `uint64`, `uintptr` | `type: integer`, `format: int64`, `minimum: 0` |
| `float32` | `type: number`, `format: float` |
| `float64` | `type: number`, `format: double` |
| `string` | `type: string` |
| `time.Time` | `type: string`, `format: date-time` |
| `[]T`, `[N]T` | `type: array`, `items: T` |
| `[]byte` | `3.0.x`: `type: string`, `format: byte`; `3.1.x`/`3.2.0`: `type: string`, `contentEncoding: base64` |
| `map[string]T` | `type: object`, `additionalProperties: T` |
| Structs | `type: object`, `properties` |
| Named structs (component mode) | `#/components/schemas/{TypeName}` reference |
| `encoding.TextMarshaler` + `TextUnmarshaler` (no `json.Marshaler`) | `type: string` |
| Pointers | Nullable schema behavior |

Custom types can expose their own schema when tags are not expressive enough:

```go
type Slug string

func (*Slug) OpenAPISchema(version string) *openapi.Schema {
	if version == openapi.Version304 {
		return &openapi.Schema{Type: "string", Format: "slug"}
	}
	return &openapi.Schema{Type: []string{"string", "null"}, Format: "slug"}
}
```

For static schemas, implement `OpenAPISchema() *openapi.Schema` instead. Field tags are still applied on top of custom schemas.

### Embedded struct references

By default, anonymous embedded struct fields are inlined into the parent schema. To emit an `allOf $ref` instead, use the `refer:"true"` tag or implement `openapi.EmbedReferencer` on the embedded type:

```go
// Via struct tag
type Request struct {
    Base `refer:"true"`
    Name string `json:"name"`
}

// Via interface (useful when you own the embedded type)
type Base struct {
    ID int `json:"id"`
}

func (Base) ReferEmbedded() {}
```

Both produce:
```yaml
Request:
  type: object
  properties:
    name:
      type: string
  allOf:
    - $ref: '#/components/schemas/Base'
```

---

## Reflector Configuration

```go
r := spec.NewRouter(
	option.WithReflectorConfig(
		option.InlineRefs(),
		option.StripDefNamePrefix("DTO"),
		option.TypeMapping(NullString{}, new(string)),
		option.ParameterTagMapping(openapi.ParameterInPath, "params"),
		option.InterceptDefName(func(t reflect.Type, defaultName string) string {
			return defaultName
		}),
		option.InterceptSchema(func(params openapi.InterceptSchemaParams) (stop bool, err error) {
			if params.Processed {
				params.Schema.Extensions = map[string]any{"x-go-type": params.Type.String()}
			}
			return false, nil
		}),
		option.InterceptProp(func(params openapi.InterceptPropParams) error {
			if params.Processed && params.Field.Tag.Get("internal") == "true" {
				return openapi.ErrSkipProperty
			}
			return nil
		}),
		option.RequiredPropByValidateTag(), // marks fields required when validate tag contains "required"
	),
)
```

| Option | Purpose |
| --- | --- |
| `InlineRefs(inline...)` | Inline schemas instead of using component references for named structs. |
| `StripDefNamePrefix(prefixes...)` | Strip prefixes from generated component names. |
| `TypeMapping(src, dst)` | Reflect `src` as if it were `dst`. |
| `ParameterTagMapping(in, sourceTag)` | Override the struct tag for a parameter location or body. Use `openapi.ParameterInBody` to replace `json` tag, `openapi.ParameterInForm` to replace `form` tag. |
| `InterceptDefName(fn)` | Customize schema component names. |
| `InterceptSchema(fn)` | Hook called before and after each type is reflected. Pre-call (`Processed=false`): return `stop=true` to override schema entirely. Post-call (`Processed=true`): modify the built schema. |
| `InterceptProp(fn)` | Hook called before and after each struct field is reflected. Return `openapi.ErrSkipProperty` to exclude the field. |
| `RequiredPropByValidateTag(tag, sep...)` | Mark properties as required when their `validate` tag (or custom tag) contains `"required"`. Default tag: `validate`, default separator: `,`. |

---

## OpenAPI 3.2

Selecting `openapi.Version320` enables the following additional features:

- `Router.Query(path, opts...)` — new `QUERY` HTTP method.
- Custom HTTP methods via `Add`, emitted as `additionalOperations`.
- `querystring` parameter tags.
- Root `$self` field.
- Server `name` field.
- Response `summary` field.
- Tag `parent` and `kind` fields.
- Security scheme metadata and deprecation fields.
- `components.mediaTypes`.
- Media type and encoding fields: `itemSchema`, `prefixEncoding`, `itemEncoding`.
- Discriminator `defaultMapping`.
- Example `dataValue` and `serializedValue` fields.
- XML `nodeType`.

---

## Low-Level OpenAPI Control

The `openapi` package exposes typed low-level OpenAPI structs. Use them when a feature does not require reflection or doesn't yet have a convenience option.

```go
r := spec.NewRouter(
	option.WithOpenAPIVersion(openapi.Version320),
	option.WithTitle("API"),
	option.WithVersion("1.0.0"),
	option.WithDocument(func(doc *openapi.Document) {
		doc.Webhooks = map[string]*openapi.PathItem{
			"user.created": {
				Post: &openapi.Operation{
					Responses: map[string]*openapi.Response{
						"202": {Description: "Accepted"},
					},
				},
			},
		}
		doc.Extensions = map[string]any{"x-company": "oaswrap"}
		doc.Extra = map[string]any{"futureOfficialField": true}
	}),
)
```

- Use `Extensions` for `x-*` specification extensions.
- Use `Extra` to emit official or future fields not yet typed.
- Use `CustomizeOperation` to mutate an operation directly.
- Use `WithDocument` to mutate the final document before output.

> The library validates many OpenAPI invariants but does not attempt exhaustive semantic validation for every rule in the specification.

---

## Examples

Complete working examples are in the [`examples/`](examples/) directory:

- **[Basic](examples/basic/)** — standalone spec generation.
- **[Petstore](examples/petstore/)** — full Petstore API with routes and models.
- **Adapter examples** — framework-specific examples in [`adapter/*/example`](adapter/).

---

## API Reference

Full documentation is available at [pkg.go.dev/github.com/oaswrap/spec](https://pkg.go.dev/github.com/oaswrap/spec).

| Package | Purpose |
| --- | --- |
| [`spec`](https://pkg.go.dev/github.com/oaswrap/spec) | Core router and spec builder. |
| [`openapi`](https://pkg.go.dev/github.com/oaswrap/spec/openapi) | Owned OpenAPI model. |
| [`option`](https://pkg.go.dev/github.com/oaswrap/spec/option) | Configuration options. |
| [`pkg/parser`](https://pkg.go.dev/github.com/oaswrap/spec/pkg/parser) | Path parsers such as `NewColonParamParser`. |

---

## Contributing

Issues and pull requests are welcome. Please check existing issues and discussions before starting work on new features.

---

## License

[MIT](LICENSE)

---

## Acknowledgements

- [swaggest/openapi-go](https://github.com/swaggest/openapi-go) and [swaggest/jsonschema-go](https://github.com/swaggest/jsonschema-go) — parts of this library's reflection design are inspired by their work.

spec

파일 탐색기

오늘의 추천 프로젝트

Was this content helpful?

Recent Feedback

spec

파일 탐색기

오늘의 추천 프로젝트

Was this content helpful?

Recent Feedback

Download README