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Swagger Parser

NOTE: If you're looking for swagger-parser 1.X and OpenAPI 2.0, please refer to v1 branch

Build Master - Java 8, 11, and 14

Table of contents

Overview

This is the Swagger Parser project, which parses OpenAPI definitions in JSON or YAML format into swagger-core representation as Java POJO, returning any validation warnings/errors.

It also provides a simple framework to add additional converters from different formats into the Swagger objects, making the entire toolchain available.

Usage

Using the Swagger Parser is simple. Once included in your project, you can read a OpenAPI Specification from any location:

import io.swagger.parser.OpenAPIParser;
import io.swagger.v3.parser.OpenAPIV3Parser;
import io.swagger.v3.parser.core.models.SwaggerParseResult;
import io.swagger.v3.oas.models.OpenAPI;

// ... your code

  // parse a swagger description from the petstore and get the result
  SwaggerParseResult result = new OpenAPIParser().readLocation("https://petstore3.swagger.io/api/v3/openapi.json", null, null);
  
  // or from a file
  //   SwaggerParseResult result = new OpenAPIParser().readLocation("./path/to/openapi.yaml", null, null);
  
  // the parsed POJO
  OpenAPI openAPI = result.getOpenAPI();
  
  if (result.getMessages() != null) result.getMessages().forEach(System.err::println); // validation errors and warnings
  
  if (openAPI != null) {
    ...
  }
  

or from a string:

import io.swagger.parser.OpenAPIParser;
import io.swagger.v3.parser.OpenAPIV3Parser;
import io.swagger.v3.parser.core.models.SwaggerParseResult;
import io.swagger.v3.oas.models.OpenAPI;

// ... your code

  // parse a swagger description from the petstore and get the result
  SwaggerParseResult result = new OpenAPIParser().readContents("https://petstore3.swagger.io/api/v3/openapi.json", null, null);
  
  // or from a file
  //   SwaggerParseResult result = new OpenAPIParser().readContents("./path/to/openapi.yaml", null, null);
  
  // the parsed POJO
  OpenAPI openAPI = result.getOpenAPI();
  
  if (result.getMessages() != null) result.getMessages().forEach(System.err::println); // validation errors and warnings
  
  if (openAPI != null) {
    ...
  }
  

If you are providing a Swagger/OpenAPI 2.0 document to the parser , e.g.:

SwaggerParseResult result = new OpenAPIParser().readContents("./path/to/swagger.yaml", null, null);

the Swagger/OpenAPI 2.0 document will be first converted into a comparable OpenAPI 3.0 one.

You can also directly use OpenAPIV3Parser which only handles OpenAPI 3.0 documents, and provides a convenience method to get directly the parsed `OpenAPI object:

import io.swagger.v3.parser.OpenAPIV3Parser;
import io.swagger.v3.oas.models.OpenAPI;

// ... your code

  // read a swagger description from the petstore
    
  OpenAPI openAPI = new OpenAPIV3Parser().read("https://petstore3.swagger.io/api/v3/openapi.json");
  

Adding to your project

You can include this library from Sonatype OSS for SNAPSHOTS, or Maven central for releases. In your dependencies:

<dependency>
  <groupId>io.swagger.parser.v3</groupId>
  <artifactId>swagger-parser</artifactId>
  <version>2.1.3</version>
</dependency>

Prerequisites

You need the following installed and available in your $PATH:

After cloning the project, you can build it from source with this command:

mvn package

Authentication

If your OpenAPI definition is protected, you can pass headers in the request:

import io.swagger.v3.parser.core.models.AuthorizationValue;

// ... your code

  // build a authorization value
  AuthorizationValue mySpecialHeader = new AuthorizationValue()
    .keyName("x-special-access")  //  the name of the authorization to pass
    .value("i-am-special")        //  the value of the authorization
    .type("header");              //  the location, as either `header` or `query`

  // or in a single constructor
  AuthorizationValue apiKey = new AuthorizationValue("api_key", "special-key", "header");
  OpenAPI openAPI = new OpenAPIV3Parser().readWithInfo(
    "https://petstore3.swagger.io/api/v3/openapi.json",
    Arrays.asList(mySpecialHeader, apiKey)
  );

Dealing with self-signed SSL certificates

If you're dealing with self-signed SSL certificates, or those signed by GoDaddy, you'll need to disable SSL Trust Manager. That's done by setting a system environment variable as such:

export TRUST_ALL=true

And then the Swagger Parser will ignore invalid certificates. Of course this is generally a bad idea, but if you're working inside a firewall or really know what you're doing, well, there's your rope.

Dealing with Let's Encrypt

Depending on the version of Java that you use, certificates signed by the Let's Encrypt certificate authority may not work by default. If you are using any version of Java prior to 1.8u101, you most likely must install an additional CA in your JVM. Also note that 1.8u101 may not be sufficient on it's own. Some users have reported that certain operating systems are not accepting Let's Encrypt signed certificates.

Your options include:

  • Accepting all certificates per above
  • Installing the certificate manually in your JVM using the keystore using the keytool command
  • Configuring the JVM on startup to load your certificate

But... this is all standard SSL configuration stuff and is well documented across the web.

Options

Parser uses options as a way to customize the behavior while parsing:

1. resolve:

ParseOptions parseOptions = new ParseOptions();
parseOptions.setResolve(true); 
final OpenAPI openAPI = new OpenAPIV3Parser().read("a.yaml", null, parseOptions);
  • When remote or relative references are found in the parsed document, parser will attempt to:
  1. resolve the reference in the remote or relative location
  2. parse the resolved reference
  3. add the resolved "component" (e.g. parameter, schema, response, etc.) to the resolved OpenAPI POJO components section
  4. replace the remote/relative reference with a local reference, e.g. : #/components/schemas/NameOfRemoteSchema.

This applies to schemas, parameters, responses, pretty much everything containing a ref.

2. resolveFully:

ParseOptions parseOptions = new ParseOptions();
parseOptions.setResolve(true); // implicit
parseOptions.setResolveFully(true);
final OpenAPI openAPI = new OpenAPIV3Parser().read("a.yaml", null, parseOptions);
  • In some scenarios, after references are resolved (with resolve, see above), you might need to have all local references removed replacing the reference with the content of the referenced element. This is for example used in Swagger Inflector. Be aware that the result could be more heavy/long due to duplication

Original document:

a.yaml

openapi: 3.0.1
paths:
  "/newPerson":
    post:
      summary: Create new person
      description: Create new person
      responses:
        '200':
          description: ok
          content:
            "*/*":
              schema:
                "$ref": "./ref-without-component/b.yaml#/components/schemas/CustomerType"

b.yaml

openapi: 3.0.1
components:
  schemas:
    CustomerType:
      type: string
      example: Example value

Serialized result after parsing with option resolveFully(true)

a.yaml

openapi: 3.0.1
servers:
- url: /
paths:
  /newPerson:
    post:
      summary: Create new person
      description: Create new person
      responses:
        200:
          description: ok
          content:
            '*/*':
              schema:
                type: string
                example: Example value
components:
  schemas:
    CustomerType:
      type: string
      example: Example value

3. flatten:

ParseOptions parseOptions = new ParseOptions();
parseOptions.setFlatten(true); 
final OpenAPI openAPI = new OpenAPIV3Parser().read("a.yaml", null, parseOptions);

This is kind of the opposite of resolveFully, limited to defined schemas.

In some scenarios, you might need to have all schemas defined inline (e.g. a response schema) moved to the components/schemas section and replaced with a reference to the newly added schema within components/schemas. This is for example used in Swagger Codegen.

Original document:

flatten.yaml

openapi: 3.0.0
info:
  version: 1.0.0
  title: Swagger Petstore
  license:
    name: MIT
paths:
  /pets:
    get:
      summary: List all pets
      operationId: listPets
      responses:
        '200':
          description: An paged array of pets
          headers:
            x-next:
              description: A link to the next page of responses
              schema:
                type: string
          content:
            application/json:
              schema:
                 type: object
                 properties:
                    id:
                      type: integer
                      format: int64
                    name:
                      type: string
                    tag:
                      type: string

Serialized result after parsing with option flatten(true)

openapi: 3.0.0
info:
  title: Swagger Petstore
  license:
    name: MIT
  version: 1.0.0
servers:
- url: /
paths:
  /pets:
    get:
      tags:
      - pets
      summary: List all pets
      responses:
        200:
          description: An paged array of pets
          headers:
            x-next:
              description: A link to the next page of responses
              style: simple
              explode: false
              schema:
                type: string
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/inline_response_200'
components:
  schemas:
    inline_response_200:
      type: object
      properties:
        id:
          type: integer
          format: int64
        name:
          type: string
        tag:
          type: string

4. resolveCombinators:

ParseOptions parseOptions = new ParseOptions();
parseOptions.setResolve(true); // implicit
parseOptions.setResolveFully(true);
parseOptions.setResolveCombinators(false); // default is true 
final OpenAPI openAPI = new OpenAPIV3Parser().read("a.yaml", null, parseOptions);

This option (only available with resolveFully = true) allows to customize behaviour related to allOf/anyOf/oneOf (composed schemas) processing. With option set to true (default), composed schemas are transformed into "non composed" ones, by having all properties merged into a single resulting schema (see example below). If option is set to false, the resulting schema will instead maintain its "composed" nature, keeping properties within e.g. the allOf members.

Please see examples below:

Unresolved yaml

openapi: 3.0.1
servers:
- url: http://petstore.swagger.io/api

info:
  description: 'This is a sample server Petstore'
  version: 1.0.0
  title: testing source file
  termsOfService: http://swagger.io/terms/

paths:
  "/withInvalidComposedModel":
    post:
      operationId: withInvalidComposedModel
      requestBody:
        content:
          "application/json":
            schema:
              "$ref": "#/components/schemas/ExtendedAddress"
        required: false
      responses:
        '200':
          description: success!
components:
  schemas:
    ExtendedAddress:
      type: object
      allOf:
        - $ref: '#/components/schemas/Address'
        - type: object
          required:
          - gps
          properties:
            gps:
              type: string
    Address:
      required:
      - street
      type: object
      properties:
        street:
          type: string
          example: 12345 El Monte Road
        city:
          type: string
          example: Los Altos Hills
        state:
          type: string
          example: CA
        zip:
          type: string
          example: '94022'

resolvedCombinator = true (default) - Test case

@Test
    public void resolveAllOfWithoutAggregatingParameters(@Injectable final List<AuthorizationValue> auths) {
        ParseOptions options = new ParseOptions();
        options.setResolveFully(true);
        options.setResolveCombinators(true);

        // Testing components/schemas
        OpenAPI openAPI = new OpenAPIV3Parser().readLocation("src/test/resources/composed.yaml",auths,options).getOpenAPI();
        
        ComposedSchema allOf = (ComposedSchema) openAPI.getComponents().getSchemas().get("ExtendedAddress");
        assertEquals(allOf.getAllOf().size(), 2);

        assertTrue(allOf.getAllOf().get(0).get$ref() != null);
        assertTrue(allOf.getAllOf().get(1).getProperties().containsKey("gps"));


        // Testing path item
        ObjectSchema schema = (ObjectSchema) openAPI.getPaths().get("/withInvalidComposedModel").getPost().getRequestBody().getContent().get("application/json").getSchema();

        assertEquals(schema.getProperties().size(), 5);
        assertTrue(schema.getProperties().containsKey("street"));
        assertTrue(schema.getProperties().containsKey("gps"));

    }

resolvedCombinator = true (default) - Resolved Yaml

openapi: 3.0.1
info:
  title: testing source file
  description: This is a sample server Petstore
  termsOfService: http://swagger.io/terms/
  version: 1.0.0
servers:
- url: http://petstore.swagger.io/api
paths:
  /withInvalidComposedModel:
    post:
      operationId: withInvalidComposedModel
      requestBody:
        content:
          application/json:
            schema:
              required:
              - gps
              - street
              type: object
              properties:
                street:
                  type: string
                  example: 12345 El Monte Road
                city:
                  type: string
                  example: Los Altos Hills
                state:
                  type: string
                  example: CA
                zip:
                  type: string
                  example: "94022"
                gps:
                  type: string
        required: false
      responses:
        200:
          description: success!
components:
  schemas:
    ExtendedAddress:
      type: object
      allOf:
      - $ref: '#/components/schemas/Address'
      - required:
        - gps
        type: object
        properties:
          gps:
            type: string
    Address:
      required:
      - street
      type: object
      properties:
        street:
          type: string
          example: 12345 El Monte Road
        city:
          type: string
          example: Los Altos Hills
        state:
          type: string
          example: CA
        zip:
          type: string
          example: "94022"

resolvedCombinator = false - Test case

@Test
   public void resolveAllOfWithoutAggregatingParameters(@Injectable final List<AuthorizationValue> auths) {
       ParseOptions options = new ParseOptions();
       options.setResolveFully(true);
       options.setResolveCombinators(false);

       // Testing components/schemas
       OpenAPI openAPI = new OpenAPIV3Parser().readLocation("src/test/resources/composed.yaml",auths,options).getOpenAPI();
      
       ComposedSchema allOf = (ComposedSchema) openAPI.getComponents().getSchemas().get("ExtendedAddress");
       assertEquals(allOf.getAllOf().size(), 2);
       assertTrue(allOf.getAllOf().get(0).getProperties().containsKey("street"));
       assertTrue(allOf.getAllOf().get(1).getProperties().containsKey("gps"));

       // Testing path item
       ComposedSchema schema = (ComposedSchema) openAPI.getPaths().get("/withInvalidComposedModel").getPost().getRequestBody().getContent().get("application/json").getSchema();
       // In fact the schema resolved previously is the same of /withInvalidComposedModel
       assertEquals(schema, allOf);
       assertEquals(schema.getAllOf().size(), 2);
       assertTrue(schema.getAllOf().get(0).getProperties().containsKey("street"));
       assertTrue(schema.getAllOf().get(1).getProperties().containsKey("gps"));

   }

resolvedCombinator = false - Resolved Yaml

openapi: 3.0.1
info:
title: testing source file
description: This is a sample server Petstore
termsOfService: http://swagger.io/terms/
version: 1.0.0
servers:
- url: http://petstore.swagger.io/api
paths:
/withInvalidComposedModel:
  post:
    operationId: withInvalidComposedModel
    requestBody:
      content:
        application/json:
          schema:
            type: object
            allOf:
            - required:
              - street
              type: object
              properties:
                street:
                  type: string
                  example: 12345 El Monte Road
                city:
                  type: string
                  example: Los Altos Hills
                state:
                  type: string
                  example: CA
                zip:
                  type: string
                  example: "94022"
            - required:
              - gps
              type: object
              properties:
                gps:
                  type: string
      required: false
    responses:
      200:
        description: success!
components:
schemas:
  ExtendedAddress:
    type: object
    allOf:
    - required:
      - street
      type: object
      properties:
        street:
          type: string
          example: 12345 El Monte Road
        city:
          type: string
          example: Los Altos Hills
        state:
          type: string
          example: CA
        zip:
          type: string
          example: "94022"
    - required:
      - gps
      type: object
      properties:
        gps:
          type: string
  Address:
    required:
    - street
    type: object
    properties:
      street:
        type: string
        example: 12345 El Monte Road
      city:
        type: string
        example: Los Altos Hills
      state:
        type: string
        example: CA
      zip:
        type: string
        example: "94022"

Extensions

This project has a core artifact--swagger-parser, which uses Java Service Provider Interface (SPI) so additional extensions can be added.

To build your own extension, you simply need to create a src/main/resources/META-INF/services/io.swagger.v3.parser.core.extensions.SwaggerParserExtension file with the full classname of your implementation. Your class must also implement the io.swagger.v3.parser.core.extensions.SwaggerParserExtension interface. Then, including your library with the swagger-parser module will cause it to be triggered automatically.

Security contact

Please disclose any security-related issues or vulnerabilities by emailing security@swagger.io, instead of using the public issue tracker.