OpenApi 3.1 contentEncoding: base64url not working

[Louisasa]

Q&A (please complete the following information)

• OS: macOS
• Browser: chrome
• Method of installation: npm
• Swagger-UI version: v5.29.5
• Swagger/OpenAPI version: OpenAPI 3.1.0

Content & configuration

Example Swagger/OpenAPI definition:

paths:
  /authorize:
    get:
      summary: Make an authorisation request
      operationId: authorize
      parameters:
        - name: request
          in: query
          required: true
          schema:
            $ref: '#/components/schemas/JWT'

components:
  schemas:
    JWT:
      type: string
      format: jwt
      pattern: '^[A-Za-z0-9_-]+\.[A-Za-z0-9_-]+\.[A-Za-z0-9_-]+$'
      contentEncoding: base64url
      contentSchema:
        type: object
        properties:
          header:
            $ref: '#/components/schemas/JWTHeader'
          payload:
            $ref: '#/components/schemas/JWTPayload'

    JWTHeader:
      type: object
      properties:
        alg:
          type: string
          description: Algorithm used for signing
          example: "HS256"

    JWTPayload:
      type: object
      properties:
        test_id:
          type: string

Describe the bug you're encountering

contentEncoding: base64url causes an issue when I try to expand the parameters of /authorize I've cloned swagger-ui and ran directly from there so I don't believe it's setup.

To reproduce...

Steps to reproduce the behavior: Try to open the parameters and get the following error

TypeError: Unknown encoding: base64url
    at Uint8Array.slowToString (swagger-ui-bundle.js:2:380321)
    at Uint8Array.toString (swagger-ui-bundle.js:2:386727)
    at base64url (swagger-ui-bundle.js:2:1459775)
    at Proxy.types_string (swagger-ui-bundle.js:2:1462383)
    at main_sampleFromSchemaGeneric (swagger-ui-bundle.js:2:1472308)
    at Object.main_sampleFromSchema [as sampleFromSchema] (swagger-ui-bundle.js:2:1472553)
    at Object.memoized [as memoizedSampleFromSchema] (swagger-ui-bundle.js:2:406173)
    at Object.getJsonSampleSchema (swagger-ui-bundle.js:2:1473075)
    at swagger-ui-bundle.js:2:1474279
    at Object.getSampleSchema (swagger-ui-bundle.js:2:1389017)

[KrishCodesw]

Hi, I'm new to this organiztion and would like to try and investigate this bug. I'll see if I can reproduce it locally and will share any findings.

[KrishCodesw]

Hi, can my PR be reviewed please ?

[Louisasa]

Hi, I don't think I'm the right person to review your work. Regardless, I don't think you're doing the right thing as you're converting base64url to base64, instead of supporting base64url?

[MichakrawSB]

Hi @KrishCodesw,

Thanks for your patience! We’re reorganizing some processes and working on major updates (including the new Swagger Editor), so reviews are taking a bit longer than usual. Your PR is in the queue and we’ll get to it as soon as we can.

@Louisasa, if you have time, your review would be really helpful. Final approval will come from our side, but community feedback makes things easier and faster.

Thanks! Swagger Team