Cannot use 'value' (type []string) as the type string

[ManuelReschke]

Error: Cannot use 'value' (type []string) as the type string

The Problem is that the generated code line:

if value, found := headers[http.CanonicalHeaderKey("Authorization")]; found {

The value is the wrong type.

yml:

/upload:
    post:
      summary: Direct storage upload
      description: >-
        Uploads an image.
      operationId: postDirectUpload
      tags:
        - Upload
      servers:
        - url: http://localhost:8080/api/internal
          description: Internal storage upload server (development)
      security:
        - UploadTokenAuth: []
      parameters:
        - name: Authorization
          in: header
          description: "Bearer <UPLOAD_TOKEN>. Alternative: submit as multipart field 'token'"
          required: false
          schema:
            type: string
      requestBody:
        required: true
        content:
          multipart/form-data:
            schema:
              type: object
              properties:
                file:
                  type: string
                  format: binary
                token:
                  type: string
                  description: "Alternative to Authorization header: pass upload token as multipart field"
              required: [file]
      responses:
        '200':
          description: Upload accepted
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/StorageUploadResponse'
        '400': { $ref: '#/components/responses/BadRequest' }
        '401': { $ref: '#/components/responses/Unauthorized' }
        '413': { $ref: '#/components/responses/PayloadTooLarge' }
        '415': { $ref: '#/components/responses/UnsupportedMediaType' }
        '429': { $ref: '#/components/responses/TooManyRequests' }
        '500': { $ref: '#/components/responses/InternalError' }

Generated Code:

`// PostDirectUpload operation middleware func (siw *ServerInterfaceWrapper) PostDirectUpload(c *fiber.Ctx) error {

var err error

c.Context().SetUserValue(UploadTokenAuthScopes, []string{})

// Parameter object where we will unmarshal all parameters from the context
var params PostDirectUploadParams

headers := c.GetReqHeaders()

// ------------- Optional header parameter "Authorization" -------------
if value, found := headers[http.CanonicalHeaderKey("Authorization")]; found {
	var Authorization string

	err = runtime.BindStyledParameterWithOptions("simple", "Authorization", value, &Authorization, runtime.BindStyledParameterOptions{ParamLocation: runtime.ParamLocationHeader, Explode: false, Required: false})
	if err != nil {
		return fiber.NewError(fiber.StatusBadRequest, fmt.Errorf("Invalid format for parameter Authorization: %w", err).Error())
	}

	params.Authorization = &Authorization

}

return siw.Handler.PostDirectUpload(c, params)

}`

[limkin092]

this is a bug: you can solve in by switching value to value[0]. oapi-codegen’s Fiber template still assumes Ctx.GetReqHeaders() returns a map[string]string, but Fiber changed that method to return map[string][]string. Because of that, the generated code passes a []string to BindStyledParameterWithOptions, and the compiler blows up.

i have the same issue...