Transform a Salesforce WSDL into an OpenAPI 2.0 Swagger YAML file

WSDL2Swagger.xslt

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
    xmlns:w="http://schemas.xmlsoap.org/wsdl/"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:tns="urn:enterprise.soap.sforce.com"
    xmlns:fns="urn:fault.enterprise.soap.sforce.com"
    xmlns:ens="urn:sobject.enterprise.soap.sforce.com"
    exclude-result-prefixes="xs"
    version="2.0">

    <xsl:output method="text" encoding="UTF-8" indent="no" media-type="text/yaml"/>
    <xsl:variable name="space2" select="'  '"/>
    <xsl:variable name="space4" select="'    '"/>
    <xsl:variable name="space6" select="'      '"/>
    <xsl:template match="/">
swagger: "2.0"
info:
  description: "Sample implementation of a Salesfore SWAGGER File"
  version: "1.0.0"
  title: "Salesforce Rest API"
  contact:
    email: "swissel@salesforce.com"
  license:
    name: "Apache 2.0"
    url: "http://www.apache.org/licenses/LICENSE-2.0.html"
host: "login.salesforce.com"
basePath: "/services/data/v45.0"
schemes:
- "https"
paths:
<xsl:apply-templates select="/w:definitions/w:types/xsd:schema[@targetNamespace='urn:sobject.enterprise.soap.sforce.com']" mode="path"/>
definitions:
<xsl:apply-templates select="/w:definitions/w:types/xsd:schema"/>
# EOF        
</xsl:template>
    
    <xsl:template match="xsd:schema" >  
<xsl:apply-templates select="xsd:complexType" />
    </xsl:template>
    
<xsl:template match="xsd:complexType">
<xsl:value-of select="$space2"/><xsl:value-of select="@name"/>:
    type: "object"
<xsl:if test="count(descendant::xsd:element) > 0">    properties:
<xsl:apply-templates select="descendant::xsd:element" />
</xsl:if>
<xsl:if test="count(descendant::xsd:element) = 0">    properties: {}
</xsl:if>
</xsl:template>
  
<xsl:template match="xsd:element">
<xsl:value-of select="$space6"/><xsl:value-of select="@name"/>:
        $ref: "#/definitions/<xsl:value-of select="replace(replace(@type,'tns:',''),'ens:','')"/>"
</xsl:template>

<xsl:template match="xsd:element[@type='xsd:anyType']">
    <xsl:value-of select="$space6"/><xsl:value-of select="@name"/>:
        type: "object"
        properties: {}
</xsl:template>

<xsl:template match="xsd:element[@type='xsd:boolean']">
<xsl:value-of select="$space6"/><xsl:value-of select="@name"/>:
        type: "boolean"
</xsl:template>
  
<xsl:template match="xsd:element[@type='xsd:string']">
<xsl:value-of select="$space6"/><xsl:value-of select="@name"/>:
        type: "string"
</xsl:template>
  
<xsl:template match="xsd:element[@type='xsd:double']">
<xsl:value-of select="$space6"/><xsl:value-of select="@name"/>:
        type: "number"
        format: "double"
</xsl:template>

 <xsl:template match="xsd:element[@type='xsd:int']">
 <xsl:value-of select="$space6"/><xsl:value-of select="@name"/>:
        type: "integer"
        format: "int32"
</xsl:template>

<xsl:template match="xsd:element[@type='xsd:dateTime']">
<xsl:value-of select="$space6"/><xsl:value-of select="@name"/>:
        type: "string"
        format: "date-time"
</xsl:template>
  
<xsl:template match="xsd:element[@type='xsd:date']">
<xsl:value-of select="$space6"/><xsl:value-of select="@name"/>:
        type: "string"
        format: "date"
</xsl:template>  
  
<xsl:template match="xsd:element[@type='tns:ID']">
<xsl:value-of select="$space6"/><xsl:value-of select="@name"/>:
        type: "string"
</xsl:template>

<xsl:template match="xsd:element[@type='ens:User']">
<xsl:value-of select="$space6"/><xsl:value-of select="@name"/>:
        type: "string"
</xsl:template>
  
<xsl:template match="xsd:element" mode="required">
<xsl:value-of select="$space4"/>-<xsl:value-of select="@name"/>  
</xsl:template>  
    
<!-- Definition for a PATH -->
    <xsl:template match="xsd:schema" mode="path" >  
        <xsl:apply-templates select="xsd:complexType" mode="path"/>
    </xsl:template>    
<xsl:template match="xsd:complexType" mode="path">
<xsl:value-of select="$space2"/>/services/data/v45.0/sobjects/<xsl:value-of select="@name"/>:
    post:
      consumes:
      - "application/json"
      produces:
      - "application/json"
      parameters:
      - in: "body"
        name: "body"
        required: true
        schema:
          $ref: "#/definitions/<xsl:value-of select="@name"/>"
      responses:
        405:
          description: "Invalid input"
        200:
          description: "Success"
<xsl:value-of select="$space2"/>/services/data/v45.0/sobjects/<xsl:value-of select="@name"/>/{Id}:
    get:
      summary: "Find <xsl:value-of select="@name"/> by ID"
      description: "Returns a single <xsl:value-of select="@name"/>"
      produces:
      - "application/json"
      parameters:
      - name: "Id"
        in: "path"
        description: "ID of <xsl:value-of select="@name"/> to return"
        required: true
        type: "string"
      responses:
        200:
          description: "successful operation"
          schema:
            $ref: "#/definitions/<xsl:value-of select="@name"/>"
        400:
          description: "Invalid ID supplied"
        404:
          description: "<xsl:value-of select="@name"/> not found"           
    put:
      summary: "Update <xsl:value-of select="@name"/>"
      consumes:
      - "application/json"
      produces:
      - "application/json"
      parameters:
      - in: "body"
        name: "body"
        required: true
        schema:
          $ref: "#/definitions/<xsl:value-of select="@name"/>"
      responses:
        400:
          description: "Invalid operation"
        200:
          description: "Success"    
</xsl:template>    
    <!-- Catch call to not render what we don't like -->
    <xsl:template match="*" />
  
  <!-- 
    Unused stuff
    
    <xsl:if test="count(descendant::xsd:element[nillable='false']) > 0">
    required:
    <xsl:apply-templates select="descendant::xsd:element[nillable='false']" mode="required"/>
</xsl:if>

-->
</xsl:stylesheet>