implement render endpoint

Author: frantuma

modules/swagger-codegen/src/main/java/io/swagger/codegen/v3/DefaultGenerator.java

@@ -1,5 +1,8 @@
 package io.swagger.codegen.v3;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.github.jknack.handlebars.Handlebars;
+import com.github.jknack.handlebars.Template;
 import io.swagger.codegen.v3.ignore.CodegenIgnoreProcessor;
 import io.swagger.codegen.v3.templates.TemplateEngine;
 import io.swagger.codegen.v3.utils.ImplementationVersion;
@@ -29,6 +32,8 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.io.PrintWriter;
+import java.io.StringWriter;
 import java.net.URL;
 import java.time.ZonedDateTime;
 import java.util.ArrayList;
@@ -792,12 +797,27 @@ public List<File> generate() {
 
         // supporting files
         Map<String, Object> bundle = buildSupportFileBundle(allOperations, allModels);
-        Json.prettyPrint(bundle);
         generateSupportingFiles(files, bundle);
         config.processOpenAPI(openAPI);
         return files;
     }
 
+    @Override
+    public String renderTemplate(String template, String context) {
+
+        try {
+            Map<String, Object> bundle = new ObjectMapper().readValue(context, Map.class);
+            Handlebars handlebars = new Handlebars();
+            Template hTemplate = handlebars.compileInline(template);
+            return hTemplate.apply(bundle);
+        } catch (IOException e) {
+            StringWriter sw = new StringWriter();
+            PrintWriter pw = new PrintWriter(sw);
+            e.printStackTrace(pw);
+            return "Error rendering template: " + e.getMessage() + "\n" + sw.toString();
+        }
+    }
+
     @Override
     public Map<String, Object> generateBundle() {
 

modules/swagger-codegen/src/main/java/io/swagger/codegen/v3/Generator.java

@@ -9,5 +9,5 @@ public interface Generator {
 
     List<File> generate();
     Map<String, Object> generateBundle();
-
+    String renderTemplate(String template, String context);
 }

modules/swagger-codegen/src/main/java/io/swagger/codegen/v3/service/GeneratorService.java

@@ -60,4 +60,8 @@ public Map<String, Object> generateBundle() {
         throw new RuntimeException("missing opts input");
     }
 
+    public String renderTemplate(RenderRequest renderRequest) {
+        return new DefaultGenerator().renderTemplate(renderRequest.getTemplate(), renderRequest.getContext());
+    }
+
 }

modules/swagger-codegen/src/main/java/io/swagger/codegen/v3/service/RenderRequest.java

@@ -0,0 +1,35 @@
+package io.swagger.codegen.v3.service;
+
+import java.io.Serializable;
+
+public class RenderRequest implements Serializable {
+    private static final long serialVersionUID = 1L;
+
+    private String template;
+    private String context;
+
+    public RenderRequest template(String template) {
+        this.template = template;
+        return this;
+    }
+
+    public String getTemplate() {
+        return template;
+    }
+    public void setTemplate(String template) {
+        this.template = template;
+    }
+
+    public RenderRequest context(String context) {
+        this.context = context;
+        return this;
+    }
+
+    public String getContext() {
+        return context;
+    }
+    public void setContext(String context) {
+        this.context = context;
+    }
+
+}

modules/swagger-codegen/src/main/java/io/swagger/codegen/v3/service/RenderResponse.java

@@ -0,0 +1,22 @@
+package io.swagger.codegen.v3.service;
+
+import java.io.Serializable;
+
+public class RenderResponse implements Serializable {
+    private static final long serialVersionUID = 1L;
+
+    private String value;
+
+    public RenderResponse value(String value) {
+        this.value = value;
+        return this;
+    }
+
+    public String getValue() {
+        return value;
+    }
+    public void setValue(String value) {
+        this.value = value;
+    }
+
+}

modules/swagger-generator/src/main/java/io/swagger/v3/generator/online/GeneratorController.java

@@ -7,6 +7,8 @@
 import io.swagger.codegen.v3.CodegenConfig;
 import io.swagger.codegen.v3.CodegenType;
 import io.swagger.codegen.v3.service.GeneratorService;
+import io.swagger.codegen.v3.service.RenderRequest;
+import io.swagger.codegen.v3.service.RenderResponse;
 import io.swagger.v3.core.util.Yaml;
 import io.swagger.codegen.v3.service.GenerationRequest;
 import io.swagger.v3.generator.model.HiddenOptions;
@@ -484,6 +486,16 @@ public ResponseContext generate(RequestContext context, GenerationRequest genera
 
     }
 
+    public ResponseContext renderTemplate(RequestContext context, RenderRequest renderRequest) {
+        String result = new GeneratorService().renderTemplate(renderRequest);
+        RenderResponse response = new RenderResponse();
+        response.setValue(result);
+        return new ResponseContext()
+                .status(200)
+                .contentType(MediaType.APPLICATION_JSON_TYPE)
+                .entity(response);
+    }
+
     public ResponseContext generateBundle(RequestContext context, GenerationRequest generationRequest) {
 
         String requestLog = requestLog(generationRequest);

modules/swagger-generator/src/main/resources/openapi.yaml

@@ -15,29 +15,6 @@ tags:
 - name: documentation
 - name: config
 paths:
-  "/model":
-    post:
-      tags:
-        - clients
-        - servers
-        - documentation
-        - config
-      x-swagger-router-controller: io.swagger.v3.generator.online.GeneratorController
-      operationId: generateBundle
-      summary: Generates the intermediate model ("bundle") and returns it as a JSON.
-        body.
-      requestBody:
-        content:
-          application/json:
-            schema:
-              "$ref": "#/components/schemas/GenerationRequest"
-      responses:
-        '200':
-          description: successful operation
-          content:
-            application/json:
-              schema:
-                type: object
   "/generate":
     get:
       tags:
@@ -228,6 +205,48 @@ paths:
                 type: "object"
                 additionalProperties:
                   $ref: "#/components/schemas/CliOption"
+  "/model":
+    post:
+      tags:
+        - clients
+        - servers
+        - documentation
+        - config
+      x-swagger-router-controller: io.swagger.v3.generator.online.GeneratorController
+      operationId: generateBundle
+      summary: Generates the intermediate model ("bundle") and returns it as a JSON.
+        body.
+      requestBody:
+        content:
+          application/json:
+            schema:
+              "$ref": "#/components/schemas/GenerationRequest"
+      responses:
+        '200':
+          description: successful operation
+          content:
+            application/json:
+              schema:
+                type: object
+  "/render":
+    post:
+      tags:
+        - documentation
+      x-swagger-router-controller: io.swagger.v3.generator.online.GeneratorController
+      operationId: renderTemplate
+      summary: render a template using the provided data
+      requestBody:
+        content:
+          application/json:
+            schema:
+              "$ref": "#/components/schemas/RenderRequest"
+      responses:
+        '200':
+          description: successful operation
+          content:
+          application/json:
+            schema:
+              "$ref": "#/components/schemas/RenderResponse"
 components:
   parameters:
     version:
@@ -465,3 +484,26 @@ components:
             type: "string"
         default:
           type: "string"
+    RenderRequest:
+      x-swagger-router-model: io.swagger.codegen.v3.service.RenderRequest
+      required:
+        - template
+        - context
+      properties:
+        template:
+          type: string
+          title: template
+          description: template as string
+          example: "{{!mustache}}"
+        context:
+          type: string
+          title: context
+          description: context as string
+          example: "{}"
+    RenderResponse:
+      x-swagger-router-model: io.swagger.codegen.v3.service.RenderResponse
+      required:
+        - value
+      properties:
+        value:
+          type: string