Literal Rewrite Flag

.gitignore

@@ -2,3 +2,4 @@
 kusk
 site/
 dist/
+.vscode

generators/ambassador/ambassador.go

@@ -40,6 +40,12 @@ func (*AbstractGenerator) Flags() *pflag.FlagSet {
 		"a prefix to trim from the URL before forwarding to the upstream Service",
 	)
 
+	fs.String(
+		"path.rewrite",
+		"",
+		"rewrite your base path before forwarding to the upstream service",
+	)
+
 	fs.Bool(
 		"path.split",
 		false,
@@ -91,10 +97,7 @@ func (a *AbstractGenerator) Generate(opts *options.Options, spec *openapi3.T) (s
 
 	if shouldSplit(opts, spec) {
 		// generate a mapping for each operation
-		basePath := opts.Path.Base
-		if basePath == "/" {
-			basePath = ""
-		}
+		basePath := strings.TrimSuffix(opts.Path.Base, "/")
 
 		host := opts.Host
 
@@ -118,12 +121,18 @@ func (a *AbstractGenerator) Generate(opts *options.Options, spec *openapi3.T) (s
 				mappingPath, regex := generateMappingPath(path, operation)
 				mappingName := generateMappingName(opts.Service.Name, method, path, operation)
 
+				var pathRewrite string
+				if opts.Path.RewriteBase != "" {
+					pathRewrite = strings.TrimSuffix(opts.Path.RewriteBase, "/") + mappingPath
+				}
+
 				op := mappingTemplateData{
 					MappingName:      mappingName,
 					MappingNamespace: opts.Namespace,
 					ServiceURL:       serviceURL,
 					BasePath:         basePath,
 					TrimPrefix:       opts.Path.TrimPrefix,
+					PathRewrite:      pathRewrite,
 					Method:           method,
 					Path:             mappingPath,
 					Regex:            regex,
@@ -211,6 +220,7 @@ func (a *AbstractGenerator) Generate(opts *options.Options, spec *openapi3.T) (s
 			ServiceURL:       serviceURL,
 			BasePath:         opts.Path.Base,
 			TrimPrefix:       opts.Path.TrimPrefix,
+			PathRewrite:      strings.TrimSuffix(opts.Path.RewriteBase, "/"),
 			RequestTimeout:   opts.Timeouts.RequestTimeout * 1000,
 			IdleTimeout:      opts.Timeouts.IdleTimeout * 1000,
 			Host:             opts.Host,
@@ -296,6 +306,7 @@ func (a *AbstractGenerator) Generate(opts *options.Options, spec *openapi3.T) (s
 // and whether the regex should be used
 func generateMappingPath(path string, op *openapi3.Operation) (string, bool) {
 	containsPathParameter := false
+
 	for _, param := range op.Parameters {
 		if param.Value.In == "path" {
 			containsPathParameter = true

generators/ambassador/mapping_template.go

@@ -6,8 +6,9 @@ type mappingTemplateData struct {
 	MappingNamespace string
 	ServiceURL       string
 
-	BasePath   string
-	TrimPrefix string
+	BasePath    string
+	TrimPrefix  string
+	PathRewrite string
 
 	Method  string
 	Path    string

generators/ambassador/v1/ambassador_test.go

@@ -1725,6 +1725,151 @@ spec:
   method: POST
   service: petstore.default:80
   rewrite: ""
+`,
+		},
+		{
+			name: "rewrite literal specified at global level",
+			spec: `
+openapi: 3.0.1
+x-kusk:
+  namespace: booksapp
+  host: "*"
+  path:
+    base: /my-bookstore
+    rewrite_base: /bookstore/
+  service:
+    name: webapp
+    namespace: booksapp
+    port: 7000
+paths:
+  /:
+    get: {}
+
+  /books:
+    post: {}
+
+  /books/{id}:
+    get: {}
+`,
+			options: options.Options{
+				Namespace: "booksapp",
+				Host:      "*",
+				Path: options.PathOptions{
+					Base:        "/my-bookstore",
+					RewriteBase: "/bookstore/",
+				},
+				Service: options.ServiceOptions{
+					Namespace: "booksapp",
+					Name:      "webapp",
+					Port:      7000,
+				},
+			},
+			res: `
+---
+apiVersion: getambassador.io/v2
+kind: Mapping
+metadata:
+  name: webapp
+  namespace: booksapp
+spec:
+  prefix: "/my-bookstore"
+  host: *
+  service: webapp.booksapp:7000
+  rewrite: "/bookstore"
+`,
+		},
+		{
+			name: "rewrite literal specified at global level with path split",
+			spec: `
+openapi: 3.0.1
+x-kusk:
+  namespace: booksapp
+  host: "*"
+  path:
+    base: /my-bookstore/
+    rewrite_base: /bookstore/
+  service:
+    name: webapp
+    namespace: booksapp
+    port: 7000
+paths:
+  /:
+    get: {}
+
+  /books:
+    post: {}
+
+  /books/{id}:
+    get:
+      parameters:
+        - name: id
+          in: path
+          required: true
+          schema:
+            type: integer
+            format: int64
+
+  /disabled-path:
+    x-kusk:
+      disabled: true
+  get: {}
+`,
+			options: options.Options{
+				Namespace: "booksapp",
+				Host:      "*",
+				Path: options.PathOptions{
+					Base:        "/my-bookstore/",
+					RewriteBase: "/bookstore/",
+				},
+				Service: options.ServiceOptions{
+					Namespace: "booksapp",
+					Name:      "webapp",
+					Port:      7000,
+				},
+				PathSubOptions: map[string]options.SubOptions{
+					"/disabled-path": {
+						Disabled: &trueValue,
+					},
+				},
+			},
+			res: `
+---
+apiVersion: getambassador.io/v2
+kind: Mapping
+metadata:
+  name: webapp-get
+  namespace: booksapp
+spec:
+  prefix: "/my-bookstore/"
+  host: *
+  method: GET
+  service: webapp.booksapp:7000
+  rewrite: "/bookstore/"
+---
+apiVersion: getambassador.io/v2
+kind: Mapping
+metadata:
+  name: webapp-getbooksid
+  namespace: booksapp
+spec:
+  prefix: "/my-bookstore/books/([a-zA-Z0-9]*)"
+  prefix_regex: true
+  host: *
+  method: GET
+  service: webapp.booksapp:7000
+  rewrite: "/bookstore/books/([a-zA-Z0-9]*)"
+---
+apiVersion: getambassador.io/v2
+kind: Mapping
+metadata:
+  name: webapp-postbooks
+  namespace: booksapp
+spec:
+  prefix: "/my-bookstore/books"
+  host: *
+  method: POST
+  service: webapp.booksapp:7000
+  rewrite: "/bookstore/books"
 `,
 		},
 	}

generators/ambassador/v1/mapping_template.go

@@ -28,6 +28,8 @@ spec:
   regex_rewrite:
     pattern: '{{.TrimPrefix}}(.*)'
     substitution: '\1'
+  {{else if .PathRewrite}}
+  rewrite: "{{.PathRewrite}}"
   {{else}}
   rewrite: ""
   {{end}}

generators/ambassador/v2/ambassador_test.go

@@ -1807,6 +1807,151 @@ spec:
   method: POST
   service: petstore.default:80
   rewrite: ""
+`,
+		},
+		{
+			name: "rewrite literal specified at global level",
+			spec: `
+openapi: 3.0.1
+x-kusk:
+  namespace: booksapp
+  host: "*"
+  path:
+    base: /my-bookstore
+    rewrite_base: /bookstore/
+  service:
+    name: webapp
+    namespace: booksapp
+    port: 7000
+paths:
+  /:
+    get: {}
+
+  /books:
+    post: {}
+
+  /books/{id}:
+    get: {}
+`,
+			options: options.Options{
+				Namespace: "booksapp",
+				Host:      "*",
+				Path: options.PathOptions{
+					Base:        "/my-bookstore",
+					RewriteBase: "/bookstore/",
+				},
+				Service: options.ServiceOptions{
+					Namespace: "booksapp",
+					Name:      "webapp",
+					Port:      7000,
+				},
+			},
+			res: `
+---
+apiVersion: getambassador.io/v3alpha1
+kind: Mapping
+metadata:
+  name: webapp
+  namespace: booksapp
+spec:
+  prefix: "/my-bookstore"
+  hostname: '*'
+  service: webapp.booksapp:7000
+  rewrite: "/bookstore"
+`,
+		},
+		{
+			name: "rewrite literal specified at global level with path split",
+			spec: `
+openapi: 3.0.1
+x-kusk:
+  namespace: booksapp
+  host: "*"
+  path:
+    base: /my-bookstore/
+    rewrite_base: /bookstore/
+  service:
+    name: webapp
+    namespace: booksapp
+    port: 7000
+paths:
+  /:
+    get: {}
+
+  /books:
+    post: {}
+
+  /books/{id}:
+    get:
+      parameters:
+        - name: id
+          in: path
+          required: true
+          schema:
+            type: integer
+            format: int64
+
+  /disabled-path:
+    x-kusk:
+      disabled: true
+  get: {}
+`,
+			options: options.Options{
+				Namespace: "booksapp",
+				Host:      "*",
+				Path: options.PathOptions{
+					Base:        "/my-bookstore/",
+					RewriteBase: "/bookstore/",
+				},
+				Service: options.ServiceOptions{
+					Namespace: "booksapp",
+					Name:      "webapp",
+					Port:      7000,
+				},
+				PathSubOptions: map[string]options.SubOptions{
+					"/disabled-path": {
+						Disabled: &trueValue,
+					},
+				},
+			},
+			res: `
+---
+apiVersion: getambassador.io/v3alpha1
+kind: Mapping
+metadata:
+  name: webapp-get
+  namespace: booksapp
+spec:
+  prefix: "/my-bookstore/"
+  hostname: '*'
+  method: GET
+  service: webapp.booksapp:7000
+  rewrite: "/bookstore/"
+---
+apiVersion: getambassador.io/v3alpha1
+kind: Mapping
+metadata:
+  name: webapp-getbooksid
+  namespace: booksapp
+spec:
+  prefix: "/my-bookstore/books/([a-zA-Z0-9]*)"
+  prefix_regex: true
+  hostname: '*'
+  method: GET
+  service: webapp.booksapp:7000
+  rewrite: "/bookstore/books/([a-zA-Z0-9]*)"
+---
+apiVersion: getambassador.io/v3alpha1
+kind: Mapping
+metadata:
+  name: webapp-postbooks
+  namespace: booksapp
+spec:
+  prefix: "/my-bookstore/books"
+  hostname: '*'
+  method: POST
+  service: webapp.booksapp:7000
+  rewrite: "/bookstore/books"
 `,
 		},
 	}

generators/ambassador/v2/mapping_template.go

@@ -28,6 +28,8 @@ spec:
   regex_rewrite:
     pattern: '{{.TrimPrefix}}(.*)'
     substitution: '\1'
+  {{else if .PathRewrite}}
+  rewrite: "{{.PathRewrite}}"
   {{else}}
   rewrite: ""
   {{end}}