[CORD-1796] Generate swagger spec from xproto

Change-Id: Ia5697b386b216d677bef73f08c36c022e28038ca
diff --git a/lib/xos-genx/xosgenx/targets/swagger.xtarget b/lib/xos-genx/xosgenx/targets/swagger.xtarget
new file mode 100644
index 0000000..3d089b9
--- /dev/null
+++ b/lib/xos-genx/xosgenx/targets/swagger.xtarget
@@ -0,0 +1,135 @@
+swagger: "2.0"
+info:
+  title: "XOS REST APIs"
+  description: "XOS - REST API Docs"
+  version: "1.0.0"
+  contact:
+    email: "cord-dev@opencord.org"
+
+{#tags:#}
+{#{%- for object in proto.messages %}#}
+{#- name: "{{ xproto_unquote(xproto_first_non_empty([object.options.app_label, object.options.name])) }}"#}
+{#  description: "{{ xproto_unquote(xproto_first_non_empty([object.options.app_label, object.options.name])) }} Models"#}
+{#  externalDocs:#}
+{#    description: "Find out more"#}
+{#    url: "https://guide.opencord.org/xos/core_models.html"#}
+{#{% endfor %}#}
+
+paths:
+{%- for object in proto.messages %}
+  /xosapi/v1/{{ xproto_unquote(xproto_first_non_empty([object.options.name, object.options.app_label, options.name, context.app_label])) }}/{{ xproto_pluralize(object) | lower }}/:
+    get:
+      tags:
+        - "{{ xproto_unquote(xproto_first_non_empty([object.options.app_label, object.options.name])) }}"
+      summary: "List {{xproto_pluralize(object)}}"
+      responses:
+        200:
+          description: OK
+        401:
+          description: "Unauthorized"
+        403:
+          description: "Forbidden"
+        500:
+          description: "Internal Server Error"
+    post:
+      tags:
+        - "{{ xproto_unquote(xproto_first_non_empty([object.options.app_label, object.options.name])) }}"
+      summary: "Create {{object.name}}"
+      parameters:
+      - in: "body"
+        name: "body"
+        description: "{{object.name}} model properties"
+        required: true
+        schema:
+          $ref: "#/definitions/{{object.name}}"
+      responses:
+        200:
+          description: OK
+        401:
+          description: "Unauthorized"
+        403:
+          description: "Forbidden"
+        500:
+          description: "Internal Server Error"
+  /xosapi/v1/{{ xproto_unquote(xproto_first_non_empty([object.options.name, object.options.app_label, options.name, context.app_label])) }}/{{ xproto_pluralize(object) | lower }}/{id}:
+    get:
+      tags:
+        - "{{ xproto_unquote(xproto_first_non_empty([object.options.app_label, object.options.name])) }}"
+      summary: "Get {{object.name}}"
+      parameters:
+        - in: "path"
+          name: "id"
+          description: "ID of {{ object.name }} to return"
+          required: true
+          type: "integer"
+          format: "int64"
+      responses:
+        200:
+          description: OK
+        401:
+          description: "Unauthorized"
+        403:
+          description: "Forbidden"
+        500:
+          description: "Internal Server Error"
+    put:
+      tags:
+        - "{{ xproto_unquote(xproto_first_non_empty([object.options.app_label, object.options.name])) }}"
+      summary: "Get {{object.name}}"
+      parameters:
+        - in: "path"
+          name: "id"
+          description: "ID of {{ object.name }} to return"
+          required: true
+          type: "integer"
+          format: "int64"
+      responses:
+        200:
+          description: OK
+        401:
+          description: "Unauthorized"
+        403:
+          description: "Forbidden"
+        500:
+          description: "Internal Server Error"
+    delete:
+      tags:
+        - "{{ xproto_unquote(xproto_first_non_empty([object.options.app_label, object.options.name])) }}"
+      summary: "Delete {{object.name}}"
+      parameters:
+        - in: "path"
+          name: "id"
+          description: "ID of {{ object.name }} to return"
+          required: true
+          type: "integer"
+          format: "int64"
+      responses:
+        200:
+          description: OK
+        401:
+          description: "Unauthorized"
+        403:
+          description: "Forbidden"
+        500:
+          description: "Internal Server Error"
+{% endfor %}
+
+definitions:
+{%- for object in proto.messages %}
+    {{ object.name }}:
+      type: "object"
+      properties:
+{%- for f in object.fields %}
+        {{ f.name }}:
+          type: {{ xproto_type_to_swagger_type(f) }}
+{%- if xproto_field_to_swagger_enum(f) %}
+          enum:
+{%- for e in xproto_field_to_swagger_enum(f) %}
+            - {{ e }}
+{%- endfor %}
+{%- endif %}
+{%- if f.options.help_text %}
+          description: "{{ xproto_unquote(f.options.help_text) }}"
+{% endif %}
+{%- endfor %}
+{% endfor %}