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+# BPM Abstraction
+
+| Status        | (Proposed / Accepted / Implemented / Obsolete)       |
+:-------------- |:---------------------------------------------------- |
+| **RFC PR #**     | [NNN](https://github.com/AOT-Technologies/forms-flow-ai/pull/NNN) (update when you have PR #)|
+| **Author(s)** | Sumesh Kariyil (sumesh.pk@aot-technologies.com) |
+
+
+## Objective
+
+Build an abstraction layer between BPM engine and other components
+
+## Motivation
+
+formsflow.ai currently relies on non-BPM features provided by BPM engine to fulfill some requirements.
+
+## Design Proposal
+
+- Come up with an API spec for the BPM ReST layer. [Ref](./bpm_abstraction/bpm_api_spec.yaml)
+- Build an abstraction REST layer on the BPM engine to transform default requests and responses to match with API spec above.
+- Change all components on formsflow.ai to work with a known API spec for BPM engine.
+- Move non BPM features used from BPM engine to formsflow API.
+
+![BPM Integration](./bpm_abstraction/before_after.png "BPM Integration")
+
+
+
+### Alternatives Considered
+
+### Performance Implications
+- Some of the API calls to BPM may need to call Web API
+
+### Dependencies
+
+
+
+### Compatibility (Existing implementation Impact)
+- Need to create migration scripts to move existing metadata in BPM layer to Web API.
+
+## Detailed Design
+
+TBD
+
+## Thanks
+
+Thanks to tensforflow, react RFC templates.
\ No newline at end of file
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+openapi: 3.1.0
+info:
+  title: BPM API Spec
+  version: '1.0'
+  summary: API Specification for the BPM layer
+  description: API Specification for the BPM layer
+  contact:
+    name: AOT Technologies
+    url: 'https://formsflow.ai/'
+    email: info@formsflow.ai
+  license:
+    name: Apache 2.0
+    url: 'https://github.com/AOT-Technologies/forms-flow-ai'
+servers: []
+basePath: /engine-rest-ext/v1/
+paths:
+  '/process-definition/key/{process-key}/start?tenantId={tenantId}':
+    parameters:
+      - schema:
+          type: string
+        name: process-key
+        in: path
+        required: true
+        description: Process Key
+      - schema:
+          type: string
+        name: tenantId
+        in: query
+        description: tenantId for tenant instance
+    post:
+      summary: Start a process instance
+      operationId: post-engine-rest-ext-v1-process-definition-key-process-key-start
+      responses:
+        '200':
+          description: OK
+      description: Start process instance
+      requestBody:
+        content:
+          application/json:
+            schema:
+              type: object
+              properties: {}
+            examples:
+              example-1:
+                value:
+                  firstName: John
+                  lastName: Doe
+                  yearOfBirth: 1980
+                  isActive: true
+        description: ''
+  '/process-definition/key/{process-key}/xml?tenantId={tenantId}':
+    parameters:
+      - schema:
+          type: string
+        name: process-key
+        in: path
+        required: true
+        description: Process Key
+      - schema:
+          type: string
+        name: tenantId
+        in: path
+        required: true
+      - schema:
+          type: string
+        name: tenantId
+        in: query
+        description: tenantId for tenant process
+    get:
+      summary: Get process instance xml
+      operationId: post-engine-rest-ext-v1-process-definition-key-process-key-start
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/ProcessXml'
+              examples: {}
+      description: Get process instance xml
+      requestBody:
+        content:
+          application/json:
+            schema:
+              type: object
+              properties: {}
+            examples:
+              example-1:
+                value:
+                  firstName: John
+                  lastName: Doe
+                  yearOfBirth: 1980
+                  isActive: true
+        description: ''
+  '/process-definition/{id}':
+    parameters:
+      - schema:
+          type: string
+        name: id
+        in: path
+        description: Process definition id
+        required: true
+    get:
+      summary: Get process definition by id
+      tags: []
+      responses:
+        '200':
+          description: User Found
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Process%20Definition'
+              examples: {}
+        '404':
+          description: User Not Found
+      operationId: get-process-definitions
+      description: Retrieve process definition
+  /process-definition:
+    get:
+      summary: List process definitions
+      tags: []
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/Process%20Definition'
+      operationId: get-engine-rest-ext-v1-process-definition
+    parameters: []
+  '/process-instance/{id}/variables':
+    parameters:
+      - schema:
+          type: string
+        name: id
+        in: path
+        required: true
+    get:
+      summary: Get process instance variables
+      tags: []
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                type: object
+                properties: {}
+              examples:
+                example-1:
+                  value:
+                    firstName: John
+                    lastName: Doe
+                    yearOfBirth: 1980
+                    isActive: true
+      operationId: get-process-instance-id
+  '/process-instance/{id}':
+    parameters:
+      - schema:
+          type: string
+        name: id
+        in: path
+        required: true
+    get:
+      summary: Get process instance
+      tags: []
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Process-Instance'
+      operationId: get-process-instance-id
+  '/process-instance/{id}/activity-instances':
+    parameters:
+      - schema:
+          type: string
+        name: id
+        in: path
+        required: true
+    get:
+      summary: TODO - is it needed ? Get activity instances for the diagram
+      tags: []
+      responses: {}
+      operationId: get-process-instance-id-instances
+  /filters/tasks:
+    post:
+      summary: search filtered tasks
+      operationId: search-filters-tasks
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/Task'
+      requestBody:
+        content:
+          application/json:
+            schema:
+              type: object
+              properties: {}
+  /tenant/authorization:
+    parameters: []
+    post:
+      summary: ''
+      operationId: post-tenant-authorization
+      responses:
+        '200':
+          description: OK
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/TenantAuthorization'
+  /deployment/create:
+    post:
+      summary: Create a deployment
+      operationId: post-deployment-create
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Deployment'
+  '/task/{id}/submit':
+    parameters:
+      - schema:
+          type: string
+        name: id
+        in: path
+        required: true
+    post:
+      summary: Submit task
+      operationId: post-task-id-submit
+      responses:
+        '200':
+          description: OK
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/TaskSubmit'
+  '/task/{id}/unclaim':
+    parameters:
+      - schema:
+          type: string
+        name: id
+        in: path
+        required: true
+    post:
+      summary: ''
+      operationId: post-task-id-unclaim
+      responses:
+        '200':
+          description: OK
+  '/task/{id}/claim':
+    parameters:
+      - schema:
+          type: string
+        name: id
+        in: path
+        required: true
+    post:
+      summary: ''
+      operationId: post-task-id-claim
+      responses:
+        '200':
+          description: OK
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/TaskClaim'
+  '/task/{id}':
+    parameters:
+      - schema:
+          type: string
+        name: id
+        in: path
+        required: true
+    get:
+      summary: GET Task by id
+      tags: []
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Task'
+      operationId: get-task-id
+  '/task/{id}/variables':
+    parameters:
+      - schema:
+          type: string
+        name: id
+        in: path
+        required: true
+    get:
+      summary: Your GET endpoint
+      tags: []
+      responses: {}
+      operationId: get-task-id-variables
+  '/task/{id}/identity-links':
+    parameters:
+      - schema:
+          type: string
+        name: id
+        in: path
+        required: true
+    get:
+      summary: Get candidate/identity links for a task
+      tags: []
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                type: array
+                items:
+                  $ref: '#/components/schemas/TaskCandidateLink'
+      operationId: get-task-id-candidate
+    delete:
+      summary: Delete identity link from a task
+      operationId: delete-task-id-identity-links
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/TaskCandidateLink'
+    post:
+      summary: ''
+      operationId: post-task-id-identity-links
+      responses:
+        '200':
+          description: OK
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/TaskCandidateLink'
+  /message:
+    post:
+      summary: Submit a message
+      operationId: post-message
+      responses:
+        '200':
+          description: OK
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/Message'
+components:
+  schemas:
+    Process Definition:
+      title: Process Definition
+      type: object
+      description: ''
+      examples:
+        - id: 142
+          firstName: Alice
+          lastName: Smith
+          email: alice.smith@gmail.com
+          dateOfBirth: '1997-10-31'
+          emailVerified: true
+          signUpDate: '2019-08-24'
+      properties:
+        id:
+          type: string
+          description: Unique identifier for the given user.
+        key:
+          type: string
+        tenantId:
+          type: string
+        name:
+          type: string
+          format: email
+        description:
+          type: string
+        version:
+          type: integer
+          format: date
+          example: '1997-10-31'
+        resourceUri:
+          type: string
+          description: Set to true if the user's email has been verified.
+        deploymentId:
+          type: string
+          format: date
+          description: The date that the user was created.
+        suspended:
+          type: boolean
+      required:
+        - id
+        - key
+        - name
+        - description
+        - resourceUri
+    ProcessXml:
+      title: ProcessXml
+      type: object
+      properties:
+        xml:
+          type: string
+    Process-Instance:
+      title: Process-Instance
+      type: object
+      properties:
+        id:
+          type: string
+        processDefinitionUrl:
+          type: string
+        tenantId:
+          type: string
+    Task:
+      title: Task
+      type: object
+      properties:
+        id:
+          type: string
+        name:
+          type: string
+        assignee:
+          type: string
+        created:
+          type: string
+        due:
+          type: string
+        followUp:
+          type: string
+        description:
+          type: string
+        parentTaskId:
+          type: string
+        priority:
+          type: string
+        processDefinitionId:
+          type: string
+        processInstanceId:
+          type: string
+        taskDefinitionKey:
+          type: string
+        tenantId:
+          type: string
+    TenantAuthorization:
+      title: TenantAuthorization
+      type: object
+      properties:
+        tenantId:
+          type: string
+        adminRoles:
+          type: array
+          items:
+            type: string
+        designerRoles:
+          type: array
+          items:
+            type: string
+        clientRoles:
+          type: array
+          items:
+            type: string
+        reviewerRoles:
+          type: array
+          items:
+            type: string
+    Deployment:
+      title: Deployment
+      type: object
+      properties:
+        deploymentName:
+          type: string
+        deploymentSource:
+          type: string
+        tenantId:
+          type: string
+        enableDuplicateFiltering:
+          type: boolean
+        upload:
+          type: object
+    TaskSubmit:
+      title: TaskSubmit
+      type: object
+      properties:
+        formUrl:
+          type: string
+        applicationId:
+          type: string
+        webFormUrl:
+          type: string
+        action:
+          type: string
+    TaskClaim:
+      title: TaskClaim
+      type: object
+      properties:
+        userId:
+          type: string
+    TaskCandidateLink:
+      title: TaskCandidate
+      type: object
+      properties:
+        groupId:
+          type: string
+        type:
+          type: string
+        userId:
+          type: string
+    Message:
+      title: Message
+      type: object
+      properties:
+        messageName:
+          type: string
+        processInstanceId:
+          type: string
+  securitySchemes:
+    jwt:
+      type: openIdConnect
+      description: ''
+security:
+  - jwt: []