Allow runtime-expressions for formatted strings

examples/star-wars-homeworld.yaml

@@ -0,0 +1,33 @@
+# yaml-language-server: $schema=https://serverlessworkflow.io/schemas/1.0.0-alpha2/workflow.yaml
+document:
+  dsl: 1.0.0-alpha2
+  namespace: examples
+  name: star-wars-homeplanet
+  version: 1.0.0-alpha2
+input:
+  schema:
+    format: json
+    document:
+      type: object
+      required:
+        - id
+      properties:
+        id:
+          type: integer
+          description: The id of the star wars character to get
+          minimum: 1
+do:
+  - getStarWarsCharacter:
+      call: http
+      with:
+        method: get
+        endpoint: https://swapi.dev/api/people/{id}
+        output: response
+      export:
+        as:
+          homeworld: ${ .content.homeworld }
+  - getStarWarsHomeworld:
+      call: http
+      with:
+        method: get
+        endpoint: ${ $context.homeworld }

schema/workflow.yaml

@@ -2,6 +2,7 @@ $id: https://serverlessworkflow.io/schemas/1.0.0-alpha1/workflow.yaml
 $schema: https://json-schema.org/draft/2020-12/schema
 description: Serverless Workflow DSL - Workflow Schema
 type: object
+required: [ document, do ]
 properties:
   document:
     type: object
@@ -252,7 +253,9 @@ $defs:
                 description: The HTTP endpoint to send the request to.
                 oneOf:
                   - $ref: '#/$defs/endpoint'
-                  - type: string
+                  - $ref: '#/$defs/runtimeExpression'
+                  - title: LiteralEndpoint
+                    type: string
                     format: uri-template
               headers:
                 type: object
@@ -360,23 +363,32 @@ $defs:
                 type: string
                 description: The event's unique identifier
               source:
-                type: string
-                format: uri
                 description: Identifies the context in which an event happened
+                oneOf:
+                  - title: LiteralSource
+                    type: string
+                    format: uri-template
+                  - $ref: '#/$defs/runtimeExpression'
               type:
                 type: string
                 description: This attribute contains a value describing the type of event related to the originating occurrence.
               time:
-                type: string
-                format: date-time
+                oneOf:
+                  - title: LiteralTime
+                    type: string
+                    format: date-time
+                  - $ref: '#/$defs/runtimeExpression'
               subject:
                 type: string
               datacontenttype:
                 type: string
                 description: Content type of data value. This attribute enables data to carry any type of content, whereby format and encoding might differ from that of the chosen event format.
               dataschema:
-                type: string
-                format: uri
+                oneOf:
+                  - title: LiteralDataSchema
+                    type: string
+                    format: uri-template
+                  - $ref: '#/$defs/runtimeExpression'
             required: [ source, type ]
             additionalProperties: true
         required: [ event ]
@@ -772,16 +784,22 @@ $defs:
     type: object
     properties:
       type:
-        type: string
-        format: uri
         description: A URI reference that identifies the error type.
+        oneOf:
+          - title: LiteralErrorType
+            type: string
+            format: uri-template
+          - $ref: '#/$defs/runtimeExpression'
       status:
         type: integer
         description: The status code generated by the origin for this occurrence of the error.
       instance:
-        type: string
-        format: json-pointer
         description: A JSON Pointer used to reference the component the error originates from.
+        oneOf:
+          - title: LiteralErrorInstance
+            type: string
+            format: json-pointer
+          - $ref: '#/$defs/runtimeExpression'
       title:
         type: string
         description: A short, human-readable summary of the error.
@@ -793,9 +811,12 @@ $defs:
     type: object
     properties:
       uri:
-        type: string
-        format: uri-template
         description: The endpoint's URI.
+        oneOf:
+          - title: LiteralEndpointURI
+            type: string
+            format: uri-template
+          - $ref: '#/$defs/runtimeExpression'
       authentication:
         $ref: '#/$defs/referenceableAuthenticationPolicy'
         description: The authentication policy to use.
@@ -1030,4 +1051,8 @@ $defs:
         description: The duration after which to timeout.
     required: [ after ]
     description: The definition of a timeout.
-required: [ document, do ]
+  runtimeExpression:
+    title: RuntimeExpression
+    type: string
+    description: A runtime expression
+    pattern: "^\\s*\\$\\{.+\\}\\s*$"