Add getBlobs endpoint (#546)

Author: nflaig

CHANGES.md

@@ -11,6 +11,7 @@ There are likely to be descriptions etc outside of the list below, but new query
 | [#535](https://github.com/ethereum/beacon-APIs/pull/535) `data_column_sidecar EVENT` added        |                                                  |                                                  |                                                    |                                                 |                                           |
 | [#537](https://github.com/ethereum/beacon-APIs/pull/537) `GET /eth/v1/debug/beacon/data_column_sidecars/{block_id}` added         |                                                  |                                                  |                                                    |                                                 |                                           |
 | [#539](https://github.com/ethereum/beacon-APIs/pull/539) `GET /eth/v1/beacon/states/{state_id}/proposer_lookahead` added         |                                                  |                                                  |                                                    |                                                 |                                           |
+| [#546](https://github.com/ethereum/beacon-APIs/pull/546) `GET /eth/v1/beacon/blobs/{block_id}` added         |                                                  |                                                  |                                                    |                                                 |                                           |
 
 The Following are no longer in the Standard API, removed since the latest version.
 

apis/beacon/blob_sidecars/blob_sidecars.yaml

@@ -1,6 +1,7 @@
 get:
   operationId: getBlobSidecars
   summary: Get blob sidecars  
+  deprecated: true
   description: |
     Retrieves blob sidecars for a given block id.
     Depending on `Accept` header it can be returned either as json or as bytes serialized by SSZ.

apis/beacon/blobs/blobs.yaml

@@ -0,0 +1,69 @@
+get:
+  operationId: getBlobs
+  summary: Get blobs
+  description: |
+    Retrieves blobs for a given block id.
+    Depending on `Accept` header it can be returned either as json or as bytes serialized by SSZ.
+
+    If the `versioned_hashes` parameter is specified, only the blobs for the specified versioned hashes will be returned. Blobs are 
+    returned as an ordered list matching the order of their corresponding KZG commitments in the block.
+
+    After the Fulu fork, only supernodes (which custody all data columns) are required to return blobs. Clients may implement
+    blob reconstruction logic for non-super nodes.
+  tags:
+    - Beacon
+  parameters:
+    - name: block_id
+      in: path
+      required: true
+      $ref: "../../../beacon-node-oapi.yaml#/components/parameters/BlockId"
+    - name: versioned_hashes
+      in: query
+      description: Array of versioned hashes for blobs to request for in the specified block. Returns all blobs in the block if not specified.
+      required: false
+      schema:
+        type: array
+        uniqueItems: true
+        items:
+          $ref: "../../../beacon-node-oapi.yaml#/components/schemas/VersionedHash"
+  responses:
+    "200":
+      description: "Successful response"
+      content:
+        application/json:
+          schema:
+            title: GetBlobsResponse
+            type: object
+            required: [execution_optimistic, finalized, data]
+            properties:
+              execution_optimistic:
+                $ref: "../../../beacon-node-oapi.yaml#/components/schemas/ExecutionOptimistic"
+              finalized:
+                $ref: "../../../beacon-node-oapi.yaml#/components/schemas/Finalized"
+              data:
+                $ref: "../../../beacon-node-oapi.yaml#/components/schemas/Blobs"
+        application/octet-stream:
+          schema:
+            description: "SSZ serialized `List[Blob, MAX_BLOB_COMMITMENTS_PER_BLOCK]` bytes. Use Accept header to choose this response type"
+    "400":
+      description: "The block ID supplied could not be parsed"
+      content:
+        application/json:
+          schema:
+            $ref: "../../../beacon-node-oapi.yaml#/components/schemas/ErrorMessage"
+          example:
+            code: 400
+            message: "Invalid block ID: current"
+    "404":
+      description: "Block not found"
+      content:
+        application/json:
+          schema:
+            $ref: "../../../beacon-node-oapi.yaml#/components/schemas/ErrorMessage"
+          example:
+            code: 404
+            message: "Block not found"
+    "406":
+      $ref: "../../../beacon-node-oapi.yaml#/components/responses/NotAcceptable"
+    "500":
+      $ref: "../../../beacon-node-oapi.yaml#/components/responses/InternalError"

beacon-node-oapi.yaml

@@ -112,6 +112,8 @@ paths:
     $ref: "./apis/beacon/blocks/attestations.v2.yaml"
   /eth/v1/beacon/blob_sidecars/{block_id}:
     $ref: "./apis/beacon/blob_sidecars/blob_sidecars.yaml"
+  /eth/v1/beacon/blobs/{block_id}:
+    $ref: "./apis/beacon/blobs/blobs.yaml"
   /eth/v1/debug/beacon/data_column_sidecars/{block_id}:
     $ref: "./apis/debug/data_column_sidecars.yaml"
   /eth/v1/beacon/rewards/sync_committee/{block_id}:
@@ -381,6 +383,10 @@ components:
       $ref: './types/deneb/light_client.yaml#/Deneb/LightClientOptimisticUpdate'
     Blob:
       $ref: './types/primitive.yaml#/Blob'
+    Blobs:
+      $ref: './types/deneb/block_contents.yaml#/Deneb/Blobs'
+    VersionedHash:
+      $ref: './types/primitive.yaml#/VersionedHash'
     Deneb.BlobSidecars:
       $ref: './types/deneb/blob_sidecar.yaml#/Deneb/BlobSidecars'
     Electra.BeaconState:

types/primitive.yaml

@@ -141,3 +141,10 @@ KZGProof:
   format: hex
   pattern: "^0x[a-fA-F0-9]{96}$"
   description: "A G1 curve point. Used for verifying that the `KZGCommitment` for a given `Blob` is correct."
+
+VersionedHash:
+  type: string
+  format: hex
+  pattern: "^0x[a-fA-F0-9]{64}$"
+  description: "A versioned hash used to identify a Blob."
+  example: "0x01cf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"