feat(connector-fabric): add GetBlock operation to fabric connectors

- Add common `querySystemChainCode` for executing qscc methods.
- Add new endpoint `GetBlockEndpointV1` and `getBlock` connector method
  for retrieving blocks by number, hash, or txId to the main fabric connector.
- Add similar `getBlock` function to fabric-socketio connector.
- Add functional tests to check new functions in both conenctors.

Closes: #2124

Signed-off-by: Michal Bajer <michal.bajer@fujitsu.com>

packages/cactus-plugin-ledger-connector-fabric-socketio/src/main/typescript/connector/ServerPlugin.ts

@@ -21,12 +21,11 @@ import { ValidatorAuthentication } from "./ValidatorAuthentication";
 // Read the library, SDK, etc. according to EC specifications as needed
 
 import { getClientAndChannel, getSubmitterAndEnroll } from "./fabricaccess";
-import Client, { ProposalRequest } from "fabric-client";
+import Client, { ProposalRequest, Block } from "fabric-client";
 import safeStringify from "fast-safe-stringify";
 
 const path = require("path");
 const { FileSystemWallet, Gateway } = require("fabric-network");
-const fs = require("fs");
 const connUserName = config.read<string>("fabric.connUserName");
 
 // Cryptographic for fabric
@@ -304,6 +303,105 @@ export class ServerPlugin {
         });
     });
   }
+
+  /**
+   * Get fabric block specified in args.
+   *
+   * @param args
+   * ``` javascript
+   * {
+   *     "args": {
+   *         "contract": {"channelName": string}, // Fabric channel to execute the request on
+   *         "args": {
+   *            // OneOf following fields is required. First one found will be used.
+   *            "blockNumber"?: number,
+   *            "blockHash"?: Array<byte>,
+   *            "txId"?: string,
+   *            // Optional. If true, this function returns an encoded block.
+   *            "skipDecode"?: boolean,
+   *          }
+   *     },
+   *     "reqID": string // optional requestID from verifier
+   * }
+   * ```
+   */
+  async getBlock(args: any) {
+    logger.info("getBlock start");
+
+    const channelName = args.contract.channelName;
+    const blockNumber = args.args.blockNumber;
+    const blockHash = args.args.blockHash;
+    const txId = args.args.txId;
+    const skipDecode = args.args.skipDecode ?? false;
+
+    const reqID = args.reqID ?? null;
+    logger.info(`##getBlock: reqID: ${reqID}`);
+
+    let { client, channel } = await getClientAndChannel(channelName);
+    await getSubmitterAndEnroll(client);
+
+    let block: Block;
+    if (typeof blockNumber === "number") {
+      block = await channel.queryBlock(
+        blockNumber,
+        undefined,
+        undefined,
+        skipDecode,
+      );
+    } else if (blockHash) {
+      block = await channel.queryBlockByHash(
+        blockHash,
+        undefined,
+        undefined,
+        skipDecode,
+      );
+    } else if (txId) {
+      block = await channel.queryBlockByTxID(
+        txId,
+        undefined,
+        undefined,
+        skipDecode,
+      );
+    } else {
+      const errObj = {
+        resObj: {
+          status: 400,
+          errorDetail:
+            "getBlock: Provide either blockNumber, blockHash, or txId",
+        },
+        id: reqID,
+      };
+      logger.error(errObj);
+      throw errObj;
+    }
+
+    if (!block) {
+      const errObj = {
+        resObj: {
+          status: 504,
+          errorDetail: "getBlock: Could not retrieve block",
+        },
+        id: reqID,
+      };
+      logger.error(errObj);
+      throw errObj;
+    }
+
+    const signedBlock = ValidatorAuthentication.sign({
+      result: block,
+    });
+
+    const retObj = {
+      resObj: {
+        status: 200,
+        data: signedBlock,
+      },
+      id: reqID,
+    };
+    logger.debug("##getBlock: response:", retObj);
+
+    return retObj;
+  }
 } /* class */
 
 /*

packages/cactus-plugin-ledger-connector-fabric-socketio/src/test/typescript/integration/fabric-socketio-connector.test.ts

@@ -387,6 +387,47 @@ describe("Fabric-SocketIO connector tests", () => {
     expect(readSingleAsset).toEqual(firstAsset);
   });
 
+  /**
+   * Get block by number.
+   */
+  test("Get block by it's number works (both decoded and encoded)", async () => {
+    const contract = { channelName: ledgerChannelName };
+    const method = { type: "function", command: "getBlock" };
+    const argsParam = {
+      blockNumber: 0,
+    };
+
+    // Get decoded block
+    const response = await apiClient.sendSyncRequest(
+      contract,
+      method,
+      argsParam,
+    );
+    expect(response).toBeTruthy();
+    expect(response.status).toEqual(200);
+    expect(response.data).toBeTruthy();
+    expect(response.data.header).toBeTruthy();
+    expect(response.data.data).toBeTruthy();
+    expect(response.data.metadata).toBeTruthy();
+
+    // Get encoded block
+    const argsParamEncoded = {
+      ...argsParam,
+      skipDecode: true,
+    };
+
+    const responseEncoded = await apiClient.sendSyncRequest(
+      contract,
+      method,
+      argsParamEncoded,
+    );
+    expect(responseEncoded).toBeTruthy();
+    expect(responseEncoded.status).toEqual(200);
+    expect(responseEncoded.data).toBeTruthy();
+    expect(responseEncoded.data.type).toEqual("Buffer");
+    expect(responseEncoded.data.data).toBeTruthy();
+  });
+
   /**
    * Send transaction proposal to be signed with keys attached to the request (managed by BLP),
    * and then send signed transaction to the ledger.

packages/cactus-plugin-ledger-connector-fabric/package.json

@@ -72,6 +72,8 @@
     "ngo": "2.7.0",
     "node-ssh": "12.0.0",
     "node-vault": "0.9.22",
+    "fast-safe-stringify": "2.1.1",
+    "sanitize-html": "2.7.0",
     "openapi-types": "9.1.0",
     "prom-client": "13.2.0",
     "sanitize-filename": "1.6.3",
@@ -85,6 +87,7 @@
     "@hyperledger/cactus-plugin-keychain-memory": "1.0.0",
     "@hyperledger/cactus-test-tooling": "1.0.0",
     "@types/express": "4.17.13",
+    "@types/sanitize-html": "2.6.2",
     "@types/fs-extra": "9.0.12",
     "@types/jsrsasign": "8.0.13",
     "@types/multer": "1.4.7",
@@ -110,4 +113,4 @@
       ]
     }
   }
-}
+}