From 302da845aff920b49e420f6aa839b3b0ce72c4eb Mon Sep 17 00:00:00 2001
From: SunnyAjin <ajin847@gmail.com>
Date: Wed, 15 Feb 2023 05:56:33 +0000
Subject: [PATCH] chaincode metadata changes added

Signed-off-by: SunnyAjin <ajin847@gmail.com>
---
 app/platform/fabric/Proxy.ts                 | 27 +++++++++++++++++---
 app/platform/fabric/gateway/FabricGateway.ts | 11 ++++++++
 app/rest/platformroutes.ts                   | 16 ++++++++++++
 3 files changed, 51 insertions(+), 3 deletions(-)

diff --git a/app/platform/fabric/Proxy.ts b/app/platform/fabric/Proxy.ts
index 65505a931..7b9a86d60 100644
--- a/app/platform/fabric/Proxy.ts
+++ b/app/platform/fabric/Proxy.ts
@@ -139,11 +139,11 @@ export class Proxy {
 					}
 				}
 				// Sometime 'peers_by_org' property is not included in discover result
-				if(typeof node.ledger_height_low === 'undefined')
+				if (typeof node.ledger_height_low === 'undefined')
 					node.ledger_height_low = '-';
-				if(typeof node.ledger_height_high === 'undefined')
+				if (typeof node.ledger_height_high === 'undefined')
 					node.ledger_height_high = '-';
-				if(typeof node.ledger_height_unsigned === 'undefined')
+				if (typeof node.ledger_height_unsigned === 'undefined')
 					node.ledger_height_unsigned = '-';
 				peers.push(node);
 			} else if (node.peer_type === 'ORDERER') {
@@ -391,4 +391,25 @@ export class Proxy {
 			);
 		}
 	}
+
+	/**
+	 *
+	 * @param {*} contract_name
+	 * @returns
+	 * @memberof Proxy
+	 */
+	async getContractMetadata(network_id, contract_name) {
+		const client = this.platform.getClient(network_id);
+		const channel_name = Object.keys(client.fabricGateway.config.channels)[0];
+		let metadata;
+		try {
+			metadata = await client.fabricGateway.queryContractMetadata(channel_name, contract_name);
+		} catch (e) {
+			logger.debug('getContractMetadata >> ', e);
+		} if (metadata) {
+			return metadata;
+		}
+		logger.error('response_payloads is null');
+		return 'response_payloads is null';
+	}
 }
diff --git a/app/platform/fabric/gateway/FabricGateway.ts b/app/platform/fabric/gateway/FabricGateway.ts
index 49251c0b7..f108280a7 100644
--- a/app/platform/fabric/gateway/FabricGateway.ts
+++ b/app/platform/fabric/gateway/FabricGateway.ts
@@ -488,4 +488,15 @@ export class FabricGateway {
 
 		return null;
 	}
+
+	async queryContractMetadata(channel_name, contract_name) {
+		const network = await this.gateway.getNetwork(channel_name);
+		// Get the contract from the network.        
+		const contract = network.getContract(contract_name);
+		// Get the contract metadata from the network.
+		const result = await contract.evaluateTransaction('org.hyperledger.fabric:GetMetadata');
+		const metadata = JSON.parse(result.toString('utf8'));
+		logger.debug('queryContractMetadata', metadata)
+		return metadata;
+	}
 }
diff --git a/app/rest/platformroutes.ts b/app/rest/platformroutes.ts
index 7bb540f2f..22444bf6b 100644
--- a/app/rest/platformroutes.ts
+++ b/app/rest/platformroutes.ts
@@ -180,4 +180,20 @@ export async function platformroutes(
 			});
 		});
 	});
+
+	/**
+	 * Return channel metadata
+	 * GET /metadata
+	 * curl -i 'http://<host>:<port>/metadata/<chaincode>'
+	 */
+	router.get('/metadata/:chaincode', (req, res) => {
+		const chaincode = req.params.chaincode;
+		if (chaincode) {
+			proxy.getContractMetadata(req.network, chaincode).then((data: any) => {
+				res.send({ status: 200, data: data });
+			});
+		} else {
+			return requtil.invalidRequest(req, res);
+		}
+	});
 } // End platformroutes()