Get file contents

examples/get-file-contents.js

@@ -0,0 +1,112 @@
+import {
+    PrivateKey,
+    FileContentsQuery,
+    Hbar,
+    FileCreateTransaction,
+    FileDeleteTransaction,
+    Client,
+    AccountId,
+} from "@hashgraph/sdk";
+import dotenv from "dotenv";
+
+dotenv.config();
+
+/**
+ * How to get file contents
+ *
+ */
+
+async function main() {
+    /**
+     * Step 0:
+     * Create and configure the SDK Client
+     */
+    if (
+        process.env.OPERATOR_ID == null ||
+        process.env.OPERATOR_KEY == null ||
+        process.env.HEDERA_NETWORK == null
+    ) {
+        throw new Error(
+            "Environment variables OPERATOR_ID, HEDERA_NETWORK, and OPERATOR_KEY are required.",
+        );
+    }
+
+    const operatorId = AccountId.fromString(process.env.OPERATOR_ID);
+    const operatorKey = PrivateKey.fromStringED25519(process.env.OPERATOR_KEY);
+
+    // Create a client for the local Hedera network
+    const client = Client.forNetwork({
+        [process.env.HEDERA_NETWORK]: new AccountId(3),
+    });
+    client.setOperator(operatorId, operatorKey);
+
+    // Increase the timeout settings
+    client.setRequestTimeout(120000);
+
+    /**
+     * Step 1: Submit the file create transaction
+     */
+
+    // Content to be stored in the file.
+    const fileContents = Buffer.from("Hedera is great!", "utf-8");
+
+    try {
+        console.log("Creating new file...");
+
+        // Create the transaction
+        let transaction = new FileCreateTransaction()
+            .setKeys([operatorKey.publicKey]) // The public key of the owner of the file.
+            .setContents(fileContents)
+            .setMaxTransactionFee(new Hbar(2)) // Change the default max transaction fee to 2 hbars
+            .freezeWith(client); // Freeze with client
+
+        transaction = await transaction.sign(operatorKey);
+
+        const response = await transaction.execute(client);
+
+        const receipt = await response.getReceipt(client);
+
+        // Get the file ID
+        const newFileId = receipt.fileId;
+
+        if (newFileId) {
+            console.log(`Created new file with ID: ${newFileId.toString()}`);
+        } else {
+            throw new Error("Failed to retrieve new file ID");
+        }
+
+        /**
+         * Step 2: Get file contents and print them
+         */
+
+        const fileContentsQuery = await new FileContentsQuery()
+            .setFileId(newFileId)
+            .execute(client);
+
+        if (fileContentsQuery) {
+            console.log("File contents: " + fileContentsQuery.toString());
+        } else {
+            throw new Error("Failed to retrieve file contents");
+        }
+
+        // Clean up: Delete created file
+        const fileDeleteTxResponse = await new FileDeleteTransaction()
+            .setFileId(newFileId)
+            .execute(client);
+
+        await fileDeleteTxResponse.getReceipt(client);
+
+        console.log("File deleted successfully");
+    } catch (error) {
+        console.error("Error occurred during file creation:", error);
+    } finally {
+        // Close the client
+        client.close();
+        console.log("Get File Contents Example Complete!");
+    }
+}
+
+main().catch((error) => {
+    console.error("Unhandled error:", error);
+    process.exit(1);
+});