Created
January 30, 2018 20:01
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var iotHubName = pm.environment.get("iotHubName"); | |
var iotHubKey = pm.environment.get("iotHubKey"); | |
var iotHubTokenExpiration = pm.environment.get("iotHubTokenExpiration"); | |
var iotHubPolicyName = pm.environment.get("iotHubPolicyName"); | |
pm.globals.clear("iotHubSasToken"); // clear out token on first run. | |
// See this doc for details: https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-security | |
var resourceUri = encodeURIComponent(iotHubName + '.azure-devices.net'); // The resource uri | |
var expiry = Math.ceil((Date.now() / 1000) + iotHubTokenExpiration * 60); // Expire the token 60 minutes from now | |
var uriExpiry = resourceUri + '\n' + expiry; // this is the string format to gen signature from | |
var decodedKey = CryptoJS.enc.Base64.parse(iotHubKey); // The SHA256 key is the Base64 decoded version of the IoT Hub key | |
var signature = CryptoJS.HmacSHA256(uriExpiry, decodedKey); // The signature generated from the decodedKey | |
var encodedUri = encodeURIComponent(CryptoJS.enc.Base64.stringify(signature)); // The url encoded version of the Base64 signature | |
// Construct authorization string (shared access signature) | |
var iotHubSasToken = "SharedAccessSignature sr=" + resourceUri + "&sig=" + encodedUri + "&se=" + expiry; | |
// Add token if one is present | |
if (iotHubPolicyName) { | |
iotHubSasToken += "&skn="+ iotHubPolicyName; | |
} | |
// Put in variable to be used in other requests. | |
pm.globals.set("iotHubSasToken", iotHubSasToken); | |
console.log("Shared Access Signature:" + pm.globals.get("iotHubSasToken")); |
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