update to 0.0.4 includes SHA1 hash instead of old 10digit hash
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@ -17,7 +17,7 @@ The `usermod_v2_HttpPullLightControl` is a custom user module for WLED that enab
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* Specify the URL endpoint and polling interval.
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## JSON Format and examples
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* The module sends a GET request to the configured URL, appending a unique identifier as a query parameter: `https://www.example.com/mycustompage.php?id=xxxxxxxx` where xxxxxxx is a hash of the MAC address combined with a given salt.
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* The module sends a GET request to the configured URL, appending a unique identifier as a query parameter: `https://www.example.com/mycustompage.php?id=xxxxxxxx` where xxxxxxx is a 40 character long SHA1 hash of the MAC address combined with a given salt.
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* Response Format (since v0.0.3) it is eactly the same as the WLED JSON API, see: https://kno.wled.ge/interfaces/json-api/
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After getting the URL (it can be a static file like static.json or a mylogic.php which gives a dynamic response), the response is read and parsed to WLED.
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@ -24,6 +24,8 @@ void HttpPullLightControl::setup() {
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// Go on with generating a unique ID and splitting the URL into parts
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uniqueId = generateUniqueId(); // Cache the unique ID
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DEBUG_PRINT(F("UniqueId calculated: "));
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DEBUG_PRINTLN(uniqueId);
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parseUrl();
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DEBUG_PRINTLN(F("HttpPullLightControl successfully setup"));
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}
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@ -42,20 +44,51 @@ void HttpPullLightControl::loop() {
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// Generate a unique ID based on the MAC address and a SALT
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String HttpPullLightControl::generateUniqueId() {
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// We use an easy to implement Fowler–Noll–Vo hash function so we dont need any Sha1.h or Crypto.h dependencies
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uint8_t mac[6];
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WiFi.macAddress(mac);
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char macStr[18];
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sprintf(macStr, "%02x:%02x:%02x:%02x:%02x:%02x", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
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String input = String(macStr) + salt;
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unsigned long hashValue = FNV_offset_basis;
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for (char c : input) {
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hashValue *= FNV_prime;
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hashValue ^= c;
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}
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DEBUG_PRINT(F("Unique ID generated: "));
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DEBUG_PRINTLN(hashValue);
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return String(hashValue);
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// Set the MAC Address to a string and make it UPPERcase
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String macString = String(macStr);
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macString.toUpperCase();
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DEBUG_PRINT(F("WiFi MAC address is: "));
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DEBUG_PRINTLN(macString);
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DEBUG_PRINT(F("Salt is: "));
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DEBUG_PRINTLN(salt);
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String input = macString + salt;
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#ifdef ESP8266
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// For ESP8266 we use the Hash.h library which is built into the ESP8266 Core
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return sha1(input);
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#endif
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#ifdef ESP32
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// For ESP32 we use the mbedtls library which is built into the ESP32 core
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int status = 0;
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unsigned char shaResult[20]; // SHA1 produces a hash of 20 bytes (which is 40 HEX characters)
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mbedtls_sha1_context ctx;
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mbedtls_sha1_init(&ctx);
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status = mbedtls_sha1_starts_ret(&ctx);
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if (status != 0) {
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DEBUG_PRINTLN(F("Error starting SHA1 checksum calculation"));
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}
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status = mbedtls_sha1_update_ret(&ctx, reinterpret_cast<const unsigned char*>(input.c_str()), input.length());
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if (status != 0) {
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DEBUG_PRINTLN(F("Error feeding update buffer into ongoing SHA1 checksum calculation"));
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}
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status = mbedtls_sha1_finish_ret(&ctx, shaResult);
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if (status != 0) {
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DEBUG_PRINTLN(F("Error finishing SHA1 checksum calculation"));
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}
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mbedtls_sha1_free(&ctx);
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// Convert the Hash to a hexadecimal string
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char buf[41];
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for (int i = 0; i < 20; i++) {
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sprintf(&buf[i*2], "%02x", shaResult[i]);
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}
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return String(buf);
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#endif
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}
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// This function is called when the user updates the Sald and so we need to re-calculate the unique ID
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@ -63,6 +96,8 @@ void HttpPullLightControl::updateSalt(String newSalt) {
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DEBUG_PRINTLN(F("Salt updated"));
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this->salt = newSalt;
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uniqueId = generateUniqueId();
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DEBUG_PRINT(F("New UniqueId is: "));
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DEBUG_PRINTLN(uniqueId);
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}
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// The function is used to separate the URL in a host part and a path part
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@ -1,7 +1,7 @@
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#pragma once
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/*
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* Usermod: HttpPullLightControl
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* Versie: 0.0.3
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* Versie: 0.0.4
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* Repository: https://github.com/roelbroersma/WLED-usermodv2_HttpPullLightControl
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* Author: Roel Broersma
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* Website: https://www.roelbroersma.nl
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@ -19,7 +19,16 @@
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#include "wled.h"
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#define HTTP_PULL_LIGHT_CONTROL_VERSION "0.0.3"
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// Use the following for SHA1 computation of our HASH, unfortunatelly PlatformIO doesnt recognize Hash.h while its already in the Core.
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// We use Hash.h for ESP8266 (in the core) and mbedtls/sha256.h for ESP32 (in the core).
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#ifdef ESP8266
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#include <Hash.h>
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#endif
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#ifdef ESP32
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#include "mbedtls/sha1.h"
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#endif
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#define HTTP_PULL_LIGHT_CONTROL_VERSION "0.0.4"
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class HttpPullLightControl : public Usermod {
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private:
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