First commit.

.github/FUNDING.yml

@@ -0,0 +1,12 @@
+# These are supported funding model platforms
+
+github: # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: # Replace with a single Liberapay username
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: ["https://www.paypal.me/mobizt"] # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,34 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: BUG
+labels: bug, good first issue, invalid, wontfix
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**IDE and its version:**
+ - Arduino, PlatformIO
+ - Version [e.g. 1.8.9]
+
+**ESP8266 Arduino Core SDK version**
+ - Version [e.g. 2.5.1]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,20 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ENHANCEMENT
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/help-and-question.md

@@ -0,0 +1,10 @@
+---
+name: Help and Question
+about: Usage problems and how to (should read the readme or try the examples first)
+title: HELP
+labels: help wanted, question
+assignees: ''
+
+---
+
+

.github/stale.yml

@@ -0,0 +1,17 @@
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 20
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 5
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - pinned
+  - security
+# Label to use when marking an issue as stale
+staleLabel: wontfix
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed if no further activity occurs. Thank you
+  for your contributions.
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: false

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2021 mobizt
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -1 +1,82 @@
-# ESP-Signer
+# Google OAuth2.0 Access Token generation Arduino Library v1.0.0
+
+
+This is the library will create the OAuth2.0 access token used in the Google API's http request (REST).
+
+The Service Account credentials e.g. project host, project id, email and private key which are available in the service account key file will be used.
+
+This library supports ESP8266 and ESP32 MCU from Espressif. 
+
+
+## Tested Devices
+
+ * Wemos D1 Mini
+ * NodeMCU (ESP8266)
+ * ESP-12F
+ * LinkNode (ESP8266)
+ * Sparkfun ESP32 Thing
+ * NodeMCU-32
+ * WEMOS LOLIN32
+ * TTGO T8 V1.8
+
+
+
+## Dependencies
+
+
+This library required **ESP8266 or ESP32 Core SDK**.
+
+For Arduino IDE, ESP8266 Core SDK can be installed through **Boards Manager**. 
+
+For PlatfoemIO IDE, ESP8266 Core SDK can be installed through **PIO Home** > **Platforms** > **Espressif 8266 or Espressif 32**.
+
+
+
+## Installation
+
+
+For Arduino IDE, download zip file from the repository (Github page) by select **Code** dropdown at the top of repository, select **Download ZIP** 
+
+From Arduino IDE, select menu **Sketch** -> **Include Library** -> **Add .ZIP Library...**.
+
+Choose **ESP-Signer-main.zip** that previously downloaded.
+
+Go to menu **Files** -> **Examples** -> **ESP-Signer-main** and choose one from examples.
+
+
+
+
+
+## Usages
+
+
+See [this](/examples) for complete usages.
+
+
+
+
+
+## License
+
+The MIT License (MIT)
+
+Copyright (c) 2021 K. Suwatchai (Mobizt)
+
+
+Permission is hereby granted, free of charge, to any person returning a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+

examples/Basic/Basic.ino

@@ -0,0 +1,90 @@
+#include <Arduino.h>
+#include <Arduino.h>
+#if defined(ESP32)
+#include <WiFi.h>
+#elif defined(ESP8266)
+#include <ESP8266WiFi.h>
+#endif
+
+#include "ESPSigner.h"
+
+#define WIFI_SSID "WiFi SSID"
+#define WIFI_PASSWORD "WIFi PSK"
+
+
+#define PROJECT_HOST "The project host without cheme (https://)"
+
+/** These credentials are taken from Service Account key file (JSON)
+ * https://cloud.google.com/iam/docs/service-accounts
+*/
+#define PROJECT_ID "The project ID"
+#define CLIENT_EMAIL "Client Email"
+#define PRIVATE_KEY_ID "e172ba5eb712aea49938280fe3be3b9508dfbe0f"
+const char PRIVATE_KEY[] PROGMEM = "-----BEGIN PRIVATE KEY-----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\nUBegcEvgBSXRPrZUCgKgHVG+\n-----END PRIVATE KEY-----\n";
+
+
+SignerConfig config;
+
+void tokenStatusCallback(TokenInfo info);
+
+void setup()
+{
+
+    Serial.begin(115200);
+    Serial.println();
+    Serial.println();
+
+    WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
+    Serial.print("Connecting to Wi-Fi");
+    while (WiFi.status() != WL_CONNECTED)
+    {
+        Serial.print(".");
+        delay(300);
+    }
+    Serial.println();
+    Serial.print("Connected with IP: ");
+    Serial.println(WiFi.localIP());
+    Serial.println();
+
+    /* Assign the project host (required) */
+config.host = PROJECT_HOST;
+
+/* Assign the sevice account credentials and private key (required) */
+config.service_account.data.client_email = CLIENT_EMAIL;
+config.service_account.data.project_id = PROJECT_ID;
+config.service_account.data.private_key = PRIVATE_KEY;
+
+/** Assign the API scopes (required) 
+     * Use space or comma to separate the scope.
+    */
+config.signer.tokens.scope = "https://www.googleapis.com/auth/cloud-platform, https://www.googleapis.com/auth/userinfo.email";
+
+/** Assign the callback function for token ggeneration status (optional) */
+config.token_status_callback = tokenStatusCallback;
+
+/* Create token */
+Signer.begin(&config);
+}
+
+void loop()
+{
+    delay(1000);
+
+    /* Check to status and also refresh the access token */
+    bool ready = Signer.tokenReady();
+}
+
+void tokenStatusCallback(TokenInfo info)
+{
+    if (info.status == esp_signer_token_status_error)
+    {
+        Serial.printf("Token info: type = %s, status = %s\n", Signer.getTokenType(info).c_str(), Signer.getTokenStatus(info).c_str());
+        Serial.printf("Token error: %s\n", Signer.getTokenError(info).c_str());
+    }
+    else
+    {
+        Serial.printf("Token info: type = %s, status = %s\n", Signer.getTokenType(info).c_str(), Signer.getTokenStatus(info).c_str());
+        if (info.status == esp_signer_token_status_ready)
+            Serial.printf("Token: %s\n", Signer.accessToken().c_str());
+    }
+}

examples/Service_Account_from_File/Service_Account_from_File.ino

@@ -0,0 +1,84 @@
+#include <Arduino.h>
+#include <Arduino.h>
+#if defined(ESP32)
+#include <WiFi.h>
+#elif defined(ESP8266)
+#include <ESP8266WiFi.h>
+#endif
+
+#include "ESPSigner.h"
+
+#define WIFI_SSID "WiFi SSID"
+#define WIFI_PASSWORD "WIFi PSK"
+
+#define PROJECT_HOST "The project host without cheme (https://)"
+
+
+SignerConfig config;
+
+void tokenStatusCallback(TokenInfo info);
+
+void setup()
+{
+
+    Serial.begin(115200);
+    Serial.println();
+    Serial.println();
+
+    WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
+    Serial.print("Connecting to Wi-Fi");
+    while (WiFi.status() != WL_CONNECTED)
+    {
+        Serial.print(".");
+        delay(300);
+    }
+    Serial.println();
+    Serial.print("Connected with IP: ");
+    Serial.println(WiFi.localIP());
+    Serial.println();
+
+    /* Assign the project host (required) */
+    config.host = PROJECT_HOST;
+
+    /* The file systems for flash and SD/SDMMC can be changed in FS_Config.h. */
+
+    /** Assign the sevice account JSON file and the file storage type (required) 
+     * https://cloud.google.com/iam/docs/service-accounts
+    */
+    config.service_account.json.path = "/service_account_file.json"; //change this for your json file
+    config.service_account.json.storage_type = esp_signer_mem_storage_type_flash; //or esp_signer_mem_storage_type_sd
+
+    /** Assign the API scopes (required) 
+     * Use space or comma to separate the scope.
+    */
+    config.signer.tokens.scope = "https://www.googleapis.com/auth/cloud-platform, https://www.googleapis.com/auth/userinfo.email";
+
+    /** Assign the callback function for token ggeneration status (optional) */
+    config.token_status_callback = tokenStatusCallback;
+
+    /* Create token */
+    Signer.begin(&config);
+}
+
+void loop()
+{
+    delay(1000);
+
+    /* Check to status and also refresh the access token */
+    bool ready = Signer.tokenReady();
+}
+
+void tokenStatusCallback(TokenInfo info)
+{
+    if (info.status == esp_signer_token_status_error)
+    {
+        Serial.printf("Token info: type = %s, status = %s\n", Signer.getTokenType(info).c_str(), Signer.getTokenStatus(info).c_str());
+        Serial.printf("Token error: %s\n", Signer.getTokenError(info).c_str());
+    }
+    else
+    {
+        Serial.printf("Token info: type = %s, status = %s\n", Signer.getTokenType(info).c_str(), Signer.getTokenStatus(info).c_str());
+        if (info.status == esp_signer_token_status_ready)
+            Serial.printf("Token: %s\n", Signer.accessToken().c_str());
+    }
+}