libraries: add wip Firebase client library

Author: proppy

libraries/Firebase/Firebase.cpp

@@ -0,0 +1,77 @@
+#include "Firebase.h"
+#include "Client.h"
+
+FirebaseRef::FirebaseRef(FirebaseRoot& root, const String& path) : _root(root), _path(path) {
+}
+
+FirebaseRef& FirebaseRef::root()  {
+  return _root;
+}
+
+String FirebaseRef::value() {
+  return _root.makeRequest("GET", _path, "");
+}
+
+String FirebaseRef::set(const String& key, const String& value) {
+  return _root.makeRequest("PUSH", _path + "/" + key, value);
+}
+
+String FirebaseRef::push(const String& value) {
+  return _root.makeRequest("POST", _path, value);
+}
+
+FirebaseRef FirebaseRef::child(const String& key) {
+  return FirebaseRef(_root, _path + "/" + key);
+}
+
+FirebaseRoot::FirebaseRoot() : FirebaseRef(*this, "") {
+}
+
+void FirebaseRoot::begin(Client& client, const String& host) {
+  _client = &client;
+  _host = host;
+}
+
+void FirebaseRoot::auth(const String& token) {
+  _token = token;
+}
+
+void FirebaseRoot::setError(const String& err) {
+  _err = err;
+}
+
+const String& FirebaseRoot::error() {
+  return _err;
+}
+
+String FirebaseRoot::makeRequest(const String& method, const String& path, const String& data) {
+  _err = "";
+  
+  if (!_client->connect(_host.c_str(), 443)) {
+    setError("failed to connect");
+    return "";
+  }    
+  String req;
+  req += method + " " + path + ".json";
+  if (_token.length() > 0) {
+    req += "?auth=" + _token;
+  }
+  req += " HTTP/1.1\r\n";
+  req += "Host: " + _host + "\r\n";
+  req += "User-Agent: Arduino\r\n";
+  req += "Connection: close\r\n";
+  if (data.length()) {
+    req += "Content-Length: ";
+    req += data.length();
+    req += "\r\n\r\n";
+    req += data;
+  }
+  _client->print(req);
+  String resp;
+  while(_client->available() > 0) {
+    resp += _client->readStringUntil('\n');
+  }
+  return resp;
+}
+
+FirebaseRoot Firebase;

libraries/Firebase/Firebase.h

@@ -0,0 +1,40 @@
+#ifndef firebase_h
+#define firebase_h
+
+#include "WString.h"
+
+class Client;
+class FirebaseRoot;
+
+class FirebaseRef {
+ public:
+  FirebaseRef(FirebaseRoot& root, const String& path);
+  FirebaseRef& root();
+  String value();
+  String set(const String& key, const String& value);
+  String push(const String& value);
+  FirebaseRef child(const String& key);
+ private:
+  FirebaseRoot& _root;
+  String _path;  
+};
+
+class FirebaseRoot : public FirebaseRef {
+  friend FirebaseRef;
+ public:
+  FirebaseRoot();
+  void begin(Client& client, const String& host);
+  void auth(const String& token);
+  void setError(const String& err);
+  const String& error();
+ private:
+  String makeRequest(const String& method, const String& path, const String& data);
+  Client* _client;
+  String _host;
+  String _token;
+  String _err;  
+};
+
+extern FirebaseRoot Firebase;
+
+#endif // firebase_h

libraries/Firebase/examples/FirebasePush_ESP8266/FirebasePush_ESP8266.ino

@@ -0,0 +1,29 @@
+#include <ESP8266WiFi.h>
+#include <WiFiClientSecure.h>
+
+#include <Firebase.h>
+
+WiFiClientSecure wifiClient;
+
+int pushButtonPin = 1;
+int previousState = 1;
+
+void setup() {
+    pinMode(pushButtonPin, INPUT);
+    digitalWrite(pushButtonPin, HIGH);
+ 
+    Serial.begin(9600);
+
+    WiFi.begin("my-ssid", "my-password");
+    Firebase.begin(wifiClient, "my-firebase.firebaseio.com");
+    Firebase.auth("my-firebase-token-or-secrent");
+}
+
+void loop() {
+  int buttonState = digitalRead(pushButtonPin);
+  if (buttonState == 0 && buttonState != previousState) {
+    String record = Firebase.child("hits").push("{\".sv\": \"timestamp\"}");
+    Serial.print(record);
+  }
+  previousState = buttonState;
+}