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@@ -1,34 +1,70 @@
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<?php
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-// check for a POST request and use curl to send data to the esp8266
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+/* wrapper for curl, sends a single parameter to the esp8266, no attempt is made to interpret
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+ * user data, except that we protect curl from possible injection. Because protection is heavy
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+ * handed, end-user data can easily be mangled, as in, if it isn't formatted right it is going to
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+ * be forced through a correctly formatted die
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+ */
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+function curl($postParam, $len, $route, $varName = "var") {
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+ $uri = "http://rain-gutter-rgb.lan.rome7.com/{$route}";
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+ $unsafeUserData = "";
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+ // start with an empty, off, or "zeroed" buffer
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+ for($i = $len; $i--;) $unsafeUserData .= "0";
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+ // [!] protect curl from injection, only allow hexidecimal digits 0..9a..fA..F]
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+ for($i = $len; $i--; ) $unsafeUserData[$i] = (isset($_POST[$postParam][$i]) && ctype_xdigit($_POST[$postParam][$i]))
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+ ? $_POST[$postParam][$i]
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+ : '0';
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+ $ch = curl_init();
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+ error_log("sending [{$postParam}] '{$unsafeUserData}' to {$uri}");
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+ curl_setopt($ch, CURLOPT_URL, $uri);
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+ curl_setopt($ch, CURLOPT_POST, 1);
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+ curl_setopt($ch, CURLOPT_POSTFIELDS, "{$postParam}={$unsafeUserData}");
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+ curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
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+ $out = curl_exec($ch);
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+ curl_close($ch);
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+ return $out;
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+}
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+
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+/* check for a POST request and use curl to send data to the esp8266
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+ * default response is http bad request
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+ * passthru contains a simple description of the esp8266 api
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+ */
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if ($_SERVER['REQUEST_METHOD'] === 'POST') {
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- $code = 400;
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- $msg = strval($code) . " Bad Request";
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- //error_log("post: " . print_r($_POST, true));
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- if(isset($_POST["color"])) {
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- // adject code and message when valid post is provided
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- $code = 200;
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- $msg = strval($code) . " OK";
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- // start with off as default
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- $color = "000000";
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- // [!] protect curl from injection
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- for($i = 6; $i--; ) $color[$i] = (isset($_POST["color"][$i]) && ctype_xdigit($_POST["color"][$i]))
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- ? $_POST["color"][$i]
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- : '0';
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+ $code = 400; $out = "";
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+ $passthru = array(
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+ // POST_VARIABLE => [buffer-length, api-endpoint]
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+ "color" => array(6, "rgb"),
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+ "brightness" => array(2, "brightness")
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+ );
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+ // execute the first matching command
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+ foreach($passthru as $k => $v) {
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+ if(!isset($_POST[$k])) continue; $out = curl($k, $v[0], $v[1]); $code = 200; break; }
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+ // set headers
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+ header("HTTP/1.0 " . strval($code) . (200 === $code ?" OK" : " Bad Request"));
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+ $GLOBALS["http_response_code"] = $code;
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+ //http_response_code($code);
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+ exit("{$out}");
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+} /* else GET request, check for quick response parameters -- do not generate whole page */ {
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+ if(isset($_GET['req'])) {
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+ // default is to get color as decimal [0..255] values R,G,B
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+ $req = "dec";
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+ switch($_GET['req']) {
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+ case "color": $req = "dec"; break;
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+ case "brightness": $req = "brightness"; break;
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+ case "correction": $req = "cfg"; break;
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+ }
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+ $uri = "http://rain-gutter-rgb.lan.rome7.com/{$req}";
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+ // send GET request to the esp8266
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$ch = curl_init();
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- curl_setopt($ch, CURLOPT_URL,"http://rain-gutter-rgb.lan.rome7.com/rgb");
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- curl_setopt($ch, CURLOPT_POST, 1);
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- curl_setopt($ch, CURLOPT_POSTFIELDS, "color={$color}");
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+ error_log("sending [get: {$req}] via {$uri}");
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+ curl_setopt($ch, CURLOPT_URL, $uri);
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
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$out = curl_exec($ch);
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curl_close($ch);
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+ exit($out);
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}
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- // set headers
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- header("HTTP/1.0 {$msg}");
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- $GLOBALS["http_response_code"] = $code;
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- //http_response_code($code);
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- exit("{$out}");
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}
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+// otherwise - generate a whole web-page
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echo "<html>";
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echo "<body>";
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// either use mixbox non-commercial use under the CC BY-NC 4.0 license
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@@ -64,6 +100,66 @@ console.log(color);
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</script>
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";
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+// common functions
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+echo "
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+<script>
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+// using the newer fetch API, not sure if this is worse than AJAX
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+async function post(url = '', kw = 'key', data = 'data') {
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+ // to use _POST superblogal, send body as http multipart/form-data
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+ let fd = new FormData();
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+ fd.append(kw, data);
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+ return await fetch(url, { method: 'POST', body: fd });
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+}
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+/* I assume http get requests may use default
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+ * [fetch](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API)
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+ * parameters.
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+ */
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+function get(arg) { return fetch('?' + new URLSearchParams({req:arg})).then((v) => v.text()); }
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+function getColor(selectedObj = null) {
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+ // get the color from the esp8266, returns as decimal [0..255] R,G,B
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+ let dec = get('color');
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+ // split into red, green, and blue components:
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+ let rgb = dec.then((v) => { let a = v.split(',').map((i) => parseInt(i, 10)); return {red: a[0], green: a[1], blue: a[2]}; });
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+ rgb.then((v) => console.log('esp8266 color: ', v));
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+ // by default, return as Promise that will resolve to rgb object { red: x, green: y, blue: z }
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+ if(null === selectedObj) return rgb;
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+ // otherwise set backround and text of the selected color object
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+ rgb.then((v) => {
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+ let a = [v.red, v.green, v.blue];
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+ color = 'rgb(' + a.join(',') + ')';
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+ let off = a.every((x) => 0 === x);
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+ // use gray as a placeholder for 'lights off'
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+ selectedObj.style.background = off ?'rgb(211, 211, 211)' :color;
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+ selectedObj.textContent = color;
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+ });
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+}
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+function getBrightness(sliderObj = null) {
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+ // get the brightness from the esp8266, returns as decimal [0..15]
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+ let brightness = get('brightness').then((v) => parseInt(v,10));
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+ brightness.then((i) => { console.log('esp8266 brightness: ', i); });
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+ // by default, return as Promise that will resolve to integer
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+ if(null === sliderObj) return brightness;
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+ // otherwise set slider object's value property to brightness when the promise resolves
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+ brightness.then((i) => { sliderObj.value = i; });
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+}
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+function getCorrection() {
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+ /* get the correction config from the esp8266, returns as cfg [ setting:[0..1], ... setting_n:[0..1]]
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+ * settings currently include:
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+ * quickGamma - corrects for human perception using quadratic function
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+ * sCurveGamma - corrects for human perception using sigmoid function
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+ * colorCorrection - LED manufacturer correction, differences between doping used for different colors
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+ *
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+ * + quickGamma and sCurveGamma can be turned on or off and are are mutually
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+ * exclusive to eachother
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+ * + colorCorrection may be turned on or off, and can be applied to either
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+ * gamma correction schemes
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+ */
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+ var cfg = get('correction');
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+ return cfg;
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+}
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+</script>
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+";
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+
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// render a color selection wheel
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echo "
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<script>
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@@ -71,7 +167,7 @@ var canvas = document.createElement('canvas');
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// google chrome performance flag
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//var context = canvas.getContext('2d');
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var context = canvas.getContext('2d', { willReadFrequently: true });
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-var w = 200; var h = 200;
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+var w = 400; var h = 400;
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canvas.width = w;
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canvas.height = h;
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@@ -126,6 +222,9 @@ tableBodyRow.appendChild(selected);
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document.body.appendChild(table);
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+// set the inital value of the selected color cell to the esp8266 lights
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+getColor(selected);
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+
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// listen to events from canvas
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function pick(event, destination, cb = false) {
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const bounding = canvas.getBoundingClientRect();
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@@ -137,6 +236,7 @@ function pick(event, destination, cb = false) {
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const rgb = 'rgb(' + data[0] + ', ' + data[1] + ', ' + data[2] + ')';
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let off = 0 === (data[0] | data[1] | data[2]);
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+ // use 211,211,211 (gray) as a placeholder for 'lights turned off'
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destination.style.background = off ?'rgb(211, 211, 211)' :rgb;
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destination.textContent = rgb;
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@@ -155,18 +255,12 @@ canvas.addEventListener('click', (event) => pick(event, selected));
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// add a callback to the click event to send rgb value to esp8266
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echo "
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<script>
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-// using the newer fetch API, not sure if this is worse than AJAX
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-async function post(url = '', color = '000000') {
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- // to use _POST superblogal, send body as http multipart/form-data
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- let fd = new FormData();
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- fd.append('color', color);
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- return await fetch(url, { method: 'POST', body: fd });
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-}
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function sg(x) { return Math.round((x*x)/255); }
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function callback(red, green, blue) {
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console.log('logged', red, green, blue);
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post(
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/* url */ '',
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+ /* key */ 'color',
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sg(red).toString(16).padStart(2,'0') +
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sg(green).toString(16).padStart(2,'0') +
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sg(blue).toString(16).padStart(2,'0')
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@@ -178,5 +272,58 @@ canvas.addEventListener('click', (event) => pick(event, selected, callback));
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</script>
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";
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+/* make a brightness slider, esp8266 takes 0..15 levels of brightness
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+ * zero is off and should be ignored
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+ *
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+ * currently brightness control is very simple and operates without
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+ * modifying end-user color choices
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+ *
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+ * tldr; users have 24bit color selectivity, in hardware we have a
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+ * little over 1.5 bytes per color giving us somewhere near 37bit color
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+ * selectivity. so a user can select 0a3bcc as their color choise and
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+ * we can have thousands of shades of colors that are close to that.
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+ * The power section of the esp8266 is not optimal so the esp8266 will
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+ * limit running the LEDs at maximum current. This limits the color-space
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+ * by about 20%. The way we implement brightness is to cut give the end
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+ * user 24-bits of color selectivity, that fits into 1/20th of the color-space
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+ * then we can multiply those values linearly 1..15 before we hit that 80%
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+ * power limit. because we are amplifying colors evenly the selected output
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+ * color will not change.
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+ */
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+echo "
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+<script>
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+var slider = document.createElement('input');
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+slider.type = 'range';
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+slider.min = 1;
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+slider.max = 15;
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+slider.value = 7;
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+slider.step = 1;
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+document.body.appendChild(slider);
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+
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+// set the inital value of the slider to whatever the current brightness value
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+getBrightness(slider);
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+
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+function slid(event, cb = false) {
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+ if(false !== cb) cb(slider.value);
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+ console.log('changed slider to ' + slider.value);
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+ return 'brightness(' + slider.value + ')';
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+}
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+
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+slider.addEventListener('change', (event) => slid(event));
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+</script>
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+";
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+// add a callback to the off-click event on the slider
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+echo "
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+<script>
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+function slidercb(valu) {
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+ console.log('logged', valu);
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+ post('', 'brightness', parseInt(valu, 10).toString(16).padStart(2,'0')).then((data) => { console.log(data, data.text()); });
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+}
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+slider.removeEventListener('change', (event) => slid(event));
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+slider.addEventListener('change', (event) => slid(event, slidercb));
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+
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+</script>
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+";
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+
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echo "</body>";
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echo "</html>";
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kyle