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frafra · May 25, 2019 · cfb5e33 · cfb5e33
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diff --git a/.gitignore b/.gitignore
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+/target
+**/*.rs.bk
diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
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+[package]
+name = "frakegps"
+version = "0.1.0"
+authors = ["Francesco Frassinelli <fraph24@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+time = "0.1"
+web-view = "0.4.1"
diff --git a/README.md b/README.md
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+# Description
+
+FrakeGPS simulates a simple GPS receiver which emits NMEA codes. The location is selected clicking on a map, using [web-view](https://github.com/Boscop/web-view) and [Leaflet](http://leafletjs.com/).
+
+![frakegps-gpsmon](https://user-images.githubusercontent.com/4068/58375414-ba3b3900-7f52-11e9-88bb-c6db1299eff0.png)
+
+# Build
+
+## Dependencies
+
+- cargo
+- gpsd
+- webkit2gtk (devel)
+
+### Fedora
+
+```
+dnf install cargo gpsd webkit2gtk3-devel
+```
+
+## Compile
+
+```
+cargo build
+```
+
+# Usage
+
+## Usage with gpsd
+
+```
+./target/debug/frakegps |& gpsd -n -N /dev/stdin
+```
+
+## Usage with geoclue
+
+```
+./target/debug/frakegps |& nc -kl 10110
+avahi-publish -s "FrakeGPS for $(hostname)"  _nmea-0183._tcp 10110 "FrakeGPS service"
+```
+
+Note: Unreliable results with avahi.
diff --git a/src/dist/map.css b/src/dist/map.css
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+body {
+    margin: 0;
+    height: 100vh;
+    display: flex;
+    flex-direction: column;
+}
+#map {
+    flex-grow: 1;
+    width: 100%;
+}
diff --git a/src/dist/map.html b/src/dist/map.html
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+<!DOCTYPE html>
+<html>
+<head>
+	<title>FrakeGPS</title>
+	<meta charset="utf-8" />
+	<meta name="viewport" content="width=device-width, initial-scale=1.0">
+	<link rel="shortcut icon" type="image/x-icon" href="docs/images/favicon.ico" />
+    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.5.1/dist/leaflet.css" integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ==" crossorigin=""/>
+    <script src="https://unpkg.com/leaflet@1.5.1/dist/leaflet.js" integrity="sha512-GffPMF3RvMeYyc1LWMHtK8EbPv0iNZ8/oTtHPx9/cc2ILxQ+u905qIwdpULaqDkyBKgOaB57QTMg7ztg8Jm2Og==" crossorigin=""></script>
+    {styles}
+</head>
+<body>
+<div id="map"></div>
+{scripts}
+</body>
+</html>
+
diff --git a/src/dist/map.js b/src/dist/map.js
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+var map = L.map('map').setView([63.42682, 10.40163], 13);
+
+L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
+	maxZoom: 18,
+	attribution: 'Map data © <a href="https://openstreetmap.org">OpenStreetMap</a> contributors',
+	id: 'osm.standard'
+}).addTo(map);
+
+var maker = L.marker();
+map.on('click', function(event) {
+    maker.remove()
+    maker = L.marker(event.latlng);
+    maker.addTo(map);
+    external.invoke([event.latlng.lat, event.latlng.lng]);
+});
diff --git a/src/main.rs b/src/main.rs
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+mod nmea;
+
+extern crate web_view;
+use web_view::*;
+
+fn main() -> WVResult {
+    let html = format!(include_str!("dist/map.html"),
+		styles = inline_style(include_str!("dist/map.css")),
+        scripts = inline_script(include_str!("dist/map.js")),
+    );
+    let webview = web_view::builder()
+        .title("FrakeGPS")
+        .content(Content::Html(html))
+        .size(800, 600)
+        .resizable(true)
+        .debug(true)
+        .user_data(())
+        .invoke_handler(|_webview, arg| {
+            let latlon: Vec<&str> = arg.split(",").collect();
+            let lat: f64 = latlon[0].parse().unwrap();
+            let lon: f64 = latlon[1].parse().unwrap();
+            println!("{}", nmea::rmc(lat, lon));
+            Ok(())
+        })
+        .build()?;
+    webview.run()
+}
+
+fn inline_style(s: &str) -> String {
+    format!(r#"<style type="text/css">{}</style>"#, s)
+}
+
+fn inline_script(s: &str) -> String {
+    format!(r#"<script type="text/javascript">{}</script>"#, s)
+}
diff --git a/src/nmea.rs b/src/nmea.rs
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+extern crate time;
+
+fn dec_to_dm(dec: f64) -> f64 {
+    let deg = dec.abs().floor();
+    let min = (dec-deg)*60.0/100.0;
+    deg+min
+}
+
+fn checksum(message: &String) -> String {
+    let mut checksum = 0;
+    for character in message.bytes() {
+        checksum ^= character;
+    }
+    format!("{:02X}", checksum)
+}
+
+pub fn rmc(lat: f64, lon: f64) -> String {
+    let lat_nmea = format!("{:08.3}", dec_to_dm(lat)*100.0);
+    let lon_nmea = format!("{:09.3}", dec_to_dm(lon)*100.0);
+    let ns = if lat.is_sign_negative() { 'S' } else { 'N' };
+    let ew = if lon.is_sign_negative() { 'W' } else { 'E' };
+    let now = time::now_utc();
+    let date = now.strftime("%d%m%y").unwrap();
+    let timestamp = now.strftime("%H%M%S").unwrap();
+    let message = [
+            "GPRMC",
+            &timestamp.to_string(),
+            "A", // A: valid, V: invalid
+            &lat_nmea,
+            &ns.to_string(),
+            &lon_nmea,
+            &ew.to_string(),
+            "0", // speed over ground (knots)
+            "0", // course over ground (degrees)
+            &date.to_string(),
+            "", // magnetic variation (degrees)
+            "", // E/W (east/west)
+        ].join(",");
+    let checksum = checksum(&message);
+    format!("${}*{}", message, checksum)
+}