first implementation

src/public_ip.rs

@@ -0,0 +1,38 @@
+use regex::Regex;
+use reqwest::blocking::Client;
+
+use crate::errors::Error;
+
+pub fn get_public_ip_address() -> Result<String, Error> {
+    //see https://wiki.ubuntuusers.de/FritzBox/Skripte/
+
+    let resp = Client::new()
+        .post("http://fritz.box:49000/igdupnp/control/WANIPConn1")
+        .header("Content-Type", "text/xml; charset=utf-8")
+        .header(
+            "SoapAction",
+            "urn:schemas-upnp-org:service:WANIPConnection:1#GetExternalIPAddress",
+        )
+        .body("<?xml version='1.0' encoding='utf-8'?> <s:Envelope s:encodingStyle='http://schemas.xmlsoap.org/soap/encoding/' xmlns:s='http://schemas.xmlsoap.org/soap/envelope/'> <s:Body> <u:GetExternalIPAddress xmlns:u='urn:schemas-upnp-org:service:WANIPConnection:1' /> </s:Body> </s:Envelope>")
+        .send()
+        .map_err(|_| Error::new("Error fetching result via Http"))?;
+
+    if resp.status() != 200 {
+        return Err(Error::new(&format!("Status: {}", resp.status())));
+    }
+
+    let xml = resp.text().map_err(|_| Error::new("No data"))?;
+
+    let regex = Regex::new(r"(?:[0-9]{1,3}\.){3}[0-9]{1,3}")
+        .map_err(|_| Error::new("Regex parsing error"))?;
+
+    let text = regex
+        .captures(&xml)
+        .map(|cap| cap.get(0))
+        .flatten()
+        .map(|cap| cap.as_str())
+        .map(|str| String::from(str))
+        .ok_or(Error::new("Regex no match"));
+
+    text
+}