Resolve did:plc and did:web to did docs

TODO:
- parse did doc to get relevant info (pds)
- validate that dids match

src/did.rs

···
     };
     return Ok(String::from(did));
 }
+
+fn parse_doc(did: String, text: String) -> Result<DidDoc, ()> {
+    return Ok(DidDoc { did: String::new() });
+}
+
+fn get_plc_doc(plc: &str) -> Result<DidDoc, ()> {
+    let res = match reqwest::blocking::get("https://plc.directory/did:plc".to_owned() + plc) {
+        Ok(val) => val,
+        Err(_) => return Err(()),
+    };
+
+    if !res.status().is_success() {
+        return Err(());
+    }
+
+    return parse_doc(
+        "did:plc:".to_owned() + plc,
+        match res.text() {
+            Ok(val) => val,
+            Err(_) => return Err(()),
+        },
+    );
+}
+
+fn get_web_doc(web: &str) -> Result<DidDoc, ()> {
+    let res = match reqwest::blocking::get("https://".to_owned() + web + "/.well-known/did.json") {
+        Ok(val) => val,
+        Err(_) => return Err(()),
+    };
+
+    if !res.status().is_success() {
+        return Err(());
+    }
+
+    return parse_doc(
+        "did:web:".to_owned() + web,
+        match res.text() {
+            Ok(val) => val,
+            Err(_) => return Err(()),
+        },
+    );
 }
 
 pub fn get_did(handle: String) -> Result<DidDoc, ()> {
···
         }
     };
 
-    return Ok(DidDoc { did });
+    let did_doc = if did.starts_with("did:plc:") {
+        get_plc_doc(&did[8..])
+    } else if did.starts_with("did:web:") {
+        get_web_doc(&did[8..])
+    } else {
+        Err(())
+    };
+
+    return did_doc;
 }