upload: add framework for types and auth mods

upload/src/auth.rs

···
+pub struct Session {
+  pds: String,
+  id: crate::config::Id,
+}

upload/src/main.rs

···
+mod auth;
 mod config;
+mod types;
 
 fn main() -> Result<(), ()> {
   let config = config::extract();

upload/src/types.rs

···
+pub enum Did {
+  Web(String),
+  Plc(String),
+}
+
+enum DidError {
+  UnknownMethod,
+  MalformedDid,
+}
+
+impl Did {
+  fn from(did: String) -> Result<Did, DidError> {
+    if did.starts_with("did:plc:") {
+      return Ok(Did::Plc(String::from(did[8..])));
+    } else if did.starts_with("did:web:") {
+      return Ok(Did::Plc(String::from(did[8..])));
+    } else if did.starts_with("did:") {
+      return Err(DidError::UnknownMethod);
+    } else {
+      return Err(DidError::MalformedDid);
+    }
+  }
+}
+
+pub struct User {
+  handle: Option<String>,
+  did: Did,
+  pds: String,
+}
+
+enum UserFromErr {
+  InvalidHandle,
+  NoDidForHandle,
+  HandleNotBidirectional,
+  DidParseError(DidError),
+  DidNotBidirectional,
+  NoPds,
+}
+
+impl User {
+  fn fromHandle(handle: String) -> Result<User, UserFromErr> {}
+
+  fn fromDid(did: String) -> Result<User, UserFromErr> {}
+}