WIP: make it possible for users to sign activities

src/activity_pub/sign.rs

@@ -1,20 +1,19 @@
 use base64;
+use diesel::PgConnection;
 use hex;
 use chrono::Utc;
 use openssl::sha::sha256;
 use serde_json;
 
-// (Comments are from the Mastodon source code, to remember what to do.)
-
 pub trait Signer {
-    fn get_key_id(&self) -> String;
+    fn get_key_id(&self, conn: &PgConnection) -> String;
     
     /// Sign some data with the signer keypair
-    fn sign(&self, to_sign: String) -> String; // Base64.strict_encode64(creator.keypair.sign(OpenSSL::Digest::SHA256.new, to_be_signed))
+    fn sign(&self, to_sign: String) -> Vec<u8>;
 }
 
 pub trait Signable {
-    fn sign<T>(&mut self, creator: T) -> &mut Self where T: Signer;
+    fn sign<T>(&mut self, creator: T, conn: &PgConnection) -> &mut Self where T: Signer;
 
     fn hash(data: String) -> String {
         let bytes = data.into_bytes();
@@ -23,15 +22,18 @@ pub trait Signable {
 }
 
 impl Signable for serde_json::Value {
-    fn sign<T>(&mut self, creator: T) -> &mut serde_json::Value where T: Signer {
+    fn sign<T: Signer>(&mut self, creator: T, conn: &PgConnection) -> &mut serde_json::Value {
+        let creation_date = Utc::now().to_rfc3339();
         let mut options = json!({
             "type": "RsaSignature2017",
-            "creator": creator.get_key_id(), // [ActivityPub::TagManager.instance.uri_for(creator), '#main-key'].join,
-            "created": Utc::now().to_rfc3339()
+            "creator": creator.get_key_id(conn),
+            "created": creation_date
         });
 
-        //options_hash  = hash(options.without('type', 'id', 'signatureValue').merge('@context' => CONTEXT))
-        let options_hash = Self::hash(String::from(""));
+        let options_hash  = Self::hash(json!({
+            "@context": "https://w3id.org/identity/v1",
+            "created": creation_date
+        }).to_string());
         let document_hash = Self::hash(self.to_string());
         let to_be_signed = options_hash + &document_hash;