Flow Rust SDK Milestone 2

submissions/issue-20/milestone-1/flow-rust-sdk-team.md

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+##  Flow-Rust-SDK - Milestone 1
+
+This PR is for issue #20.
+
+
+
+### Milestone 1 Completion:
+- 1 [x] Implement the gRPC layer of the SDK, allowing communication with the Flow blockchain
+
+Inside the [lib.rs](https://github.com/MarshallBelles/flow-rust-sdk/blob/release/src/lib.rs) a gRPC client has been defined as a struct on line 38: `FlowConnection` which accepts a network transport layer of type `<T>`. A default implementation for type `tonic::transport::Channel` is implemented starting on line 43, using the [Tonic gRPC library](https://crates.io/crates/tonic) to facilitate communications.
+
+You can test this connection by instantiating the struct with the helper function `FlowConnection::new("grpc://address");`.
+
+A more full example of usage:
+```rs
+use flow_rust_sdk::*;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // instantiate a new connection:
+    let mut connection = FlowConnection::new("grpc://localhost:3569").await?;
+        // Substitute emulator service account address as the payer, and keys if needed.
+        let payer = "f8d6e0586b0a20c7";
+        let payer_private_key = "324db577a741a9b7a2eb6cef4e37e72ff01a554bdbe4bd77ef9afe1cb00d3cec";
+        let public_keys = vec!["ef100c2a8d04de602cd59897e08001cf57ca153cb6f9083918cde1ec7de77418a2c236f7899b3f786d08a1b4592735e3a7461c3e933f420cf9babe350abe0c5a".to_owned()];
+
+        // Use the connection defined above to send a transaction to the blockchain, created and signed within the helper function `create_account`
+        let acct = connection.create_account(
+            public_keys.to_vec(),
+            &payer.to_owned(),
+            &payer_private_key.to_owned(),
+            0,
+        )
+        .await
+        .expect("Could not create account");
+        println!("new account address: {:?}", hex::encode(acct.address));
+    Ok(())
+}
+```
+
+Authors include:
+
+    @marshallbelles
+    @bluesign

submissions/issue-20/milestone-2/flow-rust-sdk-team.md

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+##  Flow-Rust-SDK - Milestone 2
+
+This PR is for issue #20.
+
+
+
+### Milestone 2 Completion:
+- 2: Accomplish transaction signing in a way that handles the complex algorithm / hashing / encoding for the user.
+
+Transactional signing and RLP encoding turned out to be the most difficult and time-consuming task of this project.
+@bluesign provided a significant amount of help by sharing knowledge gained while working on his Swift SDK.
+
+Transaction signing is implemented in the Flow-Rust-SDK lib.rs [starting on line 466](https://github.com/MarshallBelles/flow-rust-sdk/blob/344d7d8f7aa2aa67c47455e54bedf4723138a981/src/lib.rs#L466). 
+
+The transaction payload RLP encoding takes place [on line 414](https://github.com/MarshallBelles/flow-rust-sdk/blob/344d7d8f7aa2aa67c47455e54bedf4723138a981/src/lib.rs#L414) and the transaction envelope is encoded [on line 370](https://github.com/MarshallBelles/flow-rust-sdk/blob/344d7d8f7aa2aa67c47455e54bedf4723138a981/src/lib.rs#L370).
+
+
+Before signing a transaction, you must first define and build one. This is demonstrated in the `create_account` function starting [on line 176](https://github.com/MarshallBelles/flow-rust-sdk/blob/344d7d8f7aa2aa67c47455e54bedf4723138a981/src/lib.rs#L176):
+```rs
+// The following is copied from the library.
+// To execute the code shown below, copy the example at: https://github.com/MarshallBelles/flow-rust-sdk-example/blob/main/src/main.rs
+// our default values passed into the transaction
+let payer = "f8d6e0586b0a20c7";
+let payer_private_key = "324db577a741a9b7a2eb6cef4e37e72ff01a554bdbe4bd77ef9afe1cb00d3cec";
+let public_keys = vec!["ef100c2a8d04de602cd59897e08001cf57ca153cb6f9083918cde1ec7de77418a2c236f7899b3f786d08a1b4592735e3a7461c3e933f420cf9babe350abe0c5a".to_owned()];
+
+// Define the transaction to be executed.
+// Here we are using AuthAccount to create a new account and assign keys
+let create_account_template = b"
+    transaction(publicKeys: [String], contracts: {String: String}) {
+        prepare(signer: AuthAccount) {
+            let acct = AuthAccount(payer: signer)
+
+            for key in publicKeys {
+                acct.addPublicKey(key.decodeHex())
+            }
+
+            for contract in contracts.keys {
+                acct.contracts.add(name: contract, code: contracts[contract]!.decodeHex())
+            }
+        }
+    }";
+
+// we get the latest block for the transaction
+let latest_block: BlockResponse = self.get_block(None, None, Some(false)).await?;
+// and then we need to get the authorizer account
+let account: flow::Account = self.get_account(payer.clone())
+    .await?
+    .account
+    .unwrap();
+// because then we need the proposal key details
+let proposer = TransactionProposalKey {
+    address: hex::decode(payer).unwrap(),
+    key_id,
+    sequence_number: account.keys[key_id as usize].sequence_number as u64,
+};
+// here we process the key arguments
+let keys_arg = process_keys_args(account_keys);
+// empty contracts for this example
+let contracts_arg = Argument::dictionary(vec![]);
+// the following two lines handles the arguments and turns them into JSON strings for the transaction.
+let keys_arg = json!(keys_arg);
+let contracts_arg = json!(contracts_arg);
+// build the transaction
+let transaction: Transaction = build_transaction(
+    create_account_template.to_vec(),
+    vec![
+        serde_json::to_vec(&keys_arg)?,
+        serde_json::to_vec(&contracts_arg)?,
+    ],
+    latest_block.block.unwrap().id,
+    1000,
+    proposer,
+    vec![payer.clone()],
+    payer.clone(),
+)
+.await?;
+
+// After building the transaction, we need to sign the transaction.
+// Here we define the signature
+let signature = Sign {
+    address: payer.clone(),
+    key_id,
+    private_key: payer_private_key.clone(),
+};
+
+// now we can sign the transaction
+let transaction: Option<Transaction> = sign_transaction(transaction, vec![], vec![&signature]).await?;
+
+// and send it to the blockchain
+let transaction: SendTransactionResponse = self.send_transaction(transaction).await?;
+
+// from here the library polls the blockchain for the transaction result
+```
+
+The part above where we `sign_transaction` looks like this:
+```rs
+pub async fn sign_transaction(
+    built_transaction: Transaction,
+    payload_signatures: Vec<&Sign>,
+    envelope_signatures: Vec<&Sign>,
+) -> Result<Option<Transaction>, Box<dyn error::Error>> {
+    let mut payload: Vec<TransactionSignature> = vec![];
+    let mut envelope: Vec<TransactionSignature> = vec![];
+    // for each of the payload private keys, sign the transaction
+    for signer in payload_signatures {
+        let encoded_payload: &[u8] = &payload_from_transaction(built_transaction.clone());
+        let mut domain_tag: Vec<u8> = b"FLOW-V0.0-transaction".to_vec();
+        // we need to pad 0s at the end of the domain_tag
+        padding(&mut domain_tag, 32);
+
+        let fully_encoded: Vec<u8> = [&domain_tag, encoded_payload].concat();
+        let mut addr = hex::decode(signer.address.clone()).unwrap();
+        padding(&mut addr, 8);
+
+        payload.push(TransactionSignature {
+            address: addr,
+            key_id: signer.key_id,
+            signature: sign(fully_encoded, signer.private_key.clone())?,
+        });
+    }
+    // for each of the envelope private keys, sign the transaction
+    for signer in envelope_signatures {
+        let encoded_payload: &[u8] =
+            &envelope_from_transaction(built_transaction.clone(), &payload);
+        let mut domain_tag: Vec<u8> = b"FLOW-V0.0-transaction".to_vec();
+        // we need to pad 0s at the end of the domain_tag
+        padding(&mut domain_tag, 32);
+
+        let fully_encoded: Vec<u8> = [&domain_tag, encoded_payload].concat();
+        let mut addr = hex::decode(signer.address.clone()).unwrap();
+        padding(&mut addr, 8);
+
+        envelope.push(TransactionSignature {
+            address: addr,
+            key_id: signer.key_id,
+            signature: sign(fully_encoded, signer.private_key.clone())?,
+        });
+    }
+    let signed_transaction = Some(Transaction {
+        script: built_transaction.script,
+        arguments: built_transaction.arguments,
+        reference_block_id: built_transaction.reference_block_id,
+        gas_limit: built_transaction.gas_limit,
+        proposal_key: built_transaction.proposal_key,
+        authorizers: built_transaction.authorizers,
+        payload_signatures: payload,
+        envelope_signatures: envelope,
+        payer: built_transaction.payer,
+    });
+    Ok(signed_transaction)
+}
+```
+
+You can see in the snippet above that both payload and envelope signatures are handled for the user in a manner that reduces the complexity and does not require an advanced understanding of RLP encoding.
+
+Authors include:
+
+    @marshallbelles
+    @bluesign

submissions/issue-20/milestone-3/flow-rust-sdk-team.md

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+##  Flow-Rust-SDK - Milestone 3
+
+This PR is for issue #20.
+
+
+### Milestone 3 Completion:
+- 3 [x] Meet and exceed Flow SDK guidelines
+
+The Flow SDK Guidelines are defined [here](https://github.com/onflow/sdks).
+
+Each of the provided stories have examples:
+
+Blocks:
+- [Retrieve a block by ID](https://github.com/MarshallBelles/flow-rust-sdk/wiki/Retrieve-a-block-by-ID)
+- [Retrieve a block by height](https://github.com/MarshallBelles/flow-rust-sdk/wiki/Retrieve-a-block-by-height)
+- [Retrieve the latest block](https://github.com/MarshallBelles/flow-rust-sdk/wiki/Retrieve-the-latest-block)
+
+Collections:
+- [Retrieve a collection by ID](https://github.com/MarshallBelles/flow-rust-sdk/wiki/Retrieve-a-collection-by-ID)
+
+Events:
+- [Retrieve events by name in the block height range](https://github.com/MarshallBelles/flow-rust-sdk/wiki/Retrieve-events-by-name-in-the-block-height-range)
+
+Scripts:
+- [Submit a script and parse the response](https://github.com/MarshallBelles/flow-rust-sdk/wiki/Submit-a-script-and-parse-the-response)
+- [Submit a script with arguments and parse the response](https://github.com/MarshallBelles/flow-rust-sdk/wiki/Submit-a-script-with-arguments-and-parse-the-response)
+
+Accounts:
+- [Retrieve an account by address](https://github.com/MarshallBelles/flow-rust-sdk/wiki/Retrieve-an-account-by-address)
+- [Create a new account](https://github.com/MarshallBelles/flow-rust-sdk/wiki/Create-a-new-account)
+- [Deploy a new contract to the account](https://github.com/MarshallBelles/flow-rust-sdk/wiki/Deploy-a-new-contract-to-the-account)
+- [Remove a contract from the account](https://github.com/MarshallBelles/flow-rust-sdk/wiki/Remove-a-contract-from-the-account)
+- [Update an existing contract on the account](https://github.com/MarshallBelles/flow-rust-sdk/wiki/Update-an-existing-contract-on-the-account)
+
+Transactions:
+- [Retrieve a transaction by ID](https://github.com/MarshallBelles/flow-rust-sdk/wiki/Transactions)
+- [Sign a transaction (single payer, proposer, authorizer or combination of multiple)](https://github.com/MarshallBelles/flow-rust-sdk/wiki/Transactions)
+- [Submit a signed transaction](https://github.com/MarshallBelles/flow-rust-sdk/wiki/Transactions)
+- [Sign a transaction with arguments and submit it](https://github.com/MarshallBelles/flow-rust-sdk/wiki/Transactions)
+
+Authors include:
+
+    @marshallbelles
+    @bluesign

submissions/issue-20/milestone-4/flow-rust-sdk-team.md

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+##  Flow-Rust-SDK - Milestone 4 [WIP]
+
+This PR is for issue #20.
+
+
+### Milestone 4 Completion:
+- 4 [ ] Complete documentation and common usage examples are available
+
+This is a WIP.
+
+Authors include:
+
+    @marshallbelles
+    @bluesign