keyforkd: initial commit

Cargo.lock

@@ -2,6 +2,45 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "addr2line"
+version = "0.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8a30b2e23b9e17a9f90641c7ab1549cd9b44f296d3ccbf309d2863cfe398a0cb"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6748e8def348ed4d14996fa801f4122cd763fff530258cdc03f64b25f89d3a5a"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "backtrace"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2089b7e3f35b9dd2d0ed921ead4f6d318c27680d4a5bd167b3ee120edb105837"
+dependencies = [
+ "addr2line",
+ "cc",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+]
+
 [[package]]
 name = "bip39"
 version = "2.0.0"
@@ -19,6 +58,12 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "90064b8dee6815a6470d60bad07bbbaee885c0e12d04177138fa3291a01b7bc4"
 
+[[package]]
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+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -28,6 +73,21 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "bytes"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "89b2fd2a0dcf38d7971e2194b6b6eebab45ae01067456a7fd93d5547a61b70be"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1174fb0b6ec23863f8b971027804a42614e347eafb0a95bf0b12cdae21fc4d0"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -43,7 +103,7 @@ dependencies = [
  "encode_unicode",
  "lazy_static",
  "libc",
- "windows-sys",
+ "windows-sys 0.45.0",
 ]
 
 [[package]]
@@ -75,12 +135,57 @@ dependencies = [
  "crypto-common",
 ]
 
+[[package]]
+name = "dirs"
+version = "5.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44c45a9d03d6676652bcb5e724c7e988de1acad23a711b5217ab9cbecbec2225"
+dependencies = [
+ "dirs-sys",
+]
+
+[[package]]
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+checksum = "520f05a5cbd335fae5a99ff7a6ab8627577660ee5cfd6a94a6a929b52ff0321c"
+dependencies = [
+ "libc",
+ "option-ext",
+ "redox_users",
+ "windows-sys 0.48.0",
+]
+
 [[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
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+[[package]]
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+
+[[package]]
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+
+[[package]]
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+dependencies = [
+ "futures-core",
+ "futures-task",
+ "pin-project-lite",
+ "pin-utils",
+]
+
 [[package]]
 name = "generic-array"
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@@ -91,6 +196,29 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "getrandom"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6fb8d784f27acf97159b40fc4db5ecd8aa23b9ad5ef69cdd136d3bc80665f0c0"
+
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+checksum = "443144c8cdadd93ebf52ddb4056d257f5b52c04d3c804e657d19eb73fc33668b"
+
 [[package]]
 name = "hex"
 version = "0.4.3"
@@ -124,6 +252,7 @@ dependencies = [
  "insta",
  "sha2",
  "thiserror",
+ "tokio",
 ]
 
 [[package]]
@@ -146,6 +275,18 @@ dependencies = [
 [[package]]
 name = "keyforkd"
 version = "0.1.0"
+dependencies = [
+ "dirs",
+ "keyfork-frame",
+ "keyfork-mnemonic-util",
+ "minicbor",
+ "thiserror",
+ "tokio",
+ "tower",
+ "tracing",
+ "tracing-error",
+ "tracing-subscriber",
+]
 
 [[package]]
 name = "lazy_static"
@@ -165,6 +306,146 @@ version = "0.5.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0717cef1bc8b636c6e1c1bbdefc09e6322da8a9321966e8928ef80d20f7f770f"
 
+[[package]]
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+checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
+
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+dependencies = [
+ "regex-automata 0.1.10",
+]
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+dependencies = [
+ "pin-project-internal",
+]
+
+[[package]]
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.29",
+]
+
+[[package]]
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+
 [[package]]
 name = "proc-macro2"
 version = "1.0.66"
@@ -183,6 +464,76 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "redox_syscall"
+version = "0.2.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fb5a58c1855b4b6819d59012155603f0b22ad30cad752600aadfcb695265519a"
+dependencies = [
+ "bitflags",
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+dependencies = [
+ "getrandom",
+ "redox_syscall",
+ "thiserror",
+]
+
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+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata 0.3.6",
+ "regex-syntax 0.7.4",
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+dependencies = [
+ "regex-syntax 0.6.29",
+]
+
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+checksum = "fed1ceff11a1dddaee50c9dc8e4938bd106e9d89ae372f192311e7da498e3b69"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax 0.7.4",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e5ea92a5b6195c6ef2a0295ea818b312502c6fc94dde986c5553242e18fd4ce2"
+
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+
 [[package]]
 name = "ryu"
 version = "1.0.15"
@@ -217,12 +568,57 @@ dependencies = [
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 ]
 
+[[package]]
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+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "900fba806f70c630b0a382d0d825e17a0f19fcd059a2ade1ff237bcddf446b31"
+dependencies = [
+ "lazy_static",
+]
+
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+checksum = "d8229b473baa5980ac72ef434c4415e70c4b5e71b423043adb4ba059f89c99a1"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "similar"
 version = "2.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "420acb44afdae038210c99e69aae24109f32f15500aa708e81d46c9f29d55fcf"
 
+[[package]]
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+dependencies = [
+ "libc",
+ "windows-sys 0.48.0",
+]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
 [[package]]
 name = "syn"
 version = "2.0.29"
@@ -251,7 +647,17 @@ checksum = "6bb623b56e39ab7dcd4b1b98bb6c8f8d907ed255b18de254088016b27a8ee19b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.29",
+]
+
+[[package]]
+name = "thread_local"
+version = "1.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "cfg-if",
+ "once_cell",
 ]
 
 [[package]]
@@ -269,6 +675,137 @@ version = "0.1.1"
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 checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
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+ "libc",
+ "mio",
+ "num_cpus",
+ "pin-project-lite",
+ "signal-hook-registry",
+ "socket2",
+ "tokio-macros",
+ "tracing",
+ "windows-sys 0.48.0",
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+[[package]]
+name = "tracing-subscriber"
+version = "0.3.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "30a651bc37f915e81f087d86e62a18eec5f79550c7faff886f7090b4ea757c77"
+dependencies = [
+ "matchers",
+ "nu-ansi-term",
+ "once_cell",
+ "regex",
+ "sharded-slab",
+ "smallvec",
+ "thread_local",
+ "tracing",
+ "tracing-core",
+ "tracing-log",
+]
+
 [[package]]
 name = "typenum"
 version = "1.16.0"
@@ -290,19 +827,62 @@ dependencies = [
  "tinyvec",
 ]
 
+[[package]]
+name = "valuable"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "830b7e5d4d90034032940e4ace0d9a9a057e7a45cd94e6c007832e39edb82f6d"
+
 [[package]]
 name = "version_check"
 version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
 [[package]]
 name = "windows-sys"
 version = "0.45.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "75283be5efb2831d37ea142365f009c02ec203cd29a3ebecbc093d52315b66d0"
 dependencies = [
- "windows-targets",
+ "windows-targets 0.42.2",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
+dependencies = [
+ "windows-targets 0.48.5",
 ]
 
 [[package]]
@@ -311,13 +891,28 @@ version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e5180c00cd44c9b1c88adb3693291f1cd93605ded80c250a75d472756b4d071"
 dependencies = [
- "windows_aarch64_gnullvm",
- "windows_aarch64_msvc",
- "windows_i686_gnu",
- "windows_i686_msvc",
- "windows_x86_64_gnu",
- "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
+ "windows_aarch64_gnullvm 0.42.2",
+ "windows_aarch64_msvc 0.42.2",
+ "windows_i686_gnu 0.42.2",
+ "windows_i686_msvc 0.42.2",
+ "windows_x86_64_gnu 0.42.2",
+ "windows_x86_64_gnullvm 0.42.2",
+ "windows_x86_64_msvc 0.42.2",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
+dependencies = [
+ "windows_aarch64_gnullvm 0.48.5",
+ "windows_aarch64_msvc 0.48.5",
+ "windows_i686_gnu 0.48.5",
+ "windows_i686_msvc 0.48.5",
+ "windows_x86_64_gnu 0.48.5",
+ "windows_x86_64_gnullvm 0.48.5",
+ "windows_x86_64_msvc 0.48.5",
 ]
 
 [[package]]
@@ -326,42 +921,84 @@ version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "597a5118570b68bc08d8d59125332c54f1ba9d9adeedeef5b99b02ba2b0698f8"
 
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b38e32f0abccf9987a4e3079dfb67dcd799fb61361e53e2882c3cbaf0d905d8"
+
 [[package]]
 name = "windows_aarch64_msvc"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e08e8864a60f06ef0d0ff4ba04124db8b0fb3be5776a5cd47641e942e58c4d43"
 
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc35310971f3b2dbbf3f0690a219f40e2d9afcf64f9ab7cc1be722937c26b4bc"
+
 [[package]]
 name = "windows_i686_gnu"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
 
+[[package]]
+name = "windows_i686_gnu"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
+
 [[package]]
 name = "windows_i686_msvc"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "44d840b6ec649f480a41c8d80f9c65108b92d89345dd94027bfe06ac444d1060"
 
+[[package]]
+name = "windows_i686_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
+
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8de912b8b8feb55c064867cf047dda097f92d51efad5b491dfb98f6bbb70cb36"
 
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
+
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
 
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
+
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.42.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
 
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
 [[package]]
 name = "yaml-rust"
 version = "0.4.5"

Cargo.toml

@@ -3,5 +3,6 @@
 members = [
     "keyfork-mnemonic-generate",
     "keyfork-mnemonic-util",
+    "keyforkd",
     "keyfork-frame"
 ]

keyfork-frame/Cargo.toml

@@ -5,10 +5,15 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[features]
+default = ["async"]
+async = ["dep:tokio"]
+
 [dependencies]
 hex = "0.4.3"
 sha2 = "0.10.7"
 thiserror = "1.0.47"
+tokio = { version = "1.32.0", optional = true, features = ["io-util"] }
 
 [dev-dependencies]
 insta = "1.31.0"

keyfork-frame/src/asyncext.rs

@@ -0,0 +1,45 @@
+use std::marker::Unpin;
+use tokio::io::{AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt};
+
+use super::{hash, verify_checksum, DecodeError, EncodeError};
+
+/// Decode a framed message into a `Vec<u8>`.
+///
+/// # Errors
+/// An error may be returned if:
+/// * The given `data` does not contain enough data to parse a length,
+/// * The given `data` does not contain the given length's worth of data,
+/// * The given `data` has a checksum that does not match what we build locally.
+pub async fn try_decode_from(
+    readable: &mut (impl AsyncRead + Unpin),
+) -> Result<Vec<u8>, DecodeError> {
+    let len = readable.read_u32().await?;
+
+    let mut data = Vec::with_capacity(len as usize);
+    readable.read_exact(&mut data[..]).await?;
+
+    let content = verify_checksum(&data[..])?;
+
+    // Note: Optimizing this isn't *too* practical, we could probably pop the first 32 bytes off
+    // the front of the Vec, but it might not even be worth it as opposed to one reallocation.
+    Ok(content.to_vec())
+}
+
+/// Encode a &[u8] into a framed message
+///
+/// # Errors
+/// An error may be returned if:
+/// * The given `data` is more than [`u32::MAX`] bytes. This is a constraint on a protocol level.
+/// * The resulting data was unable to be written to the given `writable`.
+pub async fn try_encode_to(
+    data: &[u8],
+    writable: &mut (impl AsyncWrite + Unpin),
+) -> Result<(), EncodeError> {
+    let hash = hash(data);
+    let len = u32::try_from(hash.len() + data.len())
+        .map_err(|_| EncodeError::InputTooLarge(hash.len() + data.len()))?;
+    writable.write_u32(len).await?;
+    writable.write_all(&hash[..]).await?;
+    writable.write_all(data).await?;
+    Ok(())
+}

keyfork-frame/src/lib.rs

@@ -12,10 +12,12 @@
 //! | checksum: [u8; 32] sha256 hash of `raw_data` | raw_data: &[u8] |
 //! ```
 
+#[cfg(feature = "async")]
+pub mod asyncext;
 
 use sha2::{Digest, Sha256};
 
-#[derive(Debug, Clone, thiserror::Error)]
+#[derive(Debug, thiserror::Error)]
 pub enum DecodeError {
     /// There were not enough bytes to determine the length of the data slice.
     #[error("Invalid length: {0}")]
@@ -32,18 +34,26 @@ pub enum DecodeError {
     /// The provided checksum of the data did not match the locally-generated checksum.
     #[error("Checksum did not match: Their {0} != Our {1}")]
     BadChecksum(String, String),
+
+    /// Data could not be read from the input source.
+    #[error("Data could not be read from the input source: {0}")]
+    Io(#[from] std::io::Error),
 }
 
-#[derive(Debug, Clone, thiserror::Error)]
+#[derive(Debug, thiserror::Error)]
 pub enum EncodeError {
     /// The given input was larger than could be encoded by this protocol.
     #[error("Input too large to encode: {0}")]
     InputTooLarge(usize),
+
+    /// Data could not be written to the output sink.
+    #[error("Data could not be written to the output sink: {0}")]
+    Io(#[from] std::io::Error),
 }
 
 const LEN_SIZE: usize = std::mem::size_of::<u32>();
 
-fn hash(data: &[u8]) -> Vec<u8> {
+pub(crate) fn hash(data: &[u8]) -> Vec<u8> {
     let mut hashobj = Sha256::new();
     hashobj.update(data);
     hashobj.finalize().to_vec()
@@ -65,6 +75,22 @@ pub fn try_encode(data: &[u8]) -> Result<Vec<u8>, EncodeError> {
     Ok(result)
 }
 
+pub(crate) fn verify_checksum(data: &[u8]) -> Result<&[u8], DecodeError> {
+    let checksum: &[u8; 32] = &data[..32]
+        .try_into()
+        .map_err(DecodeError::InvalidChecksum)?;
+
+    let content = &data[32..];
+    let our_checksum = hash(content);
+    if our_checksum != checksum {
+        return Err(DecodeError::BadChecksum(
+            hex::encode(checksum),
+            hex::encode(our_checksum),
+        ));
+    }
+    Ok(content)
+}
+
 /// Decode a framed message into a `Vec<u8>`.
 ///
 /// # Errors
@@ -83,18 +109,7 @@ pub fn try_decode(data: &[u8]) -> Result<Vec<u8>, DecodeError> {
     }
     let data = &data[LEN_SIZE..];
 
-    let checksum: &[u8; 32] = &data[..32]
-        .try_into()
-        .map_err(DecodeError::InvalidChecksum)?;
-
-    let content = &data[32..];
-    let our_checksum = hash(content);
-    if our_checksum != checksum {
-        return Err(DecodeError::BadChecksum(
-            hex::encode(checksum),
-            hex::encode(our_checksum),
-        ));
-    }
+    let content = verify_checksum(data)?;
 
     Ok(content.to_vec())
 }

keyforkd/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "keyforkd"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[features]
+default = ["tracing", "multithread"]
+tracing = ["tower/tracing", "tokio/tracing", "dep:tracing", "dep:tracing-subscriber", "dep:tracing-error"]
+multithread = ["tokio/rt-multi-thread"]
+
+[dependencies]
+dirs = "5.0.1"
+keyfork-frame = { version = "0.1.0", path = "../keyfork-frame" }
+keyfork-mnemonic-util = { version = "0.1.0", path = "../keyfork-mnemonic-util" }
+minicbor = { version = "0.19.1", features = ["derive", "std"] }
+thiserror = "1.0.47"
+tokio = { version = "1.32.0", features = ["io-util", "macros", "rt", "io-std", "net", "fs", "signal"] }
+tower = { version = "0.4.13", features = ["tokio", "util"] }
+tracing = { version = "0.1.37", optional = true }
+tracing-error = { version = "0.2.0", optional = true }
+tracing-subscriber = { version = "0.3.17", optional = true, features = ["env-filter"] }

keyforkd/src/error.rs

@@ -0,0 +1,7 @@
+use thiserror::Error;
+
+#[derive(Debug, Clone, Error)]
+pub(crate) enum KeycloakdError {
+    #[error("No runtime directory found from dirs::runtime_dir()")]
+    NoRuntimeDir,
+}

keyforkd/src/main.rs

@@ -0,0 +1,72 @@
+use keyfork_mnemonic_util::Mnemonic;
+
+use tokio::io::{self, AsyncBufReadExt, BufReader};
+
+#[cfg(feature = "tracing")]
+use tracing::debug;
+#[cfg(feature = "tracing")]
+use tracing_subscriber::{
+    filter::{EnvFilter, LevelFilter},
+    fmt::{format::FmtSpan, layer},
+    prelude::*,
+    registry,
+};
+
+mod error;
+mod service;
+mod server;
+use error::KeycloakdError;
+use service::Keyforkd;
+use server::UnixServer;
+
+type Result<T, E = Box<dyn std::error::Error>> = std::result::Result<T, E>;
+
+async fn load_mnemonic() -> Result<Mnemonic> {
+    let mut stdin = BufReader::new(io::stdin());
+    let mut line = String::new();
+    stdin.read_line(&mut line).await?;
+    Ok(line.parse()?)
+}
+
+#[cfg(feature = "tracing")]
+fn setup_registry() {
+    let envfilter = EnvFilter::builder()
+        .with_default_directive(LevelFilter::DEBUG.into())
+        .from_env_lossy();
+    registry()
+        .with(envfilter)
+        .with(layer().with_span_events(FmtSpan::CLOSE))
+        .with(tracing_error::ErrorLayer::default())
+        .init();
+}
+
+#[cfg_attr(feature = "multithread", tokio::main)]
+#[cfg_attr(not(feature = "multithread"), tokio::main(flavor = "current_thread"))]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    #[cfg(feature = "tracing")]
+    setup_registry();
+
+    #[cfg(feature = "tracing")]
+    debug!("reading mnemonic from standard input");
+    let mnemonic = load_mnemonic().await?;
+
+    let service = Keyforkd::new(mnemonic);
+
+    let mut runtime_dir = dirs::runtime_dir().ok_or(KeycloakdError::NoRuntimeDir)?;
+    runtime_dir.push("keyforkd");
+    #[cfg(feature = "tracing")]
+    debug!("ensuring directory exists: {}", runtime_dir.display());
+    if !runtime_dir.is_dir() {
+        tokio::fs::create_dir(&runtime_dir).await?;
+    }
+    runtime_dir.push("keyforkd.sock");
+    #[cfg(feature = "tracing")]
+    debug!(
+        "binding UNIX socket in runtime dir: {}",
+        runtime_dir.display()
+    );
+
+    let mut server = UnixServer::bind(&runtime_dir)?;
+    let _ = server.run(service).await;
+    Ok(())
+}

keyforkd/src/server.rs

@@ -0,0 +1,93 @@
+use crate::service::{DerivablePath, DerivationError, Keyforkd};
+use keyfork_frame::asyncext::{try_decode_from, try_encode_to};
+use std::{io::Error, path::{Path, PathBuf}};
+use tokio::net::{UnixListener, UnixStream};
+use tower::{Service, ServiceExt};
+
+#[cfg(feature = "tracing")]
+use tracing::debug;
+
+async fn read_path_from_socket(
+    socket: &mut UnixStream,
+) -> Result<DerivablePath, Box<dyn std::error::Error + Send>> {
+    let data = try_decode_from(socket).await.unwrap();
+    let path: DerivablePath = minicbor::decode(&data[..]).unwrap();
+    Ok(path)
+}
+
+async fn wait_and_run(app: &mut Keyforkd, path: DerivablePath) -> Result<Vec<u8>, DerivationError> {
+    app.ready().await?.call(path).await
+}
+
+#[allow(clippy::module_name_repetitions)]
+pub struct UnixServer {
+    listener: UnixListener,
+}
+
+impl UnixServer {
+    pub fn bind(address: impl AsRef<Path>) -> Result<Self, Error> {
+        let mut path = PathBuf::new();
+        path.extend(address.as_ref().components());
+        tokio::spawn(async move {
+            let result = tokio::signal::ctrl_c().await;
+            #[cfg(feature = "tracing")]
+            debug!(?result, "encountered ctrl-c, performing cleanup and exiting");
+            let result = tokio::fs::remove_file(&path).await;
+            #[cfg(feature = "tracing")]
+            if let Err(error) = result {
+                debug!(%error, "unable to remove path: {}", path.display());
+            }
+            std::process::exit(0x80);
+        });
+
+        Ok(Self {
+            listener: UnixListener::bind(address)?,
+        })
+    }
+
+    pub async fn run(&mut self, app: Keyforkd) -> Result<(), Box<dyn std::error::Error>> {
+        loop {
+            let mut app = app.clone();
+            let (mut socket, _) = self.listener.accept().await?;
+            #[cfg(feature = "tracing")]
+            debug!("new socket connected");
+            tokio::spawn(async move {
+                let path = match read_path_from_socket(&mut socket).await {
+                    Ok(path) => path,
+                    Err(e) => {
+                        #[cfg(feature = "tracing")]
+                        debug!(%e, "Error reading DerivablePath from socket");
+                        let content = e.to_string().bytes().collect::<Vec<_>>();
+                        let result = try_encode_to(&content[..], &mut socket).await;
+                        #[cfg(feature = "tracing")]
+                        if let Err(error) = result {
+                            debug!(%error, "Error sending error to client");
+                        }
+                        return;
+                    }
+                };
+
+                let response = match wait_and_run(&mut app, path).await {
+                    Ok(response) => response,
+                    Err(e) => {
+                        #[cfg(feature = "tracing")]
+                        debug!(%e, "Error reading DerivablePath from socket");
+                        let content = e.to_string().bytes().collect::<Vec<_>>();
+                        let result = try_encode_to(&content[..], &mut socket).await;
+                        #[cfg(feature = "tracing")]
+                        if let Err(error) = result {
+                            debug!(%error, "Error sending error to client");
+                        }
+                        return;
+                    }
+                };
+
+                if let Err(e) = try_encode_to(&response[..], &mut socket).await {
+                    #[cfg(feature = "tracing")]
+                    debug!(%e, "Error sending response to client");
+                }
+
+            });
+        }
+    }
+}

keyforkd/src/service.rs

@@ -0,0 +1,66 @@
+use std::{future::Future, pin::Pin, task::Poll, sync::Arc};
+
+use keyfork_mnemonic_util::Mnemonic;
+use minicbor::{Decode, Encode};
+use tower::Service;
+use thiserror::Error;
+
+#[derive(Encode, Decode, Clone, Debug)]
+pub struct DerivablePath {
+    #[n(0)]
+    path: Vec<Vec<u8>>,
+}
+
+// TODO: move DerivablePath into a models crate for clients to produce?
+/*
+impl DerivablePath {
+    pub fn new(input: &[&[u8]]) -> DerivablePath {
+        DerivablePath {
+            path: input
+                .iter()
+                .map(|&word| {
+                    // perform path validation
+                    word.to_vec()
+                })
+                .collect(),
+        }
+    }
+}
+*/
+
+#[derive(Clone, Debug)]
+pub struct Keyforkd {
+    mnemonic: Arc<Mnemonic>,
+}
+
+// Currently, this can't be instantiated, therefore it is a never-type
+#[derive(Debug, Error)]
+pub enum DerivationError {
+}
+
+impl Keyforkd {
+    pub fn new(mnemonic: Mnemonic) -> Self {
+        Self { mnemonic: Arc::new(mnemonic) }
+    }
+}
+
+impl Service<DerivablePath> for Keyforkd {
+    type Response = Vec<u8>;
+
+    type Error = DerivationError;
+
+    type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send>>;
+
+    fn poll_ready(
+        &mut self,
+        _cx: &mut std::task::Context<'_>,
+    ) -> std::task::Poll<Result<(), Self::Error>> {
+        Poll::Ready(Ok(()))
+    }
+
+    #[cfg_attr(feature = "tracing", tracing::instrument(skip(self)))]
+    fn call(&mut self, req: DerivablePath) -> Self::Future {
+        dbg!(&req, &self.mnemonic);
+        Box::pin(async { Ok(vec![]) })
+    }
+}